JP4660285B2 - Shape retaining sheet, composite shape retaining sheet, core material for hat collar, hat collar and hat - Google Patents

Description

The present invention relates to a shape-retaining sheet excellent in shape-retaining property , a composite shape-retaining sheet obtained by laminating shape-retaining sheets, a core material for a hat collar, a hat collar, and a hat using the same.

  In the present specification, “shape retention” refers to a state in which a user can freely deform by hand to form a desired shape and maintain that state.

  Traditionally, hats are made of cloth, and their collars are made by laminating and sewing a plurality of cloths, but since cloth gets wet when it rains and absorbs rainwater, it becomes heavier and deforms. Synthetic resin hats and hats made of synthetic resin only on the collar are used.

For example, the core material of the eaves part is made of a low foamed PE plate, and the eaves part is formed into a curved surface shape by heating and pressing and is “shaped-retained” by rapid cooling. A cap has been proposed (see, for example, Patent Document 1).
JP 2004-218120 A

  However, unlike the shape retention defined in the present invention, the cap portion of the cap is merely hot-pressed and rapidly cooled. There is a drawback that the processing cost is high because the shape needs to be pressed.

  Moreover, it is also possible to use a uniaxially stretched sheet such as polyethylene resin as the core material. However, when a hisashi with the uniaxially stretched sheet as a core material is bent along the uniaxially stretched direction, a bursting sound “crisp” is heard. , And had the disadvantage of bending or breaking.

In view of the above-mentioned drawbacks, the object of the present invention is to have a sufficient shape retaining property that allows a user to easily give a desired shape, and even when bent in a direction parallel to the axial direction, it generates a bursting sound and bends. An object of the present invention is to provide a shape-retaining sheet that does not need to undergo a pressing process for imparting a curved shape.

  Another object of the present invention is that the user has sufficient shape-retaining ability to easily give a desired shape, and does not bend or break with a bursting sound of “crisp” even when bent. An object of the present invention is to provide a composite shape-retaining sheet, a core material for a cap collar, a cap collar and a cap using the composite shape-retaining sheet.

In the shape-retaining sheet of the present invention, a synthetic resin sheet having a shape-retaining property and a film-like body are laminated in a uniaxial direction, and a plurality of the shape-retaining sheets are provided at intervals of 5 mm or less substantially parallel to the axial direction having the shape-retaining property. The synthetic resin sheet is a uniaxially stretched resin sheet having a total stretch ratio of 10 to 40 times that of a high density polyethylene resin sheet having a weight average molecular weight of 200,000 to 500,000, and is in the form of a film. The body is characterized by being a substantially unstretched low density polyethylene resin or a linear low density polyethylene resin film .

The synthetic resin sheet is a sheet having shape retention in a uniaxial direction, and any material can be used as long as the sheet can retain its shape when folded, but a lightweight and sanitary material is preferable, A uniaxially stretched high-density polyethylene resin sheet having a total stretch ratio of 10 to 40 is used.

The uniaxially stretched high-density polyethylene resin sheet is preferably stretched to a high degree of 10 to 40 times and exhibits high shape retention by stretching. However, when the density of the high-density polyethylene resin is reduced, high shape retention is achieved. 0.94 g / cm ³ or more is preferable because it is difficult to stretch at a high magnification.

The weight average molecular weight of the high-density polyethylene resin is 200,000 to 500,000 because it becomes difficult to form an unstretched raw material by extrusion molding if it becomes too small, and if it becomes too large, it becomes difficult to form or stretch the film . The melt index (MI) is preferably 0.1 to 20 and more preferably 0.2 to 10 because the film formability is excellent.

If the total draw ratio of the uniaxially stretched resin sheet is small, the shape retention is not improved , and if it is large , it tends to tear laterally, so it is 10 to 40 times , preferably 10 to 30 times.

Conventionally known arbitrary methods may be adopted as the method for stretching the high-density polyethylene resin sheet, but since it is highly stretched by 10 to 40 times, after the high-density polyethylene resin sheet is rolled, it is uniaxially stretched or uniaxially stretched. A method in which multistage uniaxial stretching is repeated a plurality of times is preferable.

