A die lip, bottle blank mouth forming structure and injection mold

Abstract

A die lip, a bottle blank mouth molding structure and an injection mold, comprising two separable half-die lip components whose at least non-molding structures are symmetrical about a parting plane, wherein cooling water channels are provided inside the half-die lip components for cooling the molding structure of the half-die lip components, wherein the cooling water channels include a first side water channel and a second side water channel at least partially located on both sides of a first plane, wherein the cooling water channels inside the die lip are continuous and complete in the circumferential direction, and can provide circumferentially uniform cooling for the molding structure of the die lip, thereby avoiding poor cooling effect on the corresponding part of the molding structure due to the lack of cooling water channels at some positions on the circumference, thereby causing defects such as white mist and excessive crystallization at the mouth of the bottle blank molded by the molding structure of this part; and at the same time, the position for guiding the cooling water in and out can be flexibly set, so as to facilitate the control of the direction of the cooling water flowing through the inside of the die lip after installation.

Description

Technical Field

[0001] The utility model relates to the technical field of preform injection molds, in particular to a mold lip, a bottle preform mouth molding structure and a preform injection mold. Background Art

[0002] In the preform injection molding mold, the die lip is also called the neck ring, which is used to form the mouth of the preform. Usually, the mouth of the preform has radial structures such as support rings and threads. In order to demold the radial structure, the die lip is composed of two mirror-symmetrical half-die lips. When the two half-die lips are combined, they define the outer surface of the mouth of the preform; when the two half-die lips are separated, the mouth of the preform is freed from the axial constraint of the die lip, so that the preform can be demolded in the axial direction.

[0003] As the applicant has previously applied for and disclosed a Chinese utility model patent for a parallel double-layer water channel die lip cooling structure, the patent application number is CN210126242U, which specifically includes a left and right half of a mirror-symmetrical die lip body, a cooling water channel is arranged in the die lip body, a molding surface for bottle mouth molding is provided on one side of the die lip body, the cooling water channel is arranged on the periphery of the molding surface, and the cooling water channel is a double-layer structure.

[0004] like Figure 1 As shown, the first upper channel 22 is connected to the first lower channel 24 via the first parallel channel 23, and the second lower channel 25 is connected to the second upper channel 27 via the second parallel channel 26. In this structure, the cooling water cannot flow completely through the first upper channel 22, the first lower channel 24, the second lower channel 25 and the second upper channel 27, and there is a dead water area, which may result in insufficient cooling along the circumference of the forming surface.

[0005] In this structure, the cooling water first flows through the first upper channel 22, the first parallel channel 23 and the first lower channel 24, and then flows through the second lower channel 25, the second parallel channel 26 and the second upper channel 27. With this structure, the cooling water first flows along one side of the circumference and then flows along the other side of the circumference, which may result in uneven cooling along the circumference of the forming surface.

[0006] For example, the applicant has previously applied for and disclosed a Chinese utility model patent for a lip cooling structure of a preform mold, with patent application number CN214000195U. The structure specifically includes two half-lip components arranged in mirror symmetry, and the two half-lip components are assembled to form a lip body. The middle part of the lip body is provided with a hollow molding surface for forming the preform. A multi-level cooling water channel structure is axially arranged in the preform lip body, and the cooling water channel of the lip plate adopts a linear water channel structure, while the cooling water channel of the second hollow cylinder adopts an arcuate water channel structure.

[0007] like Figure 2 As shown, the arc-shaped water channel structure in the structure can enhance cooling for local areas, but due to the inconsistent water channel structures of the upper and lower water channels, the cooling along the axial direction of the forming surface may be uneven. Utility Model Content

[0008] In order to overcome the deficiencies of the prior art, the utility model provides a die lip, a bottle blank mouth forming structure and a blank injection mold.

[0009] The technical solution adopted by the utility model to solve its technical problems is:

[0010] A die lip comprises two separable half-die lip components whose at least non-molding structures are symmetrical about a parting plane, wherein cooling water channels are provided inside the half-die lip components for cooling the molding structures of the half-die lip components, wherein the cooling water channels comprise a first side water channel and a second side water channel which are at least partially located on both sides of a first plane, wherein the first plane is perpendicular to the parting plane and parallel to the die lip axis, wherein ends of the first side water channel and the second side water channel are connected to form a first connecting port and a second connecting port respectively, and the first connecting port and the second connecting port are connected to a first opening and a second opening of an upper end surface of the half-die lip components via the first water channel and the second water channel respectively.

[0011] In the utility model, the first plane passes through the die lip axis, and the first side water channel and the second side water channel are symmetrical about the first plane.

[0012] Furthermore, the cooling water channel also includes a first water trough and a second water trough located at both ends of the half-mold lip component, the first side water channel is connected to the first water trough, and the second side water channel is connected to the second water trough.

[0013] Furthermore, the first side water channel and the second side water channel are symmetrical about a second plane, and the second plane is perpendicular to the parting surface and passes through a center line of the first water trough and the second water trough.

[0014] In the present invention, the first opening and the second opening are respectively located on two sides of the first plane.

