Embossing Foil Transfer Layer Notching for Clean Separation
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Solution Overview
Problem
Existing methods for applying embossing foils with strongly crosslinking coating systems or high layer thicknesses fail to achieve clean separation edges during embossing, leading to unwanted contamination and increased production rejects due to the formation of flakes from the transfer layer.
Innovation Solution
The method involves punching linear notches into the transfer layer as predetermined breaking points, which act as mechanical stress points to facilitate clean separation of decorative sections from the carrier foil without damaging the carrier, using a roll-to-roll process that avoids thermal or chemical stress and pollutant emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If strongly crosslinking coating systems or high layer thickness embossing foils are used, then the decorative effect and durability are improved, but clean separation during embossing cannot be achieved leading to flake formation and contamination
Solution Approach 1:
Linear notches are punched into the transfer layer before embossing to pre-determine the breaking points. This preliminary action ensures that during subsequent embossing and separation, the transfer layer will break cleanly at these predetermined locations rather than forming flakes, thus resolving the contradiction between maintaining strong crosslinked coating systems and achieving clean separation edges.
2Stability of the object's composition
If traditional embossing methods are used with strongly crosslinked paints, then the coating stability is improved, but the paint breaks in undefined manner forming flakes that contaminate machines
Solution Approach 1:
The transfer layer is segmented by punching linear notches that create predetermined breaking points. This segmentation divides the potentially harmful continuous transfer layer into controlled segments that will break cleanly at the notched locations during embossing, preventing undefined breaking and flake formation while maintaining the stable crosslinked coating composition.
3Manufacturing precision
If laser radiation is used to remove decorative layer around embossing area, then separation is achieved, but thermal stress and pollutant emissions occur
Solution Approach 1:
The patent replaces the thermal laser radiation method with a mechanical punching method to create linear notches in the transfer layer. This mechanical approach achieves the same separation precision without generating thermal stress or pollutant emissions, thus resolving the contradiction between achieving clean separation and avoiding harmful thermal effects.
4Ease of operation
If deep notch structures are produced during replication, then separation is facilitated, but the carrier around the lacquer package is weakened during production
Solution Approach 1:
The linear notches are punched only in the transfer layer with specific depth control to create local breaking points, while the carrier film maintains its full thickness and strength in the surrounding areas. This localized modification facilitates separation at the notch locations without weakening the overall carrier structure, resolving the contradiction between ease of separation and carrier strength.
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 enables clean and reliable separation of decorative sections from the carrier foil, reducing contamination and production rejects, while maintaining the mechanical stability of the carrier layer and minimizing environmental impact.
Implementation Method 1
punched into the transfer layer (13) linear notches (15) which form predetermined breaking points for the transfer layer (13) in order to form high stresses in the material of the transfer layer (13) in the notched area
Data Source
Figure 1~2
Figure 3~4b
Figure 5a~5b
AI summary
The invention relates to a method for transferring a decorative section (16) of an embossing foil (1) to a substrate (23) by means of an embossing roller (24), an embossing stamp (24'), or an applied adhesive layer (14). The embossing foil (1) comprises a carrier foil (11) and a transfer layer (13) arranged on the carrier foil (11). The method comprises providing the embossing foil (1), stamping at least one linear notch (15) arranged at a distance from the edge of the decorative section (16) into the transfer layer (13), embossing the decorative section (16) onto the substrate (23), and detaching the remaining embossing foil from the substrate (25) embossed with the decorative section (16).