Laser Perforation for Bag Web Production
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing bag production devices face downtime and storage challenges due to the need for frequent knife adjustments and wear issues with perforating knives, and complex adjustments are required for laser beam devices to accommodate different web widths and contours.
Innovation Solution
A device using a highly coherent and focused laser beam with adjustable mirrors and web guiding/deflection systems that allow for variable perforation contours without the need for knives, enabling efficient processing of webs of different widths by adjusting the position and angle of the laser beam relative to the web, and maintaining web tension to ensure precise cuts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If perforating knives are used for creating perforations, then the perforation process is simple and direct, but the machine experiences downtime during knife adjustments and replacements, and storage space is required for multiple knife types
Solution Approach 1:
The patent replaces the mechanical knife-based perforation system with a laser beam device. The laser beam creates perforations through thermal ablation of the web material, eliminating the need for physical knives and their associated holders. This substitution removes wear issues and downtime for knife changes while maintaining the core perforation function.
Solution Approach 2:
The patent changes the fundamental parameter of the perforation process from mechanical cutting to optical/thermal processing. By using a laser beam with controllable intensity, focus, and scanning patterns, the system can create various perforation contours without changing physical components, thus eliminating the need for storage and adjustment of multiple knife types.
2Adaptability or versatility
If the web width varies, then the laser beam device must be adjusted to cover the entire width, but this requires complicated and expensive structures
Solution Approach 1:
The patent introduces dynamic adjustment capabilities for the laser beam device, allowing the beam position and angle to be varied in real-time according to the web width and desired perforation contour. This dynamic adaptability eliminates the need for complex mechanical reconfiguration structures, as the system can electronically and optically adjust to different conditions.
Solution Approach 2:
The laser beam device is designed to perform multiple functions: it can create different perforation contours, accommodate various web widths, and adjust to different material types. This multi-functionality is achieved through programmable control and optical scanning mechanisms rather than through multiple specialized components, reducing overall device complexity.
3Area of stationary object
If the laser beam distance from the web is increased to cover wider webs, then the beam coverage area increases, but the beam focus and energy transfer efficiency decrease
Solution Approach 1:
The patent uses periodic scanning of the laser beam across the web width rather than illuminating the entire width simultaneously. The beam rapidly moves back and forth (scans) across the material, creating perforations through repeated passes. This periodic action allows the beam to maintain focus and high energy density at any given point while still covering the entire web width over time.
Solution Approach 2:
The patent adds the time dimension to the laser beam application process. Instead of requiring the beam to cover the entire web width at once (spatial approach), the system uses temporal scanning to sequentially treat different areas. This transforms a spatial coverage problem into a temporal process, maintaining beam focus and energy efficiency while achieving complete web coverage.
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 solution reduces downtime and storage needs, allows for more varied perforation designs, and enhances the stability and appearance of produced bags, particularly when using film components, by eliminating the need for knives and minimizing wear on components.
Implementation Method 1
A laser beam device (35) is provided with which at least one laser beam (39) can be guided onto the web (3) for introducing the perforations
Implementation Method 2
a small path distance is desirable because the beam is better focused and the radiant energy can therefore be transferred more efficiently
Data Source
Figure 1~2
Figure 3~4
Figure 5a~6b
AI summary
The invention relates to an apparatus (1) for producing tubular sections that substantially comprise paper, for manufacturing bags. Said apparatus (1) comprises at least one unwinding device (2) which can be used to unwind a web (3), especially a paper web, from a roll, a perforation device (6) which can be used to make at least perforations in the web (3), said perforations extending across the web (3) at a right angle to the direction of transport (z) thereof, a tube forming device (9) which is located downstream in the cycle of production of the at least one perforation device (6) and which can be used to place the edges of the web (3) one on top of the other forming a tube (10), and a separation device which can be used to tear individual tubular sections (12) off from the tube (10) along the perforation. The perforation device (6) comprises at least one laser beam device (35) which can be used to direct at least one laser beam (39) onto the web (3) to make the perforations.