JPH09275881A - Insect screening and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an insect screening formed of polypropylene hollow monofilament which is nonpoisonous itself and superior in environmental protection, lightweight and large in area per unit weight to obtain advantages of economy, and free of wrinkling and hard to have mesh disorderliness, and enables excellent fixture to a sash door. SOLUTION: This insect screening is formed by weaving polypropylene-based hollow monofilament. Further, this monofilament is preferably <=20g/10min in melt flow rate, <=30% in flatness rate Fr, 0.2 to 0.80 in the ratio d/D of the hollow diameter (d) to the diameter, <=3.0 in the ratio L/l between the thickness (l) of the thinnest part and the thickness L of the thickest part, and 9.8 to 17.0 in bending hardness index Bhi.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is not toxic due to materials, is excellent in environmental protection, is economical because it is lightweight and has a large area per unit weight, and it is less likely to cause wrinkles and is less likely to shift the mesh. The present invention relates to an insect repellent net having excellent sash attachment properties and a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, the performance required for insect screen fibers is that when processed into insect screen, wrinkles are less likely to occur, the mesh does not shift, and it is attached when it is fixed by inserting it into the groove of the sash frame with a rubber cord. It is excellent in workability and the like, and since it substantially satisfies these required performances, a flexible polyvinyl chloride (hereinafter abbreviated as PVC) monofilament has been mainly used in the past.

However, the insect net made of PVC monofilament is economically inferior because it has a high specific gravity due to its material properties and a large area cannot be obtained per unit weight.
Since it has low strength and is easily broken, and has a very high heat shrinkage rate, it has drawbacks such that mesh abnormality easily occurs due to mesh shrinkage. Furthermore, PVC is a compound containing chlorine, and due to the recent increasing awareness of environmental protection against the toxicity of combustion products generated in the case of incineration, etc., scraps generated in the process of manufacturing insect nets and insect nets after use It has been pointed out that it is difficult to dispose of, and for this reason, various applications of other materials in place of PVC have been studied.

Among the above researches on other materials, the materials are extremely light and economically advantageous as compared with other materials, and have excellent chemical and physical properties, and are used for clothing, interior applications, papermaking tools, filters and other industries. Attention has been paid to the application of polypropylene (hereinafter abbreviated as PP), which is widely used for material applications, to insect repellent nets.

However, the insect net made of PP monofilament is difficult to weave due to the rigidity of the material,
It had drawbacks such as easy fibrillation and difficulty in mounting the insect screen on the sash frame.

[0006] Therefore, for the purpose of softening the PP monofilament for insect repellent nets, addition of a plasticizer and low crystallization by low-magnification low-temperature heat setting at the time of production of the PP monofilament have been conventionally studied, but nevertheless. The bending hardness index Bhi described below is only about 18.0 or more at best, and the sash attachment property is poor when it is used as an insect repellent net. In addition, the net is apt to be wrinkled, the mesh is easily displaced, and the woven surface of the insect repellent net. The fact is that we have not been able to improve the drawback of poor quality. .

Therefore, as a method of further improving these drawbacks, a method of making a monofilament into a hollow fiber has been studied, for example, JP-A-54-120735, JP-A-54-138623, and JP-A-54-138623. 54-3
Japanese Patent No. 4418 and Japanese Patent Application Laid-Open No. 54-68414 propose a method for producing a porous PP hollow fiber.

However, when the polypropylene-based hollow fibers obtained by these methods are applied to an insect repellent net, the flexibility which is important as a monofilament for insect repellent net is improved, but the monofilament is more likely to be fibrillated because of its porosity. However, there is a problem in that the surface quality of the insect screen is impaired and it is not practical.

[0009]

As described above, when the PP-based monofilament is used as an insect repellent net, it is extremely useful as a raw yarn for producing an insect repellent net without the environmental problems of PVC monofilament. On the other hand, there were problems in terms of weavability, sash attachment, and surface quality.

In order to solve these problems and obtain flexibility, sufficient softness can be obtained even by adding a plasticizer and lowering crystallization by low-magnification low-temperature heat setting during the production of PP monofilaments. When not applied, and when the hollow fiber is applied to an insect repellent net, there is a problem such as deterioration of the surface quality due to fibrillation due to the porosity.
There was a problem that neither was sufficient to apply to insect repellent nets.

