At present, more and more counterfeit plastic products appear on the market, which has become a topic of concern, and there are many kinds of counterfeit plastic products, from pharmaceutical packaging, medical equipment, sporting goods, electronic products to parts of automobiles and spacecraft. Not included. Counterfeit products cause economic losses to genuine brand manufacturers; damage the reputation of brand-name products, increase the cost of maintaining product reputation and quality assurance, and sometimes cause harm to consumers.
The product manufacturers and resin raw material manufacturers that are deeply affected by them are jointly seeking some product identification verification technology to solve the problem of product anti-counterfeiting identification. These anti-counterfeiting technologies include particle marking, identifiable pigments and dyes, radio frequency resolved labels, holographic patterns, and laser marking systems for making wear resistant etched bar codes.
1, particle identification
The purpose of developing miniature logos was to help track the source of explosives in the event of a *** incident, but today it is widely used to track and identify the authenticity of plastic products. The most typical particle identifications are those with a specific resolution function or polymeric particles containing a specific chemical composition which can be pre-mixed with the thermoplastic prior to molding. The diameter of the microparticles is less than 50 micrometers (corresponding to the size of the bacteria), and the large diameter is about 600 micrometers (corresponding to the size of the salt particles), which is not the same.
These microparticles are inert and usually do not react chemically and can withstand the high temperatures of the molding process without damage. By transforming the number, type and color of each particle, or changing the chemistry of the particle surface, millions of different coded blends can be produced. Since the resin contains coded particles, the manufacturer and product information can be identified with a special reading device.
The labeled particles are often pre-mixed with the plastic powder so that they can be used for molding or concentrated, and molded by dilution. The color strip micro-marking on plastic parts for injection molding, extrusion molding or rotational molding can be clearly discerned by scanning with a microscope or a pattern reader. Some manufacturers make the logo fluorescent or magnetic, so that the authenticity can be easily discerned with an ultraviolet illuminator or with a magnetic scanner.
2. Pigments and dye additives
Another way to identify whether a plastic part is from a factory is to mix plastic parts with pigments or dyes and analyze the exposed and UV areas with a spectrometer. The pigments or dyes will show a unique pattern. Even if the counterfeiters use extremely similar colors on their plastic products, they cannot obtain the same spectrum as the original.
Among the recently invented anti-counterfeiting technologies, one uses "discoloration" pigments. These additives contain a multi-layered polymeric light-reflective coating that is applied around a reflective aluminum chip to allow the color of the plastic to change with viewing angles. The change in color, such as from red to green, is due to the interference of light waves reflected from different pigment layers. Color-changing pigments give plastic consumer products a significant aesthetic effect, and because these effects are not easily cloned, they also have anti-counterfeiting capabilities.
Color-changing pigments can be mixed into a variety of resins, such as pc, pp, hdpe, pet, abs, thermoplastic pu, cellulose acetate, and pa12. The weight ratio of the color-changing pigment to the resin is usually between 0.2% and 0.4%, and can be processed by standard processes such as injection molding, extrusion blow molding, thermoforming, calendering, extrusion film, and in-mold decoration.
3, RF resolution / rfid label
Another method of identifying plastic parts is a radio frequency (rfid) tag, in which a micro tag that emits a radio signal is pre-set in a plastic part.
These signals containing the information encoded by the plastic parts are received by the radio receiver and forwarded to the relevant computer. The RF-resolved tag technology uses a miniature transmitter (radio transmitter) mounted on a semiconductor chip to store data. Most tags have both reading and input data. When the tag is powered, it is sensed by the electromagnetic field emitted by the radio receiver antenna, and the receiver can read the data on the tag.
Rfid labels are often affixed to plastic parts in the form of adhesive labels. But after a long time, these labels are easy to be removed. The latest rfid labels are embedded in plastic parts during the injection molding process. The most common practice is to pre-embed these labels on plastic box panels and trays. It is not easy to get rid of scrubbing, collision or rubbing.
Only a few micron-sized rfid labels are available to track the true source of food, medicines and other items in plastic containers that come in through various supply channels. The shipping date of each shipment and the shipping port and other information on the packaging materials are encoded into the label. After the goods arrive at the destination port, the information in the label can be read out with the instrument. Goods that are not in any plastic label or have no information on the label may be counterfeit.
4, holographic pattern
Three-dimensional holographic patterns that are not easily copied by counterfeiters have been widely used in the anti-counterfeiting aspects of credit cards, currency and bills, and their safety performance is generally recognized. Holographic patterns are also printed on plastic wrappers to differentiate brands and protect products from counterfeiting. Plastic packaging films printed with holographic patterns are generally pvc, pet, opp and bopp films. Printing a holographic pattern onto a plastic film requires several steps. It is often necessary to apply a layer of embossed coating to the finished film before printing the holographic pattern. Toray Plastics (USA) recently introduced pet film that can be directly printed with holographic patterns without additional coating. It is said that the advent of the product has accelerated the commercialization of new holographic patterns.
Another invention is a new technique for printing holographic patterns onto plastic parts during the injection molding process. The holographic pattern of the template is inlaid into the mold in advance, and the plastic part with the hologram pattern can be injected. The advantage of this type of holographic patterning technology is that it saves the processor's time and money. Because they do not need to spend time and process to print holographic patterns.
Holographic patterns can also be printed on shrink wrap. British watlordholoprotec can provide a pvc shrink sleeve with holographic stripes. The sleeve is a continuous flat hose that can be cut into sections or machined into special shapes for packaging beverages, alcohol, condiments and cooked foods.
5, laser marking system
Lasers are used to print dates, barcodes, codes, logos and patterns onto plastic parts for a wide range of applications in inventory control, inventory reduction and product differentiation. Not only that, because the laser mark does not generate interference signals, it will never be tampered with, so it can also be used for product anti-counterfeiting. Laser bar codes not only help track products on the supply chain, but also help packers and retailers remove unidentified items from the warehouse. Counterfeiters are unable to obtain the same equipment and materials for marking genuine products, so it is almost impossible to duplicate the same laser markings or decorative patterns. Laser marking is more legible than other methods such as inkjet and primer printing. Because the laser beam is extremely easy to use in computer programming, the marking made by the laser is more flexible.
Of course, the use of laser marking has its limitations, that is, the equipment is expensive and the colors available are few. However, the laser equipment has more industrial production capacity, and the unit production cost is declining. At the same time, new resin additives are continuously introduced, which makes the laser marking can adopt a larger color range, and is no longer limited to the usual black and white. Brown and grey.
Recently, a two-dimensional laser bar code for anti-counterfeiting has been newly developed, consisting of a large number of lines arranged on two edges adjacent to the frame and pattern marks and spaces distributed on the other two adjacent edges. Compared with ordinary bar codes, 2D bar codes can compile more data on plastic parts, and the bar code size is smaller. 2D barcodes are also more wear resistant than traditional barcodes. In plastic anti-counterfeiting applications, 2D laser bar codes are more used in electronic parts, medical equipment, pharmaceutical packaging and perfume bottles.
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