TW201330792A - Method of manufacturing shock absorbing sheet with superior design sense and shock absorbing sheet - Google Patents

Abstract

An objective of the present invention is to address the problem of providing a shock absorbing sheet with a simple method which does not collapse. A method of manufacturing a shock absorbing sheet in which a first elastic member formed from an elastomer, a design sheet, and a second elastic member formed from an elastomer and with lower rigidity than the first elastic member are stacked in this order comprises a first forming step of forming the first elastic member, and a second forming step of forming the second elastic member after forming the first elastic member, thereby solving the problem.

Description

Manufacturing method of impact absorbing sheet excellent in design and impact absorbing sheet

The present invention relates to an impact absorbing sheet, for example, to an impact absorbing sheet which is provided on a shoe to absorb impact. It is also a kind of label, which can be applied to a vehicle, a built-in sticker, etc., in addition to an excellent design, or as a sticker for adhesives, especially for a pair of slippers, sandals, and a shallow mouth. There are a method for producing a sheet excellent in designability with a female shoe and an impact absorbing sheet excellent in design.

An elastic material such as an elastic body can be formed into a predetermined shape, and this can be disposed on the sole as a cushioning member for relaxing the impact on the foot during walking or the like.

Further, in order to improve the decorative popularity of such a cushioning member, it is proposed to provide a cushioning member for a shoe provided with a decorative sheet on the surface between the upper cushion sheet and the lower cushion sheet formed of the elastic member. (Patent Document 1).

In the cushioning member proposed in the above Patent Document 1, it is disclosed that each of the upper cushion sheet and the lower cushion sheet is formed, and the decorative sheet is joined by an adhesive or a heat fusion bonding.

On the other hand, Patent Document 2 discloses an insole provided with a surface material on the surface of a transparent elastic body, and discloses that the hardness of the elastic body is set to a specific value, and can be maintained even in a low temperature region of 0 ° C or lower. High impact absorption rate.

[Previous Technical Literature] [Patent Document]

[Patent Document 1] Japanese Utility New Case Registration No. 3151343

[Patent Document 2] Japanese Patent Laid-Open Publication No. 2007-195944

Patent Document 1 discloses a buffer member having a three-layer structure in which a decorative sheet is provided between an upper buffer sheet and a lower buffer sheet. However, when such a buffer member having a three-layer structure is formed, as disclosed in Patent Document 1, when manufacturing using an adhesive, in addition to the process of forming a plurality of buffer sheets, it is necessary to apply an adhesive to each buffer. The extra work of the sheet is not economical.

On the other hand, the inventors of the present invention have found that the heat-melting bonding method is used to soften the formed buffer sheets by heat during heat fusion, and there is a problem that the formation cannot be maintained. . Therefore, it is understood that a buffer sheet cushioning member which is marketable cannot be obtained. The present invention has been made in an effort to maintain such formability.

The present inventors have repeated studies that have to solve the above problems, and have focused on their manufacturing processes. Further, when a metal mold is used as an elastic body of a material, first, a first elastic member having a high hardness is formed, and then a second elastic member having a low hardness is formed, and it is found that the above problem can be solved, and the present invention is carry out.

That is, the present invention is an impact of laminating a first elastic member formed of an elastic body, a design sheet, and a second elastic member having a lower hardness than the first elastic member formed of the elastic body in this order. A method of producing an absorbent sheet, comprising: a first forming process of forming the first elastic member; and a second forming process of forming the second elastic member after the forming the first elastic member.

Further, in the first forming process, it is preferable to form the first elastic member so as to form the sheet of the first elastic member and to form the first elastic member so as to be filled with the elastic body. Further, in the second forming process, it is preferable to arrange the design sheet on the first elastic member obtained in the first molding process, and to form the second elastic member by pouring the elastic sheet into the design sheet.

Further, it is preferable to further include a toughening processing project, and it is preferable that the above-mentioned design sheet is coated with a binder on both sides thereof.

Further, it is preferable that the difference in hardness between the first elastic member and the second elastic member is larger than 5°. Further, the impact absorbing sheet is an insole sheet of the shoe, the first elastic member is an elastic member on the foot side, and the second elastic member is preferably an elastic member on the shoe side.

