PET (Polyethylene Terephthalate) bottle preform injection mold with hot runner sprue heat insulation mechanism

Abstract

The utility model belongs to the technical field of molds, and relates to a PET (Polyethylene Terephthalate) bottle preform injection mold with a hot runner sprue heat insulation mechanism. The bottle blank fixing device comprises a bottle blank fixing lower die and a bottle blank fixing upper die. In the injection molding process, the bottle blank fixing lower mold and the bottle blank fixing upper mold are close to each other, so that the bottle blank forming inner barrel, the bottle blank forming sleeve and the bottle blank bottom forming piece are matched to form a cavity, and a molten material is subjected to injection molding and flow dividing through the injection molding flow dividing piece, divided into six parts and injected into the six anti-blocking pouring structures; the anti-blocking pouring structure is used for carrying out pressurized injection molding on the shunted molten material, the flow speed of the shunted molten material is prevented from being reduced, it is ensured that the molten material can be rapidly poured into a cavity, the blocking situation is reduced, the molding efficiency is improved, and the horizontally-moving type supporting and loosening piece can prevent a molding piece at the bottom of a bottle preform from sliding up and down in the injection molding process; and the stability of the cavity is higher.

Description

Technical Field

[0001] The utility model belongs to the technical field of molds and relates to a PET bottle preform injection mold with a hot runner gate insulation mechanism. Background Art

[0002] The surface of PET plastic bottles is smooth and shiny. It has good creep resistance, fatigue resistance, friction resistance and dimensional stability, low wear and high hardness, and has the greatest toughness among thermoplastics. When producing PET plastic bottles, a mold is usually used to injection mold the PET plastic bottle embryo before processing. In the production process, the existing PET bottle embryo injection mold generally adopts a one-mold multi-cavity structure to mold multiple bottle embryo plastic parts at a time. Therefore, it is necessary to use a diversion structure to divert the molten material. Once there are too many cavities and the diversion stroke is long, the flow rate of the molten material will be reduced, making it difficult to ensure that the molten material is quickly poured into the cavity, and it is easy to get clogged, affecting the molding efficiency. Therefore, there is an urgent need to design a PET bottle embryo injection mold with a hot runner gate insulation mechanism that can overcome the above defects.

[0003] In order to overcome the shortcomings of the existing technology, people have proposed various solutions through continuous exploration. For example, a Chinese patent discloses a high-speed group-cavity PET bottle preform injection mold [application number: 202320151513.7], which includes a mold body, a base, a motor, a rotating block, an upper mold box, a processing plate and a forming mold. The output end of the motor extends into the interior of the mold body and is fixedly connected to the rotating block. Processing plates are installed on both sides of the outer wall of the rotating block. Multiple forming molds are arranged inside the two processing plates. Hydraulic cylinders are fixedly installed on the lower end surfaces of the two processing plates. The output ends of the two hydraulic cylinders extend into the corresponding processing plates and are fixedly connected to long plates. Multiple ejector plates are fixedly installed on both side walls of the long plates, and one end of the multiple ejector plates is fixedly connected to the bottle mouth mold. Utility Model Content

[0004] The purpose of the utility model is to solve the above problems and provide a PET bottle preform injection mold with a hot runner gate insulation mechanism.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A PET preform injection mold with a hot runner gate insulation mechanism includes a preform fixed lower mold and a preform fixed upper mold, a preform molding inner cylinder, a preform molding sleeve and a preform bottom molding piece are arranged between the preform fixed lower mold and the preform fixed upper mold, the preform molding inner cylinder passes through the preform bottom molding piece and the top of the preform molding inner cylinder extends into the preform molding sleeve, the preform molding sleeve has an anti-blocking pouring structure, an injection diverter is provided above the preform fixed upper mold, the injection diverter is connected to the anti-blocking pouring structure, and a translational support and relaxation piece is provided between the preform bottom molding piece and the preform fixed lower mold.

[0007] In the above-mentioned PET preform injection mold with a hot runner gate insulation mechanism, the anti-blocking pouring structure includes a main inlet gate and a pressurized pouring channel arranged in the preform molding sleeve, and the diameter of the pressurized pouring channel is smaller than the diameter of the main inlet gate.

