JP2007110974A - Agricultural house band - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an agricultural house band preventing an agricultural film to be coated and spread on an agricultural house from causing rub and break, free from lowering transmittance, facilitating work of tying and untying work, hardly causing creep deformation, and free from adhesion excess when getting wet with rainwater. <P>SOLUTION: This agricultural house band is made of a net formed body which has 40 mm-250 mm width and whose netlike textile fiber intersection part is bonded and fixed. The agricultural house band has transmittance of ≥80%. <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 fiber having a width of 10 mm to 20 mm and a narrow width is known (for example, Patent Document 1). reference).

  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 scuffing and tearing of agricultural films, wide house bands are in contact with agricultural films and tend to collect rainwater, dew, etc. on the contact surface. Therefore, there is a problem that moss and mold are easily generated, and as a result, the light transmittance 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) low transmissivity, 3) insufficient bundling workability, and further for agricultural PO house bands When using a wide transparent film house band, 1) Excessive adhesion with the house covering film, 2) Resolving problems such as a decrease in transmissivity, and rubbing the agricultural film covered and spread on the agricultural house. It is an object of the present invention to provide an agricultural house band that does not cause a loss of light, does not lower the transmissivity, is easy to bind and unravel, is not easily deformed by creep, and does not excessively adhere when wet with rainwater or the like.

  The present inventors have intensively studied to solve such problems. As a result, it was found that the above problem was solved by an agricultural house band having a width of 40 mm to 250 mm and a net molded body in which the fiber intersections of the net-like woven fabric were bonded and fixed, and having a translucency of 80% or more. The present invention was completed based on the findings. In the present text, the state where the fiber intersection is not bonded and fixed is defined as “net-like woven fabric”, and the state where the fiber intersection is bonded and fixed is defined as “net molded body”.

The present invention is constituted by the following.
1. An agricultural house band having a width of 40 mm to 250 mm and a net molded body in which fiber intersections of a net-like woven fabric are bonded and fixed, and has a light transmittance of 80% or more.

2. Item 2. The agricultural house band according to Item 1, wherein the reticulated fabric has a yarn fineness of 110 to 3300 dtex, and the reticulated fabric has a warp yarn size of 0.4 mm to 100 mm.

3. Item 3. The agricultural house band according to Item 1 or 2, wherein the fiber of the net-like woven fabric is made of a thermoplastic resin.

4). Item 3. The agricultural house band according to Item 1 or 2, wherein the fiber of the net-like woven fabric is a polypropylene monolayer monofilament.

5. Item 3. The agricultural house band according to Item 1 or 2, wherein the fiber of the net-like woven fabric is a composite filament formed of a low-melting resin composed of a low-melting resin and a high-melting resin, and at least a part of the fiber surface is continuous.

6). The fibers of the reticulated fabric are high-density polyethylene, linear low-density polyethylene, polypropylene having a melting point of 130 ° C. or lower, or a low melting polyolefin resin that is a mixture thereof on the sheath side, and polypropylene having a melting point of 150 ° C. or higher on the core side. A polyolefin-based composite filament undrawn yarn obtained by composite spinning into a sheath-core type, wherein the ratio of the melt flow index of the low-melting polyolefin resin to the melt flow index of polypropylene having a melting point of 150 ° C. or higher is 1. Item 1 or 2, wherein the composite ratio of 1 to 10 and the sheath: core is 20:80 to 70:30 by weight and is stretched 1.5 to 10 times. Agricultural house band.

7). Item 7. The agricultural house band according to Item 6, wherein the composite filament is a monofilament.

8). Item 8. The agricultural house band according to Item 6 or 7, wherein the low melting point polyolefin resin on the sheath side is polypropylene having a melting point of 130 ° C or lower.

9. Item 8. The agricultural house band according to Item 6 or 7, wherein the low melting point polyolefin resin on the sheath side is linear low density 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. Further, it has practical advantages such as not reducing the transmissivity, reducing the growth of crops in the agricultural house, and facilitating the knot fixing work.

