CN112248359A - Manufacturing process of directional reflective film - Google Patents
Manufacturing process of directional reflective film Download PDFInfo
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- CN112248359A CN112248359A CN202011041956.8A CN202011041956A CN112248359A CN 112248359 A CN112248359 A CN 112248359A CN 202011041956 A CN202011041956 A CN 202011041956A CN 112248359 A CN112248359 A CN 112248359A
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Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/0001—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor characterised by the choice of material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/0053—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor combined with a final operation, e.g. shaping
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/2602—Mould construction elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
- B29C45/56—Means for plasticising or homogenising the moulding material or forcing it into the mould using mould parts movable during or after injection, e.g. injection-compression moulding
- B29C45/568—Applying vibrations to the mould parts
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/72—Heating or cooling
- B29C45/73—Heating or cooling of the mould
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/0053—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor combined with a final operation, e.g. shaping
- B29C2045/0079—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor combined with a final operation, e.g. shaping applying a coating or covering
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C2045/1486—Details, accessories and auxiliary operations
- B29C2045/14868—Pretreatment of the insert, e.g. etching, cleaning
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2067/00—Use of polyesters or derivatives thereof, as moulding material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2007/00—Flat articles, e.g. films or sheets
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2011/00—Optical elements, e.g. lenses, prisms
- B29L2011/0083—Reflectors
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Optical Elements Other Than Lenses (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
The invention relates to the technical field of reflective materials, in particular to a manufacturing process of a directional reflective film, which comprises the steps of die processing, die assembly injection molding, hot press forming and hardening coating, wherein a die carrier adopted comprises a support shell, a swing rod and a controller; the precision of the cube-corner surface is influenced by the mutual contact state of the cube-corner conical surfaces formed by the sheet combination, and the temperature change of the mold in the injection molding process needs to be accurately controlled, otherwise, the quality of the injection molded reflective film can be reduced; therefore, the process of the reflective film injection mold is controlled by the aid of the mold frame, the oscillating rod drives the support shell to vibrate, distribution states of polyester plastics in the mold cavity are balanced, flatness of the whole cube-corner cone of the sheet combination is kept, the support shell wraps the mold, temperature states of the mold are accurately controlled under the action of the support plate at the bottom of the mold, temperature adjusting requirements in reflective film manufacturing processes are met, and accordingly operation effects of a directional reflective film manufacturing process are improved.
Description
Technical Field
The invention relates to the technical field of reflective materials, in particular to a manufacturing process of a directional reflective film.
Background
Retroreflective sheeting (which is called retroreflective sheeting) is a thin film that reflects light or radiation back to a light source and is widely used in traffic signs and personal safety signs; the retroreflection unit in the reflecting film mainly has two structures of glass beads and cube-corner, wherein the cube-corner reflecting film is famous for high retroreflection efficiency, and the retroreflection coefficient of the cube-corner reflecting film to vertical incident light is 2 to 3 times higher than that of the glass beads, so that the development and application of the cube-corner reflecting film are more valued by people; for the introduction of the manufacturing process of the directional reflective film, refer to the optimized design [ J ] of reflective film structure based on the thin slice combination technology, such as Luohan, China laser 2015(No.2), 216-221.
The cube corner cone-shaped reflective film is characterized in that a reflective mold product is manufactured on a female mold with a micro-geometric structure on the surface by matching with a male mold, so that the quality of the female mold determines the quality of the manufactured reflective mold; in the existing female die processing technology, the contact state between the sheets of the cube-corner conical surface formed by combining the sheets after the sheets are installed on the female die influences the precision of the cube-corner conical surface, and the temperature change of the die in the injection molding process needs to be accurately controlled, otherwise, the quality of the injection molded reflective film can be reduced.
Some technical solutions related to the manufacturing process of the directional reflective film also appear in the prior art, for example, a chinese patent with application number 2014108233423 discloses a method for producing a microprism reflective film, which includes the following steps: a) coating the sealing layer resin adhesive on the base material film layer by adopting a coating and gluing mode, and drying and curing the base material film layer by adopting a step-by-step baking method to form a sealing layer, wherein the drying time is 10 to 20 minutes, the baking temperature is set to be 80 to 130 ℃, and the thickness of the dry adhesive is 20 to 40 micrometers; b) embossing and compounding the sealing layer and the pressed surface of the microprism formed reflective film layer at a high temperature by a press roller with an embossing pattern, wherein the temperature of the press roller is 170-250 ℃, the pressure is 3-5 kg, and the pressing speed is 3-6 m/min; c) and coating the pressure-sensitive adhesive on the strippable layer, drying, and compounding and molding the pressure-sensitive adhesive and the other surface of the base material film layer. The invention has simple production process and high production efficiency, and the product has the characteristics of high adhesion property, high weather resistance, high reflection brightness and the like, and has long service life and wide application range; but the technical proposal can not maintain the precision grade of the surface of the microprism structure formed by the combination of the sheets in the manufacturing process of the reflective film and the temperature change in the manufacturing process can not be effectively controlled.
