Roll Body with Anisotropic Web Expansion Resists Telescope Deformation
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Solution Overview
Problem
The telescope phenomenon occurs in roll bodies due to thermal expansion differences between the winding core and the web, leading to increased winding pressure and deformation during transportation and storage at higher ambient temperatures.
Innovation Solution
A roll body configuration where the web has a linear expansion coefficient in the thickness direction 60 to 150 times that of the longitudinal direction, and a winding core with a linear expansion coefficient of 20×10−6/K to 100×10−6/K and a Young's modulus of 0.2 GPa to 0.5 GPa, minimizing thermal expansion differences and suppressing winding pressure increases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the roll body is packaged with a moisture-proof packaging film to suppress the telescope phenomenon, then the web is protected from moisture, but the telescope phenomenon cannot be effectively suppressed because the root cause is thermal expansion difference, not moisture absorption
Solution Approach 1:
The invention changes the physical parameters of the web by controlling its thermal expansion coefficient in the thickness direction to be 60-150 times larger than in the longitudinal direction. This parameter change allows the web to compensate for the thermal expansion of the winding core, maintaining winding pressure and suppressing the telescope phenomenon without requiring moisture-proof packaging
Solution Approach 2:
The invention uses a composite structure consisting of the winding core and the web with specific thermal expansion characteristics. The web acts as a compensating element that interacts thermally with the winding core, creating a system where thermal expansion differences are utilized rather than fought against, eliminating the need for additional packaging materials
2Reliability
If the ambient temperature during transportation and storage is higher than during production, then the roll body must be stored in controlled environments, but this increases storage costs and complexity while the telescope phenomenon still occurs due to thermal expansion differences
Solution Approach 1:
The invention modifies the thermal expansion parameters of the web to create anisotropic expansion behavior (60-150 times difference between thickness and longitudinal directions). This allows the web to expand in the thickness direction to compensate for core expansion at higher temperatures, enabling stable storage without temperature control
Solution Approach 2:
The invention converts the harmful effect of thermal expansion (which causes telescope phenomenon) into a beneficial compensating mechanism. The web's large thickness-direction expansion coefficient causes it to expand and maintain pressure on the core when temperature rises, transforming thermal expansion from a problem into a solution
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
Effectively suppresses the telescope phenomenon by reducing winding pressure variations, preventing deformation even at higher storage temperatures.
Implementation Method 1
the linear expansion coefficient of the web in the thickness direction is in the range of 60 to 150 times the linear expansion coefficient in the longitudinal direction. The winding core has a linear expansion coefficient in a range of 20×10−6/K to 100×10−6/K
Data Source
AI summary
Provided is a roll body capable of effectively suppressing the occurrence of a telescope phenomenon even if the ambient temperature during transportation and storage of the roll body becomes higher than that during production of the roll body. A roll body RB according to the present invention configured by winding a belt-shaped web around a winding core that thermally expands or contracts due to an influence of a surrounding environment is characterized in that a linear expansion coefficient of the web in a thickness direction is in a range of 60 to 150 times a linear expansion coefficient of the web in a longitudinal direction, and the winding core has a linear expansion coefficient in a range of 20×10−6/K to 100×10−6/K and a Young's modulus in a range of 0.2 GPa to 0.5 GPa.