Further, another aspect of the present invention is an impact absorbing sheet obtained by the above-described manufacturing method, and further, a first elastic member formed of an elastic body, a design sheet, and a first elastic ratio formed by an elastic body The impact absorbing sheet in which the lower second elastic members are laminated in this order is characterized in that the difference in hardness between the first elastic member and the second elastic member is larger than 5°.

According to the production method of the present invention, it is possible to provide a design excellent impact absorbing sheet having a three-layer structure sandwiching a design sheet which can be maintained by a simple method and which can be circulated in the market, and a method for producing the same.

[Formation for carrying out the invention]

Hereinafter, the present invention will be described in detail.

The present invention is a method for producing a design excellent impact absorbing sheet in which a first elastic member, a design sheet, and a second elastic member having a lower hardness than the first elastic member are laminated in this order.

The elastic member is formed of an elastomer, and the elastomer is not particularly limited as long as it is a thermoplastic elastomer, and examples thereof include a vinyl chloride elastomer, a styrene elastomer, an olefin elastomer, and an urethane elastomer. Body, polyester elastomer, polyamide elastomer, nylon elastomer, and the like.

Among these elastomers, a styrene-based elastomer is particularly preferable, and examples of the styrene-based elastomer include styrene-butadiene-based thermoplastic elastomer (SBS) and styrene-ethylene-butene-based thermoplasticity. Elastomer (SEBS), etc.

Further, in the thermoplastic elastomer, the melting point is preferably 150 ° C or higher, and more preferably 170 ° C or higher. In the case of the following melting points, it is easy to be deformed by heat, and there is a case where a defect occurs in the production of a product. Further, it is preferably 220 ° C or less, more preferably 210 ° C or less. In this melting point At the time of forming the metal mold, it is necessary to apply higher heat without being economical. This is a cause of thermal deterioration of the thermoplastic elastomer.

The elastic member is preferably made of a transparent or translucent elastomer in order to make it visible in the surface of the design sheet to be described later. Coloring can be performed as long as it has transparency. In order to make the appearance of the design sheet look good, it is ideal for transparency.

The design of the sheet is improved in the shape of the sheet produced by the production method of the present invention by the design of the surface thereof, and the member to which this is mounted can be imparted with an excellent shape. The material of the design sheet is not particularly limited as long as the design of the applied pattern and color can be formed on the surface thereof, and it is preferable to reduce the impact absorbability of the material impact-absorbing sheet having flexibility. Specific examples include woven fabrics and non-woven fabrics formed of natural fibers such as cotton, hemp, and wool; woven fabrics and non-woven fabrics formed of chemical fibers such as nylon; plastic films; paper; metal foil; synthetic paper. Further, in order to improve the design, a lamel process can also be applied. It is also preferable that the thickness of the sheet is 50 μm to 250 μm.

Further, the design on the design sheet is not particularly limited as long as it has a shape, and may be a pattern, a color, a character, a combination of the above, a flower pattern, a water droplet pattern, or the like.

The manufacturing method of the present invention is to form a laminate formed of a first elastic member, a design sheet, and a second elastic member, and has a first forming process of a first elastic member having a high forming hardness; and forming the first elastic member Thereafter, the construction of the second elastic member having a low hardness is formed.

<First Forming Engineering>

The first forming process is a process of forming a first elastic member having high hardness among two elastic members. The first forming process is not particularly limited as long as the first elastic member is formed, and it can usually be formed by a method of pouring an elastic body into a metal mold or the like. Moreover, although the impact absorbing sheet of the present invention includes a design sheet, the design sheet may be placed in the metal mold and formed together with the first elastic member in the first molding process, or may be formed in the second forming process and the second to be described later. The elastic members are formed together.

In the first forming process, when the first elastic member is formed together with the design sheet, the sheet is formed by forming a mold of the first elastic member, and the elastic member is poured thereon to form the first elastic member. First, a first elastic member is molded, a metal mold of the first elastic member is prepared, and an elastic body as a material is poured into the metal mold to perform molding. The temperature at the time of molding is not particularly limited as long as the elastomer becomes the temperature of the fluid. The elastomer that was poured into the mold was not cooled from the mold and cooled directly to room temperature. The speed of cooling is also not particularly limited.

