JP2003009901A - Rubber sheet for manufacturing boots, and boots employing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide boots made of rubber which are sensible for walking and excellent in durability without spoiling flexibility. SOLUTION: A rubber sheet for manufacturing the boots is made of an integrated rubber sheet with thickness of about 0.5-2.5 mm which is processed in one sheet with a soft unvulcanized rubber and a net sheet made of 20-200 meshes of nylon, polyester, vinylon, acryl, or carbon fiber by topping or doubling. The integrated rubber sheet is cut into suitable sizes for a leg section sheet, an instep section sheet, or the like, which are adhered to the underlining of a woven cloth on a last mold, and the boot is manufactured through vulcanization treatment.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to improvements in working boots and general boots having excellent durability and rubber sheet materials used for manufacturing them.

[0002]

2. Description of the Related Art Most conventional boots mainly for waterproofing are made of rubber or soft PVC which is advantageous in waterproofness and workability. In the case of manufacturing rubber boots, generally, a sock-like backing cloth is attached to the last, a glue is applied to the surface of the backing cloth, and a rubber sheet material having a certain shape is appropriately cut on the backing cloth. And then vulcanized.

[0003]

However, the rubber or soft PVC covering the surfaces of the leg cylinder and the limb of boots has a small resistance to tearing. Especially, in the case of rubber boots, rubber molecules are present in the rolling direction of the rubber sheet. Due to the property that they are arranged in parallel, this tear resistance is extremely small and there is a drawback that they are easily damaged. On the other hand, in order to improve the tear resistance, there is already a material in which a material completely different from the rubber material on the surface, for example, a knitted fabric is sandwiched in the rubber layer. In this case, since the knitted fabric is bonded to the rubber layer using an adhesive such as glue, the strength of the rubber sheet material can be increased, but the stretchability is significantly impaired. There were problems such as making it extremely complicated and restricting the design.

[0004]

The present invention is intended to solve the above problems, and is characterized in that a rubber sheet material for producing boots is made of nylon of 20 mesh to 200 mesh, polyester, vinylon, A mesh sheet made of acrylic or carbon fiber is integrated with soft unvulcanized rubber by topping or doubling, and the wall thickness is 0.5 m.
A rubber sheet having a size of about m to 2.5 mm is prepared, and this is appropriately cut into a leg cylinder portion, a scabbard portion, or the like. Specifically, the fibers used in the reticulated sheet are made 60 denier to 120 denier. According to this
The leg and base parts that make up boots are made of a rubber sheet material that has a high tear resistance by reinforcing a soft rubber by stably holding a highly elastic net-shaped sheet of a fixed shape in the soft rubber. Will be formed in.

Thus, the boots of the present invention are manufactured by mounting a knitted woven cloth as a back cloth on the last, affixing the rubber sheet material for manufacturing the above boots thereon, and then vulcanizing it.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of a rubber sheet 1 according to the present invention, and FIGS. 2A and 2B are development views of a leg cylinder portion 1a and a scabbard portion 1b of a rubber sheet material obtained by appropriately cutting the rubber sheet 1 for boots. In the figure, 2 is a soft unvulcanized rubber, 3 is a mesh sheet, and the rubber sheet 1 is formed by integrating the rubber 2 and the mesh sheet 3.

Here, the mesh sheet 3 is arbitrarily designed as seen in FIGS. 3A and 3B, but it is made of a fiber such as nylon, polyester, vinylon, acrylic or carbon fiber and is usually 20 mesh to 200 mesh in hexagonal shape. It is not formed on the mesh 3a such as a diamond or a rhombus. This mesh 3a is 20
When it is less than the mesh, a predetermined tear resistance is not imparted to the rubber sheet 1, and when it is 200 mesh or more, the rubber sheet 1
It becomes difficult to impart predetermined elasticity to the.

The thickness of the fibers used in the mesh sheet 3 is usually 60 denier to 120 denier. When the thickness of this thread is less than 60 denier, the rubber sheet 1 does not have a predetermined strength. On the contrary, when it is 120 denier or more, the mesh 3a of the mesh sheet 3 becomes conspicuously exposed on the surface of the rubber sheet 1. , It may be a problem that causes discomfort in commercialization. Therefore, the range is 120 denier, but conversely, the range may be increased to obtain a design effect.

