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US 6,279,614 B1Granted
Multi-layer plastic tube
AssigneeHewing GmbH
InventorsFranz-Josef Riesselmann, Harald Eichner, Josef Bruenen, Paul Wolters, Nils Wehmeier
Life of this patent
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Abstract
A multi-layer plastic tube comprises a base tube and a barrier layer surrounding the base tube, the barrier layer being impermeable to oxygen, and a protective layer applied on the barrier layer for protecting the barrier layer from damage, wherein the material of the barrier layer and protective layers may include a lubricant.
Claims13
A multi-layer plastic tube comprising:
- a base tube,
- a barrier layer surrounding the base tube, said barrier layer being impermeable to oxygen, and including a lubricant, and
- a protective layer applied on the barrier layer for protecting the barrier layer from damage, the material of the protective layer being an adhesive having a lubricant added thereto.
A multi-layer plastic tube including,
- a base tube of cross-linked PE,
- an adhesive layer surrounding the base tube,
- a barrier layer surrounding the adhesive layer, said barrier layer being impermeable to oxygen, and
- a protective layer applied on the barrier layer for protecting the barrier layer from damage, the improvement comprising:
- the protective layer including a modified linear LDPE material of a density below 926 kg/m3, and
- the protective layer including a modified linear LDPE material of a density larger than 928 kg/m3,
- the modifications of the two linear LDPE materials being selected such that the adhesion of the protective layer to the EVOH barrier layer is larger than the adhesion of the EVOH barrier layer to the adhesive layer.
4 more elements
Dependencies are inferred from the claim text.