Label Printer Transport Roller Antiadhesion and Reverse Separation
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Solution Overview
Problem
The challenge is to ensure reliable operation of a printing system for strip-shaped media with self-adhesive coating, which tends to adhere to transport rollers, especially after prolonged shutdowns, requiring additional measures to prevent wrapping and ensure separation for efficient label production.
Innovation Solution
Implementing a reverse transport method where the medium is transported back in the opposite direction before each interval, combined with a shape behavior that allows separation from the transport roller, and using antiadhesive coatings on contact surfaces to facilitate reliable detachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of stationary object
If the medium is transported through the printing unit with the self-adhesive surface exposed, then space consumption is reduced and liner strip costs are eliminated, but the medium tends to wrap around the transport roller and get permanently stuck
Solution Approach 1:
The transport roller is pre-coated with an antiadhesive coating before the medium arrives, creating a non-stick surface that prevents the self-adhesive medium from wrapping around the roller. This preliminary protective measure eliminates the harmful adhesion effect before it can occur during transport.
Solution Approach 2:
An antiadhesive coating is introduced as an intermediary layer between the self-adhesive medium and the transport roller. This coating acts as a mediator that allows the medium to be transported without directly adhering to the roller surface, preventing wrapping while maintaining transport functionality.
2Reliability
If the transport roller surface is made antiadhesive, then medium separation is improved, but additional coating application and maintenance are required
Solution Approach 1:
The transport roller is designed with an inherently antiadhesive surface property that maintains its non-stick characteristics without requiring external maintenance or reapplication. The roller serves itself by naturally preventing adhesion through its material properties or permanent coating, eliminating the need for periodic servicing.
3Reliability
If the medium is transported back in the opposite direction, then adhesion between medium and transport roller is reduced, but the transport cycle time increases
Solution Approach 1:
Instead of implementing a complete reverse transport cycle, only a partial reverse action is applied - transporting the medium back a short distance just enough to break the adhesion bond with the transport roller. This excessive minimal action is sufficient to achieve separation without the time penalty of a full reverse transport cycle.
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 enhances operational reliability by ensuring consistent separation of the medium from the transport roller, maintaining tension and preventing wrapping, even with worn rollers, thereby improving the efficiency and simplicity of the printing process.
Implementation Method 1
the strip-shaped medium, which is usually a paper suitable for thermal printing, has a tendency to follow after, i.e., wrap around, the transport roller with which its surface with the self-adhesive coating is engaged
Implementation Method 2
this problem is dealt with by providing the transport roller and other surfaces that come into contact with the self-adhesive coating during the printing operation, with an antiadhesive coating
Data Source
AI summary
A method and device for improving the handling, in a label printer, of labels without a carrier strip operates by reversing the direction of transport of the label medium for a short distance before transporting the medium in the printing direction, allowing the label strip to reliably detach from a transport roller (10) that is used to guide the label strip through the printer.