JP2008104671A - Shoe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a shoe retaining the shape of an access opening, a heel portion, an instep portion, and a toe portion without deformation, readily returned to an original shape and retaining the shape even if it is deformed, and hardly damaging the foot and giving a reduced pain even if the foot hits against a bed or wall. <P>SOLUTION: The shoe is formed with the access opening at the instep portion, wherein a shape-retaining sheet is made of a uniaxially stretched polyolefin-based resin sheet obtained by rolling a polyolefin-based sheet having a weight average molecular weight of 100,000-500,000 at a rolling ratio of ≥5 times and uniaxially stretching the sheet at a total draw ratio of 10-40 times, and the peripheral edge part of the access opening is embedded or laid with the shape-retaining sheet so that the direction of the peripheral edge part is substantially parallel with the uniaxially stretching direction of the shape-retaining sheet. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a shoe, and more particularly to an excellent shoe made of shape retention.

  A shoe generally includes a shoe sole and an upper part, and forms a mouth for opening the upper part to insert a foot, and is provided with a tongue piece, a fastener, and the like as necessary. In order to put on shoes, you had to open the mouth and insert your feet, but if the upper part was soft, once it was opened by hand, it would return to its original shape and become difficult to wear.

In order to remedy this drawback, in a shoe that opens and removes a notch formed in front of the upper, a shape-retaining material is incorporated into a material such as natural fiber or synthetic fiber in a predetermined ratio and can be plastically deformed. A belt-like body or a net-like belt-like body in which a shape-retaining material is knitted vertically and horizontally is formed, and the edge of the upper notch portion is constituted by the belt-like body, and the shape-retaining property of the shape-retaining material is utilized. Thus, there has been proposed a shape-retaining shoe (see, for example, Patent Document 1), which has a desired shape for a mouth when attaching and detaching.
JP 2006-204407 A

  However, the shape-holding material has a low shape-holding ability, and the shape cannot be suitably held. In addition, when a load is applied or stepped on during storage, the shoe is deformed into a flat shape, which deteriorates appearance and is difficult to wear. In particular, nursing shoes and hospital shoes are made of cloth and have a large mouth, so that the mouth is easily deformed and is difficult for a person or patient who needs care. Furthermore, there was a drawback that it was very painful when the toes hit against a bed or a wall.

  In view of the above problems, the object of the present invention is to hold the shape of the mouthpiece, the heel part, the upper part and the toe part without deformation, and even if it is deformed, it is easily deformed and retained. The purpose is to provide rugged shoes. Another object is to provide shoes that are less likely to be injured even when the toes hit against a bed or wall, and that are less painful.

  The shoe according to claim 1 is a shoe in which a mouth is formed on the upper part, and after rolling a polyolefin resin sheet having a weight average molecular weight of 100,000 to 500,000 to a rolling ratio of 5 times or more, a total draw ratio Is a shape-retaining sheet made of a stretched polyolefin resin sheet uniaxially stretched 10 to 40 times so that the direction of the peripheral portion and the uniaxial stretching direction of the shape-retaining sheet are substantially parallel to the peripheral portion of the mouthpiece. It is embedded in or laminated on.

  The shoe according to claim 1 is configured so that the shape of the mouth is not deformed by embedding or laminating the periphery of the mouth so that the direction of the edge and the uniaxial stretching direction of the shape-retaining sheet are substantially parallel. Is held on.

  As the polyolefin-based resin constituting the stretched polyolefin-based resin sheet, any olefin-based resin having a film forming ability can be used. For example, a high-density polyethylene resin, a medium-density polyethylene resin, a low-density polyethylene resin, a linear low-density Polyethylene resin, polypropylene resin, ethylene-propylene copolymer, ethylene-butene-1 copolymer, ethylene-pentene-1 copolymer, ethylene-hexene-1 copolymer, ethylene-octene-1 copolymer, ethylene -Vinyl acetate copolymer, ethylene- (meth) acrylic ester copolymer, ethylene-vinyl chloride copolymer, ethylene-propylene-butene copolymer, etc., and high-density polyethylene resin is preferably used .

