KR101956118B1 - Polymer fiber puck manufacturing method for structural reinforcing - Google Patents

Abstract

Disclosed is a method for manufacturing a synthetic fiber puck for structural reinforcement, which is manufactured by wrapping a synthetic fiber bundle with a water-soluble film, and then cutting the same into predetermined lengths to manufacture the synthetic fiber puck with a plurality of short fibers are bundled, thereby having increased mechanical properties of a concrete composition, since dispersibility and adhesiveness of short fibers are increased when the synthetic fiber is mixed into a concrete.

Description

TECHNICAL FIELD [0001] The present invention relates to a synthetic fiber puck for structural reinforcement,

The present invention relates to a method of manufacturing a synthetic fiber puck for structural reinforcement, and more particularly, to a method of manufacturing a synthetic fiber puck for structural reinforcement, wherein the mechanical properties of a concrete composition are improved by improving the dispersibility upon incorporation into concrete.

Staple fiber is included in concrete and used in reinforced concrete or shotcrete as a tunnel construction, or as a secondary slab or concrete product for reinforcement in products such as poles.

In general, staple fiber refers to an artificial fiber made of synthetic resin as a raw material. Depending on the kind of synthetic resin, polypropylene type, polyester type, polyacrylonitrile type, polyamide type, polyvinyl chloride type, polyurethane type, polyolefin type, And fluoroethylene-based ones.

These staple fibers are used in combination with concrete which is resistant to compression but weak in tensile strength to compensate for the weak brittleness of the concrete. That is, reinforcing the concrete with the above-mentioned staple fiber can further enhance the crack resistance, tensile strength and toughness of the concrete.

Conventional conventional staple fibers are prepared by spinning a solution of the synthetic resin in the form of a melt, a solution, and an emulsion, and are produced by cutting to have a length of about 10 mm to 100 mm.

However, since conventional staple fibers have a low aspect ratio and specific gravity, they are not properly dispersed or mixed in concrete. As a result, staple fibers are entangled or aggregated (fiber ball) is generated, which is a big problem in the construction site. In addition to this, it is difficult to input the product, and scattered dust may be generated and adversely affect the health hygiene of the worker. Further, there are limitations in that various problems such as reduction in strength and slump due to dispersion failure of concrete are derived, and thus, they are not satisfied with the intended use purpose.

Disclosure of Invention Technical Problem [8] The present invention has been conceived to solve the above-mentioned problems of the prior art, and it is an object of the present invention to provide a synthetic fiber puck comprising a plurality of short fibers bundled by laminating a synthetic fiber bundle with a water- The present invention relates to a method for manufacturing a synthetic fiber puck for structural reinforcement in which the dispersibility of short fibers is improved to increase the mechanical properties of a concrete composition.

The above object of the present invention can be accomplished by a method of manufacturing a synthetic resin melt extruding apparatus, comprising: a synthetic resin melt extrusion step of injecting synthetic resin into a cylinder of an extruder and melt extruding through a heated screw; A synthetic fiber spinning step of spinning the melt extruded synthetic resin with synthetic fiber using a head nozzle of an extruder; A synthetic fiber cooling step of transferring the synthetic fibers radiated into the water tub containing the cooling water to cool the synthetic fibers; A synthetic fiber drawing step of heating the cooled synthetic fiber and stretching the synthetic fiber using a stretching roller; An embossing step of embossing the concave-convex pattern on the synthetic fiber using the M-view; A synthetic fiber winding step of winding synthetic fibers on a plurality of bobbins mounted on a spindle of a winder; A synthetic fiber bundling step of bundling the synthetic fibers wound on a plurality of bobbins and feeding the bundles of synthetic fibers along the bundling rollers in multiple steps while converging the bundles so that the diameter of the synthetic fibers is reduced; A synthetic fiber bundle wrapping step of wrapping and wrapping the outer surface of the bundled synthetic fiber bundle with a water-soluble film; And a synthetic fiber puck fabricated by cutting a synthetic fiber bundle bundled with a water-soluble film into a predetermined length to produce a synthetic fiber puck in which a plurality of short fibers are bundled. ≪ / RTI >

The synthetic resin is melt-extruded through a screw heated to 170 to 300 DEG C, and the melt-extruded synthetic resin is radiated as synthetic fibers through a head nozzle having a diameter of 1 mm to 5 mm, The synthetic fiber puck is stretched to have a diameter of 0.3 to 1.0 mm through the stretching roller heated to 170 DEG C and the synthetic fiber puck is made of 300 to 3000 short fibers and has a length of 30 to 70 mm, The staple fiber preferably has an elastic modulus of 5 GPa to 10 GPa, a specific gravity of 0.9 g / cm3 to 0.92 g / cm3, and a tensile strength of 550 MPa to 650 MPa.

