Polyethylene-based resin foam particle molded article and method for manufacturing the same

Abstract

To provide a method for producing a polyethylene-based resin foam particle molded body capable of obtaining a foam particle molded body having a desired shape and excellent appearance and rigidity, even though the time required for the curing process is reduced.SOLUTION: There is provided a method for producing a foam particle molded body, wherein a mold is filled with cylindrical foam particles (1) having through holes, and a heating medium is supplied to fuse the foam particles (1) to each other, thereby producing a foam particle molded body. The foam particles (1) each have a foam layer that is configured from a polyethylene-based resin. The closed cell ratio of the foam particles (1) is 80% or more. The average diameter (d) of the through holes (11) in the foam particles (1) is less than 1 mm. The ratio (d / D) of the average diameter (d) to the average outer diameter (D) of the foam particles is 0.4 or less. The open cell ratio of the foam particle molded body is 8% or more and 20% or less.SELECTED DRAWING: Figure 1

Claims

1. A method for producing a polyethylene resin foam particle molded body, comprising filling a mold with cylindrical polyethylene resin foam particles having through holes, supplying a heating medium to fuse the foam particles together, The foamed particles have a foamed layer made of polyethylene resin, The closed-cell ratio of the foamed particles is 80% or more. The average pore diameter d of the through-holes in the foamed particles is less than 1 mm, and the ratio of the average pore diameter d to the average outer diameter D of the foamed particles [d / D] is 0.4 or less. A method for producing a polyethylene-based resin foam particle molded article, wherein the open bubble ratio of the molded article is 8% or more and 20% or less.

2. A method for producing a polyethylene-based resin foam particle molded article according to claim 1, wherein the internal pressure of the foam particles filled in the mold is 0 MPa(G) or more and 0.3 MPa(G) or less.

3. A method for producing a polyethylene resin foam particle molded article according to claim 2, wherein the internal pressure of the foam particles filled in the mold is 0.02 MPa(G) or more and 0.3 MPa(G) or less.

4. A method for manufacturing a polyethylene resin foam particle molded article according to any one of claims 1 to 3, wherein the foam particles have a coating layer that covers the foam layer, the coating layer is made of a polyethylene resin, and the melting point of the polyethylene resin constituting the coating layer is lower than the melting point of the polyethylene resin constituting the foam layer.

5. A method for producing a polyethylene resin foam particle molded article according to any one of claims 1 to 3, wherein the foam particles have a coating layer covering the foam layer, the coating layer is made of a polyethylene resin, and the melt mass flow rate of the polyethylene resin constituting the coating layer, measured at 190°C and a load of 2.16 kg, is 8 g / 10 min or more and 30 g / 10 min or less.

6. A method for producing a polyethylene resin foam particle molded article according to any one of claims 1 to 3, wherein the foam particles have a coating layer that covers the foam layer, the coating layer contains a polymer-type antistatic agent, and the amount of the polymer-type antistatic agent in the coating layer is 10% by mass or more and 45% by mass or less.

7. A method for producing a polyethylene resin foam particle molded article according to any one of claims 1 to 3, wherein the average wall thickness t of the foam particles, expressed by the following formula (1) using the average outer diameter D and the average pore diameter d, is 1.2 mm or more and 3 mm or less. t=(D-d) / 2...(1)

8. The density of the molded body is 10 kg / m³. 3 More than 100kg / m 3 The method for producing a polyethylene-based resin foam particle molded article according to any one of claims 1 to 3, as follows:

9. A polyethylene resin foam particle molded body in which cylindrical polyethylene resin foam particles having through holes are fused together, The closed-cell ratio of the molded body is 80% or more. A polyethylene-based resin foam particle molded article having an open air bubble ratio of 8% or more and 20% or less.

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