MOLD ASSEMBLY FOR THE PRODUCTION OF PET PREFORM AND SIMILAR PLASTIC PRODUCTS

Abstract

The invention relates to a mold assembly used in the production of plastic injection pet preforms and similar plastic products. The invention comprises the jaw (10) that forms the mouth of the PET preform on the injection mold and has the first conical jaw ring (70) on one side and the second conical jaw ring (80) on the other side, the cavity (20), which is locked to the side of the jaw (10) with the first conical jaw ring (70), by means of the cavity ring (50) connected to the upper surface and forming the outer wall of the PET preform, the locking ring (40) that is locked to the side of the jaw (10) with the second conical jaw ring (80) by means of the core ring (60) connected to its upper surface, the core (30) that is connected on the locking ring (40) and forms the inner wall of the PET preform.

Claims

1. Mold assembly used in the plastic injection pet preform production industry, characterized in that; it comprises, the jaw (10), which is located on the injection mold to form the mouth of the PET preform, including circular bulge (11), on its lower surface, extending upwards and downwards in accordance with the mouth structure of the PET preform, it further includes jaw channel (12) in the form of an inward recess around the outer edge of the bulges (11), the first conical jaw ring (70) located in the jaw channel (12) on one side of the jaw (10) and whose outer surface is conical form, The second conical jaw ring (80) located inside the jaw channel (12) on the other side of the jaw (10) and whose outer surface is conical form, The cavity (20), which is locked to the side of the jaw (10) wherein the first conical jaw ring (70) is on said side, by means of the connected cavity ring (50) on the cavity channel (21) located on its upper surface and forming the outer wall of the PET preform, The locking ring (40), which is locked to the side of the jaw (10) wherein the second conical jaw ring (80) is on said side, by means of the core ring (60) connected to the locking channel (41) located on its upper surface, The core (30) that is connected on the locking ring (40) and forms the inner wall of the PET preform.

2. Mold assembly according to claim 1, characterized in that; it comprises the first conical jaw ring (70) having conical outer surface, that enables the cavity (20) to be locked to the jaw (10) by being embedded in the cavity ring (50) with a conical inner surface.

3. Mold assembly according to claim 1, characterized in that; it comprises the second conical jaw ring (80) having conical outer surface, that enables the locking ring (40) to be locked to the jaw (10) by being embedded in the core ring (60) with a conical inner surface.

4. Mold assembly according to claim 1, characterized in that; it comprises jaw welding surface (13) with conical form, which is formed on the outer surface of the bulges (11) by means of the filler welding processed in machining machines and applied to the outer surface of the bulges (11) by laser welding machine or other welding methods by making suitable welding seams, in order to ensure that the said jaw (10) is connected to each other with the locking ring (40).

5. Mold assembly according to claim 1, characterized in that; it comprises locking welding surface (42) with conical form, which is formed on the upper-inner surface of the locking ring (40) by means of the filler welding processed in machining machines and applied to the upper-inner surface of the locking ring (40) by laser welding machine or other welding methods by making suitable welding seams, in order to ensure that the said jaw (10) is connected to each other with the locking ring (40).

6. Mold assembly according to claim 1, characterized in that; it comprises cavity welding surface (22) with conical form, which is formed on the upper-inner surface of the cavity (20) by means of the filler welding processed in machining machines and applied to the upper-inner surface of the cavity (20) by laser welding machine or other welding methods by making suitable welding seams, in order to ensure that the said jaw (10) is connected to each other with the cavity (20).

Description

FIGURES TO HELP UNDERSTAND THE INVENTION

[0020] FIG. 1, is the cross-sectional view of the mold assembly of the invention.

[0021] FIG. 2, is the disassembled view of the jaw of the mold assembly, the first conical jaw ring and the second conical jaw ring.

[0022] FIG. 3a, is a perspective view of the jaw of the mold assembly, the first conical jaw ring and the second conical jaw ring in assembled form.