The present invention has been achieved as a result of studying how to solve the above-mentioned problems in the prior art.

Therefore, an object of the present invention is that the material is not toxic and is excellent in environmental protection, and it is economically advantageous because it is lighter in weight and has a large area per unit weight, and it is less wrinkled and the mesh is displaced. An object of the present invention is to provide an insect repellent net made of PP hollow monofilament which is difficult and has an excellent sash attachment property, and a method for efficiently producing an insect repellent net.

[0013]

In order to achieve the above object, the present inventor evaluated various characteristics of a PP monofilament hollow fiber system, and as a result, formed a hollow portion having a circular cross section in the center of the fiber. The present inventors have found that the PP-based hollow monofilament having the simplest shape has the necessary properties as an insect repellent net, and has reached the present invention.

That is, in the insect screen of the present invention, the fibers constituting the insect screen form a hollow portion having a circular cross section at the center.
It is characterized by being a P-based hollow monofilament.

Further, the insect net of the present invention has a PP hollow monofilament having a melt flow rate of 20 g / 10 m.
In, the bending hardness index Bhi defined in the text is 9.
8 to 17.0, flatness ratio Fr defined in the text is 3
0% or less, the ratio of the hollow diameter d to the diameter D, d / D (hereinafter abbreviated as hollow diameter ratio dr) is 0.20 or more and 0.80 or less, and the thickest portion (1) and the thickest portion Ratio of thickness L of L / ■ (hereinafter abbreviated as hollow eccentricity L / ■)
Is preferably 3.0 or less.

The PP type hollow monofilament constituting the insect repellent net of the present invention contains 85% by weight of propylene unit.
Consists of PP or propylene copolymer contained above, or P containing 85% by weight or more of propylene unit
The above properties can be obtained by comprising 50% by weight or more of P or propylene copolymer and a mixture of 50% by weight or less of thermoplastic elastomer having JIS-A hardness of 60 or more excluding vinyl chloride elastomer and fluorine elastomer. It is more preferable because it is easily handled.

Further, in the insect net of the present invention, the diameter of the PP hollow monofilament constituting the insect net is 0.05 mm.
To 0.50 mm, tensile strength is 35 m
N / d or more and 100 mN / d or less and 100 ° C. dry heat shrinkage of 15% or less are more preferable from the viewpoint of weavability and practicality of the insect screen.

In addition, the insect screen of the present invention having the above-mentioned properties is obtained by melt-extruding a PP-based polymer through a hollow nozzle.
8 seconds after introducing into a coagulation bath at 40 ° C or less and quenching within 0 seconds
A PP-based hollow monofilament is produced by stretching at a temperature of 0 ° C or more and 160 ° C or less at 5.0 times or more and 10 times or less, and then the PP type hollow monofilament is woven and efficiently set by heat setting. can do.

The flatness Fr in the present invention is a numerical value obtained by the following equation (1). Fr = (Lφ− ■ φ) × 100 / φ ... (1) where Lφ is the major axis of the hollow monofilament, and ■ φ is the minor axis. Further, φ is the average diameter of the hollow monofilament obtained from the arithmetic mean of the major axis and the minor axis.

The flexural hardness index Bhi referred to in the present invention is a numerical value obtained by the following formula (2), and in the formula, Bh
Is the bending hardness of the hollow fiber, specifically, as shown in FIG. 1, two pins (steel wire of 2 mmφ each) placed at intervals of 1 cm.
The center of the sample handed over to the J-shaped hook (1 mmφ
It is the maximum bending force (unit: mN) when the sample is bent by pulling it up with the steel wire. Further, φ in the formula (2) is the average diameter of the hollow monofilament (m
m).

[0021]

[Equation 1]

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below.

The PP polymer used for the PP hollow monofilament constituting the insect repellent net of the present invention is not particularly limited, and not only a homopolymer of propylene but also a comonomer copolymerizable with propylene, such as ethylene,
Examples thereof include those obtained by copolymerizing α-olefins, diolefins, vinyl monomers and the like by a usual polymerization method.

