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<\/p>\nIs laser marking plastic safe? Is it efficient to mark on plastics?<\/p>\n
Plastic components are everywhere in modern manufacturing. Think about auto parts or medical devices, you need plastics for various uses. Even consumer electronics and household products rely heavily on plastic materials. In fact, many products we use every day contain plastic parts in one form or another.<\/p>\n
As you can realize, plastics are in very high demand. And manufacturers are constantly looking for ways to process it faster, more efficiently, and more effectively. In this case, one important step is marking. All companies need to add logos, serial numbers, or other codes to plastic parts.<\/p>\n
At first, marking plastic may seem simple. However, it can be more challenging than you think. Different plastics react differently to heat and light. Some plastics may melt, deform, or become discolored during the marking process.<\/p>\n
You can typically mark plastics in various ways. Some common methods include pad printing, screen printing, hot stamping, and laser marking. In this case, the real challenge is choosing the right method for your project. In this article, we will explore the challenges of marking plastics and the common methods used for marking them. You will learn why laser marking is often the preferred solution.<\/p>\n
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Unlike metals, plastics are much more challenging to mark. Different plastic materials react differently when exposed to laser energy. Some absorb the laser well, while others reflect it. The following five factors are the main reasons why plastics are challenging to mark.<\/p>\n
Laser marking plastic is quite challenging because of the pigments. Plastics use various types of organic and inorganic pigments for color. Pigment plays a crucial role in determining how a material absorbs laser light. Some of the pigment colors allow plastic to reflect a particular wavelength. Instead of changing color, laser bleach or scorch the pigments. As a result, marking becomes very hard for lasers.<\/p>\n
For multiple purposes, manufacturers use various types of fillers and additives. It improves overall strength and flexibility and often affects thermal stability. When you apply a laser to such plastic surfaces, fillers or additives might scatter the laser beam and cause uneven thermal distribution. This unusual behavior results in incomplete, rough, and patchy laser marks at the end. You won\u2019t get a uniform finish.<\/p>\n
Some plastics do not absorb laser light. When plastic surfaces come into contact with laser light, they either reflect or transmit it. Examples of these materials include acrylic, polycarbonate, and others that efficiently reflect or transmit laser light. This energy bouncing or passing makes the marking process harder, since it requires absorption for smooth marking. This lack of absorption also risks the melting of edge materials.<\/p>\n
Plastics are more sensitive to melting than metals. Laser marking plastics has lower melting points than metals. You can witness that its thermal tolerance is narrow. If the plastic is exposed to extreme laser heat, it may deform, melt, or char the surface, which makes the marking more difficult. On the other hand, if the provided energy is too low, it won\u2019t generate the desired marks. Balancing heat buildup is crucial here. Otherwise, the material will be destroyed or warped out.<\/p>\n
Plastic forms based on different polymer molecules. They may include PVC, polyethylene, ABS, and others. Each chemical form behaves differently under laser excitation. Some lasers can break down easily under a laser and form a dark mark. Others may not produce smooth marks but rather hazardous fumes or residues. So, a setting that works well on one plastic may not work smoothly on other plastics.<\/p>\n
There are many ways to mark plastic parts in manufacturing. Some methods create markings during molding, while others are applied after production. Each technique offers different levels of durability, cost, and appearance. Below are some of the most common methods for marking plastic without burning or damaging it.<\/p>\n
Molded-in marking is a process of marking different parts using the mold cavity. The marking is already engraved in the mold cavity. When you inject the material into it, the liquid takes the shape of the mold. After solidification, it forms the exact shape of the mold. There is no need for extra work after demolding. This process is highly suitable for the automotive, electronics, and medical sectors.<\/p>\n
Laser marking is one of the most widely used methods for marking various materials. Its flexibility allows it to mark both metals and non-metals. Laser marking on plastics is also a popular use case. When the laser beam encounters the surface, it produces microscopic bubbles. It chemically alters the surface to create a contrast mark.<\/p>\n