Resin application device for a conveying surface in a printing process, assembly for preparing a conveying surface to receive a substrate in a printing process, method of preparing a conveying surface to receive a substrate in a printing process and method of printing a substrate
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Solution Overview
Problem
Inkjet textile printing is compromised by localized planarity defects caused by adhesive resin stagnation and impurities accumulating at the doctor blade, leading to uneven resin layers on the conveyor belt, which affect substrate positioning and printing quality.
Innovation Solution
A resin application device with a rotatably mounted dragging body that displaces adhesive resin from a first region to a second region upstream, forming a recirculation zone to prevent stagnation and impurities, ensuring a continuous, even resin layer on the conveyor belt.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If adhesive resin is delivered onto the conveyor belt surface while the belt is advanced, then the resin can be applied continuously, but the resin tends to accumulate and stagnate in front of the doctor blade, creating localized planarity defects
Solution Approach 1:
The patent introduces a dragging body that moves in the opposite direction to the conveyor belt advancement, creating a recirculation flow that prevents resin stagnation. This reverse motion counteracts the natural accumulation tendency and maintains uniform resin distribution across the belt surface.
Solution Approach 2:
The dragging body acts as an intermediary element between the resin delivery system and the conveyor belt. It mediates the resin flow by creating a recirculation zone that prevents direct stagnation at the doctor blade, thereby maintaining resin layer evenness while enabling continuous application.
2Area of stationary object
If adhesive resin is applied in excess to ensure complete coverage, then the doctor blade can spread the resin along the entire width, but impurities accumulate at the doctor blade and create grooves in the resin layer
Solution Approach 1:
The dragging body extracts impurities from the resin flow by creating a recirculation zone. As resin circulates between the dragging body and the conveyor belt, impurities are separated and prevented from accumulating at the doctor blade, thereby eliminating groove formation while maintaining complete coverage.
Solution Approach 2:
The patent converts the potentially harmful effect of excess resin (which could carry impurities) into a beneficial recirculation flow. The excessive resin creates a sufficient volume for recirculation, which in turn enables effective impurity removal and maintains resin layer quality.
3Productivity
If the conveyor belt is circulated to apply resin continuously, then productivity is improved, but overlapping layers of resin accumulate and require deep-washing and complete removal
Solution Approach 1:
The dragging body creates a continuous recirculation zone that maintains resin flow dynamics throughout the application process. This continuous motion prevents resin from setting in place and forming thick overlapping layers, thereby reducing the frequency and duration of deep-washing operations.
Solution Approach 2:
The system introduces dynamic motion through the dragging body, which continuously moves resin in a recirculation pattern. This dynamic action prevents the static accumulation of overlapping resin layers that would otherwise require time-consuming removal, thereby reducing downtime while maintaining continuous application.
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 solution maintains resin layer evenness, preventing impurities from compromising the printing process and ensuring precise substrate positioning and high-quality inkjet printing.
Implementation Method 1
The adhesive resin is delivered onto the surface of the conveyor belt in a liquid and viscous state
Implementation Method 2
The resin applied on the conveyor belt in a liquid and viscous state solidifies by evaporation of solvents
Implementation Method 3
The applied resin layer can be subsequently activated, for example by heating the adhesive resin, so as to prepare the surface of the conveyor belt to receive and retain the substrate
Data Source
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AI summary
A resin application device (100) for a conveying surface (16) in a printing process comprises: an adhesive resin dispenser (170) configured to deliver adhesive resin (180) onto a conveying surface (16); a dragging body (150) rotatably mounted about a rotation axis (R) and configured to come into contact with the conveying surface (16), wherein in a contact zone (156) between the dragging body (150) and the conveying surface (16), the dragging body (150) and the conveying surface (16) have respective advancement directions directed in opposite to each other; a motor (155) connected to said dragging body (150) for setting into rotation said dragging body (150) about said rotation axis (R); a support frame (101) on which said dragging body (150) is mounted and configured to be mounted on the conveying surface (16).