[0015] Further, the first mouth portion and the second mouth portion are symmetrical about the first plane.

[0016] In the utility model, the first side water channel includes two curved first channels and second channels, the first ends of the first channels and the second channels are connected, and the second ends of the first channels and the second channels respectively define a part of the first connecting port and a part of the second connecting port.

[0017] Furthermore, the first side water channel includes a curved third channel, the first channel, the second channel and the first ends of the third channel are connected, the second end of the third channel defines a portion of a third connecting port, and the third connecting port is located in the first water channel or the second water channel.

[0018] Based on the above-mentioned die lip, the utility model further provides a bottle blank mouth molding structure, including a mold core and a die lip as described above, wherein the die lip and the mold core are configured to limit the bottle blank mouth molding.

[0019] Based on the above-mentioned bottle blank mouth molding structure, the utility model also provides an injection mold, including a plurality of molding components for molding bottle blanks, and the molding components include the above-mentioned bottle blank mouth molding structure.

[0020] The utility model has the following advantages and beneficial effects: the cooling water channel inside the die lip is continuous and complete in the circumferential direction, and can provide uniform circumferential cooling for the molding structure of the die lip, avoiding poor cooling effect on the corresponding part of the molding structure due to the lack of cooling water channels at some positions on the circumference, thereby causing defects such as white mist and excessive crystallization at the mouth of the bottle blank formed by the molding structure of this part; at the same time, the position for guiding the cooling water in and out can be flexibly set, so as to facilitate the control of the direction of the cooling water flowing through the inside of the die lip after installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0022] Figure 1 It is a schematic diagram of the die lip cooling structure of the parallel double-layer water channel in the background technology;

[0023] Figure 2 It is a schematic diagram of the die lip cooling structure of the arc-shaped water channel structure in the background technology;

[0024] Figure 3 Schematic diagram of the half-mold lip component in this embodiment;

[0025] Figure 4 Schematic diagram of the cooling water channel in this embodiment;

[0026] Figure 5 is a schematic diagram of one connection of the third channel in this embodiment;

[0027] Figure 6 It is a front view of the cooling water channel in this embodiment and a schematic diagram of the first plane and the second plane;

[0028] Figure 7 This is a diagram of the installation structure of the die lip in this embodiment. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the embodiments of the utility model clearer, the technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model, but the utility model is not limited to the following embodiments.

[0030] like Figures 3 to 7 As shown, this embodiment discloses a die lip, comprising two separable half-die lip parts whose at least non-molding structures are symmetrical about a parting surface 6, the half-die lip parts comprising a half-die lip plate 1, a first half-hollow cylinder 2 and a second half-hollow cylinder 3 protruding from the upper and lower end surfaces of the half-die lip plate 1 respectively; a half-molding curved surface 4 for bottle blank molding is provided on the inner side of the half-die lip part, a cooling water channel 5 for cooling the half-molding curved surface 4 is provided inside the half-die lip part, the cooling water channel 5 comprises a first side water channel 51 and a second side water channel 52 at least partially located on both sides of a first plane 8, the first side water channel 51 and the second side water channel 52 are composed of a curved channel surrounding the half-molding curved surface 4 in the half-die lip part, rather than two broken lines. The structure can be obtained by 3D printing; the first plane 8 is perpendicular to the parting surface 6 and parallel to the die lip axis 7, the die lip axis 7 is the axis of the molding structure formed by splicing two die lips, the ends of the first side water channel 51 and the second side water channel 52 are respectively connected to form a first connecting port 53 and a second connecting port 54, the first connecting port 53 and the second connecting port 54 can be located on the first plane 8 or on both sides of the first plane 8 respectively, and the first connecting port 53 is located above the second connecting port 54, the first connecting port 53 and the second connecting port 54 are respectively connected with the first opening 57 and the second opening 58 of the upper end surface of the half-die lip component through the first water channel 55 and the second water channel 56.

[0031] In this embodiment, the first plane 8 passes through the die lip axis 7 , and the first side water channel 51 and the second side water channel 52 are symmetrical about the first plane 8 .

[0032] Furthermore, the cooling water channel 5 also includes a first water trough 110 and a second water trough 120 located at both ends of the half-mold lip component. Specifically, the first water trough 110 is arranged at the right end surface of the half-mold lip plate 1, and the second water trough 120 is arranged at the left end surface of the half-mold lip plate 1. The first side water channel 51 is connected to the first water trough 110, and the second side water channel 52 is connected to the second water trough 120.

[0033] Specifically, a half-mold lip component having a first side water channel 51, a second side water channel 52, a first water channel 55 and a second water channel 56 is processed through 3D printing technology, a first process hole 11 is processed inwardly on one side end surface of the half-mold lip component, and the first water trough 110 is processed inwardly from the first process hole 11, so that the first water trough 110 is connected to the first side water channel 51; a second process hole 12 is processed inwardly on the other side end surface of the half-mold lip component, and the second water trough 120 is processed inwardly from the second process hole 12, so that the second water trough 120 is connected to the second side water channel 52; after processing, the first process hole 11 and the second process hole 12 are sealed with a plug.

