CN113370486A - Casting production process of degradable film - Google Patents
Casting production process of degradable film Download PDFInfo
- Publication number
- CN113370486A CN113370486A CN202110763142.3A CN202110763142A CN113370486A CN 113370486 A CN113370486 A CN 113370486A CN 202110763142 A CN202110763142 A CN 202110763142A CN 113370486 A CN113370486 A CN 113370486A
- Authority
- CN
- China
- Prior art keywords
- stretching
- film
- roller
- namely
- production process
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 22
- 238000005266 casting Methods 0.000 title claims abstract description 20
- 238000007493 shaping process Methods 0.000 claims abstract description 26
- 238000001816 cooling Methods 0.000 claims abstract description 16
- 230000003068 static effect Effects 0.000 claims abstract description 11
- 230000005611 electricity Effects 0.000 claims abstract description 10
- 238000003756 stirring Methods 0.000 claims abstract description 7
- 238000010345 tape casting Methods 0.000 claims abstract description 5
- 239000000463 material Substances 0.000 claims description 43
- 239000002245 particle Substances 0.000 claims description 31
- 238000010438 heat treatment Methods 0.000 claims description 9
- 229920000747 poly(lactic acid) Polymers 0.000 claims description 9
- 239000004626 polylactic acid Substances 0.000 claims description 9
- 238000002156 mixing Methods 0.000 claims description 7
- 229920001896 polybutyrate Polymers 0.000 claims description 6
- 238000001125 extrusion Methods 0.000 claims description 5
- 239000012257 stirred material Substances 0.000 claims description 5
- 239000008187 granular material Substances 0.000 claims description 3
- 238000009998 heat setting Methods 0.000 claims description 3
- 239000008188 pellet Substances 0.000 claims 2
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000012216 screening Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 238000007766 curtain coating Methods 0.000 description 2
- 238000005034 decoration Methods 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- 102100037458 Dephospho-CoA kinase Human genes 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 108010049285 dephospho-CoA kinase Proteins 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003000 extruded plastic Substances 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000008239 natural water Substances 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/022—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0018—Combinations of extrusion moulding with other shaping operations combined with shaping by orienting, stretching or shrinking, e.g. film blowing
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/07—Flat, e.g. panels
- B29C48/08—Flat, e.g. panels flexible, e.g. films
-
- 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
- B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
- B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
- B29C55/10—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial
- B29C55/12—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial biaxial
- B29C55/14—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial biaxial successively
-
- 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
- B29C69/00—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore
- B29C69/02—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore of moulding techniques only
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D7/00—Producing flat articles, e.g. films or sheets
- B29D7/01—Films or sheets
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
-
- 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
-
- 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
- B29K2067/04—Polyesters derived from hydroxycarboxylic acids
- B29K2067/046—PLA, i.e. polylactic acid or polylactide
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
- C08J2367/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
- C08J2367/04—Polyesters derived from hydroxy carboxylic acids, e.g. lactones
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2467/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
- C08J2467/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2467/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
- C08J2467/04—Polyesters derived from hydroxy carboxylic acids, e.g. lactones
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
Abstract
The invention discloses a casting production process of a degradable film, which comprises the following steps: (1) granulating and modifying; (2) stirring; (3) plasticizing and extruding; (4) tape casting; (5) longitudinally stretching, namely longitudinally stretching the cooled and shaped film; (6) transversely stretching, namely transversely stretching the longitudinally stretched film; (7) shaping and film forming, namely secondarily stretching the film subjected to longitudinal stretching and transverse stretching, shaping by a hot roller, and cooling by a cold roller; (8) eliminating static electricity; the invention has the beneficial effects that: through the first longitudinal stretching, the thickness of the film is reduced, the transverse stretching quality of the film is improved, the second longitudinal stretching is carried out on the film during shaping and film forming, the rebound rate of the film is reduced, the stretching force generated by the second longitudinal stretching is smaller than that generated by the first longitudinal stretching, and the yield and the productivity of the film can be effectively improved.
