JPH11300864A - Laminate and watchband each of which has foamed layer and production of them - Google Patents

Abstract

PROBLEM TO BE SOLVED: To develop a laminate and watchband each of which has a novel foamed layer (foamed silicone) forming the contact surface with the skin, capable of suppressing the stickiness, stuffiness, slip or the like caused by sweating, good in mounting feeling and excellent in durability, and a method for producing them. SOLUTION: A laminate 1 is obtained by integrally molding foamed layers 3 and a solid layer 2 and a part of the solid layer 2 penetrates into the foamed hole 3a of the contact surface with the solid layer 2 in each of the foamed layers 3 to be cured in an entangled state and a good mounting feeling can be imparted by the foamed layers 3, and the adhesion of the solid layer with the foamed layers 3 becomes strong.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a silicone rubber applied to, for example, a wristwatch band or a strap of various portable devices, and particularly to an allergic reaction even when the skin comes into direct contact with the skin. The present invention relates to a laminate having a foamed layer, a watch band, and a method for producing the same, which does not cause discomfort.

[0002]

BACKGROUND OF THE INVENTION Conventionally, as a material for a watch band, leather or metal is used for a formal one, while a synthetic resin or the like is used for a casual or sporty one. Among them, those using synthetic resin or the like cause sweating when directly touching the skin for a long period of time, thereby causing discomfort such as stickiness and unevenness and slipping. In order to reduce these, a contrivance has been made to reduce the contact area with the skin by providing irregularities or notches on the contact surface with the skin, but the effect has not been sufficient.

[0003] As a material, silicone rubber is preferred because of its excellent strength among synthetic resins and its effect on the human body such as allergy is extremely small. Since pleasure and slippage are inevitable, it is necessary to take some measures to improve the feeling of wearing.

Therefore, the applicant of the present invention focused on the good touch of foamed silicone, and made a portion of the watch band which bears the outer shape and mechanical strength a solid layer formed of silicone rubber, and formed the solid layer with foamed silicone. By laminating the formed foam layer to make a portion directly in contact with the skin, a watch band having excellent mechanical strength and good wearing feeling was obtained. However, in the case of a watch band, since the watch band is attached to a relatively fast-moving wrist, the watch band receives a large dynamic impact, and therefore, the bonding strength between the solid layer and the foam layer is increased so that it can withstand actual use. There was a need to take remedial action.

Incidentally, the present applicant has made an invention relating to a pad for shaping using a laminate of a solid layer of silicone rubber and a foamed layer of foamed silicone rubber, and a method for producing the same.
JP-A-7-328050 and JP-A-8-322
No. 863 to a patent application. However, these relate to a laminate in which a foam material is injected into a cured solid layer and cured, and a laminate in which a cured foam layer is bonded to the cured solid layer, and in each case, the laminate is covered with a cloth. Since it is used for a pad for shaping, the adhesive strength between the solid layer and the foam layer is not required to the extent required for a watch band, and no consideration is given to that point.

[0006]

[Technical Problem Attempted to Be Developed] The present invention has been made in view of such a background, and the sticking, sweating, slippage, etc. due to perspiration are suppressed by forming a foamed layer (foamed silicone) on the contact surface with the skin. A technical object is to develop a laminate having a novel foamed layer, which has a good wearing feeling and a good durability, and a watch band using the same, and a method for manufacturing these.

[0007]

That is, a laminate having a foamed layer according to claim 1 is a laminate obtained by integrally molding a foamed layer and a solid layer. It is characterized in that a part of the solid layer penetrates into the foamed pores on the surface and is hardened in a entangled state. According to the present invention, a good feeling of wearing can be imparted to the foamed layer, and the adhesion between the solid layer and the foamed layer is made strong.

A laminate having a foamed layer according to claim 2 is characterized in that, in addition to the above requirements, the foamed layer and the solid layer are formed of silicone rubber. According to the present invention, when the laminated body is applied to one that is worn on a human body, a good wearing feeling is obtained, and
Does not cause allergic reactions or discomfort.

A watch band according to a third aspect of the present invention is a band-shaped laminate formed by integrally forming a foam layer and a solid layer,
It is characterized in that a part of the solid layer penetrates into the foamed hole in the contact surface of the foam layer with the solid layer and is hardened in a entangled state. According to the present invention, a good feeling of wearing can be imparted to the foamed layer, and the solid layer and the foamed layer are firmly bonded to each other, so that durability can be imparted.

