GB866929A - Improvements in or relating to injection moulding machines - Google Patents
Improvements in or relating to injection moulding machinesInfo
- Publication number
- GB866929A GB866929A GB36347/57A GB3634757A GB866929A GB 866929 A GB866929 A GB 866929A GB 36347/57 A GB36347/57 A GB 36347/57A GB 3634757 A GB3634757 A GB 3634757A GB 866929 A GB866929 A GB 866929A
- Authority
- GB
- United Kingdom
- Prior art keywords
- screw
- valve
- piston
- injection
- bores
- 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.)
- Expired
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
866,929. Injection moulding. NOTHELFER, W. Nov. 21, 1957 [Nov. 21, 1956], No. 36347/57. Class 87(2). Pressure is maintained in an injection cylinder 2 by an annular non-return valve 12 disposed at the forward end of an injection screw 6. The screw 6 is rotatable and axially reciprocable, and the valve 12 is slidable on an extension 10 of the screw. Rotation of the screw causes the injection material to move the valve 12 forwardly to allow passage of this material through bores 13 in the valve 12, Fig. 1, and an annular groove 17 and bores 9 in an injection piston 8. Forward axial movement of the screw 6 and piston 8 forces the valve 12 into contact with a conical surface 14 on the screw to prevent reverse flow of the material. In a modification, Fig. 3, (not shown), the bores 9 in the piston 8 are replaced by an open annular space surrounding the piston which is thus of smaller diameter. In Fig. 4 a short annular valve 12 having bores 13<SP>11</SP> is slidable between a surface 14 of the screw 6 and a ring 18, the piston 8 being dispensed with. In Fig. 5 the non-return valve comprises a ring 12 providing an annular clearance 25, and the movement of the ring 12 is limited by projections 22 on a member 21.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR866929X | 1956-11-21 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB866929A true GB866929A (en) | 1961-05-03 |
Family
ID=9345282
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB36347/57A Expired GB866929A (en) | 1956-11-21 | 1957-11-21 | Improvements in or relating to injection moulding machines |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB866929A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0264558A2 (en) * | 1986-08-20 | 1988-04-27 | Marzio Cappelletti | Non-return valve for screw injection units for thermoplastics |
| WO1992020508A1 (en) * | 1991-05-13 | 1992-11-26 | Dray Robert F | Positive-type non-return valve |
| US5401161A (en) * | 1991-06-14 | 1995-03-28 | Long; Michael C. | Injection molding valve |
| US5470514A (en) * | 1991-05-13 | 1995-11-28 | Dray; Robert F. | Injection molding method for a shot of determined mass |
-
1957
- 1957-11-21 GB GB36347/57A patent/GB866929A/en not_active Expired
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0264558A2 (en) * | 1986-08-20 | 1988-04-27 | Marzio Cappelletti | Non-return valve for screw injection units for thermoplastics |
| EP0264558A3 (en) * | 1986-08-20 | 1989-05-24 | Marzio Cappelletti | Non-return valve for screw injection units for thermoplastics |
| WO1992020508A1 (en) * | 1991-05-13 | 1992-11-26 | Dray Robert F | Positive-type non-return valve |
| US5258158A (en) * | 1991-05-13 | 1993-11-02 | Dray Robert F | Positive-type non-return valve and method of using valve |
| AU652275B2 (en) * | 1991-05-13 | 1994-08-18 | Robert F. Dray | Positive-type non-return valve |
| US5470514A (en) * | 1991-05-13 | 1995-11-28 | Dray; Robert F. | Injection molding method for a shot of determined mass |
| US5401161A (en) * | 1991-06-14 | 1995-03-28 | Long; Michael C. | Injection molding valve |
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