  When the weight average molecular weight of the polyolefin resin is less than 100,000, the polyolefin resin becomes brittle, the stretchability becomes poor, and a stretched polyolefin resin sheet having sufficient strength or creep resistance can be obtained. Conversely, if it exceeds 500,000, the melt viscosity becomes high, the hot melt molding processability is lowered, and it becomes difficult to obtain a uniform sheet.

  The melt index (hereinafter referred to as MI) of the polyolefin resin is preferably 0.1 to 20 (g / 10 minutes), more preferably 0.2 to 10 (g / 10 minutes), which is excellent in film moldability. is there. MI is an index representing the melt viscosity of a thermoplastic resin specified in JIS K 7210.

Furthermore, in the case of a high density polyethylene resin, 0.94 g / cm ³ or more is preferable because the mechanical strength does not improve even if the density is reduced even if the density is reduced.

  The thickness of the polyolefin resin sheet is not particularly limited, but if it is too thick, a large pressing force and take-up force are required to crush the polyolefin resin sheet with the rolling roll in the rolling process, and the bending of the rolling roll, etc. In some cases, uniform rolling in the width direction may be difficult.Conversely, if it is too thin, the thickness of the polyolefin resin sheet after rolling becomes too thin, and uniform rolling becomes difficult. May shorten the life of the rolling roll, so 0.2 to 15 mm is desirable.

  The polyolefin resin sheet in the present invention is first rolled to a rolling magnification of 5 times or more. Rolling is a method in which a polyolefin-based resin sheet is supplied to a pair of rolls rotating in opposite directions and pressed to reduce the thickness of the sheet and stretch, and the rolled sheet is different from the stretched sheet in that it is an olefin resin. Since it is dense without being oriented, it is highly stretchable.

  When the rolling temperature is lowered, uniform rolling cannot be performed, and when it is raised, the melt is cut. Therefore, the roll temperature during rolling is preferably in the range of “melting point−40 ° C.” to melting point of the olefin resin of the polyolefin resin sheet to be rolled. More preferably, it is “melting point−30 ° C.” to “melting point−5 ° C.” of the olefin 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).

  If the applied pressure (linear pressure) applied to the polyolefin resin sheet by the rolling roll is too small, it may not be possible to obtain a predetermined rolling magnification, and conversely if it is too large, not only will the bending of the rolling roll occur, Sliding easily occurs between the rolling roll and the raw sheet, and uniform rolling may be difficult. Therefore, the applied pressure is preferably 100 MPa to 3000 MPa, and more preferably 300 MPa to 1000 MPa.

  When the rolling ratio is less than 5 times, the effect of suppressing necking at the time of uniaxial stretching performed later cannot be obtained, high-strength uniaxial stretching cannot be performed, or the uniaxial stretching step Therefore, it is 5 times or more, preferably 7 times or more. There is no particular upper limit to the rolling ratio, but the higher the rolling ratio is, the more load is applied to the rolling equipment, so 10 times or less is preferable.

  The rolling magnification is defined as (cross-sectional area of polyolefin resin sheet) / (cross-sectional area of polyolefin resin sheet after rolling), but the width of the polyolefin resin sheet hardly changes before and after rolling. (Thickness of resin sheet) / (thickness of polyolefin resin sheet after rolling).

  The rolled polyolefin resin sheet is then uniaxially stretched at a total stretch ratio of 10 to 40 times.

  As the uniaxial stretching method, any conventionally known method may be employed. Examples thereof include a roll uniaxial stretching method and a zone uniaxial stretching method in which stretching is performed while heating with a heater or hot air.

  Since the uniaxial stretching of the rolled polyolefin resin sheet is highly stretched by 10 to 40 times, a multistage uniaxial stretching method in which the uniaxial stretching is repeated a plurality of times is preferable. When performing multistage uniaxial stretching, the number of stretching is preferably 2 to 20 times, more preferably 3 to 15 times, still more preferably 4 to 10 times.

  When performing multi-stage stretching by a roll uniaxial stretching method, it is desirable to install a feeding pinch roll, a take-up pinch roll, and at least one, preferably a plurality of contact rolls that rotate at a constant speed between these rolls. By installing such a contact roll, uniform stretchability is improved and stable stretch molding can be performed.

