internal cooling for the blow molding industry - Blow Moulding Controls

The temperature distribution in the production with an internal air cooling system was much better than that of a stagnant air process and
the mechanical tests have proven that all the physical properties of the product were much better as well. This was a good reason to test
the quality of the product in a lighter weight. The wall thickness of the preform was then reduced by 8.5% and the finished product
weighed 940grams [1.188lb]. The cooling time and the total cycle time were kept at 24 and 41 seconds.
The mechanical tests proved that the physical properties of the light weight product are as good as the initial properties of the product
manufactured with a stagnant air process and the car manufacturer approved the light weight oil cooler.
Follows is a financial comparison between the manufacturing with the conventional stagnant air process and the manufacturing with the
internal air cooling system after reducing the weight of the product:
Stagnant air process Internal air cooling system
Hourly machine cost 117.8 117.8
Personnel cost 51.8 51.8
Daily production hours 24 24
Product weight in grams 590 540
Resin cost per kg 1.85 1.85
Resin cost per product 1.09 1.00
Additional power for internal cooling in kW 7
Additional energy cost for internal cooling/h 0.18
Compressed air consumption in m³/h 64.91
Compressed air cost/h 1.95
Manufacturing cost /h 234.02 260.75
Daily manufacturing cost 5,617.00 6,258.00
Daily number of products 1,416.00 2,107
Manufacturing cost per product 3.97 2.97
Daily profit related to internal cooling 2,107.00
Investment in internal air cooling system 70,000.00
Amortization in days 33.22
The internal air cooling system improved the quality of the product and the pay
back time was only 33 days.
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