# US 5,700,500 A · Two-stage injection-molding machine

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- Number: US 5,700,500 A
- Document ID: US5700500A
- Status: Granted
- Kind: A
- Application number: 08/656,744
- Filed: 1996-06-03
- Granted: 1997-12-23
- Earliest claimed: 1995-06-08
- Assignees: Polygram International Holding B.V.
- Inventors: Henning Wilhelm
- Web page: https://patentgrep.com/patent/US5700500A

## CPC

- B29C 45/16: Making multilayered or multicoloured articles {(B29C45/0062 takes precedence; feeding colouring materials into the injection unit B29C45/1816)}
- B29C 45/322: {Runner systems for distributing the moulding material to the stacked mould cavities}
- Y10S 425/81: Sound record
- 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)
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

## Abstract

The invention relates to a two-stage injection-molding machine with a fixed mold plate, a movable mold plate and a two-part intermediate assembly, arranged to be movable between said plates, and with a supply of injection-molding material for the intermediate assembly to supply the stages formed between the intermediate assembly and the mold plates with injection-molding material. In order to simplify the production of injection-molded parts of different colors in one and the same injection-molding process it is proposed, in accordance with the invention, that for each stage there has been provided a separate supply of injection-molding material via a separate main channel. In addition to the free choice of the color for each stage, it is possible to use various types of plastic per stage in one and the same injection-molding process.

## Claims

### Claim 1

A two-stage injection molding machine comprising:
a fixed mold plate;
a movable mold plate; and
an intermediate assembly arranged to be movable between said mold plates and which comprises a first distributor plate adjoining the fixed mold plate and a second distributor plate adjoining the movable mold plate;
the first and second distributor plates being respectively connected to first and second supply channels which supply injection-molding material thereto for distribution from the first supply channel to the fixed mold plate and from the second supply channel to the movable mold plate.

### Claim 2 (depends on 1)

An injection molding machine as claimed in claim 1, wherein the first supply channel is centrally positioned in relation to the fixed mold plate and the second supply channel is eccentrically positioned in relation to the movable mold plate.

### Claim 3

An injection molding machine comprising: first and second molding stages; an intermediate assembly between said molding stages and having a first and a second distributor plate; a main supply channel connected to the first distributor plate for supplying a first injection-molding material thereto for distribution to the first molding stage; a fixed mold plate adjoining the first molding stage; and a nozzle plate preceding the fixed mold plate, the main supply channel being centrally positioned in said nozzle plate; and wherein the nozzle plate is radially extended to eccentrically accommodate an auxiliary supply channel which is connected to the second distributor plate for supplying a second injection-molding material thereto for distribution to the second molding stage, the auxiliary supply channel having a change in direction thereof at the location of the first molding stage.

### Claim 4 (depends on 3)

An injection molding machine as claimed in claim 3, wherein parts of the auxiliary supply channel which are associated with said change in direction thereof are respectively detachably connected to the exterior of the fixed mold plate and to the exterior of the intermediate assembly.