In forming the metal mold of the first elastic member, the design sheet may be preliminarily disposed, and the elastic body may be poured thereon. The first elastic member is thus formed together with the design sheet.

As a preferred embodiment of the present invention, it is an insole sheet of a shoe. At this time, the first elastic member having a high hardness is in contact with the bare foot of the person, and the second elastic member having a low hardness is in contact with the shoe. In addition, when it is used for a device for a vehicle, a sheet for preventing fall, and the like, various members and articles are disposed on the first elastic member side having a high hardness. Therefore, the hardness of the first elastic member is 10° to 30° left Right is ideal. It is not easy to stick to the foot, various members and articles in such a range, and it is also possible to ensure impact and vibration absorption. The hardness is ideal from 10 ° to 25 °, and more preferably from 10 ° to 20 °. Further, the hardness referred to herein is a value measured by a durometer according to JIS K 6253.

Further, the layer thickness of the first elastic member is usually 1.5 mm or more and 3.5 mm or less, and preferably 1.5 mm or more and 2.5 mm or less.

Further, even for the elastomer which is the material of the first elastic member of the present invention, the hardness is preferably from 10 to 30, more preferably from 10 to 25, and even more preferably from 10 to 20.

The design sheet contained in the impact-absorbing sheet of the present invention is preferably the same size as the front side elastic member, or smaller. When it is large, it will produce cuts that must be reshaped after forming.

It is desirable to design the sheet to apply a binder to both sides. When the material of the design sheet is paper, synthetic paper or the like, there is a case where delamination occurs between the sheet and the elastic member. This type of interlayer peeling can be prevented by applying adhesive processing to both sides of the design sheet. The binder processing is carried out by applying a binder resin (organic system) to the surface of the design sheet. The method of coating is not particularly limited, and it may be a method of printing by a coating method, a spray, or an impregnation method generally used.

<Second forming project>

The first elastic member obtained in the first forming process is then sandwiched between the first elastic member and the second elastic member through a second forming process of forming the second elastic member. In the first forming project and design When the sheet is formed together with the first elastic member, the second elastic member is formed on the design sheet. On the other hand, when the first forming process only shapes the first elastic member, in the second forming process, the design sheet is disposed on the first elastic member, and the second elastic member is formed on the design sheet. Specifically, a new metal mold is present in the mold in which the first elastic member is present, and an elastic body which is a material of the second elastic member is poured into the mold to form the design excellent impact absorption sheet of the present invention. The temperature at the time of molding is not particularly limited as long as the elastomer becomes a fluid temperature. The impact-absorbing sheet of the present invention after molding is taken out from the metal mold.

Further, it is also preferable to form the first elastic member and form a bowl-shaped edge at the edge portion thereof, and to form the second elastic member so as to fill the recess formed by the edge of the bowl shape. In such a manner, the formation of the two elastic members is not present in the side surface portion of the impact absorbing sheet, so the completion is very good. Further, in the edge portion, since the two elastic members are not laminated, the edge portion can be completed thinly, and it is preferable as the insole sheet of the shoe.

In the second forming process described above, the formed first elastic member is softened by the heat of the elastomer molding, and the problem that the molding cannot be maintained occurs. The inventors of the present invention have repeatedly reviewed and found that the hardness of the second elastic member is made lower than the hardness of the formed first elastic member, even if the elasticity of the second elastic member is to be formed. When the body is poured into the mold, the first elastic member maintains sufficient formability, and a laminate which can be circulated as a commodity in the market can be obtained.

Making the hardness of the first elastic member more than the hardness of the second elastic member When it is high, the elastomer of the first and second elastic members satisfying such conditions may be appropriately selected. Further, when used as an insole sheet of a shoe or the like, since the sole must be adhered to a member which is another adhesive base, the second elastic member having a low hardness is the shoe side, and it is preferable to be the base side. Specifically, the hardness of the second elastic member is preferably 10° or less, and more preferably 5° or less.

