Forming process and system for manufacturing packaging expanded polystyrene

Abstract

The invention relates to a forming process and system for manufacturing packaging expanded polystyrene. The process comprises the steps of (1) first-stage expansion, (2) second-stage expansion, (3) material feeding, (4) three-stage expansion, (5) thermal insulation, (6) primary cooling, (7) secondary cooling, (8) final cooling and (9) mould removing. The system comprises a first-stage expansion machine, a second-stage expansion machine, an expanded polystyrene forming machine, a water bin used for the primary cooling, a drying purifier for the secondary cooling, a negative pressure cooling device for the final cooling, and a boiler used for generating water vapor. According to the process and the system, two purposes can be realized by one system, so that the cost of production and manufacturing can be lowered; water in the packaging expanded polystyrene can be dried by thermal insulation, so that the forming quality is improved; the water cooling and the negative pressure cooling are combined, so that the cooling of a mould is accelerated, the processing and manufacturing period is shortened, and the production efficiency is improved; the cooling of the mould is divided into three stages, the phenomena of holes, and incompleteness and irregular deformation of the packaging expanded polystyrene caused by abrupt temperature drop can be avoided, so that the forming quality of the packaging expanded polystyrene can be effectively improved.

Description

technical field [0001] The invention relates to the technical field of foam plastic manufacturing, in particular to a molding process and system for manufacturing packaging foam plastic. Background technique [0002] There are many types of foam plastics, such as PE, PF, UF, PUR, XPS and EPS, etc., and are mostly used for building wall and roof insulation, composite board insulation, cold storage, air conditioning, vehicle, ship insulation, flooring Heating, decoration carving, and product packaging, etc., are widely used. [0003] In the processing and manufacturing process of packaging foam plastics, electric heating is used to realize the molding of foam plastics. This method has high cost and poor molding effect; The mold is cooled by air cooling, and it still takes a long time to demould, the production efficiency is low, and the processing and manufacturing cycle is long; another example is the Chinese patent application number 201210118696.9, which was published on A...

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Problems solved by technology

[0003] In the processing and manufacturing process of packaging foam plastics, electric heating is used to realize the molding of foam plastics. This method has high cost and poor molding effect; The mold is cooled by air cooling, and it still takes a long time to demould, the production efficiency is low, and the processing and manufacturing cycle is long; another example is the Chinese patent application number 201210118696.9, which was published on August 15, 2012. A production process of EPS foam products, the process steps are: material preparation, pre-foaming, curing, feeding, mold preparation, heating molding, water cooling, vacuum cooling and demoulding, etc., using a two-way compressed air supply system to improve It improves the cooling efficiency, saves electric energy and steam, and at the same time achieves the rational use of energy. It adopts the method of mixing high and low temperature wind. No matter how high the foaming density of the product is, it will not deform and expand the product, shorten the drying time, and achieve resource utilization. rational use of

However, the foam after the heating molding step of this process is not heat-insulated, and there will be moisture and gas residues, which makes the drying of the foam incomplete, and pores and incomplete phenomena will appear after the foam molding, which seriously affects the molding quality of the foam. , bringing certain economic losses to the manufacturer; only water cooling and vacuum cooling are used, the temperature drop is relatively large, and the way of sudden temperature drop will make the internal heat dissipation rate of the foam product in the mold body lower than the heat dissipation rate of its outer surface , resulting in a large internal pressure, which is easy to produce irregular shapes, and there will be cavities inside the foam product, and the filling effect is poor, which will eventually affect the molding quality of the product

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