How to Control Loss in the UPVC Extrusion Process

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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.

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• 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.

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• 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.

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