Description
Technical Field
The invention relates to a film manufacturing process, in particular to a tape casting production process of a degradable film.
Background
Nowadays, sanitary articles have become necessities of people's life, and various sanitary articles appear in people's daily life, and people's requirement for sanitary articles also gradually improves. Similarly, the requirements for films used in diapers are natural water swell height.
In the prior art, the film forming by injection molding generally adopts two modes, one mode is the curtain coating mode, the other mode is the blowing mode, the film of curtain coating mode production is difficult for stretching, the easy bounce, the film of two-sided coextrusion production can appear the condition that thickness is thicker after extruding, when horizontal stretching, can't reach better heating effect, influences tensile effect.
Disclosure of Invention
Aiming at the technical defects in the background art, the invention provides a casting production process of a degradable film, which solves the technical problems and meets the actual requirements, and the specific technical scheme is as follows:
a casting production process of a degradable film comprises the following steps:
(1) granulating and modifying, namely mixing the main material for preparing the film and the auxiliary material to prepare a plurality of material particles;
(2) stirring, namely uniformly stirring the prepared material particles;
(3) plasticizing and extruding, namely conveying the uniformly stirred material particles into a main extruder and an auxiliary extruder respectively to perform heating and plasticizing, converging the material particles and forming a film in a molten state by double-sided coextrusion extrusion through a die head;
(4) tape casting, namely cooling and shaping the film in a molten state;
(5) longitudinally stretching, namely longitudinally stretching the cooled and shaped film;
(6) transversely stretching, namely transversely stretching the longitudinally stretched film;
(7) and (3) forming a film by shaping, namely secondarily stretching the film subjected to longitudinal stretching and transverse stretching, shaping by a hot roller, and cooling by a cold roller to reduce the temperature of the film.
(8) And (4) eliminating static electricity, namely, eliminating the static electricity on the surface of the shaped film through a static electricity eliminating device.
The main materials for manufacturing the degradable film are PBAT and PLA polylactic acid modified materials.
And (2) weighing, mixing, plasticizing, extruding and granulating the main materials in sequence in the step (1), and screening the granulated material particles.
And (4) conveying the uniformly stirred material particles in the step (3) into a main extruder and an auxiliary extruder through a vacuum suction machine, heating, plasticizing, shearing and filtering the material particles, and finally converging the material particles to extrude the material particles through a die head.
And (5) longitudinally stretching the cast film through a longitudinal stretching device A, wherein the longitudinal stretching device A comprises a first stretching roller, a second stretching roller and a third stretching roller, the temperature of the first stretching roller is 73-77 ℃, the rotating speed of the first stretching roller is 60-80 revolutions per minute, the temperature of the second stretching roller is 73-77 ℃, the rotating speed of the second stretching roller is 80-100 revolutions per minute, the temperature of the third stretching roller is 73-77 ℃, and the rotating speed of the third stretching roller is 100-.
And (6) stretching the width of the film by a film width stretcher, wherein the film width stretcher comprises a rack, a heater, a feeder, a discharger and a holder, a preheating zone, a stretching zone and a shaping zone are arranged on the rack of the film stretcher, and the preheating zone, the stretching zone and the shaping zone are respectively provided with the heater.
The step (6) specifically comprises the following steps:
a, placing the film in a feeder, and clamping the two sides of the film by a clamp.
b, the film is clamped by the clamper and enters the preheating zone for preheating.
c, the gripper clamps the preheated film and enters a stretching area for transverse stretching.
In the step (6), the film conveying speed is 80-100m/min, the inlet temperature of the preheating zone is 65 ℃, the outlet temperature of the preheating zone is 85 ℃, and the inlet width of the stretching zone is 1500-2500mm and the outlet width is 2500-3500mm during transverse stretching.
In the step (7), the film subjected to width stretching is subjected to secondary longitudinal stretching by a longitudinal stretching device B, then is subjected to heat setting, and is subjected to cooling setting by a cooling setting roller set.
