HDPE Bottle Blowing Machine

The application of HDPE bottle blowing machine in 2-3 layer co-extrusion multi-layer structure mainly realizes the compounding of different materials through co-extrusion technology to meet the requirements of packaging or industrial products for barrier properties, strength, cost optimization, etc. The following are its typical applications and technical points:

1. Food packaging

Structural example (3 layers): PE/EVOH/PE

Outer layer (PE): provides mechanical strength and printability.

Middle layer (EVOH): high oxygen barrier, extending the shelf life of food.

Inner layer (PE): good heat sealing, direct contact with food.

Application: condiment bottles, juice packaging, dairy containers.

2. Chemical packaging

Structural example (2 layers): HDPE/recycled material

Outer layer (HDPE): ensure appearance and chemical resistance.

Inner layer (recycled material): reduce cost, suitable for non-direct contact side.

3. Medical packaging

Structural example (3 layers): PP/adhesive layer/PA

PP layer: high temperature resistant (sterilizable).

PA layer: barrier to moisture and gas.

4. Industrial containers

Structural example: HDPE/barrier layer/HDPE

Used for fuel tanks and pesticide bottles, need to be impermeable.

1. Material optimization

Combining materials with different characteristics (such as barrier layer + structural layer) to reduce costs while maintaining performance.

2. Efficient production

Single-shot molding of multi-layer structure reduces subsequent compounding processes.

3. Environmental protection

The inner layer can use recycled materials, and the outer layer maintains the appearance quality.

1. Co-extrusion die

Multi-layer flow channel design to ensure uniform thickness of each layer (such as heart-shaped or spiral die).

2. Extruder configuration

Each layer has an independent extruder (such as 3 layers require 3 units) to accurately control the melt temperature and flow rate.

3. Interlayer bonding

Adhesive resin (such as EAA) or compatible materials are required to avoid stratification.

• High barrier materials: Increased application of EVOH and PVDC.
• Lightweighting: Reduce wall thickness and material consumption through multi-layer design.
• Sustainable solutions: Accelerated development of recyclable multi-layer structures (such as full PE systems).

HDPE bottle blowing machine technology is gradually replacing single-layer products, especially in the field of high-end packaging, with significant flexibility and functional advantages.

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