PET Pot Pack Knife Geometry for Repeatable Pre-Cutting
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing cutting tools for PET containers in food product packs face issues of insufficient penetration during pre-cutting, leading to unsatisfactory separation and potential bending, especially when full cuts are required, which can cause mechanical contact and deterioration.
Innovation Solution
The design of a knife and counter-blade with specific angular and dimensional configurations, including angled cutting portions and a pinching distance, ensures sufficient force application and reduces bending, allowing for repeatable pre-cutting and full cutting without mechanical contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a significant force is applied to the cutting tool to achieve sufficient penetration, then the pre-cut quality is improved, but the cutting tool bends and may deteriorate
Solution Approach 1:
The cutting tool is divided into multiple cutting portions (first, second, third, fourth portions) with different angular configurations. Each portion contributes to the cutting action at different stages, distributing the applied force across multiple segments rather than concentrating it on a single cutting edge, thereby reducing bending while maintaining cutting effectiveness.
Solution Approach 2:
The cutting tool design transitions from a simple linear cutting edge to a multi-dimensional angular structure. The cutting portions are arranged at specific angles (20°-40° for the first portion, 15°-25° for the second and fourth portions) relative to the longitudinal axis, creating a three-dimensional cutting geometry that optimizes force distribution and reduces bending moments.
2Manufacturing precision
If the cutting tool is designed to pass through the entire plastic material (total cut), then complete separation is achieved, but mechanical contact between cutting tools occurs causing deterioration
Solution Approach 1:
The cutting tool features asymmetric angular configurations on opposite sides of the longitudinal axis. The first portion has an angle of 20°-40° while the third portion (facing the counter-blade) has an angle of 15°-25°. This asymmetric design creates a pinching action that controls the cutting depth and prevents the cutting tools from making mechanical contact during total cuts.
Solution Approach 2:
The plastic material itself acts as an intermediary between the cutting tool and the counter-blade. The angular cutting portions are designed to pinch and compress the plastic material, using it as a mediator to transmit the cutting force without allowing direct mechanical contact between the cutting tool and counter-blade, thereby preventing tool deterioration.
3Strength
If insufficient force is applied by the cutting tool, then the cutting tool integrity is maintained, but the plastic is not pushed sufficiently against the counterblade resulting in insufficient penetration
Solution Approach 1:
The cutting tool design incorporates dynamic angular geometry that adapts to the cutting process. The multiple cutting portions with different angles (20°-40° and 15°-25°) create a progressive cutting action that dynamically adjusts the force application, allowing sufficient penetration while maintaining tool integrity through optimized force distribution.
Solution Approach 2:
The cutting tool uses specific angular parameters (20°-40° for the first portion, 15°-25° for the second and fourth portions) to optimize the cutting action. These parameter changes in the geometric configuration enable the tool to achieve sufficient penetration depth without requiring excessive force that would cause bending or deterioration.
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
Equipment (20) is proposed for forming a pre-cut in a pack (10) of jars (12) of food product, said pre-cut facilitating separation by break along a separation line (16) between two jars (12) of food product, the equipment (20) comprising at least one knife (26) and at least one counter-blade (28).