Tear Strip With Thickened Center For Paper Web Separation
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Solution Overview
Problem
Existing tear strips used for severing paper webs during winding onto drums are prone to damage and weakening when pulled out of guide channels, leading to potential tearing and guide channel blockages, which disrupts the winding process and results in substandard paper quality.
Innovation Solution
A tear strip design featuring a central strip part with at least 1.5 times the thickness of the lateral parts and a width approximately half or less than the total width, composed of paper cords or layers, with decreasing thickness from the center to the edges, ensuring high tear strength and elasticity to prevent damage during separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a tear strip with uniform thickness and strength is used, then the tear strip can be easily manufactured, but it is prone to damage and tearing when pulled out of the guide channel
Solution Approach 1:
The tear strip features non-uniform thickness distribution with a thicker central region and thinner lateral regions. The central region has enhanced strength to prevent tearing during extraction, while the lateral regions are thinner to reduce resistance in the guide channel. This local differentiation of properties resolves the contradiction between manufacturability and reliability.
Solution Approach 2:
The tear strip is constructed as a composite structure combining paper strip with reinforcing elements (paper cords or additional paper layers) concentrated in the central region. This composite design provides localized strength enhancement where needed while maintaining overall structural integrity and ease of manufacture.
2Strength
If the tear strip has sufficient width to prevent lateral damage, then it maintains strength during extraction, but it may get blocked in the guide channel opening
Solution Approach 1:
The tear strip design concentrates the necessary strength in the central region through increased thickness and reinforcing elements, while the lateral regions are kept thinner. This allows the strip to have sufficient overall width for strength but with reduced lateral bulk that minimizes blocking in the guide channel opening.
Solution Approach 2:
The tear strip is effectively segmented into functional zones: a central reinforcement zone for strength and lateral zones for reduced resistance. This segmentation allows different parts of the same component to serve different functions, resolving the contradiction between strength and ease of operation.
3Ease of operation
If the lateral areas of the tear strip are thin to reduce guide channel resistance, then it moves easily through the channel, but it is prone to tearing off during extraction
Solution Approach 1:
The tear strip features localized thickness variation where the central region is thicker for strength and the lateral regions are thinner for reduced resistance. This spatial differentiation of thickness properties simultaneously achieves both ease of operation and sufficient strength.
Solution Approach 2:
The composite construction with paper cords or additional layers concentrated in the central region provides localized reinforcement that prevents tearing in the critical extraction zone while allowing thinner lateral regions for reduced guide channel resistance.
4Adaptability or versatility
If the tear strip is made of paper to enable recycling, then it is environmentally friendly and recyclable, but it lacks the durability of synthetic materials for repeated use
Solution Approach 1:
The tear strip uses a composite structure of paper base material with embedded paper cords or additional paper layers. This composite paper construction enhances the mechanical strength and reliability of the inherently weaker paper material, making it suitable for the extraction process while maintaining full recyclability and environmental compatibility.
Solution Approach 2:
The physical parameters of the paper material are modified through the composite construction, particularly the thickness and strength characteristics in the central region. This parameter enhancement allows paper to achieve the necessary reliability for the application while preserving its recyclable nature.
Data Source
Figure 1~1A
Figure 2~2B
Figure 3~3B
AI summary
A paper tearing strip (1) for separating a paper web moving from a paper production plant, which is wound onto drums, in order to enable its winding onto an empty drum. The tearing strip (1) has in cross-section a central strip section (11) and two lateral strip sections (12), wherein the central strip section (1) has at least 1.5 times the thickness of the lateral strip sections (12).