Method for producing coreless roll paper
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Solution Overview
Problem
Existing methods for producing coreless roll paper face challenges in preventing deformation when the winding shaft is extracted, particularly when the tissue material is loosely wound, making it difficult to balance core strength and ease of layer separation.
Innovation Solution
A method involving a winding shaft with gear-like grooves and a cover member that is left in the roll paper during extraction, allowing the shaft to be removed without pulling out the winding-start end, and enabling easy separation of tissue layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the tissue material is tightly wound on the winding shaft to form a strong inner solidified layer, then the core strength is improved, but the ease of layer separation deteriorates
Solution Approach 1:
The winding shaft outer circumferential surface is divided into ridge portions and groove portions, creating segmented contact zones. The tissue material is wound such that only portions corresponding to the ridge portions are adhered together, while portions corresponding to the groove portions remain separated. This segmentation allows the inner solidified layer to maintain structural strength while preserving ease of layer separation at the groove portions.
Solution Approach 2:
Different regions of the tissue material layers are given different properties: portions at ridge positions have strong adhesion for structural integrity, while portions at groove positions have weak or no adhesion for easy separation. This local differentiation of adhesive properties resolves the contradiction between overall strength and local separability.
2Ease of operation
If a grooved winding shaft is used to enable loose winding and easy layer separation, then the ease of layer separation is improved, but the reliability of preventing winding-start end pull-out deteriorates
Solution Approach 1:
A cover member is placed on the winding shaft before the tissue material is wound. This preliminary placement of the cover member prevents the winding-start end from being pulled out during shaft extraction, while the grooved structure of the shaft (visible through or alongside the cover member) still enables easy layer separation in the main body of the roll paper.
3Ease of operation
If the tissue material is loosely wound to allow easy layer separation, then the ease of layer separation is improved, but the strength of the inner solidified layer deteriorates
Solution Approach 1:
The winding shaft is segmented into ridge portions and groove portions, creating alternating zones of strong and weak adhesion. The ridge portions provide localized strong bonding to maintain inner solidified layer strength, while the groove portions provide easy separation zones, resolving the contradiction between overall strength and ease of separation.
4Strength
If a typical winding shaft is used to ensure core strength, then the strength of the inner solidified layer is improved, but the ease of layer separation deteriorates
Solution Approach 1:
The winding shaft surface is segmented into alternating ridge and groove portions, creating a patterned adhesion structure. This segmentation allows simultaneous achievement of strong bonding at ridge positions and easy separation at groove positions, resolving the contradiction between strength and ease of separation.
Solution Approach 2:
Different regions of the shaft surface provide different adhesion characteristics: ridge portions create strong local bonds for structural integrity, while groove portions create weak or no bonds for easy separation. This local quality differentiation resolves the contradiction between overall strength and local separability.
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 method effectively prevents deformation of the roll paper by protecting the center hole with the cover member, allowing for stable production of coreless roll paper with both sufficient core strength and easy layer separation.
Implementation Method 1
a cover member is put on and fixed to the body part. In the winding step, the paper is wound on the cover member
Implementation Method 2
a winding shaft having gear-like grooves in the outer circumferential side surface is used. When a tissue material is wound on this grooved winding shaft, the tissue material is wound so as to be stretched between the ridges of the grooves
Implementation Method 3
an application step in which adhesive supply means applies an adhesive to a winding-start end of the paper that is being transported
Data Source
AI summary
A method for producing coreless roll paper includes a winding step in which paper 11 is wound on a shaft 20 in a roll shape, and an extracting step in which the shaft 20 is extracted from roll paper 12 to form a center hole 13. The shaft 20 includes a body part 22 having grooves 23, and a sleeve 30 is put on and fixed to the body part 22. In the winding step, the paper 11 is wound on the sleeve 30.