Common problems and solutions in the use of vacuum plastic

Vacuum plastic is a special water-based adhesive based on polyurethane (PU), which has two forms: two-component system (curing agent needs to be added during use) and one-component reactive system (curing agent has been way to combine). One-component reactive systems are produced with the curing agent combined in a specific way that does not react under normal temperature and ambient conditions. According to the composition of the emulsion, the common types of glues in vacuum blistering include PU emulsion (polyurethane), PU/EVA mixed emulsion, and EVA emulsion. There will be some problems in the process of vacuum suction. Today, ZHONGSHAN LINYANG PLASTIC CO.LTD will collect these problems for everyone and solve them one by one. 1. Analysis of the reasons for the inability to absorb or shrink the edge: ①When blistering, the side temperature is too low or the vacuum degree is not enough; ②The temperature resistance of the glue is not enough; ③After the blister molding, the temperature has not dropped , the pressure is removed. Solution: ① Increase the temperature or vacuum degree; ② Use with curing agent; ③ After plastic forming, the temperature is cooled to room temperature or slightly higher, and then the vacuum is withdrawn. 2. Analysis of the causes of local foaming: 1. The glue spraying is uneven, resulting in a small amount of local glue, which reduces the bonding strength; 2. The problem of PVC film, PVC film contains plasticizers, which will become plasticized in the case of aging or heating The agent is easy to migrate to the surface, which affects the bonding strength; ③ There is a problem with the heating tube in the blister machine, resulting in uneven temperature. Solution: ① Try to make the amount of glue sprayed evenly; ② Use good quality PVC film; ③ Repair the equipment in time. 3. Analysis of the causes of large-area bubbles: ①The temperature or pressure does not meet the requirements, resulting in false suction; ②The amount of glue is not enough, the amount of spraying is small or the sheet is glued; ③The preheating (softening the PVC film) or the time for blistering (molding time) is not enough ; ④ After the plastic forming, the pressure is cancelled before the temperature has dropped; ⑤ The heat resistance of the glue itself is not enough. Solution: ①Increase the temperature or vacuum degree; ②Increase the amount of glue, choose a good quality plate; ③Increase the preheating or forming time; Use with curing agent. Founded in 2003, Zhongshan ZHONGSHAN LINYANG PLASTIC CO.LTD Decoration Materials Co., Ltd. is a modern enterprise specializing in the production, sales and service of PVC blister film for cabinets. The company covers an area of u200bu200b20,000 square meters and has an existing asset of 200 million yuan. It is the largest PVC sales company in the Central Plains region. At the same time, small batch delivery and 24-hour fastest delivery service are provided.

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