KR100603476B1 - Plastic sheet material for visor of caps, preparation method therefor and caps using the same - Google Patents

Abstract

According to the present invention, there is provided a hat brim plate plastic material, a manufacturing method thereof, and a hat using the same, wherein the thermoplastic resin is extruded into a plate shape and stretched with a tension above the yield point to remove elasticity.

According to the present invention, the elasticity is removed by the plate-like plastic material, the wearer can be bent as much as the wearer wants, the curved state is maintained, there is no need to repeat the curve does not cause the problem of brim hat brim, When the plastic sheet is foamed, the weight of the hat may be reduced to obtain an effect of reducing the pressure applied to the wearer's head.

Cap, Visor, Plate Plastic, Elasticity Relief, Curving

Description

Plastic sheet material for visor of caps, preparation method therefor and caps using the same}

1 is a tensile characteristic curve of a general-purpose thermoplastic resin;

2 is a manufacturing process diagram schematically showing a manufacturing method of a hat-shaped core plastic plate material according to the present invention;

3 is a perspective view of a cap using a cap plastic plate-like plastic material according to the present invention.

** Description of symbols for the main parts of the drawing **

1, 2: plastic sheet 10: extruder

11 hopper 12 die

20: tank 30: reheating step

40: drawing step 41: shear drawing roller

42: rear drawing roller 50: cooling stage

60: hat 61: hat visor

62: the brim of the hat

The present invention relates to a plate-shaped plastic material for a hat brim, a manufacturing method thereof, and a hat using the same. More specifically, the present invention relates to a plate-like synthetic resin material, a manufacturing method thereof, and a hat using the same, in which the shape is maintained when the shape is adjusted to a desired shape such as a flat state and a thin state by removing the elasticity of the plastic plate-like material.

Generally, a hat consists of a rim that contacts the wearer's head and a hat body extending upwardly from the rim and a visor extending almost forward from the rim. The visor consists of a cap visor shim, usually made of a plastic plate, and a cover covering it.

The cap brim is generally used by bending a flat plastic plate by the method of sewing the cover, or by bending the plastic plate in advance. Meanwhile, the degree of curvature may be further added or the degree of curvature may be reduced according to the taste of the wearer. However, since the general plastic plate has elasticity, the curvature desired by the wearer is not maintained, but has a problem of returning to the original shape. In addition, the plastic brim may be broken when it is curved beyond the yield point in order to prevent restoration by elasticity.

In addition, although a plastic foam resin is used to reduce the weight of the hat brim to reduce the pressure exerted on the wearer's head by the weight of the hat, the bending state is still not maintained due to elasticity, and the bending is repeated. The problem is that the brim is broken.

Therefore, there has been a need to develop a light cap brim material that can freely adjust the shape of the cap brim to the curvature desired by the wearer.

The present invention is to solve the problems of such a conventional cap-shaped plate-like plastic material.

Specifically, it is an object of the present invention to provide a lightweight plate-like plastic material in which elasticity is removed to maintain a curved state.

Another object of the present invention is to provide a method for producing the plate-shaped plastic material.

Another object of the present invention to provide a cap using the plate-shaped plastic material.

According to the first object of the present invention, a hat-shaped core plastic material for hat brim is extruded into a plate-like thermoplastic resin that can be extruded and stretched to a tensile point or more at a yield point to remove elasticity.

The thermoplastic resin is not limited thereto, but may be preferably PE, PP, or a mixed resin thereof.

More preferably, a blended resin blended with 55 to 65 parts by weight of PP, 25 to 35 parts by weight of HDPE and 5 to 15 parts by weight of LDPE, most preferably a blend of 60 parts by weight of PP, 30 parts by weight of HDPE and 10 parts by weight of LDPE It may be a resin.

The extrusion method may be a plastic sheet processing method known in the art, for example, a T die extrusion method.

The plate-shaped plastic material of the present invention has plastic deformation characteristics by stretching (stretching) at a tension above the yield point.

