Magnet paper is a combination of magnetized rubber and paper, and typically comes in letter-sized (A4) sheets for easy printing. This type of paper is very popular for short-term advertising and marketing efforts, instant magnet photos for the fridge, educational tools, business cards and so much more.
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The paper becomes magnetized because the elastic rubber or plastic on the back is embedded with magnetized strontium ferrite powder, or some other magnetized material. Basically, millions of tiny magnets create a flexible magnetic sheet! The thickness of the magnet designates its strength, but thicker types of magnet paper are more limited in terms of the printers that can handle their size.
These sheets work best when attached to a solid metal object, such as a refrigerator door or other metal surfaces. The material is also very pliable and easy to cut with a razor blade or scissors. You can create a number of different magnets, such as uniquely personalized name tags, without buying them in bulk from a traditional manufacturer of custom magnets.
Magnet paper can be matte or glossy, and is ideal for high-quality photos. The paper can be fed through most printers one sheet at a time, and the width of the paper tends to range from 15 millimeters to 60 millimeters. While many companies sell magnet paper in the same size as normal printer paper, there are other forms, such as larger rolls for large-format printing. You should always print on the highest possible quality to get the best results for your magnets.
While this is a very cool product that can lead to some awesome merchandise, there are some clear downsides. Due to the materials involved in magnet paper, it is not safe to use it in laser printers. Inkjet printers are quite common, but there are some older models that still generate a decent amount of heat, and may not be ideal for printing on this material.
If the printing tray doesn’t push out flat, it could cause deformations in the image being printed, and this paper (once printed), should not be exposed to water or excess sunlight. While the material won’t rust, the exposure to UV rays can make the material brittle, which could compromise its magnetic hold.
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Furthermore, in terms of convenience, using magnet paper on any sort of large print order isn’t very efficient. The sheets can only be loaded into the printer one at a time, or else the sheets would stick together and load improperly.
Printers also tend to heat up when used for extended periods, which adds to the risk of using an old printer. Some types of printers use electromagnets to operate the machinery, and this can lead to printing disasters with magnetized paper. Similarly, ferrous materials in the printer itself may attach to the paper and not let it pass through the machine. Checking your printer and doing your due diligence online before using magnet paper is a wise move.
Laminating (LOM) is one of the first additive manufacturing techniques created and uses a variety of sheet material, namely paper. Benefits include the use of A4 paper, which is readily available and inexpensive, as well as a relatively simple and inexpensive setup, when compared to others.
The Ultrasonic Additive Manufacturing (UAM) process uses sheets of metal, which are bound together using ultrasonic welding. The process does require additional CNC machining of the unbound metal. Unlike LOM, the metal cannot be easily removed by hand and unwanted material must be removed by machining. Material saving metallic tape of 0.150mm thick and 25mm wide does however, result in less material to cut off afterwards. Milling can happen after each layer is added or after the entire process. Metals used include aluminium, copper, stainless steel and titanium. The process is low temperature and allows for internal geometries to be created. One key advantage is that the process can bond different materials and requires relatively little energy as the metal is not melted, instead using a combination of ultrasonic frequency and pressure (The Engineer, ). Overhangins can be built and main advantage of embedding electronics and wiring (Karunakaran et al., ). Materials are bonded and helped by plastic deformation of the metals. Plastic deformation allows more contact between surface and backs up existing bonds (Janaki Ram et al., ).
Post processing requires the extraction of the part from the surrounding sheet material. With LOM, cross hatching is used to make this process easier, but as paper is used, the process does not require any specialist tools and is time efficient. Whilst the structural quality of parts is limited, adding adhesive, paint and sanding can improve the appearance, as well as further machining.
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