Dual-Direction Shredding Mechanism for Packaging Waste
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Solution Overview
Problem
Thermoforming packaging machines face productivity losses due to time-consuming knife changes and increased wear when processing different packaging materials, which are often tough or abrasive, leading to frequent downtime and reduced productivity.
Innovation Solution
A shredding device with a rotatable knife holder that can operate in two directions, featuring interchangeable knives with adjustable cutting edges and counter-knives, allowing for versatile cutting of various materials without manual knife changes, and a negative pressure system for efficient material conveyance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a shredding device uses blades to cut edge strips, then the volume of waste is reduced and emptying intervals are extended, but the blades wear quickly due to abrasive packaging materials requiring frequent replacement
Solution Approach 1:
The shredding device is divided into two independent knife holders that can rotate in opposite directions. Each knife holder has knives oriented for cutting in its specific rotation direction, allowing the system to handle abrasive materials effectively in both directions without blade wear affecting performance.
Solution Approach 2:
The second knife holder rotates in the opposite direction to the first knife holder. This inversion allows the system to maintain cutting effectiveness regardless of material abrasion direction, extending blade service life by distributing wear across both knife holders rather than concentrating it on one set of blades.
2Adaptability or versatility
If the packaging machine changes from one packaging material to another, then product versatility is improved, but time-consuming knife changes are required leading to machine downtime
Solution Approach 1:
Both knife holders are designed with universal applicability to handle different packaging materials. The knives on both knife holders can process various material types (plastic, fiber-based, composite) depending on their orientation, allowing the system to switch between materials without physical knife changes by simply changing the rotation direction.
Solution Approach 2:
The system dynamically adapts to different packaging materials by changing the rotation direction of the knife holders rather than requiring physical replacement of knives. This dynamic adjustment allows seamless switching between material types while maintaining cutting effectiveness.
3Device complexity
If a single knife holder rotates in one direction, then the structure is simple, but it cannot efficiently process all types of packaging materials with different properties
Solution Approach 1:
The second knife holder rotates in the opposite direction to the first, creating a dual-directional cutting system. This allows the same physical structure to efficiently process different packaging materials (tough, brittle, abrasive) by selecting the appropriate rotation direction, thereby achieving versatility without significantly increasing structural complexity.
Solution Approach 2:
Both knife holders are designed with universal applicability to handle different packaging materials. The knives on both knife holders can process various material types depending on their orientation, allowing the system to switch between materials without physical knife changes by simply changing the rotation direction.
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 reduces downtime by allowing seamless switching between materials, extends knife maintenance intervals, and increases productivity by enabling efficient cutting of diverse packaging materials with minimal operator intervention.
Implementation Method 1
a drive (11) which is designed to rotate the knife holder (7)
Implementation Method 2
a negative pressure system for efficient material conveyance
Data Source
Figure 1
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AI summary
The invention relates to a device (1) for shredding strip-shaped material (2), in particular packaging material, comprising a housing (3) with at least one feed opening (4) for the strip-shaped material (2) and a discharge opening (5) for the shredded material (6), a blade holder (7) which is rotatably mounted within the housing (3) about an axis (8), at least one blade (9) which is attached to the blade holder (7), in particular detachably, and at least one counter blade (10) which is attached to the housing (3), in particular detachably, and a drive (11) which is designed to rotate the blade holder (7). The invention is characterized in that a first direction of rotation (r1) and a second direction of rotation (r2) of the blade holder (7) about the axis (8), opposite to the first, can be predetermined.Furthermore, the invention relates to a method for operating a device (1) for shredding strip-shaped material (2), in particular packaging material. The invention is characterized in that the device (1) incorporates at least one knife holder (7) that is rotatable in both a first direction of rotation (r1) and a second direction of rotation (r2) opposite to the first. The invention further relates to a method for shredding strip-shaped material (2).