# US 2014/0197572 A1 · Method for producing a tubular hollow body, and tubular hollow body

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- Number: US 2014/0197572 A1
- Document ID: US20140197572A1
- Status: Published application
- Kind: A1
- Application number: 14/149,344
- Filed: 2014-01-07
- Published: 2014-07-17
- Earliest claimed: 2009-03-09
- Assignees: Georg Fischer JRG AG
- Applicants: Georg Fischer JRG AG
- Inventors: Erasmo Porfido; Peter Heer; Markus Breyer
- Web page: https://patentgrep.com/patent/US20140197572A1

## CPC

- B29D 23/003: {Pipe joints, e.g. straight joints}
- B29C 33/0016: {Lost moulds, e.g. staying on the moulded object (flexible bags without particular shape filled with expandable material B29C44/182; single use mandrels for winding and forming B29C53/822)}
- B29C 45/2614: {for manufacturing bent tubular articles using an undercut forming mould core}
- B29C 70/70: Completely encapsulating inserts {(B29C70/86 takes precedence)}
- B29D 23/001: {Pipes; Pipe joints (pleated hoses B29D23/18)}
- B29C 45/14598: {Coating tubular articles}
- B29L 2023/004: {Bent tubes (for use as pipe couplings B29L2031/24)}
- Y10T 428/139: Open-ended, self-supporting conduit, cylinder, or tube-type article
- B29D: PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE (making granules B29B9/00; making preforms B29B11/00)
- 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)
- B29L: INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

The invention relates to a method for producing a tubular hollow body (1) with at least three pipe openings, partly or completely consisting of plastics material. It is provided that a lost core pipe (9), which has a connection opening (13, 14) on each of its ends and has at least one docking opening (11) along its length, is produced, that the core pipe (9) is introduced into a cavity of a mould, with two non-lost core pieces (17, 18) being arranged with one of their ends (3, 4) respectively against the connection openings (13, 14) in a sealing manner and a non-lost core part (19) being arranged with one end against the docking opening (11) in a sealing manner, in that plastics material (25) is then introduced into the mould cavity to encapsulate the core pipe (9), the core pieces (17, 18) and the core part (19) and that, once the plastics material (25) has cured, the core pieces (17, 18) and the core part (19) are withdrawn from the hollow body (1) created. The invention also relates to a corresponding hollow body (1).

## Claims

### Claim 1

Method for producing a tubular hollow body (1) with at least three pipe openings, partly or completely consisting of plastics material, comprising the steps of producing a lost core pipe (9), which has a connection opening (13, 14) at each of its ends and has at least one docking opening (11) along its length, wherein the core pipe (9) is introduced into a cavity of a mould, with two non-lost core pieces (17, 18) being arranged with one of their ends (3, 4) respectively against the connection openings (13, 14) in a sealing manner and a non-lost core part (19) being arranged with one end against the docking opening (11) in a sealing manner, in that plastics material (25) is then introduced into the mould cavity to encapsulate the core pipe (9), the core pieces (17, 18) and the core part (19) and in that, once the plastics material (25) has cured, the core pieces (17, 18) and the core part (19) are withdrawn from the hollow body (1) created.

### Claim 2 (depends on 1)

Method according to claim 1, including, after introduction of the core pipe (9), the core pieces (17, 18) and the core part (19), closing the mould.

### Claim 3 (depends on 2)

Method according to claim 2, including, after the core pieces (17, 18) and the core part (19) have been withdrawn, opening the mould.

### Claim 4 (depends on 1)

Method according to claim 1, providing a mould which has the core pieces (17, 18) and the core part (19) as displaceable elements.

### Claim at position 5

5-8. (canceled)