The Difference Between Rotational Molding And Blister Molding

Roto-molding and blister molding are two different plastic processing methods, which are significantly different in principle, equipment, application and product characteristics. The following are the main differences between the two:

1. Process principle
Roto-molding:

Plastic powder or liquid is placed in the mold, the mold rotates along two axes and is heated, so that the plastic is evenly coated on the inner wall of the mold, and demolded after cooling.

Blister molding:

The plastic sheet is heated and softened, adsorbed on the mold surface by vacuum, and formed after cooling.

2. Equipment
Roto-molding:

Use a roto-molding machine that can rotate along two axes, equipped with a heating and cooling system.

Blister molding:

Use a blister molding machine equipped with a heating, vacuum system and mold.

3. Mold
Roto-molding:

Usually a steel or aluminum mold, with a more complex structure and higher cost.

Blister molding:

Molds are mostly made of aluminum or resin, with a simpler structure and lower cost.

4. Raw materials
Rotational molding:

Use plastic powder or liquid, such as polyethylene (PE), polyvinyl chloride (PVC), etc.

Blister molding:

Use plastic sheets, such as polystyrene (PS), polypropylene (PP), polyvinyl chloride (PVC), etc.

5. Product characteristics
Rotational molding:

Suitable for the production of hollow, large, complex-shaped products with uniform wall thickness and high strength.

Blister molding:

Suitable for the production of thin-walled, simple-shaped products, such as packaging boxes, trays, etc., with thin walls.

6. Application areas
Rotational molding:

Used in the production of water tanks, toys, auto parts, large containers, etc.

Blister molding:

Used in the production of food packaging, electronic product packaging, medical device trays, etc.

7. Production cycle
Rotational molding:

The production cycle is longer because it requires heating, rotation and cooling.

Blister molding:

The production cycle is shorter and suitable for mass production.

8. Cost
Rotational molding process:

The mold and equipment costs are relatively high, suitable for small batches and high value-added products.

Thermoforming process:

The mold and equipment costs are relatively low, suitable for mass production.

Summary
Rotational molding process: suitable for the production of hollow, large, complex-shaped products, with uniform wall thickness and high strength.

Thermoforming process: suitable for the production of thin-walled, simple-shaped products, with short production cycles and low costs.

Choosing the appropriate process according to product requirements can effectively improve production efficiency and product quality.