# US 4,397,806 A · Method and apparatus for mold injection

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- Number: US 4,397,806 A
- Document ID: US4397806A
- Status: Granted
- Kind: A
- Application number: 06/315,351
- Filed: 1981-10-26
- Granted: 1983-08-09
- Earliest claimed: 1981-10-26
- Inventors: Siebolt Hettinga
- Web page: https://patentgrep.com/patent/US4397806A

## CPC

- B29C 45/07: using movable injection units
- B29C 45/54: and plasticising screw {(B29C45/532 takes precedence)}
- B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00)

## Abstract

The method and apparatus for the injection of an injection material into a mold includes an upright extruder mechanism having an upright feed screw driven from its lower end. Material introduced at the top of the extruder is fed by the screw outwardly of the extruder through an outlet projected laterally outwardly from the extruder at a position adjacent the lower end of the screw. The extruder outlet constitutes a piston receivable with a cylindrical material chamber of an injection nozzle unit. Material is fed in one direction in incremental amounts from the extruder and into the material chamber when the extruder is moved in one direction relative to the injection nozzle unit, and is then forced from the material chamber by the extruder outlet and into the nozzle unit for injection into a mold when the extruder is moved in an opposite direction relative to the nozzle unit.

## Claims

### Claim 1

The method of injecting an injection material into a mold comprising the steps of:
(a) introducing particulate injection material into one end of a confined path having an outlet projected laterally from the other end thereof,
(b) continuously advancing the material in said confined path toward and through said outlet for discharge into an injection nozzle unit,
(c) uniformly heating the material over the course of said path,
(d) moving the confined path in one direction relative to the injection nozzle unit to move the outlet into the nozzle unit for injecting material therefrom into a mold, and then
(e) moving the confined path a predetermined distance in an opposite direction relative to the injection nozzle unit by the discharge of the continuously advancing material from said outlet into the injection nozzle unit.

### Claim 2 (depends on 1)

The method of claim 1, including:
(a) blocking the material in said path against movement toward the one end thereof during the injection of the material into a mold.

### Claim 3 (depends on 1)

The method of claim 1, including:
(a) varying the movement of the confined path in said opposite direction, relative to the injection nozzle unit, to vary the amount of injection material being discharge into said injection nozzle unit for injection into a mold.