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Thermoforming - Spencer Industries Incorporated
Society of Plastic Engineers Thermoform Awards
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Twin Sheet Thermoforming -

Twin Sheet Thermoforming is accomplished by heating two extruded plastic sheets simultaneously and then forming and sealing or fusing these two sheets together during the thermoforming process. In many cases, the twin-sheeting process produces parts that can resemble a blow-molded or rotational molded product, but with several advantages.

Advantages and Features of Twin Sheet Thermoforming

  • A two-color product option
  • Ability to have 2 different material thicknesses
  • A higher esthetic product because of complete tool contact of both exterior sheets
  • A hollow product with a separate component trapped inside the two sheets as the part is being twin sheet thermoformed.
  • Allows a parting line that varies in locations around the perimeter of the two halves
  • Increased Structural Integrity and helps Rigidify otherwise weak areas
  • Multiple Materials that we commonly Twin Sheet Thermoform - HIPS, ABS, TPO, HDPE, PP, TPU, & PETG
  • Size capabilities range from as small as 8" x 8" to as large as 7' x 11' x 36" Depth

  • Hollow Formed Parts
  • Two Color Part Option
  • Foam Filled
  • Living Hinge Capabilities
  • Custom Color Layering
  • Variable Wall Thickness
  • Multi Textures
  • Air and Wiring Ducting
Twin Sheet Thermofored Collage


Twin Sheet Living Hinge Door
Innovative Living Hinge Roll-up Door

This door was designed using our twin sheet thermoforming method with a living hinge to reduce hardware cost and assembly. Doors can be made up of as many panels as required depending on the various truck heights. The living hinge door is made from TPO material. This door has been rigeriously tested to extreme temperatures and environments, and has proven it could last a lifetime.

Click here for more information on our Living Hinge Roll-up Doors



We have won several Society of Plastics Engineers Thermoforming awards.
Click here to see some of our Twin Sheet Award



Twin Sheet Plastic Product Collage



Twin Sheet Plastic Thermoforming Product Gallery



Point of Purchase Plastic Products
Twin Sheet Coke Bottle
Our Twin Sheeted Coca-Cola Bottle produced in HIPS material. This bottle stands 6 feet high, and is filled with foam for thermo-insulation.

Injection Foam Filling of our Twin Sheeted thermoformed components is another unique ability we have.
Tanning Beds
ABS Plastic Shroud and Base Covers

6' x 6' with many installed threaded nut-serts

Twin Sheet Formed Tanning Bed
Twin Sheet Thermoformed Car Garage Door
This storage Hut Door is twinsheeted ABS with our in-mold triming process. The door stands 6 1/2 feet tall x 4 feet wide.
HDPE Plastic Living Hinge
Living Hinge -Plastic
Refrigerator Door-In-A-Door Open Refrigerator Door-In-A-Door
Door-In-A-Door Refrigerator Door - ABS w/Centrex
Twin Sheet Formed w/Inmold Trim, Before two halves are fused together a robot inserts an injection molded hinge, part is foam filled and has multiple sub assemblies

Twin Sheet Toshiba Projection TV Backing Plastic Toshiba Projection TV Inside
Projection TV Back Covers - HIPS
W/multiple sub assemblies and actuated undercut handles

Twin Sheet Camping RV Camper Trailor

RTV Camper / Command Post - TPO

9 TPO Twin Sheet Parts, All panels have multiple hardware assemblies

Large Twin Sheet Panel
Semi Wall Panels - ABS
ABS Twin Sheet Wall Panels with in-mold Triming, and injection foam filled
Twin Sheet Mobile Air Compressor Body Housing
Mobile Air Compressor - TPO

4 TPO Twinsheet Parts, All panels have multiple hardware assemblies
Twin Sheet Exercise Stepper

Exercise Stepper Back Cover - HIPS
Back Cover is 23" Deep




For further understanding of the thermoforming and twin sheet processes, please reference the "Forming Capabilities" section of our web site.




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