A watch band according to a fourth aspect is characterized in that, in addition to the requirements of the third aspect, the foam layer and the solid layer are formed of silicone rubber.
ADVANTAGE OF THE INVENTION According to this invention, when worn on a human body, a feeling of wearing is good and allergic reaction and discomfort are not given.

[0011] Further, in the watch band according to the fifth aspect, in addition to the requirements of the third or fourth aspect, the foam layer is provided on a side that comes into contact with the skin, and the foam layer is formed on the solid layer in a protruding manner. It is characterized by being formed. ADVANTAGE OF THE INVENTION According to this invention, while a soft wearing feeling is obtained, a human body (arm)
Because the air permeability improves by reducing the contact area with
Sweating can be suppressed, and discomfort such as stickiness and unevenness and slippage can be avoided.

According to a sixth aspect of the present invention, there is provided a method of manufacturing a laminate having a foamed layer and a watch band, wherein a foamed material is injected into a mold, and the foamed material is cured after completion of foaming to have a large number of foamed holes. After the foam layer is formed, by filling the solid material with the solid material, the solid material before curing is penetrated into the foam holes in the foam layer, and the foam layer and the solid layer formed by the solid material are entangled. It is characterized in that it is integrally molded. According to the present invention, since the foam layer and the solid layer are combined in a complicated manner, they can be firmly joined.

[0013] According to a seventh aspect of the present invention, in addition to the requirements of the sixth aspect, the foamed material is a foamed silicone and the solid material is a silicone rubber. It is characterized by having.
According to the present invention, no allergic reaction is caused when worn on a human body. The problem is solved by using the configuration of the invention described in each of the claims.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the "laminate having a foamed layer, a watch band, and a method for producing the same" of the present invention will be specifically described with reference to the drawings. In the following description, first, the “laminate having a foam layer” will be described, and then the “method of manufacturing a laminate having a foam layer” will be described. explain.

The laminate 1 of the present invention is suitable for application to a device that is worn by directly touching the skin. For example, a strap for a wristwatch, a strap for various portable devices such as a camera and a VTR, and a product for sports. For example, a protector such as a shin pad, an elbow pad, a knee pad or the like, or a helmet or the like may be used.

The laminate 1 used for such an application is basically formed by integrally forming a foam layer 3 on one surface of a solid layer 2 as shown in FIGS. Foamed layer 3 formed by foamed silicone 8 as a foaming material
The silicone rubber 7 which forms the solid layer 2 penetrates into the foamed hole 3a on the contact surface with the solid layer 2 in the above, and is hardened in a entangled state to form the bonding layer 4.

Hereinafter, the silicone rubber 7 as a solid material and the foamed silicone 8 as a foaming material which are the raw materials of the laminate 1 will be described. As the silicone rubber 7, KE1950-70 manufactured by Shin-Etsu Silicone Co., Ltd. is used as an example.
This is heat-pressed at 120 ° C. for 3 minutes, and then cured by heating at 150 ° C. for 1 hour after release.

Of course, the material for forming the solid layer 3 may be, in addition to the silicone rubber 7, a millable silicone rubber or other known foam.
Select one that excels in pressing properties (deforms well and provides good pushing action), strength (can withstand repeated use), mold release properties (smooth deprinting is performed), and contact properties (good touch). To use.

The foamed silicone 8 is foamed and cured by mixing a base material 8A and a cross-linking agent 8B. As an example of the base material 8A, NPCO-700 manufactured by Toshiba Silicone Co., Ltd. is used. NPCO-700 (transparent) or THS3500 made by the company as a cross-linking agent 8B
(Green). And these base 8A and crosslinking agent 8B
For example, when mixed at a ratio of 10: 1, the mixture expands with foaming to about three times the volume, cures at room temperature after about 15 minutes, and crosslinks completely after about one week.

As the foamed silicone 8 obtained by making the silicone gel porous, a known foam such as a hydrogen foaming type may be used, and the pressurizing property (good deformation, good press-in action) can be obtained. ), Excellent in strength (can withstand repeated use), air permeability (does not create a defect due to residual air on the surface of microprojections), mold release properties (smooth deprinting is performed), and excellent contact properties (good touch) Select one to use.

