JP2007135585A - House band for agriculture - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a house band for agriculture, free from the trouble of the wear breakage of an agricultural film spread on a greenhouse, keeping light transmittance, enabling easy binding and unbinding work, resistant to creep deformation and preventing excessive contact in the case of wet with rainwater, etc. <P>SOLUTION: The house band for agriculture is composed of a woven fabric belt having a width of 20-200 mm, a longitudinal creep extension of ≤5% under 98N load and containing at least a flat yarn as the warp of the woven fabric. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a house band for holding an agricultural film to be coated and spread on an agricultural house.

  2. Description of the Related Art Conventionally, agricultural houses in which an agricultural film made of vinyl chloride resin or the like is coated on the outside of a frame constructed of metal pipes or the like have been widely used. In these agricultural houses, house bands that hold the film so as not to be blown away by strong wind and rain are used. As such a house band, a black band reinforced with a narrow fiber width of 10 mm to 20 mm, such as a polyethylene molded body whose both ends are reinforced with fibers or wires, is known (for example, Patent Documents). 1).

  In recent years, from the viewpoint of waste disposal, etc., it has been covered with polyolefin resin agricultural film (hereinafter abbreviated as “Agriculture PO”) instead of vinyl chloride resin agricultural film (hereinafter abbreviated as “Agriculture”). There are many more agricultural houses. However, Agricultural PO has a drawback of low wear resistance compared to conventional agricultural bean. For this reason, when a conventional narrow fiber reinforced black band is used, the agricultural PO may be rubbed and whitened at a contact portion with a hard portion such as a fiber reinforced portion, and rubbing may occur. Generally, as the width of the house band is narrower, the force concentrates on the contact portion with the film, so that the film is rubbed and broken more severely in a strong wind environment. Further, since the black band does not transmit light, there is a problem that the irradiation of sunlight to the inside of the house is blocked and the growth is partially disturbed.

  In addition, since conventional house bands are hard, not only is it difficult to tie and fix to the bottom of both sides of an agricultural house (hereinafter referred to as “bundling”) when spreading the sheath, but the binding may loosen or creep after spreading the sheath. Because elongation due to deformation occurs and the agricultural film flutters, it is necessary to re-bundling the lower part of both sides of the house periodically. It has been desired to eliminate the complexity of the binding and unwinding work.

  Therefore, a wide transparent film house band has been proposed for agricultural PO house bands (see, for example, Patent Documents 2, 3 and 4). Although these house bands are translucent and are excellent in suppressing the rubbing and tearing of the agricultural film, they have a problem that the agricultural film flutters quickly after being stretched because the binding property is inferior. In addition, the wide house band is in contact with the agricultural film on the surface, and rain water, dew, etc. tend to accumulate on the contact surface, so that moss and mold are likely to be generated, and as a result, there is a problem that the transmissivity is greatly reduced. Furthermore, it has been pointed out that the contact surface becomes wet and excessively wet due to rain water, dew, etc., and the adjustment work is difficult when the house band is loosened, and improvement of these problems is desired. Also, flexible ropes or nets, belt-like sheets or nets have been proposed for the film presser of the house, but there is no detailed description of specifications or effects. (For example, see Patent Documents 5 and 6)

Japanese Utility Model Laid-Open No. 1-114196 Japanese Patent Laid-Open No. 2000-166397 JP 2001-120077 A JP 2003-289725 A JP 58-170414 A Japanese Patent Laid-Open No. 62-296820

  In the present invention, when the above-described conventional agricultural house band (black band) is used, 1) rubbing and tearing, 2) reduction in illuminance in the house, 3) insufficient bundling workability, 4) loosening after bundling Solve the problems such as 1) fluttering after spreading due to poor binding, 2) lowering of illuminance in the house, etc. An agricultural house band that does not cause excessive wear when the agricultural film covered and spread on an agricultural house does not rub and tear, does not reduce the illuminance in the house, and is wet with rainwater that is easy to bind and unwind. The purpose is to provide.

  The present inventors have intensively studied to solve such problems. As a result, it is made of a belt-shaped woven fabric having a band width of 20 mm to 200 mm, the creep elongation in the longitudinal direction at a load of 98 N (10 kgf) is 5% or less, and the warp yarn of the woven fabric contains at least a flat yarn. The present invention was completed based on the knowledge that the above-mentioned problems were solved by the characteristic agricultural house band.