  The contact roll performs uniaxial stretching by applying a frictional force to the polyolefin resin sheet without being pinched. Further, the contact roll may be connected to the feeding roll and / or the take-up roll by a connecting member made of a gear, a chain, a pulley, a belt, or a combination thereof.

  The uniaxial stretching temperature cannot be uniformly stretched when it is low, and the sheet melts and cuts when it is high. Therefore, the range of “melting point−60 ° C.” to the melting point of the polyolefin resin of the polyolefin resin sheet to be stretched is more preferable, It is “melting point−50 ° C.” to “melting point−5 ° C.” of the polyolefin resin.

  The uniaxial stretching ratio may be determined so that the entire stretching ratio is within this range in consideration of the rolling ratio since the entire stretching ratio is 10 to 40 times. Since the mechanical strength is not improved, it is preferably 1.3 times or more, more preferably 1.5 times or more, and still more preferably 1.8 times or more. Moreover, although an upper limit is not specifically limited, 4 times or less are preferable, More preferably, it is 3.5 times or less. The overall draw ratio is a numerical value obtained by multiplying the rolling ratio and the uniaxial draw ratio.

  In order to improve the dimensional stability of the stretched polyolefin resin sheet, the stretched polyolefin resin sheet may be annealed at a temperature of the melting point of the polyolefin resin from “melting point−60 ° C.” to the melting temperature or lower.

  If the annealing temperature is lowered, the dimensional stability will not improve, warping will occur if used for a long time, and if it is raised, the polyolefin resin will dissolve and the orientation will disappear and the tensile modulus, tensile strength, etc. will decrease. It is preferable that the resin be annealed at a temperature ranging from “melting point −60 ° C.” to the melting point and below the rolling temperature.

  Annealing is a heat treatment in the production line. When annealing, the stretched polyolefin resin sheet is stretched if a large tension is applied, and it is not stretched or shrinks in a very small state. The length of the stretched polyolefin resin sheet in the stretching direction is preferably kept substantially unchanged, and it is preferable that no pressure is applied to the stretched polyolefin resin sheet. That is, it is preferable that the annealed stretched polyolefin resin sheet is annealed so that the length of the stretched polyolefin resin sheet before annealing is 1.0 or less.

  Accordingly, when the stretched polyolefin resin sheet is continuously annealed while being moved in the heating chamber with a roll such as a pinch roll, the feed rate ratio of the polyolefin resin sheet on the inlet side and the outlet side is 1.0 or less. It is preferable to anneal with setting.

  The heating method at the time of annealing is not particularly limited, and examples thereof include a method of heating with hot air, a heater, a heating plate, hot water or the like. The time for annealing is not particularly limited, and varies depending on the thickness of the stretched polyolefin resin sheet and the annealing temperature, but is generally preferably 10 seconds or more, more preferably 30 seconds to 60 minutes, and still more preferably 1 to 20 Minutes.

  The annealed polyolefin resin sheet may be further aged in a temperature range from 40 ° C. to the melting point of the polyolefin resin. The dimensional stability of the polyolefin resin sheet annealed by aging becomes more excellent.

  Aging is not a continuous treatment in the production line, but it is a relatively long time (minutes, time units) for heat treatment of single-wafers, scrolls, etc., once processed, such as cut winding, of a stretched polyolefin resin sheet. It means to lay down carefully and heat-treat.

  The aging temperature is the same as that left at room temperature when the temperature is low, and when it is high, it is thermally deformed, so the temperature range is from 40 ° C. to the melting point of the polyolefin resin, and the aging time is not effective in a short time and is too long. Even if an effect does not increase, 12 hours-7 days are preferable.

  Since the shape-retaining sheet is composed of the stretched polyolefin resin sheet, the stretched polyolefin resin sheet needs to have shape retainability, and the stretched polyolefin resin sheet is bent at 180 degrees and 90 degrees. It is preferable that the folding return angle θ is 5 degrees or less when 5 minutes have passed after the release after holding for 1 minute, more preferably 20 degrees or less, more preferably 180 degrees folding return angle θ is 20 degrees or less and 90 degrees. The folding return angle θ is less than 20 degrees, more preferably the 180 degree folding return angle θ is 20 degrees or less and the 90 degree folding return angle θ is 15 degrees or less. If one of the 180 ° and 90 ° folding return angles θ, particularly the 180 ° folding return angle θ exceeds 20 °, sufficient shape retention may not be obtained.

