Constant temperature freezing bag for food packaging, has laminates of foamed polyethylene filled into cavities defined by welding of some plastic bags

摘要

Laminates of foamed polyethylene are filled into the cavities defined by welding of some plastic bags. The laminates absorb liquid e.g. water, dripping by promoting chemical reaction with sodium polyacrylate and glycol polypropylene when subjected to extreme cold. The bag can be put at vertical position inside the boxes to allow foods to be put in the box.