Application of packaging machine in bread and biscuit food1
Bread packaging is usually wrapped in flexible packaging materials, the main materials are wax paper, cellophane, plastic film and other materials. Waxed paper is the most economical packaging material. It also has sufficient stiffness on an automatic wrapping machine, is easy to seal, and can effectively prevent the loss of moisture. The disadvantage is that the transparency is not good, and it is easy to scratch and cause air leakage, causing the bread to lose moisture and dry out. At present, a considerable number of wax paper is still used in our country. The packaging cost of coated cellophane is much higher than that of wax paper, but it solves the problems of moisture resistance and heat sealing, and is more suitable for packaging of high-end bread. The cost of PE film packaging bread is about 30% lower than that of cellophane, but the thin film has poor mechanical operation process; PP film has better transparency than polyethylene, and has better stiffness and better mechanical operation performance, but BOPP heat It is difficult to seal; PE/PP/PE three-layer co-extrusion film meets the needs of bread packaging. At present, about 90% of the bread is packaged in PE or OPP film bags, which have a short shelf life and can be tied with heat-sealed or plastic-coated metal wires. OPP bags are also kinked and sealed by the bag mouth. Packed in shrink film. Biscuits have very low water content and contain fat. The packaging is mainly moisture-proof, grease-proof, and crack-proof; sandwich biscuits and colorful biscuits are often decorated with jam, nuts, cream, etc., and more attention should be paid to preventing enzymes and fat oxidation. Therefore, moisture-proof biscuits are selected. Light-shielding and oxygen-insulating packaging materials. Such as moisture-proof cellophane, PVDC plastic-coated paper, K-coated BOPP/PE, aluminum foil/PE and other composite films, etc., can be heat-sealed, with good gloss, and can meet the requirements of automatic computer automatic packing machine operation. Thermoforming boxes made of plastic sheets such as PVC and PS can protect the crispy biscuits from being crushed. Due to the development requirements of the process, new requirements are also put forward for the machinery and equipment for the production of biscuits and other foods. For this reason, there has also been a reform of the biscuit equipment. Kenwei brand packaging machines are widely used in biscuits, bread, candy, chocolate and other food packaging. middle.
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