[0023] FIG. 3b, is the front view of the jaw of the mold assembly, the first conical jaw ring and the second conical jaw ring in assembled form.

[0024] FIG. 4, is the disassembled view of the cavity and cavity ring of the mold assembly.

[0025] FIG. 5a, is the perspective view of the cavity and the cavity ring of the mold assembly in assembled form.

[0026] FIG. 5b, is the sectional view of the cavity and the cavity ring of the mold assembly in assembled form.

[0027] FIG. 6, is the disassembled view of the locking ring and core ring of the mold assembly.

[0028] FIG. 7a, is a perspective view of the locking ring and core ring of the mold assembly in assembled form.

[0029] FIG. 7b, is the sectional view of the locking ring and the core ring of the mold assembly in assembled form.

[0030] FIG. 8a, the top perspective view of the jaw of the mold assembly in the alternative embodiment of the present invention.

[0031] FIG. 8b, the bottom perspective view of the jaw of the mold assembly in the alternative embodiment of the invention.

[0032] FIG. 9, is the perspective view of the cavity of the mold assembly in the alternative embodiment of the invention.

[0033] FIG. 10, is the perspective view of the locking ring of the mold assembly in the alternative embodiment of the invention.

[0034] FIG. 11, is the sectional view of the mold assembly in the alternative embodiment of the invention.

EXPLANATION OF THE PART REFERENCES

[0035] 10. Jaw [0036] 11. Bulge [0037] 12. Jaw channel [0038] 13. Jaw welding surface [0039] 20. Cavity [0040] 21. Cavity channel [0041] 22. Cavity welding surface [0042] 30. Core [0043] 40. Locking ring [0044] 41. Locking channel [0045] 42. Locking welding surface [0046] 50. Cavity ring [0047] 60. Core ring [0048] 70. First conical jaw ring [0049] 80. Second conical jaw ring

DETAILED DESCRIPTION OF THE INVENTION

[0050] In this detailed description, the preferred alternatives of the inventive mold assembly are explained only for a better understanding of the subject and without any restrictive effect.

[0051] In FIG. 1, the sectional view of the mold assembly subject to the invention is given. Accordingly, the mold assembly generally comprises the jaw (10) that forms the mouth of the PET preform on the injection mold and has the first conical jaw ring (70) on its one side and the second conical jaw ring (80) on its other side, the cavity (20) which is locked to the side of the jaw (10) with the first conical jaw ring (70) by means of the cavity ring (50) connected to its upper surface and forming the outer wall of the PET preform, the locking ring (40) that is locked to the side of the jaw (10) with the second conical jaw ring (80) by means of the core ring (60) connected to its upper surface, the core (30) that is connected to the locking ring (40) and forms the inner wall of the PET preform.

[0052] The jaw (10) is a movable structure located on the injection mold to form the mouth of the PET preform. As seen in FIG. 2, on the lower and upper surfaces of the jaw (10), there is a bulge (11) extending upwards and downwards in a circular form in accordance with the mouth structure of the PET preform. The jaw channel (12) in the form of an inward recess is opened around the outer edge of the bulges (11) extending upwards and downwards on the lower and upper surfaces of the jaw (10). The first conical jaw ring (70) and the second conical jaw ring (80), which have a circular and external conical form in accordance with the jaw channel (12), are embedded in the jaw channels (12) as seen in FIGS. 3a and 3b.

[0053] As seen in FIG. 4, a cavity channel (21) is opened on the upper surface of the cavity (20) forming the outer wall of the PET preform and, as seen in FIGS. 5a and 5b, a cavity ring (50) with a conical inner surface is embedded inside the cavity channel (21).

[0054] As can be seen in FIG. 6, a locking channel (41) is formed on the upper surface of the locking ring (40), which is in circular form, and the core ring (60) with a conical inner surface is connected on the said locking channel (41) as seen in FIGS. 7a and 7b. The locking ring (40) ensures the fixation of the core (30), which is placed in the cavity (20) passing through the jaw (10) to form the inner wall of the PET preform, on the jaw (10).