Next, the form of the foam layer 3 will be described. That is, in the present invention, the silicone rubber 7 that forms the solid layer 2 penetrates into the foam holes 3a of the foam layer 3 at the contact surface with the solid layer 2 and hardens in a entangled state to form the bonding layer 4. However, in the present embodiment, the foamed layer 3 is formed into a projection shape by dividing or interspersed.

Next, the laminate 1 of the present invention thus constituted
The "method for producing a laminate having a foamed layer" of the present invention, which is used for molding a laminate, will be described.

Preparation of Foamed Silicone First, as shown in FIG. 3, a base material 8A and a cross-linking agent 8B, which are raw materials of foamed silicone material 8 as a foaming material, are taken as an example.
Mix and stir in 1 ratio.

Injection of Foamed Silicone into Concave Section Then, as shown in FIG. 4 (a), a mold 10 having a concave section 10a of a predetermined shape corresponding to the foamed layer 3 formed in a pattern is placed on a base B. The material constituting the mold 10 may be a relatively soft material such as silicone rubber, a harder acrylic resin, a synthetic resin such as a fluororesin having excellent releasability, or a lightweight and heat conductive material. A metal such as aluminum having excellent properties may be used. If the release property is poor, a separate release agent is spray-coated, and in the case of a metal or the like, a fluororesin is coated. Further, a fluororesin dispersion plating in which a fluororesin is dispersed in a film may be applied to the resin or metal such as the hard acrylic. In consideration of the problem of deformation of the mold 10 during pressurization and heating (heat press), which will be described later, it is desirable to form the mold 10 from a relatively hard material.

After the foamed silicone 8 is injected into the concave portion 10a of the mold 10 by an appropriate supply device, unnecessary foamed silicone 8 attached to the upper surface of the mold 10 is removed by a squeegee treatment. At this time, if it is not necessary to particularly consider mass production, the base 8A and the cross-linking agent 8B may be stirred in a container, and the mixture may be filled in the recess 10a using a spatula or the like. It is possible. In this regard, the same can be said for the injection of the silicone rubber 7 described later.

Next, as shown in FIG. 4B, the foamed silicone 8 protruding from the recess 10a is removed by using a squeegee tool 11, and the foamed silicone 8 in the recess 10a is reduced to a predetermined amount. That is, of the foamed silicone 8 located in each of the recesses 10a, a part of the foamed silicone 8 located immediately below the rugged surface of the recessed portion 10a is replaced with the surface tension, contact angle, wetting, etc. Therefore, the squeegee tool 11 is removed together with the tip of the squeegee tool 11 by dragging.

Here, the predetermined amount is defined as the foamed silicone 8
Is an amount required to obtain a desired shape when foamed and cured. Therefore, in order to reduce waste of the foamed silicone 8, it is preferable that the removal amount by the squeegee tool 11 is reduced as much as possible. In the present embodiment, the squeegee processing is performed using a doctor knife-shaped sharp edge squeegee blade as the squeegee tool 11.

As shown in FIG. 7, a foamed silicone 8 extruded from the injection needle 14 using the injection needle 14 is used.
May be injected into the recess 10a. According to such a method, a predetermined amount of the foamed silicone 8 can be injected into each of the concave portions 10a. In addition, the foamed silicone 8 into the recess 10a using such an injection needle 14
In the case of injection, as an example, the injection needle 14 provided in a single supply mechanism is moved by using a dispenser, and the injection needle 14 is sequentially made to face the adjacent concave portion 10a to perform continuous injection or injection. A large number of needles 14 and supply mechanisms may be provided according to the positions of the recesses 10a, and injection may be performed simultaneously on a plurality of recesses 10a.

Thereafter, the foamed silicone 8 expands to about three times its volume with foaming, and after about 15 minutes at room temperature, is cured in a porous state having countless bubbles to form the foamed layer 3. Form. At this time, as shown in FIG. 5A, the foamed silicone 8 whose volume has increased is in a state of protruding from the concave portion 10a of the mold 10.

Installation of Formwork for Main Body (Solid Layer) and Filling of Silicone Rubber Next, as shown in FIG. The mold 12 is placed and filled with the uncured silicone rubber 7 by an appropriate supply device. Next, as shown in FIG. 6A, unnecessary silicone rubber 7 adhered to the upper surface of the mold 12 is removed by a squeegee process. In such a process, as shown in an enlarged manner in FIG. 5B, the silicone rubber 7 forming the solid layer 2 penetrates into the foam holes 3a of the foam layer 3 at the contact surface with the solid layer 2.

