WO1984002106A1 - Insulated sprue bushing in plastic molding apparatus - Google Patents
Insulated sprue bushing in plastic molding apparatus Download PDFInfo
- Publication number
- WO1984002106A1 WO1984002106A1 PCT/US1983/000672 US8300672W WO8402106A1 WO 1984002106 A1 WO1984002106 A1 WO 1984002106A1 US 8300672 W US8300672 W US 8300672W WO 8402106 A1 WO8402106 A1 WO 8402106A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- sprue bushing
- insulated
- bushing
- sprue
- die
- Prior art date
Links
- 238000010137 moulding (plastic) Methods 0.000 title claims description 8
- 238000009413 insulation Methods 0.000 claims abstract description 6
- 239000000463 material Substances 0.000 claims description 19
- 150000001875 compounds Chemical class 0.000 claims description 15
- 239000004033 plastic Substances 0.000 claims description 13
- 229920003023 plastic Polymers 0.000 claims description 13
- 238000001746 injection moulding Methods 0.000 claims description 10
- 229920001187 thermosetting polymer Polymers 0.000 claims description 6
- 150000002989 phenols Chemical class 0.000 claims description 5
- 238000010136 thermoset moulding Methods 0.000 abstract description 4
- 238000000465 moulding Methods 0.000 description 14
- 238000002347 injection Methods 0.000 description 7
- 239000007924 injection Substances 0.000 description 7
- 229920001169 thermoplastic Polymers 0.000 description 5
- 239000004416 thermosoftening plastic Substances 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 4
- 239000011810 insulating material Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 239000012212 insulator Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 241000192308 Agrostis hyemalis Species 0.000 description 1
- 229920000877 Melamine resin Polymers 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229920000180 alkyd Polymers 0.000 description 1
- 230000001413 cellular effect Effects 0.000 description 1
- 239000004088 foaming agent Substances 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N phenol group Chemical group C1(=CC=CC=C1)O ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 239000012260 resinous material Substances 0.000 description 1
- 238000009757 thermoplastic moulding Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 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
- B29C45/26—Moulds
- B29C45/27—Sprue channels ; Runner channels or runner nozzles
-
- 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
- B29C45/26—Moulds
- B29C45/27—Sprue channels ; Runner channels or runner nozzles
- B29C2045/2766—Heat insulation between nozzle and mould
Definitions
- Apparatus for molding of plastics comprises dies mounted on die blocks which blocks in turn are mounted on the platens of a press. Molten or plasticized material is forced by pressure out of a nozzle through a sprue bushing which sprue bushing serves to transmit or conduct the plasticized material from the nozzle to the runners which feed the plasticized material to the various cavities.
- thermoplastics as outlined above, in that due to the temperature difference between the nozzle and the sprue bushing, it is necessary to heat the material at the nozzle to an excessively high temperature in order to be sure the plasticized material or compound will feed into the die.
- the high temperature required as indicated above can cause break down of the plasticized material, while without adequate heating, cold spots develop on passage from the nozzle through the sprue bushing into the runners, then to the cavities.
- injection molding of thermoset compounds it is important that the sprue bushing be insulated from the heated die to prevent premature curing or "setting" of the plasticized material or compound prior to filling of the molding cavities.
- an insulated sprue bushing is useful in thermoplastic and thermoset molding.
- Patent 2,227,966 to E sley for "Injection Type Mold” which states: An object of the invention is to substantially retard cooling of the thermoplastic composition in the gate and/or runners, until after the article in the mold cavity is hardened, which is done with a dead air chamber around the gate bushing.
- Patent #2,828,509 to S ucker, et al . for "Plastic Molding Machines” This covers a plastic molding machine, with the nozzle extending to the molding cavity. The nozzle is merely guided to the seat of the bushing for filling of the die.
- This patent covers a heat conducting core located internally of each delivery channel. This is to heat the material going or flowing from the nozzle to the molding dies or cavities.
- Patent #3,698,849 to Czerski for "Injection Molding Assembly”. This patent covers a molding assembly which is suitable for use in the manufactu of cellular plastics particles, wherein the injection nozzle is insulated from the sprue bush by a thermally insulating element between the outlet end of the nozzle and the sprue bush.
