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As Ravi said , PET plants do switch between different grades ( Bottle grade, textile grade, film grade) so many be you received a change over lot.
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P.S. If your using PET from GATRONOVA (www.gatronova.com) you can expect the unexpected. :-p
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We would like to ask your esteemed company
Showing your price
Brefum
Measuring liter and a half
Weight of 45 grams
Measuring bottleneck 33
I hope that you accept us we are a factory for plastic eye every deep respect and appreciation
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Comments by Mr. Tajdar Khar are relavent on resin front.
You may also try increasing your drying tempetatures, processing temperatures, increase cushion (material in barrel at the end of injection storke). If nothing yields then the resin could be from a swing plant which produces textile chips and PET bottle grade chips. If so, TiO2 present in textile chips (left overs) could be the reason. If you can name the resins, it is possible to put some opinion.
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Hey can i know the names of the companies
try getting their COA (Certificate of analysis) this haziness of pet is due to its chemical composition. Low level of IPA ( Iso phathalic Acid ) causes this haziness
in fact IPA is added with combination of PTA ( Phthatalic Acid)to reduce PET Tg and better preform quality.
U can also try low chilled water temp and low cycles if ur machine is equipped with a post cooling system.
if i cud be of any assistance do ask.
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We have two kind of PET resin made by two different companies and we use them in same condicion but one of them is more opaque than the other .WE change also the oprating condition to solve the problem for this kind of resin but never the transparency of it is like the other.Do you think what is the problem of the resin and how the producer can solve the property of it.
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