  The thickness of the stretched polyolefin resin sheet is not particularly limited, and is generally 5 to 2000 μm, preferably 100 to 1000 μm. In order to improve the mechanical strength of the shape-retaining sheet, it is preferable that a plurality of thin stretched polyolefin resin sheets are laminated. When laminating, it is preferable to laminate 2 to 10 layers of stretched polyolefin resin sheets of 50 to 600 μm, more preferably 2 to 8 layers.

  Further, in order to improve the bending strength of the shape-retaining sheet, it is preferable that the stretched polyolefin resin sheets are laminated so that the uniaxial stretching directions thereof are substantially parallel, and the shape-retaining sheet is wide and easily cracked. In this case, it is preferable that at least one layer of each stretched polyolefin resin sheet is laminated so as to intersect the uniaxial stretching direction of another stretched polyolefin resin sheet.

  As a method of laminating a plurality of stretched polyolefin resin sheets, any conventionally known method may be employed. For example, a method of bonding with a hot melt adhesive such as polyester, polyolefin, or urethane, a reactive adhesive And a method of bonding with an adhesive such as an epoxy adhesive, a urethane adhesive, a polyester adhesive, or a rubber adhesive.

  The shoe according to claim 1 is a shoe in which a cuff is formed in an upper part, and the shape-retaining sheet is formed on a peripheral part of the cuff, in a direction of the peripheral part and a uniaxial stretching direction of the shape-retaining sheet. Are embedded or laminated so as to be substantially parallel to each other.

  The number of shape-retaining sheets embedded or laminated is not particularly limited, and may be small in the case of a wide shape-retaining sheet. is there. For example, 1 to 16 shape-retaining sheets having a width of 1 mm to 4 cm may be embedded or laminated on the peripheral edge of the cuff. When a thin shape-retaining sheet is used, the thin shape-retaining sheet may be embedded or laminated by knitting with other fibers.

  The shoe according to claim 2 is a shoe in which a mouth is formed on the upper part, and after rolling a polyolefin resin sheet having a weight average molecular weight of 100,000 to 500,000 to a rolling ratio of 5 times or more, a total draw ratio The shape-retaining sheet made of a stretched polyolefin resin sheet uniaxially stretched 10 to 40 times so that the vertical direction of the collar portion and the uniaxial stretching direction of the shape-retaining sheet are substantially parallel to the collar portion. It is buried or laminated.

  In the shoe according to claim 2, the shape of the heel portion is not deformed by being embedded or laminated in the heel portion so that the vertical direction of the heel portion and the uniaxial stretching direction of the shape-retaining sheet are substantially parallel. Is held on.

  The number of shape-retaining sheets embedded or laminated is not particularly limited, and may be small in the case of a wide shape-retaining sheet. is there. For example, 1 to 16 shape-retaining sheets having a width of 1 mm to 3 cm may be embedded or laminated in the collar portion. When a thin shape-retaining sheet is used, the thin shape-retaining sheet may be embedded or laminated by knitting with other fibers.

  The shoe according to claim 3 is a shoe having a cuff formed on the upper part, and after rolling a polyolefin resin sheet having a weight average molecular weight of 100,000 to 500,000 to a rolling ratio of 5 times or more, a total draw ratio Is a shape-retaining sheet made of a stretched polyolefin resin sheet that has been uniaxially stretched 10 to 40 times, and the up-down direction of the upper part and the uniaxial stretching direction of the shape-retaining sheet are substantially parallel to the circumferential direction of the upper part. It is embedded or laminated so that it becomes.

  The shoe according to claim 3 is embedded or laminated in the circumferential direction of the upper part so that the vertical direction of the upper part (the circumferential direction of the upper part) and the uniaxial stretching direction of the shape-retaining sheet are substantially parallel. Thus, the shape of the upper part is held so as not to be deformed.