The present invention is constituted by the following.
1. Agricultural house characterized by comprising a belt-shaped woven fabric having a band width of 20 mm to 200 mm, a longitudinal creep elongation at a load of 98 N of 5% or less, and the warp yarn of the woven fabric including at least a flat yarn. band.

2. 2. The agricultural house band according to item 1, wherein the bending resistance in the longitudinal direction is 5 cm to 25 cm.

3. Item 3. The agricultural house band according to Item 1 or 2, wherein the tensile breaking strength in the longitudinal direction is 600 N or more and the tensile breaking elongation is 100% or less.

4). Item 4. The agricultural house band according to any one of Items 1 to 3, wherein the warp yarn of the woven fabric is composed of a flat yarn and a monofilament.

5. The agricultural house band according to any one of Items 1 to 4, wherein the flat yarn is made of a thermoplastic resin.

6). Item 6. The agricultural house band according to Item 5, wherein the thermoplastic resin is a polyolefin resin.

7). Item 6. The agricultural house band according to Item 5, wherein the thermoplastic resin is polyethylene.

  The agricultural house band of the present invention can be used as an agricultural film house band including the agricultural PO that is coated and spread on the agricultural house, and does not cause rubbing and is wider than the conventional black band. Demonstrates the action of holding agricultural films. Furthermore, it has practical advantages such as not reducing the illuminance and light transmittance in the house, reducing the growth of crops in the agricultural house, and facilitating the work of tying and fixing.

Hereinafter, the present invention will be described in detail. The agricultural house band of the present invention comprises a belt-shaped woven fabric having a band width of 20 mm to 200 mm, a longitudinal creep elongation at a load of 98 N is 5% or less, and the warp yarn of the woven fabric is at least a flat yarn. There is no particular limitation as long as it is a molded body that contains it, and a configuration in which multifilaments or monofilaments are added to the flat yarn can be exemplified. In particular, warp yarns having monofilaments added are preferable in terms of wear resistance and durability. When the band width is constant, the higher the number of warp yarns, that is, the weaving density, the better the mechanical strength, but the flexibility is lost and the binding property is lowered. On the other hand, when the weaving density is constant, the larger the warp yarn diameter, that is, the fineness, the better the mechanical strength, but the flexibility is lost and the binding property is lowered. The fineness of the flat yarn is 220 to 6600 dtex, preferably 550 to 2200 dtex, and the weaving density is 10 / 25.4 mm to 100 / 25.4 mm, preferably 20 / 25.4 mm to 50 / 25.4 mm. . The fineness of the monofilament is 220 dtex to 1100 dtex, preferably 330 dtex to 770 dtex, and the weave density is 4 / 25.4 mm to 50 / 25.4 mm, preferably 10 / 25.4 mm to 30 / 25.4 mm. In addition to the uniaxially stretched slit tape, the flat yarn can be exemplified by a split yarn in which the tape is finely split into a thread. In order to obtain a stable and high quality woven fabric economically, the material of the woven fabric is preferably a thermoplastic resin. The thermoplastic resin is not particularly limited as long as it can be spun, and examples thereof include polyolefin resins such as polyethylene and polypropylene, polyethylene terephthalate resins, polyvinylidene chloride resins, nylon resins, acrylic resins, and the like. A polyolefin resin that is easy to transport, relatively inexpensive, excellent in mechanical properties, and easy to dispose of waste is particularly preferable.

  As long as the weft of the belt-shaped woven fabric does not collapse the woven fabric structure, the smaller the fineness and the higher the density, the better the binding property. The type of weft yarn is not particularly limited, and examples thereof include monofilament, multifilament, and flat yarn.

  These resins or mixtures thereof include stabilizers and coloring agents such as antioxidants, ultraviolet absorbers and light stabilizers that are usually added to polyolefin resins as necessary, lubricants, antistatic agents, antibacterial agents, glosses, and the like. Additives such as quenchers, photocatalysts, pest repellents, fungicides, and bird repellents can be added.

  As an example of the belt-shaped woven fabric, details of a tape-shaped woven fabric in which the warp / weft yarn is made of a polyolefin-based flat yarn will be described in detail.

