CA2250598A1 - Apparatus for locating and sealing an injection molding nozzle - Google Patents
Apparatus for locating and sealing an injection molding nozzle Download PDFInfo
- Publication number
- CA2250598A1 CA2250598A1 CA 2250598 CA2250598A CA2250598A1 CA 2250598 A1 CA2250598 A1 CA 2250598A1 CA 2250598 CA2250598 CA 2250598 CA 2250598 A CA2250598 A CA 2250598A CA 2250598 A1 CA2250598 A1 CA 2250598A1
- Authority
- CA
- Canada
- Prior art keywords
- locating
- sealing ring
- opening
- nozzle
- shoulder
- 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.)
- Abandoned
Links
- 238000007789 sealing Methods 0.000 title claims abstract description 42
- 238000001746 injection moulding Methods 0.000 title claims abstract description 18
- 238000003780 insertion Methods 0.000 claims abstract description 4
- 230000037431 insertion Effects 0.000 claims abstract description 4
- 239000000155 melt Substances 0.000 claims description 16
- 238000010438 heat treatment Methods 0.000 claims description 8
- 229910001069 Ti alloy Inorganic materials 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 4
- 108091092889 HOTTIP Proteins 0.000 description 5
- 238000001816 cooling Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000012809 cooling fluid Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000161 steel melt Substances 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
- B29C45/2737—Heating or cooling means therefor
- B29C2045/274—Thermocouples or heat sensors
-
- 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
- B29C2045/2759—Nozzle centering or guiding means
-
- 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
- B29C2045/2761—Seals between nozzle and mould or gate
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
Injection molding apparatus wherein a heated nozzle extends into an opening in a cooled mold. The nozzle has a rear locating flange and a front locating and sealing ring made of a deformable material. In the operating position, the rear locating flange contacts a first tapered shoulder around the opening and the front locating and sealing ring contacts a second tapered shoulder around the opening. The first and second tapered shoulders are further apart than the rear locating flange and the front locating and sealing ring. Thus, during insertion of the nozzle into place in the opening and thermal expansion of the nozzle, the rear locating flange first comes into contact with the first tapered shoulder to prealign the nozzle before the front locating and sealing ring comes into contact with the second shoulder and is partially deformed thereby to very accurately align the tip of the nozzle with the gate.
Description
APPARATOB FOR LOCATING AND SEALING
AN INJECTION MOLDING NOZZLE
BACKGROUND OF THE INVENTION
This invention relates generally to injection molding and more particularly to apparatus for locating and sealing an injection molding nozzle in an opening in the mold.
Very accurate location of a heated nozzle in an opening in a cooled mold has become more and more critical for successful hot tip gating. As seen in the applicant s U.S. Patent Number 4,557,685 which issued December 10, 1985 and U. S. Patent Number 4, 768, 945 to Schmidt et al. which issued September 6, 1988 it is well known for heated injection molding nozzles used for hot tip gating to have a rear locating flange and a front seal extending therearound. Another example of hot tip gating is shown in U.S. Patent Number 5,658,604 to Gellert et al. which issued August 19, 1997 in which the front seal is provided by a threaded nozzle seal which is screwed into the front end of the nozzle.
However, the previous apparatus all has the disadvantage that extremely close tolerances are required to ensure the front end of the nozzle is accurately aligned and there is a good seal against melt leakage.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to at least partially overcome the disadvantages of the prior art by providing injection molding apparatus wherein each nozzle has a rear locating flange which prealigns the nozzle before accurate alignment by a front locating and sealing ring.
