JPH09228187A - Manufacturing method for lightweight flame retardant curing mesh sheet - Google Patents

Abstract

(57) [Abstract] [Problem] Light weight, flame retardant and flexible, misalignment,
Provided is a method for producing a curable mesh sheet that is excellent in durability without bending. SOLUTION: A mixed filament yarn of a fiber (A) made of a thermoplastic resin as a matrix and a synthetic fiber (B) as a reinforcing yarn having a higher heat fusion temperature than the fiber is used as a warp yarn of a mesh sheet or And / or weft, after weaving, heat treatment at a temperature higher than the melting point of the A fiber and lower than the melting point of the B fiber to melt the A fiber and coat the B fiber with the melt, thereby fixing the texture structure together. And a method for producing a lightweight flame retardant curing mesh sheet.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a curing mesh sheet for construction. More specifically, the present invention relates to a method for producing a curing mesh sheet that is lightweight, flame-retardant, flexible, and has excellent durability without misalignment or bending.

[0002]

2. Description of the Related Art Conventionally, a curing mesh sheet for civil engineering and construction is made by weaving polyester fiber having flame retardancy, and a coarse base cloth made of synthetic fiber typified by polyester is impregnated with flame retardant thermoplastic resin. Things are known.

Curing mesh sheet using flame-retardant polyester fiber has advantages that it is lightweight, rich in flexibility and easy to handle, and that harmful gas is not generated during incineration, but the fiber is directly irradiated with ultraviolet rays. Therefore, the curing mesh sheet has poor weather resistance, which is a strict requirement, and fine dust gets inside the fiber to scratch the fiber, resulting in poor strength and poor durability. It also has many drawbacks such as difficulty in falling and easy misalignment. Therefore, generally, a curing mesh coated with a thermoplastic resin is widely used.

A vinyl chloride resin is most commonly used as a coating resin for imparting flame retardancy. It has excellent flameproofness, excellent workability, and various processing methods. Can be adopted, and it is easy to color.

A vinyl chloride resin-coated curing mesh is woven from polyester fibers and then impregnated with a vinyl chloride paste (for example, Japanese Patent Laid-Open No. 12567/1993).
No. 1) and a polyester fiber as a core yarn, coated with vinyl chloride resin, and then woven (for example, Japanese Patent Laid-Open No. 4-
370278). The former has the advantages that the woven structure is firmly fixed and there is no misalignment, so that it does not spoil the aesthetics even after long-term use and has improved durability, but on the other hand, it is excessive when impregnated with vinyl chloride resin. When the resin adheres to clog the eyes and is stretched vertically, it has a drawback that it is easily affected by wind pressure due to wind and is damaged or split. Also, the weight of the seat increases,
Since it lacks flexibility, workability is significantly reduced.

The latter is capable of adhering a proper amount of resin and is excellent in lightness and foldability, but since the woven fabric structure is not fixed, misalignment and bending are likely to occur and the aesthetic appearance is deteriorated and the quality is poor. However, since the strength of the knot is low, the durability is inferior. Also, in the process of dipping the polyester yarn with vinyl chloride resin, it is necessary to pass the polyester multifilament through very small pores (nozzles), so if there is fluff or single yarn breakage in the filament, it will be caught in the nozzle It has the drawback of reaching the end.

As described above, in the vinyl chloride resin-covered curing mesh, a method that is satisfactory in all aspects such as lightness, flexibility, prevention of misalignment and bending, durability, and workability has not been found yet. It is the actual situation.

[0008]

The present invention, while maintaining the general properties of a curing mesh, does not cause misalignment, is flexible and easy to handle, has excellent durability, and has a good workability. It is intended to provide a method for manufacturing a mesh sheet.

[0009]

The inventor of the present invention has arrived at the present invention as a result of extensive studies to solve the above problems.
That is, the present invention provides a warp yarn of a mesh sheet, which is a mixed fiber yarn of a fiber (A) made of a thermoplastic resin as a matrix and a synthetic fiber (B) as a reinforcing yarn having a higher heat fusion temperature than the fiber. Alternatively, by using it as a weft and then weaving it and then heat-treating it at a temperature higher than the melting point of the A fiber and lower than the melting point of the B fiber to melt the A fiber and coat the B fiber with the melt, the texture structure is fixed together. A method for producing a lightweight flame retardant curing mesh sheet, which is characterized by the above.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The lightweight flame retardant curing mesh sheet of the present invention comprises a fiber (A) made of a thermoplastic resin as a matrix and a synthetic fiber (B) as a reinforcing yarn having a higher heat fusion temperature than the fiber. ) With mixed yarn.

