Hot Stamping Web Transport Unit for Dimensional Stability
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Solution Overview
Problem
Existing methods for producing printed and hot-embossed material webs face challenges in achieving precise alignment of embossed and printed information due to mechanical instability and deformation of thermoplastic, duroplastic, or flowable substrates during the hot embossing process, leading to undesirable substrate inhomogeneities and web offset between printing and embossing.
Innovation Solution
A device and method that utilize a transport unit with deflection rollers and vacuum channels to maintain dimensional stability, combined with a narrowing embossing gap and synchronized printing and embossing processes, ensuring precise application of embossing and printing information by minimizing mechanical and thermal stresses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a material web is heated for hot embossing, then the material becomes embossable, but the material web becomes mechanically unstable and dimensionally changes
Solution Approach 1:
The patent applies parameter changes by controlling the temperature profile during hot embossing to maintain the material in a stable state. The heating is applied locally and temporarily to enable embossing without causing overall dimensional changes or mechanical instability of the material web.
2Ease of manufacture
If contact printing processes are used, then printing information can be applied, but the material web undergoes mechanical deformation and web offset occurs
Solution Approach 1:
The patent applies preliminary action by performing the printing process before the hot embossing process. The material web is printed first while in its stable, cool state, then heated and embossed subsequently. This sequence prevents printing deformation and web offset that would occur if printing were performed after heating.
3Device complexity
If the embossing gap is constant, then the embossing process is simple, but a bulge of flowable web material occurs at the entrance of the embossing gap
Solution Approach 1:
The patent applies dynamics by making the embossing gap variable rather than constant. The embossing gap is designed to be larger at the entrance to prevent bulging of flowable web material, and smaller at the exit to ensure proper embossing. This dynamic gap adjustment accommodates the flow behavior of heated thermoplastic materials.
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 enables the production of high-quality, precisely printed and embossed material webs with embossing and printing information accurately arranged in the micrometer range, reducing mechanical deformation and substrate inhomogeneities, and maintaining dimensional stability throughout the processing steps.
Implementation Method 1
the deflection roller (9) has vacuum channels (6) which penetrate the roller surface essentially radially and serve to provide the vacuum application at the interface between the material web and the roller surface
Implementation Method 2
a heating unit for providing a hot-embossable material web
Implementation Method 3
an embossing roller with an embossing structure (15) for embossing the heated web-shaped material (1) with the embossing structure (13)
Data Source
Figure 1
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AI summary
The invention relates to a device and method for producing printed and hot-stamped material webs having stamping and printing information arranged in an accurately fitting manner. A device according to the invention comprises a printing unit, a heating unit, a hot-stamping unit, and a transport unit, and is characterized in that the transport unit is in constant friction fit or form fit with the material web, at least until the printing unit, the heating unit, and the hot-stamping unit have acted on the material web. Accordingly, in the method according to the invention, the material web to be processed is retained in the friction closure or form closure with the transport unit preferably during the entire method process of the invention.