Void-Forming Polyolefin Films for High-Speed Laser Cutting
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Solution Overview
Problem
Laser cutting of polyolefin-based films, such as low density polyethylene (LDPE) and linear low density polyethylene (LLDPE), at high speeds is challenging due to limitations in achieving satisfactory cut quality and speed, particularly in absorbent article manufacturing where flexibility in cutting shapes is required.
Innovation Solution
Incorporating a film with a combination of absorbent filler particles (1-40% by weight) and void generating filler particles (10-40% by weight) that are different from each other, and stretching the film to create voids, which enhances laser cutting speed and edge quality when cut or perforated using a laser.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If laser cutting is performed on polyolefin-based films at high speeds, then productivity increases, but cut quality deteriorates
Solution Approach 1:
The patent modifies the physical and chemical parameters of the film by incorporating specific filler particles (such as metal oxides, carbon black, or organic pigments) that change the optical absorption properties of the polyolefin film. These parameter changes enable the film to absorb laser energy more effectively, allowing high-speed cutting while maintaining satisfactory cut edge quality that would otherwise be unachievable with standard polyolefin films.
Solution Approach 2:
The patent creates a composite material by combining polyolefin base material with filler particles (1-50 wt%, preferably 5-30 wt%). This composite structure integrates the advantages of both components: the polyolefin provides flexibility, processability, and liquid impermeability, while the filler particles enhance laser absorption. The synergistic combination enables the film to be cut at high speeds with good cut quality, resolving the contradiction between productivity and manufacturing precision.
2Productivity
If laser cutting speed is increased, then productivity improves, but energy consumption increases
Solution Approach 1:
By changing the optical absorption parameters of the film through filler particle incorporation, the patent enables more efficient energy utilization. The filler particles increase the absorption coefficient of the film, allowing the same cutting speed to be achieved with lower laser power, or higher cutting speeds to be achieved at the same energy input level.
Solution Approach 2:
The enhanced laser absorption properties allow the cutting process to complete more rapidly, reducing the total exposure time and overall energy consumption. The filler particles enable the laser energy to be absorbed and converted to heat more efficiently, 'rushing through' the heating and cutting process faster than would be possible with standard polyolefin films.
3Quantity of substance
If standard polyolefin films are used, then material cost is reduced, but laser cutting performance deteriorates
Solution Approach 1:
The patent develops a cost-effective composite by using relatively inexpensive filler particles (such as calcium carbonate, talc, or common pigments) that can be incorporated into polyolefin films at moderate concentrations (1-50 wt%). This composite approach maintains material cost at acceptable levels while dramatically improving laser cutting performance, achieving cutting speeds and quality that would be unattainable with pure polyolefin films.
Solution Approach 2:
By modifying the compositional parameters of the film to include filler particles, the patent achieves significant improvement in laser cutting performance without proportionally increasing material cost. The filler particles serve as cost-effective modifiers that change the thermal and optical properties of the film, enabling high-speed laser cutting while keeping overall material costs manageable.
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 method significantly increases laser cutting speed and improves the quality and softness of the cut edge, allowing for faster and more efficient cutting of films in absorbent articles, while maintaining control over cut edge aesthetics and comfort.
Implementation Method 1
directing a beam of light from the laser assembly upon the surface of the web with relative movement between the beam of light and the web to cut or perforate the web
Implementation Method 2
The method can include directing a beam of light from the laser assembly upon the surface of the web with relative movement between the beam of light and the web to cut or perforate the web
Implementation Method 3
The plurality of particles can include absorbent filler particles that provide about 1% to about 40% by weight of the film
Implementation Method 4
The plurality of particles can also include void generating filler particles that provide between about 10% to about 40% by weight of the film. The film can also include a plurality of voids.
Data Source
AI summary
Films and methods for cutting or perforating webs including films are disclosed. The films can include a polymer and a plurality of particles. The plurality of particles can include absorbent filler particles and void generating filler particles. The absorbent filler particles can provide between about 1% to about 40% by weight of the film. The void generating filler particles can provide between about 10% to about 40% by weight of the film. The absorbent filler particles can be a different particle than the void generating particles. The film can also include a plurality of voids.