Delaminatable Container Bottom Seal Protrusion Design
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Solution Overview
Problem
The existing delaminatable container manufacturing process requires a complex die structure and increased production costs due to the need for pins to press a parison welded layer, necessitating a simpler configuration to reinforce the sealing portion.
Innovation Solution
A delaminatable container design featuring a container body with a bottom seal protrusion that includes a tapered portion extending from the bottom surface, which is configured to seal the outer shell and inner bag, and a thin wall portion, allowing for a simpler die structure and improved impact resistance through welding of the outer layer in a partial region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If pins are added to the die to press the parison welded layer, then the sealing portion strength is improved, but the die structure complexity increases and production cost increases
Solution Approach 1:
The invention transitions from using pins (point contact in one dimension) to a tapered surface (surface contact in two dimensions). The tapered surface of the bottom seal protrusion creates a distributed pressing action across the welded layer during blow molding, achieving reinforcement without requiring additional pin components or complex die mechanisms.
Solution Approach 2:
The bottom seal protrusion with its tapered surface automatically presses and reinforces the welded layer during the normal blow molding process itself, without requiring separate pressing mechanisms or additional steps. The molding process inherently performs the reinforcement function through the geometric design of the protrusion.
2Strength
If multiple welded layers with protrusions are used to increase sealing portion strength, then the impact resistance is improved, but the manufacturing process complexity increases
Solution Approach 1:
The tapered surface is localized specifically at the bottom seal protrusion where reinforcement is needed, while the rest of the container maintains its normal structure. This concentrated local reinforcement achieves improved impact resistance without requiring complex multi-layer protrusions throughout the entire container structure.
Solution Approach 2:
The invention changes the geometric parameters of the bottom seal protrusion by introducing a tapered surface with specific inclination angles. This parameter modification allows the single protrusion to perform the function that would otherwise require multiple protrusions, simplifying the manufacturing process while maintaining strength.
3Strength
If a complex die structure with pins is used to reinforce the sealing portion, then the sealing strength is improved, but the productivity decreases due to longer cycle time
Solution Approach 1:
The tapered surface geometry is pre-built into the bottom seal protrusion structure before the blow molding process begins. During molding, the parison is automatically pressed and reinforced by this pre-formed tapered surface, eliminating the need for additional pressing operations or cycle time extensions that would be required with pin-based systems.
Solution Approach 2:
The blow molding process itself performs the reinforcement function through the interaction between the parison and the tapered surface of the bottom seal protrusion. No separate reinforcement step or additional equipment is needed, maintaining the original production cycle time while achieving improved sealing strength.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design reduces production costs and enhances the impact resistance of the sealing portion by using a tapered bottom seal protrusion and thin wall portion, facilitating easier manufacturing and improved performance without the need for complex die structures.
Implementation Method 1
the container body includes a storage portion to store the contents and a bottom seal protrusion protruding from a bottom surface of the storage portion... the bottom seal protrusion includes a tapered portion extending in a longitudinal direction of the bottom seal protrusion and tapered from the bottom surface toward an end
Implementation Method 2
the container body is configured to seal the outer shell and the inner bag in the bottom seal protrusion... the outer layer constituting the outer shell welded to each other at least in a partial region
Data Source
AI summary
A delaminatable container excellent in productivity is provided. The present invention provides a delaminatable container comprising a container body having an outer shell and an inner bag, the inner bag to be shrunk with a decrease in contents, wherein the container body includes a storage portion to store the contents and a bottom seal protrusion protruding from a bottom surface of the storage portion, the container body is configured to seal the outer shell and the inner bag in the bottom seal protrusion, and the bottom seal protrusion includes a tapered portion extending in a longitudinal direction of the bottom seal protrusion and tapered from the bottom surface toward an end.