Rectilinear Transition Section in Plastic Container Mouth
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Solution Overview
Problem
Existing plastic containers, particularly PET bottles, face issues with filling products that result in excessive foaming and flow disruption due to their interior design, leading to the filling product breaking off and inefficient material distribution.
Innovation Solution
A plastic container design featuring a mouth area with a rectilinear transition section that widens from the mouth to the shoulder, allowing for a smooth, angled flow along the inner wall, reducing material accumulation and enabling uniform filling without breaking off, while also optimizing material distribution by allowing more material to be used elsewhere on the container.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional container design with cylindrical section and curved transition area is used, then the container structure is simple and easy to manufacture, but the filling product flow is disrupted and excessive foaming occurs
Solution Approach 1:
The transition area is segmented into multiple distinct sections: a first section with a rectilinear course extending from the mouth area, a second section with a different curvature radius, and a third section leading to the shoulder area. This segmentation allows each section to perform its specific function - the rectilinear section guides flow smoothly, while subsequent sections provide gradual transitions, collectively solving the foaming problem without compromising manufacturability
Solution Approach 2:
The invention applies controlled curvature variations through multiple sections with different curvature radii. The rectilinear first section has minimal curvature, followed by a second section with a first curvature radius, and a third section with a second curvature radius. This progressive curvature approach maintains smooth flow guidance while enabling standard manufacturing processes
2Productivity
If the transition area has a rectilinear course section, then the filling flow remains smooth and foaming is reduced, but the material distribution in the mouth area changes requiring more material elsewhere
Solution Approach 1:
The invention applies different geometric characteristics to different sections of the transition area. The first section has a rectilinear course optimized for flow guidance, while the second and third sections have specific curvature radii optimized for material distribution. This local differentiation allows the mouth area to use less material while maintaining filling efficiency, as the rectilinear section prevents material accumulation
3Ease of manufacture
If the container interior design is simplified, then manufacturing is easier, but the filling product does not run off over the wall smoothly and flow breaks off
Solution Approach 1:
The invention uses a combination of rectilinear and curved sections with specifically defined curvature radii. The first section extends rectilinearly from the mouth area to provide smooth flow guidance, while the second and third sections incorporate controlled curvature to ensure continuous flow along the wall. This geometric design achieves flow smoothness without complex interior structures
Data Source
Figure 1~2
Figure 3~4
Figure 4a~5
AI summary
A plastic container (1) with an opening area (2), a shoulder area (4) extending in a longitudinal direction (L) of the plastic container (1) to the opening area, a base body (6) extending in the longitudinal direction (L) of the plastic container (1) to this shoulder area (4), and a bottom area (8) extending in the longitudinal direction (L) of the plastic container (1) to the base body (6), wherein the shoulder area (4) extends in the longitudinal direction (L) of the plastic container (1) from the opening area (2) towards the base body (6), and wherein a transition area (12) is provided between the opening area (2) and the shoulder area (4), wherein the transition area (12) has a section (14) extending in the longitudinal direction (L) of the plastic container from the opening (2) towards the shoulder area (4) with a straight course,wherein the transition area (12) next to the section (14) with the straight course has a further section (16) extending from the mouth area (2) in the direction of the base body (6) to the section (14), wherein the section (16) has a curved course, in particular concave.