JP2003048229A - Method for molding side ditch cover from used pet product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To mold a safe side ditch cover excellent in workability, strength and weatherability only from a regenerated raw material formed by recovering a used PET product and a used resin product other tan PET. SOLUTION: PET ground pieces 14 obtained by grinding the used PET product 12 and resin ground pieces 18 obtained by grinding a used resin product 16 molded from a plastic resin other than PET are mixed in a ratio of about (6:4) and dried to prepare the regenerated raw material 22 which is, in turn, charged in an injection molding machine 24 and injected in the retaining mold 38 for the side ditch cover arranged to the injection molding machine 24 at a molding temperature of 280-285 deg. to mold the side ditch cover 40.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for molding a gutter lid from a used product such as a PET bottle molded from PET (polyethylene terephthalate).

[0002]

2. Description of the Related Art In recent years, a recycle mark having a substantially triangular shape and a number 1 inside is printed on the outer peripheral surface of a container.
PET bottle for beverage formed by PET, and PP in which the number in the recycle mark is 2, 4 to 7
A large number of detergent containers and the like formed of (polypropylene), styrene, and the like have been found.

PET bottles for beverages whose number in the recycle mark is 1 are flexible and brittle.
Based on the material characteristics of, the material formed into a tubular shape by an injection mechanism, not an injection molding machine that performs molding by performing a series of operations of supplying material chips, heating plasticizing, injecting into a mold, cooling and solidifying, and carrying out a molded product. Is placed in a molding die, a gas, a liquid and the like are blown into the tubular material, and a blow molding machine is used to form a hollow product by the blowing pressure and the like.

[0004] Further, the PET bottle for beverage needs to be molded using new PET for the convenience of human beings to use for beverage, and the used PET bottle is collected by a collector, and the lid and the label are excluded. However, some of them are recycled fibers mixed with recycled materials and new materials,
Or, it is recycled as fuel, but most of it is simply incinerated as garbage, and it was never recycled to be a product.

The number in the recycle mark is 2,
4 to 7 used containers such as detergent containers are collected, the lid and label are removed and the recycled material is ground and mixed with a new material to form a recycled product with an injection molding machine, blow molding machine, etc. By doing so, a part is recycled.

Further, the product whose number in the recycle mark is 3 is not used recently because dioxin is generated during incineration and disposal since the raw material is vinyl chloride.

It is also known that a concrete gutter lid is arranged on a concrete gutter for draining water on the road.

[0008]

Conventionally, PET such as used PET bottles in which the number in the recycle mark is 1
The problem was that most of the products were incinerated and not recycled.

Further, even when recycled as fibers, it is not only the material recycled from the used PET product but also the new PET material mixed and recycled, and the product is recycled only from the recycled material. It was a problem that I could not do it.

There is also a strong demand for a method of recycling PET products such as used PET bottles that have been incinerated and then recycling them as new products.

Further, since the gutter lid arranged in the gutter for draining water on the road is made of concrete, not only the weight is heavy and the workability is poor, but also the strength and weather resistance are inferior. It was

Further, since the concrete gutter lid is inferior in strength and weather resistance, it is impossible to form a rib on the outer peripheral edge for improving the supporting force for the gutter.

Therefore, in the event of a flood due to heavy rain, etc., there is a risk that the concrete gutter lid will be blown up by the water pressure of a large amount of water overflowing from inside the gutter to the road, causing collision with a vehicle, a building, or people. There was a problem.

The present invention addresses such a demand and, in view of the above-mentioned drawbacks, only a recycled raw material produced by recovering a used PET product and a used resin product molded from a plastic resin other than PET is produced. An object of the present invention is to provide a method for forming a gutter lid with a used PET product, which is safe, and is capable of forming a gutter lid having excellent workability, strength, and weather resistance.

[0015]

The present invention relates to a used PET.
Injection molding machine using recycled raw material obtained by mixing and drying PET crushed pieces obtained by crushing products and resin crushed pieces obtained by crushing used resin products formed of plastic resin other than PET at a ratio of about 6: 4. The heating cylinder of the injection molding machine is set to a high temperature in the middle part and low temperature at both ends, and the molding temperature is set to the injection molding machine within a range of 280 to 285 degrees higher than the melting point of PET. It is characterized in that it is injected into the formed gutter lid mold to form a gutter lid, and a gutter lid mainly having ribs integrally formed on the side peripheral edge is molded.

