Spindle-Free Folded Adhesive Web Dispensing for Consistent Tension
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Solution Overview
Problem
Existing web handling systems face challenges in efficiently dispensing adhesive tapes without splicing issues, controlling rotational speed, managing angular momentum, and ensuring consistent tension, often leading to waste and downtime due to tangling and splicing failures.
Innovation Solution
A folded adhesive web article is provided that is self-supporting and adhesive-free at room temperature, allowing for direct connection of webs without spindles, enabling controlled dispensing with consistent tension and reduced energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If adhesive tape is wound into a roll and dispensed by rotating the roll, then continuous web supply is achieved, but controlling rotational speed and managing angular momentum becomes difficult
Solution Approach 1:
The continuous roll is segmented into individual folded web articles, each capable of independent dispensing without rotational motion. This eliminates angular momentum issues while maintaining continuous supply capability through sequential dispensing of folded units.
Solution Approach 2:
Instead of rotating the web to dispense it, the patent inverts the approach by folding the web and dispensing it in a linear fashion. The dispensing mechanism pulls the web from the folded configuration rather than unwinding from rotation, fundamentally changing the motion paradigm.
2Duration of action of stationary object
If splicing is used to join rolls of web, then continuous web supply is maintained, but splicing equipment complexity and splicing failures increase
Solution Approach 1:
The web is pre-folded into a configuration that enables direct connection between units without requiring complex splicing equipment. The fold structure is prepared in advance during manufacturing, allowing simple mechanical connection at the fold points rather than requiring on-demand splicing operations.
Solution Approach 2:
The complex splicing operation is extracted and eliminated by designing the web with pre-formed fold points that enable direct connection. The problematic splicing step is removed from the process entirely, replaced by simpler mechanical attachment at predetermined fold locations.
3Stability of the object's composition
If adhesive web is folded over itself with adhesive surfaces in contact, then web stability is improved, but self-adhesion at room temperature causes unwanted bonding
Solution Approach 1:
The adhesive properties are changed as a function of temperature. The adhesive is formulated to remain non-tacky at room temperature for stable folded storage, then becomes activated and bonding-capable when heated during the dispensing process. This temperature-dependent parameter change resolves the contradiction between stability and bonding capability.
Solution Approach 2:
The adhesive exhibits different properties in different thermal environments. At storage temperature, the adhesive has low tackiness to prevent self-bonding and maintain stability. At dispensing temperature, the adhesive becomes active and provides the necessary bonding. This local quality variation in space and temperature resolves the contradiction.
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
The solution allows for seamless web dispensing without spindles, reducing tangling, waste, and downtime, while maintaining consistent tension and energy efficiency, and facilitating continuous web application without splicing complications.
Implementation Method 1
the adhesive layer is free of self-adhesion at room temperature
Implementation Method 2
the adhesive layer includes a hot melt adhesive
Data Source
AI summary
An adhesive web article including an adhesive web defining a first surface, a second surface, a first end, a second end, a length in between, and an adhesive layer defining a first adhesive surface. The adhesive web is folded over upon itself along the length such that a first portion of the first adhesive surface is in facing relationship with a second portion of the first adhesive surface.