Sheet Winding Recess and Foaming Buffer for Indentation Transfer
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Solution Overview
Problem
The existing sheet winding structures experience indentation transfer due to sheet thickness or adhesive colloidality, leading to surface deformation and reduced utility rates, especially when sheets are wound on paper tubes and used over time.
Innovation Solution
A sheet winding structure featuring a winding core with a recess on its outer surface, where the beginning portion of the sheet is disposed within the recess, and a buffer layer composed of a foaming material with high LDPE content to minimize indentation transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the sheet is winded on the paper tube, then the sheet can be stored and transported, but indentation transfer occurs due to sheet thickness or adhesive colloidality causing surface deformation
Solution Approach 1:
The recess is positioned specifically at the beginning portion of the sheet where the first layer contacts the winding core. This localized structural modification allows the first layer to be recessed into the groove, preventing it from pressing against subsequent layers and causing indentation transfer, while the rest of the winding core maintains its standard cylindrical surface for normal winding operations.
Solution Approach 2:
The winding core surface is segmented into two distinct regions: a recessed portion at the beginning where the first sheet layer is positioned, and a standard cylindrical surface for the remaining layers. This segmentation isolates the problematic beginning portion from the rest of the winding structure, preventing indentation propagation to outer layers.
2Duration of action of stationary object
If the sheet is placed for a long time, then storage duration is extended, but the beginning portion deforms and affects outer layers reducing utility rate
Solution Approach 1:
The recess structure serves as a pre-designed cushioning feature that accommodates the first layer of sheet material. By providing this recessed space beforehand, the structure prevents the beginning portion from deforming under the weight of subsequent layers or during long-term storage, thereby maintaining sheet usability and preventing indentation transfer to outer layers.
3Manufacturing precision
If the beginning portion of the sheet is disposed in the recess, then indentation transfer is reduced, but the winding core structure becomes more complex
Solution Approach 1:
Instead of modifying the entire winding core structure, only a localized recess is created at the beginning portion where it is most needed. This approach achieves the goal of preventing indentation transfer while minimizing the increase in structural complexity, as the majority of the winding core remains a simple cylindrical shape suitable for standard winding operations.
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 recess design and foaming buffer layer significantly reduce indentation transfer, maintaining surface uniformity and extending the usability of sheets by minimizing deformation and cost through effective gap compensation.
Implementation Method 1
a buffer layer disposed on the outer surface of the tube body, wherein the buffer layer comprises a foaming material... The foaming material comprises more than 90% of LDPE... the foaming magnification of the foaming material is 10～33, and the thickness of the foaming material is 1～3.3 mm
Data Source
AI summary
The present invention discloses a sheet winding structure to reduce indentation transfer occurring because of sheet thickness or adhesive colloidality of the innermost layer of the sheet. The sheet winding structure comprises: a winding core having an outer surface, wherein the outer surface of the winding core comprises a recess thereon; and a sheet winded over the outer surface of the winding core, wherein a beginning portion of the sheet is disposed in the recess.