Web Adhesive Application Device Scraping and Damming Mechanism
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Solution Overview
Problem
Existing adhesive application devices for corrugated cardboard sheets face challenges in preventing adhesive liquid extrusion at the ends, leading to damage and inefficiencies due to high-speed rotation and viscous forces.
Innovation Solution
A web adhesive application device with a scraping member and damming member that pressure-contact the adhesive application roller to remove excess adhesive and prevent extrusion, utilizing a doctor roller to adjust adhesive thickness and ensure precise application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the adhesive application roller rotates at high speed to increase productivity, then the productivity is improved, but the adhesive liquid is extruded from the adhesive application region due to centrifugal force
Solution Approach 1:
The patent extracts and removes the extruded adhesive liquid from the adhesive application region using a scraping member. The scraping member is positioned to scrape off adhesive liquid that has been extruded by the rotating adhesive application roller, preventing it from being applied to the web in incorrect locations.
Solution Approach 2:
The patent introduces a scraping member as an intermediary element between the adhesive application roller and the web. This scraping member acts as a mediator to remove excess adhesive liquid before it can be transferred to the web, thereby solving the extrusion problem while maintaining high-speed operation.
2Strength
If the adhesive liquid thickness is increased to ensure adequate bonding, then the bonding strength is improved, but the adhesive liquid wraps around the damming member and is extruded to the outside
Solution Approach 1:
The patent segments the adhesive control function into two distinct components: a damming member that controls adhesive thickness and a scraping member that removes excess adhesive. This segmentation allows the system to maintain adequate adhesive thickness for bonding while preventing wrapping and extrusion through the dedicated scraping function.
Solution Approach 2:
The patent applies local quality by positioning the scraping member at specific locations where adhesive extrusion occurs. The scraping member is placed downstream of the damming member to specifically address the extrusion problem in the adhesive application region without affecting the overall adhesive thickness needed for bonding.
3Area of stationary object
If the adhesive application width is increased to cover the entire web width, then the coverage is improved, but the adhesive liquid is applied outside the required region and causes damage
Solution Approach 1:
The patent extracts adhesive liquid from the adhesive application region using the scraping member. By positioning the scraping member to scrape off adhesive at the edges of the application region, the system prevents adhesive from being applied outside the required region, thereby eliminating the harmful effect while maintaining full required coverage.
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
Effectively prevents adhesive liquid extrusion, ensuring accurate application and reducing damage to the cardboard sheets during the manufacturing process.
Implementation Method 1
a scraping member that scrapes off the adhesive liquid, which is applied outside the adhesive application region, by coming into pressure contact with a surface of the adhesive application roller
Implementation Method 2
a damming member that dams the adhesive liquid, which is extruded from the adhesive application region, by coming into contact with the surface of the adhesive application roller
Implementation Method 3
a doctor roller that adjusts a thickness of the adhesive liquid applied to the adhesive application roller to a preset thickness
Data Source
AI summary
A web adhesive application device, adhesive application method, and the cardboard sheet manufacturing device are provided with: an adhesive liquid tank for storing an adhesive liquid; an adhesive application roll is configured for transferring the adhesive liquid to an adhesive application region adjusted according to a paper width of a bottom liner board to be glued together with a single face cardboard sheet; a doctor roller for adjusting the adhesive liquid to a set film thickness; scraping members in pressured contact with the surface of the adhesive application roll on the upstream side of the nip section with the doctor roller; and damming members in contact with the surface of the adhesive application roll on the upstream side of the nip section with the doctor roller in the rotation direction and on the downstream side of the scraping member contact positions in the rotation direction.