The melt flow rate of the PP hollow monofilament constituting the insect screen of the present invention is usually 20 g / 10.
It may be min or less, but it is particularly preferably 13 g / 10 min or less in terms of excellent fibrillation resistance. From the viewpoint of resistance to fibrillation, the lower the melt flow rate is, the more preferable it is, but if it is less than 1 g / 10 min, spinning becomes difficult, which is not preferable.

Here, the melt flow rate as referred to in the present invention is the one tested by JIS K 7210,
The test conditions are the condition 14 of Table 1 of JIS K 7210.

P composed of a mixture with an elastomer
The melt flow rate of the P-based hollow monofilament was also tested by the above JIS K7210.

The elastomer which is another polymer component used in the present invention is a thermoplastic elastomer having JIS-A hardness of 60 or more excluding vinyl chloride type elastomer and fluorine type elastomer. Specific examples of these thermoplastic elastomers include polyester-based, polyamide-based, polyolefin-based, polystyrene-based, polyurethane-based and 1,2-polybutadiene-based elastomers.

The polymers constituting the PP hollow monofilaments include various inorganic particles such as titanium oxide, silicon oxide, calcium carbonate, silicon nitride, clay, talc, kaolin, zirconium acid, etc., crosslinked polymer particles and various metals. In addition to particles such as particles, conventionally known antioxidants,
Addition of sequestering agents, ion exchangers, anti-coloring agents, light stabilizers, flame retardants, various coloring agents, antistatic agents, waxes, silicone oils, various surfactants, various reinforcing fibers, and various plasticizers. May be done.

The PP hollow monofilament constituting the insect screen of the present invention is a hollow monofilament having a hollow portion with a circular cross section formed at the center. Furthermore, the flatness ratio Fr is 30.
%, The hollow diameter ratio dr is 0.20 or more and 0.80 or less, and the hollow eccentricity L / ■ is 3.0 or less. More preferably, the flatness Fr is 15% or less and the hollow diameter ratio dr is 0.
Those having a hollow eccentricity L / ■ of 2.0 or less and 38 or more and 0.60 or less are preferably used.

When the flatness ratio Fr exceeds 30%, it is difficult to obtain an insect screen having a well-woven surface when it is woven into an insect screen, and only an insect screen with poor quality tends to be obtained. Further, when the hollow diameter ratio dr is less than 0.20, mesh misalignment is likely to occur when the fabric is woven into an insect repellent net as in the case of the PP solid monofilament, and the flexural hardness index Bhi becomes high, so that the insect repellent net The workability of mounting the sash frame tends to deteriorate. Therefore, the larger the hollow diameter ratio dr, the better. However, if the hollow diameter ratio dr exceeds 0.80, it tends to be difficult to obtain the circularity of the PP hollow monofilament even by the spinning method of the present invention described later, In addition, because the thickness is thin, thread knitting tends to occur when weaving into an insect repellent net, or even if it does not break, thread crushing easily occurs, and wrinkles easily occur, and an excellent insect repellent net with a woven surface is obtained. It tends to be difficult.

On the other hand, when the hollow eccentricity L / ■ of the PP type hollow monofilament exceeds 3.0, the difference in hardness in the direction perpendicular to the fiber axis is apt to be wrinkled due to the thick or thin wall thickness. In addition, the thin portion is likely to be broken and fibrillized, and it tends to be difficult to obtain a high-quality insect screen.

Further, the PP type hollow monofilament constituting the insect repellent net of the present invention has a bending hardness index Bhi of 9.8 or more and 17.0 or less, preferably 13.5 or more 1.
Those in the range of 6.0 or less are preferably used.

When the bending hardness index Bhi exceeds 17.0, the insect net woven from this hollow monofilament is difficult to be fitted when it is fixedly attached by being fitted into the groove of the sash frame with a rubber cord, and the sash frame of the insect net is not. There is a tendency that the work efficiency of attachment to the will be impaired. Furthermore, even if the hollow diameter ratio dr is in the range of the above numerical values, thread cracks, wrinkles, and
Misalignment tends to occur. This unfavorable tendency is considered to be due to the rigidity of the PP-based monofilament. Therefore, the lower the bending hardness index Bhi, the better. However, if the bending hardness index Bhi is less than 9.8, not only is the hollow monofilament too soft to obtain a stable insect repellent net, but also to the sash frame. The fixing force for fitting is weak and the insect net tends to fall out of the sash frame.

