Method for manufacturing pressure-sensitive sensor, pressure-sensitive sensor manufacturing equipment, and pressure-sensitive sensor

Patent metadata

Field	Value
Publication number	US-11555754-B2
Application number	US-202017093830-A
Country	US
Kind code	B2
Filing date	Nov 10, 2020
Priority date	Dec 18, 2017
Publication date	Jan 17, 2023
Grant date	Jan 17, 2023

Abstract

A method for manufacturing a pressure-sensitive sensor includes providing an extruder that includes a cylindrical die, a mandrel arranged inside the die and having plural helical grooves on an outer circumferential surface, and an annular outlet sandwiched between the die and the mandrel, and by using the extruder, performing simultaneous extrusion-molding of an elastic insulating material and an elastic conductive material by supplying the elastic conductive material into not less than two of the grooves from the inside of the mandrel while extruding the elastic insulating material, so as to form a pressure-sensitive sensor. The sensor includes a tubular body including an elastic insulation and having a hollow portion along a longitudinal direction, and not less than two conductive ribs including an elastic conductor and helically provided along an inner circumferential surface of the hollow portion of the tubular body so as to protrude inward from the inner circumferential surface.

First claim

What is claimed is:

1. A pressure-sensitive sensor manufacturing equipment, comprising:
a cylindrical die;
a mandrel arranged inside the die; and
an annular outlet sandwiched between the die and the mandrel,
wherein the outlet is configured such that a tubular body comprising an elastic insulation and a hollow portion along a longitudinal direction thereof can be extrusion-molded by discharging an elastic insulating material through the outlet, and
wherein the mandrel comprises a plurality of helical grooves formed on an outer circumferential surface thereof and an elastic conductive material flow path for supplying an elastic conductive material into not less than two of the grooves from an inside of the mandrel,
wherein at least one of the plurality of grooves is not in communication with the elastic conductive material flow path,
wherein the die comprises a helical outer groove formed on an inner circumferential surface thereof.

Assignees

• Hitachi Metals Ltd

Inventors

• Sugita Keisuke
• Abe Masahiro

Classifications

• B29C48/156

  Coating two or more articles simultaneously · CPC title

• B29C48/30

  Extrusion nozzles or dies (extrusion characterised by the shape or cross-section of the extruded article B29C48/03) · CPC title

• B29C48/34

  Cross-head annular extrusion nozzles, i.e. for simultaneously receiving moulding material and the preform to be coated · CPC title

• B29C48/022

  characterised by the choice of material · CPC title

• B29C48/09 Primary

  Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels · CPC title