KR100266290B1 - Recyling method of package cushiaring materal, and mixed recycled pellets and extrusions including thereof - Google Patents

Abstract

PURPOSE: A method of reproducing a buffering material is provided to prevent environmental contamination by reproducing foamed polyethylene, polystyrene copolymers and waste polystyrene foams used as buffering materials for package into injection resins. CONSTITUTION: Waste polyethylene foams and waste foamed PE+PS copolymers are made into reproduced polystyrene pallets(70) and reproduced PE+PS pallets(80) through a crushing step(30), a melting step(40), an ingot forming step(50), an extruding step(60) and pallet cutting steps(70,80). The reproduced polystyrene pallets(70), the reproduced PE+PS pallets(80) and HIPS pallets(90) are inputted and mixed with a ratio of 30%:30%:40% in mixing step(100). The mixed pallets(70,80,90) are made into reproduced pallet mixture(120) through an extruding step(110). The reproduced pallet mixture(120) is injected as components(140) through an injection step(130) to be supplied to a manufacturer.

Description

Recycling method for packaging cushioning materials, mixed regeneration pellets and injection molded products

The present invention relates to a method for regenerating a packaging cushioning material, mixed regenerated pellets, and an injection-molded product including the same, and more particularly, for injection of a foamed polyethylene + polystyrene (PE + PS) copolymer foam and a foamed polystyrene foam used as a packaging buffer. The present invention relates to a regeneration method of a packaging cushioning material that is recycled with a resin, a mixed regeneration pellet, and an injection molded product including the same.

At the time of serious environmental pollution and growing interest in the environment, synthetic resin-based packaging buffers used only for transportation, such as expanded polystyrene (PS) foam and expanded polyethylene + polystyrene (PE + PS) copolymer foam, etc. Disposal is a serious problem. These packaging cushions are also bulkier than conventional plastic waste and are increasingly used. Conventionally, such packing cushions have been disposed of by incineration or landfill, but all of these disposal methods cause environmental pollution, and new disposal methods are urgently required.

It is known to collect, remelt and recycle plastic waste back into plastic products.

In addition, a method of recycling foam polystyrene foam, which is used as a packing material for packaging, from a recycling company and mixing it with new high polystyrene (HIPS), and regenerating it into a material such as a picture frame and a window frame is known. However, these regenerated polystyrene resins are vulnerable in terms of physical properties and have problems such as peeling phenomenon.

Recently, the foamed PE + PS copolymer foam has better physical properties such as impact absorption, toughness, and durability against repeated loads than the existing foamed polystyrene buffer, and the packaging volume is reduced when used as a packaging buffer to reduce logistics costs. As a result, the amount of foamed PE + PS copolymer foam is continuously increasing. However, no method for regenerating foamed PE + PS copolymer foam has been developed.

The reason why the regeneration method for the PE + PS copolymer foam has not been developed has been dominantly recognized that conventionally, PE and PS series resins cannot be mixed. Also, for the expanded PE + PS copolymer foam, the expanded polystyrene foam As was the case, it was generally due to the recognition that the regenerated product of the packaging cushioning material in the form of foam would not have good physical properties.

Accordingly, the present invention has been made to solve the above problems, and an object of the present invention is to provide a method for regenerating a cushioning material for packaging.

It is an object of the present invention to provide a process for the regeneration of a packaging cushioning material comprising in particular a foamed PE + PS copolymer foam.

It is also an object of the present invention to provide a mixed regenerated pellet recycled by a regeneration method of a packaging cushioning material comprising a foamed PE + PS copolymer foam and an injection molded product comprising the same.

Regeneration method of the packaging cushioning material of the present invention made to achieve the above object, the process of regenerating the waste foamed polystyrene (PS) foam to the regeneration PS pellets, and recycling the waste foamed PE + PS copolymer foam to the regeneration PE + PS pellets And a mixing step of mixing the recycled PS pellets, recycled PE + PS pellets and new HIPS pellets at a predetermined ratio, an extrusion process of extruding the mixed pellets into mixed recycled pellets, and mixing the extrusion extruded in the extrusion process. It is characterized by consisting of a pellet cutting process for cutting the recycled pellet to a certain size.

1 is a recycle flow of a packaging cushioning material according to the present invention.

Explanation of symbols on the main parts of the drawings

10 separation process 20 regeneration process

30: grinding step 40: melting step

50: ingot forming process 60: extrusion process

70: recycled polystyrene pellets 80: recycled PE + PS pellets

90: new HIPS pellet 100: mixing process

110: extrusion process 120: mixed recycle pellet

130 injection molding 140 functional parts

150: drying process

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

The present invention, as shown in Figure 1, after the product is delivered to the user after packaging the product using a synthetic resin buffer for the purpose of preventing the product from damage during transportation, the manufacturer separates the synthetic resin buffer from the product and discarded do.

At this time, the recycling company collects the discarded synthetic resin buffer, and separates each of the paper, vinyl, waste foam polystyrene foam, waste foam PE + PS copolymer foam according to the material separation process (10).

Thereafter, the waste foamed polystyrene foam and the waste foamed PE + PS copolymer foam are respectively pulverized in accordance with the regeneration process 20, melting process 40, ingot forming process 50, extrusion process 60 and By working through the pellet cutting process (70, 80) sequentially it is made of recycled polystyrene pellets 70 and recycled PE + PS pellets 80, respectively.