To this end, in one of its aspects, the invention provides injection molding apparatus having an integral heated nozzle extending into an opening in a mold. The opening has a rear end and a surface extending to a gate leading to a cavity. The integral heated nozzle has an elongated inner portion, an outer collar portion, and an electrical heating element. The elongated inner portion has a rear end, a front end, a melt bore extending therethrough from the rear end to the front end, and a generally cylindrical outer surface with a spiral groove extending therearound The electrical heating element is wound into the spiral groove extending around the outer surface of the inner portion and the outer collar portion fits around the inner portion adjacent the rear end of the inner portion. The surface of the opening in the mold is generally cylindrical with a first locating shoulder extending inwardly near the rear end and a second locating shoulder extending inwardly near the gate. The outer collar portion has a rear locating flange to extend outwardly into locating contact with the first inwardly extending locating shoulder of the surface of the opening in the mold. A front locating and sealing ring is mounted around the heated nozzle near the front end of the heated nozzle to provide locating contact the with the second inwardly extending locating shoulder of the surface of the opening in the mold. The distance between the first inwardly extending locating shoulder and the second inwardly extending locating shoulder being greater than the distance between the rear locating flange and the front locating and sealing ring. Thus, during insertion of the nozzle into the opening in the mold and thermal expansion of the nozzle, the rear locating flange comes into locating contact with the first inwardly extending locating shoulder of the surface of the opening in the mold to prealign the nozzle before the front locating and sealing ring comes into locating and sealing contact with the second inwardly extending locating shoulder of the surface of the opening in the mold.
Further objects and advantages of the invention will appear from the following description taken together 5 with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is a sectional view of a portion of a multi-cavity injection molding apparatus in the operating l0 position wherein each heated nozzle has a rear locating flange and a front locating and sealing ring according to a preferred embodiment of the invention, Figure 2 is an isometric view of the front end of the nozzle and the front locating and sealing ring seen in Figure 1, Figure 3 is a sectional view similar to Figure 1 showing one of the nozzles being inserted into place, Figure 4 is a sectional view showing the ribbed locating and sealing ring contacting the surface of the mold during insertion, Figure 5 is a similar view showing the ribbed locating and sealing ring fully inserted, and Figure 6 is an isometric view of a locating and sealing ring according to another embodiment of the invention.
AN INJECTION MOLDING NOZZLE
BACKGROUND OF THE INVENTION
This invention relates generally to injection molding and more particularly to apparatus for locating and sealing an injection molding nozzle in an opening in the mold.
Very accurate location of a heated nozzle in an opening in a cooled mold has become more and more critical for successful hot tip gating. As seen in the applicant s U.S. Patent Number 4,557,685 which issued December 10, 1985 and U. S. Patent Number 4, 768, 945 to Schmidt et al. which issued September 6, 1988 it is well known for heated injection molding nozzles used for hot tip gating to have a rear locating flange and a front seal extending therearound. Another example of hot tip gating is shown in U.S. Patent Number 5,658,604 to Gellert et al. which issued August 19, 1997 in which the front seal is provided by a threaded nozzle seal which is screwed into the front end of the nozzle.
However, the previous apparatus all has the disadvantage that extremely close tolerances are required to ensure the front end of the nozzle is accurately aligned and there is a good seal against melt leakage.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to at least partially overcome the disadvantages of the prior art by providing injection molding apparatus wherein each nozzle has a rear locating flange which prealigns the nozzle before accurate alignment by a front locating and sealing ring.
To this end, in one of its aspects, the invention provides injection molding apparatus having an integral heated nozzle extending into an opening in a mold. The opening has a rear end and a surface extending to a gate leading to a cavity. The integral heated nozzle has an elongated inner portion, an outer collar portion, and an electrical heating element. The elongated inner portion has a rear end, a front end, a melt bore extending therethrough from the rear end to the front end, and a generally cylindrical outer surface with a spiral groove extending therearound The electrical heating element is wound into the spiral groove extending around the outer surface of the inner portion and the outer collar portion fits around the inner portion adjacent the rear end of the inner portion. The surface of the opening in the mold is generally cylindrical with a first locating shoulder extending inwardly near the rear end and a second locating shoulder extending inwardly near the gate. The outer collar portion has a rear locating flange to extend outwardly into locating contact with the first inwardly extending locating shoulder of the surface of the opening in the mold. A front locating and sealing ring is mounted around the heated nozzle near the front end of the heated nozzle to provide locating contact the with the second inwardly extending locating shoulder of the surface of the opening in the mold. The distance between the first inwardly extending locating shoulder and the second inwardly extending locating shoulder being greater than the distance between the rear locating flange and the front locating and sealing ring. Thus, during insertion of the nozzle into the opening in the mold and thermal expansion of the nozzle, the rear locating flange comes into locating contact with the first inwardly extending locating shoulder of the surface of the opening in the mold to prealign the nozzle before the front locating and sealing ring comes into locating and sealing contact with the second inwardly extending locating shoulder of the surface of the opening in the mold.