- Patent #3,945,535 to Leiste et al . for "Injection Molding Apparatus”. This patent covers apparatus for injecting plasticized material containing a foaming agent into a mold from an extruder, and a heating element to maintain the nozzle needle at high temperature.
- Patent #4,069,003 to Cecchi for "Injection Molding Apparatus", which describes a sprue bushing provided with a plurality of grooves in its bore.
- This patent describes a sprue bushing, the temperature of which is controlled by water flowing through channels in the bushing.
- Patent #4,273,525 to Reitan for "Injection Mold Bushing” which describes a sprue bushing having heating and cooling means.
- Patent #4,345,892 to Schulte et al . for "Injection Molding Die With Heavy-Duty Sprue Bush”. This patent covers a heated sprue bush along with air gaps, and injection molding gates are perpendicular to the longitudinal axis of the sprue bush.
- Patent #4,173,448 for Actuating Mechanism For Gate Valve of Injection Nozzle.
- This patent covers a "nozzle body" which is entirely different from a sprue bushing described in this Shaw invention.
- Patent 4,268,241 for Heated Injection Nozzle. This patent is for a heated nozzle and a sheath of resinous material around the nozzle — nozz
- O PI is highly heat conductive.
- This patent is not concerned with a "sprue «, bushing" as described in this Shaw invention. • * ⁇ It is an object of this invention to describe a sprue bushing insulated from the die so that the plasticized material maintains its 5 temperature for more efficient molding operation.
- Another object of this invention is to disclose means to insulate the sprue bushing from the die in molding of plastic materials.
- Another object of this invention is to reduce the temperature difference which exists between the nozzle and sprue bushing in injection 10 molding.
- This invention is to disclose means for insulating the sprue bushing from the die, so that the plasticized or melted material will maintain more closely its temperature coming out of the nozzle and through the sprue bushing.
- Another object of this invention is to prevent excessive temperature 15 variance of the plasticized compound or material on being fed into and through the sprue bushing.
- Another object of this invention is to disclose in a plastic molding apparatus comprising a die mounted in a press, the improvement consisting of an insulated sprue bushing mounted in said die, said sprue bushing 20 insulated from the die block at the shoulder and stem section of said sprue bushing.
- Another object of this invention is to prevent nozzle "freeze off" by means of an insulated sprue bushing.
- Another object of this invention is to disclose a sprue bushing with 25 an insulating collar molded thereon.
- Another object of this invention is to disclose an insulating collar for a sprue bushing mounting, said insulating collar to be removable from said sprue bushing.
- Another object of this invention is to reduce the temperature 30 difference between the nozzle and sprue bushing in plastic molding, by ⁇ means of an insulated sprue bushing, between said sprue bushing and the die.
- Fig. 2 End View of sprue bushing and insulating section wherein: 1. - Stem of sprue bushing 2. - Passage way through sprue bushing
- FIG. 3 Side View of insulating section ring wherein: 7. - Insulating section
- Fig. 1 shows the plastic insulating material molded onto the sprue bushing which had been machined "out” so that the plastic insulating material is molded onto the sprue bushing in the machined out section.
- Fig. 4 shows the plastic insulating material as a separate ring and shoulder section to be inserted into the machined out die block. The sprue bushing is then inserted in the die block holding the insulating section between said die block and the sprue bushing section.
- This invention discloses means to insulate a sprue bushing from the die in plastic molding.
- the sprue bushing is insulated at its shoulder and stem section from the die so that as plastic compound is forced from the press nozzle to and through the sprue bushing that the temperature of the compound is not adversely affected to cause problems in molding.
- the die temperature is below the congealing or freezing temperature of the plastic material.
- the sprue bushing is at or near the die temperature, thus when melted plastic compound is injected from the nozzle into and through the sprue bushing that the temperature of the melted plastic is reduced causing flow problems from the sprue bushing into the runners through the die gates and into the cavities of the dies.
