Application of the most popular anti-counterfeitin

2022-08-02
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Application of anti-counterfeiting of plastic products

at present, there are more and more counterfeit plastic products in the market, which have become a topic of concern. There are a wide variety of counterfeit plastic products, ranging from drug packaging, medical devices, sporting goods, electronic product testing machines to the parts and components of automobiles and spacecraft. Counterfeit products cause economic losses to genuine commodity manufacturers; Damage the reputation of famous brand products, increase the cost of maintaining product reputation and quality assurance, and sometimes cause harm to consumers

the product processing manufacturers and resin raw material manufacturers suffering from this problem are jointly seeking some product identification and verification technologies to solve the problem of product anti-counterfeiting and identification. These anti-counterfeiting technologies include particle identification and recognizable color, which are the materials and dyes of private high-tech enterprises with the largest range and the highest market share in Jinan experimental machine production base in China, RF resolution labels, holographic patterns, and laser marking systems for making wear-resistant etched bar codes

1. Particle identification

the original purpose of developing micro identification was to help track the source of explosives in the event of * * * incident, but now it is widely used to track and identify the authenticity of plastic products. The most typical particle identifications are those containing color bar patterns with special resolution functions or polymeric particles with special chemical components, which can be pre mixed with thermoplastic before molding. The diameters of particles are less than 50 microns (equivalent to the size of bacteria) and about 600 microns (equivalent to the size of salt particles), which are different

these particles are inert substances, usually do not react chemically, and can withstand the high temperature during molding without damage. By changing the number, model and color of each particle, or changing the chemical properties of the particle surface, millions of unique coding mixtures can be produced. Because the resin contains coded particles, the manufacturer and product information can be identified with a special code reading instrument

the marked particles are often mixed with plastic powder in advance, so that they can be used or concentrated during molding, and can be molded after being diluted during processing. The color strip micro identification on the plastic parts of injection molding, extrusion molding or rotational molding can be clearly identified by scanning with a microscope or a pattern resolving instrument. Some manufacturers make the logo fluorescent or magnetic, so that the authenticity can be easily identified with an ultraviolet irradiator or a magnetic scanner

2. Pigment and dye additive

another method to identify whether plastic parts come from the original factory is to mix plastic parts with pigments or dyes, and analyze the exposed parts and ultraviolet areas with a spectrometer. Those pigments or dyes will show unique patterns. Even if counterfeiters use very similar colors on their plastic products, they cannot obtain the same spectrum as the real ones

one of the recently invented anti-counterfeiting technologies uses "color changing" pigments. These additives contain multi-layer polymer light reflective coating, which is coated around a reflective aluminum chip, so that the color of the plastic changes with different viewing angles. The change of color, for example, from red to green, is caused by the interference of the angle of light waves reflected from different pigment layers. Color changing pigments make plastic consumer goods produce significant aesthetic effects, and because these effects are not easy to clone, they also have anti-counterfeiting function

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 in the resin is usually between 0.2% and 0.4%, which can be processed by standard processes such as injection molding, extrusion blow molding, thermoforming, calendering, extrusion film and in mold decoration

3. Radio frequency resolution/RFID tag

another method to identify plastic parts is radio frequency resolution (RFID) tag, that is, micro tags that can transmit radio signals are preset in plastic parts

these signals containing plastic part coding information are received by the radio receiver and forwarded to the relevant computer. RFID technology uses micro transmitter (radio transmitter) installed on semiconductor chip to store data. Most tags have both reading and data input functions. After the tag is powered on, it will be induced by the electromagnetic field emitted by the antenna of the radio receiver, and the receiver can read the data information on the tag

rfid tags are often attached to plastic parts in the form of adhesive labels. But over time, these labels are easy to be removed. The latest RFID tags are embedded in plastic parts during the injection molding process. The most common practice is to embed these labels on plastic box boards and pallets. It is not easy to get rid of it by washing, collision or friction

only a few microns of RFID tags can be used to track the true source of food, drugs and other items in plastic containers coming in through various supply channels. The shipping date, port of shipment and other information of packaging materials of each batch of goods shall be coded into the label. After the goods arrive at the port of destination, the information in the label can be read out with an instrument. Any goods without any label or any information on the label in the plastic packaging box may be counterfeit goods

4. Holographic pattern

the three-dimensional holographic pattern, which is not easy to be copied by counterfeiters, has been widely used in the anti-counterfeiting of credit cards, currencies and bills, and its security performance has been generally recognized. Holographic patterns are also printed on plastic packages to distinguish brands and protect products from counterfeiting. The plastic packaging films printed with holographic patterns are generally PVC, pet, OPP and BOPP films. Printing holograms onto plastic film requires several processes. Before printing holographic patterns, it is often necessary to apply a layer of convex coating on the finished film. The PET film recently introduced by Toray plastics (USA) can be directly printed with holographic patterns without additional coating. It is said that the advent of this product has accelerated the commercialization of the new holographic pattern

another invention is a new technology for printing holographic patterns on plastic parts during injection molding. The plastic parts with holographic patterns can be injected by inlaying the template set of holographic patterns into the mold in advance. The advantage of this technology is that it saves the time and money of the processor. Because they do not need to spend additional time and because the packaging bag structure can be customized according to requirements to print holographic patterns

holographic patterns can also be printed on shrink wrap. British watlordholoprotec company can provide a PVC shrink sleeve printed with holographic stripes. The sleeve is a continuous flat hose, which can be cut into sections or processed into special shapes, and can be used for packaging beverages, alcohol, condiments and cooked food

5. Laser marking system

uses laser to print date, bar code, code, identification and pattern on plastic parts. It is widely used in inventory control, inventory reduction and product differentiation. Moreover, since the laser marking will not produce interference signals and will never be tampered with, it can also be used for product anti-counterfeiting. Laser bar code can not only help track and monitor products in the supply chain, but also help packers and retailers remove goods without identification code from the warehouse. Counterfeiters cannot obtain the same equipment and materials for marking genuine products, so it is almost impossible to copy the same laser marks or decorative patterns. Laser marking is more legible than other methods, such as inkjet and primer printing. Because the laser ray can be easily programmed by computer, the marks made by laser are more flexible and diverse

of course, the use of laser marking has its limitations, that is, the equipment is expensive and there are few colors available. However, the laser equipment has more industrialized production capacity, and the unit production cost continues to decline; At the same time, new resin additives have been introduced continuously, which makes the range of colors that can be used for laser marking larger, and is no longer limited to the usual combination of black, white, brown and gray

recently developed a new two-dimensional laser bar code for anti-counterfeiting, which is composed of many lines arranged on the two adjacent edges of the box, pattern marks and spaces distributed on the other two adjacent edges. Compared with ordinary bar codes, two-dimensional bar codes can compile more data on plastic parts, and the size of bar codes is smaller. The two-dimensional bar code is also more wear-resistant than the traditional bar code. In terms of plastic anti-counterfeiting applications, two-dimensional laser bar codes are more used in electronic parts, medical devices, drug packaging and perfume bottles

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