That is, after the rolled to the rolling ratio is 5 to 10 times, was uniaxially stretched to the draw ratio is 1.3 to 4 times, a high-density polyethylene resin total draw ratio was made 10 to 40 times Sheets are preferred. The total draw ratio refers to the product of the rolling ratio and the draw ratio.

The rolling is supplied to roll rotating high-density polyethylene resin sheet to a pair of opposite directions, to press a method of extending as well as the thickness of the sheet, it rolled sheet is different from the stretched sheet, high Since the density polyethylene resin is dense without being oriented, it is highly stretchable.

When the rolling temperature is lowered, it cannot be uniformly rolled, and when it is raised, it is melt-cut. Therefore, the roll temperature at the time of rolling is from “melting point −40 ° C.” to “melting point” of the high-density polyethylene resin of the high- density polyethylene resin sheet to be rolled. The range is preferably “melting point−30 ° C.” to “melting point−5 ° C.” of the high-density polyethylene resin .

  In the present invention, the melting point refers to the maximum point of the endothermic peak that accompanies melting of the crystal, which is recognized when thermal analysis is performed with a differential scanning calorimeter (DSC).

  Further, if the rolling ratio is small, a subsequent uniaxial stretching is burdened, and increasing the rolling ratio is difficult because rolling becomes difficult. In the present invention, the rolling ratio and the stretching ratio are values obtained by grading the cross-sectional area of the sheet before rolling or stretching by the cross-sectional area of the sheet after rolling or stretching.

  The uniaxial stretching may be any conventionally known method, and examples thereof include a method of stretching while heating with a heater or hot air by a roll stretching method or a zone stretching method.

The stretching temperature cannot be uniformly stretched when the temperature is lowered, and the sheet melts and cuts when the temperature is increased. Therefore, the range of “melting point−60 ° C.” to “melting point” of the high- density polyethylene resin of the stretched high-density polyethylene resin sheet is preferable. Preferably, they are “melting point−50 ° C.” to “melting point−5 ° C.” of the high-density polyethylene resin .

  In addition, since the total draw ratio is 10 to 40 times, the draw ratio may be determined so that the total draw ratio is within this range in consideration of the rolling ratio. If it is not improved and the stretch ratio is large, the sheet will be laterally cracked or make noise when it is bent. Therefore, the ratio is preferably 1.3 to 4 times, more preferably 1.5 to 3 times.

When the uniaxially stretched high-density polyethylene resin sheet becomes thin, the mechanical strength decreases. When the uniaxially stretched high-density polyethylene resin sheet becomes thick, the uniaxially stretched high-density polyethylene resin sheet tends to crack in the stretching direction. 5 mm.

In the synthetic resin sheet, a plurality of cuts or creases are formed at intervals of 5 mm or less substantially parallel to the axial direction having shape retention.
The said cut | interruption may be formed through the synthetic resin sheet, and may be formed so that it may not penetrate. Further, the cut line may be formed only on one surface of the synthetic resin sheet or may be formed on both surfaces. Further, the direction of the fold is not particularly limited, and examples thereof include folds that are all in the same plane direction, folds that are alternately folded in different plane directions, and folds that are randomly folded.

  When the synthetic resin sheet is bent substantially parallel to the axial direction having shape retention, if the gap or crease interval is wider than 5 mm, it will bend or break with a rupturing sound called `` crisp '', A plurality of cuts or folds are provided at intervals of 5 mm or less, and the interval of the cuts or folds is preferably 3 mm or less, more preferably 0.5 to 2 mm.

  The film-like body is laminated on the synthetic resin sheet in order to prevent it from being bent or broken by making a bursting sound when the synthetic resin sheet is bent substantially parallel to the axial direction having shape retention. Is done. Accordingly, the film-like body preferably has a small tensile elastic modulus and is preferably thin, the tensile elastic modulus is preferably 1 GPa or less, and the thickness is preferably 0.005 to 0.1 mm.

Moreover, since it is preferable that the film-like body is firmly bonded to the synthetic resin sheet, a low-density polyethylene resin or a linear low-density polyethylene resin film is used .

As described above, since the film-like body preferably has a lower bending elastic modulus , a substantially unstretched film is used . The substantially unstretched film includes a film stretched during production. For example, a film produced by the inflation method is slightly stretched during inflation, but is substantially included in an unstretched film.

