Bottle blank structure convenient to form and demould
The bottle preform design with a tapered connection section and support ring allows for easy demolding by preventing breakage, enhancing the efficiency of the demolding process.
Patent Information
- Application Number
- CN202422411563.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-08
- Publication Date
- 2025-07-15
- Estimated Expiration
- 2034-10-08
AI Technical Summary
The existing bottle preforms are arranged inclined at the bottleneck, which leads to inconvenience in mold release and makes it difficult to efficiently detach the die core.
A bottle preform structure is designed, in which the diameter of the connecting part gradually decreases from top to bottom, and a support ring and a snap ring are provided at the bottle mouth to facilitate mold release, and the step structure of the support ring and the snap ring is combined to improve sealing.
It realizes smooth separation between the die core and the bottle preform, facilitates mold release, and enhances the sealing effect and prevents external material contamination.
Smart Images
Figure CN223101267U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of plastic bottles and relates to a preform structure that is convenient for forming and demolding. Background Art
[0002] A preform is formed by injecting plastic raw materials into a mold cavity at a specific temperature and pressure under the working conditions of an injection molding machine. After injection molding, a semi-finished product called a preform is obtained, and then the preform is placed in a blow molding machine, heated and blown, and finally cooled and shaped to form a plastic bottle. However, the existing preforms are inclined outward at the bottleneck, that is, the upper diameter is smaller than the lower diameter, resulting in inconvenient demolding of the preform from the mold core. Summary of the Utility Model
[0003] The purpose of the present utility model is to address the above problems existing in the prior art and propose a preform structure that is convenient for forming and demolding. The diameter of the connecting part gradually decreases from top to bottom, so the separation between the mold core and the preform is relatively smooth, facilitating demolding.
[0004] The purpose of the present utility model can be achieved by the following technical solutions: A preform structure that is convenient for forming and demolding, including a bottle mouth part, a connecting part, a bottle body part, and a bottle bottom part. An external thread for connecting with a bottle cap is provided on the bottle mouth part. It is characterized in that the connecting part connects the bottle mouth part and the bottle body part. A snap ring is provided at the connection between the connecting part and the bottle mouth part. The bottle body part is in a straight cylindrical shape. A support ring for abutting against the lower end of the bottle cap is also provided on the bottle mouth part. The support ring is located between the external thread and the snap ring. The connecting part is frustum-shaped and its diameter gradually decreases from top to bottom. The bottle bottom part is inclined inward and has a spherical surface that is concave upward at its center.
[0005] Further, the distance between the support ring and the snap ring is 3.5 mm to 7 mm.
[0006] Further, the cross-section of the support ring is an isosceles trapezoid.
[0007] Further, steps are provided on the support ring that can abut against both the inner side surface and the lower end surface of the bottle cap. The vertical surface and the horizontal surface of the steps are in close contact with the bottle cap, which can improve the sealing effect and prevent external substances from entering and polluting the inside of the bottle.
[0008] Further, the cross-section of the snap ring is a right trapezoid.
[0009] Further, the wall thicknesses of the bottle body part and the bottle bottom part are the same, and the wall thickness of the connecting part gradually increases from top to bottom.
[0010] Compared with the prior art, the preform structure that is convenient for forming and demolding of the present utility model has the following advantages:
[0011] 1. The wall thickness of the connecting part is relatively large and will not break even when it is bent outward and stretched downward during the blow molding process.
[0012] 2. Since the diameter of the connecting part gradually decreases from top to bottom, the separation between the core and the preform is relatively smooth, facilitating demolding. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 is a schematic cross-sectional structure diagram of the preform structure for convenient forming and demolding.
[0014] In the figure, 1 is the bottle mouth part; 11 is the external thread; 2 is the connecting part; 3 is the bottle body part; 4 is the bottle bottom part; 41 is the spherical surface; 5 is the support ring; 51 is the step; 6 is the snap ring. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0015] The following are specific embodiments of the present invention and in combination with the accompanying drawings, the technical solutions of the present invention will be further described, but the present invention is not limited to these embodiments.
[0016] As Figure 1 shown, the preform structure for convenient forming and demolding of the present invention includes a bottle mouth part 1, a connecting part 2, a bottle body part 3 and a bottle bottom part 4. An external thread 11 for connecting with a bottle cap is provided on the bottle mouth part 1. The connecting part 2 connects the bottle mouth part 1 and the bottle body part 3 together. A snap ring 6 is provided at the connection between the connecting part 2 and the bottle mouth part 1. The bottle body part 3 is in a straight cylinder shape. A support ring 5 for abutting against the lower end of the bottle cap is also provided on the bottle mouth part 1. The support ring 5 is located between the external thread 11 and the snap ring 6. The connecting part 2 is in a frustum shape and its diameter gradually decreases from top to bottom. The bottle bottom part 4 inclines inward and has a spherical surface 41 that concaves upward at its center.
[0017] The distance between the support ring 5 and the snap ring 6 is 3.5 mm to 7 mm. The cross-section of the support ring 5 is an isosceles trapezoid, and the cross-section of the snap ring 6 is a right trapezoid. A step 51 that can abut against both the inner side surface and the lower end surface of the bottle cap is provided on the support ring 5. The vertical surface and the horizontal surface of the step 51 are in close contact with the bottle cap, which can improve the sealing effect and prevent external substances from entering and contaminating the inside of the bottle.
[0018] The wall thickness of the bottle body part 3 and the bottle bottom part 4 is the same, and the wall thickness of the connecting part 2 gradually increases from top to bottom. The wall thickness of the connecting part 2 is relatively large and will not break even when it is bent outward and stretched downward during the blow molding process.
[0019] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the technical field to which the present invention pertains can make various modifications or supplements to the described specific embodiments or use similar methods for substitution, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.
Claims
1. A preform structure facilitating forming and demolding, comprising a bottle mouth part (1), a connecting part (2), a bottle body part (3) and a bottle bottom part (4). An external thread (11) for connecting with a bottle cap is provided on the bottle mouth part (1), and it is characterized in that, The connecting part (2) connects the bottle mouth part (1) and the bottle body part (3). A snap ring (6) is provided at the connection between the connecting part (2) and the bottle mouth part (1). The bottle body part (3) is in a straight cylindrical shape. A support ring (5) for abutting against the lower end of the bottle cap is also provided on the bottle mouth part (1). The support ring (5) is located between the external thread (11) and the snap ring (6). The connecting part (2) is frustum-shaped and its diameter gradually decreases from top to bottom. The bottom of the bottle (4) inclines inward and has a spherical surface (41) recessed upward at its center.
2. The preform structure for convenient molding and demolding according to claim 1, wherein, The distance between the support ring (5) and the snap ring (6) is 3.5 mm to 7 mm.
3. A preform structure facilitating forming and demolding according to claim 1, characterized in that, The cross-section of the support ring (5) is an isosceles trapezoid.
4. A preform structure facilitating molding and demolding according to claim 1, characterized in that, A step (51) that can abut against both the inner side surface and the lower end surface of the bottle cap is provided on the support ring (5).
5. A preform structure facilitating molding and demolding according to claim 1, characterized in that, The cross-section of the snap ring (6) is a right trapezoid.
6. The preform structure for convenient molding and demolding according to claim 1, characterized in that, The wall thickness of the bottle body part (3) and the bottom of the bottle (4) is the same, and the wall thickness of the connecting part (2) gradually increases from top to bottom.