Secondary Operations

Plastic Welding

Whether your injection molded part is large or small, simple or complex; Thumb specializes in a variety of techniques used for plastic welding whether it is plastic to plastic, plastic to metal, or plastic to vinyl, ensuring the best result for your particular application.


Infrared Plastic Welding


A fairly new technique used for welding plastic is Infrared Plastic Welding. This welding technique is typically used for large part assemblies with high strength and hermetic requirements. The process utilizes a controlled infrared light emitter which welds plastic assemblies by melting the joining surfaces which are then joined together and re-solidified under pressure.

Benefits of Infrared Plastic Welding

  • Fast changeover
  • No part or tooling contamination
  • Reduced amount of Flash

Hot Plate Plastic Welding


Hot Plate Plastic Welding is another process which can be used for large part assemblies. Heat is applied to the joint areas of parts for a predetermined amount of time, the parts are then removed from the heat source, and finally brought together and allowed to solidify under pressure.


Benefits of Hot Plate Plastic Welding

  • Compatible with most thermoplastics
  • Ability to weld large parts and complex shapes
  • Strong sealing method

Ultrasonic Plastic Welding


Ultrasonic Plastic Welding involves converting high frequency energy into a mechanical motion (vibrations) to create frictional heat in a focused area. The heat generated melts the plastic forming a molecular bond. This technique can be used for welding plastic to plastic, plastic to vinyl, and plastic to metal.


Benefits of Ultrasonic Plastic Welding

  • Flexible and versatile with little tooling changeover or fixture modifications
  • Consistent and repeatable
  • Very rapid weld time confined to the bonding or joint area
  • Can replace fasteners and adhesives

Additional Injection Molding Operations

  • Riveting and Staking
  • Foam and Acoustic Pad Assembly
  • Injection Molded Part Assembly