The synthetic fibers wound around the plurality of bobbins are guided through guiding rings and collected in a guide tube. The guiding tube is provided with a pulling roller. The guiding tube is provided on the upper side between the guiding tube and the pulling roller, A synthetic resin fiber bundle conveyed from the guide tube to the pulling roller is moved to the upper side of the support roller and to the lower side of the press roller while being stretched to be conveyed while being conveyed, A synthetic fiber bundle is fed along a plurality of converging rollers sequentially disposed on the rear side of the converging tube and is gradually converged while being reduced in diameter while the converging roller is formed with a converging groove on the outer surface thereof An upper focusing roller and a lower focusing roller, and the synthetic fiber bundle is composed of an upper focusing roller and a lower focusing And the collecting grooves of the collecting rollers are reduced in size toward the collecting rollers positioned on the rear side, and when the collecting fiber bundles are sequentially conveyed along the plurality of collecting rollers, It is preferable that they are configured to be compact as the diameter decreases.

The synthetic fiber bundle is fed into a focusing dice and transported. The water-soluble film is wrapped on an outer surface of a synthetic fiber bundle which is fed into a focusing dice through a lapping device installed on the outer side of the focusing dice, The lapping device comprises a rotating plate which is received on the outer surface of the focusing dice so as to be received by a driving force of the motor and a bobbin supporting bar protruding from one side of the rotating plate and in which a winding bobbin on which the water- The winding bobbin coupled to the bobbin support rods is rotated about the longitudinal axis of the synthetic fiber bundle by the rotation of the rotary plate, the water-soluble film is unwound from the winding bobbin, and a part of the width of the water- So as to bundle the synthetic fiber bundles.

The synthetic fiber puck for structural reinforcement manufactured by the manufacturing method of the present invention prevents the tangling or aggregation of short fibers in the mixed concrete or shotcrete due to excellent dispersibility when mixed in concrete and shotcrete, It is not only easy but also has an effect of improving adhesion with concrete or shotcrete.

In addition, the synthetic fiber puck for structural reinforcement according to the present invention is effective in hygiene of a worker because it does not generate scattering dust when mixed into concrete and shotcrete.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a process diagram of a method of manufacturing a synthetic fiber puck for structural reinforcement according to the present invention;
FIG. 2 is a schematic view showing a synthetic fiber puck fabrication process for structural reinforcement according to the present invention,
Figure 3 is a sequential illustration of a synthetic fiber puck made according to the present invention,
4 is a view for explaining a focusing process of a synthetic fiber bundle in the present invention,
5 is a view for explaining a process of wrapping a water-soluble film on the outer surface of a synthetic fiber bundle and a process of producing a synthetic fiber puck in the present invention.

Hereinafter, a method of manufacturing a synthetic fiber puck for structural reinforcement according to the present invention will be described in detail.

FIG. 2 is a schematic view illustrating a process for manufacturing a synthetic fiber puck for structural reinforcement according to the present invention, and FIG. 3 is a schematic view illustrating a process for producing a synthetic fiber puck for structural reinforcement according to the present invention. Lt; RTI ID = 0.0 > puck < / RTI >

The present invention relates to a process for producing a synthetic fiber by melt extrusion (S10), synthetic fiber spinning (S20), synthetic fiber cooling (S30), synthetic fiber stretching (S40), embossing (S50) A fiber bundle wrapping step (S70), and a synthetic fiber puck manufacturing step (S80).

The synthetic resin melt extrusion step S10 is a step of injecting synthetic resin into a cylinder of the extruder 100 and melt extruding the synthetic resin through a heated screw 110. The inserted synthetic resin has a screw 110 heated to 170 to 300 캜 And then melt-extruded.

The synthetic resin to be fed into the extruder 100 is preferably a thermoplastic resin which is melted at a high temperature, more preferably a polyolefin, polypropylene, ethylene or nylon having a low melting point and good physical properties such as heat- .

The synthetic fiber spinning step S20 is a step of spinning the synthetic resin melt-extruded by using the head nozzle 120 of the extruder with the synthetic fibers F. The synthetic fiber spinning step S20 is a step of spinning the synthetic fibers through the screw 110 of the extruder 100 The synthetic resin is radiated with synthetic fibers F through a head nozzle 120 having a hole W of 1 mm to 5 mm. Here, the synthetic fibers F may have various cross-sectional shapes depending on the shape of the hole of the head nozzle 120. In addition, it is preferable that a plurality of holes of the head nozzle 120 are formed so that a plurality of synthetic fibers F are simultaneously emitted.