  Hereinafter, the present invention will be described in detail. The agricultural house band of the present invention is not particularly limited as long as it is a net molded body having a width of 40 mm to 250 mm and a fiber intersection of the reticulated fabric bonded and fixed, but a stable high quality reticulated fabric is economical. Therefore, a thermoplastic resin is preferable as the fiber material of the net-like woven fabric. 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 resin, polyvinylidene chloride resin, nylon resin, acrylic resin, 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 an example of the net molded body, details of a plain woven net molded body made of a polyolefin-based composite monofilament in which the intersections of warp and weft are bonded by heat bonding will be described. A composite monofilament is composed of a low-melting resin and a high-melting resin, and is a concentric sheath-core type if it is a composite monofilament made of two or more thermoplastic resins formed by a low-melting resin in which at least a part of the fiber surface is continuous. Any of an eccentric sheath core type, a parallel type, a sea island type, a hollow type and the like may be used. The low melting point resin is high density polyethylene, medium density polyethylene, low density polyethylene, linear low density polyethylene, ethylene-α olefin copolymer, ethylene-vinyl acetate copolymer, polypropylene having a melting point of 130 ° C. or less, and polypropylene-α olefin. Examples thereof include a copolymer and the like, or a mixture thereof. Examples of the high melting point resin include polypropylene having a melting point of 150 ° C. or higher.

  In the present invention, the reticulated fabric is obtained by a general loom and method. The weave structure is plain weave, twill weave, entangled weave, raschel weave or the like, but plain weave is preferred from the standpoint of productivity. The reticulated fabric is subjected to heat treatment by a general apparatus and method such as a hot roll, hot air, or steam to form a net molded body in which the intersections of warps and wefts (hereinafter abbreviated as “mesh”) are thermally bonded. The obtained net-like product is a net-like product that retains strength and is difficult to cause misalignment of the intersections and unraveling of the ends. Further, if there is no end unwinding or misalignment in the width direction of the house band made of a net molded body, in addition to the heat treatment described above, an adhesion method using a binder resin is exemplified, but there are many adhesion points at the intersections of the mesh portions This is preferable because the mesh portion is less likely to be misaligned and the end portion is less likely to unravel. The net-like material in which the intersection of the warp and weft of the house band is not adhesively bonded causes misalignment or unraveling of the ends, and cannot exert an effect of pressing a stable agricultural film for a long time. Accordingly, it is preferable that the entire mesh portion of the house band is adhesively bonded.

  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 a quencher, a photocatalyst, a fungicide, a pest repellent and a pest repellent can be added.

  The extrusion spinning method of the composite monofilament is possible by a known technique such as composite extrusion using two extruders and a parallel or sheath core type composite die. However, the spinning and stretching stability and the stretched composite are possible. It is preferable to use a concentric sheath-core type composite die which is advantageous in terms of difficulty in peeling off the monofilament sheath-core component interface layer.

The width | variety of the net molded object used for the agricultural house band of this invention is 40 mm-250 mm, Preferably it is 60 mm-150 mm. If the width is within the above range, the effect of pressing the agricultural film is sufficient, and the bundling property to the lower portions on both sides of the agricultural house at the time of covering and spreading is also good.
The transmissivity of the net molded body used for the agricultural house band of the present invention is 80% or more. The light transmittance is measured according to JIS K 7105, for example, as in the following examples. If the transmissivity is 80% or more, the growth of the crop in the agricultural house is sufficient.

  A preferred yarn fineness of the net-like woven fabric used in the agricultural house band of the present invention is 110 to 3300 dtex, and a preferred warp mesh size of the net-like woven fabric is 0.4 mm to 100 mm. If it is in said range, the effect | action which presses down the agricultural house film is enough, and the bundling property to the lower part of both sides of the agricultural house at the time of covering extension is also good. More preferably, the fineness of the reticulated fabric is 300 to 1300 dtex, and the warp yarn mesh of the reticulated fabric is 0.8 mm to 10 mm.

Melt mass flow rate (melt flow index) MFR ₁ of the low melting point polyolefin resin on the sheath side and the melt mass flow rate MFR of the high melting point polypropylene on the core side constituting the composite monofilament used for the net-like material in the agricultural house band of the present invention ₂ and the flow rate ratio of = MFR ₁ / MFR ₂ (hereinafter abbreviated as "FRR") is characteristic of the composite monofilament is expressed significantly in 1.1-10. The melt mass flow rate (hereinafter abbreviated as “MFR”) and FRR are measured according to JIS K 7210: 1999 (conditions M: 230 ° C., 2.16 Kg). When the FRR is within the above range, spinning and drawing properties are stable, and the thermal adhesiveness at the intersection of the warp and weft yarns in the net formed article is good.