Further objects and advantages of the invention will appear from the following description taken together 5 with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is a sectional view of a portion of a multi-cavity injection molding apparatus in the operating l0 position wherein each heated nozzle has a rear locating flange and a front locating and sealing ring according to a preferred embodiment of the invention, Figure 2 is an isometric view of the front end of the nozzle and the front locating and sealing ring seen in Figure 1, Figure 3 is a sectional view similar to Figure 1 showing one of the nozzles being inserted into place, Figure 4 is a sectional view showing the ribbed locating and sealing ring contacting the surface of the mold during insertion, Figure 5 is a similar view showing the ribbed locating and sealing ring fully inserted, and Figure 6 is an isometric view of a locating and sealing ring according to another embodiment of the invention.
DETAILED DESCRIPTION OF THE INVENTION
Reference is first made to Figure 1 which shows a portion of a multi-cavity hot tip gated injection molding system or apparatus having a melt passage 10 with branches 12 which extend outwardly in a steel melt distribution manifold 14 from a central inlet portion 16 to an integral heated nozzle 18. Each branch 12 of the melt passage 10 extends through a central melt bore 20 in one of the heated nozzles 18 to a gate 22 leading to a cavity 24. While the l0 mold 26 can have a greater number of plates depending upon the application, in this case, only a back plate 28 and a manifold plate 30 secured together by bolts 32 are shown for ease of illustration.
The melt distribution manifold 14 has a central inlet portion 34 surrounded by a locating ring 36 and is heated by an integral heating element 38. The melt distribution manifold 14 is mounted between the back plate 28 and the manifold plate 30 by a central manifold locator 40 and a number of pressure discs 42 which provide an insulative air space 44 between the heated manifold 14 and the surrounding mold 26 which is cooled by pumping a cooling fluid such as water through cooling conduits 46, The melt distribution manifold 14 is accurately aligned in place by a locating pin 48 extending outward into a cam 50 seated in the manifold plate 30. Each branch 12 of the melt passage 10 bends in a steel plug 52 seated in an opening 54 through the melt distribution manifold 14. The plug or insert 52 is very accurately aligned in place by a small prealignment pin 56 and a larger alignment and retaining pin 58.
As also seen in Figure 3, each of the heated nozzles 18 has an elongated inner portion 60 with the central bore 20 extending therethrough and an integral outer collar portion 62 fitting around its rear end 64.
The inner portion 60 has a cylindrical outer surface 66 with a spiral groove 68 into which an electrical heating element 70 is wound. The electrical heating element 70 has terminal portions 72 extending outwardly through the outer collar portion 62. Each heated nozzle 18 has a tip insert 74 integrally brazed into a seat 76 in the front end 78 of its inner portion 60. The tip insert 74 has a melt bore 80 extending therethrough and a tip 82 which must be very accurately aligned with the gate 22. As best seen in Figures 4 and 5, the heated nozzle 18 also has a locating and sealing ring backer sleeve 84 integrally brazed around its inner portion 60 adjacent its front end 78. In this embodiment, the locating and sealing ring backer sleeve 84 has a hole 85 into which a thermocouple element 87 extends to control the operating temperature. The locating and sealing ring backing sleeve 84 has an outer surface 86 with a forwardly facing outer shoulder 88. A ribbed locating and sealing ring 90 is heat shrunk around the outer surface 86 of the locating and sealing ring backer sleeve 84 to abut against the outer shoulder 88. The ribbed locating and sealing ring 90 is made of a material such as a soft titanium alloy which is suitably deformable as described below.
