Laser Cutting Drum Venting for Uniform Continuous Strip Profiles
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Solution Overview
Problem
Existing laser cutting devices for continuous strips in personal hygiene product manufacturing suffer from increased dimensions due to smoke extraction ports, leading to inefficient smoke removal and irregular cut profiles caused by smoke condensation, especially at the portion of the strip in contact with the mantle.
Innovation Solution
A device with a rotating drum featuring through holes or a mesh structure to create a partial vacuum for smoke extraction and a blower element to direct a gas flow at the cutting area, ensuring uniform smoke removal across the strip without increasing device dimensions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If smoke extraction ports are positioned above the strip near the laser cutting head, then smoke can be removed from the cutting area, but the overall dimensions of the device are increased significantly and the space available for installation of the laser head is limited
Solution Approach 1:
Instead of extracting smoke from above the strip as in prior art, the invention inverts the approach by extracting smoke from below the strip through the rotating drum. The drum surface with through-holes or mesh structure allows smoke extraction ports to be positioned underneath the continuous strip, removing smoke at its source while maintaining a compact device footprint.
Solution Approach 2:
The smoke extraction system is nested within the rotating drum structure itself. The drum serves dual functions: conveying the strip and providing the extraction surface through its through-holes or mesh structure. This integration eliminates the need for separate extraction ports above the strip, reducing overall device dimensions.
2Object-generated harmful factors
If smoke extraction ports are positioned above the strip, then smoke can be extracted from the cutting area, but the smoke cannot be removed to sufficiently good effect from the portion of the strip in contact with the mantle
Solution Approach 1:
The invention extracts smoke from the opposite side (below) compared to prior art (above). This inversion allows uniform smoke removal from all portions of the strip including those in contact with the mantle, as the extraction occurs at the source before smoke can condense and form beads on the cut edges.
Solution Approach 2:
The rotating drum with through-holes or mesh structure serves as an intermediary extraction surface that enables uniform smoke removal across the entire strip width. This intermediate structure allows smoke to be extracted evenly from all areas, preventing localized bead formation and ensuring consistent cut profile quality.
3Ease of manufacture
If a laser beam is used for cutting, then low maintenance requirements and ease of control are achieved, but smoke is generated due to high temperatures causing bead formation on cut edges
Solution Approach 1:
The invention converts the harmful smoke generated by laser cutting into a manageable byproduct by extracting it at the source through the rotating drum. The high temperature laser cutting process is maintained for its manufacturing advantages, while the smoke extraction system converts the harmful thermal effect into controlled smoke removal, preventing bead formation.
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 allows for compact device design with effective smoke extraction and prevention of bead formation on cut edges, ensuring a smooth, uniform cut profile across the entire strip.
Implementation Method 1
a rotating drum, around which the strip is looped partially as it advances in a predetermined direction
Implementation Method 2
the cut made with a laser beam generates smoke as a result of the high temperatures induced locally at the cutting area
Implementation Method 3
a blower element to direct a gas flow at the cutting area, ensuring uniform smoke removal across the strip
Implementation Method 4
the cut made with a laser beam generates smoke as a result of the high temperatures induced locally at the cutting area
Implementation Method 5
an effect attributable substantially to sublimation of the strip material
Data Source
Figure 1
Figure 2
AI summary
A continuous strip (3) of material advancing along a given feed direction (A) is shaped by a device (1) that comprises a rotating drum (6a), around which the strip (3) is looped at least in part, and a laser cutting head (7). The laser head (7) operates from the side of the strip (3) opposite to the drum (6a), which is furnished internally with a first pressurized chamber (10a) able to generate an extracting or blowing action on smoke produced by the laser cutting process, and a second chamber (10b) adjacent to the first, by which scrap material cut from the strip (3) is detached and retained on the drum. Smoke produced by the laser cut is distanced from the strip (3) almost instantaneously by a blower (14) located between the cutting head (7) and the drum (6a), and thus prevented from condensing and hardening on the cut edge of the strip (3). The cutting head (7) is also equipped with scanning appliances (100) serving to deflect the laser beams (F) onto the cutting area, and positioned selectively by a control and setting device (9) incorporating dedicated software.