[0008] In the above-mentioned PET preform injection mold with a hot runner gate insulation mechanism, the diameter of the main inlet gate gradually decreases from top to bottom.

[0009] In the above-mentioned PET preform injection mold with a hot runner gate insulation mechanism, the injection diverter includes an injection main board and an injection diverter plate arranged on the preform fixed upper mold, and the injection diverter plate is connected to the main inlet gate.

[0010] In the above-mentioned PET preform injection mold with a hot runner gate insulation mechanism, the injection main board has a first-level pressurizing portion, and the first-level pressurizing portion is connected to the injection manifold.

[0011] In the above-mentioned PET preform injection mold with a hot runner gate insulation mechanism, the first-level pressurizing part includes a large-flow injection pressurizing main hole arranged in the injection main board, and the diameter of the large-flow injection pressurizing main hole gradually decreases from top to bottom.

[0012] In the above-mentioned PET preform injection mold with a hot runner gate insulation mechanism, a molding cavity is provided in the preform molding sleeve, and the molding cavity is communicated with a pressurized pouring channel.

[0013] In the above-mentioned PET preform injection mold with a hot runner gate insulation mechanism, the preform bottom molding part includes two preform bottom molding clamps arranged below the preform molding sleeve, a sealing sleeve is provided below the preform bottom molding clamps, and the inner side of the preform bottom molding clamps has a receiving step body that abuts against the sealing sleeve.

[0014] In the above-mentioned PET bottle blank injection mold with a hot runner gate insulation mechanism, the translational support and relaxation member includes a support frame plate arranged below the bottle blank bottom molding clamp, and the bottom of the bottle blank bottom molding clamp has a snap ring portion, and the snap ring portion is snap-fitted with the support frame plate.

[0015] In the above-mentioned PET preform injection mold with a hot runner gate insulation mechanism, a receiving ring is provided on the outer side of the sealing sleeve, and the receiving ring is engaged with the bottom groove of the support frame plate.

[0016] Compared with the existing technology, the advantages of this utility model are:

[0017] 1. During the injection molding process, the present invention brings the preform fixing lower mold and the preform fixing upper mold close to each other, so that the preform molding inner cylinder, the preform molding sleeve and the preform bottom molding part cooperate to form a cavity. The molten material is injection-diverted by the injection diverter, and the molten material is diverted into six parts and injected into six anti-clogging pouring structures. The diverted molten material is pressurized and injected through the anti-clogging pouring structure to avoid a reduction in the flow rate of the diverted molten material, ensuring that the molten material can be quickly poured into the cavity, reducing the occurrence of blockage and improving molding efficiency. The translational support and relaxation part can prevent the bottom molding part of the preform from sliding up and down during injection molding, and the stability of the cavity is relatively high.

[0018] 2. The large-flow injection molding pressurization main hole in the utility model can form a preliminary pressurization between the injection molding main board and the injection molding machine. The diameter of the large-flow injection molding pressurization main hole gradually decreases from top to bottom, which has a better pressurization effect and avoids the influence of too low flow rate on the diversion effect.

[0019] Other advantages, objectives and features of the present invention will be reflected in part through the following description, and in part will be understood by those skilled in the art through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural diagram of the present utility model.

[0021] Figure 2 It is a top view of the present utility model.

[0022] Figure 3 yes Figure 2 Schematic diagram of the cross section at AA in the middle.

[0023] Figure 4 It is a partial structural diagram of the utility model.

[0024] Figure 5 It is a structural diagram of a preform forming sleeve.

[0025] In the figure: the preform fixing lower mold 1, the preform fixing upper mold 2, the preform molding inner cylinder 3, the preform molding sleeve 4, the preform bottom molding part 5, the anti-clogging pouring structure 6, the injection molding diverter part 7, the translational support and relaxation part 8, the main inlet gate 9, the pressurized pouring channel 10, the injection molding main board 11, the injection molding diverter plate 12, the first-level pressurizing part 13, the large-flow injection molding pressurizing main hole 14, the molding cavity part 15, the preform bottom molding splint 16, the sealing sleeve 17, the receiving step body 18, the support frame plate 19, the clamping ring part 20, and the receiving ring 21. DETAILED DESCRIPTION

[0026] The present invention will be further described below with reference to the accompanying drawings.