  The manufacturing method of the shape-retaining sheet of the present invention is not particularly limited, but has a shape-retaining property in a uniaxial direction when manufacturing a shape-retaining sheet in which a cut is formed in the synthetic resin sheet. The synthetic resin sheet is laminated with a step of slitting at intervals of 5 mm or less substantially parallel to the axial direction having shape-retaining properties to form a plurality of cuts, and a synthetic resin sheet having shape-retaining properties and a film-like body in a uniaxial direction. It is preferable to consist of the process to adhere | attach.

  As a method of forming a plurality of cuts by slitting a synthetic resin sheet having shape retention in one axis direction at intervals of 5 mm or less substantially parallel to the axis direction having shape retention, any conventionally known method is adopted. Well, for example, by pressing a synthetic resin sheet having shape retaining property in a uniaxial direction to a roll or a cutter in which cutting blades are installed at intervals of 5 mm or less so as to be substantially parallel to the axial direction, the axial direction And a method of forming a plurality of cuts.

  As a method of laminating and adhering the synthetic resin sheet and the film-like body, any conventionally known laminating and adhering method may be adopted. For example, the synthetic resin sheet and the film-like body are overlapped, and rubber, acrylic, urethane Adhesive with adhesives and adhesives such as silicone and silicon, adhesive with hot-melt adhesives such as ethylene-vinyl acetate copolymer and linear low density polyethylene resin, between synthetic resin sheet and film For example, a method of laminating a low melting point resin such as a linear low density polyethylene resin and heat-sealing it may be used. If the adhesive or pressure-sensitive adhesive is too hard, the shape-recovering force is strong against the shape-retaining property of the synthetic resin sheet, and the above-mentioned relatively soft materials are preferably used.

When bonding with a hot melt adhesive, the hot melt adhesive may be melted and bonded while being applied, or a hot melt adhesive sheet may be laminated and bonded while being heated and pressed. When the heating temperature is increased, the synthetic resin sheet shrinks. Therefore, the temperature at which the synthetic resin sheet does not substantially heat shrink, that is, the “melting point−10 ° C.” or less of the high-density polyethylene resin constituting the synthetic resin sheet It is preferable that they are bonded with each other.

  The order of the step of forming the cut and the step of laminating and adhering may be first, and after the cut is provided in the synthetic resin sheet, the synthetic resin sheet and the film-like body may be laminated and bonded, or the synthetic resin sheet After the film-like body is laminated and adhered, a cut may be provided in the synthetic resin sheet.

  When manufacturing a shape-retaining sheet in which a crease is formed in the synthetic resin sheet, the synthetic resin sheet having shape-retaining property in a uniaxial direction has an interval of 5 mm or less substantially parallel to the axial direction having shape-retaining property. A method of laminating and adhering to a film-like body after forming a plurality of creases is preferable.

  The method for forming the folds in the synthetic resin sheet is not particularly limited, but it is preferable that the folds are formed in the synthetic resin sheet at equal intervals.

  The bending device is composed of two rolls in which a plurality of ridges and ridges parallel to the rotation direction are alternately formed, and is arranged so that the ridge of one roll enters the groove of the other roll. A folding apparatus for forming a crease in the synthetic resin sheet is preferably provided.

  Next, a bending apparatus for forming a crease in the synthetic resin sheet will be described with reference to the drawings. FIG. 1 is a side view showing an example of a bending apparatus for forming a crease in a synthetic resin sheet, and FIG. 2 is an enlarged cross-sectional view of a main part.

  In the figure, 1 is an upper roll and 2 is a lower roll. On the upper roll 1, a plurality of ridges 11, 11,... And ridges 12, 12,. A plurality of ridges 21, 21... And recesses 22, 22,... Parallel to the rotation direction of the roll are also alternately formed on the lower roll 2. In order to form an appropriate crease in the synthetic resin sheet, the ridges 21 are preferably 0.05 to 1 mm, more preferably 0.1 to 0.00 mm, from the line connecting the ridges 11 and 11 adjacent to each other. It is preferable to be installed so as to enter the 5 mm concave strip 12 side.

