Rubber and Plastic Industry

Download Rubber and Plastic Products Brochure

Berndorf Band is one of the world’s leading manufacturers of high quality process belts made of stainless steel. Continuous development, innovative production methods and new materials enable us to design the belt features to meet our customers’ needs exactly.

Spirally welded belts are particularly suited for use in the continuous production of flat rubber and plastic products. Due to the unique patented spiral design there is, especially for wide belts no need for a longitudinal and a cross welding seam. Hence there is also no joining point of welding seams, which in turn has a major positive influence to tolerances and lifetime of steel belts.

Berndorf Band belts excel themselves in their superior surface quality, which results in high quality final products. A worldwide service net guarantees quick availability of highly qualified service specialists.

The principle of a rotating vulcanizing press

The product is introduced over the infeed drum to the heating drum, and after a 3/4 rotation it
is passed over to another deflection pulley.

The vulcanization process is carried out by compressing the product between the tensioned back heated steel belt and the heating drum.

  Spirally welded steel belts

Spirally welded steel belts were developed by Berndorf Band specially for wide rotocure presses.

There are no joining points from seams along lengths and widths, so local variances in thickness are eliminated.

Thanks to its construction the spirally welded belt has a longer lifetime than conventionally manufactured belts with welded seams along lengths and widths.

Due to the positioning of the welded seam in a helical line along the whole bandwidth there is no deterioration in physical characteristics of the steel belt, as the welding factor has a minimal influence on the tensile strength, therefore the full resistance to extension of the material is available.

  NICRO 52.6 and NICRO 62.5

Berndorf Band has been using both of these martensitic materials successfully since 1983 for
example in continuous double belt and rotocure presses.

Following models are available:

• Mill finished belt: *
• Products: Standard flat rubber and plastic products, for example transport belts
• Advantages: Belt width up to 1,600 mm possible
* Heat treatment of materials can lead to optically different colors of mill finished surfaces. This is however removed by cleaning brushes during normal operation and does not impair the steel belt quality or the production.


• Belt ground on one side:
• Products: High quality rubber transport belts, printing backcloths, re-enforced rubber products and products for inflatives
• Advantage: Very good thickness uniformity
  
• Belt ground on both sides:
• Products: Coating for containers, pipes and reactors in the chemical industry
• Advantage: Best possible thickness uniformity

Technical Data
Physical and mechanical properties. Typical values.

Belt flatness

* measured with a 75 mm precision ruler at a belt tension of 50 N/mm2
** measured with a 200 mm precision ruler at a belt tension of 50 N/mm2
Cross welding seam angles: 45°, 60°, 80°, spirally welded