Hard-Shell Suitcase Foam Insert Separation Design
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Solution Overview
Problem
Existing hard-shell cases face challenges in recycling due to the adhesion of different materials, such as polyurethane foam inserts to plastic shells, making separation and recycling difficult.
Innovation Solution
The shell bodies are designed with geometric positive connections and frictional fits to securely hold foam inserts without adhesives, allowing easy removal during recycling by using a polypropylene material for the shells and polyurethane foam inserts that are produced with specific ratios of polyol and isocyanate, and optionally coated with release agents to prevent adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If foam inserts are foamed into the shell bodies forming an adhesive bond, then the foam inserts are securely held in the shell bodies, but the different materials cannot be separated for recycling
Solution Approach 1:
The foam insert and shell body are designed as separable components. The foam insert can be removed from the shell body after use, allowing the plastic shell to be recycled separately from the polyurethane foam insert.
Solution Approach 2:
A release agent is applied as an intermediary substance between the foam insert and shell body surfaces. This release agent prevents direct adhesion while still allowing the foam insert to be securely held during normal use, and enables easy separation for recycling.
2Reliability
If foam inserts are glued into the interior of the shell bodies, then the foam inserts are securely fixed, but the foam inserts cannot be easily removed during recycling
Solution Approach 1:
The adhesive bonding is replaced by a mechanical retention system using geometric positive connections and frictional fits. This allows the foam insert to be securely fixed during use but easily removed when needed for recycling by simply pulling it out without tools.
Solution Approach 2:
A release agent is used as an intermediary that prevents permanent adhesion between the foam insert and shell body, allowing secure holding during use while enabling easy removal during recycling operations.
3Strength
If the shell bodies are made from a single piece of plastic with foils, mats, or stickers attached, then the shell has good structural integrity, but the materials cannot be separated for recycling
Solution Approach 1:
The shell body components (foam insert, shell body, foils, mats, stickers) are designed as separate segments that can be easily detached from one another. Each component maintains its structural integrity independently while allowing for separate recycling streams.
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
Enables easy separation and recycling of shell case components with minimal environmental impact by preventing foam inserts from adhering to the shell, maintaining structural integrity and reducing waste.
Implementation Method 1
the at least one foam insert is introduced in a self-retaining manner into at least one of the shell bodies by means of a geometric positive connection and/or by means of a frictional connection
Implementation Method 2
the at least one foam insert is produced from a reaction mixture comprising at least polyol and isocyanate
Data Source
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AI summary
The invention relates to a hard-shell suitcase (100) comprising a first shell body (10) and a second shell body (11) pivotally connected to it, wherein at least one foam insert (12, 13) is incorporated into at least one of the shell bodies (10, 11), and at least one of the foam inserts (13) is made of a polyurethane material. According to the invention, at least one foam insert (12, 13) is self-retainingly incorporated into at least one of the shell bodies (10, 11) by means of a geometric form fit and/or a friction fit. The invention further relates to a method for manufacturing such a hard-shell suitcase (100).