  The shape-retaining sheet may be embedded or laminated so as to go around the upper part from one bottom part to the other bottom part, or may be embedded or laminated so as to go around the upper part and the bottom part. In addition, when a part of the upper part is cut and a fastener such as a fastening belt or a shoelace is installed, it may be embedded or laminated from the side of the fastener to the bottom of the lower part. The shoe may be embedded or laminated so as to go around the shoe from the side portion to the opposite side portion of the fastener through the bottom portion.

  The number of shape-retaining sheets embedded or laminated is not particularly limited, and may be small in the case of a wide shape-retaining sheet. is there. For example, 4 to 16 shape-retaining sheets having a width of 1 mm to 3 cm may be embedded or laminated in the circumferential direction of the upper part. When a thin shape-retaining sheet is used, the thin shape-retaining sheet may be embedded or laminated by knitting with other fibers.

  The shoe according to claim 4 is a shoe in which a mouth is formed on the upper part, and after rolling a polyolefin resin sheet having a weight average molecular weight of 100,000 to 500,000 to a rolling ratio of 5 times or more, a total draw ratio The shape-retaining sheet made of a stretched polyolefin resin sheet uniaxially stretched 10 to 40 times so that the peripheral direction of the toe portion and the uniaxial stretching direction of the shape-retaining sheet are substantially parallel to the toe portion. It is buried or laminated.

  In the shoe according to claim 4, the shape of the toe portion is not deformed by embedding or laminating the toe portion so that the circumferential direction of the toe portion and the uniaxially extending direction of the shape-retaining sheet are substantially parallel. It is reinforced so that it is hard to get injured even if the toes hit against a bed or wall.

  The shape-retaining sheet may be embedded or laminated so as to go around the upper part from one bottom part to the other bottom part of the toe part, but is embedded or laminated so as to make one turn around the upper part and the bottom part. It is preferable.

  The number of shape-retaining sheets embedded or laminated is not particularly limited, and may be small in the case of a wide shape-retaining sheet. is there. For example, 4 to 16 shape-retaining sheets having a width of 1 mm to 3 cm may be embedded or laminated in the peripheral direction of the toe portion. When a thin shape-retaining sheet is used, the thin shape-retaining sheet may be embedded or laminated by knitting with other fibers.

  In addition, the shape-retaining sheet is bent into a substantially U-shape on the ring-shaped object of the shape-retaining sheet formed so as to go around the upper part from one bottom part to the other bottom part of the toe part, and its uniaxial stretching direction However, they may be integrated so as to be substantially orthogonal to the uniaxial stretching direction of the ring-shaped shape-retaining sheet to form a bag-like toe protector, which may be embedded or laminated on the toe portion of the shoe.

  The configuration of the shoe according to claim 1 is as described above, and after rolling a polyolefin resin sheet having a weight average molecular weight of 100,000 to 500,000 to a rolling ratio of 5 times or more, the total stretching ratio is uniaxial to 10 to 40 times. A shape-retaining sheet made of a stretched polyolefin-based resin sheet is embedded or laminated at the periphery of the mouth so that the direction of the periphery and the uniaxial stretching direction of the shape-retaining sheet are substantially parallel. Therefore, the shape of the cuff can be held without being deformed, and even if it is deformed, it can be easily deformed and held in its original shape.

  In the shoe according to claim 2, the shape-retaining sheet is embedded or laminated in the heel part so that the vertical direction of the heel part and the uniaxial stretching direction of the shape-retaining sheet are substantially parallel to each other. The shape can be held so as not to be deformed, and even if it is deformed, it can be easily deformed and held in the original shape.

  In the shoe according to claim 3, the shape-retaining sheet is arranged so that the up-down direction of the upper part (the circumferential direction of the upper part) and the uniaxial stretching direction of the shape-retaining sheet are substantially parallel to the circumferential direction of the upper part. Since it is embedded or laminated, it can be held so that the shape of the upper part is not deformed, and even if it is deformed, it can be easily deformed and held in its original shape.

  In the shoe according to claim 4, the shape-retaining sheet is embedded or laminated on the toe portion so that the peripheral direction of the toe portion and the uniaxial stretching direction of the shape-retaining sheet are substantially parallel. The shape can be held so as not to be deformed, and even if it is deformed, it can be easily deformed and held in the original shape. In addition, it is reinforced so that it is hard to get injured even if the toe hits against the bed or wall.

