Slitter-Winder Nip-Adjacent Adhesive Application for Full-Speed Production
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Solution Overview
Problem
Existing adhesive application methods in slitter-winders require a decrease in running speed to accommodate fast-hardening adhesives, leading to capacity loss and inefficiency, especially in two-drum winders.
Innovation Solution
Adhesive application devices are positioned to apply adhesive close to the winding nip, with transverse movement over the fiber web, allowing for rapid application and use of fast-hardening adhesives without slowing down the process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If adhesive application is performed in conventional positions away from the winding nip, then the adhesive has sufficient time to set, but the running speed must be decreased leading to capacity loss
Solution Approach 1:
The adhesive application point is relocated from conventional positions (above or below the web) to a position in the winding nip region, utilizing the third dimension of space around the winding drum. This allows the adhesive to be applied where the web is already under compression and moving at full speed, eliminating the need to slow down while ensuring reliable bonding through the concentrated pressure in the nip region.
Solution Approach 2:
The invention changes the spatial parameter of adhesive application location from distant positions to a position within 1000 mm of the winding nip. This parameter change allows the adhesive to be applied when the web is moving at full production speed, and the concentrated pressure in the winding nip provides the necessary bonding conditions without requiring reduced running speed.
2Productivity
If adhesive is applied far from the winding nip, then application can be performed at full speed, but the adhesive does not have sufficient time to set before reaching the bonding point
Solution Approach 1:
The winding drum acts as an intermediary that concentrates pressure at the winding nip, providing the necessary bonding conditions for the adhesive. By applying the adhesive close to this pressure concentration point, the web receives both the adhesive and the bonding pressure simultaneously, eliminating the time delay that would occur with conventional application positions.
3Device complexity
If conventional adhesive application positioning is used, then equipment complexity is low, but two slitter-winders are needed to maintain capacity
Solution Approach 1:
The adhesive application device is positioned in the winding nip region around the drum, utilizing the circumferential space that is typically unused. This spatial reconfiguration allows single-point adhesive application at full web speed, enabling one slitter-winder to perform the work of two while adding minimal complexity to the existing winding mechanism.
Data Source
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AI summary
The invention relates to a method of applying adhesive in a slitter-winder, which slitter-winder comprises a winder (20) with at least one winding drum (10) for winding a fiber web (W) into a customer roll (15) by a winding nip (N) formed between the winding drum (10) and the customer roll (15), in which method at least one adhesive application device (31, 32) is adapted to apply adhesive on end of the fiber web (W), while the fiber web (W) is moving, for attaching the end of the fiber web (W) onto the customer roll (15), in which method the adhesive application device (31; 32) is moved in cross-direction of the running direction of the fiber web (W) over at least partial width of the fiber web webs on a support element (33; 34). In the method the adhesive is applied on the fiber web (W) at most 1000 mm before the adhesive on the fiber web (W) reaches the winding nip (N).