Rigid PVC sheet wavy edges
Rigid PVC sheet wavy edges
(OP)
Hi everyone,
I'm new to this forum and hopefully it will help me to find some answers.
We try to produce PVC sheets for wall covering but we have an issue of wavy edges.
When the sheets come out the line and are stacked they are perfectly flat but after hours and sometimes days (it seems to depend of the ambient temperature), waves appear on the edges of the sheets. Sometimes more on one left side of the sheet but others, the same on both sides.
Do you have an idea of what could cause this?
I've posted a link for you to see a picture and have an idea of what I'm talking about.
Thanks for your answers.
Vincent
I'm new to this forum and hopefully it will help me to find some answers.
We try to produce PVC sheets for wall covering but we have an issue of wavy edges.
When the sheets come out the line and are stacked they are perfectly flat but after hours and sometimes days (it seems to depend of the ambient temperature), waves appear on the edges of the sheets. Sometimes more on one left side of the sheet but others, the same on both sides.
Do you have an idea of what could cause this?
I've posted a link for you to see a picture and have an idea of what I'm talking about.
Thanks for your answers.
Vincent





RE: Rigid PVC sheet wavy edges
RE: Rigid PVC sheet wavy edges
B.E.
You are judged not by what you know, but by what you can do.
RE: Rigid PVC sheet wavy edges
We tried not to cut the edges online. we left the sheets with the edges to cool down but the waves appeared anyway...
But we did not consider the moisture factor.
Thanks for your answer
RE: Rigid PVC sheet wavy edges
We have a device to control thickness across the sheet. I'm not saying that they are perfectly constant but I would say that thickness vary between 1.75mm and 1.9mm.
and the edges often are thiner than the center.
Thanks for your answer
RE: Rigid PVC sheet wavy edges
RE: Rigid PVC sheet wavy edges
I am not talking thickness, I am talking linear distance. The same problem occurs when metal sheets are formed.
The makers of metal sheets get around this by stretching the sheet by differential roller speeds to even out the tensions across the sheet. Whether you can do this with PVC sheets I do not know.
B.E.
You are judged not by what you know, but by what you can do.