In view of the above, in order to overcome the above technical problems, the present invention provides a manufacturing process of a directional reflective film, which adopts a special manufacturing process of a directional reflective film, thereby solving the above technical problems.
Disclosure of Invention
In order to make up for the defects of the prior art, the invention provides a manufacturing process of a directional reflective film, the working procedure process of a reflective film injection mold is controlled by an arranged mold frame, the vibration of a supporting shell is driven by a swing rod, the distribution state of polyester plastics in a mold cavity is balanced, the integral flatness of a cube-corner cone of a sheet combination is kept, the temperature state of the mold is accurately controlled under the action of a supporting plate at the bottom of the mold by utilizing the wrapping state of the supporting shell on the mold, the temperature regulation requirement in the reflective film manufacturing working procedure is met, and the operation effect of the manufacturing process of the directional reflective film is improved.
The invention relates to a manufacturing process of a directional reflecting film, which comprises the following steps:
s1, compression molding: processing a microstructure of a cubic pyramid on the end face of the sheet, carrying out surface treatment on the sheet by nickel electroforming, and controlling the thickness of the sheet to ensure that a single row of cubic pyramids are distributed on the end face of the sheet; the cube-corner plane formed by combining the slices replaces the high-precision requirement of integrally processing the cube-corner plane structure, and the processing process is convenient to implement;
s2, mold closing and injection molding: installing the sheets prepared in the step S1 into a female die to be mutually attached, then assembling a male die onto the female die, fixing the boxed die on a die frame, heating the die to the temperature of 210-240 ℃ through the die frame, injecting molten polyester plastic into a cavity of the die, controlling the injection molding process to be completed within 10-15S, and continuously increasing the die temperature in the injection molding process at the speed of 3-4 ℃/S; the gradually raised temperature of the mold in the injection molding process is controlled, so that the flow property of the molten polyester plastic in the mold cavity is maintained, the distribution state of the molten polyester plastic in the mold cavity is balanced, and the time consumed in the injection molding process is reduced;
s3, hot-press forming: after the injection molding process in S2 is finished, controlling the mold frame to continuously heat the mold to 20-40 ℃ and maintain for 3-5h, after the mold is naturally cooled to 220 ℃, starting a refrigerating sheet on the mold frame to actively cool the mold, reducing the temperature of the mold to below 90 ℃ within 30min, and then restoring the mold to a naturally cooled state to room temperature to obtain a prefabricated product of the reflective film; the secondary heating process of the mould after the injection molding is finished utilizes the thermal expansion effect of the polyester plastic to increase the acting force borne by the polyester plastic in the mould cavity, the active cooling process in the mould cavity reduces the time consumption of the process and stabilizes the shape of the homogeneous molten polyester plastic, and the natural cooling stage after the active cooling process carries out aging treatment on the internal stress in the polyester plastic to ensure the quality of the prefabricated product of the reflective film;
s4, hardening and coating: transferring the prefabricated reflecting film product in the step S3 to a curing chamber under the conditions of constant temperature and constant humidity for hardening treatment, coating a polycarbonate material on the surface of the cubic pyramid microstructure to form a layer of transparent matrix for protecting the reflecting film structure, and then coating an adhesive on the bottom surface of the reflecting film and adhering a cover; the effective service life of the reflective film is maintained by hardening and surface coating of the reflective film;
the die carrier in S2-S3 comprises a supporting shell, a swing rod and a controller; a female die is installed in the support shell, and a male die is arranged above the female die; swing rods are arranged on two sides of the support shell, supporting legs which are rotatably arranged are arranged on the outer sides of the swing rods, and driving motors are arranged on the supporting legs; a supporting plate is arranged in the supporting shell, the circumferential edge of the supporting plate is in sliding contact with the inner wall of the supporting shell, and a telescopic frame is arranged between the supporting shell and the supporting plate and connected with the supporting shell; the supporting plate moves between the bottom of the supporting shell and the position of the port under the control of the telescopic frame; the upper surface of the supporting plate is provided with intermittently arranged edge grooves, and the edge grooves are internally provided with refrigeration sheets; the bulges among the edge grooves on the supporting plate are provided with bosses, and electromagnetic heating rings are arranged in the bosses; the controller is used for adjusting the operation of the die carrier; when the device is used, the support plate is jacked to the port of the support shell by the telescopic frame by the starting controller, then the female die is placed on the support plate and is lowered to the bottom of the support shell, and the male die is installed on the female die in the support shell; therefore, the swing rods arranged on the two sides of the support shell are matched with the swing rods to rotate the installed support legs, after the female die is placed in the support shell, the support shell is driven by the motor to swing through the controller, so that the thin slices in the female die are subjected to reciprocating action to generate mutual vibration, the tight fit state among the thin slices is enhanced, and the electromagnetic heating ring arranged in the boss and the refrigerating sheets arranged in the edge grooves provide balanced heating and cooling effects for the installed female die, so that the temperature of the die is controlled; the invention utilizes the arranged die carrier to control the process of the reflective film injection die, drives the vibration of the supporting shell through the oscillating bar, balances the distribution state of the polyester plastic in the die cavity, keeps the integral planeness of the cube-corner cone of the sheet combination, and utilizes the wrapping state of the supporting shell to the die to accurately control the temperature state of the die under the action of the supporting plate at the bottom of the die, thereby meeting the temperature regulation requirement in the reflective film manufacturing process and further improving the operation effect of the directional reflective film manufacturing process.