[0034] In this embodiment, the first side water channel 51 includes two curved first channels 511 and second channels 512, the first ends of the first channels 511 and the second channels 512 are connected through the first water tank 110, and the second ends of the first channels 511 and the second channels 512 respectively define a portion of the first connecting port 53 and a portion of the second connecting port 54.

[0035] Furthermore, the first side water channel 51 also includes a curved third channel 513, and the first ends of the first channel 511, the second channel 512 and the third channel 513 are connected through the first water tank 110. The second end of the third channel 513 defines a portion of a third connecting port 59, and the third connecting port 59 is located in the first water channel 55 or the second water channel 56.

[0036] In this embodiment, the second side water channel 52 includes two curved fourth channels 521 and fifth channels 522, the first ends of the fourth channels 521 and the fifth channels 522 are connected through the second water tank 120, and the second ends of the fourth channels 521 and the fifth channels 522 respectively define a portion of the first connecting port 53 and a portion of the second connecting port 54.

[0037] Furthermore, the second side water channel 52 also includes a curved sixth channel 523, the first ends of the fourth channel 521, the fifth channel 522 and the sixth channel 523 are connected through the second water tank 120, and the second end of the sixth channel 523 defines a portion of the third connecting port 59, and the third connecting port 59 is located in the first water channel 55 or the second water channel 56.

[0038] In this embodiment, the first side water channel 51 and the second side water channel 52 are symmetrical about the second plane 9 , and the second plane 9 is perpendicular to the parting surface 6 and passes through the center line of the first water tank 110 and the second water tank 120 .

[0039] In this embodiment, the first opening 57 and the second opening 58 are respectively located on two sides of the first plane 8 and are symmetrical with respect to the first plane 8 .

[0040] Based on the die lip provided above, this embodiment further provides a bottle blank mouth molding structure, including a mold core and a die lip as described above, wherein the die lip and the mold core are configured to limit the bottle blank mouth molding;

[0041] The die lip is fixedly mounted on a slide plate 502, and the slide plate 502 is configured to be fixedly mounted on a corresponding sliding bar 501. A water inlet hole and a water outlet hole 503 on the slide plate 502 are selectively connected to a first opening and a second opening on the die lip, and a sealing ring is arranged around the connecting part; the cooling water enters and exits the die lip cooling water channel in sequence through the joint 500, the sliding bar 501, and the slide plate 502.

[0042] Based on the above-mentioned bottle blank mouth molding structure, this embodiment further provides an injection mold, including a plurality of molding components for molding bottle blanks, and the molding components include the above-mentioned bottle blank mouth molding structure.

[0043] The above contents described in this specification are merely examples of the present invention. Technicians in the technical field to which the present invention belongs can make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the contents of the present invention specification or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

Claims

1. A die lip, comprising two separable half-die lip parts, at least the non-forming structure of which is symmetrical about the parting plane, wherein the half-die lip parts are provided with cooling water channels for cooling the forming structure of the half-die lip parts, characterized in that: The cooling water channel includes a first side water channel and a second side water channel at least partially located on both sides of a first plane, the first plane is perpendicular to the parting surface and parallel to the axis of the mold lip, the ends of the first side water channel and the second side water channel are respectively connected to form a first connecting port and a second connecting port, the first connecting port and the second connecting port are respectively connected to the first port and the second port of the upper end surface of the half mold lip component through the first water channel and the second water channel.

2. A die lip according to claim 1, characterized in that: The first plane passes through the die lip axis, and the first side channel and the second side channel are symmetrical about the first plane.

3. A die lip according to claim 2, characterized in that: The cooling water channel also includes a first water trough and a second water trough located at both ends of the half-mold lip component, the first side water channel is connected to the first water trough, and the second side water channel is connected to the second water trough.

4. A die lip according to claim 3, characterized in that: The first side water channel and the second side water channel are both symmetrical about a second plane, and the second plane is perpendicular to the parting surface and passes through a center line of the first water trough and the second water trough.

5. A die lip according to claim 1, characterized in that: The first opening and the second opening are respectively located on two sides of the first plane.

6. A die lip according to claim 5, characterized in that: The first mouth portion and the second mouth portion are symmetrical with respect to the first plane.

7. A die lip according to any one of claims 1 to 6, characterized in that: The first side water channel includes two curved first channels and second channels, the first ends of the first channels and the second channels are connected, and the second ends of the first channels and the second channels respectively define a part of the first communication port and a part of the second communication port.

8. A die lip according to claim 7, characterized in that: The first side water channel includes a curved third channel, the first channel, the second channel and the first end of the third channel are connected, the second end of the third channel defines a portion of a third communication port, and the third communication port is located in the first water channel or the second water channel.

9. A bottle blank mouth forming structure, characterized in that: The invention comprises a mold core and a mold lip as claimed in any one of claims 1 to 8, wherein the mold lip and the mold core are configured to define the molding of the mouth of the bottle blank.

10. An injection mold, comprising a plurality of molding components for molding preforms, characterized in that: The molding assembly includes the bottle blank mouth molding structure according to claim 9.

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