Carrier-Free Adhesive Strand for Fibrous Web Connection
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Solution Overview
Problem
The existing methods for connecting the end of a running fibrous web to the beginning of an incoming fibrous web, such as in paper or cardboard rolls, are inefficient due to the need for adhesive tape, which results in high maintenance and personnel costs, limited adhesive supply, and increased thickness leading to disruptions in processing machines.
Innovation Solution
A method and device using a carrier-free adhesive applied in a strand pattern without a carrier medium, allowing for a cost-effective connection by dispensing adhesive directly onto the webs, reducing thickness, and enabling faster processing with minimal wear and tear, using a device with a movable nozzle and pressure roller for enhanced adhesion and curing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If adhesive tape is used to connect fibrous webs, then the connection is simple and reliable, but the adhesive supply is limited and maintenance costs are high
Solution Approach 1:
The invention extracts the adhesive from its carrier medium (tape), allowing the adhesive to be applied directly in liquid or paste form. This eliminates the limitation of adhesive supply being constrained by the physical length of the tape roll, enabling much longer continuous adhesive application for connecting multiple fibrous webs.
Solution Approach 2:
The invention introduces a dosing pump as an intermediary device between the adhesive storage and the application point. This mediator controls and meters the adhesive flow, ensuring precise application while enabling continuous supply from large adhesive reservoirs, thereby extending the effective adhesive supply beyond what tape could provide.
2Ease of operation
If adhesive tape is used for connection, then alignment is straightforward, but maintenance and personnel costs are high
Solution Approach 1:
The invention replaces the mechanical tape-based connection system with a liquid/paste adhesive application system. This substitution eliminates the need for tape rolls, unwind mechanisms, and precise tape alignment hardware, thereby reducing mechanical complexity and maintenance requirements while maintaining connection effectiveness.
Solution Approach 2:
The adhesive application system is designed to be self-regulating through the dosing pump, which automatically controls adhesive flow rates and application timing. This self-service capability reduces the need for manual intervention and monitoring, thereby lowering personnel costs and simplifying operation.
3Reliability
If adhesive tape is applied, then connection is achieved, but adhesive protrudes at edges requiring additional cutting
Solution Approach 1:
The invention applies adhesive locally only at the joint area where fibrous webs need connection, rather than applying tape across the entire web width. The dosing pump delivers adhesive precisely at the connection point, preventing edge protrusion and eliminating the need for additional cutting operations to trim excess adhesive or tape.
4Ease of operation
If adhesive tape is used, then connection is simple, but scrap costs are high due to unused adhesive
Solution Approach 1:
The dosing pump enables continuous adhesive application at the exact rate needed for each connection, eliminating the discontinuous nature of tape-based connections. This continuous, metered application ensures that adhesive is used efficiently without waste, as the pump can precisely control the amount dispensed based on the specific connection requirements.
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 provides a cost-effective, low-disruption connection between fibrous webs, allowing for longer adhesive supply, reduced maintenance, and improved processing efficiency by minimizing adhesive thickness and wear, while ensuring strong tensile forces are transferred through the adhesive strands.
Implementation Method 1
After application, the adhesive is preferably subjected to a pressure perpendicular to the surface of the fibrous webs. This can achieve two advantages. On the one hand, the connection between the adhesive and the surfaces of the fibrous webs is strengthened. On the other hand, the thickness with which the adhesive has been applied can be reduced.
Implementation Method 2
The pressure is preferably applied with the aid of a roller whose surface has a lower coefficient of static friction with respect to the adhesive than the surface of the fibrous webs. This means that the adhesive sticks to the surfaces of the fibrous webs and not to the roller.
Implementation Method 3
Curing acceleration is preferably carried out after the adhesive has been applied. This hardening acceleration can take place, for example, using UV radiation or cold.
Implementation Method 4
In particular when using hot glue, rapid cooling is advantageous in order to achieve rapid connection of the two fibrous webs.
Data Source
AI summary
The method involves connecting an opening (4) of a tapered fibrous web (5) with an end (2) of a running fibrous web (3) together. A carrier-free adhesive (10) is applied in the form of a strand (21) on a surface on the fibrous webs by an adhesive application device (12), where the strand covers the opening and the end of the webs. The adhesive is applied over breadth of the fibrous webs in regions of the webs, where the regions comprise different distances to longitudinal edges (18) of the fibrous webs, and the adhesive application device comprises a hardening acceleration device (24). The fibrous webs are made of paper or cardboard. An independent claim is also included for a device for connecting an end of a running fibrous web with an opening of a tapered fibrous web.