JPH10337797A - Closed cell foamed sheet, life jacket and amphibious work clothes - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a closed cell foamed sheet practically used as raw material having excellent flexibility and fashionability for clothing utility by incorporating excellent performance for all flexibility, fitness, cushionability and degree of freedoms of form and incorporating a plenty of fitness to cushionability and various foams, further life jacket, wet suits and amphibious work clothes made of it. SOLUTION: The closed cell foamed sheet is a closed cell foamed sheet having a thickness of 1 mm or more, cut lines at least in two directions of at least one surface of the sheet so that line density of the cut lines 2 is 0.5 to 8 pieces/cm and a line width of the line 2 is at least 1 mm. And, the life jacket, wet suits and amphibious work clothes are constituted by such closed cell foamed sheet.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to cushioning, which is excellent in flexibility and fit, and has a large degree of freedom in form.
The present invention relates to an independent foam sheet having excellent heat retaining properties and buoyancy functions, and further relates to a life jacket, a wet suit, and an amphibious work suit using the same.

[0002]

2. Description of the Related Art Foam sheets have been conventionally used as cushioning materials, heat insulating materials, and buoyant bodies, and are commercially available as packaging materials, civil engineering materials, and even life jackets.

[0003]

However, the independent foam sheets, which are employed in the prior art, have been employed and used as they are without changing the surface shape. There is no one that considers sex, freedom of form, and the like.

[0004] Therefore, the conventional life vest has only a poor fashionability to the extent that a floating bag is attached, and cannot be practically used as clothing.

The present invention has been made in view of the background of the prior art.
It has excellent performance in all of flexibility, fit, cushioning and form flexibility, and is rich in cushioning and fitting to various forms, and also excellent in flexibility and fashion for clothing. An object of the present invention is to provide a self-supporting foam sheet which can be used as a material, and further to provide a life jacket, a wet suit, and an amphibious work suit comprising the same.

[0006]

The present invention employs the following means in order to solve the above-mentioned problems. That is, the independent foam sheet of the present invention is an independent foam sheet having a thickness of 1 mm or more, and has a cut line in at least two directions on at least one surface of the independent foam sheet, and a linear density of the cut line. 0.5 to 8 /
cm, and the line width of the cut line is at least 1 mm, and the life jacket, the wet suit and the amphibious work suit of the present invention are constituted by such a independent foam sheet. It is characterized by having.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention has been studied diligently with respect to the above-mentioned problems in the prior art. The inventors have sought to improve the facts and arrived at the present invention.

[0008] When the cut line is inserted in one direction,
Only the direction orthogonal to the cut line is softened, and if it is inserted in two or more directions, such as a biaxial direction, it is softened in the two or more directions.

The independent foam sheet referred to in the present invention includes polyethylene, polypropylene, polyethylene vinyl ester, polystyrene, polyvinyl acetate, polyvinyl chloride, polyvinylidene chloride, polyamide, polyester,
Thermoplastic resins such as polymethyl methacrylate and copolymers thereof, and also elastomers such as polyurethane,
Rubbers such as various synthetic rubbers and various natural rubbers can be used.

[0010] The independent foam sheet may be either a continuous body or a sheet obtained by a batch method, and may be a sheet sliced to a required thickness. Furthermore, in such an independent foam sheet, handling properties such as cutting, lamination, and adhesion can be handled in the same manner as a normal foam sheet, so that existing equipment can be used as it is.

In the present invention, as such a closed foam sheet, a sheet having a thickness of at least 1 mm is used, preferably a sheet having a thickness of 5 to 30 mm, more preferably 10 to 25 mm. The thickness of the sheet is increased or decreased depending on the application. For example, when a thick sheet is desired, a plurality of independent foamed sheets with cut lines according to the present invention are laminated as they are and used at a desired thickness. Is preferred.

Although such cut lines are used in at least two directions, cut lines may be provided in more directions. The linear density of such cut lines is 0.1 lines / cm or more, preferably 0.5 lines / cm to 8 lines / cm, more preferably 1 line / cm to 3 lines / cm. It is used because of its flexibility, fit, cushioning and form flexibility.

If it is less than 0.5 / cm, the block pieces separated by the cut lines become too large, and when the sheet is bent, it becomes polygonal and the adhesion to the body deteriorates, which is not good. On the other hand, if it exceeds 8 fibers / cm, the amount of the remaining independent foam is greatly reduced, so that the properties of the independent foam such as buoyancy are hardly exhibited, which is not preferable.

