JPS6028547A - Insect-proof net - 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 The present invention relates to an insect screen. More specifically, it relates to an insect repellent net that prevents slippage.

[Insect nets made of monofilaments made of vinyl chloride, vinylidene chloride, polypropylene, etc. are widely used. However, insect repellent nets made of these monofilaments have the disadvantage that the intersections of the threads are slippery, the ends are easy to fray, and the meshes easily shift due to external impact, resulting in incomplete insect repellent effects. have Although tightly compressing the fabric structure is effective in improving the above-mentioned drawbacks, it is undesirable because it causes poor ventilation and poor visibility. In addition, resin processing carried out to prevent stitches on cheesecloth, etc. is effective in preventing stitches, but the resin is interposed between the fabric structures, which impairs ventilation and impairs the aesthetic appearance. This is an undesirable result.

As a result of intensive research into insect repellent nets that prevent slippage without impairing ventilation or aesthetics, the present inventors have found that they have been developed using only a composite monofilament consisting of multiple components with different melting points, or by combining the composite monofilament with other monofilaments. It was discovered that the object could be achieved by heat-treating a fabric using a combination of That is, the present invention provides fiber-forming property (1) (a first component consisting of a coalescence) and a second component consisting of one or more polymers having a melting point 20°C lower than that of the first component; 7 on the fiber surface
0 to 100φ and an average thickness of 16 to 72 microns, a fabric consisting of a single composite monofilament arranged in a parallel type or a sheath-core type, or a fabric made of composite monofilaments alone (4 pieces/inch) or more in both Korean and Korean styles. By interweaving the composite monofilament with other monofilaments to form a woven fabric, and heat-treating the composite monofilament at a temperature below the melting point of the first component and 1 degree above the melting point of the second component, the intersection of the composite monofilament becomes the second component. It is an insect repellent net that is fixed by heat fusion.

The present invention will be explained in more detail. In the present invention, the reason why the melting point difference between both components of the composite monofilament is set to 20°C or more is that if the melting point difference is less than 20°C, the temperature of the heat treatment performed to prevent the fabric from slipping will reach the melting point or softening point of the first component. This is undesirable because deformation such as heat shrinkage occurs in the composite monofilament during the heat treatment, causing wrinkles in the fabric.

The reason why the second component is arranged so as to occupy 70 to 100% of the fiber surface in the composite monofilament is that when the fiber surface occupancy of the second component is in the range of 30 to 70 inches, peeling between the composite components occurs when the composite monofilament is drawn. As a result, the single monofilament of the first component is separated into a single monofilament of the second component, and during heat treatment of the fabric, the single monofilament of the second component shrinks, breaks, or , the droplets form at the crossing points, and satisfactory heat fusion does not occur, resulting in insufficient effect of preventing the fabric from slipping. Furthermore, when the fiber surface occupancy of the second component is 30 or less, the first component with a high melting point occupies 70% or more of the fiber surface, and the thermal bonding force at the intersection of the fibers is weak.
The number of welded parts also decreases, and the effect of preventing misalignment becomes insufficient.

For composite monofilaments in which the 25th y, minute occupies more than 70 mm of the fiber surface, a known parallel type composite spinning device is used, and each component is spun so that the melt viscosity of the second component is lower than that of the first component. It can be obtained by selecting the 1TJj4 of the polymer and the spinning temperature and adjusting the viscosity difference between the two components (see Japanese Patent Publication No. 55-17807). Further, a composite monofilament in which the second component occupies 100 fibers on the fiber surface can be easily obtained by using a known sheath-core type composite spinning device and using the second component as the sheath component.

In the above composite monofilament, the reason why the average thickness of the second component is limited to a range of 16 to 72 microns is as follows. If the average thickness of the second component does not reach 16 microns, even if the composite monofilament is heat-treated, the surface area λ of the fused bond forming part will be small, and the fused bond will be easily cut by external force.
Therefore, the effect of preventing the l'' deviation is not sufficient. Furthermore, the second component is likely to peel off from the surface of the composite monofilament due to mechanical v5e and friction that the composite monofilament undergoes during the weaving preparation process and weaving process, and if peeling occurs, powder may fall during the process and cause trouble. This is undesirable as it may cause fuzz to form on the fabric.

