Laser Cutting Plastics 

Laser cutting has progressed to handle a wide variety of materials. These were once considered hard to cut. Nowadays, you can use desktop lasers to engrave or cut thin material sheets. But industrial machines can cut thick metals very quickly. To achieve the desired results, the correct laser type, power setting, feed rate, and ventilation are required for the operator’s safety. 

In this guide, we covered common laser cutting materials and advised getting the best results from your laser cutter.

What Materials Can be Laser Cut?

Here are the most commonly used metals for laser cutting service:

Acrylic (PMMA) Laser Cutting

PMMA(Acrylic) Laser Cutting

Acrylic is stiff, rigid and highly transparent. It usually comes in two forms: Cast acrylic and Extruded Acrylic. Cast acrylic is easily cuttable. While extruded sheets are susceptible to interior stress cracking. For clean edges, use low-powered CO2 or diode-pumped lasers. 

As an illustration, an 80 W laser may cut 8 mm acrylic at approximately 5 mm/s. Proper ventilation should always be maintained because acrylic fumes are toxic and combustible.

Metals Laser Cutting

Metal Sheet Laser Cutting

Metals require high power and careful planning, among other laser cut materials.  Most metals can be cut with fibre lasers, but CO2 lasers can only cut thin sheets. In general, two techniques are used for metal laser cutting.

• Reactive Cutting: This method speeds up the cutting process by oxidizing metals with oxygen. It is often applied to steel and titanium laser cutting.
• Fusion Cutting: It uses nitrogen or argon to blow out molten metal. It can be used on aluminium, stainless steel, and copper. With the right laser tune-ups, cuts are smooth, warping is less, and it's safe to use to produce laser cutting steel.

Plywood Laser Cutting

Bonded wood veneers are used to make plywood.  Laser cutting costs high in terms of power and feed rates, especially when there is more than one layer.  With the appropriate air blower pressure, you can get clean cuts and avoid burning. It is recommended to use CO2 and fibre lasers for cutting plywood.

MDF (Medium-Density Fibreboard) Laser Cutting

MDF is thick and has glue in it; it is harder to cut straight.  It needs a low feed rate and power to keep from burning and staining. A blower helps get rid of soot and other debris. It's essential to leave the cut clean and with as few areas affected by heat as possible.

Cardboard Laser Cutting

Cardboard is light and easy to cut.  The optimal power level is low to medium when the feed rate is high. To keep the edges smooth and the material from lifting off, the blower pressure should be low. It is recommended to provide ventilation, although the fumes are minimal. It is recommended to provide ventilation, although the fumes are minimal.

PolyOxyMethylene (POM) or Delrin(r)

POM is among the durable materials to laser cut commonly used for making machine parts. It is best cut using a CO2 laser. It requires low to moderate power and moderate blower pressure to avoid overheating.

Foam Laser Cutting

EVA, Depron, Gatorfoam, and polystyrene are common types of laser-cut foam.  These require low feed rates and power. Proper ventilation is needed, and you must wear a breathing mask because it produces toxic gases. Use low blower pressure to make sure that no thin foam sheets move around.

Leather Laser Cutting

Leather is strong and stretchy.  CO2 lasers give the best results for leather.  You may need to make several passes on thicker leather, but the cuts won't tear. The right environment stops stress from getting distorted, which can happen when you cut manually.

Plastics Laser Cutting

There are different types of plastics:

• Polyimide (Kapton(r)) and polyester (Mylar(r)): Using CO2 or diode lasers, you can cut them easily.
• Polycarbonate: Easy to cut (up to 1 mm), but it can turn yellow or warp.
• Polystyrene: It cuts easily, gives off smoke and toxic fumes, and needs ventilation.

You can avoid damage by setting the right power, beam focus, and speed.

Cork Laser Cutting

You can easily cut cork sheets that are only 3 mm thick with moderate power and fast feed rates. For thicker sheets, you may need to make several passes.  The blower pressure should be high enough to make clean cuts, but not so high.

Laser Cutting Clothes

Cotton, Silk, and Wool are natural materials that respond to low to moderate power and a high feed rate. Keep the blower pressure low to avoid lifting the material. To keep the synthetic fabrics from melting or catching fire, they need to be calibrated.

Paper Laser Cutting

With low power and high feed rates, the paper cuts easily. However, heavier paper may require slower cutting. Laser cutting still produces clean, precise edges without damaging the paper.

How to Use a Laser Cutter Effectively for Laser Cutting Materials?

Here are useful tips for effectively cutting materials with a laser cutter.

• Prepare the machine for each material. Keep it clean, and follow safety rules.
• Adjust laser power and speed based on material type and thickness.
• There must be proper ventilation to remove dust, smoke, and fumes.
• Set the right blower pressure to remove debris without lifting thin sheets.
• First, test the laser cutter on scrap material.
• Maintain optics clean (lenses, mirrors, nozzles) for focus and cut quality.
• Laser cutters act differently with each material type. So, adjust settings for different materials.

End Notes!

Advanced laser cutters allow precise shaping of a wide range of materials, from plastics and wood to metals and leather. However, it’s important to know how each material behaves, its properties, the appropriate laser power, speed, and ventilation. This way ensures smooth cuts, minimal heat damage, and consistent outcomes.