JPS6463121A - Device for preventing backflow in injection molder - Google Patents
Device for preventing backflow in injection molderInfo
- Publication number
- JPS6463121A JPS6463121A JP22107387A JP22107387A JPS6463121A JP S6463121 A JPS6463121 A JP S6463121A JP 22107387 A JP22107387 A JP 22107387A JP 22107387 A JP22107387 A JP 22107387A JP S6463121 A JPS6463121 A JP S6463121A
- Authority
- JP
- Japan
- Prior art keywords
- screw
- resin
- screw head
- resin flow
- shaft
- 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
- 238000002347 injection Methods 0.000 title abstract 3
- 239000007924 injection Substances 0.000 title abstract 3
- 230000003405 preventing effect Effects 0.000 title abstract 2
- 239000011347 resin Substances 0.000 abstract 8
- 229920005989 resin Polymers 0.000 abstract 8
- 238000000034 method Methods 0.000 abstract 1
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
PURPOSE:To correctly, surely and instantaneously perform a backflow preventing action by a method wherein a shaft anchored to a screw head for opening and closing a resin flow path, which is made between the screw head and the end of a screw, is fittingly inserted in the screw in order to open and close said resin flow path by forcibly moving said shaft back and forth. CONSTITUTION:By rotating a screw 1, resin is passed through a gap E, which is made between screw head 8 and the front end C of the screw, and resin flow ports 12 so as to start to be stored in a chamber on the side of a nozzle hole 7 ahead the screw head 8. As a result, the screw 1 is moved rightward and back by means of the pressure of the resin so as to retreat a connecting plate 4 at the back part of the screw 1 and at the same time to move the piston rods 17 of injection cylinders 9 rightward and back. When rods 16 are moved rightward just before injection, the screw head 8 is moved rightward and back through a connecting member 14 and a shaft 13 so as to be abutted against the surface at the front end C of the screw in order to close the resin flow ports 12 of the screw head, resulting in confining the resins in flow paths (b). Accordingly, the backflowing of the resin can be completely prevented from occurring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22107387A JPH0771813B2 (en) | 1987-09-03 | 1987-09-03 | Backflow prevention device for injection molding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22107387A JPH0771813B2 (en) | 1987-09-03 | 1987-09-03 | Backflow prevention device for injection molding machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6463121A true JPS6463121A (en) | 1989-03-09 |
| JPH0771813B2 JPH0771813B2 (en) | 1995-08-02 |
Family
ID=16761062
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22107387A Expired - Fee Related JPH0771813B2 (en) | 1987-09-03 | 1987-09-03 | Backflow prevention device for injection molding machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0771813B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19928770C2 (en) * | 1999-02-19 | 2003-11-20 | Krauss Maffei Kunststofftech | injection molding machine |
-
1987
- 1987-09-03 JP JP22107387A patent/JPH0771813B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19928770C2 (en) * | 1999-02-19 | 2003-11-20 | Krauss Maffei Kunststofftech | injection molding machine |
| DE19928770B8 (en) * | 1999-02-19 | 2006-08-03 | Krauss-Maffei Kunststofftechnik Gmbh | injection molding machine |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0771813B2 (en) | 1995-08-02 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |