Heating Pressurization Unit for Multi-Size Booklet Bonding
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Solution Overview
Problem
Existing booklet production apparatuses face challenges in maintaining uniform pressurization force distribution when handling sheets of different sizes, leading to reduced pressurization in areas other than the end portions of smaller sheets.
Innovation Solution
The apparatus employs an elongate heating pressurization unit with a pressurization plate, heating member, and reception member, which applies a customized pressurization force profile to ensure uniform heating and pressurization across varying sheet sizes, including a minimum value at specific regions and increased pressure at strategic locations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the heating pressurization unit is configured to pressurize large-size sheets with uniform pressurization force distribution, then large-size sheets are properly bonded, but small-size sheets experience pressurization force concentration at end portions with reduced pressure in other areas
Solution Approach 1:
The pressurization plate is designed with varying thickness in the longitudinal direction, creating different local stiffness characteristics. The thicker portion provides greater pressurization force in regions where small sheets would otherwise experience force concentration, while the thinner portion allows appropriate pressure distribution for large sheets. This local variation in structural properties enables the same pressurization unit to adapt to different sheet sizes effectively.
Solution Approach 2:
The patent changes the physical parameter of the pressurization plate (thickness) to modify its mechanical properties. By varying the thickness along the longitudinal direction, the stiffness and pressure distribution characteristics of the pressurization plate are adjusted, allowing it to provide appropriate pressurization force distribution for both large and small sheet sizes without requiring multiple specialized units.
2Device complexity
If a uniform pressurization plate is used for all sheet sizes, then the structure is simple, but pressurization force distribution becomes inappropriate for small-size sheets
Solution Approach 1:
Rather than using completely different pressurization plates for different sheet sizes, the patent implements local quality variation within a single plate structure. The thickness of the pressurization plate varies in specific regions (longitudinal direction) to provide locally optimized pressurization characteristics, balancing structural simplicity with functional precision.
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 approach ensures consistent bonding quality by maintaining appropriate pressurization force distribution, regardless of sheet size, resulting in robust and uniform booklets.
Implementation Method 1
a heating member configured to heat the pressurization plate
Implementation Method 2
a pressurization mechanism configured to apply a pressure to the sheets nipped between the pressurization plate and the reception member
Implementation Method 3
heat and pressurize the adhesive layers
Data Source
AI summary
In a case where a region of a heating pressurization unit in a longitudinal direction of the heating pressurization unit where the heating pressurization unit heats and pressurizes a sheet of a maximum size is a first region, and a region of the heating pressurization unit in the longitudinal direction where the heating pressurization unit heats and pressurizes a sheet of a minimum size is a second region, and a region of the heating pressurization unit inside the first region and outside the second region in the longitudinal direction is a third region, the heating pressurization unit heats and pressurizes the sheet of the maximum size with a pressurization force profile having a minimum value in the longitudinal direction at a position in the third region or a position of an end portion of the second region adjacent to the third region.