Web Slitter Suction System for Dust Extraction
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Solution Overview
Problem
Longitudinal cutting devices for material webs, such as paper or cardboard, face challenges in effectively removing cutting dust, which poses health risks and explosion hazards, and existing solutions do not adequately address these issues.
Innovation Solution
The implementation of a suction collection system with strategically designed suction pipes and sealing mechanisms, including a flexible yet stiff sealing tape and support grid, ensures comprehensive dust removal by utilizing the momentum of cut dust and maintaining effective sealing during knife movement and adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If circular knives are made movable to adjust cutting positions, then cutting flexibility is improved, but sealing difficulty increases
Solution Approach 1:
The patent employs a flexible sealing tape that can deform to accommodate the movement of circular knives. The sealing tape is tensioned and pressed against the knife carriage to maintain sealing contact despite positional adjustments, thereby enabling adaptive cutting positions while managing sealing complexity through material flexibility rather than rigid mechanical sealing structures.
2Productivity
If suction pipes are positioned to capture cutting dust, then dust removal efficiency is improved, but device complexity increases
Solution Approach 1:
The suction pipes are integrated directly into the knife carriage structure, merging the dust extraction function with the existing cutting mechanism. The suction openings are positioned at the knife carriage where cutting dust is generated, allowing simultaneous cutting and dust capture without adding separate, complex dust collection apparatus.
Solution Approach 2:
The suction system utilizes the natural momentum and direction of cutting dust generation to facilitate self-directed dust removal. The suction openings are strategically positioned to capture dust as it is produced, and the flexible sealing tape automatically maintains sealing contact during knife movement, enabling the system to service itself without additional complex control mechanisms.
3Adaptability or versatility
If sealing tape is made flexible to accommodate knife movement, then sealing adaptability is improved, but dust leakage risk increases
Solution Approach 1:
The sealing tape is designed with controlled flexibility, being more flexible in the transverse direction to accommodate knife movement while maintaining sufficient stiffness in the longitudinal direction to prevent dust leakage. This anisotropic flexibility property allows the tape to adapt to positional changes while preserving sealing effectiveness.
Solution Approach 2:
The sealing tape is pre-tensioned and positioned before knife movement occurs. The tensioning device maintains continuous pressure on the sealing tape against the knife carriage, ensuring that the sealing contact is established in advance and maintained throughout the knife's movement, thereby preventing dust leakage before it can occur.
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 solution enables efficient and safe removal of cutting dust, minimizing health risks and explosion hazards, while allowing for flexible adaptation to different cutting configurations and knife positions, enhancing the operational safety and efficiency of longitudinal cutting devices.
Implementation Method 1
a suction collection pipe (6) which extends transversely to the direction of travel (2) over all circular knives (3, 4) located in the track area, with at least one suction pipe (8) connected to each circular knife (3, 4)
Data Source
Figure 1~2
Figure 3~5
AI summary
The invention relates to a longitudinal cutting device for cutting a traveling material web (1), particularly a paper or cardboard web, having a plurality of rotatable circular knives (3, 4), which cut in the direction (2) of web travel, each being adjustably mounted via a slide (5) on a knife traverse extending crosswise to the web travel direction (2). According to the invention, the discharge of cutting dust is improved in that a suction collection pipe (6), connected to a vacuum source, extends crosswise to the web travel direction (2) over a plurality of circular knives (3, 4), said suction collection pipe having a suction slot (7) extending crosswise to the web travel direction (2) over said circular knives (3, 4), a suction pipe (8) receiving the cutting dust being associated with each of said circular knives (3, 4), said suction pipes (8) each being connected to the suction collection pipe (6) via a coupling element (10) mounted in the suction slot (7) and the suction slot (7) being sealed between the coupling elements (10) via a sealing band (9).