Automatic gas rotational moulding method

Abstract

The invention discloses an automatic gas rotational moulding method, and relates to the technical field of rotational moulding. The automatic gas rotational moulding method comprises the following steps of 1, selecting a die; 2, preheating fillers; 3, heating gas; 4, controlling temperature; and 5, carrying out rotational moulding. According to the automatic gas rotational moulding method, a fluorocarbon release agent is sprayed in the die so as to cover the inner surface of the rotational moulding die in a film shape to facilitate subsequent demoulding of a finished product; a preheating stepis arranged before charging the fillers, so that a certain temperature exists in the rotational moulding die, thermoplastic polymers in the die are preliminarily melted more uniformly in the rotational moulding process, the influence of uneven temperature on product density caused by continuous heat absorption of internal raw materials at the same position in the preliminary rotational moulding process is avoided, and the control temperature synchronism in the rotational moulding process of the die is better; and the temperature of the rotational moulding die can be conveniently monitored through a temperature sensor in the heating process, and a gas valve can be automatically controlled according to the monitored temperature to adjust the flow of the gas so that the temperature in the rotational moulding process can be controlled.

Description

technical field [0001] The invention relates to the technical field of rotational molding, in particular to a gas automatic rotational molding method. Background technique [0002] Rotational molding is a thermoplastic hollow molding method. Including PE and other dry powder molding rotomolding, PVC paste resin slush molding and liquid monomer polymerization molding rotomolding three categories. The three types of rotational molding have their own characteristics, but the general principle is the same. That is, first inject powdery or pasty or monomeric materials into the mold, and through the heating of the mold and biaxial rolling rotation, the material will be evenly filled with the inner cavity of the mold and melted by its own gravity, and then demoulded after cooling. Hollow products. [0003] The existing rotomolding method is not convenient for real-time monitoring of the mold temperature, and the degree of automation is insufficient. It cannot automatically adjus...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the deficiencies of the prior art, the present invention provides a gas-fired automatic rotomoulding method, which solves the problem that the existing rotomolding method proposed in the above-mentioned background technology is not convenient for real-time monitoring of the mold temperature, and the degree of automation is not enough to automatically Adjust the gas flow to control the heating temperature, and use normal pressure to form naturally during the molding process. The normal pressure method makes the raw materials in the hollow cavity of the mold prone to deformation during cooling and molding, which leads to the quality of the finished product of rotational molding. bad question