The ridges 11 and 21, and the ridges 12 and 22 have substantially the same shape, and are installed so that the ridges 11 enter the recesses 22 and the ridges 21 enter the recesses 12. . The interval between the upper roll 1 and the lower roll 2 (the interval between the ridges 11 and 22, and the interval between the ridges 21 and 12) may be appropriately determined so that a crease is formed in the synthetic resin sheet to be bent. Generally, the thickness of the synthetic resin sheet to the thickness of the synthetic resin sheet + 2 mm is preferable.

  Further, the pitch of the ridges 11 and the ridges 21 is the same, and creases are formed at intervals of 5 mm or less, so that the height is 10 mm or less, and the height can be appropriately determined depending on the thickness of the synthetic resin sheet to be folded. In general, 2 to 5 mm is preferable.

  FIG. 3 is an enlarged cross-sectional view of a main part of a different bending apparatus. On the upper roll 1 ′, a plurality of ridges 13, 13... And recesses 14, 14... Parallel to the rotation direction of the roll are alternately formed. A plurality of ridges 23, 23... And recesses 24, 24... Parallel to the rotation direction of the roll are also formed alternately on the lower roll 2 ′.

  The ridges 13 are installed so as to enter the recesses 24 and the ridges 23 enter the recesses 14. The pitch of the ridges 13 and the ridges 23 is the same, but the ridges 13 are made higher than the ridges 23, and the folds are formed only by the ridges 13.

  Since the creases are formed at intervals of 5 mm or less, the pitch between the ridges 13 and the ridges 23 is 5 mm or less. The heights of the ridges 13 and the ridges 23 may be appropriately determined depending on the thickness of the synthetic resin sheet to be bent, but the height of the ridges 13 is generally preferably 2 to 5 mm, and the height of the ridges 23 is the ridges. It is 0.5 mm or more lower than the height of 13 and preferably 1 to 2 mm.

The interval between the upper roll 1 ′ and the lower roll 2 ′ (interval between the ridges 13 and the ridges 24) may be appropriately determined so that a fold is formed in the synthetic resin sheet to be bent. The thickness of the synthetic resin sheet is preferably +1 mm . In order to form an appropriate crease in the synthetic resin sheet, the ridges 13 are preferably 0.05 to 1 mm, more preferably 0.1 to 0.00 mm, from the line connecting the ridges 23 and 23 adjacent to each other. It is preferable to be installed so as to enter the 5 mm concave line 24 side.

  Further, the pitch of the ridges 13 and the ridges 23 is the same, and the creases are formed at intervals of 5 mm or less. Therefore, the height is 10 mm or less, and the height is appropriately determined depending on the thickness of the synthetic resin sheet to be folded. In general, 2 to 5 mm is preferable.

  FIG. 4 is an enlarged cross-sectional view of the main part of a further different bending apparatus. The upper roll 1 "has a plurality of sharp ridges 15, 15 ... and concave ridges 16, 16 ... formed alternately on the tip parallel to the roll rotation direction. The lower roll 2" also has a roll. Are formed alternately with a plurality of flat ridges 25, 25,... Parallel to the rotational direction of the ridges.

  The ridges 15 are installed so as to enter the recesses 26 and the ridges 25 enter the recesses 16. The pitch of the ridges 15 and the ridges 26 is the same, the ridges 15 are made higher than the ridges 25, and the folds are formed only by pressing the synthetic resin sheet with the ridges 15.

  Since the creases are formed at intervals of 5 mm or less, the pitch between the ridges 15 and the ridges 26 is 5 mm or less. The heights of the ridges 15 and the ridges 25 may be appropriately determined depending on the thickness of the synthetic resin sheet to be bent, but the height of the ridges 15 is generally preferably 2 to 5 mm, and the height of the ridges 25 is the ridges. It is preferably 0.5 mm or more lower than 15 and 1 to 2 mm.

The interval between the upper roll 1 "and the lower roll 2" (the interval between the ridges 15 and the recesses 26) may be appropriately determined so that a fold is formed in the synthetic resin sheet to be bent. The thickness of the synthetic resin sheet is preferably +1 mm . In order to form an appropriate crease in the synthetic resin sheet, the ridge 15 is preferably 0.05 to 1 mm, more preferably 0.1 to 0.00 mm, from the line connecting the ridges 25 and 25 adjacent to each other. It is preferable to be installed so as to enter the 5 mm concave line 26 side.

