JPH07156148A - Classifying recovery treatment of synthetic resin laminate - Google Patents

Abstract

PURPOSE:To obtain two kinds of single layer fine piece aggregates corresponding to respective specific gravities in high recovery and high purity by successively applying coarse grinding treatment, impact grinding treatment and air classifying treatment to a synthetic resin laminate consisting of two kinds of single layers different in specific gravity. CONSTITUTION:As a synthetic resin laminate, for example, a laminate obtained by bonding a single layer 2 composed of PVC and a single layer 3 composed of polyurethane foam is used. In a first process, the laminate 1 is subjected to coarse grinding treatment to obtain aggregates 7 wherein both single layer ground pieces 5, 6 are bonded. In a second process, impact grinding treatment is applied to the aggregates 7 not only to divide both single layer ground pieces 5, 6 but also to finely grind the same to obtain mixed aggregates 10 consisting of two kinds of independent single layer fine pieces 8, 9. In a third process, the mixed aggregates 10 are allowed to fall to the classifying chamber 17 of an air classifier 16 to be classified into single layer fine pieces 8 high in specific gravity and single layer fine pieces 9 low in specific gravity by air streams A from a blower 19.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synthetic resin laminate, and more particularly to a method for separately collecting and treating a laminate composed of two types of single layers having different specific gravities.

[0002]

2. Description of the Related Art Conventionally, as a laminate of this type, for example, P
Single layer made of VC (polyvinyl chloride) (specific gravity 1.29-
1.41) and polyurethane foam (specific gravity 0.02-
There is known an automobile interior panel in which a single layer made of 0.04) is joined via an adhesive.

When disposing of this interior panel, it is desirable to separate and collect the individual layers for each layer in order to prevent pollution, to save resources, and to reuse the recovered material.

Therefore, as a method for separating and collecting the species,
A step of obtaining a hybrid aggregate composed of PVC single-layer strips and polyurethane foam single-layer strips by crushing the interior panel using a cutter mill, and performing a separation treatment using a difference in specific gravity on the hybrid aggregate to perform PVC single-slice A method has been developed in which the step of obtaining a layered small piece aggregate and a step of obtaining a polyurethane foam single layer small piece aggregate are sequentially performed (see Japanese Patent Laid-Open No. 3-30877).

[0005]

However, according to the conventional method, in the crushing process by the cutter mill, shearing between the PVC single-layer crushed pieces and the polyurethane foam single-layer crushed pieces which are bonded to each other is uniformly performed over the entire interior panel crushed pieces. As a result, the collection of PVC single-layer strips contains a mixture of polyurethane foam single-layer strips, so that recovery P
There is a problem that the physical properties of VC are significantly inferior to those of synthetic PVC.

[0006] In view of the above, the present invention has the above-mentioned recovery processing method by incorporating a collision pulverization processing step so that two kinds of single-layer small-sized aggregates corresponding to each specific gravity can be obtained with a high recovery rate and a high purity. The purpose is to provide.

[0007]

A method for separating and recovering a synthetic resin laminate according to the present invention comprises subjecting a synthetic resin laminate composed of two kinds of single layers having different specific gravities to coarse crushing treatment. The first step of obtaining an aggregate of laminated crushed pieces, and by subjecting the aggregate to a collision crushing process, the single crushed pieces of the laminated crushed pieces are separated from each other and the single layer crushed pieces are finely divided. The second step of obtaining a mixed aggregate consisting of two independent single-layer strips, and subjecting the mixed assembly to wind fractionation to obtain two single-layer strip aggregates corresponding to each specific gravity The third step is sequentially performed.

[0008]

The above-mentioned collision crushing treatment is a treatment in which an aggregate of laminated crushed pieces is struck on a fixing member at a high speed to give an impact force to the aggregate, whereby both single-layer crushed pieces joined to each other. It is possible to reliably separate the gaps, and each monolayer fragment is also miniaturized. By subjecting the mixed aggregate consisting of two independent single-layer small pieces obtained in this manner to the wind separation treatment, two types of single-layer small-piece aggregates can be obtained with a high recovery rate and high purity. it can.

[0009]

EXAMPLE First, a method for separating and collecting waste according to this example will be described.

