JPH01321947A - Netty product - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Fields] The present invention is suitable for use in various fields as it is a net-like material produced by weaving, in particular, it does not cause slippage or unraveling from the edges, and it is easy to heat seal. This relates to the net-like material used.

[Prior Art] Net-like materials made of flat yarns or monofilament yarns have been widely used in various fields.

For example, in the agricultural field, net-like fabrics made of flat yarns or monofilament yarns are used for light-shielding nets, cheesecloth, windproof nets, insect-proof nets, vegetable packaging nets, and others.

In addition, in the construction and civil engineering field, paint scattering prevention nets,
Net-like fabrics made of flat yarns or monofilament yarns similar to those described above are often used in vegetation nets and other applications.

[Problems to be Solved] However, in the flat yarns and monofilament yarns used in these yarns, both the warp and weft are made of a single material, and the intersection of the warp and weft is not bonded.

As a result, the thread spacing may be relatively large, creating a net-like shape, and the bond between the warp and warp threads is weak, resulting in scratches or unraveling at the ends of the product, especially at the cut ends. Therefore, in order to prevent these misalignments and unraveling, it has been necessary to perform some kind of processing such as sewing or adhesive processing.

Therefore, it was decided to thermally bond the intersections of thermoplastic resin flat yarns or monofilament yarns used for the warp and weft yarns. There is a risk that the stretching effect and strength will be reduced, and when used after heat-sealing, the strength of the heat-sealed portion will be poor and there will be problems with durability.

In view of the above, the present invention uses a flat yarn or monofilament yarn with a special composite structure for both the weft and warp yarns, thereby making it possible to thermally bond the intersecting portions of the weft and warp yarns to form a strong bond, thereby preventing misalignment and edges. It is an object of the present invention to provide a net-like material that does not unravel, is easily heat-sealable, has sufficient strength, is excellent in durability, and can be suitably used for various purposes.

[Means for Solving the Problems] As a means for solving the above problems, the present invention provides a flat yarn with a three-layer structure, in which the polymer melting point or softening point of the outer layer is 10° C. higher than the polymer melting point or softening point of the core layer. It is characterized in that it is made by weaving a composite flat yarn consisting of the above-described lower yarns for both warp and warp yarns, and thermally bonding the intersections of the warp and warp yarns at a temperature equal to or higher than the softening point of the polymer in the outer layer.

In addition, in place of the composite flat yarn described above, the present invention provides a monofilament yarn having a two-layer structure of a core and sheath, which has a polymer melting point or softening point of the sheath layer that is lower than the polymer melting point or softening point of the core layer by 10°C or more. It is also possible to weave a composite monofilament yarn consisting of warp and weft yarns, and thermally bond the intersections of the weft and warp yarns at a temperature higher than the softening point of the polymer in the sheath layer.

Furthermore, the present invention uses the composite flat yarn as one yarn of the warp and warp yarns and the composite monofilament yarn as the other yarn, and weaves both the warp and weft yarns at a temperature equal to or higher than the softening point of the polymer of the outer layer or sheath layer. The intersection can also be thermally bonded.

According to the net-like article of the present invention having the structure described in "Function C" 1, the weft and weft yarns are arranged such that at their intersections, the outer layers of the composite flat yarn or the sheath layers of the composite monofilament yarn are bonded to each other. The outer layer and the sheath layer are integrally bonded to each other. Therefore, even though the comparison piece has a coarse net shape, there is no risk of the opening becoming loose or the edges of the fabric coming undone. Moreover, since the warp and warp yarns are joined by the outer layer or sheath layer, the strength required for use can be maintained without reducing the effect of stretching the core layer or the core layer.

In addition, in the heat sealing process according to the usage of the net-like material, since the outer layer or sheath layer of the composite flat yarn or composite monofilament yarn used for both warp and weft yarns appears on the surface, the softening point is lower than that of the composite flat yarn or composite monofilament yarn. Even if the high core layer or core layer is not affected, it can be easily heat-sealed by the outer layer or sheath layer, and the strength of the sealed portion can also be ensured by the core layer or the like.

[Example code] Next, embodiments of the present invention will be described based on the drawings.

FIGS. 1 and 2 show an example of the net-like article (A) of the present invention, which is woven using a three-layer composite flat yarn (1) for both weft and weft yarns.

The composite flat yarn (1) is composed of a polymer in which the outer layer (1a) has a polymer melting point or softening point that is 10°C or more lower than the polymer joint point or softening point of the core layer (1b), and this composite flat yarn (1) After weaving, the outer layer (1a) is heated to a temperature above the polymer softening point of the outer layer (1a), preferably below the polymer melting point of the core layer (1b).
In a softened state of 1a), the intersection part (2) of both warp and weft yarns is bonded by bonding the outer layers (la) and (la).

The composite flat yarn (1) used in the net-like material (A) is produced by, for example, supplying the respective molten polymers of the outer layer and the core layer to one die, and fusing each polymer layer inside the die. It is obtained by forming a film, slitting the obtained multilayer film to a certain width, and further stretching this to impart strength. In some cases, the multilayer film described above is uniaxially stretched and then slit into narrow widths.