Further, when used as an insole sheet of a shoe, the layer thickness of the second elastic member is usually 0.5 mm or more and 2.0 mm or less, and preferably 0.7 mm or more and 1.5 mm or less.

Further, even in the elastomer which is the material of the second elastic member of the present invention, the hardness is preferably 10 or less, more preferably 5 or less.

Further, it is preferable that the difference in hardness between the two elastic members is larger than 5°. In this way, since there is a difference in hardness, the molding of the molded body can be easily maintained.

Further, even if the elastic body of the material of the two elastic members is formed, the difference in hardness is more than 5°. Since the hardness is inferior in this manner, it is easy to maintain the molded body.

On the other hand, in order to maintain the heat of the formed first elastic member with respect to the elastic body poured therein, the melting point of the elastic body of the material of the first elastic member is more than that of the elastic material of the material of the second elastic member. A higher point is ideal. Even if an elastomer of such a property is used, it is easy to maintain the molding.

<Toughening Process Engineering>

The impact-absorbing sheet of the present invention which has been formed by the above-described manufacturing process may be warped due to the temperature drop of the elastomer after molding. And this It may be caused by the difference in hardness of the two elastic members. Therefore, in order to correct the warpage generated, it is desirable to undergo a toughening process after the sheet is formed. The toughening process is a process in which the molded body is heated at a constant temperature to remove warpage caused by the forming. The toughening process of the present invention is usually carried out at 65 to 85 ° C for 30 to 70 minutes, and preferably at 70 to 80 ° C for 50 to 60 minutes.

The apparatus used in the toughening processing is not particularly limited, and a known one can be used, and specifically, a dryer, an oven, or the like can be used.

The design excellent impact absorbing sheet of the present invention is disposed in contact with the surface of the member on which the elastic member is disposed when disposed in the member. For example, when used as an insole of a shoe, the shoe is disposed in contact with the second elastic member, and the design of the design sheet is integrated with the shoe, and the shoe can be excellent in shape, and the impact absorbing sheet can protect the foot. In addition, it can be used as a base or a device for vibration and shock absorption that has a multi-pronged design. In addition, the window glass, the wall, the door, etc., which are attached to the car or the building, can have the same function as the label and the sticker.

[Examples]

Hereinafter, the present invention will be specifically described based on examples, but the present invention is not limited by the following examples.

A sheet of the insole that becomes a shoe is formed by the following method.

<Example 1>

First, a styrene-based thermoplastic elastomer (hardness: 15°) is prepared as the first elastic member elastic body (primary elastic body) which is the foot side, and a styrene-based thermoplastic elastomer (hardness: 5°) is prepared as the shoe side. The second elastic member is an elastic body (secondary elastic body). The primary elastic member in which the fluid heated to 210 ° C was poured into the first elastic member metal mold (primary metal mold) was cooled to 40 ° C in the mold over 60 seconds to form the first elastic member.

After the design sheet in which the metal foil is placed by the binder resin (organic) is disposed on the formed first elastic member, the second elastic member is mounted on the primary metal by a metal mold (secondary metal mold). On the mold, a secondary elastomer of a fluid heated to 210 ° C was poured, and the temperature was lowered to room temperature in 5 minutes to 10 minutes to form a design excellent sheet of the present invention. When the primary metal mold and the secondary metal mold are removed from the molded body, the warpage may be maintained although some warpage may occur.

<Example 2>

First, a styrene-based thermoplastic elastomer (hardness: 15°) is prepared as the first elastic member elastic body (primary elastic body) which is the foot side, and a styrene-based thermoplastic elastomer (hardness: 5°) is prepared as the shoe side. The second elastic member is an elastic body (secondary elastic body). After the sheet-side design sheet in which the binder resin (organic system) is subjected to the adhesive treatment is disposed on the cavity side (male metal mold) of the first elastic member metal mold (primary metal mold), the first elastic member is placed in the first elastic member. A primary body of a fluid heated to 210 ° C was poured into a metal mold (primary metal mold) and spent 60 seconds in a metal mold. At a temperature of 40 ° C, a first elastic member having a design sheet is formed.

