FAQs
Below are some common questions regarding
RHL products and processes. If you still need help, please
contact us.
- Cover Material Specification
Can RHL assist with cover material specification?
- Yes, RHL have extensive experience of calendering applications and can assist with cover material specification. RHL are happy to review your application to advise the optimum cover material.
- Syncast™ Polyamide Rolls
Can Syncast polyamide sleeves be fitted over existing fibre covered rolls?
- Yes, for many textile calendering applications and embossing applications, RHL’s Syncast sleeves can be fitted over the existing fibre covering avoiding the high cost of new roll shafts.
- Grinding Services
Do RHL offer roll grinding services?
- Yes, RHL offer roll grinding service for many roll types including fibre covered rolls, rubber rolls, PU rolls and steel rolls. RHL can accurately grind cambered profiles.
- New Fibre Covered Rolls
Do RHL produce complete new fibre covered rolls?
- Yes, RHL regularly manufacture complete new fibre covered rolls for both end users and many of the world’s leading calender manufacturers.
- Polymer Rolls
Do RHL supply Polymer/Composite rolls for Supercalendering?
- Yes, RHL have recently introduced Diamantal Composite rolls to its range. Diamantal is suitable for Supercalender and Soft Calender applications.
- Rubber & PU Rolls
Do RHL supply Rubber and PU rolls?
- Yes, as well as MaxExtractor™ and MaxResistor™ (RHL’s high performance textile squeezing rubber roll cover compounds), RHL offer a full range of standard rubber and PU roll coverings.
- Roberto™
How does Roberto achieve improved expression compared to rubber and PU?
- Roberto utilises both the liquid dam effect of compact rolls (eg Rubber and PU), however in addition its micro-porous structure absorbs liquid from the fabric enabling increased squeezing performance of 20-50% compared to rubber or PU.
- Nomex®
Is Nomex still available as a calender roll cover material?
- Yes, RHL are actively involved in the supply of Nomex rolls for specialist calendering applications.
- Bowls
What is a ‘bowl’?
- ‘Bowl’ or ‘calender bowl’ is a widely used term for a pressed fibre covered calender roll. The word bowl derives from the word ‘bole’ meaning trunk of a tree. Historically bowls were made using wooden tree trunks and the terminology has continued into modern use.
- Woollen Paper
What is the difference between Woollen Paper and Blue Denim Paper?
- Woollen Paper is a variation of Blue Denim Paper with a proportion of wool fibres added to the Blue Denim cotton fibres. The Wool fibres give the rolls extra resilience and slightly different performance properties compared to Blue Denim Paper.
- Blue Denim Paper
Why is there a cover material known as Blue Denim Paper?
- Blue Denim Paper is a paper based cover material produced from 100% cotton. The cotton fibres used are derived from off-cuts of Blue Denim fabric or from original blue denim threads. The blue dye in the Blue Denim gives the rolls their distinctive dark blue colour.