Plastic Bottle Crate Pinch Strip Demarcation
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Solution Overview
Problem
Existing methods for producing plastic containers with multiple plastic materials struggle to maintain a clear and distinct demarcation between different plastic areas, especially at high cycle times, affecting the container's appearance and production efficiency.
Innovation Solution
A pinch strip design is implemented as a sealing strip that deforms when the mold contacts a squeeze bar, creating a closed chamber to prevent the second plastic from exceeding its designated area, with optional grooves and recesses to enhance the demarcation and deformation, and varying dimensions based on container size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a sealing strip is used to demarcate between first and second plastic areas, then a clear demarcation is achieved, but cycle times increase due to additional separate measures
Solution Approach 1:
The sealing strip is integrated directly into the first plastic during the initial injection molding process, eliminating the need for separate sealing strip application steps. The sealing strip is formed as part of the mold cavity structure, allowing the demarcation function to be achieved without additional cycle time for separate sealing operations.
Solution Approach 2:
The sealing strip is pre-formed in the mold cavity before the second plastic is injected. The mold structure includes a sealing strip formation cavity that creates the sealing strip in advance, so that when the second plastic is injected, the sealing strip is already in position to prevent overflow, eliminating the need for post-injection sealing measures.
2Manufacturing precision
If the sealing strip is made prominent to ensure clear demarcation, then the appearance is improved, but the complexity of the mold structure increases
Solution Approach 1:
The mold cavity is segmented into distinct regions: a first plastic formation cavity, a sealing strip formation cavity, and a second plastic reception cavity. This segmentation allows the sealing strip to be formed as a separate, prominent element within the mold structure, achieving clear demarcation while keeping the mold design modular and manageable.
Solution Approach 2:
The sealing strip is formed with specific local properties different from the main plastic body. The sealing strip formation cavity creates a prominent sealing strip with appropriate height and cross-section to ensure clear demarcation. The local quality of the sealing strip (its prominence, material properties, and geometry) is optimized independently to achieve the desired demarcation clarity without unnecessarily complicating the entire mold 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 solution ensures a clear-cut demarcation between plastic areas, simplifying production and maintaining aesthetic appearance, even at fast cycle times, by limiting the pinching process and facilitating precise mold deformation.
Implementation Method 1
the mold comes into contact with the squeezing bar and the area in which the mold is attached to the squeezing bar is deformed
Data Source
Figure 1~3
AI summary
The drinks crate has a base and walls made from a first plastic (1). A section (2) made from a second plastic, e.g. for forming a more comfortable handle, is injection molded on to this. A separating strip (3) in the top edge of the wall fits against the inner surface of the mold (6) during molding.