Co-extruded multilayer articles including continuous layer and discontinuous layer

Patent metadata

Field	Value
Publication number	US-11618237-B2
Application number	US-202016810137-A
Country	US
Kind code	B2
Filing date	Mar 5, 2020
Priority date	Mar 5, 2019
Publication date	Apr 4, 2023
Grant date	Apr 4, 2023

Abstract

This disclosure describes co-extruded multilayer articles including at least one continuous layer and one discontinuous layer, as well as systems and techniques for the manufacture of co-extruded multilayer articles. For example, a co-extruded multilayer article is described that includes a body having a plurality of layers, where a first layer of the plurality of layers is formed from a first material and is continuous along a longitudinal axis of the body, and a second layer of the plurality of layers is formed from a second material and is discontinuously co-extruded along the longitudinal axis.

First claim

What is claimed is:

1. A co-extruded multilayer article having a substantially tubular shape surrounding an interior region, comprising:
a first layer extending continuously along a longitudinal axis from a first terminal edge of the co-extruded multilayer article to a second terminal edge of the co-extruded multilayer article, wherein the first layer comprises a first material defining a first interior surface concentric to the longitudinal axis and exposed to the interior region; and
a second layer extending along a portion of the interior surface of the first layer from a first terminal edge to a second terminal edge, wherein the second layer comprises a second material defining a second interior surface concentric and continuous circumferentially to the longitudinal axis and exposed to the interior region.

2. The co-extruded multilayer article of claim 1 , wherein at least one of the first material and the second material comprises a generally uniaxially aligned polymer.

3. The co-extruded multilayer article of claim 1 , wherein the body is substantially free of at least one of subtractive manufacturing tool marks, parting lines, and gate marks.

4. The co-extruded multilayer article of claim 1 , wherein the co-extruded multilayer article comprises a plurality of bodies, wherein the second layer is periodically discontinuous.

5. The co-extruded multilayer article of claim 1 , wherein the first material comprises an electrically insulative polymeric material and wherein the second material comprises an electrically conductive polymeric material.

6. The co-extruded multilayer article of claim 1 , wherein the co-extruded multilayer tube comprises a cable accessory, and wherein the second layer comprises an electrode centrally disposed in the cable accessory.

7. The co-extruded multilayer article of claim 6 , wherein the cable accessory comprises a power cable splice device.

8. The co-extruded multilayer article of claim 1 , wherein the second interior surface and the first interior surface have substantially the same inner diameter.

9. The co-extruded multilayer article of claim 1 , wherein the second layer is partially embedded in a portion of the first layer.

10. The co-extruded multilayer article of claim 1 , wherein the first and second terminal edges of the second layer are adjacent to the first inner surface of the first layer.

11. The co-extruded multilayer article of claim 1 , wherein the second layer comprises a single second layer disposed between the first and second terminal edges of the co-extruded multilayer article.

Assignees

• 3M Innovative Properties Company

Inventors

• Biegler Robert M
• Hoisington Mark A
• Hoff Craig R
• Jachim Anton F
• Maki Jeffrey M
• Patzman Derek W
• Blong Thomas J
• Jennen Jay M
• Aho Erik A
• Mahoney David V

Classifications

• B32B27/06

  as the main or only constituent of a layer, {which is} next to another layer of {the same or of} a {different material (next to a layer of a particular substance B32B9/045; next to a bituminous or tarry layer B32B11/046; next to a water setting substance layer B32B13/12; next to a metal layer B32B15/08; next to a glass layer B32B17/10; next to a layer formed of natural mineral fibres or particles B32B19/045; next to a wood layer B32B21/08; next to a cellulosic plastic layer B32B23/08; next to a natural or synthetic rubber layer B32B25/08)} · CPC title

• B29C48/10

  flexible, e.g. blown foils · CPC title

• B29C48/301

  having reciprocating, oscillating or rotating parts · CPC title

• B32B2307/202

  Conductive · CPC title

• B29C48/2556

  provided in or in the proximity of dies (B29C48/302, B29C48/31, B29C48/325 take precedence) · CPC title