The insect repellent net of the present invention obtained by weaving PP hollow monofilaments sufficiently has the characteristics required for the insect repellent net. However, in the hollow monofilament made of PP alone, the bending hardness index Bhi is only about 16.0 or more by the method of the present invention due to the rigidity of the material. Therefore, the PP-based hollow monofilament that constitutes a more preferable insect repellent net is composed of a mixture of PP-based and thermoplastic polymers that are more flexible than PP-based.

A hollow monofilament made of a mixture of a PP polymer which constitutes the insect repellent net of the present invention and a thermoplastic polymer which is softer than the PP polymer is a PP polymer 50.
It is a mixture of more than 50% by weight and less than 50% by weight of elastomer.

When the mixing ratio of the elastomer exceeds the above range, the flexural hardness index Bhi becomes lower than 9.8, and it tends to be difficult to obtain a stable insect repellent net, and the elastomer is fitted into the sash frame. The fixing force is weak and the insect screen may tend to fall out of the sash frame.

The PP-based hollow monofilament is PP
When it is composed of a mixture of a polymer and an elastomer, P
The bending hardness index Bhi of the P-based hollow monofilament was set to 9.
It can be in the range of 8 or more and 16.5 or less.

The diameter of the PP hollow monofilament constituting the insect net of the present invention is 0.05 mm to 0.50 m.
m, preferably 0.15 mm to 0.35 mm. If the diameter of the PP hollow monofilament is less than 0.05 mm, even if the hollow diameter ratio dr is within the range of the above numerical value, the absolute thickness of the hollow monofilament is thin and the hollow monofilament tends to be crushed even with an extremely small force. Not only is it difficult to obtain a regular woven surface when using a net, but the absolute strength is low, and the net tends to break with a very small impact.

On the other hand, when the diameter of the PP hollow monofilament exceeds 0.50 mm, not only is the amount of hollow monofilament used per unit area increased, which is economically disadvantageous, but it also becomes difficult to weave a high mesh insect screen. Further, even when the hollow diameter ratio dr and the bending hardness index Bhi are within the ranges of the above numerical values, when the insect repellent net is used, the sash frame mounting property of the insect repellent net tends to be impaired. It is considered that this is because the absolute bending hardness of the hollow monofilament becomes harder as the diameter of the monofilament increases.

In the method for producing the PP hollow monofilament having the above-mentioned characteristics, the cross-section of the unstretched yarn that has been cooled and solidified during melt spinning is observed and measured with a magnifying glass with a gauge, and the hollow diameter ratio dr is The amount of blown hollow air was adjusted so as to fall within the range of the present invention, and the amount of discharge was adjusted by a conventional method to obtain a desired yarn thickness.
The outline of the method of stretching in stages is described below. The optimum conditions of the cooling method and the stretching method will be described below.

First, the PP polymer of the present invention or the mixture of the PP polymer and the elastomer mixed in advance is melt extruded from the hollow nozzle by a conventional method. This extruded hollow filament melt has a temperature of 40 ° C. or lower within 2.0 seconds after extrusion,
Preferably, it is introduced into a coagulation bath at 25 ° C. or less and rapidly cooled within 1.5 seconds.

If the hollow filament melt is not introduced into the coagulation bath within 2.0 seconds after extrusion, the hollow eccentricity L / ■ tends to be large even if the coagulation bath temperature is within the above range, and it is arranged. It tends to be difficult to obtain a hollow fiber shape. Further, if the coagulation bath temperature exceeds 40 ° C., the hollow filaments are crushed and the roundness is impaired, and it becomes difficult to obtain the hollow shape intended by the present invention, which is not preferable.

Although the reason for this is not clear, it is considered that if the hollow filament melt is slowly cooled by air until it enters the coagulation bath, cooling spots are generated during the slow cooling and the hollow shape collapses. . When the coagulation bath temperature exceeds 40 ° C., it is considered that the hollow filament becomes too flexible and is easily deformed due to the contact resistance with the guide in the coagulation bath, impairing the roundness.

Therefore, the lower the cooling temperature, the better, but from the viewpoint of practicality, the range of 15 ° C to 25 ° C is preferable.