The synthetic fiber cooling step S30 is a step of cooling the synthetic fibers by transferring the synthetic fibers F radiated into the water tub 200 containing the cooling water W, The fibers F are rapidly cooled and hardened through the water tub 200.

Here, the cooling water temperature of the water tub 200 is preferably 4 to 30 ° C to prevent the synthetic fibers F from being cured at an excessively low temperature or being not fully cured due to high temperature.

The synthetic fiber drawing step (S40) is a step of heating the cooled synthetic fibers (F) and drawing the synthetic fibers (F) using a stretching roller. That is, the synthetic fiber drawing step (S40) is a step of stretching the synthetic fibers (F) radiated from the extruder and shaping the synthetic fibers (F) to have a size that can be used practically.

Here, it is preferable that the synthetic fiber drawing step is performed in two steps through the first stretching part 310 and the second stretching part 320.

More specifically, the first stretching unit 310 applies heat to the synthetic fibers F pulled in the transport direction by the first stretching roller 311 and the second stretching roller 312, So that the synthetic fibers (F) are firstly stretched and the structure is stabilized. The second stretching part 320 applies heat to the synthetic fibers F pulled in the conveying direction by the second stretching roller 312 and the third stretching roller 321 so as to be conveyed The synthetic fibers (F) are constituted so as to stabilize the secondary stretching and the structure. Here, the synthetic fibers F are heated to 150 ° C to 170 ° C so that the heat is uniformly transferred to the synthetic fibers. Since the synthetic fibers F are heated to a predetermined temperature by the heat blowers 313 and 322 to impart flexibility to the synthetic fibers F, the synthetic fibers F are fed to the first stretching roller 311, the second stretching roller 312 and the third stretching roller 321 The stretching rollers 311, 312, and 321 may be stretched to a predetermined length by a pulling force to hold the stretching rollers 311, 312, and 321 and the stretching rollers 311, 312, and 321 in tension. It is preferable that the synthetic fibers F 'have a diameter W of 0.3 mm to 1.0 mm through the stretching rollers 311, 312 and 321.

The embossing step S50 is a step of embossing the concave-convex shape on the synthetic fiber F 'using the emblem 400. Generally, synthetic fibers (F ') that have undergone a stretching process have a smooth surface and a hydrophobic nature. Therefore, in order to facilitate adhesion of the concrete and the fiber, the embossing pattern 400 is formed on the synthetic resin F 'after the stretching process using the wavy or serrated roller.

The synthetic fiber winding step S60 is a step of winding the synthetic fibers F 'on a plurality of bobbins 511 mounted on the spindle 510 of the winder 500. Since the synthetic fibers F 'wound around the bobbin 511 are configured so that a plurality of synthetic fibers spirally wound at the same time are wound in the synthetic fiber spinning step S10, a plurality of synthetic resins F' do. Preferably, the synthetic fibers F wound on the bobbin 511 are wound in a group of 10 to 100 strands. Since the synthetic fibers F 'are wound around a plurality of bobbins 511 mounted on the spindle 510 of the winder 500, the synthetic fiber winding step S60 S70), a plurality of bobbins 511 directly sprays synthetic fibers to supply the synthetic fibers at the same time. Therefore, the synthetic fibers F 'are wound around the bobbin attached to the spindle 510 of the wiper 500 without the movement of the bobbin 511 wound with the synthetic resin F' Step can be performed.

The synthetic fiber bundling step S60 is a step of collecting the synthetic fibers F 'wound around a plurality of bobbins 511 and supplying the bundles of synthetic fibers F in a bundle, This is a process of focusing. That is, the synthetic fiber gathering step (S60) can reduce the vacancy rate between the synthetic fibers (F ') to facilitate the later-described synthetic fiber bundle wrapping step, and the synthetic fiber (F') So that the synthetic fibers F 'are not separated from the water-soluble film 10.

More specifically, in the synthetic fiber focusing step S60, the synthetic fibers F 'wound on the plurality of bobbins 511 are guided through the guide rings 611 and collected into the guide tube 612, . On the rear side of the guide tube 612 is provided a pulling roller 613 and a supporting roller 614 and a pressing roller 615 are provided on the upper side between the guide tube 612 and the pulling roller 613 And the synthetic fiber bundle B conveyed to the pulling roller 613 from the guide tube 612 is moved to the upper side of the support roller 614 and to the lower side of the press roller 615, .