  The upper roll 1 and the lower roll 2 may be fixed or may be fixed rotatably. In this case, a synthetic resin sheet is supplied between the upper roll 1 and the lower roll 2 and pulled out. A crease can be formed in the synthetic resin sheet.

  In addition, a driving device may be connected to at least one of the upper roll 1 and the lower roll 2 and at least one of the upper roll 1 and the lower roll 2 may be used as a driving roll. A crease can be formed in the synthetic resin sheet while being supplied between the lower rolls 2 and transported by a drive roll.

  The method for laminating and adhering the synthetic resin sheet formed with a plurality of folds and the film-like body is not particularly limited, and for example, there is a method for laminating and adhering the synthetic resin sheet and the film-like body formed with the aforementioned cuts. Can be mentioned.

  As a different manufacturing method of the shape-retaining sheet in which folds are formed in the synthetic resin sheet, after obtaining a laminated sheet by laminating and bonding a synthetic resin sheet having a shape-retaining property and a film-like body in a uniaxial direction, A preferred method for producing a shape-retaining sheet is characterized in that the laminated sheet is bent at intervals of 5 mm or less substantially parallel to a uniaxial direction having shape-retaining properties, and a plurality of creases are formed in the synthetic resin sheet.

  The method for obtaining a laminated sheet by laminating and adhering a synthetic resin sheet having a shape-retaining property and a film-like body in a uniaxial direction is not particularly limited. For example, the synthetic resin sheet and the film-like body on which the above-described cuts are formed are used. The method of laminating and adhering is mentioned.

  A method for forming a crease in the obtained laminated sheet is not particularly limited, but it is preferable to form the crease with a folding apparatus since it is preferably provided uniformly at equal intervals in the laminated sheet.

The bending device is composed of two rolls in which a plurality of ridges and ridges parallel to the rotation direction are alternately formed, and is arranged so that the ridge of one roll enters the groove of the other roll. The apparatus provided is preferable and the bending apparatus for forming a crease | fold in the above-mentioned synthetic resin sheet is preferable.

  In the composite shape-retaining sheet of the present invention, a plurality of the shape-retaining sheets are laminated and bonded so that the axial directions (stretching directions) having the shape-retaining properties of adjacent synthetic resin sheets form a predetermined angle.

  When the predetermined angle becomes smaller, the difference in the axial direction (stretching direction) of the synthetic resin sheets to be laminated becomes smaller, the axes are directed in the same direction, and exhibit shape retention when bent in a direction perpendicular to the axial direction. 45 to 90 degrees is preferable, and 90 degrees is more preferable.

  The number of the shape-retaining sheets may be appropriately determined depending on the use and the thickness of the shape-retaining sheet, and generally 2 to 16 sheets are preferably laminated.

  The shape-retaining sheet is laminated / adhered, and as a method of laminating / adhering, any conventionally known laminating / adhering method may be employed, for example, by superposing the shape-retaining sheets, a rubber system, Adhesion with acrylic, urethane, silicon, etc. adhesives and adhesives, Adhesion with hot melt adhesives such as ethylene-vinyl acetate copolymer, linear low density polyethylene resin, between shape-retaining sheets And a method of laminating a low melting point resin such as a linear low density polyethylene resin and thermally fusing it.

When bonding with a hot melt adhesive, the hot melt adhesive may be melted and bonded while being applied, or a hot melt adhesive sheet may be laminated and bonded while being heated and pressed. When the heating temperature increases, the synthetic resin sheet of the shape-retaining sheet contracts. Therefore, the temperature at which the synthetic resin sheet does not substantially heat contract, that is, the “melting point of the high-density polyethylene resin constituting the synthetic resin sheet. Adhesion is preferably performed at -10 ° C or lower. The same applies to the method of laminating a low melting point resin between the shape-retaining sheets and heat-sealing.

  Since the composite shape-retaining sheet of the present invention has shape-retaining properties in both the vertical direction and the horizontal direction, it can be suitably used as a core material for the cap collar.

  The collar of the hat of the present invention is formed by covering the core material for the collar of the hat with a coating material. As the covering material, any conventionally known covering material used when manufacturing a hat can be used, and examples thereof include cloth, olefin resin sheet, vinyl chloride resin sheet, and nonwoven fabric.