As shown in FIG. 1A, the synthetic resin laminate 1 is, for example, PVC (specific gravity 1.29 to 1.4).
1), a relatively thin single layer 2 made of ABS (specific gravity 1.01 to 1.04) and the like, and a polyurethane foam (specific gravity 0.02).
~ 0.04), PP (polypropylene) foam (specific gravity 0.02 to 0.07), PEF (polyethylene foam,
A single layer 3 having a specific gravity of 0.053 to 0.061), which has a smaller specific gravity than PVC and has a relatively large thickness, is joined via a thermosetting synthetic resin adhesive such as a modified polyester adhesive. The object is the processing target.

As shown in FIG. 1 (b), in the first step, the laminate 1 is subjected to coarse crushing treatment using a cutter mill, and the crushed pieces 4 of the laminate, and thus the aggregates of both single-layer crushed pieces 5 and 6 joined together. Get Item 7. The size of the laminated shards 4 is 10 mm or less in both length and width, preferably 5 to 6 mm in length and width.

As shown in FIG. 1C, in the second step,
By subjecting the aggregate 7 to collision pulverization using a collision pulverizer, for example, a commercially available Ultraplex Cross Flow Mill (manufactured by Hosokawa Micron Co., Ltd.), the laminated pulverized fragments 4 are bonded to each other between the single-layer crushed pieces 5 and 6. And a monolithic crushed piece 5 and 6 which are divided into vertical and horizontal pieces each having a size of about 3 mm, and which are composed of two independent single-layered pieces 8 and 9 which are independent from each other.
To get

As shown in the schematic view of FIG. 2, the collision crusher M arranges the aggregate 7 supplied from the hopper 11 between an inner fan beater 12 and an outer fixed grinding track 13 which are coaxially arranged. 90 to 100 m / m in the plurality of grooves 14 on the inner peripheral surface of the grinding track 13 while feeding and rotating the crushed laminate 4 by the fan beater 12.
It has a function of hitting at a high speed of sec, simultaneously making the laminated crushed pieces 4 collide with each other at a similar high speed, and discharging the obtained mixed aggregate 10 downward through the screen 15. In this case, since a large amount of air is sucked and discharged by the fan beater 12, the laminated crushed pieces 4 are efficiently cooled, and the temperature of the laminated crushed pieces 4 during collision crushing is maintained at 51 ° C. or lower. Therefore, there is no change in the physical properties of the crushed laminate 4.
Incidentally, the processing temperature during vacuum forming of the synthetic resin laminate 1 is about 180 ° C.

As shown in FIG. 1D, in the third step,
In the wind power separation processing, the mixed assembly 10 is moved to the wind power separation machine 16
It is dropped through the hopper 18 into the sorting chamber 17 of. In the separation chamber 17, since the air flow A toward the exhaust port 20 on the upper side of the other side wall is formed by the blower 19 in the middle part of the one side wall, the single-layer strip 8 having a large specific gravity is directed to the air flow direction of the air flow A. The single layer strip 9 having a small specific gravity is collected in the second storage tank 22 on the front side in the flow direction by being dropped into the first storage tank 21 on the rear side.
It falls and is collected. As a result, two types of single-layer thin piece aggregates 23 and 24 corresponding to each specific gravity are obtained with a high recovery rate and a high purity.

In the first step, a primary coarse pulverization treatment and a secondary coarse pulverization treatment subsequent to the primary coarse pulverization treatment may be performed in order to efficiently make the crushed pieces 4 of the laminate. In this case, the size of the crushed laminate 4 is about 15 mm in both length and width in the primary coarse crushing process and 5 to 6 mm in both length and width in the secondary coarse crushing process.

After the secondary coarse crushing process, as shown in FIG. 3, the aggregate 7 is mixed with coarse crushed pieces 25 generated from the single-layer crushed pieces 6 having a small specific gravity as the laminated crushed pieces 4 are made into small pieces. . The coarsely crushed pieces 25 include 25 ₁ having the same composition as the single-layer crushed pieces 6 having a small specific gravity and 25 ₂ having a part 8a of the single-layer crushed pieces 8 having a large specific gravity.

Since such coarsely crushed pieces 25 do not require or cannot be divided by the collision crushing process, if these coarsely crushed pieces 25 are mixed in the aggregate 7, the next collision crushing is performed. It becomes a cause of hindering the cutting efficiency of the crushed laminate 4 in the processing.

In removing these coarsely crushed pieces 25, the aggregate 7 is subjected to the same wind classification treatment as described above by utilizing the fact that their specific gravity is smaller than that of the laminated crushed pieces 4.

Next, a specific example will be described.