1 shows the tensile characteristic curves at 20 ° C. of some general purpose resins (LDPE, HDPE, PP, PVC and PS) that can be used in the present invention. When the material is stretched beyond the yield point shown in Fig. 1, it has plastic deformation characteristics.

On the other hand, the plastic sheet of the present invention may be foamed to reduce the pressure applied to the head by the cap by reducing the weight of the cap brim shim. For example, about 5% of the cross-sectional area of the plastic sheet cut in the longitudinal direction may be an empty space due to pores.

According to a second aspect of the present invention, a method for manufacturing a cap rim core plastic material includes the following steps:

a) melting and extruding a thermoplastic resin to produce a plastic sheet;

b) cooling the plastic sheet;

c) reheating the cooled plastic sheet;

d) drawing the reheated plastic sheet; And

e) cooling the stretched plastic sheet.

Hereinafter, the manufacturing method of the plate-shaped plastic material for a cap visor core of this invention is demonstrated in detail with reference to FIG.

First, the step a) of melting and extruding the thermoplastic resin is preferably performed in an extruder, and as shown in FIG. 2, resin pellets are introduced into the hopper 11 of the extruder 10 to extruder ( Passing 10) melts the pellets in the extruder 10 and is molded into a plastic sheet 1 by a die 12 mounted on the outlet side of the extruder.

In the case of using a mixed resin, each pellet may be introduced into the hopper 11 at a desired weight ratio, but it is preferable to use mixed pellets melt-blended and extruded at a desired weight ratio in a master batch in advance, and the screw of the extruder 10 may be used. The pellets introduced by the external heating means while the pellets pass through the extruder by means of a screw feeder are melted and molded into the die 12 at the outlet, for example on a sheet about 800 mm wide and about 8 to 10 mm thick. do.

On the other hand, when the plastic sheet 1 is a foamed plastic sheet, a foaming agent and optionally, a pore dispersant for uniformly dispersing pores in the molten resin and stabilizing the pores are added together with the resin pellets, or they are previously added to the master batch. By mixing the pellets into a hopper to produce a plastic sheet. The blowing agent and pore dispersant may be any blowing agent and pore dispersant known in the art, for example, NaHCO ₃ or Ca-stearic acid esters, such as "AC5000" or "CL92" from Kumyang Chemical Co., Ltd. It is available under the trade name ", and can be used in the ratio of 0.1 to 0.2 weight% with respect to the weight of resin.

The plastic sheet 1 molded in this step is cooled in step b), preferably continuously through the sheet 1 into a water bath 20 containing hot water at about 80 ° C., so that the resin melt temperature, for example, In the case of the blended resin blended with 60 parts by weight of PP, 30 parts by weight of HDPE and 10 parts by weight of LDPE, the mixture is cooled to about 30 ° C. below the melting temperature of about 180 to 230 ° C. The above process steps can be seen in FIG. 2, which schematically shows a preparation method of the invention. This step forms a skin on the surface of the plastic sheet 1.

It is then heated in the reheating step c) 30 to impart the fluidity necessary for stretching (orientation) to the plastic sheet (step d). At this time, the temperature is about 20 to 30 ° C. higher than the melting temperature of the resin, for example, 60 parts by weight of PP, 30 parts by weight of HDPE, and 10 parts by weight of LDPE is mixed and reheated to about 200 to 250 ° C. Reheating can be accomplished by any method known in the art, for example, by passing a plastic sheet between electrothermal hot plates.

The reheated plastic sheet 1 is stretched by tension due to the speed difference between the front and rear rollers 41 and the rear extension rollers 42, and the plastic sheet 1 having a width of 800 mm and a thickness of 8 to 10 mm is 250 to width. It is stretched into a plastic sheet 2 of 300 mm and thickness of about 1.5 to 2 mm.

