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Kenplas Forum ==> Blow Molding (Machine) ==> PET bottle blowing
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i have a problem with the expansion of the bottle and perhaps CO2 missing how can i do to mantain the CO2 value for more time, we have a resin higer than .8 dl/g, blowing temp 106, pressure 14 and 38 bar

regards
danny

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3/25/2007 2:52:01 PM By Danny
how the co-polymer level in PET resin causes intermediate fold or crater generation either top or bottom while reheat blowing specially in 5 gallon bottles.

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8/25/2006 7:05:13 PM By Chandranath Dutta
HELLO VACE,
OPTIMAL BLOWING TEMP.IS JUST ABOVE THE TEMP.WHERE PERLESCENCE APPEARS ON THE BOTTLE.FIRST YOU CHECK THE BLOWING TEMP.AT WHICH PERLESCENCE APPEAR & THEN RISE UPTO 2-3DEG.C. MORE

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1/16/2006 4:37:28 PM By ANWAR SHAHID
Dear Vace,

The temperature should be in the range of 95 to 110 deg.
Please check the preblow pressure and speed of the stretching.

And please tell in details which problems do you have while blowing and can be sorted out one by one.


With regards

Amol
+919890231324

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12/5/2005 3:42:40 PM By amol dixit
please tell me how you will solve for when the neck of a preform breaks it eject from the mold and some scratches on the preform and at times it shrink,

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10/24/2005 11:26:58 PM By HENRY ADJEI
I wiii like to request for your explanation and analysis of the design and construction of mould for plastic kitchen spoon

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7/23/2005 6:49:26 AM By ELEGBEDE OLUSEYI
Hello,
Vace,

110 115 C would work well, depend on moisture content of preform, if high than gradually go bellow 100 C

Joseph

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6/22/2005 10:54:12 PM By Joseph
My experience tells me that you should be working with a temperature 20 Celsius degrees over TG at least and never exceed 45 Celsius degrees over TG.
So, it would mean from 85 to 110 Celsius degrees as general range.
It doesnt depend on weight of preform, but mainly on temperature of internal part of preform. Keep in mind that stretch ratio of internal area of the preform is higher than external. So, ideally, you should have a higher temperature inside the preform than outside.
This is the reason why we use a blower cooling the preform while IR lamps are heating them. This is meant to reduce the difference of temperature across the preform wall. This diference, if too big, causes different stretchs ratios and damages the bottle.
Best regards,
Mauro Bueno

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6/22/2005 10:53:35 PM By Mauro
Dear Sirs
I''m a beginner at PET bottle blowing.
What is the optimal blowing temperature for PCO preform 42 gm (HOPET resin)?
Thanks in advance. Vace Bernatsky,Ukraine

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6/22/2005 10:53:04 PM By Vace
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