  If the melting point of the high melting point component on the core side is 150 ° C. or higher, the strength that is the basic performance of the core side component can be obtained, and the shrinkability is reduced, and the shrinkage deformation is small when heat-setting the reticulated fabric. Become. Therefore, the melting point of the high melting point component is preferably 150 ° C. or higher. Moreover, the low melting point polyolefin resin on the sheath side imparts adhesiveness to the composite monofilament by thermal fusion. If the melting point of the low-melting polyolefin resin is 130 ° C. or less, the heat when the mesh fabric is heat-set becomes a low temperature for a short time. With this heat, the orientation of the composite monofilament core-side component is restored and the strength is lowered. Therefore, the melting point of the low-melting polyolefin resin is preferably 130 ° C. or lower in order to maintain the strength characteristics of the core-side component.

The sheath / core composite ratio is preferably in the range of 20:80 to 70:30 by weight. If the composite ratio is within the above range, the stretchability is good and the adhesive force at the intersection of the warp and weft is sufficient.
The draw ratio of the composite monofilament used in the present invention is preferably 1.5 to 10 times, and more preferably 5 to 8 times in terms of productivity and fiber strength. If the draw ratio is within the above range, the strength of the composite monofilament is sufficient, and there is no trouble such as peeling or peeling of the sheath side component in the drawing process. In addition, it is preferable to perform relaxation annealing by a general apparatus and method after the stretching step.

  The fiber constituting the net molded body is not limited to a composite monofilament, as long as it is composed of a low melting point resin and a high melting point resin, and is formed of a low melting point resin in which at least a part of the fiber surface is continuous. A composite multifilament may also be used. The composite multifilament can also be obtained by an ordinary method using the same material as the composite monofilament as described above.

  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) Light transmittance It implemented based on the light transmittance measuring method prescribed | regulated to JISK7105.
The larger the light transmittance, the more difficult the growth of the crop is likely to occur because the sunlight irradiation in the house is not inhibited.

(B) 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.

(C) 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.

(D) 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 usable level
.
×: 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.

(E) Growth failure 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.

Example 1
The core side component is polypropylene (PP1), a propylene homopolymer having a melting point of 162 ° C. and an MFR of 6.1 g / 10 min, and the sheath side component is ethylene at a melting point of 129 ° C. and an MFR of 15.5 g / 10 min. Using polypropylene (PP2) of propylene-ethylene-1-butene ternary random copolymer having an amount of 3.6 wt% and an amount of 1-butene of 2.7 wt%, two extruders having a diameter of 50 mm and an aperture of 1 Using a 5 mm sheath core type composite die, spinning by melt extrusion and cooling was performed at a die temperature of 250 ° C. to obtain a sheath core type composite undrawn yarn having a composite ratio of 40:60 by weight. This was stretched 7 times at 100 ° C. by a wet heat stretching apparatus to obtain a composite monofilament having a fineness of 320 dtex. This composite monofilament was used to weave a plain weave structure with a loom to obtain a mesh fabric with a mesh size of 1 mm, and then heat-set in a hot air heating tank to produce a net molded body in which fiber intersections were thermally bonded. Next, a house band having a width of 70 mm was manufactured from this net molded body with a slitter so that the longitudinal direction was the vertical direction. 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
It was manufactured and evaluated in the same manner as in Example 1 except that the house band width was 180 mm. The test results are shown in Table 1. The evaluation result of this house band was good.

Example 3
It was manufactured and evaluated in the same manner as in Example 2 except that the weave of the fabric was changed to 5 mm. The test results are shown in Table 1. The evaluation result of this house band was good.

Example 4
It was manufactured and evaluated in the same manner as in Example 1 except that the warp yarn fineness was 1100 dtex and the fabric texture was 3 mm. The test results are shown in Table 1. The evaluation result of this house band was good.

Example 5
It was manufactured and evaluated in the same manner as in Example 1 except that there was no sheath component, the draw ratio was 5 times, and the intersection was changed to binder resin bonding as a method for preventing the net edge from unraveling. The test results are shown in Table 1. The evaluation result of this house band was good.

Example 6
It was manufactured and evaluated in the same manner as in Example 1 except that there was no sheath component, the draw ratio was 5 times, and the end of the net was unraveled except that only the end was sewn with bias tape. The test results are shown in Table 1. The evaluation result of this house band was good.

