Asymmetric Tooth Geometry for Reliable Package Unsealing
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Solution Overview
Problem
Existing opening devices for sealed packages, such as those used for pourable food products, often suffer from damaged cutting teeth during manufacturing, leading to suboptimal interaction with the pierceable portion and inefficient opening operations.
Innovation Solution
An opening device featuring a tubular cutter with a unique configuration of teeth, including multiple cutting faces and edges arranged in a scalene triangle shape, which reduces the likelihood of deformation and enhances the reliability of unsealing the package.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If triangular teeth with pointed tips are used in the cutter, then the cutting effectiveness is improved, but the teeth are prone to damage during manufacturing and handling
Solution Approach 1:
The patent applies asymmetry by changing the tooth geometry from a symmetric pointed triangle to an asymmetric configuration where one face is sharper than the other. The first cutting face has a smaller angle with the cutting edge than the second cutting face, creating an asymmetric tooth profile that maintains cutting effectiveness while improving structural reliability during manufacturing and handling.
2Ease of manufacture
If the cutter is manufactured by injection molding and dropped from the mold, then the manufacturing process is simple and economical, but the pointed tips may deform during the dropping process
Solution Approach 1:
The patent applies beforehand cushioning by designing the tooth geometry to be more resistant to impact damage before the actual cutting operation. The asymmetric configuration with a broader base and angled faces provides structural cushioning that protects the cutting edges from deformation during the manufacturing process, particularly during the dropping operation from the injection mold.
3Strength
If multiple cutting faces are provided on each tooth, then the cutting forces are distributed more effectively, but the tooth geometry becomes more complex
Solution Approach 1:
The patent applies local quality by providing different cutting face angles on different portions of the same tooth. The first cutting face has a different angle than the second cutting face, creating localized variations in geometry that optimize force distribution during cutting while maintaining a relatively simple overall tooth structure that does not significantly increase manufacturing complexity.
Data Source
AI summary
An opening device for a sealed package containing pourable product defines an axis and includes a frame fittable about a pierceable portion of the package and defining a pour opening coaxial with axis; a cap coaxially fitted onto the frame to close the pour opening; a tubular cutter engaging the pour opening coaxially with axis and movable relative to the frame to cut the pierceable portion; and a cutter protruding from one axial end of the cutter and cooperable with the pierceable portion to unseal the package; the cutter including at least one tooth having first and second cutting faces extending transversally to axis; the tooth also including one third cutting face between the first and second cutting faces and extending transversally to the first and second cutting faces; a first edge between the third and first cutting faces; and a second edge between the third and second cutting faces.