The preferred cooling time in this cooling method is to allow the hollow filament to pass through the coagulation bath immediately after the nozzle for 2.0 seconds to 30 seconds, although it depends on the thickness of the hollow monofilament.

The cooling medium for the coagulation bath used here is a substance which can be easily removed again from the surface of the hollow filamentous substance and which does not physically or chemically change the polymer. There is no particular limitation as long as the substance is liquid in the coagulation bath temperature range described above, but practical examples thereof include water, paraffin, ethylene glycol, glycerin, amyl alcohol, and xylene.

The hollow undrawn yarn thus obtained is
Subsequently, it is stretched so as to obtain appropriate flexibility for insect screens. This stretching can be performed in either single-stage or multi-stage stretching, but it is desirable to adopt the single-stage stretching because of the simplicity of the apparatus.

The stretching is carried out under conditions of relatively high temperature and high magnification, that is, 80 ° C to 160 ° C, particularly 130 ° C to 140 ° C.
The stretching is carried out at the following temperature in the range of 5.0 times or more and 10.0 times or less, and particularly 6.5 times or more and 8.0 times or less.
If the drawing temperature is less than 80 ° C., the fibers are easily broken during drawing, and further, a rigid PP-based hollow monofilament tends to be formed, which is not preferable. On the other hand, if it exceeds 160 ° C., the stretching tension is remarkably lowered and the stretching becomes difficult, which is not preferable.

On the other hand, if the draw ratio is less than 5.0 times, it is not preferable since not only uniform PP type hollow monofilaments are not produced due to draw unevenness, but also polyester hollow monofilaments having sufficient strength cannot be obtained. . On the other hand, if it exceeds 10.0 times, yarn breakage easily occurs, devitrification occurs, and it becomes a rigid PP hollow monofilament, yarn breakage easily occurs, and it tends to be difficult to obtain a regular woven surface when used as an insect repellent net. Is not preferable.

The PP type hollow monofilament stretched as described above can be heat-treated in order to further improve the dimensional stability, but it is a harsh substance that impairs the preferable properties as the above-mentioned PP type hollow monofilament for insect repellent nets. Heat treatment should be avoided.

Here, the heat medium suitable for the above-mentioned drawing and heat treatment is a substance which can be easily removed again from the surface of the hollow monofilament and which does not physically or chemically change the hollow monofilament. Anything will do as long as it is. As the heating device, for example, a liquid bath containing an inert liquid having a high boiling point, an air furnace, an inert gas furnace, an infrared furnace, a high frequency furnace, a metal furnace, or the like can be used.

The physical properties of the PP hollow monofilament constituting the insect repellent net of the present invention thus obtained are as follows: tensile strength is 35 mN / d or more and 100 mN / d or less,
Further, it is desirable that the dry heat shrinkage rate at 100 ° C. is 15% or less. Furthermore, the tensile strength is 55 mN / d to 80 mN /
d, and the dry heat shrinkage rate at 100 ° C. is more preferably 10% or less.

When the tensile strength of the PP type hollow monofilament is less than 35 mN / d, it is not practical because not only is the yarn broken during weaving of the insect repellent net, the weaving efficiency is impaired, but the insect repellent net is easily broken. When the tensile strength of the PP hollow monofilament exceeds 100 mN / d, the reason is not clear, but thread breakage easily occurs, which not only hinders the process of producing the insect repellent net, but also gives only poor insect repellent net. It is not preferable because there is no tendency.

If the dry heat shrinkage percentage at 100 ° C. exceeds 15%, the mesh of the insect repellent net tends to become irregular due to the net shrinkage during weaving, which is not preferable.

The PP type hollow monofilament obtained by the above method is then woven into an insect screen by a conventional method.
Various looms such as a slewing loom and a rapier loom can be used for weaving, but the slewing loom is preferably applied from the viewpoint of weaving efficiency and is woven into various meshes such as 16 mesh, 18 mesh and 20 mesh depending on the use. .

The woven insect screen is subsequently heat set by a conventional method. The heat setting may be performed by any method such as a roll set in which a roll heated with a heat medium is brought into close contact, a wet heat set, a dry heat set, a far infrared dry heat set, but the set magnification is preferably 1 time or more and 1.2 times or less. In addition, it is preferable to set the temperature at a temperature equal to or higher than the heat history temperature of the spinning process of the PP-based hollow monofilament, from the effect of setting the insect screen obtained.