Each heated nozzle i8 extends into an elongated opening 92 in the mold 26. As can be seen, the elongated l0 opening 92 has a surface 94 which is generally cylindrical with a tapered portion 96 extending inwardly to the gate 22. The outer collar portion 62 of the heated nozzle 10 has a forwardly extending locating flange 98 which abuts against an inwardly extending seat or shoulder 100 on the surface 94 of the opening 92 in the mold 26. The surface 94 of the opening 92 also has a first locating shoulder 102 which tapered inwardly near its rear end 106 and a second locating shoulder 104 which tapers inwardly near the gate 2 2 . The first locating shoulder 102 tapers inwardly to f it around the rear locating flange 98 to accurately locate the rear end 108 of the heated nozzle 18 in the operating position shown in Figure 1. The second locating shoulder 104 tapers inwardly to fit around the front locating and sealing ring 90 to accurately locate the tip 82 of the tip insert 74 with the gate 22.
Reference is first made to Figure 1 which shows a portion of a multi-cavity hot tip gated injection molding system or apparatus having a melt passage 10 with branches 12 which extend outwardly in a steel melt distribution manifold 14 from a central inlet portion 16 to an integral heated nozzle 18. Each branch 12 of the melt passage 10 extends through a central melt bore 20 in one of the heated nozzles 18 to a gate 22 leading to a cavity 24. While the l0 mold 26 can have a greater number of plates depending upon the application, in this case, only a back plate 28 and a manifold plate 30 secured together by bolts 32 are shown for ease of illustration.
The melt distribution manifold 14 has a central inlet portion 34 surrounded by a locating ring 36 and is heated by an integral heating element 38. The melt distribution manifold 14 is mounted between the back plate 28 and the manifold plate 30 by a central manifold locator 40 and a number of pressure discs 42 which provide an insulative air space 44 between the heated manifold 14 and the surrounding mold 26 which is cooled by pumping a cooling fluid such as water through cooling conduits 46, The melt distribution manifold 14 is accurately aligned in place by a locating pin 48 extending outward into a cam 50 seated in the manifold plate 30. Each branch 12 of the melt passage 10 bends in a steel plug 52 seated in an opening 54 through the melt distribution manifold 14. The plug or insert 52 is very accurately aligned in place by a small prealignment pin 56 and a larger alignment and retaining pin 58.
As also seen in Figure 3, each of the heated nozzles 18 has an elongated inner portion 60 with the central bore 20 extending therethrough and an integral outer collar portion 62 fitting around its rear end 64.
The inner portion 60 has a cylindrical outer surface 66 with a spiral groove 68 into which an electrical heating element 70 is wound. The electrical heating element 70 has terminal portions 72 extending outwardly through the outer collar portion 62. Each heated nozzle 18 has a tip insert 74 integrally brazed into a seat 76 in the front end 78 of its inner portion 60. The tip insert 74 has a melt bore 80 extending therethrough and a tip 82 which must be very accurately aligned with the gate 22. As best seen in Figures 4 and 5, the heated nozzle 18 also has a locating and sealing ring backer sleeve 84 integrally brazed around its inner portion 60 adjacent its front end 78. In this embodiment, the locating and sealing ring backer sleeve 84 has a hole 85 into which a thermocouple element 87 extends to control the operating temperature. The locating and sealing ring backing sleeve 84 has an outer surface 86 with a forwardly facing outer shoulder 88. A ribbed locating and sealing ring 90 is heat shrunk around the outer surface 86 of the locating and sealing ring backer sleeve 84 to abut against the outer shoulder 88. The ribbed locating and sealing ring 90 is made of a material such as a soft titanium alloy which is suitably deformable as described below.
Each heated nozzle i8 extends into an elongated opening 92 in the mold 26. As can be seen, the elongated l0 opening 92 has a surface 94 which is generally cylindrical with a tapered portion 96 extending inwardly to the gate 22. The outer collar portion 62 of the heated nozzle 10 has a forwardly extending locating flange 98 which abuts against an inwardly extending seat or shoulder 100 on the surface 94 of the opening 92 in the mold 26. The surface 94 of the opening 92 also has a first locating shoulder 102 which tapered inwardly near its rear end 106 and a second locating shoulder 104 which tapers inwardly near the gate 2 2 . The first locating shoulder 102 tapers inwardly to f it around the rear locating flange 98 to accurately locate the rear end 108 of the heated nozzle 18 in the operating position shown in Figure 1. The second locating shoulder 104 tapers inwardly to fit around the front locating and sealing ring 90 to accurately locate the tip 82 of the tip insert 74 with the gate 22.
