Flying Splice Adhesive Tape Deactivated Zone Splitting
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Solution Overview
Problem
The existing adhesive tapes used in flying roll changes of flat web materials do not ensure a controlled and defined splitting at the predetermined breaking surface, leading to potential web tears and inefficient unwinding during the replacement process.
Innovation Solution
The adhesive tape features a second layer of adhesive with a deactivated adhesive region facing the backing layer, creating an overhang at the breaking surface that initiates splitting in a targeted manner, reducing the force required for splitting and preventing premature opening due to centrifugal and aerodynamic forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the adhesive tape uses a uniform adhesive structure without deactivated areas, then the adhesive bond is strong across the entire surface, but the splitting behavior at the predetermined breaking point is uncontrolled and may cause web tears
Solution Approach 1:
The patent applies local quality by creating a deactivated adhesive area with different properties (reduced or eliminated adhesion) at the predetermined breaking point, while maintaining full adhesive strength in other areas. This localized modification enables controlled splitting initiation at the deactivated area without compromising the overall adhesive bond strength, resolving the contradiction between reliable splitting control and ease of operation.
2Strength
If the second adhesive layer is fully activated across its surface, then maximum bonding strength is achieved, but premature opening may occur due to centrifugal and aerodynamic forces during high-speed operation
Solution Approach 1:
The deactivated adhesive area creates a localized reduction in bonding strength that prevents premature opening at critical locations during high-speed operation. By strategically placing the deactivated area, the patent maintains strong bonding where needed while creating a controlled weakness that prevents uncontrolled premature separation under centrifugal and aerodynamic loads.
Solution Approach 2:
The deactivated adhesive area is pre-configured in the adhesive tape structure before use, creating a predetermined splitting initiation zone. This preliminary action ensures that when splitting is needed, it occurs at the predefined location rather than randomly due to centrifugal or aerodynamic forces, thereby preventing premature opening while maintaining overall bond strength.
3Ease of manufacture
If the adhesive tape structure is simplified without a surface coating, then manufacturing is easier and cost is reduced, but web tearing risk increases due to exposed adhesive
Solution Approach 1:
The surface coating is applied locally at the predetermined breaking point rather than across the entire adhesive surface. This localized coating provides protection where web tearing risk is highest (at the breaking point) while minimizing the complexity and cost associated with full-surface coating. The deactivated adhesive area works in conjunction with the localized coating to prevent web tearing without requiring manufacturing complexity throughout the entire tape structure.
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 configuration enhances the splitting behavior at the breaking surface, ensuring safer and gentler separation, reducing the risk of web tears and maintaining the web material's integrity during the flying roll change process.
Implementation Method 1
a second adhesive layer arranged on at least one area of the second surface of the carrier layer, and at least one predetermined breaking surface for splitting the adhesive tape, wherein the predetermined breaking surface is designed such that the at least one area has a surface coating arranged between the carrier layer and the second adhesive layer, wherein the adhesive forces of the second adhesive layer to the surface coating are greater than the adhesive forces of the surface coating to the carrier layer
Data Source
Figure 1
Figure 2
Figure 3a~3b
AI summary
The invention relates to an adhesive tape (K) for the flying roll change of flat web material (RB) wound on rolls (R; B), comprising a carrier layer (K3) having a first surface (K31) and a second surface (K32) opposite the first surface (K31), a first adhesive layer (K1) which is arranged directly or indirectly at least partially on the first surface (K31) of the carrier layer (K3), a second adhesive layer (K2) which is arranged on at least one surface area (FB) of the second surface (K32) of the carrier layer (K3), and at least one predetermined breaking surface for splitting the adhesive tape (K) over a surface, wherein the predetermined breaking surface is designed such that the at least one surface area (FB) has a surface coating (K4) which is arranged between the carrier layer (K3) and the second adhesive layer (K2).wherein the adhesive forces of the second adhesive layer (K2) to the surface coating (K4) are greater than the adhesive forces of the surface coating (K4) to the substrate (K3), and/or wherein the adhesive forces of the second adhesive layer (K2) to the surface coating (K4) are greater than the cohesive forces within the surface coating (K4), wherein the second adhesive layer (K2) has a deactivated adhesive area (K6) on a surface (K21) facing towards the substrate (K3).