JP3155635B2 - Seat with excellent strength ears - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet used in agriculture, forestry, civil engineering, construction, and other fields for preventing falling of materials, curing, wind protection, sand protection, insect control, and the like.

[0002]

2. Description of the Related Art Conventionally, in the fields of agriculture, forestry, civil engineering, construction, etc., prevention of falling of materials, prevention of scattering of dust and paint, curing,
Various sheets, such as canvas, tarpaulins, or mesh sheets, are used for windproof, sandproof, and the like. Each of these sheets has a structure in which a base material obtained by knitting and weaving a yarn having no fusion property by high frequency or heat treatment is coated with a synthetic resin having fusion property by high frequency or heat treatment. is there.

[0003] For convenience of handling these sheets,
Manufactured as a unit sheet with predetermined dimensions, the ends are double-folded for reinforcement and sewn with a sewing machine, reinforcing tapes and reinforcing ropes are inserted as necessary, and metal Stop fittings are installed. However, the double-folded ends of these sheets are simply sewn, and their bonding strength is not sufficient. Therefore, when used in the above-mentioned applications outdoors, there is a disadvantage that the ears are easily damaged.

[0004] In addition, the reinforcement rope and the sheet itself or the reinforcing tape are joined only by sewing at four corners of the sheet, and in other parts, the reinforcement rope and the sheet itself or the reinforcing tape are joined. Did not.
Therefore, when a strong force is applied to the ears such that the metal fittings fall off, the reinforcing rope easily falls off and does not fulfill the reinforcing effect.

[0005] In particular, in the case of a mesh sheet having a coarse mesh in which yarns are woven, when the ends of the mesh sheet are folded and sewn, the density of the yarns in the mesh sheet itself is low, so that the sewing thread has a mesh shape. Since the sewing thread is not easily entangled with the thread of the sheet and the sewing thread is easily pulled out, the strength of the ear portion is insufficient and there is a drawback such as breakage.

[0006] There are usually two types of sewing methods in the case where sewing is performed by folding the end portion, namely, a lockstitch method and a chain stitch method.
A stitch type that is formed of a group of books or more yarns, and the yarns of those groups are generally characterized by lacing other yarns. Is bad. On the other hand, the chain stitching method is a stitch type characterized by forming a self-thread looping with one or more needle threads, and has higher productivity but lower joining strength at a sewn portion than the main sewing method. For this reason, when sewing the ears of the mesh sheet, there is a problem that the chain stitching method with excellent productivity cannot be adopted.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and is made by using an improved reinforcing rope for the ear portion of the seat to provide an ear having excellent strength. It is an object to provide a sheet having a portion.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a base made of a yarn having no fusion property by high frequency or heat treatment, by using a high frequency or heat treatment. Having a lug formed by folding the end of a sheet-like base material coated with a synthetic resin into a double or more, and surrounding the lug with no high-frequency or heat-fusible yarn A reinforcing rope formed by coating a synthetic resin having a fusibility by high frequency or heat treatment is attached to the sheet, and the sheet-like base material and the reinforcing rope are fused by melting of the synthetic resin by high frequency or heat treatment. It is characterized by being integrated into a single piece.

According to a second aspect of the present invention, a base material composed of a yarn having no fusion property by high frequency or heat treatment is coated with a synthetic resin having fusion property by high frequency or heat treatment. Has a lug formed by folding the end of the sheet-shaped base material into two or more, and the lug has a core yarn having no fusing property by high frequency or heat treatment and a fusing property by high frequency or heat processing. The sheet-like base material and the reinforcing rope are attached to each other by the fusion of the fused yarn constituting the reinforcing rope by high-frequency or heat treatment. It is characterized by being integrated by fusion.

[0010]

The sheet of the present invention comprises a reinforcing rope having a lug covered with a synthetic resin having a fusibility by high frequency or heat treatment or a core yarn having no fusibility by high frequency or heat treatment. Attaching a reinforcing rope formed by combining a fusion yarn having a fusion property by a heat treatment,
Since the synthetic resin coated on the reinforcing rope is melted by high frequency or heat treatment to fuse and integrate the sheet-shaped base material and the reinforcing rope, the reinforcing rope attached to the ears is applied to the sheet-shaped base material. The sheet-like base material is not fixed and does not fall off or come off due to external force, and the external force applied to the sheet-like base material can be reliably supported by the ears.

[0011]

EXAMPLE Polyester multifilament (1000
Denier, 95 single yarns) are used for warp and weft, and mosha weave is woven at a density of 23.4 × 24 (books / 25.4 _mm ) to obtain a coarse base cloth having a base cloth weight of 220 / m ^2. Created. 210 g / m2 of polyvinyl chloride resin on the coarse base cloth
² to form a sheet-like substrate having a mesh with a yarn interval of 1.2 to 1.8 _mm , and using this sheet-like substrate, a mesh sheet A as shown in FIG. 1 is prepared. did.