In either case, the outer layer (1a) is necessarily the core layer (1a).
The core layer (1b) does not need to be the same polymer as b).
Any material having a melting point or softening point lower than the melting point or softening point of 10°C or more is sufficient.

As the core layer (1b), for example, high density polyethylene,
Examples include thermoplastic resins and other polymers such as polyvinyl chloride, polystyrene, polyvinyl alcohol, polyacrylonitrile, polyvinylidene chloride, polyamide, polyester, and copolymers belonging to these series.

Further, as the outer layer (1a), in combination with the polymer of the core layer (1b), the melting point or softening point is lower than that of the core layer (1b) by 10°C or more, such as low density polyethylene, ethylene-acetic acid. Examples include vinyl copolymers and ethylene-acrylic acid copolymers.

In the case of this net-like material, since the weft and weft yarns or their intersections (2) are thermally bonded by the outer layer (1a) of the composite flat yarn (1), no misalignment occurs, and the ends of the weft and weft yarns due to cutting etc. There is no risk of unraveling, and the core layer (LLB) is not affected by thermal bonding to a large extent.
This provides sufficient strength. Especially the outer layer (1a
), it becomes easy to heat-seal the net-like material itself, and there is no fear that the strength of the sealed portion will decrease.

Furthermore, since the surface of this net-like material is relatively flat, it has a good feel to the touch and can be particularly suitably used as a bag such as a drainage bag.

Further, the embodiment shown in FIG. 3 is a composite monofilament yarn having a two-layer structure of a core and sheath.
The figure shows the case of a net-like article woven using a composite monofilament yarn 11) whose polymer melting point or softening point is 10°C or more lower than the melting point or softening point of the core layer (llb) for both warp and warp yarns. There is. Similarly to the above, this net-like material is woven with the composite monofilament yarn (11) and then heated at a temperature above the polymer softening point of the sheath layer (lla), preferably below the polymer melting point of the core layer (llb). It's glued.

That is, the sheath layer (lla) is softened and the sheath layers (lla) are bonded to each other at the intersection (2) of both the warp and weft threads.

Therefore, there is no misalignment, there is no fear of unraveling from the edges, etc., and the core layer (llb) has sufficient strength, and furthermore, the heat sealability is good.

In addition, the above composite monofilament yarn (11) is produced by supplying the molten polymers of both the core and sheath layers to one die, fusing the core and sheath layers inside the die, and then drawing the composite monofilament yarn (11), as in the case of the above composite flat yarn. It is obtained by stretching a monofilament to add strength. The outer sheath layer (lla) and lla do not necessarily have to be made of one type of polymer, as long as they contain a polymer whose melting point is 10°C or more lower than the melting point of the core layer (llb). As the material used for the layer (llb), the same polymer as in the case of the above-mentioned composite flat yarn can be exemplified.

Further, FIG. 4 shows a weaving process using the above-mentioned composite flat yarn (]) on one side of both warp and warp yarns and the above-mentioned composite monofilament yarn (11) on the other side, and then weaving this at the intersection point in the same temperature range as described above. (2) is thermally bonded, and the outer layer (1a) of the composite flat yarn (1) and the sheath layer (11, a) of the composite monofilament yarn are softened and bonded together.

Once done, only misalignment and unraveling occur.

In each of the above embodiments, the width and thickness of the composite flat yarn (1) and the thickness of the composite monofilament yarn (11) used for the warp and warp yarns, as well as the number of each yarn to be implanted, etc. can be arbitrarily set according to the purpose.

Furthermore, it is also possible to mix composite flat yarn (1) and composite monofilament yarn (11) in both warp and warp yarns.

The above-mentioned net]-like material (A) does not cause any misalignment or unraveling of the edges, can maintain a specified net state well, and can be easily heat-sealed, so these characteristics can be utilized. It can be suitably used in various fields such as agriculture, civil engineering and construction, daily necessities, and industrial materials.

For example, for agricultural purposes, it can be suitably used for various nets such as light-shielding nets, cheesecloth, windproof nets, sandproof nets, insect-proof nets, bird-proof nets, vegetable packing nets, etc., and can be easily heat-sealed. Leaf tobacco bags, tea bags, combine bags,
Can be used to insert rice husk bags, etc.

In the field of construction and civil engineering, it can be suitably used as a paint scattering prevention net, a construction net, an insect control net, a blinding net for a balcony, a base material for construction sheets, a curing mat, a drain material, and as a bag for sandbags.

Daily necessities and miscellaneous goods include draining bags, garbage bags, laundry bags,
It can be suitably used for vegetable storage bags, fashion bags, futon bags, and other bags, and the bags are easy to manufacture because they can be easily heat-sealed. It can also be used alone for golf nets, tablecloths, etc.

Further, as industrial materials, it is suitably used for various lining materials, packaging cloths, container bags, etc.

