Simple Air Roll to Elastic Cooling Roll

Simple Air Roll to Elastic Cooling Roll

 Air roll was developed about 20 years ago.
It was very simple structure.  The outside is a metal sleeve and inside air pressure is kept.
It has metal surface, yet possess elasticity like rubber.

Test unit to compare  "rigid cooling roll (front)" and
"elastic cooling roll  with a chiller (back)"

However, requirements are getting higher and more difficult in production of plastic sheets and films now.  
To this needs DYMCO succeeded to set a rubber roll inside the metal sleeve so that the air roll can stand different pressure.

Popular rigid rolls, their thickness is 7 to 8mm, very thick.
The metal sleeve thickness of our elastic rolls is only 0.2 to 0.3mm.
Thin surface brings superior heat transfer efficiency.
Also with nipping by thin metal, contact surface between the roll and film becomes wider.
All these contribute to cooling efficiency.  
We see a possibility that the cooling line becomes shorter.

For details, please contact us.

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DYMCO, LTD. URL: http://www.steelbelt.jp

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Aug. 16, 2017 Metal Flexible Roll and Air Roll

There are 3 types of metal flexible rolls:
Air Pressure Type,
Coolant Circulation Type, and
Air Pressure Type with Backup Rubber

These are all Dymco original.
Either of them works with the metal solid roll.
Melted plastic material goes down from T dai and falls between the metal flexible roll and the metal solid roll.
Then, plastic material is pressed by the nipping surface created by this flexible roll.
Due to the flexible roll the nipping surface is created.
If two rolls are both solid metal rolls, they make line touch only, not nipping surface.

Air Pressure Type is made by the outer thin metal sleeve, one shaft and sides.  As air exists between the outer sleeve and a shaft, this roll is very ligh and gives moderate presure on films.

The outer sleeve is Nickel.  We find little defects on its surface and its hardness is higher than the ones in this industry.

Structure of Air Pressure Type Flexible Roll

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   DYMCO, LTD URL http://www.steelbelt.jp