The insect repellent net of the present invention thus obtained is not only economically advantageous because the material is not toxic, is excellent in environmental protection, is lightweight, and has a large area per unit weight.
It has a low bending hardness and therefore has excellent sash installation properties. Also, since the mesh is not easily displaced due to the appropriate crushability and the appropriate bending hardness, and the occurrence of wrinkles is small, the characteristics required as an insect repellent net are balanced. It is equipped with. Therefore, according to the present invention, in combination with various excellent properties such as toughness, elastic modulus, chemical resistance and flexibility of the PP system, it can be suitably applied as an insect repellent net, and the value of the present invention Can be said to be extremely large.

[0058]

EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited to the following examples unless it exceeds the gist.

The measurement and evaluation of each characteristic in the examples described below were performed according to the following criteria.

(1) Hollow diameter ratio dr, hollow eccentricity L / ■,
Flatness Fr and yarn diameter The yarn diameter, the hollow diameter, etc. were measured from the cross-sectional photograph of the monofilament by an optical microscope, and calculated by the above formula (1).

(2) Bending Hardness Index The bending hardness was measured according to the method of FIG. 1 described above, and was determined from the measured value according to the method of the above formula (2).

(3) Tensile Strength JIS L1013 Tensile strength and elongation were measured by a standard time test method (unit: mN / d).

(4) 100 ° C. Dry Heat Shrinkage Measured by JIS L1013 dry heat shrinkage B method.

(5) Weaving property The weaving property was evaluated by the number of yarn breaks during weaving with a sulzer loom for a width of 90 cm and a length of 100 m.

(6) Misalignment In accordance with JIS L1096 Yarn drawing method A method, the drawing force (unit: mN) of four threads was measured. In addition, a sensory test in which the insect repellent net was handled with a finger was evaluated as ⊚ for extremely difficult misalignment, ◯ for less misalignment, and Δ for easy misalignment.

(7) Wrinkle JIS L1096 Wrinkle resistance Drying Measured by method A. Also, grasp the insect screen with your hand and sensory evaluate the degree of wrinkling, making it extremely difficult to wrinkle ◎, difficult to wrinkle ○,
It was judged as Δ that wrinkles were likely to occur.

(8) Woven surface quality 1) Thread cracking and thread crushing Evaluation was made by the number of thread cracking and thread crushing observed in a sensory sensory test with a width of 90 cm and a length of 100 meters.

2) Comprehensive evaluation of woven surface quality The quality of the woven surface such as uneven mesh and smoothness of the woven surface was evaluated by a sensory sensory test, and was judged as ⊚: excellent, ○: good, Δ: acceptable, ×: defective. .

(9) Sash mounting property 1) Fitting property Evaluation was made by the number of times the jig was pushed into the groove of the sash frame until it was completely fitted and fixed with a rubber cord. ◎: within 2 times, ○: within 3 times, △: 9 times or less, x: 10 times or more.

2) Breakability JIS L1096 Bursting strength (unit: N) Measured and evaluated by the B method.

3) Detachability of sash frame The insect screen attached to the sash frame is pressed with a finger at a position 1 cm inside the sash frame, and the ease of removal from the sash frame is evaluated by a sensory test. It was determined that it was difficult to pull out, and that it was easy to pull out was Δ.

[Example 1] Melt flow rate 3.3 g
/ 10min PP (YK121-A manufactured by Chisso Corporation)
Was melted to 220 ° C by an extruder by a conventional method, spun from an air-blown hollow nozzle through a gear pump through a filtration layer in a spinning pack, and the spun hollow fiber was spun in a water bath at 20 ° C within 1.5 seconds. It cooled rapidly. The obtained hollow undrawn yarn was drawn in a hot air dry heating furnace at 140 ° C. at a draw ratio of 7.5 times. Then, a dry heat setting at 142 ° C. was performed to manufacture a PP hollow monofilament.

Next, using the obtained polyester hollow monofilament, an 18-mesh net was woven by a through-saw loom according to a conventional method, and then heat set by a roll type dry heat set machine to produce an insect repellent net.

The characteristics of the obtained PP hollow monofilament are shown in Table 1, and the weavability, quality and sash attachment of the insect screen are shown in Table 2.