[0027] like Figure 1-5 As shown, a PET bottle preform injection mold with a hot runner gate insulation mechanism includes a bottle preform fixed lower mold 1 and a bottle preform fixed upper mold 2, a bottle preform molding inner cylinder 3, a bottle preform molding sleeve 4 and a bottle preform bottom molding part 5 are arranged between the bottle preform fixed lower mold 1 and the bottle preform fixed upper mold 2, the bottle preform molding inner cylinder 3 passes through the bottle preform bottom molding part 5 and the top of the bottle preform molding inner cylinder 3 extends into the bottle preform molding sleeve 4, the bottle preform molding sleeve 4 has an anti-blocking pouring structure 6, an injection diverter 7 is provided above the bottle preform fixed upper mold 2, the injection diverter 7 is connected to the anti-blocking pouring structure 6, and a translational support and relaxation part 8 is provided between the bottle preform bottom molding part 5 and the bottle preform fixed lower mold 1.

[0028] In this embodiment, during the injection molding process, the preform fixing lower mold 1 and the preform fixing upper mold 2 are brought close to each other, so that the preform molding inner cylinder 3, the preform molding sleeve 4 and the preform bottom molding part 5 cooperate to form a cavity, and the molten material is injection-diverted through the injection molding diverter 7, and the molten material is diverted into six parts and injected into six anti-clogging pouring structures 6. The diverted molten material is pressurized and injection-molded by the anti-clogging pouring structure 6 to avoid a decrease in the flow rate of the diverted molten material, ensuring that the molten material can be quickly poured into the cavity, reducing the occurrence of blockage, and improving molding efficiency. The translational support and relaxation part 8 can prevent the bottom molding part 5 of the preform from sliding up and down during injection molding, and the stability of the cavity is relatively high.

[0029] Combine Figure 1-5 As shown, the anti-clogging pouring structure 6 includes a main pouring gate 9 and a pressurized pouring channel 10 arranged in the bottle blank molding sleeve 4. The diameter of the pressurized pouring channel 10 is smaller than the diameter of the main pouring gate 9, and the diameter of the main pouring gate 9 gradually decreases from top to bottom.

[0030] In this embodiment, the molten material is injection-diverted through the injection diverter 7, and the molten material is diverted into six parts and injected into the main inlet gate 9. The diameter of the main inlet gate 9 gradually decreases from top to bottom, forming a large-flow injection molding, and then pressurized through the pressurized pouring channel 10. The diameter of the pressurized pouring channel 10 is smaller than the diameter of the main inlet gate 9, ensuring the pressurization effect, avoiding the reduction of the flow rate of the molten material after diversion, ensuring that the molten material can be quickly poured into the cavity, reducing the occurrence of blockage, and improving the molding efficiency.

[0031] Combine Figure 3-5 As shown, the injection molding diverter 7 includes an injection molding main board 11 and an injection molding diverter plate 12 arranged on the bottle blank fixed upper mold 2, the injection molding diverter plate 12 is connected to the main inlet gate 9, and the injection molding main board 11 has a first-level pressurizing part 13, and the first-level pressurizing part 13 is connected to the injection molding diverter plate 12.

[0032] In this embodiment, the molten material is injected into the injection molding diverter plate 12 through the first-level pressurizing portion 13 of the injection molding main board 11 for diversion. The first-level pressurizing portion 13 can form preliminary pressurization between the injection molding main board 11 and the injection molding machine to avoid the flow rate being too low to affect the diversion effect.

[0033] Combine Figure 3-5 As shown, the first-level pressurizing part 13 includes a large-flow injection pressurizing main hole 14 provided in the injection main board 11 , and the diameter of the large-flow injection pressurizing main hole 14 gradually decreases from top to bottom.