Preferably, the bottom of the support shell is provided with a shallow groove; the bottom of the supporting plate is provided with an embedded groove, and the embedded groove corresponds to the shallow groove in position; the end part of the telescopic frame is provided with a hinged sliding block which is respectively arranged in the shallow groove and the caulking groove; a driving oil cylinder is arranged between the sliding block and the end part of the shallow groove; the telescopic frame in the supporting shell is used for driving the supporting plate to lift, and the mutual contact state of the supporting plate when the supporting plate is lowered to the bottom of the supporting shell needs to be controlled so as to ensure that the vibration effect of the supporting shell is completely transmitted to the die on the supporting plate and reduce the volume required by the supporting shell for wrapping the die; through shallow slot and caulking groove that set up respectively on support shell and layer board for the expansion bracket is in the space that shallow slot and caulking groove formed after the shrink, ensures the laminating state each other between layer board and support shell, and through articulated slider on the expansion bracket, satisfies the drive that bears mould weight on the layer board through the control of hydro-cylinder to the expansion bracket, thereby has promoted the operation effect of directional reflective membrane preparation technology.
Preferably, a surrounding through hole is further formed in the circumferential direction of the support shell, and the through hole corresponds to the end part of the edge groove on the supporting plate; the supporting plate is lifted by the oil cylinder through the telescopic frame under the action of the controller, so that the edge grooves are communicated with the through holes; in the cooling process in the reflective film process, the support shell, the support plate and the die need to be matched with each other to effectively control the temperature and ensure the quality of the reflective film in the manufacturing process; according to the invention, through the through holes arranged on the support shell in a surrounding manner, in the cooling process of the die, the positions of the edge grooves and the through holes are communicated by moving the position of the supporting plate, so that heat generated by the edge grooves in the cooling process of the die is discharged through the through holes in the support shell, the heat dissipation capacity of the die is enhanced, the purpose of rapidly cooling in the working procedure is achieved, and the operation effect of the manufacturing process of the directional reflective film is improved.
Preferably, a sliding rod and a truss are arranged at the joint of the supporting shell and the swinging rod; the sliding rod is fixed on the outer wall of the support shell, and the length direction of the sliding rod is positioned on a horizontal plane; the truss is in sliding contact with the sliding rod and is rotatably arranged at the bottom of the oscillating bar; in the manufacturing process of the reflective film, the oscillating bar drives the support shell to oscillate, so that the vibration of the die is in an inclined direction, the bonding state between the sheets assembled and installed in the die is influenced, and the manufacturing quality of the reflective film is further interfered; according to the invention, the sliding rod arranged on the outer wall of the support shell is matched with the truss at the lower end of the swinging rod, so that the swinging action of the swinging rod is converted into the movement of the sliding rod on the horizontal plane of the truss, and further, the vibration action on the die arranged in the support shell is in the horizontal direction, and the joint state between the combined installation sheets in the die is ensured, thereby maintaining the operation effect of the manufacturing process of the directional reflective film.