The longitudinal stretching device B comprises a fourth stretching roller, a fifth stretching roller and a sixth stretching roller, wherein the temperature of the fourth stretching roller is 70-75 ℃, the rotating speed of the fourth stretching roller is 110-.
The invention has the beneficial effects that:
(1) the main materials of the film are PBAT and PLA, and PBAT plastic particles and PLA are biodegradable materials, so that the film produced by casting has a degradation function and better meets the standards of environmental protection and harmlessness.
(2) After the film is extruded through double-sided co-extrusion, the thickness is thick, the film is longitudinally stretched for the first time through the rotating speed difference of the longitudinal stretching device A, the thickness of the film is effectively reduced, heating is more uniform during transverse stretching, and a better transverse stretching effect is obtained.
(3) After the film is transversely stretched, the film is transversely stretched for the second time through the longitudinal stretching device B, the rotating speed difference exists among the fourth stretching roller, the fifth stretching roller and the sixth stretching roller, the film is longitudinally stretched for the second time through the rotating speed difference, the rebound rate of the film is reduced, and a better stretching effect is achieved.
Drawings
FIG. 1 is a schematic side view of a film width stretching machine according to the present invention.
FIG. 2 is a schematic top view of the film width stretching machine of the present invention.
FIG. 3 is a schematic view of the structure of a holder of the film width stretching machine of the present invention.
Wherein: the device comprises a frame 1, a heater 2, a feeder 3, a discharger 4, a clamp 5, a preheating zone 6, a stretching zone 7 and a shaping zone 8.
Detailed Description
Embodiments of the present invention will be described below with reference to the accompanying drawings and related embodiments, wherein the following related embodiments are merely preferred embodiments for better illustrating the present invention itself, and the embodiments of the present invention are not limited to the following embodiments, and the present invention relates to the related essential parts in the technical field, which should be regarded as the known technology in the technical field and can be known and grasped by those skilled in the art.
A casting production process of a degradable film comprises the following steps:
(1) granulating and modifying, namely mixing the main material for preparing the film and the auxiliary material to prepare a plurality of material particles;
(2) stirring, namely uniformly stirring the prepared material particles;
(3) plasticizing and extruding, namely conveying the uniformly stirred material particles into a main extruder and an auxiliary extruder respectively to perform heating and plasticizing, converging the material particles and forming a film in a molten state by double-sided coextrusion extrusion through a die head;
(4) tape casting, namely cooling and shaping the film in a molten state;
(5) longitudinally stretching, namely longitudinally stretching the cooled and shaped film;
(6) transversely stretching, namely transversely stretching the longitudinally stretched film;
(7) and (3) forming a film by shaping, namely secondarily stretching the film subjected to longitudinal stretching and transverse stretching, shaping by a hot roller, and cooling by a cold roller to reduce the temperature of the film.
(8) And (4) eliminating static electricity, namely, eliminating the static electricity on the surface of the shaped film through a static electricity eliminating device.
And (2) sequentially weighing, mixing, plasticizing, extruding and granulating the main material and the auxiliary material in the step (1), and screening the granulated material particles.
The step (1) specifically comprises the following steps: PBAT and PLA are used as raw materials.
S1, putting the PPAT plastic particles and the PLA which meet the requirements into a charging barrel;
s2, hoisting the feeding barrel to a weightlessness scale by a traveling crane to measure the weight;
s3, after weight measurement is finished, conveying the main material and the auxiliary material into a high-cooling mixing unit through a spiral fan for mixing;
s4, conveying the mixed plastic particles into a double-screw unit through a spiral feeding machine to be sequentially plasticized, dispersed and sheared and extruded, feeding during plasticizing, and putting calcium carbonate and auxiliary materials to be supplemented into the double-screw unit;
s5, extruding and granulating the cut and extruded plastic piece by a single screw unit to form material particles;
and S6, conveying the material particles to a screening machine for screening, and uniformly putting the screened qualified material particles into a storage bin for storage.
