JPH11198319A - Easily resource recoverable polyolefin composite sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reuse the object sheet as fuels and resources of other molding material without fractionating by a method wherein a filmy polypropylene resin is laminated to a whole woven and knitted stuff, the intersecting points of blended yarns of polypropylene multifilaments and fusible multifilaments in which are fusion-bonded. SOLUTION: This polyolefin composite sheet is made of blended yarns of polypropylene multifilaments and fusible multifilaments consisting of a polypropylene as a core and a polyethylene as a sheath. A filmy polypropylene resin is laminated to a whole woven and knitted stuff, the intersecting points of the blended yarns of which are fusion-bonded. As a result, the flexibility, durability and shape stability of the sheet are improved, resulting in allowing to use for various materials sheets and ruse used or un-used sheets as a molding material as it is without fractionating their constitutional stocks so as to realize their resource recovery.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polyolefin composite sheet for materials that can be easily recycled.

[0002]

2. Description of the Related Art Conventionally, as a sheet for flexible materials such as shutters, tents, canvases, etc., a fabric made of polyester filaments, polyamide filaments, etc. is sealed with a vinyl chloride resin in view of material costs and production costs.
Further, a composite sheet coated with a vinyl chloride resin is widely used. However, a composite sheet using such a vinyl chloride resin has a plasticizer contained in the vinyl chloride resin that bleeds to the sheet surface to cause tackiness, is easily stained, easily molds, and a used sheet is not easily used. ,
Incineration is not possible due to the inclusion of non-twistable vinyl chloride resin.
Further, since it is a composite of different materials, it is difficult to separate the materials, and it is almost impossible to recycle.

[0003] As a sandbag, a sheet obtained by laminating polypropylene with a polypropylene film yarn fabric is also known. However, the fabric itself has no binding force and is easily deformed, and is collected for the purpose of use as the sandbag. Difficult, making recycling impossible.

[0004]

DISCLOSURE OF THE INVENTION The present invention not only achieves the purpose of initial use, although it is known as an individual constituent material, it is composed entirely of polyolefin, has good form stability, and achieves the purpose of initial use. After achieving the initial use purpose, it can be used as fuel and other molding material resources without separation, and it is particularly excellent in terms of total cost from production to reuse compared to conventional products. It is to provide a sheet that can be easily recycled.

[0005]

SUMMARY OF THE INVENTION The present invention comprises a mixed yarn of a polypropylene multifilament and a fusible multifilament having a polypropylene core and a polyethylene sheath, and the intersection of the mixed yarn is fused. For woven and knitted fabrics
An easily recyclable polyolefin composite sheet in which a polypropylene resin is laminated in a film shape over the entire woven or knitted fabric.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION A mixed yarn constituting a woven or knitted fabric is composed of a polypropylene multifilament and a fusible multifilament having polypropylene as a core and polyethylene as a sheath. As a polypropylene multifilament, 50-
3000 denier is used, and there is no particular limitation on the number of constituent filaments of the multifilament, the fiber cross-sectional shape, and the like. In addition, as the fusible multifilament, polypropylene is used as a core, polyethylene is used as a sheath, and as long as it exhibits fusibility with easily fusible polyethylene by heating, the fineness, the number of constituent filaments, the fiber cross-sectional shape, etc. No restrictions.

It is preferable that the mixed yarn of the polypropylene multifilament and the fusible multifilament is twisted and integrated by ply twisting or the like from the viewpoint of imparting the strength of the woven or knitted fabric. Further, the ratio of the fusible multifilament in the mixed yarn is preferably 1 to 70% by weight from the viewpoint of the fusibility at the intersection of the mixed yarns, that is, the strength of the woven or knitted fabric.

The woven or knitted fabric composed of the mixed yarn of the polypropylene multifilament and the fusible multifilament may be in the form of a woven fabric or a knitted fabric, but is preferably a woven fabric. When the woven or knitted fabric is a woven fabric, the size of the eyes can be freely changed according to the purpose of use of the sheet of the present invention, and the sheet is required to have transparency since it is sealed by fusion after weaving. In this case, a coarse woven fabric, for example, a woven fabric having an opening ratio of 20% or more, can be easily obtained by plain weaving without using conventional complicated entangled weaving.

The woven or knitted fabric in the sheet of the present invention is a woven or knitted fabric in which the intersections of the mixed yarns of the polypropylene multifilament and the fusible multifilament are fused, and the woven or knitted fabric itself has shape stability to withstand deformation. The fusion of the mixed yarns at the intersections of the woven or knitted fabric is performed after weaving, knitting, etc., or after weaving, knitting, etc., by passing between heating rollers, contact heating to a hot plate or non-contact heating, etc. It is performed by being heated.

