With a simple plastic strip heater it is possible to create professional shelves or other fixtures from acrylic material. In this instance, the material used was 1/4" thick clear acrylic, which is about the maximum thickness possible to bend with a low cost strip heater. The shape should be cut out along with any screw holes for mounting prior to the bending process. In preparation for the bend, unroll the strip heating element onto a flat, heat resistant surface and plug it in. It will take several minutes to warm up. Once hot, you may begin.
Step 1: Cover the heating strip with a layer of thin paper. This will keep the plastic from adhering to the strip and causing imperfections in the surface. The manufacturer of the plastic strip heater suggests placing the material underneath the heating strip, but we find that it is more effective if the material is placed on top of the strip, as it heats more effectively. With the heating strip covered with the thin paper, rest the material across the heating strip along the axis of the bend. It can be helpful to lightly mark this axis before beginnng. With this project, the bend axis was marked with a light vector etch. Once the material is resting on the heated strip, it will take anywhere from five to thirty minutes to become ready to bend, depending on the thickness of the material. 1/4" material will require the full thirty minute time period.
Step 2: After the appropriate amount of time has passed, the material will be flexible along the bending axis. You will need to use a dull, straight edged object to assist with the bend. In this case we used a wooden ruler, which was quite effective. Place the object along the bending axis and apply firm pressure downward. With your other hand, pull the top of the material up to the desired angle. If there is too much resistance, the material is not completely heated and will shatter or produce a poor bend. If there is much resistance, allow the material to re-heat for several more minutes.
Step 3: Hold the bend in place at the correct angle and remove from heat. Keep on a flat surface.
Step 4: Continue to apply pressure and hold the correct angle for thirty seconds to one minute, or until the bend has solidified and the material is rigid. Once cooled, the bend is complete, and the part is ready for use, or for additional bending.