The main materials for preparing the degradable film are PBAT and PLA, and the two materials are degradable materials, so that the film produced by casting has a degradation function, and can be applied to paper diapers, sanitary towels, shopping bags and freshness protection bags, and the environment-friendly and harmless standard is better met.
The feeding barrel is weighed through the weightlessness scale to achieve the purpose of accurate feeding, and waste of redundant material particles is avoided.
The material particles are conveyed to a screening machine for screening, so that the material particles can be screened, and the film forming quality in the subsequent process is ensured.
And (4) conveying the uniformly stirred material particles in the step (3) into a main extruder and an auxiliary extruder through a vacuum suction machine, heating, plasticizing, shearing and filtering the material particles, and finally converging the material particles to extrude the material particles through a die head.
And (5) longitudinally stretching the cast film through a longitudinal stretching device A, wherein the longitudinal stretching device A comprises a first stretching roller, a second stretching roller and a third stretching roller, the temperature of the first stretching roller is 73-77 ℃, the rotating speed of the first stretching roller is 60-80 revolutions per minute, the temperature of the second stretching roller is 73-77 ℃, the rotating speed of the second stretching roller is 80-100 revolutions per minute, the temperature of the third stretching roller is 73-77 ℃, and the rotating speed of the third stretching roller is 100-.
The thickness of the film after the confluence extrusion through the main extruder and the auxiliary extruder is thicker, and the film is directly subjected to width stretching, the heater on the film width stretching machine can not uniformly heat the film, the longitudinal stretching device A can perform first longitudinal stretching on the film through the first stretching roller, the second stretching roller and the third stretching roller before the film is subjected to width stretching, and after the longitudinal length of the film is stretched, the thickness of the film can be effectively reduced, so that the film can be heated more uniformly by the heater when the film is transversely stretched.
The first stretching roller, the second stretching roller and the third stretching roller have the same temperature and the different rotating speeds, so that the film can be stretched longitudinally for the first time through the rotating speed difference between the first stretching roller and the second stretching roller and between the second stretching roller and the third stretching roller in a stable temperature state.
And (3) stretching the width of the film in the step (6) by using a film width stretcher, wherein the film width stretcher comprises a rack 1, a heater 2, a feeder 3, a discharging device 4 and a holder 5, a preheating zone 6, a stretching zone 7 and a shaping zone 8 are arranged on the rack of the film stretcher, and the preheating zone 6, the stretching zone 7 and the shaping zone 8 are respectively provided with the heater 2.
The step (6) specifically comprises the following steps:
a, placing the film in a feeder, and clamping the two sides of the film by a clamp.
b, the film is clamped by the clamper and enters the preheating zone for preheating.
c, the gripper clamps the preheated film and enters a stretching area for transverse stretching.
In the step (6), the film conveying speed is 80-100m/min, the inlet temperature of the preheating zone is 65 ℃, the outlet temperature of the preheating zone is 85 ℃, and the inlet width of the stretching zone is 1500-2500mm and the outlet width is 2500-3500mm during transverse stretching.
It should be noted that, heaters 2 are respectively arranged above and below the preheating zone 6, the stretching zone 7 and the shaping zone 8, the heaters 2 are hot air heaters, when the film is transversely stretched by the film stretcher, the heaters 2 respectively heat the two sides of the film from above and below, and after the film is longitudinally stretched for the first time by the longitudinal stretching device a, the thickness of the film is reduced, so that heat can better permeate into the film, and the transverse stretching quality of the film can be improved.
It should be noted that the film width stretching machine is divided into three sections of areas to stretch the width of the film, which are respectively a preheating area 6, a stretching area 7 and a shaping area 8, the widths of the preheating area 6, the stretching area 7 and the shaping area 8 can be adjusted according to actual production requirements, and the temperatures of the preheating area 6, the stretching area 7 and the shaping area 8 can be independently controlled, because the stretching ratios are different when the film is stretched, or the required product has different performances, and the heating temperatures are different, so that the process can be conveniently adjusted to make a suitable product.
