Plastics pipe
OwnerJeremy Bowmaninventor
Life of this patent
Estimating the term…
Abstract
A plastics pipe which comprises an inner core and an outer removable skin layer bonded thereto, the outer removable skin layer comprising at least two layers of compatible polymeric materials, a first outer protective layer chosen for its physical and mechanical properties, and a second inner bonding layer which adheres to the inner core, the adhesion of the bonding layer to the inner core being sufficient to prevent substantial undesired relative movement between the skin layer and the core during installation, but insufficient to prevent the outer skin layer from being cleanly removed by peeling, at least at the ends of the pipe, and insufficient to cause a substantial reduction in the impact strength of the inner core.
Claims20
A plastics pipe which comprises an inner core and an outer removable skin layer bonded thereto,
- The outer removable skin layer comprising at least two layers of compatible polymeric materials, a first outer protective layer chosen for its physical and mechanical properties, and a second inner bonding layer which adheres to the inner core, the adhesion of the bonding layer to the inner core being sufficient to prevent substantial undesired relative movement between the skin layer and the core during installation, but insufficient to prevent the outer skin layer from being cleanly removed by peeling, at least at the ends of the pipe, and insufficient to cause a substantial reduction in the impact strength of the inner core.
(canceled)
A method for the production of a plastics pipe comprising an inner core and an outer removable skin layer bonded thereto, the outer removable skin layer comprising at least two layers of compatible polymeric materials, a first outer protective layer chosen for its physical and mechanical properties, and a second inner bonding layer which adheres to the inner core, which method comprises co-extruding molten polymeric materials forming the inner core and the outer removable skin layer from one or more extruder dies, bringing the molten polymeric materials together and allowing them to cool, such that, on cooling, the adhesion of the bonding layer to the inner core is sufficient to prevent substantial undesired relative movement between the skin layer and the core during installation of the pipe, but insufficient to prevent the outer skin layer from being cleanly removed by peeling, at least at the ends of the pipe, and insufficient to cause a substantial reduction in the impact strength of the inner core.
(canceled)
Dependencies are inferred from the claim text.