The Art of Owning & Operating Rubber Calenders

| CALENDERS |
and widths for use in tire building process.
In ground reality, the distance between the
creel room and your rubber calender
(varying between 20 – 60 feet depending on
your layout) is usually not environmentally
controlled and, hence the wire may be
exposed to moisture prior to its being
encapsulated in rubber.
This problem is worsened by slowdowns,
temporary shutdowns, humidity spikes and
failure to adequately control temperature
and humidity within the creel room. Once
the belt wire becomes contaminated with
moisture, it becomes more difficult to
obtain proper adhesion of the rubber to the
brass-coated wire.
The strongest possible bond between the
rubber and the belt wire is critical in the
construction of your steel belted radial
tyres.
Judging Quality
So, how do you judge the quality of a
calendered sheet?
Well, you could quantify the quality of your
fabric calendered sheet in terms of your
pre-desired
- Thickness of the sheet
- Spacing between cords
- Number of cords and
- Penetration of rubber into the space in
between cords.
Recently, an industry friend confided that
many rubber good manufacturers look at a
Rubber Calender as a 'mysterious rubber
machinery'. Is it because of all this nuances,
I wonder?
Image: Cross-section of Radial Tyre
13
Rubber & Tyre Machinery World | JUL 2016