make up natural cara make up make up tutorial make up korea make up minimalis make up artis make up mata belajar make up make up wardah alat make up makeup forever indonesia makeup artist jakarta tips make up barbie make up natural make up make up wajah make up pesta make up syahrini makeup mata makeup minimalis peralatan make up make up cantik make up mac make up kit jual make up make up sederhana perlengkapan make up gambar make up vidio make up cara makeup minimalis wardah make up make up pac make up glamour cara memakai makeup make up panggung harga make up make up modern make up alami make up dasar pixy make up make up muslimah make up oriflame make up jepang makeover cosmetic make up ultima make up sariayu grosir make up makeup fantasi makeup pesta tas makeup langkah make up make up pria make up malam alat makeup tahapan make up produk make up shading make up mak up make up kebaya make up jilbab make up inez make up simpel contoh make up cara ber makeup makeup wajah tanpa make up make up terbaru toko make up mac makeup indonesia make up soft urutan make up trik make up makeover makeup brand gusnaldi make up paket make up panduan make up jual makeup brush make up bagus alat2 make up make up gusnaldi aplikasi make up alat alat makeup dasar make up inez make up peralatan makeup make up wanita make up berjilbab make up tebal sejarah make up make up maybeline make up branded make up siang tata cara makeup reseller make up make up muslim make up maybelin warna make up tips make up artist rias make up make up mata make up artis belajar make up make up artist kursus make up kuas make up make up forever indonesia jual make up mac indonesia make up make up artist indonesia harga make up forever jual make up online make up pac make up forever jakarta make up oriflame jual make up forever make up online shop indonesia harga make up sekolah make up grosir make up harga make up maybelline jual make up murah make up terbaru mak up mac make up indonesia sofia make up make up kit murah mac makeup indonesia produk make up jual make up kit make up store indonesia make up forever academy jakarta toko make up online jual make up set jual make up mac make up beauty jual make up branded produk make up mac make up forever harga make up mac indonesia produk make up artis jual make up palette produk make up forever make up palette murah before after make up pengantin before after make up sendiri before n after hasil makeup contoh make up karakter contoh riasan pengantin before n after harga make up wisuda harga make up artist harga make up forever make up wisuda rias wisuda di jogja Daftar harga make up forever daftar harga make up mac daftar harga kosmetik make up forever makeup wisuda harga makeup wisuda kursus make up di yogyakarta kursus make up di jogja kursus make up jogja kursus make up yogyakarta kursus kecantikan di yogyakarta kursus kecantikan di jogja kursus make up artist di jogja kursus rias pengantin di jogja kursus rias di yogyakarta kursus tata rias di yogyakarta rias pengantin muslim jogja jasa kreasi jilbab wisuda yogyakarta jasa rias make up wisuda murah bagus bisa dpanggil tempat make uf di jigja yang bagus rias wisuda murah dan berkualitas yogyakarta pakar kreasi jilbab di jogja make uper natural yogya make up wisuda hijab area jogja make up dan kreasi jilbab yang bagus di jogja jasa make up natural untuk wisuda jogja makeup jogja make up jogja makeup yogyakarta make up yogyakarta makeup wisuda jogja make up wisuda jogja make up wisuda yogyakarta makeup wisuda yogyakarta
Search - People/Events
Search - Content
Search - Industry
Search - Forums
Search - Newsfeeds


Welcome, Guest
Username: Password: Remember me
If you have a question regarding coaxial, telephone, and building wire, power cable, insulation, extrusion, bunching, stranding, braiding, etc. post it here.

TOPIC: Contaminant

Contaminant 2 years 8 months ago #423

Dear all,

I am a low voltage XLPE compounder. I am running black and natural color for the compound. Every time when my production machine swings from black to natural compound, I have to use out about 300 - 400kg of virgin material to purge the black/ contaminated. Even though the natural compound looks white, there are still some contaminants in the products.

Can I ask if anyone has a remedy for this? Your help will be very much appreciated.
The administrator has disabled public write access.

