# US 7,607,633 B2 · Cooled mold system for making a preform

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- Number: US 7,607,633 B2
- Document ID: US7607633B2
- Status: Granted
- Kind: B2
- Application number: 11/432,759
- Filed: 2006-05-11
- Published: 2006-11-23
- Granted: 2009-10-27
- Earliest claimed: 2005-05-20
- Assignees: GWK Gesellschaft Warme Kaltetechnik mbH
- Inventors: Reinhard Zeppenfeld
- Web page: https://patentgrep.com/patent/US7607633B2

## CPC

- B29C 45/7312: {Construction of heating or cooling fluid flow channels}
- B29C 2033/042: {Meander or zig-zag shaped cooling channels, i.e. continuous cooling channels whereby a plurality of cooling channel sections are oriented in a substantial parallel direction}
- B29K 2105/253: {Preform}
- 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)
- B29K: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR {MOULDS, } REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS

## Abstract

A mold system has a hollow outer mold part extending along a mold axis, a hollow inner mold part inside the outer mold part and forming therewith an elongated cup-shaped cavity adapted to hold a plastic mass for the production of a preform, and a cooling tube extending coaxially inside the hollow inner part and forming a passage having an inner portion inside the tube and an annular-section outer portion outside the tube and between an outer surface of the tube and an inner surface of the inner mold part. A cooler circulates a coolant fluid through the passage. A plurality of angularly spaced and generally axially extending support ribs extend radially from one of the surfaces toward the other surface in the outer passage portion.

## Claims

### Claim 1

A mold system comprising:
a hollow outer mold part extending along a mold axis;
a hollow and thin-walled inner mold part inside the outer mold part, substantially less rigid than the outer mold part, and forming therewith an elongated cup-shaped cavity adapted to hold a plastic mass for the production of a preform;
a cooling tube extending coaxially inside the hollow inner part and forming a passage having an inner portion inside the tube and an annular-section outer portion outside the tube and between an outer surface of the tube and an inner surface of the inner mold part;
means for circulating a coolant fluid through the passage;
four angularly substantially equispaced and generally axially extending support ribs extending radially from one of the surfaces and bearing radially on the other surface in the outer passage portion; and
a plurality of generally axially extending cooling ribs projecting inward from the inner-part inner surface, between each of the support ribs and an adjacent one of the support ribs, and each having an inner edge spaced from the tube outer surface.

### Claim 2 (depends on 1)

The mold system defined in claim 1 wherein both of the mold parts have a closed end and an open end, the cooling tube having an inner end spaced from the closed inner-part end.

### Claim 3 (depends on 1)

The mold system defined in claim 1 wherein the support ribs bear radially on the other of the surfaces, whereby the support ribs brace the inner part relative to the tube.

### Claim 4 (depends on 1)

The mold system defined in claim 1 wherein the inner mold part has a wall thickness of about 1.5 mm.

### Claim 5 (depends on 1)

The mold system defined in claim 1 wherein the inner mold part is thermally highly conductive and the tube is thermally insulating.

### Claim 6 (depends on 1)

The mold system defined in claim 1 wherein the support ribs bear radially on the other of the surfaces, whereby the support ribs brace the inner part relative to the tube.

### Claim 7 (depends on 6)

The mold system defined in claim 6 wherein the ribs all extend generally parallel to the axis.

### Claim 8 (depends on 6)

The mold system defined in claim 6 wherein the ribs extend generally helically.

### Claim 9 (depends on 8)

The mold system defined in claim 8 wherein the ribs each extend angularly only through about 360° between inner and outer ends.