JP2008007149A - Air-permeable and flexible container - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air-permeable and flexible container, which is preferable for transportation and storage of heat-treated powder while some characteristics such as high strength, flexibility, anti-creep and catching and the like are being held. <P>SOLUTION: A fabric in which flat yarns with a fineness of 500 to 3,000 deniers, which is obtained by making slits in a thermoplastic synthetic resin film are woven into a plain weave structure comprised of multilayered flat yarns folded into two to four layers applied as a fabric comprising the having a thicknesses of twice to four times of the flat yarns in all warps or woofs and vertical fabric, and this fabric is applied to the upper part of a flexible container body to assure its air permeation. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a flexible container having a vapor scattering property mainly used for transporting and storing heated powder, heat-treated soil, titanium, cement and the like.

Recently, we have woven a flat yarn with high strength by slitting and stretching a synthetic resin film, and a flexible container using the base fabric is used to transport and store powders of industrial raw materials and food raw materials. Contributing to This flexible container is light and inexpensive, and is used in large quantities because of its transportation efficiency advantage that it can be folded and transported when not in use.
Japanese Patent Application No. 6-187072 Japanese Patent Application No. 8-12956 JP-A-57-28780 Shokai 60-47282 Japanese Utility Model Sho 62-28794

  A flexible container that uses a woven fabric as it is is strong enough to withstand the transfer of the contents, and a flat yarn is densely driven into the background to prevent leakage due to misalignment of the woven fabric. Or laminated with a film is used. Therefore, although it does not laminate, it has a certain degree of air permeability, but it needs to be packed in a container continuously and hot after manufacturing, for example, heat-treated soil. At that time, the normal product cannot dissipate water vapor from the top in the packed state. Alternatively, it takes a long time for heat dissipation, and it is inappropriate to use it as it is.

  As the breathable flexible container, weaving using yarns with different shrinkage filaments with different heat shrinkage (Japanese Patent Laid-Open No. 57-28780) or yarns using a specific resin composition Are disclosed in Japanese Laid-Open Utility Model Publication No. 60-47282 and those composed of a coarse outer mesh body and a fine inner mesh body (Japanese Utility Model Sho 62-28794). These have problems such as special yarns and weaving structures, poor production efficiency, and complicated bag structures, which are not fully satisfactory.

  Therefore, in the present invention, there is no leakage of contents while having sufficient air permeability and strength, and it can be produced efficiently and inexpensively, especially special soil, feed that must be filled immediately after heat treatment, The object is to provide a breathable flexible container effective for transporting and storing agricultural products.

  The present invention is a woven fabric in which a flat yarn having a fineness of 500 to 3,000 denier obtained by slitting and stretching a thermoplastic synthetic resin film is woven with a plain weave structure composed of multilayer flat yarns folded into 2 to 4 layers. A warp or weft is a multi-layer flat yarn having a thickness 2 to 4 times that of the flat yarn, and a woven fabric including a vertical blanking portion. The woven fabric is formed on the upper portion of the flexible container body. Breathable flexible container characterized by. In addition, a breathable flexible container comprising three kinds of breathable woven cloth, cloth cloth, and laminated cloth cloth can be provided.

  Here, as a synthetic resin used for the flat yarn, a homopolymer or an intercopolymer of α-olefin such as ethylene and propylene, or these α can be used as stable quality and economical mass production in continuous production. -Polyolefin-based synthetic resins composed of copolymers of olefins and other comonomers are most suitable, but polyamide-based synthetic resins such as nylon, polyester-based synthetic resins such as polyethylene terephthalate, polyvinyl chloride-based synthetic resins Also, a thermoplastic synthetic resin such as a polyvinylidene chloride-vinyl copolymer synthetic resin may be used. Of these, propylene is most preferred.

  Here, the flat yarn is formed by melting and kneading the above-described thermoplastic synthetic resin in an extruder cylinder, extruding and cooling it in an amorphous state by a T-die flat method or an inflation method, It is a high-strength tape-shaped yarn that is chopped to a width of 10 to 30 mm, and is uniaxially stretched and oriented in the longitudinal direction about 2 to 8 times by a hot plate or a heat roll, and is subjected to heat treatment. The flat yarn as the yarn material of the flexible container is employed with a fineness of 500 to 3,000 denier, more preferably 1,000 to 2,000 denier. Those with a fineness of less than 500 denier cannot provide sufficient strength as a woven fabric, and those with a fineness of more than 3,000 denier have poor weaving efficiency and creep resistance as container woven fabric. It becomes a problem. Moreover, the thickness of such a flat yarn is usually about 15 to 75 micrometers.

  Next, the multilayer flat yarn is a high-strength tape-like yarn having a width of 0.5 to 2 mm in which the flat yarn is folded into four layers. The flat yarn as the yarn material of the flexible container is employed with a fineness of 500 to 3,000 denier, more preferably 1,000 to 2,000 denier. It is folded in W and preferably has a width of 1 mm. Further, the thickness of the multilayer flat yarn is usually about four times that of 15 to 75 micrometers.