[0055] The Assembly of the Mold Assembly Subject to the Invention is Carried Out as Follows.

[0056] To form the mouth part of the PET preform, the jaw (10) which is located on the injection mold and has the first conical jaw ring (70) on one side and the second conical jaw ring (80) on the other side and the cavity ring (50) that is in connection with the upper surface of the cavity (20), is placed jaw (10) side on which the first conical jaw ring (70) is positioned. The cavity (20) forming the outer wall of the PET preform is locked to the jaw (10) by bearing the inner surface of the first conical jaw ring (70) in conical form inside the conical shaped cavity ring (50).

[0057] The locking ring (40) in connection with the core ring (60) from its upper surface, is placed on the side of the jaw (10) with the second conical jaw ring (80). The locking ring (40) is locked to the jaw (10) by bearing the inner surface of the second conical jaw ring (80) with a conical outer surface inside the core ring (60) in conical form. The mold assembly is made ready for use by connecting the core (30) forming the inner wall of the PET preform onto the locking ring (40).

[0058] During the production of PET preform, the need to completely replace the locking ring (40), jaw (10) or cavity (20) is prevented during the abrasion that occurs during the combination of the jaw (10) with the cavity (20) and the locking ring (40). By replacing the cavity ring (50), the core ring (60), the first conical jaw ring (70) and the second conical jaw ring (80), the abrasion problem has been eliminated.

[0059] In the alternative embodiment of the invention, in order to prevent the abrasion that occurs during the combination of the jaw (10) with the cavity (20) and the locking ring (40), there are no jaw channels (12) around the outer edge of the bulges (11) on the lower and upper surfaces of the jaw (10) in accordance with the mouth structure of the PET preform. Filler welding is performed on the outer surface of the said bulges (11) by applying appropriate welding seams with laser welding machine or other welding methods as seen in FIGS. 8a and 8b. The weld seams thrown in sufficient thickness are then processed on suitable machining benches and the outer surfaces of the bulges (11) are turned into conical form, and the desired surface quality is achieved by obtaining the jaw welding surface (13) on the outer surface of the bulges (11). The same process is applied for the cavity (20) and the locking ring (40).

[0060] There is no cavity channel (21) on the upper surface of the cavity (20). Fill welding is performed on the upper inner surface of the cavity (20) by applying appropriate welding seams with laser welding machine or other welding methods as seen in FIG. 9. The weld seams thrown in sufficient thickness are then processed on suitable machining benches and the upper inner surface of the cavity (20) is turned into a conical form, and the cavity welding surface (22) is obtained on the upper inner surface of the cavity (20) and the desired surface quality is achieved.

[0061] There is no locking channel (41) on the upper surface of the locking ring (40). Filler welding is performed on the upper inner surface of the locking ring (40) by applying appropriate weld seams by laser welding machine or other welding methods as seen in FIG. 10. The weld seams thrown in sufficient thickness are then processed on suitable machining machines and the upper inner surface of the locking ring (40) is brought into a conical form, and the desired surface quality is achieved by obtaining the locking welding surface (42) on the upper inner surface of the locking ring (40).

[0062] In the alternative embodiment of the invention mentioned above, the cavity (20) is placed on one side of the jaw (10) and the locking ring (40) on the other side, in order to fix the jaw (10), the cavity (20) and the locking ring (40) to each other, as seen in FIG. 11. In the meantime, the jaw welding surface (13) located on the outer surface of the protrusion (11) on one side of the jaw (10) is locked to the conical cavity welding surface (22) formed on the inner surface of the cavity (20) and the jaw welding surface (13) located on the outer surface of the protrusion (11) on the other side of the jaw (10) is also locked by engaging the conical shaped locking welding surface (42) formed on the inner surface of the locking ring (40) by engaging and the mold assembly is made ready for use.