Preferably, the end part of the sliding rod is provided with a convex end head, and the end head is provided with a spring towards the truss; one end of the spring is fixed on the end head, and the other end of the spring is provided with a bearing plate contacting with the end part of the truss; in the sliding process between the truss and the sliding rod, the movement direction needs to be changed by overcoming the action of inertia force at the moment of reciprocating movement, so that potential energy waste caused by the movement of the supporting shell driven by the oscillating bar is caused; according to the invention, the spring arranged on the end of the protrusion of the sliding rod transmits the inertia acting force of the truss to the deformation of the spring at the end point of the change of the sliding direction of the truss for storage, and releases the potential energy stored in the spring at the moment of the detachment of the truss in the direction-changing movement, so that the moving speed of the truss on the sliding rod is maintained, and the enough vibration effect is provided for the supporting shell, and the bearing plate arranged on the spring enables the acting force on the truss to be balanced on a plane, thereby improving the operation effect of the manufacturing process of the directional reflective film.
Preferably, the end part of the spring is also provided with a support rod, the support rod is arranged on the end head, and the support rod changes the extension amount of the spring on the end head under the regulation of the controller; in the manufacturing process of the reflective membrane, the reflective membrane with the corresponding cube-corner microstructure is manufactured by changing the slices with different models, so that the vibration effect of the supporting shell needs to be correspondingly changed, the combination fit state among the slices is promoted, after the operation power of the motor is adjusted, the interaction state between the truss and the sliding rod needs to be correspondingly changed, and the adjustment effect on the vibration state of the supporting shell is jointly improved; according to the invention, the support rod arranged on the end head is utilized to control the extension amount of the spring by changing the position of the support rod on the end head, so that the sliding stroke of the truss is adjusted, and the operation effect of the manufacturing process of the directional reflective film is improved.
The invention has the following beneficial effects:
1. the process of the reflective film injection mold is controlled by the arranged mold frame, the distribution state of the polyester plastic in the mold cavity is balanced, and the temperature state of the polyester plastic is accurately controlled; shallow grooves and embedded grooves arranged on the support shell and the supporting plate ensure the mutual fit state between the supporting plate and the support shell; the through holes are arranged on the supporting shell in a surrounding mode, so that heat generated by the edge grooves in the mold cooling process is discharged through the through holes in the supporting shell, and the heat dissipation capacity of the mold is enhanced.
2. According to the invention, the sliding rod arranged on the outer wall of the supporting shell is matched with the truss at the lower end of the swing rod, so that the swinging action of the swing rod is converted into the movement of the sliding rod on the horizontal plane of the truss, and the joint state between the combined installation sheets in the die is ensured; the spring is arranged at the end of the bulge of the sliding rod and used for maintaining the moving speed of the truss on the sliding rod; the supporting rod arranged on the end head controls the extending amount of the spring by utilizing the position change of the supporting rod on the end head, and the sliding stroke of the truss is adjusted.
Drawings
The invention is further described with reference to the following figures and embodiments.
FIG. 1 is a flow chart of a process for making a retroreflective sheeting of the present invention;
figure 2 is an exploded top view of the formwork of the present invention;
FIG. 3 is an exploded bottom view of the formwork of the present invention;
FIG. 4 is an enlarged view of a portion of FIG. 2 at A;
FIG. 5 is an enlarged view of a portion of FIG. 2 at B;
in the figure: the support comprises a support shell 1, a female die 11, a male die 12, a shallow groove 13, a through hole 14, a swing rod 2, a supporting leg 3, a motor 31, a supporting plate 4, a ridge groove 41, a boss 42, an embedded groove 43, a telescopic frame 5, a sliding block 51, an oil cylinder 52, a sliding rod 6, a tip 61, a spring 62, a bearing plate 63, a supporting rod 64 and a truss 7.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
As shown in fig. 1 to 5, the manufacturing process of the directional reflecting film according to the present invention includes the following steps:
s1, compression molding: processing a microstructure of a cubic pyramid on the end face of the sheet, carrying out surface treatment on the sheet by nickel electroforming, and controlling the thickness of the sheet to ensure that a single row of cubic pyramids are distributed on the end face of the sheet; the cube-corner plane formed by combining the slices replaces the high-precision requirement of integrally processing the cube-corner plane structure, and the processing process is convenient to implement;