[Example 2] Resin raw material was melted with PP having a melt flow rate of 3.3 g / 10 min (YK1 manufactured by Chisso Corporation).
21-A) 70 parts by weight and a mixture of 30 parts by weight of an olefin-based elastomer having a JIS-A hardness of 70 (MILASTOMER 7030N manufactured by Mitsui Petrochemical Industry Co., Ltd.) were used in the same manner as in Example 1 to prepare a repellent net. Manufactured.

The characteristics of the obtained PP hollow monofilament are shown in Table 1, and the weavability, quality and sash attachment of the insect screen are shown in Table 2.

[Example 3] A resin raw material was melted at a melt flow rate of 3.3 g / 10 min with PP (YK1 manufactured by Chisso Corporation).
21-A) 30 parts by weight and a mixture of 30 parts by weight of JIS-A hardness 70 and 70 parts by weight of olefin elastomer (MILASTOMER 7030N manufactured by Mitsui Petrochemical Industry Co., Ltd.) were used to prepare an insect repellent net in the same manner as in Example 1. Manufactured. The properties of the obtained PP hollow monofilaments are shown in Table 1, and the weavability, quality and sash attachment of the insect screen are shown in Table 2.

[Comparative Example 1] PVC compound (Vinica C3226 manufactured by Mitsubishi Kasei Vinyl Co., Ltd.) was melted to 210 ° C. by an extruder by a conventional method, spun from a nozzle having a round cross section through a filtration layer in a spinning pack through a gear pump. The yarn was taken out and the spun yarn was rapidly cooled in a hot water bath at 85 ° C. within 1 second.
The obtained solid undrawn yarn is drawn in a warm water bath at 95 ° C for 3.3 times in the first stage, and then in the second stage drawn in a hot air dry oven at 110 ° C for a total draw ratio of 5.0 times. Was stretched. Then, a dry set at 115 ° C. was performed to produce a PVC solid monofilament.

Next, using the PVC monofilament thus obtained, an 18-mesh net was woven by a through-saw loom according to a conventional method, and then heat-set by a roll-type dry heat set machine to produce an insect repellent net. The characteristics of the PVC monofilament are shown in Table 1, and the weavability, quality and sash attachment of the insect screen are shown in Table 2.

[Comparative Example 2] An insect screen was produced in the same manner as in Comparative Example 1 except that the spinning nozzle was an air blowing type hollow nozzle. The characteristics of the obtained PVC hollow monofilament are shown in Table 1, and the weavability, quality and sash attachment of the insect screen are shown in Table 2.

[Comparative Example 3] An insect repellent net was produced in the same manner as in Example 1 except that the spinning nozzle was a round cross-section nozzle.
The characteristics of the obtained PP solid monofilament are shown in Table 1, and the weavability, quality and sash attachment of the insect screen are shown in Table 2.

[Comparative Example 4] An insect repellent net was produced in the same manner as in Example 2 except that the spinning nozzle had a round cross section.
The characteristics of the obtained PP solid monofilament are shown in Table 1, and the weavability, quality and sash attachment of the insect screen are shown in Table 2.

[Examples 4 to 9] In Example 2, PP
An insect repellent net was produced in the same manner except that the spinning conditions of the system hollow monofilament were changed as shown in Table 1. PP
Table 1 shows the spinning conditions of the system hollow monofilament and the properties of the obtained PP hollow monofilament.
Table 2 also shows the quality and the sash attachment property.

[Embodiments 10 and 11] In Embodiment 2,
An insect repellent net was produced in the same manner except that the PP hollow monofilament diameter was changed as shown in Table 1. PP
Table 1 shows the spinning conditions of the system hollow monofilament and the properties of the obtained PP hollow monofilament.
Table 2 also shows the quality and the sash attachment property.

[Embodiments 12 and 13] In Embodiment 2,
An insect repellent net was produced in the same manner except that the hollow diameter ratio dr of the PP hollow monofilament was changed as shown in Table 1. Table 1 shows the PP-based hollow monofilament spinning conditions and the properties of the obtained PP-based hollow monofilaments, and Table 2 shows the weavability, quality and sash attachment of the insect screen.