The stretched plastic sheet 2 is then subjected to cooling step e) 50. The cooling step may be carried out by any cooling scheme known in the art to which the present invention pertains, such as air cooling with cold air, spraying cold water or passing a plastic sheet through cold water.

The manufacturing method according to the second object of the present invention may be performed in a continuous process, as illustrated in Figure 2 may be performed in a batch process.

The cap according to the third object of the present invention is characterized in that in a conventional hat with a visor, the visor core uses a plate plastic composite material according to the first object of the present invention. At this time, the brim shim 62 of the cap 60, as illustrated in Figure 3, should be made so that the polymer chain arranged by stretching is arranged in the transverse direction relative to the front portion of the cap. The cap visor shim 62 may be made by cutting to fit the shape and size of the cap visor shim in the plate-like plastic sheet of the present invention.

Example

Manufacture of elasticized foamed plastic sheet

400 kg of resin resin pellets of 60 parts by weight of PP, 30 parts by weight of HDPE and 10 parts by weight of LDPE, and 600 g of a blowing agent sold under the trade name "AC5000" by Kumyang Chemical Co., Ltd. were melted at 200 ° C., and stirred and mixed for 2 hours. Extruded and manufactured into pellets of 0.5φx 0.5mm, put into an extruder for manufacturing sheets, and then pass through a hot water bath at 80 ° C while cooling a plastic sheet having a width of 800mm and a thickness of 8mm, and then cool the plastic sheet between two heating plates set at 260 ° C. After passing through the reheating to 240 ℃ to adjust the speed of the post-rolling roller was stretched to prepare a foamed plastic sheet of width 250mm, thickness 1.5mm. The plastic sheet thus prepared did not recover to its original state when the elastic sheet was removed by the elasticity, and thus maintained the curved state.

According to the present invention, the elasticity is removed by the plate-like plastic material, the wearer can be bent as much as the wearer wants, the curved state is maintained, there is no need to repeat the curve does not cause the problem of brim hat brim, By foaming, the weight of the hat can be reduced to obtain the effect of reducing the pressure on the wearer's head.

Claims (12)

Plate-shaped plastic material for the cap visor core from which the thermoplastic sheet was removed. The hat brim core plastic material of claim 1, wherein the hat brim core plastic material is removed by elasticity by stretching the plastic sheet extruded into a plate with a tension of the yield point or more. 3. The plate-shaped plastic material for cap brim according to claim 2, wherein the thermoplastic resin is PE, PP or a mixed resin thereof. According to claim 3, wherein the mixed resin is 55 to 65 parts by weight of PP, 25 to 35 parts by weight HDPE and 5 to 15 parts by weight of LDPE blended plate-shaped plastic material for the cap brim. 5. The plate-shaped plastic material for cap brim according to claim 4, wherein the mixed resin is a blend of 60 parts by weight of PP, 30 parts by weight of HDPE, and 10 parts by weight of LDPE. 6. The cap brim core plastic material according to any one of claims 1 to 5, wherein the cap brim core plastic material is foamed. 7. The plate-shaped plastic material for hat brim according to claim 6, wherein 5% of the cross-sectional area cut in the longitudinal direction of the foamed plastic material is an empty space caused by pores. a) melting and extruding a thermoplastic resin to produce a plastic sheet; b) cooling the plastic sheet; c) reheating the cooled plastic sheet; d) drawing the reheated plastic sheet; And e) A method for producing a hat-shaped core plastic material according to any one of claims 1 to 5, comprising cooling the stretched plastic sheet. The method of claim 8, wherein the step a) is performed by adding a foaming agent together with a thermoplastic resin. The method of claim 9, wherein the thermoplastic resin and the blowing agent are added in a premixed state in a master batch. The method according to claim 10, wherein the blowing agent is mixed in a ratio of 0.1 to 0.2% by weight based on the weight of the thermoplastic resin. A hat comprising a cap brim made of a plate plastic material according to any one of claims 1 to 5 and 7.

Images