- thermoset molding the die is at a high temperature for cure of the compound such as phenolic melamine or alkyd compound.
- thermoset molding The temperature of the die in thermoset molding is in the vicinity of 162.8 - 183°C, thus in conventional molding the sprue bushing is at or near this temperature.
- thermoplastic compounds can b reduced, and other advantages obtained as indicated in the fiv examples listed as follows: Case 1. Adaptor of 6/6 40% GF Nylon a. reduced nozzle temperature from 329.4 to 271.1° C b. eliminate small bent cores from cold flow resin. c. improved flatness & surface appearance. d. eliminated gas trapping. e. eliminated sprue sticking. f. eliminated nozzle freeze-off. Case 2. Fuse Holder of 30% Glass filled PBT a. reduced nozzle temperature from 260 to 232.2 C. b. eliminated nozzle freeze-off. c eliminated sprue sticking. d. eliminated voids in thick section. e.
- one method is to machine out a section of the sprue bushing and form the insulating section by injec molding phenolic compound to fill the machined out segment of the shoulder and section of the stem.
- the molded segment wil be of the same diameter as the sprue bushing stem.
- the thick of the molded section is of the order of 2.54 to 5.08 mm.
- Another method of insulating the shoulder and section of stem of the sprue bushing is to insert a molded cylindrical section called insulation section ring to be mounted between the shoulder and stem section of the sprue bushing and the die as shown in Fig. 4.
- This insulated section ring as shown in Fig. 3 can be molded of pheno'lic compound and have a wall thickness of 2.54 to 5.08 mm.
- Suitable materials for the sprue bushing insulating segment or ring are phenolic compounds or polyi ide thermoset compounds.
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
The insulation (3) for the sprue bushing comprises a thermoset molding to insulate or break the heat flow between the sprue bushing shoulder (5) and neck section of the stem (1) of the sprue bushing.
Description
INSULATED SPRUE BUSHING IN PLASTIC MOLDING APPARATUS
Apparatus for molding of plastics, particularly injection molding, comprises dies mounted on die blocks which blocks in turn are mounted on the platens of a press. Molten or plasticized material is forced by pressure out of a nozzle through a sprue bushing which sprue bushing serves to transmit or conduct the plasticized material from the nozzle to the runners which feed the plasticized material to the various cavities.
There is, however, a problem in molding thermoplastics as outlined above, in that due to the temperature difference between the nozzle and the sprue bushing, it is necessary to heat the material at the nozzle to an excessively high temperature in order to be sure the plasticized material or compound will feed into the die. The high temperature required as indicated above can cause break down of the plasticized material, while without adequate heating, cold spots develop on passage from the nozzle through the sprue bushing into the runners, then to the cavities. As for injection molding of thermoset compounds, it is important that the sprue bushing be insulated from the heated die to prevent premature curing or "setting" of the plasticized material or compound prior to filling of the molding cavities.
In view of above then, an insulated sprue bushing is useful in thermoplastic and thermoset molding.
Several U.S. patents have been issued pertaining to various sprue bushings, as follows.
Patent 2,227,966 to E sley for "Injection Type Mold", which states: An object of the invention is to substantially retard cooling of the thermoplastic composition in the gate and/or runners, until after the article in the mold cavity is hardened, which is done with a dead air chamber around the gate bushing.
Patent #2,828,509 to S ucker, et al . for "Plastic Molding Machines": This covers a plastic molding machine, with the nozzle extending to the molding cavity. The nozzle is merely guided to the seat of the bushing for filling of the die. Patent #3,537,139 to Seg 'uller for "Injection Nozzle for Hot Channel -
Injection Molding Device". This patent covers a heat conducting core located internally of each delivery channel. This is to heat the material going or flowing from the nozzle to the molding dies or cavities.
Patent #3,698,849 to Czerski for "Injection Molding Assembly". This patent covers a molding assembly which is suitable for use in the manufactu of cellular plastics particles, wherein the injection nozzle is insulated from the sprue bush by a thermally insulating element between the outlet end of the nozzle and the sprue bush.
