Delamination Container Protrusions Control Deformation
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Solution Overview
Problem
Conventional synthetic resin-made delamination containers formed by blow molding face challenges in controlling volume-reduction deformation of the containing portion during liquid discharge, leading to potential blockages and incomplete discharge due to irregular separation of the inner layer body from the outer layer body, which increases manufacturing costs.
Innovation Solution
The delamination container incorporates a plurality of protrusions at the upper end of the barrel portion, arranged in the circumferential direction, which project from the outer surface and are recessed on the inner surface, controlling the volume-reduction deformation of the containing portion and preventing irregular separation by ensuring regular deformation patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the containing portion is made separable from the outer layer body, then the volume-reduction deformation is enabled for complete liquid discharge, but irregular separation occurs causing discharge path blockage
Solution Approach 1:
The invention applies local quality by providing adhesion strips at specific locations (upper and lower ends of the containing portion) rather than uniform adhesion throughout. This localized adhesion control allows the intermediate parts to separate irregularly for volume reduction while preventing separation at critical ends, maintaining discharge path stability.
Solution Approach 2:
The adhesion structure is segmented into multiple regions: adhesion strips at the upper end, lower end, and non-adhesion regions in between. This segmentation enables different functional zones - the adhesion strips maintain structural integrity at ends while the non-adhesion zones allow controlled separation for deformation.
2Reliability
If adhesion strips are provided between outer and inner layer bodies, then separation is controlled and deformation is regulated, but manufacturing cost increases
Solution Approach 1:
The invention changes the adhesion parameter by using adhesion strips with specific width ratios (5-50% of containing portion width) and positioning (within 10mm of ends). By optimizing these parameters, the invention achieves reliable separation control with minimal adhesion material, reducing manufacturing cost compared to full-surface adhesion.
Solution Approach 2:
Instead of providing adhesion strips across the entire containing portion (excessive action), the invention uses partial adhesion strips only at the upper and lower ends (partial action). This partial application is sufficient to control separation where needed while avoiding unnecessary material and manufacturing cost in the intermediate regions.
3Volume of moving object
If the inner layer body separates irregularly from the outer layer body, then volume reduction can occur, but the remaining liquid amount increases due to discharge path narrowing
Solution Approach 1:
The invention applies local quality by creating non-adhesion regions in the intermediate parts of the containing portion where separation is permitted. This localized non-adhesion allows the containing portion to bulge outward and maintain wide discharge paths in the intermediate regions, preventing liquid retention while still enabling volume reduction through controlled deformation.
Data Source
AI summary
A delamination container formed by blow molding a preform assembly includes: an outer layer body including a tubular outer mouth portion and a bottomed tubular barrel portion; an inner layer body including a tubular inner mouth portion fixed to an inner side of the outer mouth portion, and a containing portion separably laminated on an inner surface of the barrel portion and capable of volume-reduction deformation; an outside air introduction port; and a plurality of protrusions integrally provided in an upper end part of the barrel portion at intervals in a circumferential direction centering on an axial center of the outer mouth portion, the plurality of protrusions each projecting from an outer surface of the barrel portion and being recessed with respect to the inner surface of the barrel portion.