FR2236643A1 - Non-return valve for injection moulding screw tip - providing a positive seal against reverse flow past the screw - Google Patents
Non-return valve for injection moulding screw tip - providing a positive seal against reverse flow past the screwInfo
- Publication number
- FR2236643A1 FR2236643A1 FR7326059A FR7326059A FR2236643A1 FR 2236643 A1 FR2236643 A1 FR 2236643A1 FR 7326059 A FR7326059 A FR 7326059A FR 7326059 A FR7326059 A FR 7326059A FR 2236643 A1 FR2236643 A1 FR 2236643A1
- Authority
- FR
- France
- Prior art keywords
- screw
- reverse flow
- injection moulding
- providing
- return valve
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
- B29C45/47—Means for plasticising or homogenising the moulding material or forcing it into the mould using screws
- B29C45/50—Axially movable screw
- B29C45/52—Non-return devices
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
Injection moulding machines incorporating an Archimedean screws as a melt transfer/injection component where the screw end is fitted with an assembly which forms an annular rotary seal at the downstream end of the screw and directs the flow on through a coaxial passage incorporating a captive non-return ball valve. Positively prevents reverse flow of material past the screw tip as the screw is advanced to generate injection or consolidation pressures. Design can process different materials or grades, including PVC, without having to change the screw tip/barrel clearance to develop the required back pressure.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7326059A FR2236643A1 (en) | 1973-07-09 | 1973-07-09 | Non-return valve for injection moulding screw tip - providing a positive seal against reverse flow past the screw |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7326059A FR2236643A1 (en) | 1973-07-09 | 1973-07-09 | Non-return valve for injection moulding screw tip - providing a positive seal against reverse flow past the screw |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2236643A1 true FR2236643A1 (en) | 1975-02-07 |
FR2236643B1 FR2236643B1 (en) | 1976-06-18 |
Family
ID=9122666
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR7326059A Granted FR2236643A1 (en) | 1973-07-09 | 1973-07-09 | Non-return valve for injection moulding screw tip - providing a positive seal against reverse flow past the screw |
Country Status (1)
Country | Link |
---|---|
FR (1) | FR2236643A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2510472A1 (en) * | 1981-07-28 | 1983-02-04 | Ouest Cie | Screw tip valve for injection moulding fibre filled materials - esp. for materials contg. fibres up to 50mm long |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB931902A (en) * | 1961-02-22 | 1963-07-24 | Bone Brothers Ltd | Improvements in or relating to injection moulding machines |
-
1973
- 1973-07-09 FR FR7326059A patent/FR2236643A1/en active Granted
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB931902A (en) * | 1961-02-22 | 1963-07-24 | Bone Brothers Ltd | Improvements in or relating to injection moulding machines |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2510472A1 (en) * | 1981-07-28 | 1983-02-04 | Ouest Cie | Screw tip valve for injection moulding fibre filled materials - esp. for materials contg. fibres up to 50mm long |
Also Published As
Publication number | Publication date |
---|---|
FR2236643B1 (en) | 1976-06-18 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
ST | Notification of lapse |