Convex Heating Plates for Corrugated Cardboard Thermal Deformation
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Solution Overview
Problem
The existing sheet heating apparatus for manufacturing corrugated cardboard is bulky due to a large heating drum and experiences thermal deformation, leading to inefficient heating as one surface of the curved heating member cools without corresponding cooling of the other surface, causing the sheet to deform and reducing heating efficiency.
Innovation Solution
A sheet heating apparatus with two convex-shaped heating plates joined together by a reinforcing member, where a guide member ensures the sheet contacts both heating surfaces evenly, preventing thermal deformation and maintaining efficient heat transfer by ensuring continuous contact without gaps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a heating type drum is used to heat the sheet, then the sheet can be heated, but the diameter of the heating drum is large causing an increase in the size of the apparatus
Solution Approach 1:
The heating drum is segmented into two separate heating plates (first heating plate and second heating plate), each with its own heating surface. This segmentation allows the heating function to be distributed across two smaller components rather than one large drum, reducing the overall apparatus size while maintaining heating capability.
Solution Approach 2:
The invention transitions from a cylindrical heating drum to flat heating plates arranged in a layered configuration. By changing from a three-dimensional cylindrical shape to two-dimensional plates stacked together, the heating surfaces face each other in opposite directions, enabling compact arrangement and reducing the apparatus footprint.
2Temperature
If one surface of the sheet is heated by a heating surface, then the sheet can be heated, but the temperature of the heating surface decreases and the heating surface contracts while the other surface does not decrease and thus does not contract, causing the heated surface to deform in a recess direction
Solution Approach 1:
The invention uses two heating plates with heating surfaces facing each other in opposite directions, creating a symmetric heating configuration that compensates for thermal contraction. Each plate experiences thermal expansion and contraction equally, preventing the asymmetric deformation that occurs with single-sided heating.
Solution Approach 2:
The second heating plate acts as a counterbalance to the first heating plate, providing opposing thermal forces. When one heating surface contracts due to cooling, the other heating surface contracts in the opposite direction, effectively counteracting the deformation and maintaining sheet stability.
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 apparatus is compact, prevents thermal deformation, and ensures efficient heating of the sheet by maintaining consistent contact with both heating surfaces, enhancing heat transfer efficiency.
Implementation Method 1
a heating section that heats the first heating plate and the second heating plate
Data Source
Figure 1
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AI summary
A sheet heating apparatus, a single facer, and an apparatus for manufacturing a corrugated cardboard sheet are provided with: a first heating plate (51) with a first heating surface (61) thereof curved in a convex shape; a second heating plate (52) with a second heating surface (62) thereof curved in a convex shape; joining members (53, 54) that integrally join together the first heating plate (51) and the second heating plate (52) so as to make the first heating surface (61) and the second heating surface (62) face outward; a heating section (55) that heats the first heating plate (51) and the second heating plate (52); and guide rollers (56, 57) that guide a back liner C so as to contact the first heating surface (61) and the second heating surface (62).