After the film is longitudinally stretched in the first round, the film is clamped by the clamping devices 5 at two sides and is sent to the preheating zone 6, the temperature of the preheating zone 6 is 65-85 ℃, the film can be preliminarily stretched in the preheating zone 6, after the preliminary stretching in the preheating zone 6, the clamping devices 5 clamp the film and come to the stretching zone 7, in the stretching zone 7, the width of the film is gradually increased under the action of the clamping devices 5, the width and the angle of the clamping devices 5 can be adjusted according to actual conditions, the width of the film at the inlet of the stretching zone 7 is equal to the width of the film at the outlet of the preheating zone 6, and the width of the film at the outlet of the stretching zone 7 is equal to the width at the inlet of the shaping zone 8.
In the step (7), the film subjected to width stretching is subjected to heat setting by a longitudinal stretching device B, and then is subjected to cooling setting by a cooling setting roll set.
The longitudinal stretching device B comprises a fourth stretching roller, a fifth stretching roller and a sixth stretching roller, wherein the temperature of the fourth stretching roller is 70-75 ℃, the rotating speed of the fourth stretching roller is 110-.
It should be noted that after the film is subjected to the casting molding in step (4), when the temperature is cooled to be consistent with the temperatures of the first stretching roller, the second stretching roller and the third stretching roller, the film is longitudinally stretched by the longitudinal stretching device a, the heat of the film is kept from losing by the first stretching roller, the second stretching roller and the third stretching roller, the longitudinal stretching is directly facilitated, the heating time required in step (5) is reduced, the longitudinal stretching device a and the longitudinal stretching device B can reach higher rotating speed, and the stretching efficiency and the working efficiency are increased.
It should be noted that the rebound rate of the stretched film is high, after the film is longitudinally stretched by the longitudinal stretching device a, the thickness of the film can be reduced, and the width of the film can be conveniently stretched, and after the width of the film is stretched, the film can be longitudinally stretched to the state of a final finished product by performing the second longitudinal stretching.
The longitudinal stretching device B performs the second longitudinal stretching of the film after the width stretching by the rotation speed difference between the fourth stretching roller, the fifth stretching roller and the sixth stretching roller, and the thickness of the film after the second longitudinal stretching is smaller than that of the film before the first stretching, so that the film can be thinner than other films and has higher strength.
The rotation speed difference between the fourth stretching roller, the fifth stretching roller and the sixth stretching roller is smaller than the rotation speed difference between the first stretching roller, the second stretching roller and the third stretching roller, so that the stretching force acting on the film between the fourth stretching roller, the fifth stretching roller and the sixth stretching roller is smaller than the stretching force acting on the film between the first stretching roller, the second stretching roller and the third stretching roller, and the film stretching is more stable.
The film can be embossed on the end face of the film according to requirements after being longitudinally stretched for the second time, and the end face of the film is subjected to static elimination rolling after the process requirements of a finished product are met.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. The casting production process of the degradable film is characterized by comprising the following steps of:
(1) granulating and modifying, namely mixing the main material for preparing the film and the auxiliary material, and modifying to prepare a plurality of material particles;
(2) stirring, namely uniformly stirring the prepared material particles;
(3) plasticizing and extruding, namely conveying the uniformly stirred material particles into a main extruder and an auxiliary extruder respectively to perform heating and plasticizing, converging the material particles and forming a film in a molten state by double-sided coextrusion extrusion through a die head;
(4) tape casting, namely cooling and shaping the film in a molten state;
(5) longitudinally stretching, namely longitudinally stretching the cooled and shaped film;
(6) transversely stretching, namely transversely stretching the longitudinally stretched film;
(7) and (3) forming a film by shaping, namely secondarily stretching the film subjected to longitudinal stretching and transverse stretching, shaping by a hot roller, and cooling by a cold roller to reduce the temperature of the film.
(8) And (4) eliminating static electricity, namely, eliminating the static electricity on the surface of the shaped film through a static electricity eliminating device.
2. The casting production process of the degradable film as claimed in claim 1, wherein the main materials for making the degradable film are PBAT and PLA polylactic acid modified materials.