Next, examples of the present invention will be described with reference to the drawings, but the present invention is not limited to the following examples.
(Example 1)
FIG. 1 is a side view showing an example of a shoe according to claim 1. In the figure, reference numeral 1 denotes an upper part, and a cuff 2 is formed by opening a part of the upper part 1. The shape-retaining sheet 6 is embedded in the periphery of the mouthpiece 2 such that the direction of the periphery of the mouthpiece 2 and the uniaxial stretching direction of the shape-retaining sheet 6 are substantially parallel. In the figure, 3 is a heel part, 4 is a bottom part, and 5 is a toe part.

The manufacturing method of the shape retaining sheet 6 is as follows.
A high-density polyethylene resin (manufactured by Nippon Polychem Co., Ltd.) having a weight average molecular weight (Mw) of 330,000 and a melting point of 135 ° C. is supplied to the same-direction twin-screw kneading extruder (manufactured by Plastic Engineering Laboratory) and melt-kneaded at a resin temperature of 200 ° C. After that, the melt-kneaded product was formed into a sheet having a width of 330 mm and a thickness of 3.1 mm by 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 ratio of 11.5 times using a rolling molding machine (manufactured by Sekisui Koki Co., Ltd.) heated to 125 ° C. to obtain a rolled polyethylene resin sheet having a width of 330 mm and a thickness of 270 μm.

  The obtained rolled polyethylene resin sheet was subjected to 1.8 times multi-stage stretching with a hot-air heating type multi-stage stretching apparatus (manufactured by Kyowa Engineering) heated to 110 ° C., and the total draw ratio was 20.7 times, width 260 mm, thickness A stretched polyethylene resin sheet having a thickness of 190 μm was obtained.

  The obtained stretched polyethylene resin sheet was supplied with a pinch roll to a hot air heating tank with a line length of 19.25 m set at 125 ° C. at an inlet speed of 2.75 m / min, and an outlet speed of 2.75 m / min. Set to, and then subjected to primary annealing for 7 minutes, followed by secondary annealing in the same manner to obtain an annealed stretched polyethylene resin sheet, which is then fed to a constant temperature bath at 60 ° C. and aged for 24 hours, An aged stretched polyethylene resin sheet was obtained. The obtained stretched polyethylene resin sheet was bent at 180 degrees and 90 degrees and held for 1 minute and then released, and the folding return angle θ after 15 minutes from the release was 5 degrees and 8 degrees, respectively.

  Five linear low-density polyethylene resin sheets with a thickness of 30 μm and four obtained stretched polyethylene resin sheets are alternately laminated, and heat-sealed with a 160 ° C. heating roll to maintain a shape retention of about 910 μm. A sheet was obtained. The obtained shape-retaining sheet was cut in the uniaxial stretching direction to obtain a long shape-retaining sheet having a width of 1 cm. The obtained long shape-retaining sheet was laminated between two layers of cloth forming the upper part 1 and heat-sealed with a 160 ° C. press.

(Example 2)
FIG. 2 is a side view showing an example of a shoe according to claim 2. The shape-retaining sheet 7 is laminated on the flange 3 so that the vertical direction of the flange 3 and the uniaxial stretching direction of the shape-retaining sheet 7 are substantially parallel.

  Four linear low-density polyethylene resin sheets having a thickness of 30 μm and the four stretched polyethylene resin sheets obtained in Example 1 were alternately laminated, and heat-sealed with a heating roll at 160 ° C. to a thickness of about 880 μm. A shape-retaining sheet was obtained. The obtained shape-retaining sheet was cut in the uniaxial stretching direction to obtain a long shape-retaining sheet having a width of 3 cm. The obtained long shape-retaining sheet was laminated on the heel part 3 so that the linear low density polyethylene resin sheet was in contact with the heel part 3, and was heat-sealed with a 160 ° C. press.