Then, regenerated polystyrene pellets 70, regenerated PE + PS pellets 80 and new HIPS pellets 90 were added to the mixing process 100 at a mixing ratio of 30%: 30%: 40% as shown in Table 1. After the mixing process 100 is completed, the mixing regeneration pellet 120 is made through the extrusion process 110, and the mixed regeneration pellet 120 is injected into the injection process 130 to produce the functional component 140 of the product. ) And supply it to the manufacturer.

At this time, it is preferable that the buffer material separated in the separation step 10 passes through the drying step 150 to remove moisture, and then is introduced into the regeneration step 20.

In order to maintain uniform physical properties when mixing the regenerated polystyrene pellets 70, regenerated PE + PS pellets 80 and new HIPS pellets 90 in the mixing process 100, these pellets 70, 80, 90 It is preferable to mix them in similar sizes.

In addition, when mixing the recycled polystyrene pellets 70, recycled PE + PS pellets 80, and new HIPS pellets 90 in the mixing step 100, a suitable pigment (e.g., titanium, carbon or A mixture of these) may be added to color in various concentrations from white to black.

In the injection process 130, in order to prevent combustion of the mixed regenerated pellet 120, the mixed regenerated pellet 120 is injected under the conditions of 160-200 ° C or less to prevent discoloration.

When recycled polystyrene pellets, recycled PE + PS pellets, and new HIPS pellets are produced in the functional part 140 by the proper ratio by the regeneration method of the present invention, the regenerated products are conventional ABS or new materials as shown in Table 1 below. It will appear similar to the properties of HIPS. The physical properties of such regenerated products are much superior to those of conventional regenerated polystyrene. This excellent physical property is believed to be due to the PE component in the regenerated PS + PE resin.

Table 1

Test Items unit Buffer Reclaimed Resin for Packaging ABS (VH-0810) New HIPS (HR-1360) Recycled PS pellet: Recycled PE + PS pellet: Mixing ratio of new HIPS pellet 2: 4: 4 3: 3: 4 1: 4: 5 Shin Jae Shin Jae Tensile strength (TS) ㎏ / ㎠ 324 323 303 420 320 Flexural Strength (FS) ㎏ / ㎠ 408.2 414.9 388.5 600 360 Flexural Modulus (FM) ㎏ / ㎠ 18,720 19,790 16,900 24,000 17,600 Elongation (ER) % 47 47 58 - - Impact strength 3.2 mm Kgcm / cm 5.75 5.15 6.7 19 10 6.4 mm Kgcm / cm 4.3 4.1 4.8 - - Melt Index (MI) g / 10min 10.48 13.65 9.33 5.5 3.8 Heat Deflection Temperature (HDT) ℃ 77.1 80.0 78.2 76 78 Hardness R 99.3 102.5 96.4 100 112

This test standard is the physical property value obtained by ASTM (American standard).

As described above, the method for regenerating the packaging buffer according to the present invention, mixed regenerated pellets, and injection-molded products including the same include mixing regenerated polystyrene pellets, regenerated PE + PS pellets, and new HIPS pellets at an appropriate ratio to produce mixed regenerated pellets. Since it can be used as a raw material for functional parts, it is possible to reduce the environmental pollution by suppressing the disposal of incineration or landfilling, as well as to provide raw materials for new functional parts.

Claims (10)

Recycling waste foamed polystyrene foam into regenerated polystyrene pellets, A regeneration process of regenerating the waste foamed PE + PS copolymer foam into regenerated PE + PS pellets; A mixing step of mixing the regenerated polystyrene pellets, regenerated PE + PS pellets, and new HIPS pellets at a predetermined ratio; An extrusion process of extruding the mixed pellets into a mixed regeneration resin; Recycling method of the packaging buffer material, characterized in that consisting of a pellet cutting process for cutting the mixed recycled resin extruded in the extrusion process to a predetermined size. The method of claim 1, The waste foamed polystyrene foam and the waste foamed PE + PS copolymer foam is passed through a drying process so that there is no moisture before being introduced into the regeneration process. The method of claim 1, The reclaimed polystyrene pellets, reclaimed PE + PS pellets, and new HIPS pellets are sized substantially similar to each other to maintain uniform physical properties when mixing in the mixing step. The method of claim 1, The recycled polystyrene pellets: recycled PE + PS pellets: new HIPS pellets mixing ratio of 10-40%: 30-40%: 40-50% regeneration method of the packaging buffer, characterized in that. The method of claim 1, The regeneration process is a recycling method of the packaging cushioning material, characterized in that in the order of the grinding step, the melting step, the ingot forming step, the extrusion step, and the pellet cutting step. The method of claim 1, In the mixing process, when the regenerated polystyrene pellets, regenerated PE + PS pellets, new HIPS pellets are mixed and injected, a suitable pigment is input to regenerate a suitable pigment to be colored at various concentrations from white to black. The method of claim 6, The pigment is a recycling method for the packaging cushioning material, characterized in that made of any one selected from titanium, carbon or a mixture thereof. A mixed regenerated pellet recycled by the method of any one of claims 1 to 7. An injection molded product comprising the mixed recycled pellet of claim 8 as a main component. The method of claim 9, The injection-molded product is characterized in that the injection molded under the conditions of 160-200 ℃ or less to prevent discoloration during injection.