Twin-sheet thermoforming is a process of vacuum or pressure forming two sheets of plastic essentially simultaneously, with a separate mold on the top and bottom
platens. Once the plastic has been molded, it remains in the molds, and while still at its forming temperature the two molds are brought together under high
pressures, and the two sheets are welded wherever the molds dictate a weld.

The process creates 3 dimensional parts with formed features on both sides. The parts are typically very strong, stiff, and quite light-weight.

Materials                                                      

• H.M.W. HD Polyethylene
• ABS
• PC/ABS
• Polycarbonate

Typical applications are:

pallets, industrial dunnage, portable toilets, medical housings, surfboards, fuel tanks, air/ventilation ducts, electrical enclosures, recreational boats, cases, toys,
marine products, doors, tables, spine boards and numerous transportation-related products.

Main Advantages

• Increased Structural Integrity and Rigidity
• Enclosed Cross-Section Capability
• Low Tooling Cost
• Internal Reinforcement Options: Structural Member, Rigid Foam, Etc.
• The process has some distinct advantages over blow-molding and rotomolding.

The process has some distinct advantages over blow-molding and rotomolding.

Compared to blow-molding, the twin-sheet process:

• Tooling and machines are more cost-competitive for small to modest run sizes.
• Each sheet may be a different thickness, material or color.
• More flexibility with parting line structure is possible.

Compared to Rotomolding, the twin-sheet process:

• Many more resin types are available in twin-sheeting.
• More structural beams can be created in twin-sheeting