  As a method of coating the core material for the cap collar with the above-described coating material, any conventionally known method may be adopted. For example, the core material for the collar of the hat is coated with the coating material, and rubber, acrylic, urethane is used. Examples thereof include a method of adhering with an adhesive or a pressure sensitive adhesive such as a silicone type, a method of adhering with a hot melt type adhesive such as an ethylene-vinyl acetate copolymer or a linear low density polyethylene resin, and a method of sewing.

  The hat of the present invention is formed by installing the collar of the hat on the hat body. As a hat main body, the conventionally well-known arbitrary hat main body currently used when manufacturing a hat can be used, For example, a cloth, an olefin resin sheet, a vinyl chloride resin sheet, a nonwoven fabric, a straw, etc. are mentioned.

  As for the method of installing the cap collar on the cap body, any conventionally known method may be adopted. For example, the cap collar is installed on the cap body, and rubber-based, acrylic-based, urethane-based, silicon-based, etc. Examples thereof include a method of bonding with an adhesive or a pressure-sensitive adhesive, a method of bonding with a hot-melt adhesive such as an ethylene-vinyl acetate copolymer and a linear low density polyethylene resin, and a method of sewing.

The configuration of the shape-retaining sheet of the present invention is as described above, and does not bend or break with a bursting sound even when bent, without requiring a press working step for imparting a curved shape, It has sufficient shape retention that allows the user to give a desired shape, and is lightweight and hygienic.

  The configuration of the composite shape-retaining sheet of the present invention is as described above, and even when bent, it does not generate a crispy plosive sound and does not bend or break, and does not require a pressing process for imparting a curved shape. , It has sufficient shape retentivity that allows the user to give a desired shape, and is lightweight and hygienic.

  The configuration of the core material for the cap of the hat of the present invention is as described above, and is composed of the composite shape-retaining sheet, so that the user has sufficient shape-retaining ability to give a desired shape, and is bent. It is light and does not bend or break with a bursting sound. Also, since it does not absorb sweat or rainwater, it does not become heavy even if it is sweated or used in the rain, and it is hygienic.

  Accordingly, the brim of the hat and the hat of the present invention also have sufficient shape retention that allows the user to give a desired shape, and even when bent, it does not bend or break with a crispy bursting sound, Since it is lightweight and does not absorb sweat or rainwater, it does not become heavy even when sweated or used in the rain, and is hygienic.

  EXAMPLES Next, although an Example is given and this invention is demonstrated in detail, this invention is not limited to an Example.

Example 1
A high-density polyethylene resin (manufactured by Nippon Polyethylene Co., Ltd.) having a weight average molecular weight (Mw) of 3.3 × 10 ⁵ and a melting point of 135 ° C. is supplied to the same-direction twin-screw kneading extruder (manufactured by Plastic Engineering Laboratory), and the resin temperature is 200 After melt-kneading at 0 ° C., the melt-kneaded product was formed into a sheet having a width of 340 mm and a thickness of 2.7 mm using a calender molding machine controlled at a roll temperature of 110 ° C. to obtain a polyethylene resin sheet.

  The obtained polyethylene resin sheet was rolled at a rolling magnification of 9.4 times using a rolling molding machine (manufactured by Sekisui Koki Co., Ltd.) heated to 120 ° C. to obtain a rolled sheet having a width of 340 mm and a thickness of 290 μm.

  The obtained rolled sheet is subjected to 3.0-fold multi-stage uniaxial stretching with a hot-air heating type multi-stage stretching apparatus (manufactured by Kyowa Engineering) heated to 110 ° C., a total stretching ratio of 28.2 times, a width of 203 mm, and a thickness. A 160 μm stretched polyethylene resin sheet was obtained. The obtained stretched polyethylene resin sheet was bent by about 90 ° by hand in the stretching direction and held for 10 seconds, and when the force was released, the shape bent by about 90 ° was held.