The line width of the cut line is at least 1
mm, preferably 1.5 to 3 mm, is used in terms of flexibility, fit, cushioning and freedom of form. If the line width of the cut line is less than 1 mm, when the sheet is bent, the heads of the adjacent convex portions come into contact immediately, making it difficult to cope with bending with a small curvature.

The depth of the score line is preferably 0.2 to 0.9 with respect to the thickness of the closed cell sheet used.
A ratio of 5 and more preferably a ratio of 0.7 to 0.9 is good from the viewpoint of flexibility and tensile strength at break.

The pattern formed on the independent foam sheet surface of the cut line may be a pattern formed separately in two or more directions, but is preferably a lattice or mosaic. However, from the viewpoint of the above-mentioned effects, it is preferable to use a vertical line, a horizontal line, or an oblique line from the viewpoint of ease of machining. However, if possible, an aggregate of partial lines, for example, a hexagonal shape, or any other shape such as a polygonal shape or a circular shape, does not cause any special functional problem.

It is preferable that at least one of the cut lines is cut in a tapered shape, because it can cope with bending with a smaller curvature and can provide a flexible sheet.

Next, the independent foam sheet of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view showing a part of the closed cell sheet of the present invention.

1 is an independent foam sheet, 2 is a cut groove,
Reference numeral 3 denotes a fabric body bonded to the independent foam.

The cloth body may or may not be used, and may be appropriately used depending on the application.

FIG. 2 shows other cut line patterns. FIG. 3 shows an example of a means for forming a score line. Reference numeral 4 denotes a cutting blade which is usually a metal disk. In forming the cut line, a cut line having a width corresponding to the thickness of the disk can be obtained by rotating and moving the disk.

FIG. 4 is a diagram showing the shape of the cutting blade in which the shape of the cutting blade is tapered, and the shape in which the tip of the cutting blade is rounded and R-shaped. Thus, the cross-sectional shape of the cut line is freely determined by the cross-sectional shape of the disk.

The independent foam sheet of the present invention can be combined with a fibrous structure such as a cloth or a sheet, if necessary. By laminating and combining such a fiber structure on the cut surface and / or the opposite surface, the application range of the independent foam sheet can be greatly expanded. Particularly, it is extremely practical to bond and composite a cloth on the surface opposite to the cut surface. It is preferable to use a fiber structure material, a lamination method, an adhesion method, and the like that are taken into consideration in order to maintain the flexibility of the closed cell sheet. For example, as such a fibrous structure, a thick and dense woven fabric itself has high rigidity, and when such a material is compounded, the flexibility of the independent foam sheet is impaired, which is not preferable. Rather, knitted or woven fabrics that are extremely thin and have a low basis weight and excellent flexibility are preferred.

On the other hand, it is necessary to apply the bonding method in the same way as to minimize the rigidity of the adhesive itself. For example, it is preferable to use a flexible material for the adhesive after curing. Further, the adhesive does not necessarily need to be applied on the entire surface, and may be applied in a mesh shape, a dot shape, or the like which is a partial application without impairing the flexibility of the independent foam sheet. In addition, a frame bonding method that does not use an adhesive can be adopted.

Here, a method of measuring the flexibility of the independent foam sheet will be described. First, as a sample, the independent foam sheet of the present invention was cut into 30 cm x 63 cm,
This is formed into a cylindrical shape with the side where the cut lines exist on the outside. The butted portion is firmly adhered with an adhesive. On the other hand, an unprocessed product is also prepared in a cylindrical shape in the same manner.

As described above, the sheet having a cut line in the independent foam sheet of the present invention certainly has a loss of buoyancy at the cut line portion, but this is extremely small, and the degree of form freedom is further increased. The effect of the dramatic improvement is enormous. Life vests (including bulletproof life vests) and amphibious work clothes can be considered as applications that make the most of this effect. Regardless of current life vests or amphibious work clothes such as wet suits, buoyant bodies are mostly thick plate-shaped independent foam sheets, so their own flexibility is extremely poor and rugged, for example Most are unable to move freely even if they try to lean forward. On the other hand, the independent foam sheet of the present invention has excellent operability such that it can move freely and does not make the user feel worn.