As a synthetic resin laminate, trimming scraps 1 produced in the process of manufacturing an automobile instrument panel were prepared. This trimming waste 1 is made of PVC (specific gravity 1.2
9 to 1.41) and a 0.9 mm thick single layer 2 and PE
A single layer 3 having a thickness of 4 mm and made of F (specific gravity 0.053 to 0.061) is joined via a modified polyester adhesive, and the trimming waste 1 has a PVC ratio of 8
The ratio of 2% by weight and PEF is 18% by weight.

Using the trimming waste 1, the first and second coarse crushing processes and the first process including the air separation process, the second process including the collision crushing process, and the third process including the separation process are sequentially performed to obtain a PVC single product. A layer strip assembly 23 and a PEF single layer strip assembly 24 were obtained.

The recovery rate of the PVC single-layer strips 23 was about 99% (ratio 81.2% by weight), and almost no PEF component and adhesive component adhered to each PVC single-layer strip 8. The purity was 99%, and it was found to be reusable. The recovery rate of the PEF single-layer small piece aggregate 24 was about 99% (ratio 17.8% by weight), and almost no PVC component or adhesive component was found on each PEF single-layer small piece 9. It was found to have a purity of 99% and can be reused similarly to the PVC single-layer strip assembly 23.

Next, in order to investigate the performance of the PVC single-layer thin piece assembly 23, the assembly 23 was kneaded for 15 minutes by using a two-roll machine, and the kneaded material was used to measure length 600 mm, width 3
A test piece having a thickness of 00 mm and a thickness of 0.4 mm was manufactured. This test piece was used as a recovered material test piece, and the specific gravity of this test piece was 100
When the% modulus, tensile strength, elongation and tear strength were measured, the results in Table 1 were obtained. In Table 1, the synthetic material test piece was manufactured using synthetic PVC.

[0024]

[Table 1] As is apparent from Table 1, the physical properties of the recovered material test piece using the PVC single-layer strip assembly 23 according to this example are similar to those of the synthetic material test piece, and thus the assembly 2 is used.
It can be seen that 3 is extremely effective as a recycled material.

[0025]

According to the present invention, the specific gravity is changed by sequentially using the first step of performing the coarse crushing process, the second step of performing the collision crushing process, and the third step of performing the wind force classification process as described above. It is possible to obtain two kinds of single-layer small and small pieces aggregates corresponding to each specific gravity with high purity and high recovery rate from the synthetic resin laminate composed of two kinds of single layers. This is effective in reusing things.

[Brief description of drawings]

FIG. 1 is a schematic explanatory view of a method of separate collection processing.

FIG. 2 is a cross-sectional view of an essential part showing an example of a collision crusher.

FIG. 3 is an explanatory diagram of a laminated crushed piece aggregate after the secondary coarse crushing process.

[Explanation of symbols]

 1 Synthetic resin laminate 2,3 Single layer 4 Laminate crushed piece 5,6 Single layer crushed piece 7 Aggregation 8,9 Single layer fine small piece 10 Mixed aggregate 23,24 Single layer small small piece aggregate 25 Coarse crushed piece

Claims (3)

[Claims] 1. A synthetic resin laminate (1) composed of two types of single layers (2, 3) having different specific gravities is subjected to coarse pulverization to obtain an aggregate (7) of laminate fragments (4). ) Is obtained, and the aggregate (7) is subjected to collision crushing treatment so as to separate the single-layer crushed pieces (5, 6) of the laminated crushed pieces (4) from each other and to divide them. Single layer debris (5
6) Miniaturized and independent two types of single layer strips (8, 9)
The second step of obtaining the mixed aggregate (10) consisting of the above and the wind aggregation treatment of the mixed aggregate (10) to obtain two kinds of single-layer strips (23, 24) corresponding to each specific gravity. Third
A method for separating and collecting a synthetic resin laminate, which comprises sequentially performing the steps. 2. The method for separating and recovering a synthetic resin laminate according to claim 1, wherein the first step comprises a primary coarse pulverization treatment and a secondary coarse pulverization treatment subsequent thereto. 3. In the first step, the aggregate (7) after the secondary coarse pulverization treatment is subjected to a wind force classification treatment, and is mixed with the aggregate (7) to form the laminated crushed pieces (4). The method for separating and collecting a synthetic resin laminate according to claim 2, wherein the coarsely crushed pieces (25) having a smaller specific gravity than the aggregate (7) are removed.