  The flat yarn is produced by forming a film by the extrusion T-die method or extrusion inflation method, slitting the film once cooled and solidified, and then reheating it to 70 to 120 ° C., preferably 80 to 110 ° C. The film is stretched 10 to 10 times, preferably 5 to 8 times, and a flat yarn is formed through an annealing treatment. The structure of the yarn may be either single layer / multi-layer, but for the purpose of bonding at the intersection after weaving, the outer layer may be heat-bonded by using a multilayer yarn composed of a resin having a melting point lower than that of the inner layer for warp / weft. . Spinning by the extrusion method can be performed by a known technique such as multilayer extrusion using a plurality of extruders.

  In the present invention, the belt-shaped woven fabric is obtained by arranging the obtained flat yarn on the warp / weft and using a conventional shuttle loom, rapier loom, air jet loom, water jet loom, power loom, circular loom, belt loom, etc. can get. Examples of the weave structure include plain weave, twill weave, tangle weave, raschel weave, knit weave, and pattern weave, but plain weave and twill weave are preferred from the standpoint of productivity. As a method of obtaining a belt with a predetermined width from a wide original fabric, it is possible to process the original fabric bonded at the intersection point with a general slit. , Fusion welding tape, or bias tape sewing.

The width | variety of the belt-shaped woven fabric molded object used for the agricultural house band of this invention is 20 mm-200 mm, Preferably it is 30 mm-80 mm. If the band width is within the above range, the effect of pressing the agricultural film is sufficient, and the binding property to the lower portions on both sides of the agricultural house at the time of covering and spreading is also good.
The house band is creep-deformed and stretched during stretching by the tension received during the bundling operation, and as a result of losing the force to hold down the agricultural film, the agricultural film fluttering becomes particularly noticeable at high temperatures in summer. From the viewpoint of preventing this, the creep elongation in the longitudinal direction at a load 98N of the agricultural house band of the present invention is preferably 5% or less. For example, as shown in the examples described later, the creep elongation is measured by changing one end of a 5 m long house band to the lower part of the house and applying a 98 N load to the other end and changing the length between marked lines after 30 days. Is calculated based on

  The bending resistance in the longitudinal direction of the agricultural house band of the present invention is preferably 5 cm to 25 cm. The bending resistance is measured according to the JIS L 1096 bending resistance A method, for example, as in the examples described later. If the bending resistance is in the above range, there is no tear due to insufficient strength, and there is no deterioration in binding properties due to insufficient flexibility.

  The tensile strength at break in the longitudinal direction of the agricultural house band of the present invention is preferably 600 N or more. If it is 600 N or more, even if the agricultural house film is stretched by a strong wind, the band itself can be broken. The tensile elongation at break in the longitudinal direction of the agricultural house band is preferably 50% or less. 30% or less is more preferable from the viewpoint of preventing fluttering of the agricultural film and preventing creep deformation during use. The above-described tensile breaking strength and elongation are measured according to JIS L 1096, for example, as in the examples described later.

EXAMPLES Hereinafter, although this invention is demonstrated in more detail based on an Example, this invention is not limited to these Examples. Next, physical property measurement methods and performance evaluation methods used in Examples and Comparative Examples are shown.
(A) When constructing a house band with a creep elongation length of 5 m as a film restraint for an agricultural house, one end of the band is fixed to the lower part of the house, and 98N load is applied to the other end and the length between marked lines after 30 days The change of was measured. The measurement was performed outdoors under high temperatures in summer, and was performed in an environment where the outdoor temperature during the day was 30 to 35 ° C and the outdoor temperature after sunset was 20 to 25 ° C. The 98N load elongation is obtained from the following formula. A smaller value means that the house band is less likely to be deformed by the stress that the house band continuously receives due to strong wind or bundling work. 98N load elongation (%) = (change in length between marked lines ÷ original band length) × 100

(B) Bending softness It carried out based on JIS L 1096 bending softness A method (45 degree cantilever method).
It becomes an index of the bending rigidity of the house band molded body, and the larger the numerical value, the higher the rigidity and the stronger the so-called “waist”. The smaller the numerical value, the lower the rigidity. Therefore, it is an ideal characteristic that is easy to bind and not loose. Moreover, the width dimension of the sample used for the measurement was not adjusted for cutting, and the measurement was performed with the specified band width.