After moving the first elastic member having the above-mentioned design sheet to the second elastic member metal mold (secondary metal mold), the second elastic body of the fluid heated to 210 ° C is poured, and the temperature is lowered to the chamber in 5 to 10 minutes. The design is excellent in the form of the sheet of the present invention. When the primary mold and the secondary metal mold are removed from the molded body, a slight warpage is generated, but the molding can be maintained.

In order to remove the warpage of the molded body obtained in Example 1 and Example 2, the molded body was placed in a dryer and subjected to toughening at 80 ° C for 1 hour to obtain a design excellent sheet of the present invention. The obtained molded bodies are all warped, and the molding can be maintained, and the insole as a shock absorbing shoe can be sufficiently circulated in the market.

<Comparative Example 1>

A styrene-based thermoplastic elastomer (hardness: 5°) was used as the second elastic member elastomer (the styrene-based thermoplastic elastomer (hardness: 5°) was used as the first elastic member elastic body (primary elastic body) ( Sheet forming can be carried out in the same manner as in Example 1 except for the secondary elastomer. When the primary metal mold and the secondary metal mold are removed from the molded body, the molding of the metal mold cannot be maintained.

[Industrial Availability]

The design-improving impact-absorbing sheet produced by the production method of the present invention has excellent impact absorbability in a shoe insole or the like as a sheet having moderate viscous and elastic properties, and is excellent in shape, especially as It is suitable for women's slippers, sandals, and shock absorbing sheets with no shallow mouth and women's shoes. Moreover, the apparatus for the automatic vehicle and the interior material can be usefully used as various members, mats for articles, or vibration and impact absorbing members. Furthermore, it can be used in the same manner as stickers, labels, etc., by sticking to window glass, walls, doors, and the like.

1‧‧‧ Shock Absorption Sheet

2‧‧‧First elastic member

3‧‧‧Second elastic member

4‧‧‧Design sheet

Fig. 1 is a conceptual view showing a cross section of a three-layer structure of a shock absorbing sheet produced by the production method of the present invention.

Fig. 2 is a conceptual view of a shock absorbing sheet manufactured by the manufacturing method of the present invention as seen from above.

1‧‧‧ Shock Absorption Sheet

2‧‧‧First elastic member

3‧‧‧Second elastic member

4‧‧‧Design sheet

Claims (9)

A method for producing a shock absorbing sheet, wherein a first elastic member formed of an elastic body, a design sheet, and a second elastic member having a lower hardness than a first elastic member formed of an elastic body are laminated in this order A method of manufacturing a shock absorbing sheet, comprising: a first forming process of forming the first elastic member; and a second forming process of forming the second elastic member after forming the first elastic member. The method for producing a shock absorbing sheet according to the first aspect of the invention, wherein the first forming process is to form a sheet in a mold for forming a first elastic member, and form the sheet by injecting an elastic body thereon. An elastic member. The method for producing a shock absorbing sheet according to the first aspect of the invention, wherein the second forming process is to arrange a design sheet on the first elastic member obtained in the first forming process, and to apply elasticity to the design sheet. The second elastic member is formed in a body manner. The method for producing a shock absorbing sheet according to any one of the first to third aspects of the present invention, further comprising a toughening processing. The method for producing a shock absorbing sheet according to any one of the preceding claims, wherein the design sheet is coated with a binder on both surfaces thereof. The method for producing a shock absorbing sheet according to any one of the first aspect, wherein the difference between the hardness of the first elastic member and the second elastic member is greater than 5°. The method for producing a shock absorbing sheet according to any one of the preceding claims, wherein the first insole member is a foot side elastic member, and the second elastic member It is an elastic member on the side of the shoe. An impact absorbing sheet obtained by the production method according to any one of the first to seventh aspects of the invention. An impact absorbing sheet is a shock absorbing sheet in which a first elastic member formed of an elastic body, a design sheet, and a second elastic member having a hardness lower than that of the first elastic member formed of an elastic body are laminated in this order. The difference between the hardness of the first elastic member and the second elastic member is greater than 5°.