Patent #3,945,535 to Leiste et al . for "Injection Molding Apparatus". This patent covers apparatus for injecting plasticized material containing a foaming agent into a mold from an extruder, and a heating element to maintain the nozzle needle at high temperature.
Patent #4,069,003 to Cecchi for "Injection Molding Apparatus", which describes a sprue bushing provided with a plurality of grooves in its bore. Patent #4,260,348 to Graham, for "Sprue Bushing For Injection Molding
Machine". This patent describes a sprue bushing, the temperature of which is controlled by water flowing through channels in the bushing.
Patent #4,273,525 to Reitan for "Injection Mold Bushing", which describes a sprue bushing having heating and cooling means. Patent #4,279,588 to Gellert for "Hot Tip Seal". This describes a heating coil in the nozzle section.
Patent #4,345,892 to Schulte et al . for "Injection Molding Die With Heavy-Duty Sprue Bush". This patent covers a heated sprue bush along with air gaps, and injection molding gates are perpendicular to the longitudinal axis of the sprue bush.
Rees Patent #4,173,448 -- for Actuating Mechanism For Gate Valve of Injection Nozzle. This patent covers a "nozzle body" which is entirely different from a sprue bushing described in this Shaw invention.
Rees Patent 4,268,241 for Heated Injection Nozzle. This patent is for a heated nozzle and a sheath of resinous material around the nozzle — nozz
O PI
is highly heat conductive. This patent is not concerned with a "sprue «, bushing" as described in this Shaw invention. •*\ It is an object of this invention to describe a sprue bushing insulated from the die so that the plasticized material maintains its 5 temperature for more efficient molding operation.
Another object of this invention is to disclose means to insulate the sprue bushing from the die in molding of plastic materials.
Another object of this invention is to reduce the temperature difference which exists between the nozzle and sprue bushing in injection 10 molding. This invention is to disclose means for insulating the sprue bushing from the die, so that the plasticized or melted material will maintain more closely its temperature coming out of the nozzle and through the sprue bushing.
Another object of this invention is to prevent excessive temperature 15 variance of the plasticized compound or material on being fed into and through the sprue bushing.
Another object of this invention is to disclose in a plastic molding apparatus comprising a die mounted in a press, the improvement consisting of an insulated sprue bushing mounted in said die, said sprue bushing 20 insulated from the die block at the shoulder and stem section of said sprue bushing.
Another object of this invention is to prevent nozzle "freeze off" by means of an insulated sprue bushing.
Another object of this invention is to disclose a sprue bushing with 25 an insulating collar molded thereon.
Another object of this invention is to disclose an insulating collar for a sprue bushing mounting, said insulating collar to be removable from said sprue bushing.
Another object of this invention is to reduce the temperature 30 difference between the nozzle and sprue bushing in plastic molding, by ^ means of an insulated sprue bushing, between said sprue bushing and the die.
O PI
Brief Description of the Drawings
Fi g. 1 - Si de View of sprue bushing with insul ating section , wherein :
1 . - Stem of sprue bushing
2. - Passage way through sprue bushing
3. - Insulating section 4. - Seat for press nozzle
5. - Head of sprue bushing
6. - Die section
Fig. 2 - End View of sprue bushing and insulating section wherein: 1. - Stem of sprue bushing 2. - Passage way through sprue bushing
3. - Insulating section
4. - Seat for press nozzle
5. - Head of sprue bushing
Fig. 3 - Side View of insulating section ring wherein: 7. - Insulating section
8. - Shoulder section of insulating section Fig. 4 - Side View of sprue bushing mounted in die with insulating section in position at the shoulder of said sprue bushing wherein: 1. - Stem of sprue bushing 2. - Passage way through sprue bushing
3. - Insulating ring section
4. - Seat for press nozzle
5. - Head of sprue bushing
6. - Die section 7. - Sprue bushing insulator
8. - Shoulder section of insulator Fig. 1 shows the plastic insulating material molded onto the sprue bushing which had been machined "out" so that the plastic insulating material is molded onto the sprue bushing in the machined out section.