Re: Contaminant 2 years 8 months ago #424


There are certain facts of life that are hard to get around and I expect this is one of them. Since you are manufacturing low voltage XLPE, I imagine you are purging the compounding extruder with natural polyethylene containing no organo-peroxides at all. This suggests that there is no or very little peroxide bearing polyethylene in the purged compound once the majority of the compounded black XLPE polyethylene is captured and discarded. It may then be possible to capture and regrind the remaining "gray" polyethylene in say a hot melt granulator and that this material could then be proportionally fed into the next run of the black XLPE formulation. The danger of course is that some larger concentrations of peroxide bearing polyethylene could go through the compounding extruder a second time and result in precured or already crosslinked contaminants in the finished compound. Other contaminants such as plant dirt and foreign materials could also be a problem. This will depend on operator/ process engineering expertise, the sophistication of your compounding extruder, plant cleanliness and local specifications. You may wish to discuss this further with the compounding extruder manufacturer.

Kindest Regards,
Peter J. Stewart-Hay
Stewart-Hay Associates
The administrator has disabled public write access.

Re: Contaminant 2 years 8 months ago #425

Further from Contaminant

I have faced the same problem as well. I have been using virgin material to clean up the compounding extruder for years. I have been told that I can either add in purging compound or processing aids (PPA) to do the cleaning. I would like to ask what are the difference and advantages between purging compound and processing aids in terms of the quality of the product."

:: :: :: :: :: :: :: :: :: :: :: :: :: :: :: :: :: :: :: :: :: :: :: :: :: :: :: ::

I am neither a chemist nor chemical engineer so the following are strictly my personal opinions:

"Purging Compounds and Polymer Processing Aids (PPA) are just one more material to purchase and use in the hope that one will get a faster clean out and thus use less material. My experience with extruders that pump thermosetting and thermoplastic polyolefin compounds is that these extras are not justifiable in terms of saving money. Moreover, the common PPA compounds on the market are fluorinated, expensive and environmentally harmful. Instead I suggest that one use a natural polyethylene thermoplastic compound to clean out the extruder but continuously vary the extruder speed to "scrub" the screw and barrel so to speak.

Others may have different opinions and I would very much appreciate if they are posted on this Forums thread.

:: :: :: :: :: :: :: :: :: :: :: :: :: :: :: :: :: :: :: :: :: :: :: :: :: :: :: ::

Extracts from a Presentation Titles - Processing Aids in Extrusion of Polyethylene
By: M.H. Wagner (1), M. Müller (1), O. Kulikow (2), K. Hornung (2)
(1) - Technische Universität Berlin, Polymertechnik/-physik
(2) - Universität der Bundeswehr der München, Luft- und Raumfahrttechnik

Polymer Processing Aids (PPAs) are often used improve extrusion flow instabilities in LLDPE and metallocene PE such as melt fracture and this is often referred to as "snakeskin".

Metallocene Polyethylene (mPE)
• mPE is a new development which is of special interest because of narrow molar mass distribution:
• Polyethylene made from metallocene catalysts is tougher, stronger and cleaner than resin made from conventional catalysts
• The film manufactured with metallocene PE offers down-gauging opportunities to reduce costs and environmental pollution

Typical Polymer Processing Aids (PPAs) are:

a) Fluorinated PPAs:
• "Viton FreeFlow™" - DuPont
• "Dynamar" - Dyneon (3M)
• "Kynar " - Atofina Chemicals
• "Metablen A" - Mitsubishi Rayon Co., Ltd.

b) The use of less than 500 ppm of thermoplastic elastomers:

• "Elastollan" – Elastogran
• "Baymod“ – Bayer

C) The usee of less than 500 ppm Silicone Elastomers

• TPSE“ – Wacker Chemie

Kindest Regards,
Peter J. Stewart-Hay
Stewart-Hay Associates
The administrator has disabled public write access.
Time to create page: 0.280 seconds