  The obtained stretched polyethylene resin sheet was cut at intervals of 2 mm substantially parallel to the stretching direction with a cutter knife to form cuts. A linear low-density polyethylene resin sheet (manufactured by Sekisui Film Co., Ltd.) having a melting point of 120 ° C., a width of 190 mm, and a thickness of 30 μm is formed on one surface of a stretched polyethylene resin sheet formed with a cut using a film fusion apparatus (manufactured by Konan Design Industry). A shape-retaining sheet having a thickness of 190 μm was obtained by heat-sealing the tensile modulus (0.12 Ga) with a 160 ° C. heating roll (sheet temperature: 125 ° C.).

  The obtained shape-retaining sheet was bent at about 90 ° by hand in the stretching direction and held for 10 seconds, and then the force was released to hold the shape bent at about 90 °. Further, it was bent by about 90 ° by hand in a direction perpendicular to the stretching direction, but no crisp sound was generated and no breakage occurred.

(Example 2)
The stretched polyethylene resin sheet obtained in Example 1 is supplied to the bending apparatus shown in FIGS. 1 and 2, and is passed between the upper roll 1 and the lower roll 2, so that the stretch direction of the stretched polyethylene resin sheet is substantially the same. A stretched polyethylene resin sheet that was parallel and formed with creases at intervals of 2 mm was obtained.

  The upper roll 1 and the lower roll 2 are rotatable, the pitch of the ridges 11 and 21 is 4 mm, the height is 4 mm, and the ridges 21 of the lower roll 2 are adjacent to each other on the upper roll 1. It is installed so that it may penetrate | invade into the concave strip 12 side of 170 micrometers upper roll 1 from the line which ties.

  A linear low density polyethylene resin sheet having a melting point of 120 ° C., a width of 190 mm, and a thickness of 30 μm is formed on one surface of a stretched polyethylene resin sheet on which the obtained folds are formed, using a film fusion device (manufactured by Konan Design Industry Co., Ltd.). A shape-retaining sheet having a thickness of 190 μm was obtained by heat-sealing a film made by Film Co., Ltd. (tensile modulus 0.12 Ga) with a 160 ° C. heating roll (sheet temperature 125 ° C.).

  The obtained shape-retaining sheet was bent at about 90 ° by hand in the stretching direction and held for 10 seconds, and then the force was released to hold the shape bent at about 90 °. Further, it was bent by about 90 ° by hand in a direction perpendicular to the stretching direction, but no crisp sound was generated and no breakage occurred.

(Example 3)
A linear low density polyethylene resin sheet (sekisui film) having a melting point of 120 ° C., a width of 190 mm, and a thickness of 30 μm is formed on one surface of the stretched polyethylene resin sheet obtained in Example 1 using a film fusion device (manufactured by Konan Design Industries). A laminate sheet having a thickness of 190 μm was obtained by thermal fusion (sheet temperature: 125 ° C.) with a 160 ° C. heating roll.

  In the same manner as in Example 2, the obtained laminated sheet was supplied to a folding apparatus to form a crease having a 2 mm interval substantially parallel to the stretching direction of the stretched polyethylene resin sheet to obtain a shape-retaining sheet. . In addition, the protruding item | line 21 of the lower roll 2 was installed so that it might penetrate | invade into the concave item | line 12 side of the 200 micrometer upper roll 1 from the line | wire which connects the adjacent protruding item | line 11 and 11 of the upper roll 1. FIG.

  The obtained shape-retaining sheet was bent at about 90 ° by hand in the stretching direction and held for 10 seconds, and then the force was released to hold the shape bent at about 90 °. Further, it was bent by about 90 ° by hand in a direction perpendicular to the stretching direction, but no crisp sound was generated and no breakage occurred.

Example 4
The four shape-retaining sheets obtained in Example 1 were stretched so that stretched polyethylene resin sheets and linear low-density polyethylene resin sheets alternately overlap, and the stretch directions of adjacent stretched polyethylene resin sheets were substantially orthogonal to each other. The composite shape-retaining sheet having a thickness of 760 μm was obtained by heat-sealing with a press machine at 120 ° C. and 5.0 kg / cm ² for 30 seconds.

  The obtained composite shape-holding sheet was bent by hand at approximately 90 ° and held for 10 seconds, and then the force was released to hold the shape bent at approximately 90 °. Further, when it was bent, no crispy sound was generated and it did not break.

