Curved Seam Plastic Container Head Membrane Design
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Solution Overview
Problem
Plastic containers produced by the blow-molding, filling, and sealing process face issues with particle fragmentation during puncture, leading to clogging and contamination, and existing solutions either require complex tooling or deviate from standard ISO geometries, compromising sterility and functional safety.
Innovation Solution
A container design with a connecting seam on the head membrane that deviates from a rectilinear course, forming thinner, supported penetrable areas that are reinforced by the seam, ensuring secure extraction and addition without unintentional denting or leakage, and allowing for standard cap systems compliant with DIN ISO 15759:2006-05.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a rectilinear connecting seam is used in the head membrane, then the manufacturing process is simple, but the penetrable areas are not sufficiently supported leading to unintentional denting and impaired extraction behavior
Solution Approach 1:
The connecting seam is designed with a curved course instead of a rectilinear path, allowing the seam to extend around the penetrable areas in an arcuate manner. This curvature provides radial support to the penetrable areas, preventing unintentional denting during extraction while maintaining manufacturing feasibility through standard blow molding processes
2Reliability
If the connecting seam extends around the penetrable areas, then the penetrable areas are supported and extraction is improved, but the seam length increases
Solution Approach 1:
The connecting seam is designed to extend around only the penetrable areas rather than forming a complete circle around the entire head membrane. This localized extension provides targeted support precisely where needed at the penetrable areas while minimizing the additional seam length compared to a rectilinear configuration
3Object-generated harmful factors
If thin wall thicknesses are used in the puncturing area, then particle formation is reduced, but the head membrane becomes less rigid and more prone to denting
Solution Approach 1:
The curved connecting seam creates a radial support structure that extends around the penetrable areas, providing localized reinforcement to thin-walled regions. This curvature distributes mechanical loads more effectively, preventing unintentional denting while maintaining the thin wall thickness necessary to minimize particle formation during puncture
4Shape
If the puncture point is close to the edge of the container head, then the double dome geometry is achieved, but there is danger of unintentional puncture of the neck area
Solution Approach 1:
The arcuate connecting seam creates a visual and structural buffer zone between the penetrable areas and the neck area. The curved path of the seam, extending around the penetrable areas, provides a clear visual guide for proper puncture placement and creates a geometric buffer that reduces the risk of unintentional neck puncture even when the penetrable areas are positioned to achieve double dome geometry
Data Source
AI summary
A plastic container product, particularly produced according to a blow-moulding, filling and sealing method, includes a container body having a container content and a head part (12) connected to the container body. The head part defines a removal region (14) closed by a head membrane (16) with joint seam (38) that passes through a surface (20) spanned by the head membrane (16) and that separates at least two penetrable regions (22, 24) on the free front side (26) of the head membrane (16), for the removal of the content. The joint seam (38), observed from the free front side (26) of the head membrane (16), has a seam line (36) that at least partially deviates from an imaginary straight line (32), extends inside the surface (20), is longer than the straight line (32) and at least partially encompasses the penetrable regions (22, 24).