How to Control Loss in the UPVC Extrusion Process
                     
How to Control Loss in the UPVC Extrusion Process
You can detect many defects like surging; melt fracture, 
degradation, voids, gels and specks in the profile extrusion process 
leading to the maximum amount of waste. Using purging material 
from reputed manufacturers can help to control loss in the UPVC 
extrusion process.
If you look at the UPVC profile manufacturing industries, you will 
notice a substantial amount of waste during the manufacturing 
process. There are different noticeable defects like surging, melt 
fracture, degradation, voids, gels and specks etc. Some of the 
causes can have a link to the raw material used. It happens when 
the raw material is not up to the required specification. Even if all 
the extrusion parameters have ideal maintenance, you can notice 
that the manufactured products have a different look, bend, colour 
or texture. Though it may seem unscientific such problems happen 
on the production floor. As extrusion is a high-volume 
manufacturing process, such defects can lead to substantial scrap 
and time-consuming shutdown.
If you desire to reduce escape and time-consuming shutdowns, it is 
wise to use purging material purchased from reputed 
manufacturers.
The way to avoid significant flaws using purging compounds
As told earlier, you can notice surging, melt fracture, degradation, voids, gels and specks etc. 
Each of these defects can have avoidance using purging material for injection moulding
. Let us see how it is possible.
Surging
We call it surging if we notice a cyclical variation in product thickness in the extrusion 
direction. The surge cycle can typically last 30 seconds to 3 minutes, and the cause can be 
internal or external. It is easier to notice the external causes and rectify those. However, the 
defect is due to internal components if you do not see any such symptoms leading to 
external causes. It is sometimes possible to cure such defects by raising the temperature of 
the feed to promote earlier melting. However, raising the temperature may sometimes tend 
the pallets to stick to the walls and increase the rejection rate. Instead, if you use purging 
compounds made by reputed manufacturers, it will be possible to pull out the break-down 
UPVC material fractions and have a clean frictionless surface.
Melt fracture
Melt fractures are the fine ridges or rough surfaces noticed when the melt comes out fast 
from the narrow die. It commonly happens when the material happens to experience 
excessive shear of friction at the die lip. Using mechanical grades from reputed 
manufacturers can pull out the hard layer developed due to the raw material shear and 
molecular degradation.
Discolouration
Overheating may limit the rate or produce 
degradation making dimensional control and sizing 
difficult. If, in such conditions, you use 
purging material of reputed make, possible to 
operate at a low processing temperature will help in 
eliminating burnt materials without raising the 
temperature, which may cause costly rejections.
About the author
If you desire to have such purging compound and 
purging material for injection moulding, it is 
wise to contact UNICLEANPLUS. You can contact 
them at +91 9021232809 for free samples or have 
the latest information on effective purging 
compounds.
Contact
UNICLEANPLUS
Lesliganj, Jharkhand, 822118, India
Phone: +919021232809
Website: https://www.unicleanplus.com/
Email: [email protected]
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