Curing of Silicone Rubber, Removal of Mold Next, as shown in FIG. 6 (b), the upper mold 13 is fitted into the mold 12 and heated at a temperature of 120 ° C. for 3 minutes by an appropriate heating means. By doing so, the silicone rubber 7 is cured to form the solid layer 2. At this time, the silicone rubber 7 penetrating into the foam holes 3a on the contact surface of the foam layer 3 with the solid layer 2
Is hardened to a entangled state, and the silicone rubber 7
Thus, the laminated body 1 in which the foamed layer 3 and the solid layer 2 are integrally formed is formed. Incidentally, the pressurization by the upper mold 13 promotes the penetration of the silicone rubber 7 into the foamed holes 3a.

After a lapse of a predetermined time, the pressurized and heated state is released, the molded laminate 1 is taken out of the molds 10 and 12, and the laminate 1 is heated at 150 ° C. for about 1 hour to obtain silicone rubber. 7 is completely cured, and a series of steps of the present manufacturing method ends.

When the mold 12 is placed on the base B on which the mold 10 is placed, the base B
It is necessary to improve the adhesion between the mold 10 and the mold 10 and the adhesion between the mold 10 and the mold 12. I will touch on this point a bit below. First, the base B is formed of, for example, an electromagnetic chuck, and the mold frames 10 and 12 to be attracted by the electromagnetic chuck are formed of a relatively thin iron plate having a thickness dimension. With the mold, formwork 10
And the formwork 12 can be improved in adhesion. As the base B, a permanent magnet chuck, a permanent magnet, or the like that can be expected to have the same effect can be used.

Also, between the base B and the mold 10,
Between the base B and the mold 10, between the base B and the mold 10, and between the base 10 and the mold 12. The contact can also be achieved by providing a separate mechanical engagement means between the two.

A watch band 5 to which the “laminate having a foamed layer” manufactured as described above is applied is a belt-shaped band formed by integrally molding the foamed layer 3 and the solid layer 2 as shown in FIG. Silicone rubber 7 forming the solid layer 2 penetrates into the surface layer (foam hole 3 a) of the foamed layer 3 at the contact surface with the solid layer 2 to form the bonding layer 4.
In addition, the foam layer 3 becomes a contact portion with the skin,
The foamed layer 3 was provided on the silicone rubber 7 (solid layer 2) as projections with the foamed layer 3 interspersed. Then, an engaging hole 5a is appropriately formed in such a band-shaped member, and
The watch band 5 is formed by attaching the b and the like, and is attached to the watch main body 5A.

Incidentally, if a manufacturing method different from that of the present invention is adopted, various problems occur, and this point will be described below. First, when the silicone rubber 7 is cured to form the solid layer 2 before the foam layer 3, the two are merely in surface contact, and the adhesive strength between the solid layer 2 and the foam layer 3 is weakened. Further, if the curing of the silicone rubber 7 and the curing of the foamed silicone 8 are performed simultaneously, the foaming of the foamed silicone 8 is not sufficiently performed, and the feeling of wearing (touch) is deteriorated.

[0037]

Other Embodiments Although the present invention is based on the above-described embodiment, the following embodiments can be adopted based on the technical idea of the present invention.
First, in the above embodiment, the foamed silicone 8
Is formed on the silicone rubber 7 in the form of a projection by forming the foamed layer 3 on the silicone rubber 7. As shown in FIG. It may be formed. The laminate 1 having such a configuration is suitable for being applied to a protector such as a padding, an elbow pad, a knee pad or the like, or an inner sticking of a helmet or the like for the purpose of cushioning. In such a case, an antibacterial material can be mixed into the foamed silicone 8 and the silicone rubber 7. Further, the foamed silicone 8 and the silicone rubber 7 may be mixed with a decorative filler such as a fine glitter or a powdery luminous pigment or a temperature indicator.

In the embodiment of the laminated body 1 having the watch band 5 described above, the foamed layer 3 is formed only on one side of the laminated body 1, but it is a matter of course that it can be formed on both sides. In this case, the foam layer 3 serving as the contact surface with the human body aims at improving the feeling of wearing, whereas the foam layer 3 provided on the opposite surface, that is, the surface, aims at a decorative effect depending on its form. Can be.

