Anti-blocking type mould and production process for mould

Abstract

The invention discloses an anti-blocking type mould and a production process for the mould, and relates to the technical field of foam-plastic forming. The anti-blocking type mould comprises an uppermould and a lower mould, wherein the upper mould and the lower mould are mutually matched to form a forming cavity; and a plurality of strip-shaped seams for allowing steam to enter the forming cavityare formed in the upper mould. The anti-blocking type mould solves the problem that needle eye shaped gas inlets of the conventional mould are easily blocked to affect use when high-temperature steampasses through the mould for foaming and forming foam-plastic particles, can prolong continuous working time of the mould, reduces labor intensity of maintaining the mould, and increases a productionrate.

Description

technical field [0001] The invention relates to the technical field of foam molding, in particular to an anti-blocking mold and a production process of the mold. Background technique [0002] Foam plastic mold, also known as plastic foam mold, is a molding device installed on a foam plastic molding machine. The foam plastic molding machine is a polystyrene foam molding equipment commonly used in China. There are two types of molding machines. Thick foam plastic parts or large and medium-sized foam plastic parts are often directly foamed by a foam plastic molding machine. There are vent holes with a diameter of 0.1~0.4mm on the mold for ventilation. Before molding, 0.1~0.2MPa heating steam is passed through. After the mold is preheated for 0.5min, the air outlet is opened, and the pre-fired The foam particles are injected into the mold cavity, the air outlet is closed, and 0.1~0.2MPa steam is introduced into the steam chamber to raise the temperature to about 110°C, the pre...

AI Technical Summary

Problems solved by technology

However, when the existing mold is used, there are two problems: first, because there is a relatively long distance between the surfaces of the air holes 11, there is a gap between the plastic particles expanded during the foaming process and the wall of the mold 1. The residual air void volume is formed between them, and these void volumes lead to more porous structures on the surface of the molded plastic parts, which affects the surface quality of the plastic parts; Scaling and clogging of the steam mesh 12 affect the use; third, due to the small aperture of the steam mesh 12, the distribution of the ventilation holes 2 is scattered, and when the steam enters the mold cavity, it is multi-point local inflow, resulting in local foaming of the foamed plastic. Uneven heating, which leads to slower molding of plastic parts

However, there is still the problem that some of the steam meshes are blocked and difficult to remove when the plastic particles are foamed and formed.

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