Insert-Molded Storage Container Side Wall for Strength and Airtightness
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Solution Overview
Problem
The insert molding method for storage containers can impart excellent wear resistance and slidability to side walls and support pieces, but it risks deteriorating the strength and leakage properties due to insufficient bonding between the flat surface of the side wall and the molten resin.
Innovation Solution
The use of a functional resin member with a thick portion and a thin joint portion, where the thin joint portion is interposed into and joined with the container wall, enhances the bonding between the resin member and the container wall, improving the strength and airtightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If insert molding method is used with flat surface side wall, then wear resistance and slidability are improved, but bonding strength and leakage properties deteriorate
Solution Approach 1:
The side wall is divided into two distinct portions: a thick portion that provides wear resistance and slidability, and a thin joint portion that ensures strong bonding with the container body. This segmentation allows each portion to fulfill its specific function optimally without compromising the other.
Solution Approach 2:
Different portions of the side wall are given different thicknesses and properties. The thick portion (equal to or greater than wall thickness) provides durability and wear resistance, while the thin joint portion (less than wall thickness) provides strong bonding surface area for the molten resin, creating local quality variations to resolve the contradiction.
2Ease of manufacture
If simple flat surface configuration is used for side wall peripheral edge, then manufacturing is simplified, but bonding between side wall and molten resin is insufficient
Solution Approach 1:
The side wall peripheral edge is segmented into a thick portion for structural integrity and a thin joint portion for bonding, maintaining relative simplicity while improving bonding through the thin portion that allows better resin penetration and adhesion.
Data Source
AI summary
A storage container with improved strength and airtightness, and a method for manufacturing the storage container are provided. The storage container includes, as a functional resin member, an insert component for a container body insert-molded with a molding material containing predetermined resin. The functional resin member is a side wall plate with support pieces. The side wall plate has a thick portion having at least a thickness of a side wall of the container body, and a thin joint portion formed around the thick portion, to be interposed into and joined to a peripheral wall of the container body. Most of the peripheral wall and the thin joint portion are engaged and joined to enlarge their contact area to eliminate a decrease of the mechanical strength and leakage around the peripheral edge of the side wall plate and prevent the peripheral wall from parting from the side wall plate.