Intermediate Web Adhesive Transfer for Short Patches
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Solution Overview
Problem
Conventional adhesive application systems limit production speed when applying short adhesive patches in the machine direction on high-speed running webs, as they require minimum valve open times that result in longer adhesive application, making it difficult to achieve precise and efficient adhesive placement on fast-moving webs.
Innovation Solution
The method involves using an intermediate web layer processed through a traditional cut slip applicator for intermittent adhesive application, allowing for reliable performance with shorter on/off times, and applying a continuous adhesive pattern to the chassis web, enabling faster machine process speeds and complex adhesive patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional hot melt adhesive application systems are used with minimum valve open time of 4ms to 5ms, then reliable adhesive application is achieved, but production speed is limited and adhesive patch length increases on fast-moving webs
Solution Approach 1:
The patent introduces an intermediate carrier web that receives the adhesive application before transferring it to the final product web. This intermediary allows the adhesive to be applied at lower speeds with precise control, then transferred to the high-speed running web, effectively decoupling the adhesive application speed from the web production speed.
Solution Approach 2:
The process is divided into separate stages: adhesive application on the carrier web, then transfer to the product web. This segmentation allows each stage to operate at optimal speeds - the adhesive application at controlled lower speeds for precision, and the web production at high speeds for productivity.
2Manufacturing precision
If valve open time is reduced to achieve shorter adhesive patches on high-speed webs, then adhesive patch length is controlled, but valve response time becomes insufficient and application reliability decreases
Solution Approach 1:
The intermediate carrier web serves as a mediator that allows adhesive application to occur at optimized speeds rather than being constrained by the high speed of the final web. This enables sufficient valve open time for reliable application while achieving short adhesive patches on the final high-speed web through the transfer process.
Solution Approach 2:
The patent adds a temporal dimension to the solution by separating when the adhesive is applied (at lower speed with adequate valve time) from when it is transferred to the final web (at high speed). This dimensional separation resolves the conflict between valve response time requirements and web speed requirements.
3Productivity
If web speed is increased to improve productivity, then production efficiency increases, but adhesive patch length becomes too long for the desired application
Solution Approach 1:
The intermediate carrier web allows the system to achieve both high web speed and short adhesive patches. The adhesive is applied to the carrier web at controlled speeds, then the carrier web is transferred to the high-speed product web, maintaining the short adhesive patch length while enabling high overall production speed.
Solution Approach 2:
The adhesive application is performed in advance on the intermediate carrier web at optimized conditions, before the final high-speed transfer to the product web. This preliminary action at lower speed ensures precise adhesive patch length control, which is then preserved during the high-speed transfer.
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 approach allows for faster production speeds and precise adhesive placement, enabling the creation of short adhesive patches on high-speed webs, including complex patterns, while maintaining reliable performance and masking adhesives for concealment.
Implementation Method 1
adhesives are often used to couple different woven, non-woven, or elastic components together
Implementation Method 2
an intermediate web is provided, which could serve as one of the layers of a tri-laminate, which receives an intermittent adhesive application, and is processed through a traditional cut slip applicator
Implementation Method 3
applying a continuous adhesive pattern to the chassis web
Data Source
Figure 1~2
Figure 3A~3C
Figure 3D~3E
AI summary
Apparatus and methods are provided to allow for short length adhesive application in the machine direction. These short length adhesive applications can be used in creation of pocket style rear waistband feces containment features onto running webs for use in diaper manufacturing. Different configurations of adhesive and patch applications can be employed to create the pockets.