If the average thickness of the second component exceeds 72 microns, the heat shrinkage force of the second component generated during heat treatment to prevent misalignment will be large, causing wrinkles in the fL weave proboscis, and may cause heat sensation. jj4 The fabric stuck to the rLA, and when it was picked up as it was, a part of the sticky second component was torn off.C heat treatment, it remained on the machine and gradually accumulated, and the deposited second component was It may cause problems such as spoiling the product and spoiling its appearance.

The average thickness of the second component is the same as the average thickness of the first component and the second component when spun using a known parallel type or sheath-core type composite spinning device.
The composite weight ratio of the components and the fineness (denier) of the demon filament (7J') can be easily calculated using the following equation.

Bound/I amount ratio Specific gravity Diameter (microns) 1st component Horse
ρI DI ρ=ρ+ x (B1/100) ten ρ! X (B
2 /100) (1) D2=141,47x (d/
ρ) (2) DI” ” 14L, 47 X d(B1
/100) /ρI(3)Dt = (D-DI)
/ 2 (') However, d is the fineness (denier) of the composite monofilament.The reason why the composite monofilament is arranged so that the warp and weft are each 4/inch or more when constructing the fabric is that the density of the composite monofilament is 4. This is because if the amount is less than 1/2, the number of fiber intersections that are firmly joined by heat fusion will be reduced, and the effect of preventing misalignment against impact will be insufficient.

When interweaving the above composite monofilament with other fibers,
As the other fibers, those commonly used for insect repellent nets can be used, but the only limiting condition is that they do not melt, deform, or deteriorate during the heat treatment described below.

In the present invention, a woven fabric consisting of a composite monofilament alone or a mixture of a composite monofilament and other fibers has a melting point of the first component (high melting point component) higher than the melting point of the second component (low melting point component) of the composite monofilament. By heat-treating at the following temperature, the intersections of the composite monofilaments are firmly bonded by heat fusion. As a method for this heat treatment, dryers such as a hot air dryer, suction dryer, and Yankee dryer, and heating rolls such as a calender roll and a hot roll can be used.

The present invention will be further explained using examples. The method for evaluating misalignment and the method for measuring the fiber surface occupancy of the second component used in the examples are shown below.

Evaluation of misalignment: An insect screen was stretched on a square frame of 951nX25 (Flg) and set horizontally, and a heavy 'kklKF brick was dropped from a height of 60 meters so that the corners were exposed to the insect screen 11i4, 5 times. Measure the number of times when a misalignment was clearly observed in the number of times the test was performed, and the cases where misalignment occurred in the 3rd test are ×, the cases where the misalignment occurred 1 or 2 times are △, and the cases where no misalignment occurred Indicated with ○.

Surface occupancy: A microscopic photograph of the cross section of the composite monofilament was taken, and the ratio (percentage) of the fiber periphery occupied by the second layer was measured, and the average value of 10 samples was shown.

Example 1 Crystalline polypropylene with a melting point of 161°C (MFR: 7.5”) was used as the first component, and the melting point was 128°C (MFR: 7.5”).
10, 16, 21, 25) as the second component, using a parallel type or sheath-core type spinneret with a pore diameter of 1.5 ttm, and a composite weight ratio of 50; 50.
After obtaining a composite undrawn monofilament of
) was obtained. Furthermore, for comparative examples and for mixed weaving,
Monofilament with a fineness of 500 denier made of polypropylene alone used as the first component (Test No. 1-6)
I got it.

The above monofilament (test number 1-6) and any of the above composite monofilaments (test numbers 1-1 to 1-5) were combined and woven, and the density of both warp and weft was 15 x 15 pieces/inch and 16 x 16 pieces/inch. A plain woven fabric was obtained. The number of composite monofilaments used in the fabric is 1
5 x 15 strands/inch fabric, 5 strands/inch (1 every 3 strands) or 3.75 strands (1 every 4 strands), 16
For a fabric of 16 strands/inch, it is 4 strands/inch (one strand for every 4 strands) or ii: 3.2 strands/inch (5 strands/inch). For comparison, a fabric made only of polypropylene monofilament (Test No. 1-6) was also obtained. Each of the obtained fabrics was heat-treated to make an insect repellent net by passing it in an S-shape between two heat rolls having a diameter of 300 mm and a temperature of 145° C. at a rate of Q Q m/min, and a misalignment test was performed.

