FR2342149A1 - Tip and sleeve valve for screw of injection moulding machine - with an eccentric head to let the sleeve be removed over the tip - Google Patents
Tip and sleeve valve for screw of injection moulding machine - with an eccentric head to let the sleeve be removed over the tipInfo
- Publication number
- FR2342149A1 FR2342149A1 FR7605926A FR7605926A FR2342149A1 FR 2342149 A1 FR2342149 A1 FR 2342149A1 FR 7605926 A FR7605926 A FR 7605926A FR 7605926 A FR7605926 A FR 7605926A FR 2342149 A1 FR2342149 A1 FR 2342149A1
- Authority
- FR
- France
- Prior art keywords
- tip
- sleeve
- screw
- head
- neck
- 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
An extruder screw tip with an eccentric head and bevelled faces at each end of an integral neck for locating against a sleeve valve which is slightly shorter than the neck. Used esp. for injection moulding machines where reciprocation of the screw is used to fill the mould. The sleeve may be removed over the head of the tip by an axial shift when the screw is advanced sufficiently clear of the barrel, without needing to extract the screw completely and remove the sleeve over the screw root, yet the sleeve is captive when the head is in the barrel. Sleeves and/or heads can therefore be readily substd. to suit different melt characteristics or shot sizes. The melt has a clear peth past the shallow sides of the head, is less prone to blocking or delayed remelting than designs where the melt passes the head through drilled passages or surface channels. The tip is more robust than designs involving separate root, neck and head components coupled (screwed) together.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7605926A FR2342149A1 (en) | 1976-02-25 | 1976-02-25 | Tip and sleeve valve for screw of injection moulding machine - with an eccentric head to let the sleeve be removed over the tip |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7605926A FR2342149A1 (en) | 1976-02-25 | 1976-02-25 | Tip and sleeve valve for screw of injection moulding machine - with an eccentric head to let the sleeve be removed over the tip |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2342149A1 true FR2342149A1 (en) | 1977-09-23 |
FR2342149B1 FR2342149B1 (en) | 1979-09-21 |
Family
ID=9169855
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR7605926A Granted FR2342149A1 (en) | 1976-02-25 | 1976-02-25 | Tip and sleeve valve for screw of injection moulding machine - with an eccentric head to let the sleeve be removed over the tip |
Country Status (1)
Country | Link |
---|---|
FR (1) | FR2342149A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4530605A (en) * | 1982-12-21 | 1985-07-23 | Krauss-Maffei Aktiengesellschaft | Check valve arrangement for the discharge end of an extruder, plastifier or the like |
-
1976
- 1976-02-25 FR FR7605926A patent/FR2342149A1/en active Granted
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4530605A (en) * | 1982-12-21 | 1985-07-23 | Krauss-Maffei Aktiengesellschaft | Check valve arrangement for the discharge end of an extruder, plastifier or the like |
Also Published As
Publication number | Publication date |
---|---|
FR2342149B1 (en) | 1979-09-21 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
ST | Notification of lapse |