Process for producing negative pressure foamed refrigerator

Abstract

The invention discloses a process for producing a negative pressure foamed refrigerator, which comprises the following steps of: putting a refrigerator box into a sealing system, vacuumizing a box cavity to ensure a negative pressure state, feeding the box cavity, foaming feed liquid, filling and curing to form a foamed box. Compared with the conventional foamed refrigerator, the refrigerator manufactured by the process has the advantages of uniform foam density distribution, low feeding amount, low power consumption, high demoulding efficiency and the like.

Description

Technical field: [0001] The invention relates to a negative pressure foaming refrigerator production process, which belongs to the technical field of refrigerator foaming. Background technique: [0002] The foaming of refrigerators and freezers generally refers to rigid polyurethane foaming. The foam is between the outer shell and the inner lining of the refrigerator. Inject into the cavity of the mold box or door body to react and release heat. The foaming agent in the raw material is vaporized by heat to form micro-bubbles, which grow and expand, fill the cavity of the box body or door body, and solidify to form a hard foam. Polyurethane closed-cell foam. The performance and production process of the foam determine the performance of the refrigerator and freezer. [0003] The foam performance and production process are related to the reaction speed, and the gel time can be used to characterize the reaction speed. Generally, the faster the reaction speed, the finer the c...

AI Technical Summary

Problems solved by technology

[0004] At present, the foaming production efficiency of refrigerators is gradually improving, and the assembly process of the box body and the door body is becoming more and more refined. , the release of gas is accelerated, the air pressure in the cavity increases during the foam flow process, the flow resistance increases, and more raw materials are required to fill the entire cavity. The resulting refrigerator has high foam density, uneven distribution, low production efficiency, and poor thermal insulation performance.

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