(C) Tensile breaking strength and elongation It implemented according to the tensile test measuring method prescribed | regulated to JISL1096.
The test piece dimensions were measured with a specified band width x length of 300 mm, a strograph ((trade name), manufactured by Toyo Seiki Seisakusho Co., Ltd.) at a distance between chucks of 200 mm and a tensile speed of 200 mm / min. Since the sample clamped by the chuck during measurement is slippery and its elongation is greatly affected, it is desirable to measure by attaching an anti-slip appropriately.

(D) Friction rupture of agricultural house film A vertical agricultural house with a mouth of 6 m was covered with a house band while the agricultural house film was stretched, and visually observed after 3 months. The farmhouse was set up in Shohoku-gun, Kumamoto Prefecture.
A: Since the agricultural house film is securely pressed without loosening, there is no rubbing and breaking.
○: Although there is a slight loosening, there is no rubbing and rubbing because the house film is pressed.
Δ: Slightly ruptured due to rubbing because the house film was pressed.
X: There was looseness, but it was in contact with the house film, but the pressing effect was not exhibited, so rubbing and breaking occurred. Unusable level.
XX: Lots are loose and contact with the house film is insufficient, so the house film swells greatly and rubs and breaks in a wide area during strong winds. Unusable level.

(E) Stress-concentrated rupture of agricultural house film It was carried out simultaneously with the rubbing rupture evaluation of the agricultural house film. It was visually observed whether or not the fracture was caused by stress concentration on the agricultural house film near the aggregate shoulder by the house band. (See figure)
A: No breakage of the agricultural house film.
○: Although fine flaws are confirmed on the surface of the agricultural house film, no tears including pinholes are observed.
(Triangle | delta): Although the fine fracture | rupture by an abrasion is observed, it is a level which is satisfactory practically.
X: Breakage is confirmed mainly at the point of contact with the house aggregate.
XX: Breaking is confirmed over a high range.

(F) Bundling and unwinding workability The above agricultural house film was confirmed by rubbing and breaking evaluation.
A: Work can be performed promptly. Almost no loosening after binding occurs.
○: Work can be performed promptly. Some loosening occurs after binding.
Δ: Some work is required, but the work can be performed. Looseness over time after bundling occurs but is usable.
×: Work is possible while taking time. Unusable due to loosening with time after binding.
XX: Bundling work itself is difficult. Unusable due to loosening in a short time after unity.

(G) Wear resistance / durability of house band This was carried out simultaneously with the rubbing fracture evaluation of the agricultural house film. After one year, a visual evaluation of the band surface was performed.
A: No change is observed on the surface of the house band, and the initial state is maintained.
○: The initial state is maintained except that fine scratches are confirmed on the surface of the house band.
Δ: A level where there is no problem in practical use although fuzz due to scratches is confirmed on the surface of the house band.
X: The warp yarn was partially broken due to scratches on the surface of the house band, and if used continuously, there is a possibility of developing into a band break.
XX: Many warp yarn breaks due to scratches on the surface of the house band were confirmed, and the possibility of band breakage is high.

(H) Growth hindrance The above agricultural house film was confirmed by rubbing fracture evaluation.
A: No occurrence at all.
○: Almost no occurrence.
Δ: A level that occurs somewhat but does not cause a problem.
X: Occurrence is observed and the level is unusable.
XX: Remarkably generated.

(I) Blocking with house-covered film A: Not generated at all.
○: Almost no occurrence.
Δ: A level that occurs somewhat but does not cause a problem.
X: Occurrence is observed and the level is unusable.
XX: Remarkably generated.

Example 1
As flat yarn, high density polyethylene (density = 0.959 g / cm ³ , melting point = 134 ° C., melt mass flow rate = 0.8 g / 10 min; JIS K 7210: 1999 (condition D: 190 ° C., 2.16 Kg) Measured according to the above.) Polyethylene (PE1) having a diameter of 60 mm was extruded from a die at a melting temperature of 240 ° C. by a T-die extrusion method using a 60 mm diameter extruder, cooled with a chill roll to form a film, slit into a predetermined width, and stretched. A flat yarn (FY1) having a fineness of 1100 dtex was obtained by a temperature of 100 ° C., a draw ratio of 8 times, an annealing temperature of 120 ° C., and a dry heat drawing apparatus method. PE1 is used as a monofilament, and the filament is extruded from a spinning die at a melting temperature of 260 ° C. with an extruder having a diameter of 50 mm. After cooling, the drawing temperature is 100 ° C., the draw ratio is 8 times, the annealing temperature is 120 ° C. A 330 dtex monofilament (MF1) was obtained. This monofilament is used for the weft, the warp yarn is FY1, and the weaving machine is a plain weaving farmhouse with a weaving density = 20 / 25.4mm, weft density = 20 / 25.4mm, and a band width of 40mm. A band was manufactured. See Figure 1 for an agricultural house using this house band. The test results are shown in Table 1. The evaluation result of this house band was good.