The distance between the first locating shoulder 102 and the second locating shoulder 104 is greater than the distance between the rear locating flange 98 and the front locating and sealing ring 90. Thus, as clearly seen in Figure 3, when each nozzle 10 is inserted into one of the elongated openings 92 in the mold 26, the rear locating flange 98 of the outer collar portion 62 contacts the first locating shoulder 102 before the front locating and sealing ring 90 contacts the second locating shoulder 104. The contact between the rear locating flange 98 and the first locating shoulder 102 when the nozzle 10 is partially inserted into the opening 92 aligns the nozzle 18 so the tip 82 of the tip insert 74 is first prealigned with the gate 22. Then, as the nozzle 18 is further inserted into the elongated opening 92, the front locating and sealing ring 90 contacts the second locating shoulder 104 as seen in Figure 4 which more accurately aligns the tip 82 of the tip insert 74 with the gate 22.
Finally, when the melt distribution manifold 14 and the nozzles 18 are heated to the operating temperature, thermal expansion drives the front locating and sealing ring 90 further forward against the second locating shoulder 104. As seen in Figure 5, this deforms the ribs 110 sufficiently to very accurately locates the tip 82 of the tip insert 74 with the gate 22. The deformed locating and sealing ring 90 also seals against the second locating shoulder 104 to prevent melt leakage from the space 112 around the tip insert 74 into the insulative air space 114 around the melt distribution manifold 14. In this final 5 operating position, the locating flange 98 of the outer collar portion 62 abuts against the seat 100 extending around the surface 94 of the elongated opening in the mold.
As seen in Figure 6, in another embodiment the locating and sealing ring 90 which is made of a suitably l0 deformable material such as a soft titanium alloy can be made with a cylindrical outer surface 116 rather than with the ribs 110 seen in the first embodiment.
In use, the system is assembled as shown in Figure 1. Electrical power is applied to the heating elements 38, 70 in the melt distribution manifold 14 and the nozzles 18 to heat them to a predetermined operating temperature. Pressurized melt is then supplied from a molding machine (not shown) to a central inlet 118 of the melt passage 10 according to a predetermined cycle. The melt flows through the melt distribution manifold 14 and the heated nozzles 18 into the cavities 24. After the cavities 24 are filled and a suitable packing and cooling period has expired, injection pressure is released. The mold 26 is then opened to eject the molded product. After ejection, the mold 26 is closed and the cycle is repeated continuously every 15 to 30 seconds with a frequency depending upon the wall thickness and number and size of the cavities 24 and the exact material being molded.
While the description of the injection molding apparatus wherein each nozzle is first prealigned by a rear locating flange and then accurately located by a front locating and sealing ring has been given with respect to preferred embodiments, it will be evident that various other modifications are possible without departing from the scope of the invention as understood by those skilled in the art and as defined in the following claims. For instance, the mold can be shaped to have several gates around each nozzle and the tip insert 74 can be shaped to provide multiple hot tip or edge gate molding.
Finally, when the melt distribution manifold 14 and the nozzles 18 are heated to the operating temperature, thermal expansion drives the front locating and sealing ring 90 further forward against the second locating shoulder 104. As seen in Figure 5, this deforms the ribs 110 sufficiently to very accurately locates the tip 82 of the tip insert 74 with the gate 22. The deformed locating and sealing ring 90 also seals against the second locating shoulder 104 to prevent melt leakage from the space 112 around the tip insert 74 into the insulative air space 114 around the melt distribution manifold 14. In this final 5 operating position, the locating flange 98 of the outer collar portion 62 abuts against the seat 100 extending around the surface 94 of the elongated opening in the mold.
As seen in Figure 6, in another embodiment the locating and sealing ring 90 which is made of a suitably l0 deformable material such as a soft titanium alloy can be made with a cylindrical outer surface 116 rather than with the ribs 110 seen in the first embodiment.