That is, the edge of the sheet-like substrate 1 is
Ester multifilament 250 denier (4 single yarns)
8 lines) at a density of 22 × 24 (lines / 25.4)_mm) Plain weave
Reinforced base fabric coated with polyvinyl chloride resin on both sides
Tape (base cloth weight 50g / m ^Two, Polyvinyl chloride resin
356 g / m^Two0.35 thick_mm) Turn around 2
At the same time, the reinforcement of
The folded part of the sheet-like substrate with the rope 3 interposed
After suturing with thread 4 and performing the following heat treatment,
5 was cast to form a mesh sheet A.

The reinforcing rope 3 was a three-ply polypropylene rope having a thickness of 4 _mm and coated with a polyvinyl chloride resin. The method of coating the polyvinyl chloride resin is not particularly limited, but a method of impregnating a rope with a plastisol, organosol or emulsion of the polyvinyl chloride resin and then heating and gelling the resin may be used.

The sewing thread 4 uses a polyester # 8 spun yarn (referred to as a sewing thread Y) and the polyester thread # 8 spun yarn coated with a polyvinyl chloride resin (referred to as a sewing thread R). A prototype was made using.

The sewing method is a lockstitch method (JIS, L012).
0. Indication symbol 30 by stitch type classification and indication symbol
The folded portion of the sheet-like base material was sewn by two types of 1) and the chain stitching method (the above-mentioned JIS display symbol 102).

The metal fitting 5 is made of brass # 28 and has an inner diameter of 12 mm.
_mm was cast. The heat treatment conditions are as follows. For the case where the sewing thread 4 is made of polyester # 8 spun yarn, a hot air welding machine is used, the hot air temperature is 600 ° C., and the feed speed of the base cloth is 10 m.
/ Min. To treat the reinforcing rope attachment portion and melt the polyvinyl chloride resin adhered to the sheet-like base cloth, the reinforcing rope, etc., as shown in FIG.
And the sheet-like substrate 1 was fused and integrated with the polyvinyl chloride resin layer 6.

On the other hand, for a polyester yarn # 8 spun yarn coated with a polyvinyl chloride resin, a hot air welding machine was also used at a hot air temperature of 600 ° C. and a base fabric feed speed of 10 m / min. The reinforcing rope attachment portion and the sewing portion are processed to melt the polyvinyl chloride resin adhered to the sheet-like base cloth, the reinforcing rope, and the like, and the sheet-like base material 1, the reinforcing tape 2, the reinforcing rope 3, and the sewing thread R Were fused and integrated with a polyvinyl chloride resin. As a comparative example, a sheet-like base material, a reinforcing tape, a metal fitting, and the like are the same as those in the above-described example, and a reinforcing rope is made of polypropylene 3
4 _mm thick rope (not coated with synthetic resin)
Using # 8 spun yarn made of polyester for sewing thread,
Sewing was performed according to the lockstitch method (the above-mentioned JIS display symbol 301), and a mesh sheet X was prepared without performing heat treatment (conventional method).

Regarding the thread change at the time of sewing, in the case of the lockstitch method, the lower thread (# 8 spun thread) can be wound around the bobbin only 20 m, so it is necessary to interrupt the sewing once every 20 m to change the thread. . On the other hand, in the chain stitching method, since the lower thread is not used, it is not necessary to interrupt the sewing for thread change, and the productivity is excellent.

The strength of the ears of the mesh sheets of the above Examples and Comparative Examples was measured, and the following results were obtained. Measuring method: Based on the test method determined by the Japan Temporary Industrial Association, the strength of the fitting part in a tensile test was measured for each of five samples, and the average value was calculated. Sample Strength of the stop portion Mesh-shaped sheet A Example 1: Lock stitching method using sewing thread Y 180.0 kg Example 2: Chain stitching method using sewing thread Y 172.0 kg Example 3: Lock sewing method using sewing thread R 205 0.0kg Example 4: Chain sewing method with sewing thread R 202.0 kg Mesh-shaped sheet X Comparative example: Lock sewing method with sewing thread Y 147.0 kg

As is apparent from the results, Examples 1 to 4 of the present invention are considerably superior to Comparative Examples in which reinforcing ropes not coated with a synthetic resin are sewn by the lockstitch method as conventional products. It shows the strength of the turtle. Therefore, according to the present invention, it is possible to use a highly productive chain stitching method for sewing ears, and it is possible to efficiently create a mesh sheet having ears with high strength.

Next, a second embodiment of the present invention will be described. Except for the reinforcing rope, a mesh-like sheet was formed using the materials used in the above examples. That is, at the end of the sheet-like base material used in the above-described example, the reinforcing tape of the above-described example was sandwiched and folded, and a reinforcing rope having the following configuration was interposed in the folded-back portion of the reinforcing tape, and the sheet-like base material was formed. The folded portion was sewn with the sewing threads Y and R of the above-described embodiment, and heat-treated under the following conditions, and then the metal fittings 5 were driven and four types of mesh sheets B (Examples 5 to 8) were used. It was created.