By the way, the net-like sheet 3 is formed by superposing the soft unvulcanized rubber 2 from one side surface or both side surfaces by topping or doubling, and then rolling to obtain a wall thickness dimension D of about 0.5 mm to 2.5 mm. The formed rubber sheet 1 is formed. At this time, the mesh sheet 3 is moved into the rubber layer,
It is to be embedded without using any adhesive such as glue. As described above, depending on the mesh spacing and denier, the mesh 3a pattern of the mesh sheet 3 is exposed on the surface of the rubber sheet 1. Become.

Thus, the rubber sheet 1 is made into a rubber sheet material for boots manufacturing, such as a leg cylinder portion 1a and a limb portion 1b as shown in FIGS. 2A and 2B, using a predetermined punching die. .

The leg cylinder portion 1a and the bottom portion 1b constructed as described above are adhered to the back cloth on the shoe mold and vulcanized in the same manner as in the prior art. FIG. 4 shows this state, and the knitted fabric 4 attached to the last 5
The adhesive is applied to the surface of the base material in advance, and each of the leg cylinder portion 1a and the bottom portion 1b is held by hand and is attached while being appropriately pulled. Turn into. At this time, the reticulated sheets 3 in the leg tube portion 1a and the scabbard portion 1b can flexibly cope with the pulling force in an arbitrary direction without any trouble, and therefore the sticking work can be performed accurately and quickly without difficulty. It will be possible. FIG. 5 is a perspective view of the vulcanized molded boots 6 as described above.

The inventor of the present invention tried the mechanical strength of the rubber sheet 1 having the above structure as follows. With respect to the rubber sheet 1 containing the reticulated sheet 3 and the rubber sheet made of only ordinary soft rubber, the number of flexures until crack initiation was tested and measured using a demacher flexure tester. As a result, while a normal rubber sheet was cracked after being bent 100,000 times, the rubber sheet 1 of the present invention had to be bent at least 400,000 times before cracking.

[0013]

The present invention is constituted as described above, and the rubber sheet for producing boots according to the present invention is said to be one in which a specific mesh and a denier mesh sheet are integrally interposed with a soft unvulcanized rubber. Therefore, the net-like sheet is a material that greatly improves the tear resistance of the rubber sheet, and since the net-like sheet does not cause any trouble in the elasticity, which is the original characteristic of rubber, This molding work can also be performed simply and quickly as in the past. Thus, the boots using the above rubber sheet material can be put on the market with a reticulated sheet, which is easy to wear and has excellent durability without sacrificing flexibility compared to conventional products. It was

[Brief description of drawings]

FIG. 1 is a perspective view of a rubber sheet according to the present invention.

FIG. 2 shows a rubber sheet material for producing boots according to the present invention, in which A is a development of a leg tube portion and B is a development view of a scabbard portion.

FIG. 3 is a schematic view of a mesh sheet according to the present invention.

FIG. 4 is a state diagram of the manufacturing operation of the boots according to the present invention.

FIG. 5 is a perspective view of a boot according to the present invention.

[Explanation of symbols]

1 rubber sheet 1a Leg base 1b Ichibechi 2 Soft unvulcanized rubber 3 mesh sheet 3a mesh 4 woven fabric 5 last 6 boots

Claims (3)

[Claims] 1. A mesh sheet made of nylon, polyester, vinylon, acrylic or carbon fiber of 20 mesh to 200 mesh is integrated with a soft unvulcanized rubber by topping or doubling to have a wall thickness of 0.5 mm to 2.
A rubber sheet material for boots manufacturing, characterized in that a rubber sheet having a size of about 5 mm is prepared and cut into a leg tube portion, a scabbard portion or the like as appropriate. 2. The fibers used in the mesh sheet are 60 denier or more.
The rubber sheet material for producing boots according to claim 1, wherein the rubber sheet material has a denier of 120. 3. A boot, characterized in that the rubber sheet material for manufacturing boots according to claim 1 or 2 is adhered to a back cloth of a woven fabric on the last and vulcanized to manufacture.