JP2001151301A - Polyethylene-based translucent garbage collecting bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of effectively utilizing polyethylene-based film waste materials for promoting recycling thereof and to provide a garbage collecting bag obtained by using the method. SOLUTION: In this polyethylene-based translucent garbage collecting bag, pellet type polyethylene film waste materials are formed into a film at a prescribed temperature by a film forming machine.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waste film of polyethylene film comprising a packaging film of a polyethylene resin material, a bag making loss of a packaging bag, a cut end of an inflation film, a printed polyethylene film of a waste plate, and the like. Garbage collection bag obtained by recycling polyethylene film waste material, so that polyethylene-based film can be produced by recycling the garbage, and it can be effectively used as a garbage collection bag. It is about.

[0002]

2. Description of the Related Art In recent years, polyethylene garbage collection bags used in local governments such as Tokyo have been replaced with opaque polyethylene garbage collection bags. At present, the use of translucent polyethylene garbage bags has become mandatory. However, conventionally, such a transparent or translucent polyethylene garbage collection bag originally uses a transparent polyethylene virgin pellet, and a transparent or translucent product is obtained by blending a coloring agent or the like with the virgin pellet. Was.

[0003]

On the other hand, a polyethylene film waste material consisting of a packaging film of a polyethylene resin material, a bag making loss of a packaging bag, a cut end of an inflation film, a printed polyethylene film film of a waste version, etc. The pellets are formed by heating and melting at a temperature of 170 to 200 ° C. with a molding machine such as an extruder, and then molded into polyethylene pipes or piles for construction or agriculture, for example, and reused. Therefore, as a result of diligent research conducted by the present inventors, the present inventors have found a method of recycling polyethylene film waste material that can effectively utilize the polyethylene film waste material and promote its recycling. It is intended to provide the garbage collection bags obtained by the above.

[0004]

The polyethylene-based translucent garbage collection bag of the present invention is obtained by heating and shaping pelletized polyethylene film waste material at 170 to 200 ° C. into pellets. Waste materials are blown with a blown film molding machine.
It is characterized by being formed into a film by heat molding at 10 ° C., and in particular, characterized in that the waste polyethylene film consists of a printed material.

As a specific method of processing the above-mentioned waste polyethylene film into a film, for example, a packaging film of a polyethylene resin material, a bag making loss of a packaging bag, a cut end of an inflation film, a waste plate, etc. Polyethylene film waste material such as polyethylene film printed matter is crushed, and formed into pellets by heating and molding at 170 to 200 ° C. by a molding machine such as an extruder.
This is blown with a blown film molding machine to 200-2.
It is formed by heating at 10 ° C. to form a film.

[0006] The polyethylene-based film waste material includes a polyethylene-based resin packaging film, a bag-making loss of a packaging bag, a cut end of an inflation film,
It can be appropriately selected from a waste version of a printed polyethylene film or the like. Particularly suitable in the present invention are waste polyethylene films that have been subjected to color printing in various colors.

[0007] That is, waste polyethylene film which has been subjected to color printing of various colors is heated and melted to 170 to 200 ° C by a molding machine such as an extruder and pelletized, and then 200 to 200 ° C by an inflation film molding machine. When the film was formed by heating at 210 ° C, the resulting film was gray and translucent and could be used in local governments such as Tokyo, and was fully used as a garbage collection bag. It was strong enough to withstand.

[0008] Raw materials such as polyethylene resin material packaging film, packaging bag making loss, cut end of inflation film, and waste polyethylene prints, etc., use different grades for each manufacturer. are doing. Therefore, it is possible to obtain a garbage collection bag having uniform quality and a stable color (gray) by mixing and using polyethylene film waste materials from as many manufacturers as possible.

Of course, it is possible to use a mixture of polyethylene pellets that are not regenerated with the pelletized polyethylene film waste, but it is desirable to use only the polyethylene film waste.

Then, the polyethylene film obtained by the above-mentioned method for recycling waste polyethylene film is cut into an appropriate size to form a garbage collection bag. Of course, this can be used as a packaging bag.

The garbage collection bag obtained as described above is
By performing printing specified by each local government such as Tokyo, it can be used as a designated transparent or opaque garbage collection bag. Of course, when used as a packaging bag, printing may be performed similarly.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the above-mentioned method for recycling polyethylene film waste and a garbage collection bag obtained by using the same will be described.

