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KR-20260062975-A - Method for manufacturing sheet-like extruded products

KR20260062975AKR 20260062975 AKR20260062975 AKR 20260062975AKR-20260062975-A

Abstract

The object of the present disclosure is to provide a method for manufacturing a sheet-like extruded article that suppresses wear on the extrusion molding machine, improves the moldability of the thermoplastic resin composition, and enables the production of a sheet-like extruded article having a small coefficient of linear expansion. The method for manufacturing a sheet-like extruded article involves kneading a thermoplastic resin composition and then extruding it from a mold to form it. The thermoplastic resin composition contains a thermoplastic resin and a filler. The thermoplastic resin comprises polypropylene having an MFR of 20 g/10 min or more and 60 g/10 min or less at a temperature of 230°C and a load of 2.16 kgf. The filler comprises wood flour and talc. The content of the filler is 60 parts by mass or more and 72 parts by mass or less per 100 parts by mass of the total of the thermoplastic resin and the filler. The content of the wood flour is 20 parts by mass or more and 70 parts by mass or less per 100 parts by mass of the total of the filler.

Inventors

  • 와타나베 고이티

Assignees

  • 파나소닉 하우징 솔루션즈 주식회사

Dates

Publication Date
20260507
Application Date
20240927
Priority Date
20231129

Claims (4)

  1. A method for manufacturing a sheet-like extruded product by mixing a thermoplastic resin composition and then extruding it from a mold to form it, The above thermoplastic resin composition contains a thermoplastic resin and a filler, and The above thermoplastic resin comprises polypropylene having an MFR of 20 g/10 min or more and 60 g/10 min or less at a temperature of 230°C and a load of 2.16 kgf, and The above filler includes wood flour and talc, and The content of the above filler is 60 parts by mass or more and 72 parts by mass or less, based on 100 parts by mass of the total of the thermoplastic resin and the filler, and The content of the wood flour is 20 parts by mass or more and 70 parts by mass or less, based on a total of 100 parts by mass of the filler. Method for manufacturing a sheet-like extruded product.
  2. In paragraph 1, The above filler additionally includes mica, and The content of the mica is 10 parts by mass or less with respect to 100 parts by mass of the total of the thermoplastic resin and the filler, Method for manufacturing a sheet-like extruded product.
  3. In paragraph 1, The content of the wood flour is 40 parts by mass or more and 70 parts by mass or less, based on a total of 100 parts by mass of the filler. Method for manufacturing a sheet-like extruded product.
  4. In any one of paragraphs 1 through 3, The above wood powder includes wood powder that passes through a 60-mesh sieve, Method for manufacturing a sheet-like extruded product.

Description

Method for manufacturing sheet-like extruded products The present disclosure relates to a method for manufacturing a sheet-like extruded article. Patent Document 1 discloses a resin composition containing an inorganic filler. This inorganic filler-containing resin composition contains a thermoplastic resin and an inorganic filler. Additionally, wood flour is incorporated into the inorganic filler-containing resin composition. Furthermore, the content of the inorganic filler is 40 mass% or more with respect to the total amount of the inorganic filler-containing resin composition. When using the extrusion molding method with the inorganic filler-containing resin composition of Patent Document 1, there was a problem that the extrusion molding machine was prone to wear. In addition, if the composition of the inorganic filler-containing resin composition is re-examined to suppress the wear of the extrusion molding machine, there is a concern that the moldability of the inorganic filler-containing resin composition may be reduced or the coefficient of linear expansion of the molded product may increase. The object of the present disclosure is to provide a method for manufacturing a sheet-like extruded article that suppresses wear on the extrusion molding machine, improves the moldability of the thermoplastic resin composition, and enables the production of a sheet-like extruded article having a small coefficient of linear expansion. In a method for manufacturing a sheet-like extruded article according to one aspect of the present disclosure, a thermoplastic resin composition is kneaded and then extruded from a mold to form the product. The thermoplastic resin composition contains a thermoplastic resin and a filler. The thermoplastic resin comprises polypropylene having an MFR of 20 g/10 min or more and 60 g/10 min or less at a temperature of 230°C and a load of 2.16 kgf. The filler comprises wood flour and talc. The content of the filler is 60 parts by mass or more and 72 parts by mass or less with respect to 100 parts by mass of the total of the thermoplastic resin and the filler. The content of the wood flour is 20 parts by mass or more and 70 parts by mass or less with respect to 100 parts by mass of the total of the filler. 1. Overview Generally, when using the extrusion molding method, an extrusion molding machine is utilized. The extrusion molding machine is equipped, for example, with an extruder, a gear pump, a mold, a cooler, a take-up machine, and a cutter. Here, examples of extruders include a single-screw extruder with one screw and a twin-screw extruder with two screws. Twin-screw extruders include twin-screw co-extruders and twin-screw bidirectional extruders. The gear pump is positioned between the extruder and the mold. The gear pump is a pump that transfers molten resin from the extruder to the mold using the meshing of gears. The mold is, specifically, a die. The die is a die mounted on a gear pump. In this embodiment, for example, a T-die (hanger die) is used. By doing so, molten resin can be extruded into a sheet. The cooler cools and solidifies the resin extruded in the form of a sheet. In this embodiment, for example, a cooling roll such as a three-roll type is used. The taker takes the solidified, elongated sheet-shaped extruded product. At this time, a decorative sheet may be applied after corona treatment is performed on the surface of the sheet-shaped extruded product. Examples of decorative sheets may include those printed with a wood grain pattern or a stone grain pattern. A cutting machine cuts the drawn-out, long sheet-shaped extruded product (including those with a decorative sheet attached) to a predetermined length. The sheet-shaped extruded product obtained in this way is used, for example, as flooring material. Here, when manufacturing a sheet-like extruded product, if the inorganic filler-containing resin composition of Patent Document 1 is used, there is a risk that the screw of the extruder or the gear of the gear pump may wear out. As such, if the extruder wears out, it becomes difficult to stably manufacture the sheet-like extruded product, so parts such as screws and gears must be replaced regularly with a span of several months to half a year. Consequently, running costs such as maintenance costs increase. Therefore, the inventors investigated the causes of wear in an extrusion molding machine in order to suppress it. As a result, regarding the inorganic filler-containing resin composition of Patent Document 1, it was estimated that one of the causes of wear is that the inorganic filler (especially mica) is contained in a high proportion. However, since inorganic fillers are necessary for ensuring the strength of sheet-like extruded products, simply reducing their content is not sufficient. This is because reducing the inorganic filler content can affect moldability and the coefficient of linear expansion of the sheet-like extruded product. Based on the above, the invento