In use, the system is assembled as shown in Figure 1. Electrical power is applied to the heating elements 38, 70 in the melt distribution manifold 14 and the nozzles 18 to heat them to a predetermined operating temperature. Pressurized melt is then supplied from a molding machine (not shown) to a central inlet 118 of the melt passage 10 according to a predetermined cycle. The melt flows through the melt distribution manifold 14 and the heated nozzles 18 into the cavities 24. After the cavities 24 are filled and a suitable packing and cooling period has expired, injection pressure is released. The mold 26 is then opened to eject the molded product. After ejection, the mold 26 is closed and the cycle is repeated continuously every 15 to 30 seconds with a frequency depending upon the wall thickness and number and size of the cavities 24 and the exact material being molded.
While the description of the injection molding apparatus wherein each nozzle is first prealigned by a rear locating flange and then accurately located by a front locating and sealing ring has been given with respect to preferred embodiments, it will be evident that various other modifications are possible without departing from the scope of the invention as understood by those skilled in the art and as defined in the following claims. For instance, the mold can be shaped to have several gates around each nozzle and the tip insert 74 can be shaped to provide multiple hot tip or edge gate molding.
Claims (7)
1. In injection molding apparatus having at least one integral heated nozzle extending into an opening in a mold, the opening having a rear end and a surface extending to at least one gate leading to a cavity, the integral heated nozzle having an elongated inner portion, an outer collar portion, and an electrical heating element, the elongated inner portion having a rear end, a front end, a melt bore extending therethrough from the rear end to the front end, and a generally cylindrical outer surface with a spiral groove extending therearound, the electrical heating element being wound into the spiral groove extending around the outer surface of the inner portion and the outer collar portion fitting around the inner portion adjacent the rear end of the inner portion, the improvement wherein:
the surface of the opening in the mold is generally cylindrical with a first locating shoulder extending inwardly near the rear end and a second locating shoulder extending inwardly near the gate, the outer collar portion has a rear locating flange to extend outwardly into locating contact with the first inwardly extending locating shoulder of the surface of the opening in the mold, and a front locating and sealing ring is mounted around the heated nozzle near the front end of the heated nozzle to provide locating contact the with the second inwardly extending locating shoulder of the surface of the opening in the mold, the distance between the first inwardly extending locating shoulder and the second inwardly extending locating shoulder being greater than the distance between the rear locating flange and the front locating and sealing ring whereby, during insertion of the nozzle into the opening in the mold and thermal expansion of the nozzle, the rear locating flange comes into locating contact with the first inwardly extending locating shoulder of the surface of the opening in the mold to prealign the nozzle before the front locating and sealing ring comes into locating and sealing contact with the second inwardly extending locating shoulder of the surface of the opening in the mold.
the surface of the opening in the mold is generally cylindrical with a first locating shoulder extending inwardly near the rear end and a second locating shoulder extending inwardly near the gate, the outer collar portion has a rear locating flange to extend outwardly into locating contact with the first inwardly extending locating shoulder of the surface of the opening in the mold, and a front locating and sealing ring is mounted around the heated nozzle near the front end of the heated nozzle to provide locating contact the with the second inwardly extending locating shoulder of the surface of the opening in the mold, the distance between the first inwardly extending locating shoulder and the second inwardly extending locating shoulder being greater than the distance between the rear locating flange and the front locating and sealing ring whereby, during insertion of the nozzle into the opening in the mold and thermal expansion of the nozzle, the rear locating flange comes into locating contact with the first inwardly extending locating shoulder of the surface of the opening in the mold to prealign the nozzle before the front locating and sealing ring comes into locating and sealing contact with the second inwardly extending locating shoulder of the surface of the opening in the mold.
2. Injection molding apparatus as claimed in claim 1 wherein both the first inwardly extending locating shoulder and the second inwardly extending locating shoulder of the surface of the opening in the mold are at least partially tapered inwardly.
3. Injection molding apparatus as claimed in claim 2 wherein the at least one heated nozzle has a locating and sealing ring stopper sleeve integrally mounted around the inner portion adjacent the front end of the inner portion, the locating and sealing ring stopper sleeve having a cylindrical front outer surface around which the locating and sealing ring fits and a forwardly facing shoulder against which the locating and sealing ring abuts.