The mechanical strength is increased by inserting an appropriate core made of organic polymer fiber, carbon fiber, glass fiber or the like into the solid layer 2 of the band-shaped laminate 1 constituting the watch band 5. It can also be raised. Specifically, in the above-described manufacturing method, when the foamed silicone 8 is buried under the liquid level of the silicone rubber 7 during the injection of the silicone rubber 7 into the mold 12, the core material is The core material is positioned in the silicone rubber 7 (solid layer 2) by further injecting the silicone rubber 7 from above.

In the above embodiment, the foam layer 3
The mold 10 is used as the mold of the mold, and the mold 1 is used as the mold of the solid layer 2.
Using the mold 2 and the upper mold 13, the mold 12 is placed on the mold 10,
Further, a sleep rate type in which the upper mold 13 is fitted is used. However, as shown in FIG. 8, a two-plate mold composed of a mold 12a in which the mold 12 and the upper mold 13 are integrated and a mold 10 is used. May be used. In this case, the foamed silicone 8 is injected into the mold 10, and after the foamed silicone 8 is completely foamed, the silicone rubber 7 is injected into the mold 12a, and the mold 10 and the mold 12a are stacked. By the combination, a part of the solid layer 2 penetrates into the foam holes 3a in the foam layer 3 and is hardened in a entangled state.

[0041]

The present invention provides a laminate having a foamed layer, a watch band, and a method for manufacturing the same, which is realized through the above-described embodiment as an example, and has a contact surface with the skin. Is a foamed layer 3 (foamed silicone 8), it is possible to provide a laminate 1 which can suppress stickiness, peeling, slippage, and the like due to perspiration, has a good wearing feeling, and is excellent in durability. it can.

[Brief description of the drawings]

FIG. 1 is a partially enlarged perspective view showing a watch band according to the present invention.

FIG. 2 is a perspective view showing a laminate in which the form of a foam layer is different.

FIG. 3 is a front view showing a state of mixing a base material, which is a raw material of foamed silicone, and a crosslinking agent.

FIG. 4 is a vertical sectional side view showing a state of injection of foamed silicone into a mold, and a vertical sectional side view showing a state of a squeegee.

FIG. 5 is a vertical sectional side view showing a foamed silicone foamed in a concave portion of the mold, and a longitudinal enlarged side view partially showing a state of injection of silicone rubber into the mold;

FIG. 6 is a vertical sectional side view showing a state of squeegee processing of silicone rubber and a vertical sectional side view showing a state in which an upper mold is fitted in a mold frame.

FIG. 7 is a longitudinal sectional side view showing a state of injection of foamed silicone into a mold by an injection needle.

FIG. 8 is a vertical sectional side view showing a method for manufacturing a laminated body using a two-plate type.

[Explanation of symbols]

 Reference Signs List 1 laminated body 2 solid layer 3 foam layer 3a foam hole 4 bonding layer 5 watch band 5A watch body 5a engaging hole 5b metal fitting 7 silicone rubber 8 foamed silicone 8A base 8B cross-linking agent 10 formwork 10a recess 11 squeegee tool 12 formwork 12a Mold 13 Upper mold 14 Injection needle B Base

Claims (7)

[Claims] 1. A laminated body obtained by integrally molding a foam layer and a solid layer, wherein a part of the solid layer penetrates into a foaming hole of a contact surface of the foam layer with the solid layer, and is entangled. A laminate having a foamed layer, characterized in that the laminate has been cured. 2. The laminate having a foam layer according to claim 1, wherein the foam layer and the solid layer are formed of silicone rubber. 3. A band-shaped laminate formed by integrally molding a foam layer and a solid layer, wherein a part of the solid layer penetrates into a foam hole in a contact surface of the foam layer with the solid layer. A watch band characterized by being entangled. 4. The watch band according to claim 3, wherein the foam layer and the solid layer are formed of silicone rubber. 5. The watch band according to claim 3, wherein the foam layer is provided on a side in contact with the skin, and the foam layer is formed in a protruding shape on the solid layer. 6. A foam material is injected into a mold, the foam material is cured after foaming is completed to form a foam layer having a large number of foam holes, and then filled with a solid material to form the foam layer. A laminate and a watch band having a foamed layer, wherein a foamed layer and a solid layer formed by the solidified material are integrally formed in a entangled state by infiltrating a solid material before hardening into the foamed hole in the above. Manufacturing method. 7. The method according to claim 6, wherein the foamed material is foamed silicone and the solid material is silicone rubber.