Small-opening heat insulation container polyurethane foaming device and foaming layer filling process

Abstract

The invention relates to a small-opening heat insulation container polyurethane foaming device, which comprises an upper cover, a circumference fixing plate and a base, wherein the lower part of the circumference fixing plate is connected with the base, the upper part of the circumference fixing plate is buckled with the upper cover, an inserting opening used for inserting an opening of an inner liner and a compressed air interface communicated with the inserting opening are arranged in the base, a sealing ring is arranged in the inserting opening, and the sealing ring is embedded in an annular groove of the base. A foaming layer process for filling the heat insulation container comprises the following steps: installing the small-opening heat insulation container polyurethane foaming device on a production line; inserting the opening of the inner liner with a case into the sealing ring; and connecting an air pipe on the compressed air interface of the lower part of the base. When a fixed amount of liquid PU is injected in a sandwich layer of the case and the inner layer, after the upper cover is covered, the circumference fixing plate is merged. Then, compressed air is injected for resisting the foaming force so that the foaming reaches the qualified PU density, after the PU is completely cured, the compressed air supply is stopped, the upper cover is opened, the circumferencefixing plate is released, and the full-plastic small-opening heat insulation container can be taken out.

Description

technical field [0001] The invention relates to a jig for filling polyurethane (PU) in a small-mouth heat-retaining container and a filling process for filling the heat-insulation container with the jig, in particular to a polyurethane foaming device and a foaming device for a small-mouth heat-retaining container. layer filling process. Background technique [0002] Common foaming devices, such as polyurethane (PU) foaming devices used for refrigerator and freezer insulation, use rigid metal structure fixtures for the inner and outer layers, which support the outer shell and inner liner. When the liquid PU is injected, from the expansion of the liquid to the solidification of the PU, the strength of the fixture can support the expansion force generated by the foaming agent, so that the inner tank and outer shell of the refrigerator or freezer will not be deformed. But for all-plastic small-mouth insulation containers, rigid metal clamps cannot be placed inside the liner to ...

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Problems solved by technology

[0004] What the present invention aims to solve is the problem that the inner tank is easily deformed due to the expansion force generated by the foaming agent when the interlayer between the outer shell and the inner tank of the small-mouth heat-retaining container is filled with polyurethane

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