Example 2
Example 1 with the exception of using FY1 for the warp and weft yarns and using a band loom to make a plain weave with a warp density = 20 / 25.4 mm, weft density = 10 / 25.4 mm, and a band width of 25 mm. Similarly, an agricultural house band was manufactured. See Figure 1 for an agricultural house using this house band. The test results are shown in Table 1. The evaluation result of this house band was good.

Example 3
An agricultural house band was produced in the same manner as in Example 1 except that FY1 was used as the warp yarn and a plain weaving with a warp weaving density of 40 pieces / 25.4 mm was made with a band loom. See Figure 1 for an agricultural house using this house band. The test results are shown in Table 1. The evaluation result of this house band was good.

Example 4
PE1 is used as a monofilament, and the filament is extruded from a spinning die at a melting temperature of 260 ° C. with an extruder having a diameter of 50 mm. After cooling, the drawing temperature is 100 ° C., the draw ratio is 8 times, the annealing temperature is 120 ° C. A 440 dtex monofilament (MF2) was obtained. An agricultural house band was produced in the same manner as in Example 1 except that MF2 and FY1 were used as warp yarns, and a plain weave density of the warp weaving density = (27 FY1s + 13 MF2s) /25.4 mm was used with a band loom. . See Figure 1 for an agricultural house using this house band. The test results are shown in Table 1. The evaluation result of this house band was good.

Comparative Example 1
It was manufactured and evaluated in the same manner as in Example 1 except that the band width was 10 mm. The test results are shown in Table 1. The house film rubbed and ruptured due to the large creep elongation. Since the band width was as narrow as 10 mm, the stress concentration fracture of the house film also occurred.

Comparative Example 2
It was manufactured and evaluated in the same manner as in Example 1 except that the band width was 250 mm. The test results are shown in Table 1. Bundling workability was poor. Furthermore, because of its wide width of 250 mm, some growth disturbance due to poor sunshine in the house was seen.

Comparative Example 3
A house band with a black band width of 10 mm in which reinforcing yarns were inserted at both ends was used. See Figure 2 for an agricultural house using this house band. The test results are shown in Table 1. Breaking due to stress concentration of the house film was observed, and the bundling workability was also poor due to the high bending resistance.

Comparative Example 4
Evaluation similar to Comparative Example 1 was performed except that a house band made of a transparent film and having a band width of 70 mm was used. See Figure 3 for an agricultural house using this house band. The test results are shown in Table 1. Since the house band is easily blocked from the agricultural house covering film, it is difficult to re-bind the band. In addition, moss and fungi were easily generated because water was likely to stay at the above-mentioned blocking interface, and growth failure due to poor sunshine in the house was also observed.

It is the schematic of the agricultural house using the agricultural house band of this invention. It is the schematic of the agricultural house using the conventional narrow house band. It is the schematic of the agricultural house using the conventional transparent film house band.

Explanation of symbols

1: Frame of metal pipe 2: Agricultural film 3: Agricultural house band of the present invention 4: Conventional house band 5: Wide film for agricultural PO film

Claims (7)

  Agricultural house comprising a belt-shaped woven fabric having a band width of 20 mm to 200 mm, a creep elongation in the longitudinal direction at a load of 98 N of 5% or less, and the warp yarn of the woven fabric contains at least a flat yarn. band.   2. The agricultural house band according to claim 1, wherein the bending resistance in the longitudinal direction is 5 cm to 25 cm.   The agricultural house band according to claim 1 or 2, wherein the tensile breaking strength in the longitudinal direction is 600 N or more and the tensile breaking elongation is 50% or less. The agricultural house band according to any one of claims 1 to 3, wherein the warp yarn of the woven fabric comprises a flat yarn and a monofilament.   The agricultural house band according to claim 1, wherein the flat yarn is made of a thermoplastic resin.   The agricultural house band according to claim 5, wherein the thermoplastic resin is a polyolefin resin.   The agricultural house band according to claim 5, wherein the thermoplastic resin is polyethylene.

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