[Example I]

As the core layer (1b), Ml (melt index)
: Ig/10m1n, melting point 130℃ 1 softening point 12
High-density polyethylene at 6°C, also as the outer layer (1a), M I + 2 g710min, melting point 109°C,
Using low-density polyethylene with a softening point of 87°C,
A multilayer film was formed by extrusion using two types and three layers of T dies, and this multilayer film was slit to 4 mm l+, and further stretched to a stretching ratio of 7 times to obtain 350 d (denier), strength 4.5 g/d, and elongation 20. % composite flat yarn was obtained.

This composite flat yarn is used for each of the weft and warp yarns, and after weaving with the number of weaving yarns being 8 yarns/i-way channel x 8 yarns/1 nch, the intersection portion (2) of both the warp and weft yarns is heated by a heating machine at 110°C. They were thermally bonded to obtain a net-like material as shown in FIG.

Place this net-like material on the bottom (B1) and back center (B2).
) is heat-sealed to make a bag (340 mm) as shown in Figure 5.
x 280mm) was manufactured. When this bag (B) was used as a drainage bag for a sink drain, the bag did not shift or unravel at the edges, had good durability, and could be used for a long period of time.

[Example ■]

As core layer (llb), MI: 1 g710mi
n, high-density polyethylene with a melting point of 130°C and a softening point of 126°C, and as the sheath layer (ILa), M I: 2
g/10m1n, low density polyethylene with a melting point of 109°C and a softening point of 87°C was used, and stretched 7 times.
500d (denier), strength 3.3g/d, elongation 4
A 0% composite monofilament yarn was obtained.

This composite monofilament yarn is implanted in 28 pieces/
Woven with 1nch x 28 pieces/1nch, 110
The intersecting parts of both warp and weft yarns were thermally bonded in a heating machine at 0.degree. C. to obtain a net-like article as shown in FIG.

When this net-like material was used as a paint scattering prevention net, it had good air permeability, no misalignment, and sufficient strength, and good test results were obtained.

[Example ■]

The composite flat yarn obtained in Example 2 was made black by adding a pigment to the weft, and the composite monofilament yarn obtained in Example 2 was used as the warp to weave, and this was woven in a heating machine at 110°C. The crossing portions of both warp and weft threads were thermally bonded to obtain a net-like product as shown in Fig. 4.

Similar to the above case, this net-like material did not suffer from scratches or unraveling at the edges, and particularly good results were obtained when used as a light-shielding net.

[Effects of the Invention] As described above, in the net-like article of the present invention, both the weft and weft threads are integrally joined at their intersections, so even if the openings are quite large, the net-like article of the present invention cannot be woven. Coupled with this, there is no possibility of scratches, and there is no unraveling at the ends, particularly at the cut ends, so that a predetermined net condition can be maintained well. In particular, it can be bonded to the center layer or core of a composite flat yarn or composite monofilament yarn without much influence of thermal adhesion, and does not reduce the effect of stretching, thereby retaining sufficient strength and excellent durability.

Furthermore, since the outer layer or sheath layer appears on the surface of the net-like article, it is easy to heat-seal the net-like article when processing it into a bag, and the sealing portion can also maintain sufficient strength.

Therefore, the net-like material of the present invention is suitable for "double agricultural use,"
It can be widely and suitably used in various fields such as civil engineering and construction, daily necessities, and industrial materials.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a perspective view, FIG. 2 is a partially enlarged perspective view, FIGS. 3 and 4 are partially enlarged perspective views showing other embodiments, and FIG. 5 is a partially enlarged perspective view. 2 is a schematic perspective view showing an example of the case where the net-like material of FIG. 1 is used for a bag. FIG. (1)...composite flat yarn, (la)...outer layer,
(1b)...Central layer, (2)...Cross section, (11)...
... Composite monofilament yarn, (lla) ... sheath layer, (llb) ... core layer, (A) ... net-like material.

Claims (1)

[Scope of Claims] A composite flat yarn consisting of a one- or three-layer structure in which the polymer melting point or softening point of both the front and back outer layers is lower than the polymer melting point or softening point of the central core layer by 10°C or more. A net-like article characterized by being woven using both yarns and thermally bonding the intersections of both warp and weft yarns at a temperature higher than the softening point of the polymer of the outer layer. 2. Monofilament yarn with a two-layer structure of core and sheath.
Weaving a composite monofilament yarn in which the polymer melting point or softening point of the sheath layer is 10°C or more lower than the polymer melting point or softening point of the core layer, using both warp and warp yarns,
A net-like article characterized by being made by thermally bonding the intersections of both warp and weft yarns at a temperature higher than the softening point of the polymer of the sheath layer. 3. Weaving using the composite flat yarn according to claim 1 as one yarn of warp and warp yarns and the composite monofilament yarn according to claim 2 as the other yarn, and weaving the polymer in each outer layer or sheath layer of both yarns. A net-like product characterized by being made by thermally bonding the intersections of both warp and warp threads at a temperature above the softening point.