s2, mold closing and injection molding: installing the sheets prepared in the step S1 into the female die 11 to be mutually attached, then assembling the male die 12 onto the female die 11, fixing the boxed die on a die frame, heating the die to 240 ℃ through the die frame, injecting molten polyester plastic into a cavity of the die, controlling the injection molding process to be completed within 10-15S, and continuously increasing the die temperature in the injection molding process at the speed of 3-4 ℃/S; the gradually raised temperature of the mold in the injection molding process is controlled, so that the flow property of the molten polyester plastic in the mold cavity is maintained, the distribution state of the molten polyester plastic in the mold cavity is balanced, and the time consumed in the injection molding process is reduced;
s3, hot-press forming: after the injection molding process in S2 is finished, controlling the mold frame to continuously heat the mold to 20-40 ℃ and maintain for 3-5h, after the mold is naturally cooled to 220 ℃, starting a refrigerating sheet on the mold frame to actively cool the mold, reducing the temperature of the mold to below 90 ℃ within 30min, and then restoring the mold to a naturally cooled state to room temperature to obtain a prefabricated product of the reflective film; the secondary heating process of the mould after the injection molding is finished utilizes the thermal expansion effect of the polyester plastic to increase the acting force borne by the polyester plastic in the mould cavity, the active cooling process in the mould cavity reduces the time consumption of the process and stabilizes the shape of the homogeneous molten polyester plastic, and the natural cooling stage after the active cooling process carries out aging treatment on the internal stress in the polyester plastic to ensure the quality of the prefabricated product of the reflective film;
s4, hardening and coating: transferring the prefabricated reflecting film product in the step S3 to a curing chamber under the conditions of constant temperature and constant humidity for hardening treatment, coating a polycarbonate material on the surface of the cubic pyramid microstructure to form a layer of transparent matrix for protecting the reflecting film structure, and then coating an adhesive on the bottom surface of the reflecting film and adhering a cover; the effective service life of the reflective film is maintained by hardening and surface coating of the reflective film;
the die carrier in S2-S3 comprises a supporting shell 1, a swing rod 2 and a controller; a female die 11 is installed in the support shell 1, and a male die 12 is arranged above the female die 11; swing rods 2 are arranged on two sides of the support shell 1, supporting legs 3 which are rotatably arranged are arranged on the outer sides of the swing rods 2, and driving motors 31 are arranged on the supporting legs 3; a supporting plate 4 is arranged in the supporting shell 1, the circumferential edge of the supporting plate 4 is in sliding contact with the inner wall of the supporting shell 1, and a telescopic frame 5 is arranged between the supporting shell 1 and the supporting plate 4 and connected with each other; the supporting plate 4 moves between the bottom of the supporting shell 1 and the position of the port under the control of the telescopic frame 5; the upper surface of the supporting plate 4 is provided with intermittently arranged edge grooves 41, and refrigerating sheets are arranged in the edge grooves 41; the bulges among the edge grooves 41 on the supporting plate 4 are arranged as bosses 42, and electromagnetic heating rings are arranged in the bosses 42; the controller is used for adjusting the operation of the die carrier; when the device is used, the controller is started to jack the supporting plate 4 to the port of the supporting shell 1 through the telescopic frame 5, then the female die 11 is placed on the supporting plate 4 and is lowered to the bottom of the supporting shell 1, the male die 12 is installed on the female die 11 in the supporting shell 1, due to the cubic pyramid plane formed by combining the sheets, after the female die 11 is installed, the mutual contact state of the sheets affects the precision of the cubic pyramid, and the temperature change of the die in the injection molding process needs to be accurately controlled, otherwise, the quality of the injection molded reflective film can be reduced; therefore, according to the invention, the swing rods 2 arranged at two sides of the support shell 1 are matched with the swing rods 2 to rotate the installed support legs 3, after the female die 11 is placed in the support shell 1, the motor 31 drives the support shell 1 to swing through the controller, so that the thin sheets in the female die 11 are subjected to reciprocating action to generate mutual vibration, the tight fit state among the thin sheets is enhanced, and the electromagnetic heating ring arranged in the boss 42 and the refrigerating sheets in the edge groove 41 provide balanced heating and cooling effects for the installed female die 11, thereby achieving the temperature control of the die; the invention utilizes the arranged die carrier to control the process of the reflective film injection die, drives the support shell 1 to vibrate through the oscillating bar 2, balances the distribution state of the polyester plastic in the die cavity, keeps the integral planeness of the cube-corner cone of the sheet combination, and utilizes the wrapping state of the support shell 1 to the die to accurately control the temperature state of the die under the action of the supporting plate 4 at the bottom of the die, thereby meeting the temperature regulation requirement in the reflective film manufacturing process and further improving the operation effect of the directional reflective film manufacturing process.
