Related Sponsors

Thermoforming Processing Troubleshooting

Home » Manufacturing » Thermoforming » Thermoforming Processing Troubleshooting

Thermoforming can produce plastic parts that work well with certain industries. However, just as with any other manufacturing process, mistakes and errors do occur that result in defective parts or materials. When this happens a solution has to be drawn to eliminate the problem so the whole operation performs without a hitch.

There are many things to look at when trying to resolve problems with defective plastics. This list is large, but only the most important problems and possible solutions are provided below:

• Incomplete forming: Another of things could cause this problem. For example, the temperature of the sheet could be too cold. Also, there could be insufficient vacuum. Another factor is a cold clamp frame or excessive draw. To resolve this you need to check for a non-functioning oven heater. Or you need to increase heating time. You can always increase the heater temperature. This will ensure the plastic is chilled to the right temperature. If this doesn’t work, replace the heater. You can also check for vacuum leaks or holes in the hoses.
• Sheet pulling out: This can be caused by insufficient clamp area, or force, or uneven heating. The best way to resolve this is to increase clamp area and force. You can also check the heater in the clamp frame area to make sure it is working correctly.
• Bubbles, blisters, or pits: This can be caused by the sheet getting too hot or there is too much moisture. The best way to resolve this is by protecting the sheet with moisture barrier wrap, or by storing the sheet in low humidity environments. Or you can preheat the sheet.
• Plug Sticking: If you are using a plug in your process and it sticks too much, this could be the result of the plug getting too hot. If this is the case, reduce the plug temperature, or use mold release agent or lubricant. You can always cover the plug with wool felt or cotton.
• Part Cracking: After your part has been made, you take it out and notice it has cracked; this could be the result of high internal stresses or improve part design. The best way to avoid this is to increase sheet forming temperature. This will help make the part quicker. You can also increase the radii.

Next Page: Ultrasonic Cleaning Overview

Related Thermoforming Articles