The thermoplastic resin of the present invention has a melting point of 12
0 to 210 ° C and a melting point difference with synthetic fibers of 50 to 13
The melting point is preferably in the range of 0 ° C. If the range is less than 50 ° C., not only the resin but also the synthetic fibers may be melted when the mesh-shaped sheet is heat-treated. On the contrary, when the melting point difference exceeds 130 ° C., for example, when the melting point of the synthetic fiber is low, there is a problem in practical use as a mesh sheet.

In the present invention, the thermoplastic resin may be any resin for coating which is usually used for resin-coating a mesh sheet, and may be a polyurethane resin, a halogen-containing vinyl resin, or an ethylene-vinyl acetate copolymer system. Examples of the resin include halogen-containing vinyl resins, and vinyl chloride-based resins are particularly preferable in terms of processability.

In the present invention, the synthetic fiber is not particularly limited as long as it can form a fiber yarn.
Examples thereof include polyester fibers, polyamide fibers, aromatic polyamide fibers, polyvinyl alcohol fibers, polyacrylonitrile fibers, and the like. Among them, polyester fibers are preferable from the viewpoint of melting point and low water absorption. The polyester fiber is composed of ethylene terephthalate in an amount of 80 mol% or more of its repeating unit, and it is possible to copolymerize a conventionally known acid component, glycol, and other third component within a range not impairing the object of the present invention. No problem. In particular, a polyester obtained by copolymerizing a bifunctional phosphorus compound can obtain a curing mesh sheet having higher flame retardancy and is more preferably used.

The polyester fiber preferably has an intrinsic viscosity of 0.8 or more, a strength of 7.0 g / de or more, and a breaking elongation of 20% or more. Further, the strength is preferably 8.0 g / de or more and the cutting elongation is 25% or more.

If the intrinsic viscosity is less than 0.8, the strength and durability of the curing mesh sheet will be poor, and the strength will be 7.0 g.
If it is less than / de and the cutting elongation is less than 20%, only a cured mesh sheet having insufficient toughness can be obtained.

The mixed fiber used in the present invention can be obtained by combining both yarns of a synthetic fiber and a fiber made of a resin and subjecting the combined yarn to a fluid disturbing treatment.

In the present invention, the mixing ratio of the fibers of the resin of the mixed fiber may be arbitrarily changed according to the design of the curing mesh sheet performance, but when the density of the sheet is high, the mixing ratio is small. On the contrary, in the case of a woven fabric design in which the density is small and the fabric is coarse, it is preferable to increase the mixed fiber ratio in order to fill the voids of the synthetic fibers that finally constitute the woven fabric. For example, synthetic fibers are polyester fibers,
When the resin is vinyl chloride, the blending ratio of polyester fiber and vinyl chloride fiber is 1: 1 to 1: 5 in denier ratio.
The fiber is mixed in the range of 1: 2, more preferably 1: 2.
The fibers are mixed in the range of 1: 3. When the ratio of vinyl chloride fiber is less than that of polyester fiber, the resin amount sufficient to coat the polyester fiber cannot be obtained and the flame retardancy and weather resistance are inferior. Is insufficient.

When the ratio of vinyl chloride fibers exceeds 5 times, vinyl chloride resin adheres more than necessary, and the weight of the curing mesh sheet becomes large, which deteriorates handleability.

In the present invention, it is preferable to twist the mixed fiber of the synthetic fiber and the fiber made of a thermoplastic resin in order to obtain a predetermined strength. The twisting condition is
The required tear strength design varies depending on the use of the curing mesh sheet, but it is usually in the range of 50 to 150 T / m.

In the present invention, a shuttle loom or a rapier loom generally used for weaving a woven fabric for industrial materials is used for weaving the twisted mixed yarn as a warp or / and a weft of a mesh sheet. Etc. may be used.

In the present invention, the mesh-like sheet obtained as described above is heat-treated at a temperature not lower than the melting point of the fiber made of the thermoplastic resin and lower than the melting point of the synthetic fiber. For example, when the resin is vinyl chloride and the synthetic fiber is polyester fiber, heat treatment is performed at a temperature not lower than the melting point of vinyl chloride and not higher than the melting point of polyethylene terephthalate to melt only the vinyl chloride component. By this treatment, the melted vinyl chloride resin fixes the woven fabric structure, so that it is possible to obtain a mesh sheet excellent in durability that is not easily misaligned or bent.

According to this method, an appropriate amount of resin can be accurately attached to the polyester fiber, and the weight of the mesh sheet can be suppressed to the necessary minimum.
Further, since the polyester fibers are fixed in a state of being uniformly dispersed in the vinyl chloride resin, the flexibility of the mesh sheet is increased and the workability can be improved. Moreover, since there is no vinyl chloride resin dipping step, the processability is not affected even if the polyester filament is fluffed or broken.