As an embodiment of the invention, the bottom of the supporting shell 1 is provided with a shallow groove 13; the bottom of the supporting plate 4 is provided with a caulking groove 43, and the position of the caulking groove 43 corresponds to that of the shallow groove 13; the end part of the telescopic frame 5 is provided with a hinged sliding block 51, and the sliding block 51 is respectively arranged in the shallow groove 13 and the caulking groove 43; a driving oil cylinder 52 is also arranged between the slide block 51 and the end part of the shallow groove 13; the telescopic frame 5 in the support shell 1 is used for driving the supporting plate 4 to lift, and the mutual contact state between the supporting plate 4 and the supporting plate 4 when the supporting plate 4 is lowered to the bottom of the support shell 1 needs to be controlled, so that the vibration effect of the support shell 1 is completely transmitted to a mould on the supporting plate 4, and the volume required by the support shell 1 for wrapping the mould is reduced; through shallow slot 13 and caulking groove 43 that set up respectively on holding in the palm shell 1 and layer board 4 for the expansion bracket 5 is in the space that shallow slot 13 and caulking groove 43 formed after the shrink, ensures the laminating state each other between layer board 4 and the support shell 1, and through articulated slider 51 on the expansion bracket 5, satisfies the drive to bearing the weight of the mould on the layer board 4 through the control of hydro-cylinder 52 to expansion bracket 5, thereby has promoted the operational effect of directional reflective membrane manufacturing process.
As an embodiment of the invention, a circumferential through hole 14 is further arranged on the supporting shell 1 in the circumferential direction, and the through hole 14 corresponds to the end position of the edge groove 41 on the supporting plate 4; the oil cylinder 52 lifts the supporting plate 4 through the telescopic frame 5 under the action of the controller, so that the edge groove 41 is communicated with the through hole 14; in the cooling process in the reflective film process, the support shell 1, the support plate 4 and the die need to be matched with each other to effectively control the temperature and ensure the quality of the reflective film in the manufacturing process; according to the invention, through the through holes 14 arranged on the supporting shell 1 in a surrounding manner, in the cooling process of the die, the positions of the edge grooves 41 and the through holes 14 are communicated by moving the position of the supporting plate 4, so that the heat of the edge grooves 41 in the cooling process of the die is discharged through the through holes 14 in the supporting shell 1, the heat dissipation capacity of the die is enhanced, the rapid cooling purpose in the process is achieved, and the operation effect of the manufacturing process of the directional reflective film is improved.
As an embodiment of the invention, a sliding rod 6 and a truss 7 are arranged at the joint of the supporting shell 1 and the swing rod 2; the sliding rod 6 is fixed on the outer wall of the support shell 1, and the length direction of the sliding rod is on the horizontal plane; the truss 7 is in sliding contact with the sliding rod 6, and the truss 7 is rotatably arranged at the bottom of the oscillating bar 2; in the manufacturing process of the reflective film, the oscillating bar 2 drives the support shell 1 to oscillate, so that the vibration of the die is in an inclined direction, the bonding state between the sheets assembled and installed in the die is influenced, and the manufacturing quality of the reflective film is further interfered; according to the invention, the sliding rod 6 arranged on the outer wall of the support shell 1 is matched with the truss 7 at the lower end of the swinging rod 2, so that the swinging action of the swinging rod 2 is converted into the movement of the sliding rod 6 on the horizontal plane of the truss 7, and further, the vibration effect on the die arranged in the support shell 1 is in the horizontal direction, and the bonding state between the combined installation sheets in the die is ensured, thereby maintaining the operation effect of the manufacturing process of the directional reflective film.
As an embodiment of the present invention, the end of the sliding rod 6 is provided with a convex end 61, and the end 61 is provided with a spring 62 facing the truss 7; one end of the spring 62 is fixed on the end 61, and the other end of the spring 62 is provided with a bearing plate 63 contacting the end of the truss 7; in the sliding process between the truss 7 and the sliding rod 6, the direction of movement needs to be changed by overcoming the action of inertia force at the moment of reciprocating movement, so that potential energy waste caused by the fact that the oscillating rod 2 drives the supporting shell 1 to move is caused; according to the invention, the spring 62 arranged on the protruding end 61 of the sliding rod 6 transmits the inertia acting force to the deformation of the spring 62 at the end point of the change of the sliding direction of the truss 7 for storage, and releases the potential energy stored in the spring 62 at the moment of the separation of the direction change movement of the truss 7, so that the moving speed of the truss 7 on the sliding rod 6 is maintained, and the sufficient vibration effect is provided for the supporting shell 1, and the bearing plate 63 arranged on the spring 62 enables the acting force on the truss 7 to be balanced on a plane, thereby improving the operation effect of the manufacturing process of the directional reflective film.
As an embodiment of the invention, a supporting rod 64 is further arranged at the end of the spring 62, the supporting rod 64 is mounted on the end 61, and the supporting rod 64 changes the extension amount of the spring 62 on the end 61 under the adjustment of the controller; in the manufacturing process of the reflective membrane, the reflective membrane with the corresponding cube-corner microstructure is manufactured by changing the slices with different models, so that the vibration effect of the support shell 1 needs to be correspondingly changed, the combination fit state among the slices is promoted, after the running power of the motor 31 is adjusted, the interaction state between the truss 7 and the sliding rod 6 needs to be correspondingly changed, and the adjustment effect on the vibration state of the support shell 1 is jointly improved; according to the invention, through the support rod 64 arranged on the end 61, the extending amount of the spring 62 is controlled by changing the position of the support rod 64 on the end 61, so that the sliding stroke of the truss 7 is adjusted, and the operation effect of the manufacturing process of the directional reflective film is improved.