The reinforcing rope includes two polypropylene flat yarns (width: 5 cm, thickness: 30 μm) as a core yarn having no fusibility due to high frequency or heat treatment, and a fusible yarn having fusibility due to high frequency or heat treatment. As polyvinyl chloride resin flat yarn (width 5cm, thickness 30μ)
m) 3 strands obtained by combining and twisting one strand and having a thickness of 4
_mm rope was used.

The heat treatment was carried out using the same hot air welding machine as in the above embodiment, with a hot air temperature of 600 ° C. and a feed speed of the base cloth of 10 m.
/ Minute to treat the reinforcing rope attachment part and the sewing part, melt the polyvinyl chloride resin adhered to the sheet-like base cloth and the reinforcing rope, etc., and make the sheet-like base material, the reinforcing tape, the reinforcing rope and the sewing thread R Were fused and integrated with a polyvinyl chloride resin.

The strength of the ears of each of the mesh sheets B was measured, and the following results were obtained. Measuring method: Based on the test method determined by the Japan Temporary Industrial Association, the strength of the fitting part in a tensile test was measured for each of five samples, and the average value was calculated. Specimen Stopper strength Reticulated sheet B Example 5: Lock stitching method using sewing thread Y 178.0 kg Example 6: Chain stitching method using sewing thread Y 169.0 kg Example 7: Lock stitching method using sewing thread R 203 0.08 kg Example 8: Chain sewing method using sewing thread R 190.0 kg Mesh-shaped sheet X (same as the above-mentioned example) Comparative example: Lock sewing method using sewing thread Y 147.0 kg

As is apparent from the results, the mesh sheet B of the present invention (Examples 5 to 8) is a conventional product in which a reinforcing rope not coated with a synthetic resin is sewn by a lockstitch method. It shows a much better snapping strength than the sheet X (Comparative Example). In addition, it is possible to use a highly productive chain stitching method for sewing the ears, and it is possible to efficiently create a mesh sheet having high strength ears.

In each of the above embodiments, when forming the ears of the sheet-like base material in order to improve the strength of the ears of the mesh-like sheet, a reinforcing tape, a metal fitting, or the like was used. The mesh sheet of the present invention may form the ear without necessarily using these members.

Further, the position where the reinforcing tape 2 is sewn is not limited to be folded over the end of the sheet-like base material 1 as shown in FIGS.
As shown in FIG. 4, the reinforcing tape 2 may be interposed between the bent end portions of the sheet-like base material 1, and as shown in FIGS. The reinforcing tape 2 may be superimposed on the top and bottom of the part or below the end. Further, as shown in FIG. 7, the reinforcing tape 2 may be put on the outside of the sheet-shaped base material 1 where the end portion is bent and sewn.

[0028]

The sheet of the present invention has an ear portion in which the sheet-like base material and the reinforcing rope constituting the sheet are fused and integrated by melting the synthetic resin, so that the strength of the ear portion is remarkably excellent. I have. In addition, since high strength can be obtained by using either the lockstitch method or the chain stitch method as the sewing method when suturing the ears, it is possible to sew with the highly productive chain stitch method, and the sewing process. After that, there is an advantage that the production can be efficiently performed only by adding a high frequency or heat treatment step.

[Brief description of the drawings]

FIG. 1 is a perspective view of a mesh sheet showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the mesh sheet of FIG.

FIG. 3 is an explanatory view showing an example of a sewing position of a sheet base material and a reinforcing tape according to the present invention.

FIG. 4 is an explanatory diagram showing an example of a sewing position of a sheet base material and a reinforcing tape according to the present invention.

FIG. 5 is an explanatory diagram showing an example of a sewing position of a sheet base material and a reinforcing tape according to the present invention.

FIG. 6 is an explanatory view showing an example of a sewing position of a sheet base material and a reinforcing tape according to the present invention.

FIG. 7 is an explanatory view showing an example of a sewing position of a sheet base material and a reinforcing tape according to the present invention.

[Explanation of symbols]

 A mesh-like sheet 1 sheet-like base material 3 reinforcing rope

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) D06C 25/00 B32B 27/12

Claims (2)

(57) [Claims] 1. An end portion of a sheet-like base material obtained by coating a base material composed of a thread having no fusion property by high frequency or heat treatment with a synthetic resin having fusion property by high frequency or heat treatment. It has ears formed by folding back more than twice, and the ears are coated with a synthetic resin having a fusion property by high frequency or heat treatment around a yarn that does not have a fusion property by high frequency or heat treatment. Characterized in that the reinforcing rope is attached to the sheet-shaped base material and the reinforcing rope are fused and integrated by melting the synthetic resin by high frequency or heat treatment. Sheet having a portion. 2. An end portion of a sheet-like base material obtained by coating a base material composed of a thread having no fusion property by high frequency or heat treatment with a synthetic resin having fusion property by high frequency or heat treatment. It has an ear portion formed by folding back more than two times, and the ear portion is made of a core yarn having no fusibility due to high frequency or heat treatment and a fusible yarn having fusibility due to high frequency or heat treatment. The sheet-like base material and the reinforcing rope are fused and integrated by fusion of a fusion yarn constituting the reinforcing rope by high frequency or heat treatment. A sheet with excellent strength ears.