Sheet Holder With Diagonal Adhesive Dot Grid
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Solution Overview
Problem
Conventional sheet holders for plotters face challenges in maintaining sheet stability during processing while ensuring easy detachment, particularly with tissue paper, as the bonding strength varies with temperature and humidity, leading to issues like wrinkling and curling.
Innovation Solution
A sheet holder with adhesive dots arranged in a diagonal grid pattern on the upper surface of a sheet-shaped base material, where the formation positions of adjacent dot lines differ in the feeding direction, providing increased bonding strength where needed and allowing for easy detachment without causing sheet deflection or curling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adhesive is applied across the entirety of the upper surface of the sheet holder, then bonding strength is relatively high, but the sheet becomes difficult to detach and may wrinkle or curl
Solution Approach 1:
The adhesive application area is segmented into multiple discrete adhesive dots arranged in dot lines, rather than continuous coverage. This segmentation allows the sheet to be securely held during processing while enabling easy detachment by pulling from corners, as the discrete dots provide sufficient bonding strength without creating excessive overall adhesion that would cause wrinkling or curling upon removal.
Solution Approach 2:
The adhesive dots are strategically positioned at specific locations (e.g., corners and edges) rather than uniformly distributed across the entire surface. This local quality approach provides adequate bonding strength at critical areas for holding the sheet during processing, while leaving other areas adhesive-free to facilitate easy detachment and prevent wrinkling when the sheet is removed.
2Strength
If adhesive concentration is increased to improve bonding strength, then sheet holding is improved, but bonding strength becomes difficult to control due to variations in temperature and humidity
Solution Approach 1:
Instead of controlling bonding strength by adjusting adhesive concentration (which is sensitive to temperature and humidity), the invention changes the parameter to adhesive application pattern - using discrete dots with fixed spacing and size. This parameter change makes the bonding strength more predictable and less sensitive to environmental variations, as the total adhesive amount and distribution are mechanically controlled rather than chemically adjusted.
Solution Approach 2:
The adhesive dots are pre-positioned at specific locations and intervals before the sheet is mounted. This preliminary arrangement ensures consistent bonding characteristics regardless of environmental conditions during operation, as the bonding strength is determined by the fixed geometric pattern rather than variables like temperature or humidity that affect adhesive concentration.
3Ease of operation
If adhesive dots are sparsely distributed to enable easy detachment, then sheet detachment is easier, but bonding strength may be insufficient for secure holding during processing
Solution Approach 1:
The adhesive dots are asymmetrically distributed with higher density at corners and edges compared to the center area. This asymmetric pattern provides strong bonding at the periphery where the sheet can be gripped for detachment, while maintaining sufficient overall holding strength during processing. The corner and edge placement allows users to pull the sheet from these locations for easy removal without compromising the bonding strength needed during operation.
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 sheet holder effectively maintains sheet stability during processing and prevents wrinkling or curling after treatment, ensuring secure holding and easy detachment, even with tissue paper, by optimizing adhesive dot placement and density.
Implementation Method 1
a plurality of adhesive dot lines each formed of a plurality of adhesive dots which are formed on the upper surface of the base material
Data Source
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AI summary
A sheet holder is provided in which a sheet is held without deflection in a process treatment by a plotter and the sheet is easily detached thereafter. The sheet holder is used for holding the sheet during the process treatment on the sheet, and a plurality of circular adhesive dots are applied to a sheet-shaped base material. The adhesive dots each having a predetermined diameter are arranged at predetermined intervals in a diagonal grid pattern along a sheet feeding direction. Specifically, the adhesive dots are arranged side by side along the sheet feeding direction to form adhesive dot lines. The plural adhesive dot lines are formed to be arranged side by side in a carriage moving direction. Among two adjoining adhesive dot lines, formation positions of the respective adhesive dots in one adhesive dot line and in the other adhesive dot line are different in the feeding direction.