Coreless Thermal Paper Roll with Breakaway Thin Tape
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Solution Overview
Problem
Coreless cash register paper rolls result in waste as the last section of thermal-sensitive paper cannot be fully used due to friction issues with the rotating shaft, leading to loss of thermal sensitivity.
Innovation Solution
A paper roll design incorporating a curl-resistant paper tape crimped into a cylinder shape, with a thin paper tape and thermal-sensitive paper tape stacked and wrapped around it, where the thin paper tape is designed to break easily, allowing the last section of the thermal-sensitive paper to be utilized fully by being pulled and separated from the curl-resistant tape.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If the cash register paper roll is made without a core, then the accumulation of cores as waste is reduced, but the last section of thermal-sensitive paper will enter into long-term friction with the rotating shaft and lose its thermal sensitivity
Solution Approach 1:
The paper roll is divided into two distinct parts: a thermal-sensitive paper tape and a curl-resistant paper tape. The thermal-sensitive paper is wrapped around the curl-resistant paper, which is crimped into a cylinder shape. This segmentation allows the thermal-sensitive paper to be separated from the core structure, enabling the last section to be fully used without friction damage.
Solution Approach 2:
The curl-resistant paper tape acts as an intermediary between the thermal-sensitive paper and the rotating shaft. It provides structural support and maintains the cylindrical shape without requiring a traditional core, while allowing the thermal-sensitive paper to be easily separated and fully utilized.
2Reliability
If the thermal-sensitive paper is spliced with the curl-resistant paper, then the thermal sensitivity is maintained, but the last section of the thermal-sensitive paper tape cannot be fully used, causing waste
Solution Approach 1:
The paper roll design incorporates a dynamic separation mechanism where the thermal-sensitive paper can be easily pulled away from the curl-resistant paper. The longitudinal tensile strength of the thin paper tape is controlled (between 1.96-7.84 kN/m) to allow it to break at an appropriate position, enabling the last section of thermal-sensitive paper to be fully used.
Solution Approach 2:
The invention controls the longitudinal tensile strength of the thin paper tape within a specific range (1.96-7.84 kN/m) to optimize its breaking behavior. This parameter control ensures the thin paper tape breaks at the right moment, allowing complete utilization of the thermal-sensitive paper without waste.
3Loss of substance
If a thin paper tape with low tensile strength is used, then the last section of thermal-sensitive paper can be fully utilized, but the structural integrity of the paper roll may be compromised
Solution Approach 1:
The paper roll uses a composite structure combining thermal-sensitive paper tape and curl-resistant paper tape with different properties. The curl-resistant paper provides structural integrity and maintains cylindrical shape, while the thermal-sensitive paper provides the printing function. This composite approach allows the thin paper to have low tensile strength for easy separation while the overall structure remains intact.
Solution Approach 2:
Different parts of the paper roll have different mechanical properties tailored to their specific functions. The curl-resistant paper has high strength and rigidity to maintain structure, while the thin paper tape has controlled low tensile strength to enable easy separation and full utilization of the thermal-sensitive paper.
Data Source
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AI summary
The present invention discloses a paper roll without core, comprising a curl-resistant paper tape, the curl-resistant paper tape being crimped into cylinder shape with an end, a thin paper tape, a front end of the thin paper tape is fixed with the end of the curl-resistant paper tape; and a thermal-sensitive paper tape, a front end of the thermal-sensitive paper tape is fixed with an end of the thin paper tape, and the thermal-sensitive paper tape is wrapped around an outer circumference of the curl-resistant paper tape. When the coreless paper roll is used till its end, the thin paper tape is not pressed or covered by the thermal-sensitive paper tape anymore, and can be pulled and broken in the cash register. So that the last section of the thermal-sensitive paper tape can break away from the curl-resistant paper tape and be used by the cash register. By this means, the thermal-sensitive paper tape is fully utilized.