Example 7
The core side component is polypropylene (PP3), a propylene homopolymer having a melting point of 160 ° C. and an MFR of 17.8 g / 10 min, and the sheath side component is ethylene at a melting point of 130 ° C. and an MFR of 33.2 g / 10 min. Using polypropylene (PP4) of propylene-ethylene-1-butene ternary random copolymer having an amount of 3.5 wt% and 1-butene amount of 2.6 wt%, two extruders having a diameter of 65 mm and a diameter of 0 .18 mm sheath-core type composite die was melt-extruded and spun by spinning at a die temperature of 230 ° C. to obtain a sheath-core type composite undrawn yarn with a composite ratio of 40:60 by weight. It was manufactured and evaluated in the same manner as in Example 1 except that this was stretched 5 times at 100 ° C. by a wet heat stretching apparatus to obtain a composite multifilament having a fineness of 330 dtex. The test results are shown in Table 1. The evaluation result of this house band was good.

Example 8
As a sheath component, a linear low density polyethylene (PE1) JIS K 7210: 1999 (condition D: 190 ° C., 2.16 Kg) having a melting point of 125 ° C. and an MFR of 12.3 g / 10 min, a mesh size of 5 mm, a fineness of 320 dtex, Manufactured and evaluated in the same manner as in Example 1 except that the weave of the end of the net was made of calami weave. The test results are shown in Table 1. The evaluation result of this house band was good.

Comparative Example 1
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 2. The film was broken due to the stress concentration of the house band, and the bundling workability was also poor.

Comparative Example 2
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 2. The house band and the house film were in close contact with each other, and it was difficult to rebind the loosening over time. Furthermore, since moss, algae, and mold were generated at the close contact portion between the house band and the house film, growth failure due to poor sunshine was observed.

Comparative Example 3
It was manufactured and evaluated in the same manner as in Example 1 except that the house band width was 20 mm. The test results are shown in Table 2. The film was broken by rubbing and by force concentration.

Comparative Example 4
It was manufactured and evaluated in the same manner as in Example 1 except that the house band width was 500 mm. The test results are shown in Table 2. Bundling workability was poor.

Comparative Example 5
It was manufactured and evaluated in the same manner as in Example 1 except that the fiber color tone was black. The test results are shown in Table 2. Growth failure due to reduced light transmittance was 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 (9)

  An agricultural house band having a width of 40 mm to 250 mm, a net molded body in which fiber intersections of a net-like woven fabric are bonded and fixed, and having a light transmittance of 80% or more.   2. The agricultural house band according to claim 1, wherein the reticulated fabric has a yarn fineness of 110 to 3300 dtex, and the reticulated fabric has a warp yarn size of 0.4 to 100 mm.   The agricultural house band according to claim 1 or 2, wherein the fibers of the net-like woven fabric are made of a thermoplastic resin.   The agricultural house band according to claim 1 or 2, wherein the fiber of the net-like woven fabric is a monolayer monofilament of polypropylene.   The agricultural house band according to claim 1 or 2, wherein the fiber of the net-like woven fabric is a composite filament formed of a low melting point resin and a high melting point resin, and formed of a low melting point resin in which at least a part of the fiber surface is continuous.   The fibers of the reticulated woven fabric are high-density polyethylene, linear low-density polyethylene, polypropylene having a melting point of 130 ° C. or lower, or a low melting polyolefin resin that is a mixture thereof on the sheath side, and polypropylene having a melting point of 150 ° C. or higher on the core side. A polyolefin-based composite filament undrawn yarn obtained by composite spinning into a sheath-core type, wherein the ratio of the melt flow index of the low-melting polyolefin resin to the melt flow index of polypropylene having a melting point of 150 ° C. or higher is 1. The composite ratio of 1 to 10, sheath: core is 20:80 to 70:30 by weight, and is obtained by stretching 1.5 to 10 times. Agricultural house band.   The agricultural house band according to claim 6, wherein the composite filament is a monofilament.   The agricultural house band according to claim 6 or 7, wherein the low-melting-point polyolefin resin on the sheath side is polypropylene having a melting point of 130 ° C or lower.   The agricultural house band according to claim 6 or 7, wherein the low melting point polyolefin resin on the sheath side is linear low density polyethylene.

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