The most complete knowledge of flexible packaging structure in history

[Chinese Packaging Network News] This paper summarizes the structure and functional design requirements of different types of packaging bags, the most complete in history, and speed to collect.

1, cooking bags

Packaging requirements: used for meat, poultry and other packaging, requires good barrier properties, resistance to broken bone holes, under the cooking conditions sterilization is not broken, no crack, no shrinkage, no odor.

Design structure:

Transparent: BOPA/CPP, PET/CPP, PET/BOPA/CPP, BOPA/PVDC/CPP

PET/PVDC/CPP, GL-PET/BOPA/CPP

Aluminum foils: PET/AL/CPP, PA/AL/CPP

PET/PA/AL/CPP, PET/AL/PA/CPP

Design reason:

PET: high temperature resistance, good rigidity, good printability, and high strength.

PA: high temperature resistance, high strength, flexibility, good barrier properties, and puncture resistance.

AL: Best barrier property, high temperature resistance.

CPP: for high temperature cooking grade, good heat sealing, non-toxic and tasteless.

PVDC: high temperature barrier material.

GL-PET: Ceramic evaporation film, good barrier properties, through the microwave.

For the specific product choose the appropriate structure, transparent bags are mostly used for cooking, AL foil bags can be used for ultra-high temperature cooking.

2. Expanded snack foods

Packaging requirements: Oxygen barrier, water blocking, light protection, oil resistance, fragrance protection, appearance, scratch, colorful, and low cost.

Design Structure: BOPP/VMCPP

Reason for design: Both BOPP and VMCPP are very scratchy, BOPP has good printability and high gloss. VMCPP is good in barrier property, keeping moisture and moisture. CPP oil resistance is also better.

3, miso packaging bags

Packaging requirements: odorless and tasteless, low temperature sealing, anti-seal pollution, good barrier properties, moderate price.

Design structure: KPA/S-PE

Reason for design: KPA has excellent barrier property, good toughness, high fastness to PE, easy to break, and good printability. Modified PE is a variety of PE blends (co-extrusion), low heat seal temperature, and strong seal-resistance.

4, biscuit packaging

Packaging requirements: good barrier properties, strong shading, oil resistance, high strength, odorless, tasteless, very scratchy packaging.

Design structure: BOPP/EXPE/VMPET/EXPE/S-CPP

Reason for design: BOPP has good rigidity, good printability, and low cost.

VMPET has good barrier properties, avoids light and oxygen, and blocks water.

S-CPP has good low temperature heat sealing and oil resistance.

5, milk powder packaging

Packaging requirements: long shelf life, keep the smell, anti-oxidation, deterioration, anti-absorbing agglomerate.

Design structure: BOPP/VMPET/S-PE

Reason for design: BOPP has good printability, good gloss, good strength and moderate price.

VMPET has good barrier properties, is protected from light and has good toughness, and has a metallic luster to be reinforced with aluminized PET. The AL layer is thick. S-PE has good anti-pollution sealability and low temperature heat sealability.

6, green tea packaging

Packaging requirements: anti-deterioration, anti-discoloration, anti-odor, which is to prevent the green tea contained protein, chlorophyll, catechin, Victoria C oxidation.

Design structure: BOPP/AL/PE, BOPP/VMPET/PE, KPET/PE

Reasons for design: AL foil, VMPET, and KPET are excellent materials with excellent barrier properties, and have good barrier properties against oxygen, water vapor, and odors. AK foil and VMPET are also excellent in light protection. The price of the product is moderate.

7, edible oil

Packaging requirements: anti-oxidation, good mechanical strength, high burst strength, high tear strength, oil resistance, high gloss, transparency

Design Structure: PET/AD/PA/AD/PE, PET/PE, PE/EVA/PVDC/EVA/PE, PE/PEPE

Reason for design: PA, PET, PVDC have good oil resistance and high barrier property. PA, PET, PE have high strength, inner layer PE is special PE, anti-seal pollution is good, and tightness is high.

8, milk film

Packaging requirements: good barrier properties, high burst strength, light protection, good heat sealability, and affordable price.

Design structure: white PE/white PE/black PE

Reasons for design: The outer layer has good PE gloss, high mechanical strength, the middle layer PE is the strength bearer, the inner layer is the heat seal layer, and it is protected from light, blocking, and heat sealing.

