Paper Tear Strip With Folded Layers For Tensile Strength
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing tear strips face challenges in recycling due to difficulty in untangling paper cords and require significant effort in manufacturing, with issues of insufficient elasticity and tensile strength during the separation process.
Innovation Solution
The tear strip is designed with a central band part formed by multiple longitudinal folds, creating at least four layers, and made from kraft paper, with partially or fully glued layers to enhance tear resistance and tensile strength, while maintaining sufficient elasticity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the middle part of the tear strip is made with inserts or overlays to increase tensile strength, then the tear strength is improved, but the manufacturing complexity and effort increase significantly
Solution Approach 1:
The invention merges the function of inserts/overlays with the side folds by integrating the reinforcement directly into the folded structure. The side folds create multiple layers that provide tensile strength without requiring separate insert components, thus combining structural support and reinforcement functions into a single integrated design.
Solution Approach 2:
The invention extracts and eliminates the need for separate inserts or overlays from the design. By using only the folded paper structure itself to provide reinforcement, the patent removes the additional components that would complicate manufacturing, achieving tensile strength through the folded geometry alone.
2Ease of operation
If the lateral strip parts are made with significantly smaller thickness to enable pulling out of guide channel, then the elasticity is improved, but the tear resistance decreases
Solution Approach 1:
The invention compensates for the reduced thickness of lateral parts by utilizing the third dimension through multiple folding layers. The side folds create overlapping layers that increase the effective thickness and tear resistance of the lateral strip parts without compromising their elasticity for guide channel removal.
Solution Approach 2:
The folded structure creates a composite-like configuration where multiple layers of paper work together to provide enhanced mechanical properties. The overlapping layers in the lateral parts achieve both the required elasticity for easy removal and sufficient tear resistance through the combined strength of multiple thin layers.
3Strength
If the paper strip is made thicker to increase tensile strength, then the strength is improved, but the elasticity decreases causing damage when pulled from guide channel
Solution Approach 1:
The invention segments the paper strip into multiple folded layers rather than using a single thick strip. This segmentation allows each layer to remain thin and elastic while the combined multiple layers provide the necessary tensile strength, resolving the contradiction between strength and elasticity.
4Ease of manufacture
If the central area has only three layers to maintain simplicity, then the manufacturing is simpler, but the tensile strength is insufficient for the separation process
Solution Approach 1:
The invention creates a dynamic layered structure where the number of layers varies along the length of the tear strip. The central area has more layers for strength where needed, while the lateral areas have fewer layers for elasticity, optimizing both manufacturing and performance requirements through a dynamic rather than uniform design.
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
The solution provides high tear resistance and tensile strength, facilitating easier recycling and reducing manufacturing complexity by ensuring the tear strip can be pulled out of the guide channel without damage and maintaining high elasticity.
Implementation Method 1
a tear strip made of paper for separating a paper web moving from a plant for producing paper, which is wound up on drums in order to enable it to be wound up on an empty drum, the tear strip consisting of a paper strip which is formed with two longitudinal side folds along which it is folded over one another
Implementation Method 2
The individual layers can be partially or fully glued to one another. In particular, the layers located in the middle area of the tear strip can be glued together
Data Source
Figure 1~3
Figure 4~6
Figure 7~8
AI summary
A paper tearing strip (10) 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, wherein the tearing strip (10) consists of a paper strip (1) which is formed with two longitudinal lateral folds (2, 3) along which it is folded one over the other, wherein the middle strip part (13) has at least 1.5 times the thickness of the lateral strip parts (11, 12), and whose width has at least one fifth of the width of the paper strip (1; 1a) and the widths of the lateral strip parts (11, 12) each have at least one tenth of the width of the middle strip part (13), characterized in that the middle strip part (13) is also formed with at least one fold (4), whereby it is formed in at least four layers.