Blow Molding Technology: Extrusion Blow Molding Process And Product Advantages

  Blow molding is a widely used process in the manufacturing of plastic products, available in three primary forms: Extrusion Blow Molding (EBM), Injection Blow Molding (IBM), and Injection Stretch Blow Molding (ISBM). Each method offers unique benefits:

1.Extrusion Blow Molding (EBM):

1. 1. Ideal for high-volume production of hollow parts

2. 2. Capable of producing complex shapes

3. 3. Allows for a broad range of material choices

2.Injection Blow Molding (IBM):

1. 1. Suitable for small to medium-sized hollow parts

2. 2. Ensures high precision and consistency

3. 3. Faster production cycles

3.Injection Stretch Blow Molding (ISBM):

1. 1. Used for high-performance containers like beverage bottles

2. 2. Provides superior mechanical properties and clarity

3. 3. Material-efficient

Extrusion Blow Molding (EBM) Process

  Extrusion Blow Molding (EBM) is a highly utilized method in blow molding, involving several critical steps:

Technical Description of Extrusion Blow Molding

Stage 1:

1. 1. Plastic polymer is extruded into a mold using standard extrusion components.

2. 2. The polymer appears as a circular tube, known as a parison, and the extrusion process is continuous.

Stage 2:

1. 1. Once the parison reaches the desired length, the mold closes around it, forming a seal.

2. 2. The parison’s top is cut off, and air is blown into the mold, causing the polymer to conform to the mold's shape.

3. 3. The hot polymer solidifies in the cooled mold.

Stage 3:

1. 1. The part is removed from the mold after sufficient cooling.

Stage 4:

1. 1. Trimming is performed using trimmers to remove excess material.

  The primary advantages of EBM include the flexibility to choose from a wide range of materials and the ability to produce complex shapes efficiently. Our factory employs materials such as polypropylene (PP), polyethylene (PE), PET, polyvinyl chloride (PVC), high-density polyethylene (HDPE), and low-density polyethylene (LDPE).

Advantages and Disadvantages of Blow Molding Products

Advantages:

1. Lower Cost: Blow molding machinery and molds are generally less expensive than injection molding, reducing overall production costs.

2. Low Residual Stress: The parison is formed at low pressure, resulting in products with less residual stress and better performance in tensile, impact, bending, and environmental resistance.

3. Higher Molecular Weight Plastics: Blow molding uses plastics with higher molecular weights, providing better impact toughness and environmental stress cracking resistance.

4. Adjustable Wall Thickness: Easily adjust the product's wall thickness by modifying the extrusion head gap, beneficial for products requiring precise wall thickness.

5. Thin-Walled Products: Capable of producing very thin-walled products not achievable through injection molding.

6. Complex Shapes: Can produce complex, irregular, and integral products, unlike injection molding which may require assembly of multiple parts.

Disadvantages:

Generally lower precision compared to injection-molded products.

Our Production Lines

  Our primary blow molding production line is a key part of our operations. Additionally, we have a fully developed injection molding production line. We also have dedicated production lines for coloring processes such as baking paint, powder coating, and spray painting, as well as electronic assembly. Supported by our extensive R&D team, we have accumulated valuable experience over the years, with hundreds of different blow mold designs.

Our factory is committed to innovation and excellence in blow molding technology, continually striving to meet our customers' diverse needs with high-quality products. We will continue to push the boundaries in blow molding and product development to maintain our industry-leading position.

Our R&D products：