Coating Die Pressing Module Positioning for Pressure Consistency
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Solution Overview
Problem
Conventional coating apparatuses face challenges in positioning the die pressing module of the bending device immediately below the discharge port due to the separation of the front and rear parts of the die, leading to inconsistencies in coating pressure and interval between the backup roll and the die.
Innovation Solution
The coating apparatus design includes a die with a base module, a first body, and a second body, where a shim is sandwiched between them, allowing the die pressing module to be positioned on the base module's lower surface immediately below the discharge port, ensuring consistent coating pressure and interval management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the die is separated into front and rear parts with a discharge port in the separation part, then the die structure is more adaptable for coating, but the die pressing module cannot be disposed immediately below the discharge port
Solution Approach 1:
A pressing module is introduced as an intermediary component between the discharge port and the die pressing mechanism. This pressing module can press the lower surface of the die from below, effectively transmitting the pressing force to the die at the location immediately below the discharge port without requiring direct mechanical connection from the sides
Solution Approach 2:
Instead of pressing the die from the sides or top, the pressing force is applied from below the die through the pressing module. This inverted approach allows the die pressing module to be positioned immediately below the discharge port, solving the positioning problem caused by the separated die structure
2Stress or pressure
If the interval between the backup roll and the tip of the die is increased by coating liquid pressure, then coating pressure is improved, but the interval between the backup roll and the die becomes non-constant
Solution Approach 1:
The die pressing module applies a preliminary counteracting force to prevent the die from bending downward under coating liquid pressure. By pressing the lower surface of the die from below, it compensates for the interval increase caused by pressure, maintaining a constant interval between the backup roll and the die
Solution Approach 2:
The pressing force from the die pressing module is adjusted to dynamically compensate for changes in coating liquid pressure. By changing the pressing parameter, the system maintains a constant interval between the backup roll and the die even as coating pressure varies
Data Source
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AI summary
A coating apparatus (10) is described including a backup roll (12), a die (14) disposed below the backup roll, a bending device (8) disposed below the die, and a die pressing module (58) provided on an upper surface of the bending device. The die includes a base module (20), a first body (16) erected from a rear part of an upper surface of the base module, a second body (18) combined with a front surface of the first body, a mount space (44) formed between a front part of the upper surface of the base module and a lower surface of the second body, a liquid storage module (24) for a coating liquid, a liquid passage (44) for the coating liquid, a slit-like discharge port (42) for the coating liquid, and a shim (28) sandwiched between the first body and the second body.