A MANUFACTURING METHOD OF POLYOLEFIN SHEET USING BUTANE GAS WITH SUPERCRITICAL CO_2 GAS

摘要

The present invention relates to a method for manufacturing a polyolefin-based sheet by using butane gas and carbon dioxide gas in a supercritical state. The purpose of the present invention is to provide a method for manufacturing a polyolefin-based sheet by using butane gas and carbon dioxide gas in a supercritical state, wherein the size of a foamed cell is small and stable physical properties of the polyolefin-based sheet can be maintained by injecting inert gas in a supercritical state which has high stability and low affinity, diffusible properties, and solubility with respect to a polyolefin-based resin. When the present invention is applied, the polyolefin-based sheet manufactured by using butane gas and carbon dioxide gas in a supercritical state has a small cell size and high compression strength when compared to a sheet of a comparative example which is foamed by using butane gas only. Therefore, the cell of the polyolefin-based sheet can be formed to be stronger than an existing cell, and the cell is prevented from being broken during forming.