First, a method of recycling polyethylene film waste will be described. A large amount of polyethylene-based film waste material including a polyethylene-based resin packaging film, a bag-making loss of a packaging bag, a cut end portion of an inflation film, a printed version of a polyethylene-based film, and the like is constantly generated. This is accumulated and finely ground, and is extruded and formed into pellets by a molding machine such as an extruder at a heat molding temperature of 170 to 200 ° C. The polyethylene film waste material extruded into pellets is usually uniformly mixed without addition.

Then, this is heated and formed at a temperature of 200 to 210 ° C. by a blown film forming machine to form a polyethylene film. That is, the polyethylene film was molded at a heat molding temperature of 200 to 210 ° C. using a blown film molding machine having a screw diameter of 50 mmφ, a die diameter (outflow diameter of the molten resin) of 150 mmφ, and a resin extrusion amount per hour of about 30 kg. .

When the polyethylene film was formed under the above-mentioned conditions, the pellet-like polyethylene film waste was smoothly melted and uniformly mixed as a whole, and the obtained polyethylene film was dark gray translucent and had a high strength. Both the thickness and the thickness conformed to the standard conditions of the garbage collection bag specified by each local government such as Tokyo.

By setting the die diameter of the blown film molding machine to 150 mmφ, the blow
The ratio (inflated ratio) was 2.76, which facilitated film formation and obtained sufficient strength. That is, if the blow ratio is not 2.0 or more, the strength of the film in the vertical direction and the horizontal direction is poor, and the strength of the garbage collection bag is insufficient. On the other hand, if the blow ratio is 3.0 or more. This makes it difficult to form a film and makes the width dimension difficult to stabilize. In addition, low-density polyethylene or the like may be applied to the pellet-like polyethylene film waste material to improve the homogeneity of the film and eliminate uneven melting.

A 45-liter capacity garbage collection bag was formed from the extruded polyethylene film.
The thickness is 0.03 mm and the tensile strength is 20 in the longitudinal direction.
The weight was 7 kg / cm 2, and the lateral direction was 134 kg / cm 2.

[0018]

EXAMPLE A variety of polyethylene-based film waste materials were collected and pulverized into fine pieces, and heated at a temperature of 170 to 20.
It was extruded into pellets at 0 ° C. by a molding machine such as an extruder. The polyethylene-based waste film extruded into pellets was heated and molded at a temperature of 200 to 210 ° C. using an inflation film molding machine to obtain a polyethylene film. The polyethylene film was molded at a heat molding temperature of 200 to 210 ° C. using a blown film molding machine having a screw diameter of 50 mmφ, a die diameter (outflow diameter of the molten resin) of 150 mmφ, and a resin extrusion amount per hour of about 30 kg. . When a 45-liter capacity garbage collection bag was formed from the extruded polyethylene film, the thickness was 0.03 mm, the tensile strength was 207 kg / sq cm in the longitudinal direction and 134 kg / sq cm in the horizontal direction. It was well adapted to the conditions.

In the above description, an example was shown in which a polyethylene film was formed by using waste polyethylene film, thereby forming a garbage collection bag designated by each local government such as Tokyo. It is of course possible to form more packaging bags.

[0020]

Since the present invention has the above-described structure, the above-mentioned disadvantages of the prior art are solved and the following unique effects are obtained. a. In the past, polyethylene film waste, which was no longer needed and was mostly disposed of, could be reasonably molded into polyethylene films that could be recycled as garbage collection bags or packaging bags. Resources can be effectively used, which is beneficial in saving resources. b. Polyethylene film waste is formed into a polyethylene film at a predetermined heating molding temperature, thereby forming a garbage collection bag or a packaging bag. It is possible to manufacture a garbage collection bag or a packaging bag that can sufficiently satisfy the required standard conditions. c. At that time, almost all of the unnecessary polyethylene film waste material is used, which can contribute to a significant cost reduction of the translucent garbage collection bag or the packaging bag made of the polyethylene film.

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) B29L 7:00 B29L 7:00

Claims (3)

[Claims] 1. A translucent polyethylene-based garbage collection bag, wherein pelletized polyethylene film waste is formed into a film at a predetermined temperature by a film forming machine. 2. A pelletized polyethylene film waste material is heat-formed at 170 to 200 ° C. to form a pellet, and the pelletized polyethylene film waste material is heat-formed at 200 to 210 ° C. by an inflation film forming machine. A translucent garbage collection bag made of polyethylene. 3. The polyethylene-based translucent garbage collection bag according to claim 1, wherein the polyethylene-based film waste material is printed.