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Analysis of Heat Sealability of Plastic Packaging Bags

by:Supouches Packaging     2022-09-02
Plastic packaging bag is a kind of packaging bag that uses plastic as raw material for various supplies in our lives. It is widely used in daily life and industrial production. If the heat sealing performance of plastic packaging bags is not good, it will affect the quality of goods. Storage quality, plastic packaging bags will not play a very good role in protecting the goods. So what are the factors related to the heat sealability of plastic packaging bags? Different plastic packaging bags have different heat-sealing properties. Food plastic packaging bags with large particles and high density require high heat-sealing strength of the plastic packaging bags. It is easy to fly dust, and the heat sealing of inclusions in plastic flexible packaging materials is required to be better. After the heat-sealing material is determined, the heat-sealing quality is also related to the heat-sealing process, and the temperature, pressure and time of heat-sealing are usually mainly controlled. During heat sealing, the plastic film becomes a viscous flow state when the heat sealing temperature is above the heat sealing pressure; while the heat sealing pressure makes the interface molecules of the plastic film in the viscous flow state generate an external power of mutual penetration and diffusion; a certain heat sealing time will Make the interface molecules of the plastic film penetrate and diffuse each other as soon as possible, so that the interface disappears and becomes a whole, so it has good sealing performance. The lower heat sealing temperature of the heat sealing material depends on the melting temperature of the material. The heat sealing temperature should be higher than the melting temperature of the heat sealing material. However, how much is higher depends on whether the material to be sealed is a single film or a composite film, and the thickness of the film. , heat sealing pressure, heat sealing speed and other technical indicators. Generally, the heat sealing pressure is high; the heat sealing speed is slow; the film thickness is large, the heat sealing temperature can be lower, and vice versa.
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