[0034] In this embodiment, the large-flow injection molding pressurization main hole 14 can form preliminary pressurization between the injection molding main board 11 and the injection molding machine. The diameter of the large-flow injection molding pressurization main hole 14 gradually decreases from top to bottom, and the pressurization effect is better, avoiding the influence of too low flow rate on the diversion effect.

[0035] The preform forming sleeve 4 has a forming cavity 15 therein, and the forming cavity 15 is connected to the pressurized pouring channel 10 .

[0036] In this embodiment, the molding cavity 15 is used to assist in molding the preform.

[0037] Combine Figure 1-5 As shown, the preform bottom forming part 5 includes two preform bottom forming clamps 16 arranged below the preform forming sleeve 4, a sealing sleeve 17 is provided below the preform bottom forming clamps 16, and a receiving step body 18 is provided on the inner side of the preform bottom forming clamps 16 to abut against the sealing sleeve 17.

[0038] In this embodiment, the two bottle bottom forming clamps 16 are used to assist in forming the bottom structure of the plastic part, the sealing sleeve 17 plays a sealing role to prevent the molten material from leaking, and the receiving step body 18 prevents the bottle bottom forming clamps 16 from sliding off the outside of the sealing sleeve 17.

[0039] Combine Figure 1-5 As shown, the translational support and relaxation member 8 includes a support frame plate 19 arranged below the bottle bottom forming clamp 16, and the bottom of the bottle bottom forming clamp 16 has a snap ring portion 20, and the snap ring portion 20 is snap-fitted with the support frame plate 19.

[0040] In this embodiment, the support frame plate 19 plays a supporting and fixing role, and the snap ring portion 20 is snap-fitted with the support frame plate 19 to prevent shaking at the connection.

[0041] Combine Figure 1-5 As shown, a receiving ring 21 is provided on the outer side of the sealing sleeve 17 , and the receiving ring 21 is engaged with the bottom groove of the support frame plate 19 .

[0042] In this embodiment, the receiving ring 21 is engaged with the bottom groove of the support frame plate 19 to prevent shaking at the connection.

[0043] The working principle of this utility model is:

[0044] During the injection molding process, the bottle blank fixing lower mold 1 and the bottle blank fixing upper mold 2 are brought close to each other, so that the bottle blank molding inner cylinder 3, the bottle blank molding sleeve 4 and the bottle blank bottom molding part 5 cooperate to form a cavity, and the molten material is injected into the injection molding diverter plate 12 through the large-flow injection molding pressurization main hole 1 of the injection molding main board 11 for diversion. The large-flow injection molding pressurization main hole 1 can form a preliminary pressurization between the injection molding main board 11 and the injection molding machine to avoid the flow rate being too low to affect the diversion effect, and the molten material is diverted into six parts and injected into the main inlet gate 9. The diameter of the main inlet gate 9 gradually decreases from top to bottom to form a large-flow injection molding, and then pressurized through the pressurized pouring channel 10. The diameter of the pressurized pouring channel 10 is smaller than the diameter of the main inlet gate 9 to ensure the pressurization effect, avoid the flow rate of the molten material after diversion to decrease, ensure that the molten material can be quickly poured into the cavity, reduce the occurrence of blockage, and improve molding efficiency.

[0045] The molding cavity 15 is used to assist in molding the bottle blank, the two bottle blank bottom molding clamps 16 are used to assist in molding the bottom structure of the plastic part, the sealing sleeve 17 plays a sealing role to prevent the molten material from leaking, and the receiving step 18 plays a role in preventing the bottle blank bottom molding clamps 16 from sliding off the outside of the sealing sleeve 17.

[0046] The support frame plate 19 plays a supporting and fixing role. The snap ring portion 20 is snap-fitted with the support frame plate 19, and the receiving ring 21 is snap-fitted with the bottom groove of the support frame plate 19 to avoid shaking at the connection.

[0047] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described, or replace them with similar methods, without departing from the spirit of the present invention.