4, the synthetic fiber bundle B having passed through the pulling rollers 613 is fed into a focusing tube 616 and is conveyed to a plurality of collecting rollers 616 sequentially disposed on the rear side of the collecting tube 616. [ And is gradually converged while being reduced in diameter while being transported along the transporting path 620. The gathering roller 620 is composed of an upper collecting roller 621 and a lower collecting roller 622 on which the collecting grooves 621a and 622a are formed and the synthetic fiber bundle B includes an upper collecting roller 621, 622a between the lower focusing roller 622 and the lower focusing roller 622. The collecting grooves 621a, 622a of the collecting roller are reduced in size toward the collecting roller located on the rear side When the synthetic fiber bundle is sequentially conveyed along a plurality of converging rollers, the diameter gradually decreases to be concentrated.

The synthetic fiber bundle wrapping step (S70) is a process of wrapping the outer surface of the bundled synthetic fiber bundle (B) with the water-soluble film (10). That is, the bundled synthetic fiber bundle B is fed into the bundling dies 710, and fed to the bundling dies through a lapping device 720 provided outside the bundling dies 710, And the water-soluble film (10) is wrapped on the outer surface of the base film (B).

5, the lapping apparatus 720 includes a rotation plate 721 that is received on the driving force of a motor (not shown) and is rotatably installed on the outer surface of the focusing dies 710, And a bobbin support bar 722 protruding from one side of the bobbin 721 and having a winding bobbin 723 wound with the water-soluble film 10 rotatably fitted thereon. The winding bobbin 723 coupled to the bobbin support bar 722 is rotated about the longitudinal axis of the synthetic fiber bundle B by the rotation of the rotation plate 721 and is wound on the water-soluble film 10 The synthetic fiber bundle B is wrapped continuously on the outer surface of the synthetic fiber bundle B so that a part of the width of the water-soluble film 10 is overlapped.

In the synthetic fiber puck manufacturing step S80, the synthetic fiber bundle B bundled with the water-soluble film 10 is cut to a predetermined length to produce a synthetic fiber puck P having a plurality of short fibers F " The water-soluble film is continuously wrapped on the outer surface of the synthetic fiber bundle B by the cutter 732 which is vertically operated by the cylinder 731 and the bundled synthetic fiber bundle B is cut into a predetermined length To produce a synthetic fiber puck (P) in which a plurality of short fibers (F ") are bundled.

Here, the synthetic fiber puck P is preferably made of 300 to 3000 short fibers. That is, when the number of the short fibers (F ") of the synthetic fiber puck is less than 300, the dispersion is uniform within the concrete but the productivity is decreased. But the synthetic fiber puck P is preferably composed of 300 to 3,000 short fibers (F ") because the productivity is increased but the dispersibility is lowered.

The synthetic fiber puck P preferably has a length of 30 mm to 70 mm. When the synthetic fiber puck P is cut to 30 to 70 mm, the length of the short fibers F "constituting the synthetic fiber puck P also has a length of 30 mm to 70 mm. (F ") of less than 30 mm, the improvement of the physical properties of the structural reinforced concrete composition after mixing with concrete is insignificant. When the length is more than 70 mm, the physical properties are improved when mixed into concrete, A phenomenon (fiber ball) occurs and the dispersibility becomes poor.

Further, it is preferable that the staple fiber F "has an elastic modulus of 5 GPa to 10 GPa, a specific gravity of 0.9 g / cm3 to 0.92 g / cm3, and a tensile strength of 550 MPa to 650 MPa. The compressive strength and the bending tensile strength of the structural reinforced concrete composition are greatly improved because the flowability and dispersibility of the staple fiber (F ") improves within the concrete and the interfacial adhesion with the concrete is increased.

The thus-fabricated synthetic fiber puck (P) according to the present invention is contained in concrete or shotcrete and is used for reinforcing the structure. That is, when the structure-reinforcing synthetic fiber puck (P) of the present invention is put into concrete or shotcrete in the manufacturing step, the synthetic fiber puck (P) spreads evenly in the concrete or shotcrete. Then, the water-soluble film 10 wrapped on the outer surface of the synthetic fiber puck P is melted in the water mixed with the concrete or the shotcrete, and the respective short fibers F "are separated and dispersed from each other.

