The production of square bottom bags, the quality of packaging bags and heat sealing quality, the whole process of packaging, transportation, storage of contents, commodity distributors and other important links are all very harmful. So what problems are prone to occur in the heat sealing process of square bottom bags?
1. What should I do if the contents are moldy due to the bad square bottom bag?
The anti fouling heat sealing property of plastic film is poor, mainly because the epoxy resin used in the inner permeable layer is not suitable.
Choose plastic film with good dirt resistance and heat sealing.
Generally speaking, LDPE has a medium level of antifouling heat sealing property, EVA has excellent antifouling heat sealing property when VA composition is large, LDPE also has excellent antifouling heat sealing property, and inorganic compound epoxy resin and metallocene polymer have antifouling heat sealing property.
2. How should Jinan square bottom bag seal become brittle and brittle fracture?
(1) The heat seal temperature is too high.
(2) Working pressure is too high.
(3) The heat sealing time is too long.
(4) The edge of the upper seal is too sharp or the PTFE covered is damaged.
(5) The silicone sealed at the bottom is solid.
(6) In the whole process of compounding and ripening, part of the adhesive penetrates into the plastic film. Due to the penetration of adhesives, the ductility (impact resistance) of plates has been reduced to a certain extent, and the ductility has been improved.
(7) After the composite packaging with square bottom bags is refrigerated and placed, the compressive strength of heat sealing is improved to a certain extent, and in addition, it also changes and tends to be brittle.
(1) According to the heat sealing characteristics of the raw materials of the inner permeable square bottom bag, the suitable production and processing temperature, working pressure and heat sealing time are selected.
(2) Improve the surface condition of the upper heat sealing knife to level the surface of the sealer.
(3) The PTFE cloth is intact.
(4) Choose a silicone pad with suitable strength.
The problems and solutions in the process of square bottom bag are explained from these two aspects. If you don't understand anything about it, come to our company https://www.jnsuliao.com Consult and understand.