[0016]

DETAILED DESCRIPTION OF THE INVENTION A method for molding a gutter lid from a used PET product according to the present invention will be described in detail below with reference to FIGS.

First, a PET crushed piece 14 obtained by crushing a PET bottle, which is the collected used PET product 12, and a collected plastic resin other than PET, a used resin product 16, which is a molded resin product mainly made of polypropylene, as a detergent. A crushed resin piece 18 obtained by crushing the container is prepared.

In the present example, the PET cover obtained by collecting the used PET product 12, that is, the PET bottle, which is fixed to the upper end of the plastic bottle, the resin portion around the upper end, and the label attached to the outer periphery are also crushed at the same time. It can be used as the crushed piece 14.

Further, the resin lid fixed to the upper end of the detergent container which is the recovered used resin product 16, the resin portion around the upper edge portion, and the label attached to the outer periphery are simultaneously pulverized to obtain resin pulverized pieces. It can be used as 18.

The PET crushed pieces 14 and the resin crushed pieces 18 do not need to be pelletized, and their size is 5 m.
It may be m or less, and about 3 mm is optimal.

Next, the PET crushed pieces 14 and the resin crushed pieces 1
8 and 8 are dried and agitated and mixed by a mixer 20 at a ratio of about 6: 4 to produce a recycled raw material 22.

Mixing the PET crushed pieces 14 and the resin crushed pieces 18 assists the material characteristics of the PET crushed pieces 14, such as flexibility and brittleness, by the high strength which is the material characteristic of the resin crushed pieces 18. At the same time, the used PET product 12 and the used resin product 16 are recycled at the same time.

This mixing ratio is a ratio at which the quality of the injection-molded product becomes good, and if it is other than this ratio, the product quality remarkably deteriorates.

Further, the crushed pieces 14 and 18 may be sufficiently dried in advance by a dryer (not shown) or the like before stirring and mixing.

Next, the recycled raw material 22 is put into the injection molding machine 24.

In this example, the injection molding machine 24 is an injection molding mechanism that has been used for a long time, and its outline will be briefly described below.

An injection nozzle 30 is provided at one end of a heating cylinder 28 in which an injection screw 26 is inserted, and a hopper 32 for introducing a material is provided at the other end. A plurality of heaters 34, 35 are provided on the outer peripheral surface of the heating cylinder 28. , 36, 37 are wound.

In this example, the heaters 34, 35, 3
6, 37 are wound around at least four places of the heating cylinder 28, and the heaters 34, 35, 36, 37 are connected to PEs.
The temperature is individually adjusted within the range of 280 degrees to 285 degrees higher than the melting point of T, and the heaters 34 and 37 at both ends of the heating cylinder 28 are adjusted.
Is set to 280 degrees (low temperature), and the heaters 35 and 36 in the middle part of the heating cylinder 28 are set to 285 degrees (high temperature).

The upper limit temperature of the middle portion (high temperature portion) of the heating cylinder 28 is set to 285 degrees in order to reduce energy consumption, and the lower limit temperature of both ends (low temperature portion) of the heating cylinder 28 is set to 280 degrees. The reason is to take into account that the melting point (about 250 ° C.) varies depending on the composition of the PET, and to perform good and reliable injection molding.

Next, the regenerated raw material 22 is melted in the heating cylinder 28 of the injection molding machine 24, and is injected from the injection nozzle 30 into the gutter lid frame 38 installed in the injection molding machine 24 to be used for the gutter lid. The gutter cover 40 shown in FIGS. 3 to 5 is molded by cooling and solidifying in the mold 38 and removing the gutter cover mold 38 from the mold.

At this time, the injection nozzle 30 of the injection molding machine 24
The injection pressure of the recycled material 22 injected from the mold is adjusted according to the size of the gutter lid 40 molded by the gutter lid mold 38.

Further, the gutter lid mold frame 38 is provided with a rib forming portion (not shown) for integrally forming a rib 42 for improving the supporting force on the gutter on the outer peripheral edge of the gutter lid 40 to be formed.
Is provided.