Fig. 4 shows the plastic insulating material as a separate ring and shoulder section to be inserted into the machined out die block. The sprue bushing is then inserted in the die block holding the insulating section between said die block and the sprue bushing section. Description of Invention
This invention discloses means to insulate a sprue bushing from the die in plastic molding.
In particular, the sprue bushing is insulated at its shoulder and stem section from the die so that as plastic compound is forced from the press nozzle to and through the sprue bushing that the temperature of the compound is not adversely affected to cause problems in molding.
For example, in molding of thermoplastic compounds the die temperature is below the congealing or freezing temperature of the plastic material. In this conventional molding the sprue bushing is at or near the die temperature, thus when melted plastic compound is injected from the nozzle into and through the sprue bushing that the temperature of the melted plastic is reduced causing flow problems from the sprue bushing into the runners through the die gates and into the cavities of the dies.
In thermoset molding, the die is at a high temperature for cure of the compound such as phenolic melamine or alkyd compound.
The temperature of the die in thermoset molding is in the vicinity of 162.8 - 183°C, thus in conventional molding the sprue bushing is at or near this temperature.
Thus when plasticized thermoset material is forced from the nozzle through the sprue bushing into runners through gates and into the dies, there is often a problem of filling the dies due to pre-cure of the compound on going through the sprue bushing.
Attempts have been made to eliminate the above problems, and surprisingly it has been found that insulating the sprue bushing shoulder and a section of the stem from the die, that fill of the dies are readily accomplished, and the problem of "freeze off" is eliminated.
IPO
On insulating the sprue bushing from the die as mentioned above, the nozzle temperature of thermoplastic compounds can b reduced, and other advantages obtained as indicated in the fiv examples listed as follows: Case 1. Adaptor of 6/6 40% GF Nylon a. reduced nozzle temperature from 329.4 to 271.1° C b. eliminate small bent cores from cold flow resin. c. improved flatness & surface appearance. d. eliminated gas trapping. e. eliminated sprue sticking. f. eliminated nozzle freeze-off. Case 2. Fuse Holder of 30% Glass filled PBT a. reduced nozzle temperature from 260 to 232.2 C. b. eliminated nozzle freeze-off. c eliminated sprue sticking. d. eliminated voids in thick section. e. eliminated critical knit line of cored hole. f. improved resin reprocessability. Case 3. Handle of high impact ABS a. eliminated sticking sprue. b. reduced splay and lamination. c. eliminated subgate plugging. d. improved overall part appearance. e. reduced nozzle temperature from 248.9 to 215.6 Case 4. Cover 30% Glass filled PBT SEO a. reduced nozzle temperature from 254.4° to 221.1° b. eliminated sticking sprue. c. eliminated splay and streaking. d. improved part flatness.
* Case 5. Cover SEO Polycarbonate a. reduced nozzle temperature from 310 to 276.7 C.
b. eliminated sprue sticking. c. eliminated splay and streaking.
*
SEO - Self extinguishing, zero burning
There are two ways to insulate the bushing shoulder and section of the stem; one method is to machine out a section of the sprue bushing and form the insulating section by injec molding phenolic compound to fill the machined out segment of the shoulder and section of the stem. The molded segment wil be of the same diameter as the sprue bushing stem. The thick of the molded section is of the order of 2.54 to 5.08 mm. Another method of insulating the shoulder and section of stem of the sprue bushing is to insert a molded cylindrical section called insulation section ring to be mounted between the shoulder and stem section of the sprue bushing and the die as shown in Fig. 4.
With this second method of insulating the sprue bushing section from the die block requires a machined step on the die block to allow fitting of the insulating ring in the die block to then allow mounting of the sprue bushing therein.
This insulated section ring as shown in Fig. 3 can be molded of pheno'lic compound and have a wall thickness of 2.54 to 5.08 mm. The insulating section as outlined above to have a heat transfer value of about 4 to 22 x 10 -4 σal-cm/sec-σm2 - oC.
Suitable materials for the sprue bushing insulating segment or ring are phenolic compounds or polyi ide thermoset compounds.