The results of these tests are shown in Table 1.

In the composite monofilament of Test No. 1-1, in which the proportion of the second component occupying the fiber surface was less than 70 yen, peeling between the composite image components was noticeable, and the same peeling occurred in the insect repellent net using this in the mesh shift test. The effect of preventing wrinkle shift was small. Further, in Test Nos. 1-2 to 1-5, the effect of preventing misalignment was insufficient in fabrics in which the density of composite monofilaments was less than 4 filaments/inch, and the effect was significant when the density was 4 filaments/inch or more.

Example 2 The crystalline polypropylene used in Example 1 was used as the first component and placed on the stone side, and the melt index 21 used in Example 1 was
The second component is high-density polyethylene, which is placed on the sheath side.
Undrawn yarn was obtained by spinning at various composite ratios shown in the table, and stretched under the same stretching conditions as in Example 1 to obtain a fineness of 300 and 7.
Various composite monofilaments of 00 denier-y were obtained. Density 14X'1 consisting of these composite monofilaments alone
4 strands/inch and 18 x 18 strands/inch plain weave fabrics were fabricated in an upper calender roll of 135 degrees Celsius, a lower calender roll temperature of 130 degrees Celsius, and a nip pressure of 30 degrees Celsius. The sample was heat-treated by passing it between calender rolls of /41+ at a speed of 70 m/min.

The obtained insect repellent net was subjected to a mesh deviation test, and the results are shown in Table 2.

Table 2) 8 In the composite monofilament of Test No. 2-1, the second component peeled off during the warping process, which is a fabric preparation process, and powder build-up was noticeable on the yarn guide.

It also adhered to the hot roll during the heat treatment process for textiles. 0 melts were generated. Furthermore, the product insect repellent net KVi[
j No effect on preventing slippage was observed.

Although some powder generation was observed in the composite monofilament of Test No. 2-2 during the warping process, there was no problem with the warping, weaving, heat treatment, etc. processes, and the effect of preventing the insect mesh from slipping was also recognized to be effective. .

The composite monofilament of Test No. 2-3 had a sufficient effect of preventing the fabric from slipping, but it adhered to the hot roll during the heat treatment process, and over time, the fused material deposited on the hot roll became sticky on the fabric. The quality of the net as an insect control net has deteriorated. Furthermore, due to the heat treatment, shrinkage areas were generated in the composite monofilament, and wrinkles were generated in the product insect screen.

The composite monofilament of Test No. 2-4 showed a slight tendency to stick to the hot roll during the heat treatment process of the fabric, but there were no problems with the manufacturing process or the quality of the insect screen, and the effect of preventing slippage was sufficient. there were.

Example 3 Polyester (polyethylene terephthalate, melting point 258°C) with an intrinsic viscosity of 0.65 was used as the first component (core component),
Low melting point polyestethyl (polyethylene terephthalate copolymer, melting point 132°C) with an intrinsic viscosity of 0.62 was added to the second
component (sheath component), @ core type composite undrawn yarn with a composite weight ratio of 50:50 was obtained, and this was drawn using a wet heating drawing device.
A composite monofilament that has been stretched 6.0 times, has a fineness of 500 denier, and an average thickness of the second component of 33 microns? 4J
is.

This composite monofilament was made into a plain weave fabric with a density of 20 fibers/inch in both warp and warp, and was heat-treated under the same conditions as in Example 2 to form an insect repellent net. In this example, there were no problems in the manufacturing process, and the product insect repellent net had an excellent effect of preventing slippage (rating: ○).

that's all

Claims (1)

[Claims] (1) A first component consisting of a fiber-forming polymer and a second component consisting of one or more polymers having a melting point lower than that of the first component by 20°C or more, and the second component is A woven fabric consisting of a single composite monofilament arranged in parallel or sheath-core fashion, or a composite monofilament in both meridians (4 pieces/inch), occupying approximately 100 square meters of the fabric and having an average thickness of 16 to 72 microns. By forming a fabric by interweaving with other monofilaments as described above and heat-treating the composite monofilament at a temperature below the melting point of the first component and above the melting point of the second component, the intersection of the composite monofilaments can be An insect repellent net characterized in that the second component is fixed by heat fusion.