9, grinding coffee packaging

Packaging requirements: Anti-absorbing, anti-oxidation, anti-vacuum products hard block, keep coffee volatile, easily oxidized aroma.

Design Structure: PET/PE/AL/PE, PA/VMPET/PE

Reason for design: AL, PA and VMPET have good barrier properties, water resistance, gas barrier, and PE heat sealability.

10, chocolate

Packaging requirements: good barrier properties, dark, beautiful printing, low temperature heat sealing.

Design Structure: Pure Chocolate Varnish / Ink / White BOPP / PVDC / Cold Sealant

Brownie Varnish / Ink / VMPET / AD / BOPP / PVDC / Cold Sealant

Reasons for design: PVDC and VMPET are high barrier materials, and the cold sealant can be sealed at a very low temperature. The heat will not affect the chocolate. Since the nuts contain more grease, it is easy to oxidize and degenerate, so an oxygen barrier layer is added in the structure.

11, beverage packaging bags

Packaging requirements: PH value of acidic beverages < 4.5, pasteurization, general barrier properties.

Neutral beverages have a pH value of > 4.5, and have high bactericidal and barrier properties.

Design structure:

Acidic drinks: PET/PE (CPP), BOPA/PE (CPP), PET/VMPET/PE

Neutral Beverages: PET/AL/CPP, PET/AL/PA/CPP, PET/AL/PET/CPP, PA/AL/CPP

Reason for design: For acidic beverages, PET, PA can provide good barrier properties, resistance to pasteurization, due to acidic extended shelf life. For neutral beverages, AL offers the best barrier properties, PET, PA high strength, high temperature sterilization.

12, liquid detergent three-dimensional bags

Packaging requirements: high strength, impact resistance, burst resistance, good barrier properties, good rigidity can stand up, stress cracking, sealing is good.

Design structure:

1 stereo: BOPA/LLDPE; bottom: BOPA/LLDPE.

2D: BOPA/BOPP/LLDPE; Bottom: BOPA/LLDPE.

3D: PET/BOPA/reinforced BOPP/LLDPE; bottom: BOPA/LLDPE.

Reason for design: The above structure has good barrier property, large material rigidity, suitable for three-dimensional packaging bags, and the bottom is flexible and suitable for processing. The inner layer is modified PE and has good sealing and sealing resistance. Strengthening BOPP increases the mechanical strength of the material and enhances the barrier properties of the material. PET improves the material's water resistance and mechanical strength.

13, aseptic packaging cover material

Packaging requirements: All are sterile during packaging and use.

Design structure: Coating/AL/peel layer/MDPE/LDPE/EVA/peel layer/PET.

Reason for design: PET is a sterile protective film that can be peeled off. When entering the aseptic packaging area, PET is exposed to expose the sterile surface. The AL foil peel layer was opened when the customer was drinking. On the PE layer, the drinking hole is flushed in advance, and when the AL foil is opened, the drinking hole is exposed. AL foil is used for high barrier, MDPE rigidity is better, AL foil has better thermal adhesiveness, LDPE is cheaper, VA content of inner layer EVA is 7%, VA >14% is not allowed to directly contact food, EVA low temperature heat sealing anti-sealing pollution Good sex.

14, pesticide packaging

Packaging requirements: As the highly toxic pesticides seriously endanger personal and environmental safety, the packaging requires high strength, good toughness, impact resistance, drop resistance, and good sealing.

Design structure: BOPA/VMPET/S-CPP

Reason for design: BOPA has good flexibility, puncture resistance, high strength, and good printability. VMPET has high strength and good barrier properties, and can use increased thicker plating materials. S-CPP provides heat sealing and barrier corrosion resistance, using terpolymer PP. Or multi-layer co-extruded CPP with high barrier EVOH, PA layer.

15, heavy bags

Packaging requirements: Heavy packaging is used for agricultural products such as rice, beans, chemical products (such as fertilizer) and other packaging, the main requirement is good toughness, and the necessary barrier properties.

Design structure: PE/plastic fabric/PP,PE/paper/PE/plastic fabric/PE,PE/PE

Reason for design: PE provides sealing, good flexibility, resistance to drop, high strength plastic fabrics.