Ejector capable of being preheated, injection mold having the ejector, and method of manufacturing molded part using the injection mold

Patent metadata

Field	Value
Publication number	US-10464233-B2
Application number	US-201615165722-A
Country	US
Kind code	B2
Filing date	May 26, 2016
Priority date	May 29, 2015
Publication date	Nov 5, 2019
Grant date	Nov 5, 2019

Abstract

Disclosed is an injection mold. The injection mold includes a mold set having n molds (n is a natural number of ≥2) defining a cavity for injection molding a green body, and at least one ejector provided on at least one of the n molds to separate an injection-molded part from the mold set. The ejector is provided with a first heater capable of heating the mold set to a first temperature.

First claim

What is claimed is:

1. An injection mold comprising:
a mold set having n molds (n is a natural number of ≥2) defining a cavity for injection molding a green body; and
at least one ejector provided on at least one of the n molds to separate an injection-molded part from the mold set,
wherein the ejector is provided with a first heater capable of heating up the mold set to a first temperature,
wherein the injection mold further comprises a hollow sleeve tube surrounding the ejector, and
wherein the hollow sleeve tube contains a heat transfer fluid medium to transfer heat generated from the first heater of the ejector to the molds to heat the molds.

2. The injection mold according to claim 1 , wherein at least one of the n molds is provided with a second heater capable of heating up the mold set to a second temperature.

3. The injection mold according to claim 2 , wherein at least one of the n molds is provided with a second temperature sensor to measure a temperature of a contact surface of the mold and the cavity.

4. The injection mold according to claim 1 , wherein the ejector is provided with a first temperature sensor to measure a temperature of a contact surface of the ejector and the cavity.

5. The injection mold according to claim 1 , wherein the ejector is configured as the first heater itself.

6. The injection mold according to claim 1 , wherein the first heater is formed from a resistive heating body including a metallic heating body or a non-metallic heating body.

7. The injection mold according to claim 6 , wherein the first heater is formed from the metallic heating body composed of nichrome.

8. A method of manufacturing an injection-molded part using the injection mold according to claim 1 , the method comprising:
(a) heating up the mold set to a second temperature;
(b) heating up the mold set to the first temperature;
(c) injecting a feedstock into the cavity; and
(d) removing the injection-molded part from the injection mold.

9. The method according to claim 8 , wherein the step (a) is carried out by a second heater provided in at least one of the n molds.

Assignees

• Korea Inst Energy Res

Inventors

• Yeo Jeong-Gu
• Kim Young-Hwan
• Lee Jin-Seok
• Yang Seungcheol

Classifications

• B29C2045/7393

  alternately heating and cooling · CPC title

• B28B7/10 Primary

  Moulds with means incorporated therein, or carried thereby, for ejecting {or detaching} the moulded article ({flexible moulds bent open for ejecting B28B7/06; ejecting by tilting or inverting the mould B28B7/08; } devices, not forming part of the mould, for ejecting the moulded article B28B13/06) · CPC title

• B28B1/24

  by injection moulding {(injection moulding of ceramic slips B28B1/265; of tubular articles B28B21/38)} · CPC title

• B29C45/7337

  using gas or steam (B29C45/7331 takes precedence) · CPC title

• B29C2045/2741

  Plurality of independent thermocouples or heat sensors · CPC title