3. The casting production process of the degradable film according to claim 1, wherein the main material is sequentially weighed, mixed, plasticized, extruded and granulated in step (1), and the granulated material is screened.
4. The casting production process of the degradable film according to claim 1, wherein the pellet stirred uniformly in step (3) is transported into the main extruder and the auxiliary extruder by a vacuum suction machine, and the pellet is heated, plasticized, sheared and filtered, and finally converged and extruded through the die head.
5. The casting production process of degradable film according to claim 1, wherein the film after casting setting in step (5) is longitudinally stretched by a longitudinal stretching device A, the longitudinal stretching device A comprises a first stretching roller, a second stretching roller and a third stretching roller, wherein the temperature of the first stretching roller is 73-77 ℃, the rotation speed of the first stretching roller is 60-80 rpm, the temperature of the second stretching roller is 73-77 ℃, the rotation speed of the second stretching roller is 80-100 rpm, the temperature of the third stretching roller is 73-77 ℃, and the rotation speed of the third stretching roller is 100-.
6. The casting production process of the degradable film according to claim 1, wherein in the step (6), the width of the film is stretched by a film width stretcher, the film width stretcher comprises a frame, a heater, a feeder, a discharger and a holder, the frame of the film width stretcher is provided with a preheating zone, a stretching zone and a shaping zone, and the preheating zone, the stretching zone and the shaping zone are provided with heaters.
7. The casting production process of the degradable film according to claim 6, wherein the step (6) comprises the following steps:
a, placing the film in a feeder, and clamping the two sides of the film by a clamp.
b, the film is clamped by the clamper and enters the preheating zone for preheating.
c, the gripper clamps the preheated film and enters a stretching area for transverse stretching.
8. The casting production process of degradable film as claimed in claim 7, wherein in step (6), the film conveying speed is 80-100m/min, the inlet temperature of the preheating zone is 65 ℃, the outlet temperature of the preheating zone is 85 ℃, and the inlet width of the stretching zone is 1500-2500mm and the outlet width is 2500-3500mm during transverse stretching.
9. The casting production process of degradable film according to claim 1, wherein in step (7), the film after width stretching is subjected to secondary longitudinal stretching by a longitudinal stretching device B, then is subjected to heat setting, and is subjected to cooling setting by a cooling setting roller set.
10. The casting production process of the degradable film as claimed in claim 9, wherein the longitudinal stretching device B comprises a fourth stretching roller, a fifth stretching roller and a sixth stretching roller, wherein the temperature of the fourth stretching roller is 70-75 ℃, the rotation speed of the fourth stretching roller is 110-120 rpm, the temperature of the fifth stretching roller is 75-80 ℃, the rotation speed of the fifth stretching roller is 120-130 rpm, the temperature of the sixth stretching roller is 80-85 ℃, the rotation speed of the sixth stretching roller is 130-140 rpm, the temperature of the cooling shaping roller set is 15-25 ℃, and the rotation speed of the cooling shaping roller set is 120-140 rpm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110763142.3A CN113370486A (en) | 2021-07-06 | 2021-07-06 | Casting production process of degradable film |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110763142.3A CN113370486A (en) | 2021-07-06 | 2021-07-06 | Casting production process of degradable film |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113370486A true CN113370486A (en) | 2021-09-10 |
Family
ID=77581130
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110763142.3A Pending CN113370486A (en) | 2021-07-06 | 2021-07-06 | Casting production process of degradable film |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113370486A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114292502A (en) * | 2022-01-05 | 2022-04-08 | 湖北拓盈新材料有限公司 | Preparation method of biodegradable casting film |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102601885A (en) * | 2012-03-20 | 2012-07-25 | 江苏景宏新材料科技有限公司 | Process for preparing lithium-ion battery diaphragms strengthened by drawing transversely and longitudinally |
