PVC blister packaging industry: Process related problems and their solutions
The blister process is a transparent plastic plate made of a specific transparent protuberance that covers the surface of the product to protect and improve the aesthetics of the product by allowing a different level of protection. The substance on the surface of the blister tray has an ohm resistance value of less than one. The majority of IT is used for electronic applications to make IT products electrostatically traceable. PVC blister packaging is an important part of every industry, especially in the food industry.
1. Groove foaming: Poor volume of glue, a lower quantity of spraying or adhesive penetration of plate, insufficient preheating (softening PVC film), or plastic absorption time cause false suction (moulding time). Solution: Increase the temperature or vacuum to counteract this issue. Increase the sizing quantity and use high-quality plates. Increase the preheating or moulding time. Cool to ambient temperature or slightly higher after the moulding process before removing the vacuum. To prevent groove formation, we might combine it with a curing agent.
2. Local forming: When uneven glue spraying results in a small amount of local glue and a reduction in binding strength, this happens. The issue with PVC film is that it contains a plasticizer, which can migrate to the surface with age or heat, reducing bond strength. The blister machine's heating pipe is malfunctioning, resulting in uneven temperature. Solution: Try to keep the spray volume consistent or use high-quality PVC film; even routine equipment maintenance can help.
3. Edge cannot absorb or shrink edge: This only happens when the side temperature is low, the vacuum is insufficient, or the adhesive has insufficient temperature resistance. Remove the pressure before the temperature lowers after blister moulding. Solution: curing agent, increased temperature, or vacuum. Cool to room temperature or marginally higher after moulding before removing the suction.
When we talk about blisters, we usually mean hot, softened plastic sheets adsorbed on the mould surface, cooling, and generating a convex and concave plastic shape. Before we discuss the problems of the PVC blister packaging industry, it’s important to note the production process.
Now to the problems:
1. Groove foaming: Poor volume of glue, a lower quantity of spraying or adhesive penetration of plate, insufficient preheating (softening PVC film), or plastic absorption time cause false suction (moulding time). Solution: Increase the temperature or vacuum to counteract this issue. Increase the sizing quantity and use high-quality plates. Increase the preheating or moulding time. Cool to ambient temperature or slightly higher after the moulding process before removing the vacuum. To prevent groove formation, we might combine it with a curing agent.
2. Local forming: When uneven glue spraying results in a small amount of local glue and a reduction in binding strength, this happens. The issue with PVC film is that it contains a plasticizer, which can migrate to the surface with age or heat, reducing bond strength. The blister machine's heating pipe is malfunctioning, resulting in uneven temperature. Solution: Try to keep the spray volume consistent or use high-quality PVC film; even routine equipment maintenance can help.
3. Edge cannot absorb or shrink edge: This only happens when the side temperature is low, the vacuum is insufficient, or the adhesive has insufficient temperature resistance. Remove the pressure before the temperature lowers after blister moulding. Solution: curing agent, increased temperature, or vacuum. Cool to room temperature or marginally higher after moulding before removing the suction.
4. Blister product surfaces have to pit: These are the sorts that occur frequently, such as when the adhesive is large, when thin PVC film is used, when pitting is easy to manufacture, and when pitting is characterised by uniform dispersion. The curing agent is not completely diffused when used with it. The plate surface is not cleaned, or after spraying adhesive, the workshop dust is huge, sticking on, and this type of pitting is spread unevenly and in various sizes. Uneven dispersion and excessive glue viscosity. Pilling of the plate occurs when the viscosity of the adhesive is too low or the solid content is too low, resulting in block formation in the groove corner. The spray gun's air pressure is insufficient, and the atomization is poor. There are no contaminants in the glue. Solution: Choose a glue that has tiny particles. When the curing agent is introduced, the mixing time is increased in order to completely disperse the curing agent. Before spraying, clean the plate's surface and separate the spraying workshop. Choose a glue with a high solid content or an appropriate viscosity. Fine sandpaper can be used to polish the glue after it has cured. Adjust the atomization impact by increasing the vacuum level. When using a mesh filter.
5. Orange peel: It occurs due to excessive spilling of local glue, the presence of grease on the surface of the plate, or the curing agent used not being completely dispersed, resulting in the formation of a cavity. Solution: It is important to spray an adequate amount of glue all over the surface, but before you spray, make sure that the surface is made crystal clear. And for the curing agent, must be stirred properly before it is completely dispersed.
Final words:
These are some of the problems that every PVC blister packaging industry faces and these solutions are quite handy in preventing the problems.
Final words:
These are some of the problems that every PVC blister packaging industry faces and these solutions are quite handy in preventing the problems.
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