Segmented Cutter Blade With Obtuse Tooth Angles For Packing Material
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Solution Overview
Problem
Existing cutter blades for packing materials like cling film often cause wrinkling due to the high force required to cut near the outer ends, especially when using non-metallic materials like polyethylene, polypropylene, or polyvinyl chloride, as they necessitate a large force component transverse to the cutting direction.
Innovation Solution
The cutter blade design features tooth tops in the first and second portions positioned opposite to the cutting direction, forming obtuse angles with the intermediate portion, and a larger distance between tooth tops and roots, reducing the force needed for cutting and minimizing wrinkling by allowing efficient cutting near the outer ends.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a straight or V-shaped cutting side is used, then the cutter blade structure is simple, but a large force is required to cut near outer ends causing wrinkling
Solution Approach 1:
The cutting side is divided into three distinct portions (first, intermediate, and second portions) with different tooth configurations. Each portion handles a specific region of the packing material width, allowing optimized cutting geometry for different locations rather than using a uniform straight or V-shaped design throughout.
Solution Approach 2:
Different portions of the cutting side have different tooth characteristics. The intermediate portion has teeth with smaller height and different angular orientation compared to the first and second portions. This local variation in tooth quality allows the cutter to apply appropriate cutting force distribution, reducing transverse forces that cause wrinkling while maintaining structural simplicity.
2Ease of manufacture
If the cutter blade has uniform tooth configuration, then manufacturing is simple, but cutting efficiency varies across the width of the packing material
Solution Approach 1:
The tooth configuration varies locally across different portions of the cutting side. The intermediate portion has teeth with smaller height and different angular orientation compared to the first and second portions. This local variation optimizes cutting efficiency for different regions of the packing material width while maintaining reasonable manufacturing simplicity through modular tooth arrangement.
Data Source
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AI summary
A cutter blade (201, 301) for a packing container (400) accommodating a roll of packing material, wherein said cutter blade (201, 301) is provided with teeth (203, 205, 207, 209, 211, 303, 305, 307, 309, 311) along a cutting side (213, 313) of said cutter blade (201, 301) for cutting said packing material in a cutting direction (C) of said cutter blade (201, 301), wherein said cutting side (213, 313) comprises a first portion (215, 315), a second portion (217, 317) and an intermediate portion (219, 319) between said first portion (215, 315) and said second portion (217, 317), wherein a first tooth top line (225, 325) connects tooth tops of teeth (205) of said first portion (215, 315), a second tooth top line (227, 327) connects tooth tops of teeth (209) of said second portion (217, 317) and wherein an intermediate tooth top line (219, 319) connects tooth tops of teeth (207) of said intermediate portion (219, 319), wherein said first tooth top line (225, 325) and/or said second tooth top line (227, 327) enclose an obtuse angle (G, H) with said intermediate tooth top line (229, 329). A packing container (400) accommodating a roll of packing material comprising a cutter blade according to the present disclosure.