How to Make a Strip Heater for Forming Acrylic Sheet - BriskHeat

How to Make a Strip Heater for Forming Acrylic Sheet


Quickly soften acrylic sheets for easy bending, Plastic photos frames, Arts and crafts, Custom work shop fabricating


Instructions for Strip Heat Forming Acrylic Sheet


Note: Bending material before it is thoroughly heated will result in stress crazing (small internal fractures along the bend) Practice on scrap material first. Acrylic sheet in thickness greater than 1/4” should not be strip formed.

Do not leave strip heater unattended. Work in a well-ventilated area. Have a general purpose ABC rated (dry power) fire extinguisher nearby. Do not heat acrylic sheet with an open flame or in kitchen ovens—such ovens are not equipped with adequate temperature controls and safety devices for this type of work.

Materials Needed

  • BriskHeat RH Plastic Bending Strip Heater (BH Thermal Strip Heater) Element - buy now
  • Fiberglass Cloth
  • Heavy Duty Aluminum Foil
  • ¼” Plywood Strips
  • ½” Plywood
  • Grounded Wire

Instructions


  1. Cut a piece of 1/2” Plywood (Refer to char below)
  2. Cut two 1/4” Plywood Strip (Refer to chart below)
    Center the two strips (2) on top of the base (1) leaving a 3/4” channel down the center and nail to the base.
  3. Cut two pieces of heavy duty aluminum foil (Refer to chart below) and fold to fit in the 3/4” channel
  4. Attach a ground wire to the aluminum foil with a screw as shown.
    Note: The ground wire should be long enough to attach to a common ground such as the corner plate screw on an electrical outlet.
  5. For insulation, use fiberglass cloth (Refer to chart below) and fold to fit in the 3/4” channel on top of the aluminum foil.
  6. Staple fiberglass cloth and aluminum foil to 1/4” plywood strips (2) along the outside edges.
  7. Tape edge of fiberglass cloth and foil down to sides of wood to prevent fraying of edges.
  8. Lay the BriskHeat Strip Heater Element in the channel.
  9. Drive a nail 11 1/2” from each end of the base along a center line and tie end strings of the heating element to the nails.
  10. Attach ground wire to common ground
  11. Plug the strip heater into 110V outlet.
Acrylic sheet may be formed along a straight line by strip heating. Remove protective masking paper. Place acrylic sheet on the supporting frame with the area to be formed directly above the heating element—do not let the sheet touch the heating element. The material could not be heated to a temperature higher than 340°F. Surface overheating will cause scorching and bubbling; if this occurs, increase the distance between the heating element and the sheet. Allow the material to heat thoroughly (until it softens or welt in the area to be formed). Bend gently to the desired angle, keeping heated side of the material on the outside of the bend, and hold firmly until cool.

Briskheat Strip Heater view

How to Build a Plastic heat Bender, Video By: http://www.tapplastics.com