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Conversion of rubber products, finishing

Conversion of rubber extrusions

Frames and rings, inflatable seals – After extrusion rubber profils can be converted into continuous rubber frames and rings, with vent holes or self adhesive backing.

Finishes – Special coatings can be applied to reduce friction, wear etc.

Incorporated connections – For inflatable seals a metal or rubber fitting or rubber tubing is added.

Bending of extruded profiles

Many rubber extrusions can be shaped to be bent in tighter radii than without this special treatment. Where non-shaped profiles would kink, these specials will follow radii tighter than 3 to 4 times their width.

This shaping of duroplasts is irreversible. The end result is a bent rubber profile – without splices – that will keep its shape.

Joining / Splicing

Cold vulcanisation – Cold vulcanisation is creating a seal by glueing of two or more rubber sections. Cyano-acrylate or rubbercement is used. This method is quick and cheap, joints however are not as good looking as spliced joints and may be brittle. The main disadvantage is the fact that because of different materials in sections and glued areas the joints respond differently to temperatue changes. This may cause premature failure in non-static applications.

Spliced joints – Splicing of extruded rubber sections show very nice results. The actual joining of the sections is made possible by a special rubber based substance during vulcanisation. This method allows for joints that share the properties of the extruded sections and that are barely visible. Special moulding tools are required.

Injection and compression molded joints – Injection en compression joints are made in moulds. Two sections of extruded profiles are stuck in a mould that is filled witha certain amount of elastomer by injection injected or by putting in the precisely measured amount of elastomer. During vulcanisation both ends of the sections are joint. This proces is used for the production of large series and result in very good looking joints. Special moulding tools are required.

Shapes

  • 90º angled frames
  • rounded corner frames
  • mitred corner frames
  • continuous loops
  • bespoke shape frames

Coating

Suppression of noise, wear and abrasion – Coating is especially advised for use in environments where moisture films build up, eg. when wet rubber starts to dry (non-stick). Another use of this finish is the elimination of squeaking noises due to rubbing of rubber against their counterparts (dry lubrication).

It’s used in marine for (sliding) doors and hatches, in automotive for car windows, weather stripping and sunroofs, in building and construction for home windows and various other rubber gaskets.

Available coating materials

PTFE coating – Offering a very low friction coëfficient (COF) so eliminating squeaks and adding ease of assembly, high chemical resistance, colors for decoration or identification and improved aging properties of rubber (resistance to solvents and UV rays). Teflon coatings allow elongation of up to 200%.

Flock coating – A velours-textured material that adds a nice appearance, color, insulating value, vibration dampening, friction reduction and moisture absorption to rubber products. This coating also eliminates squeaks and increases ease of assembly.

LIKON

Mail address

P.O. Box 23
Zeeland, 5410 AA
The Netherlands

Visiting address

Kerkstraat 101
Zeeland, 5411 CK
The Netherlands

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