Aluminum foil packaging bag is a new type of packaging material in the logistics industry, which can be widely used for centralized packaging of various commodities, and is widely used in foreign trade export, papermaking, hardware, plastic chemical industry, building materials, food and medicine and other industries. in productionPEWhen stretching the film, there is a great requirement on the temperature, so the productionPEWhat are the temperature requirements when stretching the film? Specifically, it can be divided into the following two stages:The first warm-up stage: in the guaranteedPEUnder the premise that the stretched film blank is not affected by steam, as long as the steam is continuously and evenly sent into the curing chamber1-1.5Hours, the heating time should be as short as possible.The second constant temperature stage: the constant temperature stage is an important stage. In this stage, the green body undergoes hydration and hydrothermal synthesis to increase the strength. With the prolongation of the constant temperature time, more and more hydrates are produced, and the strength increases faster and faster. However, after a certain time at constant temperature, the strength growth starts to slow down. The inflatable block blanks produced by different raw material ratios and different production processes have the corresponding optimal constant temperature time.For example: when in96~100Under the hot and humid conditions of ℃, the constant temperature time in spring and autumn is8hours, summer is7hours in winter10Hour. In the cooling stage, when the production volume is large and the space in the curing room is not enough, the door of the curing room should be opened to adopt rapid cooling, which will lead toPEStretch film internal and external temperature difference stress, resulting in surface tension, easy to form micro-cracks. Therefore, the cooling rate must be controlled. Cooling rate per30minutes should not exceed10℃. The temperature difference between indoor and outdoor should not exceed30℃, finished productPEStretch film can leave the curing room.
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