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 - Content
Search - People/Events
Search - Forums
Search - Newsfeeds



jobcenterbanner

FacebookLinkedinPinterestYoutube
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: Cable crack

Cable crack 2 years 6 months ago #419

Hi,

I plan to run a black MDPE jacketing compound. I have produced the compound with 70% HDPE + 24% LLDPE + 6% Carbon Black masterbatch. My potential customer has manufactured a low voltage cable using the compound and found the cable to crack.

Please suggest any reason why this occur? Anything to do with the formulation? The Shore "d" hardness is found to be in HDPE category (62) instead of MDPE category. Does this have to do with the extra content of HDPE or non- uniform mixture occurring?

Any suggestion or help would be great.
The administrator has disabled public write access.

Re: Cable crack 2 years 6 months ago #420

There are many reasons why a cable jacket can crack including poor processing at your customer's plant. If indeed you are sure that this is your problem as the plastics compounder (In a tropical country.) then I would first suspect poor mixing. If that doesn't resolve the problem then abandon the linear low density polyethylene in favor of low density polyethylene and see if that resolves the issue. Hopefully you have a laboratory where various mixtures can be tried and assessed.

Regards
Peter J. Stewart-Hay
Principal
Stewart-Hay Associates
www.Stewart-Hay.com
The administrator has disabled public write access.

Re: Cable crack 2 years 6 months ago #421

(Question 1) When mention about poor processing at customers’ plant, is it got to do with the processing temp./ pressure? Or others? At this stage, I agree it should be poor mixing as we are still in the R&D phase for the compound.

(Question 2) Would you suggest any equipment that can perform for this mixing? Thank you for the suggestion.

(Question 3) Are there any reason LDPE could be a better resin than LLDPE for this case?

(Question 4) Why is it that the problem is more significant in a tropical country? Weather?

Thanks
The administrator has disabled public write access.

Re: Cable crack 2 years 6 months ago #422

Response to Question 1
Poor processing at your customer's plant.
First of all, you have told us zero about the cable other than it is low voltage and that the sheath is cracking. We don't even know how the cable cracked (Radially or with longitudinal splits.) Perhaps there is a metallic shield under the sheath and that was incorrectly formed and thus protruding almost completely through the sheath. Moreover we have no idea if your customer used the correct tooling and cooling procedures. Similarly we have no clue as to when the cable jacket failed. Was it during dereeling and was the full reel sitting out in the sun for a long period of time first? For all we know, this cable has much air space inside it and perhaps your customer applied the jacket eccentrically so that there is a extremely thin wall on one side of the cable.
We cannot see what you see or what is happening on the other side of the planet. Moreover, we do not read minds.

Response to Question 2
Improving your mixing process.
How can we recommend improving your mixing process when we have no idea what you are doing now? You must really do your own development at your plant. There are of course a number of very good machines available for mixing plastics.

Response to Question 3
Medium density PE from LDPE and HDPE mixed together.
I have quite a lot of experience processing compounded mixtures of high density polyethylene, low density polyethylene and a foaming agent properly mixed and pelletized to produce a high quality, medium density, cellular polyethylene compound. This compound worked well for us for many years. You might be having a bit of a problem properly mixing linear low polyethylene and high density polyethylene. I expect it will be easier for you to stop using LLDPE in favor of LDPE in this instance. Prove me wrong!

Response to Question 4
Tropical Country.
In general I relate polyethylene sheath cracking with cold climates and thus I was trying to make the point that sheath cracking in a tropical country is very unusual, at least to me.

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