When the supporting shell is used, the controller is started to jack the supporting plate 4 to the port of the supporting shell 1 through the telescopic frame 5, then the female die 11 is placed on the supporting plate 4 and is lowered to the bottom of the supporting shell 1, and then the male die 12 is installed on the female die 11 in the supporting shell 1; after a female die 11 is placed in the support shell 1, the support shell 1 is driven to swing by a motor 31 through a controller through the swing rods 2 arranged on the two sides of the support shell 1 in cooperation with the swing rods 2 to rotate the installed support legs 3, so that thin slices in the female die 11 are subjected to reciprocating action to generate mutual vibration, the tight fit state between the thin slices is enhanced, and the electromagnetic heating ring arranged in the boss 42 and the refrigerating slices in the edge groove 41 provide balanced heating and cooling effects for the installed female die 11, and the temperature control of the die is achieved; the shallow grooves 13 and the caulking grooves 43 are respectively arranged on the support shell 1 and the supporting plate 4, so that the telescopic frame 5 is positioned in a space formed by the shallow grooves 13 and the caulking grooves 43 after being contracted, the mutual fit state between the supporting plate 4 and the support shell 1 is ensured, and the telescopic frame 5 is controlled by the oil cylinder 52 to drive the supporting plate 4 to bear the weight of a mold through the slide block 51 hinged on the telescopic frame 5; the through holes 14 are arranged on the supporting shell 1 in a surrounding mode, in the cooling process of the die, the positions of the edge grooves 41 and the through holes 14 are communicated through the positions of the movable supporting plate 4, so that heat generated in the cooling process of the die by the edge grooves 41 is exhausted through the through holes 14 in the supporting shell 1, the heat dissipation capacity of the die is enhanced, and the purpose of quickly cooling in the working procedure is achieved; a sliding rod 6 arranged on the outer wall of the support shell 1 is matched with a truss 7 at the lower end of the swinging rod 2, so that the swinging action of the swinging rod 2 is converted into the movement of the sliding rod 6 on the horizontal plane of the truss 7, and further, the vibration effect on a die arranged in the support shell 1 is in the horizontal direction, and the joint state between the combined installation sheets in the die is ensured; the spring 62 arranged on the protruding end 61 of the sliding rod 6 transmits the inertia acting force to the deformation of the spring 62 at the end point of the change of the sliding direction of the truss 7 for storage, releases the potential energy stored in the spring 62 at the moment of the separation of the direction change movement of the truss 7, keeps the moving speed of the truss 7 on the sliding rod 6, provides enough vibration effect for the supporting shell 1, and a bearing plate 63 arranged on the spring 62 enables the acting force on the truss 7 to be balanced on a plane; the supporting rod 64 arranged on the end 61 controls the extending amount of the spring 62 by utilizing the position change of the supporting rod 64 on the end 61, thereby adjusting the sliding stroke of the truss 7.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (6)
1. The manufacturing process of the directional reflecting film is characterized by comprising the following steps of:
s1, compression molding: processing a microstructure of a cubic pyramid on the end face of the sheet, carrying out surface treatment on the sheet by nickel electroforming, and controlling the thickness of the sheet to ensure that a single row of cubic pyramids are distributed on the end face of the sheet;
s2, mold closing and injection molding: installing the sheets prepared in the S1 into a female die (11) to be mutually attached, then assembling a male die (12) onto the female die (11), fixing the boxed die on a die frame, heating the die to 210 ℃ and 240 ℃ through the die frame, injecting molten polyester plastic into a cavity of the die, controlling the injection molding process to be completed within 10-15S, and continuously increasing the die temperature in the injection molding process at the speed of 3-4 ℃/S;
s3, hot-press forming: after the injection molding process in S2 is finished, controlling the mold frame to continuously heat the mold to 20-40 ℃ and maintain for 3-5h, after the mold is naturally cooled to 220 ℃, starting a refrigerating sheet on the mold frame to actively cool the mold, reducing the temperature of the mold to below 90 ℃ within 30min, and then restoring the mold to a naturally cooled state to room temperature to obtain a prefabricated product of the reflective film;
s4, hardening and coating: transferring the prefabricated reflecting film product in the step S3 to a curing chamber under the conditions of constant temperature and constant humidity for hardening treatment, coating a polycarbonate material on the surface of the cubic pyramid microstructure to form a layer of transparent matrix for protecting the reflecting film structure, and then coating an adhesive on the bottom surface of the reflecting film and adhering a cover;
the die carrier in S2-S3 comprises a supporting shell (1), a swing rod (2) and a controller; a female die (11) is installed in the support shell (1), and a male die (12) is arranged above the female die (11); swing rods (2) are arranged on two sides of the support shell (1), supporting legs (3) which are rotatably arranged are arranged on the outer sides of the swing rods (2), and driving motors (31) are arranged on the supporting legs (3); a supporting plate (4) is arranged in the supporting shell (1), the circumferential edge of the supporting plate (4) is in sliding contact with the inner wall of the supporting shell (1), and a telescopic frame (5) is arranged between the supporting shell (1) and the supporting plate (4) and connected with the supporting shell; the supporting plate (4) moves between the bottom of the supporting shell (1) and the position of the port under the control of the telescopic frame (5); the upper surface of the supporting plate (4) is provided with intermittently arranged edge grooves (41), and refrigerating sheets are arranged in the edge grooves (41); the bulges among the edge grooves (41) on the supporting plate (4) are arranged into bosses (42), and electromagnetic heating rings are arranged in the bosses (42); the controller is used for adjusting the operation of the die carrier.