Therefore, the synthetic fiber puck (P) for structural reinforcement according to the present invention can prevent the tangling or aggregation of mixed concrete or shotcrete due to excellent dispersibility, thereby facilitating the pouring of concrete or shotcrete, There is an advantage that adhesion is improved.

In addition, the synthetic fiber puck (P) for structural reinforcement according to the present invention is advantageous for hygiene of workers because it does not generate scattered dust when mixed into concrete and shotcrete.

While the present invention has been particularly shown and described with reference to specific embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Anyone who can afford it will know.

100: extruder 200: water tank
310: first stretching part 320: second stretching part
400: M. View 500: Winder
611: Guide ring 612: Guide tube
613: pull roller 614: push roller
616: Focus tube 710: Focus die
720: Wrapping device 731: Cylinder
732: Cutter

Claims (4)

A synthetic resin melt extrusion step of injecting synthetic resin into a cylinder of the extruder and melt-extruding through a heated screw;
A synthetic fiber spinning step of spinning the melt extruded synthetic resin with synthetic fiber using a head nozzle of an extruder;
A synthetic fiber cooling step of transferring the synthetic fibers radiated into the water tub containing the cooling water to cool the synthetic fibers;
A synthetic fiber drawing step of heating the cooled synthetic fiber and stretching the synthetic fiber using a stretching roller;
An embossing step of embossing the concave-convex pattern on the synthetic fiber using the M-view;
A synthetic fiber winding step of winding synthetic fibers on a plurality of bobbins mounted on a spindle of a winder;
A synthetic fiber bundling step of bundling the synthetic fibers wound on a plurality of bobbins and feeding the bundles of synthetic fibers along the bundling rollers in multiple steps while converging the bundles so that the diameter of the synthetic fibers is reduced;
A synthetic fiber bundle wrapping step of wrapping and wrapping the outer surface of the bundled synthetic fiber bundle with a water-soluble film;
And a synthetic fiber puck manufacturing step of producing a synthetic fiber puck in which a plurality of short fibers are bundled by cutting a synthetic fiber bundle bundled with a water-soluble film to a predetermined length,
The synthetic fibers wound around the plurality of bobbins are guided through a guide ring and collected into a guide tube,
Wherein a guide roller is provided on the rear side of the guide tube and a supporting roller and a pressing roller are provided on the upper side between the guide tube and the pulling roller so that a synthetic fiber bundle fed from the guide tube to the pulling roller And is conveyed while being stretched while being moved to the upper side and the lower side of the press roller,
The synthetic fiber bundle passing through the pulling rollers is fed through a focusing tube and is gradually conveyed along a plurality of collecting rollers sequentially disposed on the rear side of the collecting tube to be converged while being reduced in diameter, Wherein the bundle of synthetic fibers is fed into and transported to a collecting groove between the upper collecting roller and the lower collecting roller and is concentrated while the collecting grooves of the collecting roller are located at the rear side Wherein the synthetic fiber bundle is gradually reduced in size as the fiber bundle is conveyed along the plurality of converging rollers as the fiber bundle is sequentially conveyed along the plurality of converging rollers.
The method according to claim 1,
The synthetic resin is melt-extruded through a screw heated to 170 ° C to 300 ° C,
The melt-extruded synthetic resin is spun into synthetic fibers through a head nozzle having a diameter of 1 mm to 5 mm,
Wherein the synthetic fibers are heated to a temperature of 150 to 170 캜 and stretched through the stretching roller to have a diameter of 0.3 to 1.0 mm,
The synthetic fiber puck is made of 300-3000 short fibers and has a length of 30 mm to 70 mm,
Wherein the staple fiber has an elastic modulus of 5 GPa to 10 GPa, a specific gravity of 0.9 g / cm3 to 0.92 g / cm3, and a tensile strength of 550 MPa to 650 MPa.
delete The method according to claim 1,
Wherein the bundle of synthetic fibers is fed into a bundle dice and fed, and the water-soluble film is wrapped on the outer surface of the bundle of synthetic fibers fed into the bundle dice through a lapping device provided outside the bundle dice,
The lapping device includes a rotating plate which is received on the outer surface of the focusing dice and receives a driving force of the motor, and a bobbin supporting bar protruded from one side of the rotating plate and in which a winding bobbin on which the water- The winding bobbin coupled to the bobbin support rods by the rotation of the rotation plate is pivoted about the longitudinal axis of the synthetic fiber bundle and the water-soluble film is unwound from the winding bobbin, so that a part of the width of the water- Wherein the synthetic fiber puck is continuously wrapped so as to bundle the synthetic fiber bundles.

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