Another application of the closed cell sheet of the present invention is also effective as a backing material for rugs. Normal,
A foam having cushioning properties is stuck on the entire surface as a backing material. In this case, there was a problem that the bimetal effect was developed and the sheet itself was warped. However, if the independent foam sheet of the present invention was used, the expansion coefficient was increased. The degree of expansion and contraction due to the difference is effective in preventing warpage due to absorption by the structure. The independent foam sheet of the present invention can be used by winding it many times, for example, when laminating it on a pipe. There is an advantage that no warping occurs. The independent foam sheet of the present invention can be cut or laminated by using the existing equipment as it is.

The independent foam sheet of the present invention can be widely applied and developed as a material for ordinary clothing utilizing heat retention as a use other than the above, or as a material for civil engineering and construction.

[0030]

The present invention will be described below in more detail with reference to examples.

Example 1 "Pef 3020BNO" manufactured by Toray Co., Ltd.
Using a 60 cm × 60 cm flat plate. The cutting line forming conditions are 2mm thickness and 200cm diameter.
φ metal disks are arranged at 2cm intervals, and the rotation speed is 50rpm.
The process speed was set to 10 m / min, and the cut depth was set to 18 mm. The independent foam sheet was passed through in the vertical and horizontal directions to obtain an independent foam sheet having a grid-shaped cut line. .

To measure the flexibility of this independent foam sheet, the sheet was rolled to form a cylinder having a diameter of 30 cm and a height of 30 cm, and the buckling stress was measured according to the following measuring method.

That is, the buckling stress is measured using an autograph (constant speed tensile tester), and the sample is compressed, and the value of the first yield point of the generated stress is defined as the buckling stress. First
If the next yield point is not clear, the stress at the time of 3 cm compression is defined as the buckling stress. A metal plate of 30 cmφ corresponding to a cylindrical cut is attached to the autograph so that a cylindrical sample can be uniformly compressed. The compression speed was set at a constant speed of 10 cm / min. The obtained buckling stress was 150 g.

Comparative Example 1 The buckling stress was measured by performing the same operation as in Example 1 except that the independent foam sheet of Example 1 was not cut. The obtained buckling stress was 4100 g, which means that the flexibility was 25 times or more different from that of Example 1.

[0035]

According to the present invention, taking advantage of the feature of having flexibility in various directions, it can be used for life vests, waterfront work and underwater work, for example, work clothes such as wet suits and onboard ships. It can be used effectively as work clothes.

[Brief description of the drawings]

FIG. 1 is a partial perspective view of a closed foam sheet of the present invention.

FIG. 2 is a schematic diagram showing patterns of various cut lines.

FIG. 3 shows an example of a means for forming a score line.

FIG. 4 shows a cross-sectional shape of a typical cutting blade when forming a cutting line.

[Explanation of symbols]

1: Block piece of independent foam separated by a cut line 2: Cut line 3: Cloth bonded to the back of the independent foam 4: Cut blade

Claims (11)

[Claims] An independent foam sheet having a thickness of 1 mm or more, wherein the independent foam sheet has cut lines in at least two directions on at least one surface, and the cut line has a line density of 0.1 / line. cm, and the cut line has a line width of at least 1 mm. 2. The method according to claim 1, wherein the cut lines are provided in a lattice or mosaic pattern.
The independent foam sheet as described in the above. 3. The independent foam sheet according to claim 1, wherein the cut line is formed by cutting at least one of the cut lines into a tapered shape. 4. The closed-cell foam according to claim 1, wherein the cut line has a depth of 0.2 to 0.95 of the thickness of the closed-cell sheet. Body sheet. 5. The independent foam sheet according to claim 1, wherein a fiber structure is laminated on at least one surface of the independent foam sheet having the score lines. 6. The independent foam sheet according to claim 1, wherein said independent foam is made of a thermoplastic resin and a copolymer thereof, an elastomer and rubbers. 7. The independent foam sheet according to claim 1, wherein said independent foam is a material for clothing. 8. The independent foam sheet according to claim 1, wherein said independent foam is a material for civil engineering and construction. 9. A life jacket made of the independent foam sheet according to any one of claims 1 to 6. 10. An amphibious work suit comprising the independent foam sheet according to any one of claims 1 to 6. 11. The amphibious work suit according to claim 10, wherein the amphibious work suit is a wet suit.