When carrying out the heat treatment of the present invention, it is preferable to use a tenter or the like capable of gripping both ears of the mesh and controlling the tension of the sheet during the heat treatment with a feed roller and a drawing roll. The temperature needs to be higher than or equal to the melting point of the fiber made of the resin mixed as described above and lower than the melting point of the synthetic fiber, and may be appropriately set depending on the thermal characteristics of both.

[0024]

The curing mesh sheet of the present invention is lightweight,
It is flame-retardant and flexible, has no misalignment or bending, has excellent durability and good workability, and is useful as a curing mesh sheet for civil engineering and construction.

[0025]

The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these descriptions. The performance evaluation of the mesh sheet in the examples was based on the following method. (1) Unit weight (g / m ² ): Measured according to JIS L-1096. (2) Tensile strength (kg / cm ² ): JIS L-109
6 was measured. (3) Elongation (%): Measured according to JIS L-1096. (4) Flameproof property: Measured according to JIS-A-8952. (5) Misalignment: Weight of 2 kg at grid points of mesh fabric
The weight was suspended, and it was visually confirmed whether misalignment occurred. Evaluation ○: No misalignment occurred ×: Misalignment occurred

[Example 1] A polyester multifilament yarn 1500d / 250f having an intrinsic viscosity of 0.90 and a vinyl chloride multifilament yarn 600d / 120f were mixed to have a denier ratio of 1: 2. Weaving with a rapier loom so that the warp has a density of 30 threads / 10 cm and the weft has a density of 30 threads / 10 cm.
A base cloth for curing mesh was obtained.

Next, the base fabric was heat-treated in an atmosphere of 150 ° C. for 1 minute at a constant length and heat-fixed to obtain a lightweight mesh sheet in which misalignment and fraying were unlikely to occur.

Comparative Example 1 Polyester multifilament yarn 1500d / 250f was twisted at 100 T / m and used as warp and weft to obtain a base fabric having a basis weight of 108 g / m ² . Next, the base cloth was coated on both sides with a vinyl chloride paste to obtain a curing mesh, which was used as Comparative Example 1.

Comparative Example 2 Polyester multifilament yarn 1500d / 250f was dipped with a vinyl chloride paste, and the resulting dip cord was woven using warp and weft to obtain a curing mesh, which was used as Comparative Example 2.

Table 1 shows the characteristic evaluation results of the mesh sheets of Example 1 and Comparative Examples 1 and 2. As is clear from Table 1, the curing mesh sheet of Example 1 of the present invention was
In addition to having no bending and satisfying the characteristics required as a curing mesh sheet, it had less basis weight than Comparative Examples 1 and 2 and was excellent in workability.

The mesh sheet of Comparative Example 2 has a relatively low basis weight and satisfies the characteristics as a curing mesh.
Misalignment and bending were likely to occur.

[0032]

[Table 1]

Claims (8)

[Claims] 1. A warp yarn of a mesh sheet, comprising a mixed yarn of a fiber (A) made of a thermoplastic resin as a matrix and a synthetic fiber (B) as a reinforcing yarn having a higher heat fusion temperature than the fiber. Alternatively, by using it as a weft and then weaving it and then heat-treating it at a temperature higher than the melting point of the A fiber and lower than the melting point of the B fiber to melt the A fiber and coat the B fiber with the melt, the texture structure is fixed together. A method for producing a lightweight flame-retardant curing mesh sheet, which is characterized in that 2. The melting point difference between the thermoplastic resin and the synthetic fiber is 5
The method for producing a lightweight flame retardant curing mesh sheet according to claim 1, which is 0 to 130 ° C. 3. The melting point of the thermoplastic resin is 120 to 210 ° C.
The method for producing a lightweight flame retardant curing mesh sheet according to claim 1 or 2. 4. The production of a lightweight flame retardant curing mesh sheet according to claim 1, 2 or 3, wherein the mixing ratio of the synthetic fiber and the fiber made of a thermoplastic resin is 1: 1 to 1: 5 in denier ratio. Method. 5. The synthetic fiber is a polyester fiber,
The manufacturing method of the lightweight flame-retardant curing mesh sheet according to claim 1. 6. The intrinsic viscosity of the polyester fiber is 0.8.
As described above, the method for producing a lightweight flame retardant curing mesh sheet according to claim 5, wherein the strength is 7.0 g / de or more and the cutting elongation is 20% or more. 7. The method for producing a lightweight flame-retardant curing mesh sheet according to claim 1, wherein the thermoplastic resin is vinyl chloride. 8. The thermoplastic resin is vinylidene chloride,
A method for manufacturing the lightweight flame-retardant curing mesh sheet according to claim 1.