4. Injection molding apparatus as claimed in claim 3 wherein the locating and sealing ring is suitable deformable.
5. Injection molding apparatus as claimed in claim 4 wherein the locating and sealing ring is generally cylindrical.
6. Injection molding apparatus as claimed in claim wherein the ring has a ribbed outer surface.
7. Injection molding apparatus as claimed in claim 6 wherein the locating and sealing ring is made of a soft titanium alloy.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2250598 CA2250598A1 (en) | 1998-10-16 | 1998-10-16 | Apparatus for locating and sealing an injection molding nozzle |
| PCT/CA1999/000909 WO2000023244A1 (en) | 1998-10-16 | 1999-10-04 | Injection molding nozzle apparatus |
| AU58460/99A AU5846099A (en) | 1998-10-16 | 1999-10-04 | Injection molding nozzle apparatus |
| DE19983681T DE19983681T1 (en) | 1998-10-16 | 1999-10-04 | Injection molding nozzle apparatus |
| US09/610,009 US6318990B1 (en) | 1998-10-16 | 2000-07-03 | Injection molding nozzle apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2250598 CA2250598A1 (en) | 1998-10-16 | 1998-10-16 | Apparatus for locating and sealing an injection molding nozzle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2250598A1 true CA2250598A1 (en) | 2000-04-16 |
Family
ID=4162915
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2250598 Abandoned CA2250598A1 (en) | 1998-10-16 | 1998-10-16 | Apparatus for locating and sealing an injection molding nozzle |
Country Status (4)
| Country | Link |
|---|---|
| AU (1) | AU5846099A (en) |
| CA (1) | CA2250598A1 (en) |
| DE (1) | DE19983681T1 (en) |
| WO (1) | WO2000023244A1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6318990B1 (en) * | 1998-10-16 | 2001-11-20 | Mold-Masters Limited | Injection molding nozzle apparatus |
| FR2876619B1 (en) * | 2004-10-15 | 2007-01-05 | Delachaux Sa Sa | INJECTION-MOLDING DEVICE WITH SEAL STRENGTHENED BETWEEN INJECTION NOZZLE AND MOLDING MATRIX |
| DE102006041329B3 (en) * | 2006-09-01 | 2008-01-17 | Sfr Formenbau Gmbh | Injection nozzle for taking molten mass into plastic injection mold has tip or core with external thread acting with internal thread of sealing ring |
| FR3083464B1 (en) | 2018-07-03 | 2022-06-24 | Lethiguel | METHOD AND DEVICE FOR CONTROLLING THE LOCAL TEMPERATURE OF A PART DURING ITS MANUFACTURE BY MOLDING |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA1261573A (en) * | 1987-10-16 | 1989-09-26 | Harald H. Schmidt | Injection molding nozzle having grounded heating element brazed into pointed tip |
| US5032078A (en) * | 1988-07-11 | 1991-07-16 | Salvatore Benenati | Assembly of injection molding manifold, nozzles and mold |
| DE68921711T2 (en) * | 1988-12-05 | 1995-07-13 | Mold Masters Ltd | Injection molding device with fluid-cooled inserts. |
| DE4028660A1 (en) * | 1990-09-10 | 1992-03-26 | Incoe International Inc Zweign | HOT CHANNEL DISTRIBUTION SYSTEM |
| CA2187497C (en) * | 1996-10-09 | 2005-06-28 | Jobst Ulrich Gellert | Injection molding nozzle guide and sealing ring |
-
1998
- 1998-10-16 CA CA 2250598 patent/CA2250598A1/en not_active Abandoned
-
1999
- 1999-10-04 DE DE19983681T patent/DE19983681T1/en not_active Withdrawn
- 1999-10-04 AU AU58460/99A patent/AU5846099A/en not_active Abandoned
- 1999-10-04 WO PCT/CA1999/000909 patent/WO2000023244A1/en active Application Filing
Also Published As
| Publication number | Publication date |
|---|---|
| AU5846099A (en) | 2000-05-08 |
| DE19983681T1 (en) | 2002-01-31 |
| WO2000023244A1 (en) | 2000-04-27 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |