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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Web handling low inertia roll

As a variety of plastic films are developed for wider applications, thinner films are  being produced.
In these production, demand for lower inertia becomes apparent for feeding rollers.  Here we ntroduce our low-inertial roll.

 １．Structure of the low inertial roll
This roll is made up by the core roll and theouter sleeve. Its uniquness is that the core roll does not rotate.  Air goes in from the edge of the core roll axis and goes out of holes along core roll surface.  Due to this air flow the outer sleeve sweels and there appear clearance between the core roll surface and the outer sleeve.  Then the outer sleeve only begins to rotate, free of any resistance.

The outlook of the low inertia roll:  The outer surface is thin metal sleeve.  This sleeve only rotates.  The blue right end is the air inlet.

 ２．Conparison of inertia with the conventional web handling rolls

The right one is the conventional roll.  This is made by steel, 1200mm long, diameter 100mm, thickness of the roll area is 6.0mm.  The left one is our low inertial roll, 1200mm long, diameter 100mm, thickness of the outer sleeve is 0.125mm.  When inertia of our roll is 1, inertia of the conventional roll is 48.   

 ３．Effects of the low inertia roll
 The big benefit is improved production effectiveness by film conveying speed increase.  In general, when the roll diamer is long and weight is heavy, inertia becomes larger.  Also there appear speec difference between a conveyed film and roll rotation speed.  So there is limitation in film conveying speed.  Our roll is made up by the thin and light outer sleeve.  This light sleeve can follow the film speed, which increase speed of the entire line.

 

Other merits are 'being clean' and scratches become less due to lower stress between the roll and a film.





 

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