| CN205272577U (en) * | 2015-11-16 | 2016-06-01 | 湖南银丰塑料包装有限公司 | Film lateral stretching device |
| CN107139563A (en) * | 2017-06-07 | 2017-09-08 | 福建琦峰科技有限公司 | A kind of double-colored ventilated membrane and its production technology and application |
| CN110978575A (en) * | 2019-12-03 | 2020-04-10 | 晋江市兆安科技有限公司 | Manufacturing process of breathable film |
| CN113043510A (en) * | 2021-03-26 | 2021-06-29 | 浙江中聚材料有限公司 | Static electricity removing device and manufacturing equipment of polyolefin film/sheet with same |
-
2021
- 2021-07-06 CN CN202110763142.3A patent/CN113370486A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102601885A (en) * | 2012-03-20 | 2012-07-25 | 江苏景宏新材料科技有限公司 | Process for preparing lithium-ion battery diaphragms strengthened by drawing transversely and longitudinally |
| CN205272577U (en) * | 2015-11-16 | 2016-06-01 | 湖南银丰塑料包装有限公司 | Film lateral stretching device |
| CN107139563A (en) * | 2017-06-07 | 2017-09-08 | 福建琦峰科技有限公司 | A kind of double-colored ventilated membrane and its production technology and application |
| CN110978575A (en) * | 2019-12-03 | 2020-04-10 | 晋江市兆安科技有限公司 | Manufacturing process of breathable film |
| CN113043510A (en) * | 2021-03-26 | 2021-06-29 | 浙江中聚材料有限公司 | Static electricity removing device and manufacturing equipment of polyolefin film/sheet with same |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114292502A (en) * | 2022-01-05 | 2022-04-08 | 湖北拓盈新材料有限公司 | Preparation method of biodegradable casting film |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPH0241405B2 (en) | ||
| CN103789869A (en) | Method for producing flat filaments by using PET (Polyethylene Terephthalate) | |
| JPS61500839A (en) | Molten thermoplastic web feeding method and device | |
| CN110978575B (en) | Manufacturing process of breathable film | |
| CN112848422A (en) | Preparation method of biological heat-reducing shrink label film | |
| CN102205655B (en) | Continuous production process of polyethylene (PE) breathable film | |
| CN102205654B (en) | One-step production process of polyethylene (PE) breathable film | |
| CN113370486A (en) | Casting production process of degradable film | |
| CN112898702A (en) | Environment-friendly ultrathin hard PVC sheet and assembly line production equipment thereof | |
| CN101767465B (en) | Method for preparing thermoplastic resin film | |
| KR20190001420A (en) | Calender and T-die integrated thermoplastic film/sheet production facility and method for preparing the thermoplastic film/sheet using the same | |
| CN214447919U (en) | Online recovery unit of sheet leftover bits in PVC sheet production process | |
| CN103358516A (en) | Fusion coating roll-forming method and device for homopolymer composite material | |
| CN102873950A (en) | High-surface-energy double-direction stretching polypropylene thin film and manufacturing method thereof | |
| JP3623681B2 (en) | Method for producing 25-250 micron biaxially oriented polypropylene (BOPP) pearl gloss synthetic paper obtained by three-layer coextrusion method | |
| CN111716672A (en) | Special process method for producing PBT plastic plate | |
| CN105128370A (en) | Preparation method of high-flexibility BOPP (Biaxially-oriented Polypropylene) film | |
| CN214447911U (en) | Tensioning device used before finished product collection in PVC sheet production line equipment | |
| CN112959784B (en) | High-light-transmission heat-insulation ultraviolet-proof polyester film and preparation method thereof | |
| CN203527849U (en) | Blow-molding system for three-layer coextruded plastic film | |
| CN108623880A (en) | A kind of production method of lignin/low density polyethylene (LDPE) inflation film | |
| CN112829412A (en) | High-performance polypropylene aluminum-plated base film and preparation method thereof | |
| CN102848569B (en) | Production method of two-way stretched thin film made of 3-hydroxybutyrate-4-hydroxybutyrate copolymer | |
| JP2007537324A (en) | Extrusion method | |
| CN111716673A (en) | Special process for producing PET plastic plate |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210910 |