Sanitary sheet
  • Sanitary sheet
  • Sanitary sheet
  • Sanitary sheet
  • Cho Chen Sanitary sheet accounts 80% of Taiwanese bathtub market, 

    ● Suit a variety of thermoforming methods

    ● Wide range of available colors

    ● Resistance to many household chemicals

    ● Size: up to 2050 * 3050 mm; Thickness: 2mm ~ 6mm

1. Forming Temperature
The normal temperature for forming acrylic sheet is about 160 degrees ~185 degrees (320F~365F), however if the part being formed has small sharp radii, it may be necessary to raise the temperature step by step to a maximum of 200 degrees (392F) providing the sheet has not been exposed to moisture or high humidity.

2. Heating Method
Regardless of the type of oven used, forced air or electric infrared, it is important to raise the sheet temperature step by step. Only when the entire sheet is heated thoroughly that is the top, middle and bottom to a consistent forming temperature , it is permissible to form the sheet.

2-1) Forced Air Circulating Oven
Since a fan evenly distributing the heated air throughout the oven, you can get good uniform forming temperatures.

2-2) Electric Infrared Oven
In the use of this oven for mass production, some problems may occur. The following are some of these problems and possible preventative measures to take.

a) The difference in temperature, particularly in a thicker sheet, between the surface and the core of sheet during the heating or warming up. This problem can cause over-heating on the surface and mis-forming because the core is too cold. The solution to this problem is to lower the voltage and heat the sheet more slowly.

b) The outside circumference for the sheet will not get enough heat. This may be caused by the clamping device cutting the infrared ray and transferring the heat away from the sheet into the metal causing the sheet to stretch unevenly resulting in thin bottom radii. The solution to this problem may be two-fold.

3. Cautions

Please keep in mind following special properties of acrylic sheet when you heat it.

3-1) Sheet shrinkage due to heating
Cast acrylic sheet shrinks about 2 degrees after the first heating. When you cut a sheet, it is necessary to consider the sheet shrinkage and to have some allowance depending upon your choice of forming method and shape of formed products. With a forced air circulating oven special care should be taken in sheet size selection. Due to the fact that you must heat the sheet without clamping.

3-2) Bubbles or blisters due to over-heating
Different colors react to heat differently. Some colors are more easily overheated to the point of bubbles or blisters. In addition leaving acrylic sheet uncovered and open to moisture will cause the bubbles to appear at a lower temperature. Acrylic sheet is hydroscopic and absorb moisture. Please keep stored in a dry warehouse leaving the polyethylene film attached until just prior to putting into the oven.