COMPOSITE TUBES AND METHOD OF MANUFACTURING SAME

• US 3,561,493 A
• Filed: 04/21/1965
• Issued: 02/09/1971
• Est. Priority Date: 04/21/1965
• Status: Expired due to Term

• Current Assignee: Paul Maillard, Rebeyrolle Michel
• Original Assignee: Paul Maillard, Rebeyrolle Michel
• Inventors: Maillard, Paul, REBEYROLLE MICHEL
• Application Number:
  US04/449,874
• Time in Patent Office: 2,120 Days
• US Class Current: 138/141
• CPC Class Codes: F16L 11/045 with four or more layers without reinforcement
• CPC Class Codes: F16L 59/14 Arrangements for the insulation of pipes or pipe systems F16L59/02 - F16L59/12 take precedence
• CPC Class Codes: F16L 9/121 with three layers
• CPC Class Codes: Y10T 428/1393 Multilayer [continuous layer]

Abstract

This invention is addressed to a tube formed of a plurality of interbonded layers of plastic material in which the plastic material in one layer differs from the plastic material in others with the adjacent layers of different plastic materials being interbonded with a layer formed of a precompounded mixture of the plastic materials making up the adjacent layers and extruded between said layers.

Claims

3. A plastic tube as claimed in claim 1 wherein said inner layer is polyundecanamide.

4. A plastic tube as claimed in claim 1 wherein said intermediate layer is a less than perfectly homogeneous mixture having the proportions by weight of between 50 and 70 per cent polyolefin and 50 and 30 per cent polyamide.

5. A plastic tub tube comprising an outer continuous tubular fused layer of a polyolefin, a continuous inner tubular fused layer of a polyamide, and an intermediate continuous fused layer of a plastic material composed of a mixture of the plastic materials making up the inner and outer layers in uniform distribution with the intermediate layer interbonding by fusion substantially throughout the interfaces with the outer continuous layer and inner continuous layer of different plastic materials.

6. A plastic tube as claimed in claim 5 in which the mixture of materials present in the intermediate and interbonding layer are present in the proportion of 5- 95 parts by weight of the plastic material in one layer and 95- 5 parts by weight of the plastic material in the other layer.