Example 14 In Example 2, the flatness Fr of the PP type hollow monofilament is shown in Table 2 by increasing the contact angle between the hollow filament running in the cooling bath and the guide in the cooling bath. Insect repellent nets were prepared in the same manner except that they were different as indicated. Table 1 shows the PP-based hollow monofilament spinning conditions and the properties of the obtained PP-based hollow monofilaments, and Table 2 shows the weavability, quality and sash attachment of the insect screen.

Example 15 An insect repellent net was produced in the same manner as in Example 2 except that dry heat setting was not performed in the production of the PP hollow monofilament. Table 1 shows the PP-based hollow monofilament spinning conditions and the properties of the obtained PP-based hollow monofilaments, and Table 2 shows the weavability, quality and sash attachment of the insect screen.

[0088]

[Table 1]

[Table 2]

[0089]

INDUSTRIAL APPLICABILITY As described above, the insect repellent net made of the PP hollow monofilament of the present invention is less toxic and excellent in environmental protection than the conventional insect repellent net made of PVC monofilament, and is light in weight per unit weight. It has a large area, is economically advantageous, and has excellent sash attachment, wrinkle resistance, and misalignment resistance as compared with a conventional insect net made of PP solid monofilament.

Further, according to the method for producing an insect repellent net of the present invention, the insect repellent net having the above performance can be efficiently produced.

[Brief description of drawings]

FIG. 1 is an explanatory view of a method for measuring bending hardness of PP type hollow monofilaments constituting the insect net of the present invention.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display area E06B 9/52 E06B 9/52 F

Claims (12)

[Claims] 1. An insect repellent net comprising a woven polypropylene hollow monofilament having a hollow portion having a circular cross section formed in the center thereof. 2. The insect repellent net according to claim 1, wherein the polypropylene hollow monofilament has a melt flow rate of 20 g / 10 min or less. 3. The polypropylene-based hollow monofilament has a bending hardness index Bhi defined in the text of 9.8 or more and 17.0 or less.
Insect repellent net described. 4. The insect repellent net according to claim 1, wherein the polypropylene hollow monofilament has a flatness Fr defined in the text of 30% or less. 5. The ratio d / D of the hollow diameter d to the diameter D of the polypropylene-based hollow monofilament is 0.20 or more and 0.80 or less, and the thickness L of the thickest part to the thickness 1 of the thinnest part is The insect repellent net according to any one of claims 1 to 4, wherein the ratio L / ■ is 3.0 or less. 6. The insect repellent net according to claim 1, wherein the polypropylene hollow monofilament is made of polypropylene or a propylene copolymer containing 85% by weight or more of propylene units. 7. The insect repellent net according to claim 6, wherein the polypropylene hollow monofilament has a bending hardness index Bhi defined in the text of 16.0 or more and 17.0 or less. 8. A polypropylene-based hollow monofilament, comprising 50% by weight or more of polypropylene or a propylene copolymer containing 85% by weight or more of propylene units,
The insect repellent net according to any one of claims 1 to 5, which is composed of a mixture of 50% by weight or less of a thermoplastic elastomer having JIS-A hardness of 60 or more excluding vinyl chloride elastomer and fluorine elastomer. 9. The insect net according to claim 8, wherein the polypropylene-based hollow monofilament has a bending hardness index Bhi defined in the text of 9.8 or more and 16.0 or less. 10. The insect repellent net according to claim 1, wherein the polypropylene hollow monofilament has a diameter in the range of 0.05 mm to 0.50 mm. 11. A polypropylene hollow monofilament having a tensile strength of 35 mN / d or more and 100 mN / d or less,
And the 100 degreeC dry heat shrinkage is 15% or less, The insect repellent net | network of any one of Claims 1-10 characterized by the above-mentioned. 12. A polypropylene polymer is melt extruded from a hollow nozzle, introduced into a coagulation bath at 40 ° C. or lower within 2.0 seconds and rapidly cooled, and then 5.0 times or more 10 times at a temperature of 80 ° C. or higher and 160 ° C. or lower. By stretching at 0.0 times or less,
A polypropylene-based hollow monofilament having a hollow portion with a circular cross section formed at the center thereof, and then weaving this polypropylene-based hollow monofilament and heat-setting, wherein the insect repellent according to any one of claims 1 to 11. Manufacturing method of net.