Claims
1.) Insulated sprue bushing in plastic molding apparatus, said apparatus comprising a die mounted in a press, the improvement consisting of an insulated sprue bushing mounted in said die, said sprue bushing insulated from the die block at the shoulder and stem section of said sprue bushing.
2.) An insulated sprue bushing of Claim 1, wherein the insulation comprises a molded thermoset section to be positioned between the sprue bushing and the die mount.
3.) An insulated sprue bushing of claim 1, the insulation consisting of a molded phenolic compound.
4.) An insulated sprue bushing of claim 1, the insulation consisting of a molded heat resistant phenolic compound.
5.) An insulated sprue bushing for plastic injection molding apparatus, the said insulated sprue bushing comprising a molded segment on the shoulder and stem of the bushing, and said molded stem end section having an outer diameter the same as the stem of the bushing.
6.) A sprue bushing insulation ring molded of plastic material comprising said plastic material comprising a thermoset material from the group consisting of phenolic compound and polyiraide thermoset compound.
f O PI
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1984600007U JPS60500001U (en) | 1982-11-22 | 1983-04-29 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US44324482A | 1982-11-22 | 1982-11-22 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1984002106A1 true WO1984002106A1 (en) | 1984-06-07 |
Family
ID=23760003
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1983/000672 WO1984002106A1 (en) | 1982-11-22 | 1983-04-29 | Insulated sprue bushing in plastic molding apparatus |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0130986A4 (en) |
JP (1) | JPS60500001U (en) |
WO (1) | WO1984002106A1 (en) |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3103039A (en) * | 1959-07-23 | 1963-09-10 | William H Robinson | Molding apparatus |
US4173448A (en) * | 1978-01-06 | 1979-11-06 | Husky Injection Molding Systems | Actuating mechanism for gate valve of injection nozzle |
US4212625A (en) * | 1978-03-14 | 1980-07-15 | Shutt George V | High speed injector for molding machines |
US4260348A (en) * | 1979-10-12 | 1981-04-07 | Graham Theodore D | Sprue bushing for injection molding machine |
US4268241A (en) * | 1978-01-06 | 1981-05-19 | Husky Injection Molding Systems | Heated injection nozzle |
US4306852A (en) * | 1979-05-07 | 1981-12-22 | Nipki Po Technologia Na Materialite | Sprueless plastic material injection molding injection apparatus |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2227263A (en) * | 1938-04-20 | 1940-12-31 | Watson Stillman Co | Injection molding device |
US3113346A (en) * | 1962-03-22 | 1963-12-10 | Bois Plastic Products Inc Du | Nozzle arrangement for hot runner plastic molds |
-
1983
- 1983-04-29 EP EP19830902007 patent/EP0130986A4/en not_active Ceased
- 1983-04-29 WO PCT/US1983/000672 patent/WO1984002106A1/en not_active Application Discontinuation
- 1983-04-29 JP JP1984600007U patent/JPS60500001U/ja active Pending
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3103039A (en) * | 1959-07-23 | 1963-09-10 | William H Robinson | Molding apparatus |
US4173448A (en) * | 1978-01-06 | 1979-11-06 | Husky Injection Molding Systems | Actuating mechanism for gate valve of injection nozzle |
US4268241A (en) * | 1978-01-06 | 1981-05-19 | Husky Injection Molding Systems | Heated injection nozzle |
US4212625A (en) * | 1978-03-14 | 1980-07-15 | Shutt George V | High speed injector for molding machines |
US4306852A (en) * | 1979-05-07 | 1981-12-22 | Nipki Po Technologia Na Materialite | Sprueless plastic material injection molding injection apparatus |
US4260348A (en) * | 1979-10-12 | 1981-04-07 | Graham Theodore D | Sprue bushing for injection molding machine |
Non-Patent Citations (1)
Title |
---|
See also references of EP0130986A4 * |
Also Published As
Publication number | Publication date |
---|---|
EP0130986A1 (en) | 1985-01-16 |
EP0130986A4 (en) | 1985-11-25 |
JPS60500001U (en) | 1985-01-17 |
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JPS5939529A (en) | Injection molding method and apparatus thereof |
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