2. The process of claim 1, wherein the step of preparing the retroreflective sheeting comprises: the bottom of the support shell (1) is provided with a shallow groove (13); the bottom of the supporting plate (4) is provided with a caulking groove (43), and the position of the caulking groove (43) corresponds to that of the shallow groove (13); the end part of the telescopic frame (5) is provided with a hinged sliding block (51), and the sliding block (51) is respectively arranged in the shallow groove (13) and the caulking groove (43); and a driving oil cylinder (52) is also arranged between the sliding block (51) and the end part of the shallow groove (13).
3. The process of claim 2, wherein the step of preparing the retroreflective sheeting comprises: a surrounding through hole (14) is also formed in the circumferential direction of the support shell (1), and the through hole (14) corresponds to the end part of the edge groove (41) in the supporting plate (4); the supporting plate (4) is lifted by the oil cylinder (52) through the telescopic frame (5) under the action of the controller, so that the edge groove (41) is communicated with the through hole (14).
4. The process of claim 3, wherein the step of preparing the retroreflective sheeting comprises: a sliding rod (6) and a truss (7) are arranged at the joint of the support shell (1) and the swing rod (2); the sliding rod (6) is fixed on the outer wall of the support shell (1), and the length direction of the sliding rod is positioned on a horizontal plane; the truss (7) is in sliding contact with the sliding rod (6), and the truss (7) is rotatably arranged at the bottom of the swing rod (2).
5. The process of claim 4, wherein the step of preparing the directional reflecting film comprises the following steps: a convex end (61) is arranged at the end part of the sliding rod (6), and a spring (62) is arranged in the direction of the end (61) facing the truss (7); one end of the spring (62) is fixed on the end head (61), and the other end of the spring (62) is provided with a bearing plate (63) contacting the end part of the truss (7).
6. The process of claim 5, wherein: the end part of the spring (62) is also provided with a support rod (64), the support rod (64) is installed on the end head (61), and the support rod (64) changes the extending amount of the spring (62) on the end head (61) under the regulation of the controller.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011041956.8A CN112248359A (en) | 2020-09-28 | 2020-09-28 | Manufacturing process of directional reflective film |
| PCT/CN2021/089969 WO2022062393A1 (en) | 2020-09-28 | 2021-04-26 | Process for manufacturing directional reflective film |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011041956.8A CN112248359A (en) | 2020-09-28 | 2020-09-28 | Manufacturing process of directional reflective film |
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| CN112248359A true CN112248359A (en) | 2021-01-22 |
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| WO2022062393A1 (en) * | 2020-09-28 | 2022-03-31 | 夜视丽新材料(仙居)有限公司 | Process for manufacturing directional reflective film |
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| WO2022062393A1 (en) * | 2020-09-28 | 2022-03-31 | 夜视丽新材料(仙居)有限公司 | Process for manufacturing directional reflective film |
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Effective date of registration: 20210317 Address after: No.18, second Yicheng Road, Anzhou street, Xianju County, Taizhou City, Zhejiang Province, 317300 Applicant after: Yeshili new materials (Xianju) Co.,Ltd. Address before: 318000 No.310, Guanghui village, Sanjia street, Jiaojiang District, Taizhou City, Zhejiang Province Applicant before: Xu Jundong |
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