When using PCR polyolefin shrink film for packaging, how to avoid the appearance defects such as bubbles or wrinkles?- Zhejiang Zhongcheng Packing Material Co., Ltd.

When using PCR polyolefin shrink film for packaging, how to avoid the appearance defects such as bubbles or wrinkles?

Measures to avoid appearance defects such as bubbles or wrinkles when using PCR polyolefin heat shrink film for packaging include:

Preheating the shrink film before wrapping it around the product. This can be done by hanging the shrink film in a preheating area or using an infrared radiation preheater. Preheating helps the shrink film adhere better to the product, reducing bubbles and wrinkles.

Precisely controlling the temperature and conveyance speed of the shrink machine according to the type of PCR polyolefin heat shrink film used. Too high a temperature may cause the film material to relax, resulting in bubbles; too low a temperature or slow speed may also result in incomplete shrinkage, leading to wrinkles.

Ensuring that the size of the shrink chamber matches the product size. If the chamber is too small, the film material may contact the chamber wall and cause wrinkles; if it is too large, uneven shrinkage may occur.

Before packaging, check that the product surface is clean, dry, and free of oil or dust. These impurities may prevent the shrink film from tightly adhering to the product, causing bubbles and wrinkles.

Choosing PCR polyolefin heat shrink film that suits the product characteristics and packaging requirements. Different film materials have different shrinkage properties and application ranges, and selecting the correct material is key to avoiding bubbles and wrinkles.

Adjusting the tension of the shrink film appropriately during the packaging process. High tension may cause the film material to be too tight, with a chance of wrinkles; too low tension may cause the film material to relax, resulting in bubbles.

Ensuring that the product is placed correctly in the shrink chamber, should be placed smoothly on the conveyor belt, avoiding tilting or shaking, which can eliminate the occurrence of bubbles and wrinkles.

Regular inspection and maintenance of the shrink machine are also important to ensure the normal operation and accurate control of the equipment. Equipment failures or inaccurate control are likely to result in bubbles and wrinkles during the packaging process, or even more severe consequences.

By preheating the shrink film, controlling the shrink temperature and speed, using appropriate shrink chambers, ensuring the cleanliness of product surfaces, selecting the correct film material, adjusting film tension, paying attention to product placement, and regularly inspecting and maintaining equipment, it is possible to effectively avoid appearance defects such as bubbles or wrinkles when using PCR polyolefin heat shrink film for packaging.