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CN-224210520-U - Blow molding die and blow pin

CN224210520UCN 224210520 UCN224210520 UCN 224210520UCN-224210520-U

Abstract

The utility model discloses a blow molding die and a blow pin, wherein a storage cavity is arranged on the blow molding die for storing extra plastic blanks, and the plastic blanks in the storage cavities are scraped in the moving process by matching with the blow pin and are accurately guided to a bottle opening forming area, so that sufficient material supply at the bottle opening is ensured, and the integrity and the wall thickness uniformity of bottle opening forming are obviously improved. The utility model can be easily integrated into the existing production line by only adding the storage cavity and the port structure thereof in the mould without greatly modifying the existing blow molding equipment, has the characteristics of low implementation cost and strong compatibility, and simultaneously enhances the sealing performance and the service life of the product, obviously reduces the production rejection rate and improves the overall production efficiency and economic benefit due to the improvement of the molding quality of the bottle mouth.

Inventors

  • SHI WEISHENG
  • Xue Xingshen

Assignees

  • 利宾来塑胶工业（深圳）有限公司

Dates

Publication Date
20260508
Application Date
20250506

Claims (10)

  1. 1. The utility model provides a blowing mould, includes mould and lower mould, go up mould and lower mould cooperation and form the die cavity, be equipped with the bottleneck between mould and the lower mould, bottleneck and die cavity intercommunication, its characterized in that: one side of the bottleneck, which is far away from the cavity, is provided with a storage cavity, and the storage cavity is used for storing plastic blanks in the blow molding process and supplementing the plastic blanks in the storage cavity to a molding area of the bottleneck through movement of a blow pin.
  2. 2. A blow mold according to claim 1, wherein the blow mold comprises a mold cavity, The storage cavity is provided with a first port and a second port; The first port is arranged on one side of the storage cavity facing the blowing needle inlet and is used for the blowing needle to enter the storage cavity; the second port is arranged at the joint of the storage cavity and the bottle mouth and is used for communicating the storage cavity with the bottle mouth; The blowing needle enters the storage cavity through the first port, scrapes plastic blanks in the storage cavity in the moving process, and supplements the plastic blanks to the forming area of the bottle opening through the second port.
  3. 3. The blow mold of claim 2 wherein the storage cavity is a cylindrical structure, the cross-sectional area of the storage cavity being less than the cross-sectional area of the finish.
  4. 4. A blow mold according to claim 3, wherein the inner wall surface of the storage cavity has a guiding layer for guiding the plastic preform to flow along a predetermined path toward the molding area of the bottle mouth.
  5. 5. The blow mold according to claim 4, wherein the guide layer is a polytetrafluoroethylene material layer having a surface roughness of Ra0.1-0.5 μm.
  6. 6. A blow mold according to claim 3 wherein the first and second ports are each of circular configuration coaxial with the storage cavity and the first and second ports have the same diameter.
  7. 7. A blow mold according to claim 6, wherein the blow mold comprises a mold cavity, The diameters of the first port and the second port are 50% -70% of the diameter of the storage cavity.
  8. 8. A blow mold according to claim 3, wherein the blow mold comprises a mold cavity, The inner diameter of the storage cavity is gradually reduced from the first port to the second port along the axial direction, so that a conical structure is formed.
  9. 9. A blowing needle adapted for use in a blow mould according to any one of claims 1 to 8, the outer surface of the blowing needle being provided with micro-texture structures (61) for enhancing adhesion to the plastic embryo when passing through the storage cavity so as to uniformly bring the plastic embryo in the storage cavity into the moulding region of the mouth of the bottle.
  10. 10. A blowing needle according to claim 9, wherein the micro-texture comprises helical grooves distributed axially along the blowing needle, the depth of the helical grooves being 0.01-0.1mm, the pitch of the helical grooves being 0.5-2mm.

Description

Blow molding die and blow pin Technical Field The utility model relates to plastic container manufacturing equipment, in particular to a blow mould and a blow needle. Background Blow molding is a common plastic container manufacturing process and is widely applied to the fields of beverage bottles, cosmetic bottles, medicine packages and the like. In the conventional blow molding process, a plastic blank is formed into an initial blank tube by extrusion or injection molding, and then is placed into a mold cavity, compressed air is injected into the blank tube through a blowing needle, so that the blank tube is expanded and attached to the inner wall of a mold cavity, and finally a required plastic container is formed. The process has the advantages of high production efficiency, low cost, wide application range and the like, and becomes the main stream process in the plastic container manufacturing industry. However, in the actual production process, due to factors such as uneven distribution of the blanks, unstable temperature control and the like, the problem of insufficient plastic blanks at the bottle mouth often occurs in the traditional blow molding process, and the defects such as incomplete bottle mouth molding, uneven wall thickness or tiny cracks occur in the bottle mouth. Particularly, when manufacturing a thin-wall container or a product with a complex shape, the problem of bottle opening molding quality is more remarkable, the sealing performance and the service life of the product are affected, the production rejection rate is increased, and the production efficiency is reduced. In the prior art, a blow molding mold structural design capable of effectively solving the problem of molding a bottle opening is not available. Disclosure of utility model In order to overcome the defects in the prior art, the utility model provides a blow molding die and a blow pin for solving the defect of molding quality caused by insufficient plastic blanks at a bottle opening in the blow molding process. The technical scheme adopted for solving the technical problems is as follows: A blow molding die comprises an upper die and a lower die, wherein the upper die and the lower die are matched to form a cavity, a bottle opening is arranged between the upper die and the lower die and communicated with the cavity, a storage cavity is arranged on one side, away from the cavity, of the bottle opening, and is used for storing plastic blanks in the blow molding process, and the plastic blanks in the storage cavity are supplemented to a molding area of the bottle opening through movement of a blowing needle. Further, the storage cavity is provided with a first port and a second port; the first port is arranged at one side of the storage cavity facing the blowing needle inlet and used for enabling the blowing needle to enter the storage cavity, the second port is arranged at the joint of the storage cavity and the bottle opening and used for communicating the storage cavity with the bottle opening, the blowing needle enters the storage cavity through the first port and scrapes plastic blanks in the storage cavity in the moving process, and then the plastic blanks are supplemented to a forming area of the bottle opening through the second port. Further, the storage cavity is of a columnar structure, and the cross section area of the storage cavity is smaller than that of the bottle opening. Further, the inner wall surface of the storage cavity is provided with a guide layer for guiding the plastic embryo to flow to the forming area of the bottle mouth along a preset path. Further, the guiding layer is a polytetrafluoroethylene material layer, and the surface roughness of the guiding layer is Ra0.1-0.5 mu m. Further, the first port and the second port are both in a circular structure coaxial with the storage cavity, and the diameters of the first port and the second port are the same. Further, the diameters of the first port and the second port are 50% -70% of the diameter of the storage cavity. Further, the inner diameter of the storage cavity is gradually reduced from the first port to the second port along the axial direction, so that a conical structure is formed. The blowing needle is suitable for the blowing mould, and the outer surface of the blowing needle is provided with a micro-texture structure for enhancing the adhesiveness with a plastic embryo when passing through the storage cavity so as to uniformly bring the plastic embryo in the storage cavity into the forming area of the bottle mouth. Further, the micro-texture structure comprises spiral grooves distributed along the axial direction of the blowing needle, the depth of each spiral groove is 0.01-0.1mm, and the pitch of each spiral groove is 0.5-2mm. The beneficial effects of the utility model are as follows: According to the blow molding die, the storage cavities are arranged for storing additional plastic blanks, and the blowing needles can scrape the plas