Hollow Plastic Board Assembly for Faster Injection Molding
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Solution Overview
Problem
The production of thick plastic cutting boards via injection-molding faces long cycle times and warping issues due to the need for extensive cooling, which is exacerbated by the requirement for dimensional accuracy and stability.
Innovation Solution
The method involves producing the plastic board from two injection-molded halves with a connecting component molded onto their periphery, forming a cavity between them, and optionally incorporating stabilizing elements and channels to enhance stability and sealing, allowing for a shorter cycle time and reduced material usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the plastic board is injection-molded with a thickness of 8-10 mm to ensure sufficient intrinsic stability, then the mechanical stability is improved, but the cycle time becomes disproportionately long
Solution Approach 1:
The plastic board is divided into two separate injection-molded halves with thicknesses of 4-5 mm each, rather than molding a single thick piece. This segmentation allows each half to cool faster during injection molding, significantly reducing the cycle time while maintaining the overall thickness and stability of the finished board when the halves are joined together.
2Stability of the object's composition
If the plastic board is injection-molded with a thickness of 8-10 mm to ensure sufficient intrinsic stability, then the mechanical stability is improved, but the cooling time becomes disproportionately long
Solution Approach 1:
The thick plastic board is segmented into two thinner halves (4-5 mm each) that are injection-molded separately. Each half requires significantly less cooling time to solidify completely, thereby reducing the overall cooling time while maintaining the necessary mechanical stability through the combined thickness of both halves.
3Loss of time
If the plastic board is demolded when the material has not cooled down sufficiently, then the cycle time is reduced, but warping occurs
Solution Approach 1:
By segmenting the board into two thinner halves, each half cools much faster and can be demolded at an earlier stage without warping. The shorter cooling time required for thin walls allows for rapid demolding while still ensuring the plastic has solidified sufficiently to maintain dimensional accuracy and flatness.
Solution Approach 2:
The two halves are joined together using stabilizing elements and connecting components to form a composite structure. This composite construction allows each component to be produced with optimal thin-wall parameters, and the assembly process ensures flatness and dimensional accuracy without requiring excessively long cooling times for a single thick piece.
4Stability of the object's composition
If the two halves are joined together with stabilizing elements to fix them to one another, then the mechanical stability is improved, but the device complexity increases
Solution Approach 1:
The stabilizing elements and connecting components are integrated into the injection-molding process itself. The stabilizing elements are molded directly onto the halves, and the connecting components are injection-molded to join the halves together. This merging of functions into a single manufacturing process reduces overall complexity despite the multi-component structure.
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 approach significantly reduces production cycle times, enhances mechanical stability, and minimizes material usage while maintaining hygiene and design flexibility, particularly suitable for cutting boards.
Implementation Method 1
In the injection-molding tool, the plastic transitions back into the solid state again as a result of cooling down
Implementation Method 2
this cooling process of course takes a disproportionately long time
Data Source
AI summary
A method for producing a plastic board with an upper side 1, an underside 2 and at least one edge surface 3 by an injection-molding technique, and also a corresponding plastic board are provided. In the method, a first half 6, which forms at least the upper side of the plastic board, and a second half 7, which forms at least the underside of the plastic board, are injection-molded. Then, the first half and the second half are joined together in order to form a plastic board with an upper side and an underside. The two halves being formed in such a way that at least one cavity forms between the halves when they are joined together. The two halves are fixed onto one another, preferably by molding on a connecting component 5 of plastic.