  A thick multi-layer flat yarn that has been entirely driven into a flat yarn woven fabric will exhibit an opening due to the thickness at the crossing portion constituted by the multi-layer flat yarn or the multi-layer flat yarn. In addition, by removing one out of every five warp yarns, the void area can be obtained most reliably. The air permeability through the opening can be improved while maintaining the strength and durability of the woven fabric.

  The removal of the warp for the gap can be appropriately selected according to the required air permeability according to the container contents, for example, the fourth of the warp and the sixth of the warp Can be designed in the warp removal condition of

  A flexible container is bag-made using these breathable woven fabrics as an upper part. In general, a flexible container consists of a top surface, a body, and a bottom surface. Openings for filling and discharging contents are opened on the top and bottom surfaces, and straps are attached to the openings so that they can be opened and closed. A cylindrical member is suspended and a suspension is formed for transfer. The breathable flexible container of the present invention uses the above-described woven fabric with excellent breathability at least on the upper surface portion.

  The flexible container according to the present invention replaces the conventional flat yarn with a thick multilayer flat yarn in place of the yarn used for the woven fabric, so it does not require special materials and processes and is inexpensive and efficient. Suitable for transportation and storage of agricultural products because it can be manufactured well and the flexible container does not deteriorate the physical properties such as high strength, flexibility, creep resistance, etc. In addition, it can be effective as a breathable flexible container that can disperse steam in a state in which the contents are packed in the container by setting the breathability.

  Hereinafter, the structure of the present invention will be described with reference to examples.

  Example Polypropylene (MFR = 0.8, melting point 145 degrees) is used as a thermoplastic synthetic resin, extruded in an amorphous state from a circular die at a melting temperature of 280 degrees, cooled to form a film, and heated plate contact type stretching method A flat yarn having a drawing temperature of 145 ° C, an annealing temperature of 150 ° C, a draw ratio of 5.6 times and a fineness of 1,500 denier (tape width 4.8 mm, tape thickness 57 micrometers) was obtained.

  The flat yarn was a four-layer flat yarn, which is a flat multilayer filament having a W-shaped fineness of 1,450 denier (tape width 1.2 mm, tape thickness 245 micrometers).

  Using this multilayer flat yarn, weaving with plain weave structure with a driving density of 15X15 / inch, using a circular loom (8 shuttle type), we used 4 layers of flat yarn for all warp and weft. Using this, the flat yarn was driven all over to make a woven fabric, and one of the four warps was pulled out and used as a woven fabric on the upper part of the bag to obtain a breathable flexible container.

  Here, out of the eight shuttles for driving wefts, the flat monofilaments were driven into the four-layer flat yarn woven fabric at regular intervals by installing a four-layer flat yarn as a flat monofilament on several shuttles and operating the loom. Example 1 is a woven fabric in which all the warp yarns are replaced with four-layer flat yarns, Example 2 is one in which ¼ of the warp yarns are lost to create voids, and Example 3 is a warp yarn. 1/5 was lost and voids were produced, and voids were arranged at regular intervals in a multilayer flat yarn woven fabric, resulting in a container woven fabric with a driving density of 20 × 20 pieces / inch.

FIG. 1 shows a side view of a breathable flexible container used in Example 1, and FIG. 2 shows a view from the top of the woven fabric of the breathable flexible container. Each warp and weft represents a structure in which a longitudinal opening 3 is opened at an intersection with a multilayer flat yarn.
When these flexible containers were filled with soil as the contents and transferred, each example had no soil spillage or exposure through the woven fabric as in the comparative example, and each example had the same physical properties as the conventional product. However, it has been confirmed that the flexible container has air permeability while having no problem in practical use.

  Since the present invention has a vapor scattering property mainly used for transportation and storage of heated powder, heat-treated soil, titanium, cement, etc., the industrial application is highly possible and useful as a flexible container.

It is a partial side view of the flexible container which is one of the embodiments of the present invention. It is a top view of the flexible container which is one of the embodiments of the present invention. It is a bottom view of the flexible container which is one of the embodiments of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Suspension belt 2 Input port 3 Input opening / closing 4 Multilayer flat yarn cloth 5 Reinforcement cloth 6 Main body upper part 7 Caution label 8 Main body lower part 9 Bottom 10 Discharge port throttle tape 11 Discharge port 12 Slider 13 Bottom support rope 14 Discharge rope

Claims (2)

A woven fabric woven with a plain weave structure consisting of multi-layer flat yarn obtained by slitting and stretching a thermoplastic synthetic resin film and flattening a fine yarn of 500 to 3,000 denier into 2 to 4 layers, and warp or weft A multi-layer flat yarn having a thickness 2 to 4 times that of the flat yarn and a breathable woven fabric including a blank portion in a warp, and using the breathable woven fabric on the upper portion of the flexible container main body. A breathable flexible container. A breathable flexible container comprising the three types of breathable woven fabric, cloth woven fabric, and laminated cloth woven fabric according to claim 1.

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