The Guide to Bend Polycarbonate sheet

2020-01-15 11:31:17 FOSHAN DAFU NEW MATERIAL CO.,LTD Read

1579059148313584.png


The Guide to Bend Polycarbonate sheet

Here are some basic steps, tools and precautions to help you bending polycarbonate sheet.

  1. For Cold Line Bending

    1579059471352720.png

A polycarbonate sheet can be bent without heating, However you need to consider sheet thickness, angle of bending and the tooling for the best results. 

We recommended that:

1) The operator uses tools with sharp edges

2) The operator allows plenty of time after bending, say one or two days.

3) The operator doesn’t force the sheet into the desired final form or reduce the bending angle during installation.

4) Overbending may be required, to overcome the effect of springback, the attempt by the bent polycarbonate to revert to its original position.

5) The operator attempts cold line bending on a sample piece before committing a larger piece.


Once satisfied with the test run on the sample piece, cut the sheet to its pre-bending size.

Then give the edges a smooth finish, to eliminate the possibility of a crack forming from the bend line.

The sheet is then bent rapidly, with the protective film still in place in most cases.

Now, to ensure that the bend maintains the desired angle after springback, the sheet should be bent 20-40o larger than the desired angle.


NOTE: 1-Cold line bends usually do not exceed 90o, as this may exceed its elastic limit.

2-This technique isn’t recommended for polycarbonate variants that are hard coated, or even UV-protected.It is because this type of bending will likely weaken the efficacy of such additives along the bend line.


2.Break Bending Polycarbonate

微信图片_20200115112219.png

Brake bending is a technique that uses a device known as a press brake to alter the sheet into the desired final form.

The press brake has a long history of use in shaping sheet metal.

And, the relative flexibility of polycarbonate sheets, which can be bent to a limit without breaking, has allowed the transfer of this technology in the processing of polycarbonates.

       It can be divided into:

· Manual Press Brake---clamp the sheet in place, uses levers to move the equivalent of the punch, to cause the sheet to bend.

· Hydraulic Press Brake---the electric hydraulic press moves downwards at a predetermined force to bendthe sheet.

· CNC Press Brakes---CNC brakes are easily programmed a shape via a screen attached to the system which was controlled by a computer numerical controlled system.


In brake bending, it is recommended that one performs the operation very fast.

Of course, this is to compensate for springback – you should overbend the sheet.

It is not advised to bend flame-retardant variants of polycarbonate sheets as this may compromise their quality.


3. Bending Polycarbonate Sheet with a Heat Gun


1579059779874217.png


Firstly needs a vice/clamp to hold the sheet in place and a heat gun then operator can force to move the heat gun constantly along the bend line and flip over the polycarbonate sheet to ensure both sides get heated.

Pls noted that because using heat gun benfing will cause uneven heating and occur bubbles along the bend line that will affect the durability of the polycarbonate at the bend site.