(Example 3)
FIG. 3 is a side view showing an example of a shoe according to claim 3. The three shape-retaining sheets 8 are embedded in the upper part 1 so that the circumferential direction of the upper part 1 and the uniaxially extending direction of the shape-retaining sheet 7 are substantially parallel. As the shape-retaining sheet 8, the long shape-retaining sheet obtained in Example 1 was used, laminated between two layers of cloth forming the upper part 1, and heat-sealed with a 160 ° C. press.

Example 4
FIG. 4 is a side view showing an example of a shoe according to claim 4. A toe protector 9 is embedded in the toe part 5. As shown in FIG. 5, the toe protector 9 is formed by bending the shape-retaining sheet 92 obtained in Example 1 into a substantially U-shape on the ring-shaped member 91 of the shape-retaining sheet obtained in Example 1. And integrated into a bag shape. The uniaxial stretching direction of the ring-shaped object 91 is the A direction, the uniaxial stretching direction of the shape-retaining sheet 92 is the B direction, and the uniaxial stretching directions of both are substantially orthogonal. The toe protector 9 was laminated between the two layers of the toe portion 5 and heat-sealed with a 160 ° C. press.

It is a side view which shows an example of the shoes of Claim 1. It is a side view which shows an example of the shoes of Claim 2. It is a side view which shows an example of the shoes of Claim 3. It is a side view which shows an example of the shoes of Claim 4. It is a side view which shows an example of a toe protector.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Upper part 2 Footwear 3 Hip part 4 Bottom part 5 Toe part 6, 7, 8 Shape retainer sheet 9 Toe protector

Claims (9)

  A shoe with a cuff formed on the upper part, and after rolling a polyolefin resin sheet having a weight average molecular weight of 100,000 to 500,000 to a rolling ratio of 5 times or more, the total stretching ratio is uniaxially stretched to 10 to 40 times. The shape-retaining sheet made of a stretched polyolefin resin sheet is embedded or laminated at the periphery of the shoe so that the direction of the periphery and the uniaxial stretching direction of the shape-retaining sheet are substantially parallel. Shoes characterized by.   A shoe with a cuff formed on the upper part, and after rolling a polyolefin resin sheet having a weight average molecular weight of 100,000 to 500,000 to a rolling ratio of 5 times or more, the total stretching ratio is uniaxially stretched to 10 to 40 times. The shape-retaining sheet made of the stretched polyolefin-based resin sheet is embedded or laminated in the collar part so that the vertical direction of the collar part and the uniaxial stretching direction of the shape-retaining sheet are substantially parallel to each other. Features shoes.   A shoe with a cuff formed on the upper part, and after rolling a polyolefin resin sheet having a weight average molecular weight of 100,000 to 500,000 to a rolling ratio of 5 times or more, the total stretching ratio is uniaxially stretched to 10 to 40 times. The shape-retaining sheet made of the stretched polyolefin resin sheet is embedded or laminated so that the up-down direction of the upper part and the uniaxial stretching direction of the shape-retaining sheet are substantially parallel to the circumferential direction of the upper part. Shoes characterized by being.   A shoe with a cuff formed on the upper part, and after rolling a polyolefin resin sheet having a weight average molecular weight of 100,000 to 500,000 to a rolling ratio of 5 times or more, the total stretching ratio is uniaxially stretched to 10 to 40 times. The shape-retaining sheet made of a stretched polyolefin resin sheet is embedded or laminated in the toe portion so that the peripheral direction of the toe portion and the uniaxial stretching direction of the shape-retaining sheet are substantially parallel. Features shoes.   The stretched polyolefin resin sheet is bent at 180 degrees and 90 degrees and held for 1 minute and then released, and the folding return angle θ when 5 minutes have elapsed after the release is both 20 degrees or less. The shoe according to any one of 1 to 4.   The shoe according to any one of claims 1 to 4, wherein the shape-retaining sheet is formed by laminating a plurality of stretched polyolefin resin sheets.   The shoe according to claim 6, wherein the stretched polyolefin resin sheets are laminated so that the uniaxial stretching directions thereof are substantially parallel.   The shoe according to any one of claims 1 to 7, wherein the polyolefin-based resin is a high-density polyethylene resin.   The shoe according to claim 1, wherein a plurality of shape-retaining sheets are embedded or laminated.

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