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EP0283207A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Injection moulding apparatus
Assignee: Cinpres Ltd
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Filing: 1988-03-10
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Granted: —
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Expires: 2008-03-10
Abstract
Abstract Apparatus for producing an injection moulding of plastics material comprises means (18) for introducing a supply of plastics material (19) through one or more openings (43) in a mould space (13), and means (26, 34) for introducing a pressurised gas through a separate opening (44) in the mould space into the plastics material filling the mould space whereby the gas creates a gas containing cavity (25) in the plastics material and for thereafter relieving the gas pressure within the gas containing cavity before the mould is opened. The gas supply/pressure relieving means comprise at said separate opening (44) a valve port (42) opening directly into the mould space, a valve member (26) for opening and closing the valve port, and means (34) to supply pressurised gas to the mould space. The gas supply means are arranged to supply gas through the valve member (26) whilst the valve member is in a valve port closed position to create the cavity and after a moulding operation has been finished, the supply of pressurised gas can be terminated and pressurised gas in the cavity in the moulding can be vented to the atmosphere due to movement of the valve member to a valve port open position.
Inventors
- 👤 Matthew Emmett Sayer
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 18:50
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/17; B29C45/1703; B29C45/1704; B29C45/1734; B29C45/20; B29C45/23; B29C45/46; B29C45/57; B29C2045/1729
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
207 words
Apparatus for producing an injection moulding of plastics material comprising means (18) for introducing a supply of plastics material (19) through one or more openings (43) in a mould space (13), and means (26, 34) for introducing a pressurised gas through a separate opening (44) in the mould space into the plastics material filling the mould space whereby the gas creates a gas containing cavity (25) in the plastics material and for thereafter relieving the gas pressure within the gas containing cavity before the mould is opened, said gas supply/pressure relieving means comprising at said separate opening (44) a valve port (42) opening directly into the mould space, a valve member (26) for opening and closing the valve port, and means (34) to supply pressurised gas to the mould space, characterised in that the gas supply means (34) is arranged to supply gas through the valve member (26) whilst the valve member is in a valve port closed position to create the cavity and after a moulding operation has been finished, the supply of pressurised gas can be terminated and pressurised gas in the cavity in the moulding can be vented to the atmosphere due to movement of the valve member to a valve port open position.
Claim 2
Dependent Claim
207 words
Apparatus for producing an injection moulding of plastics material comprising means (18) for introducing a supply of plastics material (19) through one or more openings (43) in a mould space (13), and means (26, 34) for introducing a pressurised gas through a separate opening (44) in the mould space into the plastics material filling the mould space whereby the gas creates a gas containing cavity (25) in the plastics material and for thereafter relieving the gas pressure within the gas containing cavity before the mould is opened, said gas supply/pressure relieving means comprising at said separate opening (44) a valve port (42) opening directly into the mould space, a valve member (26) for opening and closing the valve port, and means (34) to supply pressurised gas to the mould space, characterised in that the gas supply means (34) is arranged to supply gas through the valve member (26) whilst the valve member is in a valve port closed position to create the cavity and after a moulding operation has been finished, the supply of pressurised gas can be terminated and pressurised gas in the cavity in the moulding can be vented to the atmosphere due to movement of the valve member to a valve port open position.
Claim 3
Dependent Claim
100 words
Apparatus as claimed in Claim 1, characterised in that said gas supply/pressure relieving means comprise a first passageway (28) in said valve member (26) through which the pressurised gas enters the plastics material and after a moulding operation has been finished, the supply of pressurised gas can be terminated and pressurised gas in the cavity in the moulding can be vented through a second passageway (51) to the atmosphere due to movement of the valve member to a valve port open position, said first and second passageways converging at the opening (44) through which the gas enters the mould space.
Claim 4
Dependent Claim
39 words
Apparatus as claimed in Claim 2, characterised in that a non-return valve (30) is situated in an outlet end of the first passageway (28) such that neither plastics material nor pressurised gas can pass back through the first passageway.
Claim 5
Dependent Claim
29 words
Apparatus as claimed in Claim 3, characterised in that the outlet end of the valve member (26) is a separately constructed cap (32) which houses the non-return valve (30).
Claim 6
Dependent Claim
47 words
Apparatus as claimed in any one of Claims 2 to 4, characterised in that the second passageway (51) contains the valve member (26) whereby when the valve member is opened the pressurised gas passes around the valve member into the second passageway and thereby to the atmosphere.
Claim 7
Dependent Claim
44 words
Apparatus as claimed in any one of the preceding claims, characterised in that the valve member 26) is connected to the piston (29) of a piston and cylinder (27) for moving the valve member between its valve port closed and valve port open positions.
Claim 8
Dependent Claim
35 words
Apparatus as claimed in any one of the preceding claims, characterised in that said gas supply/pressure relieving means (26, 34) is provided at each of two or more openings (44) in the mould space (13).
Claim 9
Dependent Claim
49 words
Apparatus as claimed in any one of the preceding claims, characterised in that the means (18) for introducing a supply of plastics material (19) includes a hot runner system (17) leading to the or each opening (43) through which the plastics material is introduced into the mould space (13).
Claim 10
Dependent Claim
46 words
Apparatus as claimed in any one of the preceding claims, characterised in that the means (18) for introducing a supply of plastics material (19) is associated with valve means (21) for closing off the supply means when the required amount of plastics material has been supplied.
Claim 11
Dependent Claim
30 words
Apparatus as claimed in Claim 9, characterised in that the valve means associated with the means (18) for introducing a supply of plastics material (19) is a slide valve (21).
References Cited (Backward Citations)
No citation records indexed.
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