Rounded Cutting Element Vertex for Multilayer Container Opening
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Solution Overview
Problem
Existing opening devices for multilayer containers, particularly those made of laminar materials with increased mechanical strength, face difficulty in cutting through the punchable portion due to the toughness of materials like LLDPE and LDPE, leading to excessive effort and bending of the cutting element's vertex.
Innovation Solution
The cutting element's vertex is designed to be rounded with a curvature radius between 0.15 and 0.30 mm, and the cutting edge is connected to the vertex, allowing it to penetrate and tear the punchable portion effectively without bending, while a second tooth with a sharpened vertex is used to mesh and yield the laminate, facilitating the cutting process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the cutting element has a sharpened vertex, then the cutting edge is more effective for cutting, but the vertex bends under excessive stress when cutting multilayer containers with tough materials
Solution Approach 1:
The vertex of the cutting element is designed with a rounded shape instead of a sharp point, having a curvature radius between 0.15 and 0.30 mm. This curvature allows the vertex to distribute stress more evenly during cutting, preventing bending while maintaining effective cutting performance on multilayer containers with tough materials like LLDPE and LDPE
2Reliability
If the multilayer container uses thermoplastic materials like LLDPE and LDPE, then the sealing characteristic is improved, but the toughness increases causing excessive effort and difficulty in cutting
Solution Approach 1:
The invention changes the geometric parameter of the cutting element vertex from sharp to rounded with a specific curvature radius (0.15-0.30 mm). This parameter change allows the cutting element to effectively penetrate and cut through the tough thermoplastic materials (LLDPE and LDPE) used in multilayer containers while maintaining the sealing characteristics provided by these materials
Data Source
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AI summary
Opening device (1) of the type constrainable to a multilayer container (2) for products pourable at one punchable portion thereof, said opening device comprising a collar (4) couplable to said punchable portion, and a cutting element (5) moving inside said collar (4) in a way constrained by helical guide means (60) interposed between said cutting element (5) and said collar (4), said cutting element (5) comprising at least one first tooth (6) having a substantially triangular section and provided with at least one ending portion (7) having a vertex (7a), to punch said at least one punchable portion, said at least one ending portion is rounded at least next to said at least one vertex, said tooth is provided with at least two flanks (8, 9), at least one side face (10), at least one cutting edge (11) defined by the intersection of said side face (10) with at least one of said flanks (8), said cutting edge (11) being connected over said ending portion, next to said vertex (7a).