[0048] Although the present invention frequently uses terms such as the preform fixing lower mold 1, the preform fixing upper mold 2, the preform molding inner cylinder 3, the preform molding sleeve 4, the preform bottom molding member 5, the anti-clogging pouring structure 6, the injection molding diverter 7, the translational support and relaxation member 8, the main pouring gate 9, the pressurized pouring channel 10, the injection molding main plate 11, the injection molding diverter plate 12, the primary pressurizing portion 13, the high-flow injection pressurizing main hole 14, the molding cavity 15, the preform bottom molding clamping plate 16, the sealing sleeve 17, the receiving step 18, the support frame plate 19, the clamping ring portion 20, and the receiving ring 21, the use of other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of the present invention. Interpreting them as any additional limitation is contrary to the spirit of the present invention.

Claims

1. A PET preform injection mold with a hot runner gate insulation mechanism, comprising a preform fixed lower mold (1) and a preform fixed upper mold (2), characterized in that: A preform molding inner cylinder (3), a preform molding sleeve (4) and a preform bottom molding piece (5) are provided between the preform fixed lower mold (1) and the preform fixed upper mold (2); the preform molding inner cylinder (3) passes through the preform bottom molding piece (5) and the top of the preform molding inner cylinder (3) extends into the preform molding sleeve (4); an anti-blocking pouring structure (6) is provided in the preform molding sleeve (4); an injection molding diverter (7) is provided above the preform fixed upper mold (2); the injection molding diverter (7) is connected to the anti-blocking pouring structure (6); and a translational support and relaxation piece (8) is provided between the preform bottom molding piece (5) and the preform fixed lower mold (1).

2. The PET preform injection mold with a hot runner gate insulation mechanism according to claim 1, characterized in that: The anti-blocking pouring structure (6) comprises a main pouring gate (9) and a pressurized pouring channel (10) arranged in the bottle blank forming sleeve (4), and the diameter of the pressurized pouring channel (10) is smaller than the diameter of the main pouring gate (9).

3. The PET preform injection mold with a hot runner gate insulation mechanism according to claim 2, characterized in that: The diameter of the main inlet gate (9) gradually decreases from top to bottom.

4. The PET preform injection mold with a hot runner gate insulation mechanism according to claim 3, characterized in that: The injection molding diverter (7) comprises an injection molding main plate (11) and an injection molding diverter plate (12) arranged on the bottle blank fixed upper mold (2); the injection molding diverter plate (12) is connected to the main inlet gate (9).

5. The PET preform injection mold with a hot runner gate insulation mechanism according to claim 4, characterized in that: The injection molding main board (11) has a first-level pressurizing portion (13) therein, and the first-level pressurizing portion (13) is connected to the injection molding diverter plate (12).

6. The PET preform injection mold with a hot runner gate insulation mechanism according to claim 5, characterized in that: The first-level pressurizing portion (13) comprises a large-flow injection pressurizing main hole (14) arranged in the injection main board (11), and the diameter of the large-flow injection pressurizing main hole (14) gradually decreases from top to bottom.

7. The PET preform injection mold with a hot runner gate insulation mechanism according to claim 6, characterized in that: The preform forming sleeve (4) has a forming cavity (15) therein, and the forming cavity (15) is connected to the pressurized pouring channel (10).

8. The PET preform injection mold with a hot runner gate insulation mechanism according to claim 7, characterized in that: The preform bottom forming part (5) comprises two preform bottom forming clamps (16) arranged below the preform forming sleeve (4), a sealing sleeve (17) is provided below the preform bottom forming clamps (16), and a receiving step body (18) is provided on the inner side of the preform bottom forming clamps (16) and is in contact with the sealing sleeve (17).

9. The PET preform injection mold with a hot runner gate insulation mechanism according to claim 8, characterized in that: The translational support and relaxation member (8) comprises a support frame plate (19) arranged below the bottle blank bottom forming clamp (16), the bottom of the bottle blank bottom forming clamp (16) has a snap ring portion (20), and the snap ring portion (20) is snap-fitted with the support frame plate (19).

10. The PET preform injection mold with a hot runner gate insulation mechanism according to claim 9, characterized in that: The outer side of the sealing sleeve (17) is provided with a receiving ring (21), and the receiving ring (21) is clamped with the bottom groove of the support frame plate (19).

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