Thus, according to the present invention, the used PE
A new product can be molded using only the T product 12 and the used resin product 16, and by heating both ends of the heating cylinder 28 of the injection molding machine 24 at a low temperature and heating the middle part at a high temperature, a recycled raw material can be obtained. The PET crushed pieces 14 and the resin crushed pieces 18 of 22 are reliably and uniformly melted, and the product quality can be improved.

Further, since the molded gutter lid 40 is lightweight, it is possible to remarkably improve workability, and further, it is excellent in strength and weather resistance.

Further, the ribs 4 are easily formed on the outer peripheral edge of the gutter lid 40.
2 can be formed, and the rib 42 improves the supporting force to the gutter, and the gutter lid 40 is not blown up from the inside of the gutter at the time of flood, and is blown up to collide with a vehicle, a building, or a person. But there is no danger.

In the figure, 44 is a crusher and 46 is a mixer 2.
The 0 heater section is shown.

In this example, the used PET product 12 is not limited to PET bottles, and the used resin product 16 is not limited to polypropylene. Styrene or other resin other than PET should be used. Is self-evident.

The heater 3 wound around the heating cylinder 28
4, 35, 36, and 37 are four places, but it is obvious that the number is five or more.

Further, it is free to form a drain hole in the gutter lid 40.

In the present invention, the used PET product and the used resin product other than PET are recycled to form the gutter lid, but it is obvious that the gutter lid may be replaced with a sewer lid or a manhole lid. is there.

[0041]

According to the method for molding a gutter lid with a used PET product according to the present invention, a crushed piece of a used PET product and a crushed piece of a used resin product molded with a plastic resin other than PET, Recycled raw material obtained by mixing and drying at a ratio of about 6: 4 is put into an injection molding machine and injected into a gutter lid mold installed in the injection molding machine to mold the gutter lid. New products can be molded (recycled) using only PET products and used resin products.

Further, the molding temperature is higher than the melting point of PET 2
Within the range of 80 degrees to 285 degrees, the heating cylinder of the injection molding machine,
By setting the middle part to have a high temperature and the both ends to have a low temperature, the PET crushed pieces and the resin crushed pieces that are the regenerated raw materials are reliably and uniformly melted, and the product quality can be improved.

Further, since the molded gutter lid is lighter in weight than conventional concrete products, workability can be remarkably improved, and further strength and weather resistance are excellent.

Further, by forming ribs on the outer peripheral edge of the gutter lid, which is impossible to form concrete by nature, the supporting force for the gutter is improved, and the gutter lid is blown up from the inside of the gutter during flood. No accident, and there is no danger of being blown up and hitting a vehicle, building, or person.

[Brief description of drawings]

FIG. 1 is a simplified front view showing a molding process of a gutter lid using a used PET product of the present invention.

FIG. 2 is an enlarged vertical sectional view showing a heating cylinder of the injection molding machine.

FIG. 3 is a front view of a gutter lid.

FIG. 4 is a rear view of the gutter lid.

5 is a cross-sectional view taken along the line AA of FIG.

[Explanation of symbols]

12 Used PET products 14 PET crushed pieces 16 Used resin products 18 Resin crushed pieces 22 Recycled raw materials 24 injection molding machine 28 heating cylinder 34,35,36,37 heater 38 Gutter lid formwork 40 gutter lid 42 ribs

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) B29L 31:10 B29L 31:10

Claims (2)

[Claims] 1. A PET obtained by crushing a used PET product (12).
Crushed pieces (14) and resin crushed pieces (18) obtained by crushing a used resin product (16) molded from a plastic resin other than PET
And a recycled material (2:
2) is put into the injection molding machine (24), and the molding temperature is higher than the melting point of PET within the range of 280 ° C to 285 ° C.
The heating cylinder (28) of (24) has its middle part set to a high temperature and both ends set to a low temperature, and the gutter lid formwork installed in the injection molding machine (24).
A method for molding a gutter lid with a used PET product, which comprises injecting into the (38) and molding the gutter lid (40). 2. The used PET according to claim 1, wherein ribs (42) are integrally formed on the outer peripheral edge of the gutter lid (40).
Molding method for gutter lid by product.