For different packaging contents and different uses, the material structure of the composite packaging bag is also different. The cooking bag, biscuit packaging and laundry liquid packaging bag are several common packaging products in our lives.
1. Steaming bags
1. Packaging requirements
Compound packaging bags for meat, poultry, etc. are required to have good packaging barrier properties, resistance to bone piercing, and sterilization under cooking conditions without breaking, cracking, shrinkage, or odor.
2. Design structure
Transparent class:
BOPA / CPP , PET / CPP, PET / BOPA / CPP, BOPA / PVDC / CPP, PET / PVDC / CPP, GL-PET / BOPA / CPP.
Aluminum foil:
PET / AL / CPP , PA / AL / CPP, PET / PA / AL / CPP, PET / AL / PA / CPP.
3. Design reasons
PET : high temperature resistance, good rigidity, good printability and high strength.
PA : High temperature resistance, high strength, flexibility, good barrier properties, and resistance to wear and tear.
AL : Best barrier property, high temperature resistance.
CPP : It is a high-temperature cooking grade with good heat sealability, non-toxic and tasteless.
PVDC : barrier material.
GL-PET : ceramic vapor-deposited film, good barrier property, microwave transmission.
Choose the appropriate structure for the specific product, the transparent tape is mostly used for cooking, and the aluminum foil bag can be used for ultra-high temperature cooking.
2. Biscuit packaging
1. Packaging requirements
Good barrier property, strong shading property, oil resistance, high strength, odorless and tasteless, crisp packaging.
2. Design structure
BOPP / EXPE / VMPET / EXPE / S-CPP .
3. Design reasons
BOPP : good rigidity, good printability and low cost.
VMPET : good barrier property, avoid light and oxygen, water.
S-CPP (modified CPP): low temperature heat sealability and oil resistance.
3. Stand-alone bag of laundry detergent
1. Packaging requirements
High strength, impact resistance, burst resistance, good barrier properties, good rigidity can stand up, stress cracking resistance, good sealing performance.
2. Design structure
Three-dimensional: BOPA / LLDPE; bottom: BOPA / LLDPE.
Three-dimensional: BOPA / reinforced BOPP / LLDPE; bottom: BOPA / LLDPE.
Three-dimensional: PET / BOPA / reinforced BOPP / LLDPE; bottom: BOPA / LLDPE.
3. Design reasons
The above structure has good barrier property, large material rigidity, suitable for self-supporting bags, and good flexibility at the bottom, suitable for processing. The inner layer is modified PE, which has good resistance to sealing pollution. Strengthening BOPP increases the mechanical strength of the material and strengthens the barrier properties of the material. PET improves the water resistance and mechanical strength of the material.
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