Delamination Container Opening End Layer Coverage
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Solution Overview
Problem
Conventional delamination containers face issues with the inner layer peeling from the opening end, especially when the pump-mounted cap is not fitted, and the exposure of the intermediate layer leads to decreased barrier properties due to water vapor influence.
Innovation Solution
A delamination container design where the outer layer body and inner layer body cover the end portion of the intermediate layer at the opening end, with a moil cut portion and tapered surface to prevent peeling and maintain barrier properties, formed through direct-blow molding with a three-layer structure of resin materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the intermediate layer is exposed to the outside at the opening end of the mouth, then the manufacturing process is simplified, but the barrier properties of the intermediate layer are decreased due to water vapor influence
Solution Approach 1:
The intermediate layer is nested between the outer layer body and the inner layer body at the opening end of the mouth, with the outer layer body covering the end portion of the intermediate layer. This nested structure protects the intermediate layer's barrier properties while maintaining the three-layer molded structure.
Solution Approach 2:
The outer layer body is designed to cover the end portion of the intermediate layer at the opening end before the container is used. This preliminary protective arrangement ensures the intermediate layer is protected from water vapor exposure throughout the product lifecycle.
2Device complexity
If the intermediate layer is exposed to the outside at the opening end of the mouth, then the structure is simpler, but the inner layer body peels from the outer layer body at the opening end
Solution Approach 1:
The intermediate layer is nested between the outer layer body and the inner layer body, with the outer layer body covering the end portion of the intermediate layer at the opening end. This nested configuration ensures the intermediate layer remains sandwiched between the other layers, preventing peeling while maintaining structural integrity.
Solution Approach 2:
The outer layer body acts as an intermediary that covers and protects the end portion of the intermediate layer at the opening end, preventing direct exposure and eliminating the peeling initiation point while maintaining the three-layer structure.
3Reliability
If the pump-mounted cap is fitted to prevent peeling, then the inner layer body is protected from peeling when the cap is fitted, but the inner layer body still peels when the cap is not fitted during distribution
Solution Approach 1:
The outer layer body is designed to cover the end portion of the intermediate layer at the opening end from the manufacturing stage, providing preliminary protection that is always in place regardless of whether the pump-mounted cap is fitted. This eliminates the need for the cap to provide peeling prevention.
Solution Approach 2:
The outer layer body serves as a permanent intermediary structure that covers the intermediate layer's end portion, providing continuous protection against peeling under all conditions (with or without the pump-mounted cap fitted) without requiring the cap for this function.
Data Source
AI summary
A delamination container (1) formed in a shape including a tubular mouth (la) and a trunk (1b), the container (1) including: an outer layer body (2) formed of a resin material; an inner layer body (3) formed of a resin material and disposed on an inner side of the outer layer body (2); and an intermediate layer (4) formed of a resin material different from those forming the outer and inner layer bodies (2) and (3) and disposed between the outer and inner layer bodies (2) and (3). The outer and inner layer bodies (2) and (3) and the intermediate layer (4) are formed by direct-blow molding a laminated parison including resin layers corresponding to them. At an opening end of the mouth (1a), an end portion of the intermediate layer (4) is covered by the outer and inner layer bodies (2) and (3).