(Example 5)
The four shape-retaining sheets obtained in Example 2 were heat-sealed in the same manner as in Example 4 to obtain a composite shape-retaining sheet having a thickness of 760 μm. The obtained composite shape-holding sheet was bent by hand at approximately 90 ° and held for 10 seconds, and then the force was released to hold the shape bent at approximately 90 °. Further, when it was bent, no crispy sound was generated and it did not break.

(Example 6)
The four shape-retaining sheets obtained in Example 3 were heat-sealed in the same manner as in Example 4 to obtain a composite shape-retaining sheet having a thickness of 760 μm. The obtained composite shape-holding sheet was bent by hand at approximately 90 ° and held for 10 seconds, and then the force was released to hold the shape bent at approximately 90 °. Further, when folded, no crisp sound was generated and no breakage occurred.

(Example 7)
The composite shape-retaining sheets obtained in Examples 4 to 6 were supplied to a punching machine equipped with a Thomson blade, and punched into the shape of a cap collar to obtain a core material for the cap collar. Cloth was laminated on both sides of the core material for the obtained brim of the hat and stitched to obtain the brim of the hat, and the hat body was stitched to obtain the hat.

  The obtained core material of the hat collar and the collar of the hat were bent at approximately 90 ° by hand and held for 10 seconds, and when the force was released, the shape bent at approximately 90 ° was held. Further, when folded, no crisp sound was generated and no breakage occurred.

(Comparative Example 1)
A shape-retaining sheet having a thickness of 190 μm was obtained in the same manner as in Example 1 except that no cut was formed in the stretched polyethylene resin sheet, and a composite shape-retaining sheet was obtained in the same manner as in Example 4.

  The obtained composite shape-holding sheet was bent by about 90 ° by hand in the stretching direction and held for 10 seconds, and then the force was released to hold the shape bent by about 90 °. However, a crisp sound was generated when bending.

(Comparative Example 2)
Using the composite shape-retaining sheet obtained in Comparative Example 1, a core material for a hat collar, a hat collar and a hat were obtained in the same manner as in Example 7. The hat brim was folded by hand to approximately 90 ° and held for 10 seconds, and then the force was released to retain the shape bent to approximately 90 °, but a crispy sound was generated when folded.

It is a side view which shows an example of the bending apparatus for forming a crease | fold in a synthetic resin sheet. It is an expanded sectional view of the principal part. It is an expanded sectional view of the principal part of a different bending apparatus. It is an expanded sectional view of the principal part of a different bending apparatus.

DESCRIPTION OF SYMBOLS 1 Upper roll 2 Lower roll 11, 13, 15, 21, 23, 25 Convex 12, 14, 16, 22, 24, 26 Concave

Claims (8)

Uniaxially synthetic resin sheet and a film-like member having a shape retaining property is laminated, a plurality of which cut or fold is formed in the axial direction substantially parallel to the following interval 5mm having a shape retaining property to the synthetic resin sheet The synthetic resin sheet is a uniaxially stretched resin sheet having a total stretch ratio of 10 to 40 times of a high density polyethylene resin sheet having a weight average molecular weight of 200,000 to 500,000, and the film-like body is substantially unstretched. A shape-retaining sheet, which is a low-density polyethylene resin or a linear low-density polyethylene resin film . The shape-retaining sheet according to claim 1 , wherein the total stretching ratio is 10 to 40 times, and the rolling ratio is 5 to 10 times and the stretching ratio is 1.3 to 4 times. The shape-retaining sheet according to claim 1 or 2, wherein the film-like body has a tensile elastic modulus of 1 GPa or less. The shape-retaining sheet according to claim 1, 2 or 3 , wherein the synthetic resin sheet has a thickness of 0.05 to 1 mm, and the film-like body has a thickness of 0.005 to 0.1 mm. The shape-retaining sheet according to any one of claims 1 to 4 , wherein a plurality of laminated plastic sheets are bonded so that the axial directions having the shape-retaining characteristics of adjacent synthetic resin sheets form a predetermined angle. Composite shape retaining sheet. A core material for a brim of a hat, comprising the composite shape-retaining sheet according to claim 5 . A hat collar, wherein the core material for the hat collar according to claim 6 is coated with a covering material. A hat according to claim 7, wherein the hat collar is installed in the hat body.

Images