[0010] In the sheet of the present invention, a polypropylene resin is laminated on the entire woven or knitted material in a film shape on the woven or knitted material where the intersections of the mixed yarns are fused. The lamination of the polypropylene resin to the woven or knitted fabric is performed by discharging molten polypropylene resin from the die and penetrating the woven or knitted fabric into the front and back, and coating the entire woven or knitted fabric in a film form, or forming the polypropylene resin into a film form in advance, and weaving this film. It is performed by heat lamination between the knitted fabric and the heating roller. The polypropylene resin to be laminated is preferably a polypropylene elastomer in order for the sheet of the present invention to have flexible flexibility. Further, a light resistance stabilizer, a twist resistant agent, a coloring agent, and the like are appropriately added to the polypropylene resin to be laminated as necessary.

[0011] In the sheet of the present invention, the structure of the woven or knitted fabric, the size of the mesh, the thickness of the woven or knitted fabric, the thickness of the laminated film, etc. can be appropriately combined. In particular, the production method is simple and the use is more versatile. In some respects, the woven or knitted fabric is preferably a coarse plain weave fabric, and the sheet is preferably a sheet having transparency. The sheet of the present invention is a sheet of any form from a heavy cloth such as a tent cloth or a canvas to a lightweight cloth such as a roll-up shutter cloth, and is used as a material sheet in the same manner as a conventional material sheet.

[0012] In particular, the sheet of the present invention comprises a woven or knitted fabric and a film, and has a so-called fiber reinforced film configuration. However, since the entire sheet is composed only of polyolefin, bleeding with a plasticizer or the like is also possible. In addition to having the performance as a material sheet with excellent antifouling properties, light resistance, and excellent durability, it also has excellent handling properties after functioning as a material sheet compared to conventional material sheets. It has a remarkable effect.

[0013] That is, the sheet of the present invention is not only easy to incinerate without separating it, but also as it is or chipped, or further oiled and used as fuel after the initial use purpose is achieved as a material sheet. It can be formed into a bucket, a plastic container, or the like as a molding material, and can be easily used as a resource. Further, the sheet of the present invention is inexpensive as compared with conventional products in terms of total cost from production to reuse, and is extremely excellent in terms of effective use of resources.

[0014]

Next, an example of the sheet of the present invention will be specifically described together with a production example. As a yarn, a polypropylene multifilament manufactured by Mitsubishi Rayon Co., Ltd. (680d / 12
0f) and a ply-twisted yarn (150 T / M) of fusible filament yarn (680d / 60f) of core polypropylene and sheath polyethylene manufactured by Mitsubishi Rayon Co., Ltd. Woven organization Plain weave Standard length 6 / inch x width 6 / inch thickness The plain woven fabric obtained was woven to a thickness of 0.55 mm, and was heated by a non-contact heating device at a temperature of 150 ° C to fuse and seal the intersections of the yarns.

Next, the woven fabric was coated with a polypropylene elastomer manufactured by Mitsubishi Chemical Co., Ltd. in a tandem die laminating apparatus to a lamination thickness of 90 μm on each side in one step to obtain a sheet.
The obtained sheet has a tensile strength of 446 × width 366 (N / 3 cm width), an elongation of 27 × width 25 (%), a tear strength of 123 × width 177 (N), and a weight of 249 g / m ² . There was a sheet with.

The obtained sheet was extremely light and weighed about one-half as compared with a conventional polyester fiber base cloth coated with a vinyl chloride resin. The obtained sheet was used for a roll-up type roll shutter, but there was no stickiness between the sheets, and the winding and drawing were smooth. Also, cut the obtained sheet into 20cm x 60cm,
These were stacked and placed in a pressing mold and heated and shaped at a temperature of 220 ° C. to obtain a backboard of a chair, which was sufficiently strong in practical use.

[0017]

As described above, the sheet of the present invention is composed entirely of polyolefin and has good flexibility, durability and form stability. In addition to being used as various material sheets, used or unused sheets can be reused as molding materials as they are without separating constituent materials, and can be recycled,
In terms of total cost from production to reuse, it is cheaper than conventional products.

Claims (2)

[Claims] 1. A polypropylene multifilament,
It is composed of a mixed yarn with a fusible multifilament having polypropylene as the core and polyethylene as the sheath, and the intersection of the mixed yarn is fused to the woven or knitted material, and the polypropylene resin is laminated in a film form on the entire woven or knitted material. Polyolefin composite sheet that is easy to recycle. 2. The easily recyclable polyolefin composite sheet according to claim 1, wherein the woven or knitted fabric is a coarse plain woven fabric, and the sheet has transparency.