synthetic cork

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This new type of closure became popular from the beginning of the 1990s as an alternative to the natural c ork because of the increased cork taint there. The stoppers are usually made of a rubber or Teflon mixture. Currently, three processes are used. In the injection moulding process, the stoppers are moulded individually; they are usually hard and very smooth and not particularly flexible. In the extrusion process (extrudere = to push out, to drive), a viscous, foamed plastic mass is pressed through a nozzle in a continuous process. The stoppers are then cut from this resulting strand. In coextrusion (merging of materials), a core of homogeneous, foamed plastic mass is inserted into a tube of plastic that provides radial elasticity. This type is considered the most suitable in terms of flexibility, tightness and uniformity.

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synthetic cork

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