In the 1950s, Swiss company Habasit was the first to develop a light conveyor belt coated with PVC or PU resin on the surface of fabric framework material, thus opening up the era of lightweight conveyor belt. Subsequently, Siegling of Germany and Ammeraal of the Netherlands also entered the light conveyor belt industry.In 1972, Intralo company in the United States first applied lightweight and energy-saving plastic chain plate instead of metal mesh belt, avoiding the metal mesh belt easy to rust, difficult to clean, high power consumption shortcomings.This conveyor belt market is divided by PVC or PU conveyor belt and chain plate conveyor belt.
Light conveyor belt has the characteristics of flat and modular, suitable for a variety of applications.PVC or PU conveyor belt has excellent electrical insulation, flame retardant, chemical corrosion resistance, and low price of raw materials, easy to modify and processing, so many manufacturers.However, for animals, poultry, fish and other meat cleaning, segmentation process required by the meat segmentation zone, PVC or PU because of a large number of plasticizer and other harmful small molecules and health risks.The chain plate conveyor belt is widely used in the logistics industry due to its easy replacement and precise positioning. At the same time, because of its material resistance to cutting and impact, it is also widely used in meat segmentation, processing and transportation.However, the chain plate meat belt has the disadvantages of high energy consumption, water consumption, sewage discharge and antibacterial sanitation.The new antibacterial TPU meat segmentation conveyor belt can effectively solve the above problems, so it has a broad application prospect in slaughter and meat processing industry.
1. Application of chain plate meat segmentation belt
The chain plate meat splitting belt is a conveyor belt assembled by a plurality of modular chain plates through a hole and a shaft connection, wherein a plastic chain plate is more common. The material of the chain plate is rigid, cut-resistant and impact-resistant. It is suitable for conveying heavy materials. It can also withstand the impact of material loading, and has precise structure and accurate transmission positioning. However, due to the complicated structure of the conveyor belt of the chain plate material, there are many moving joints with friction, so the power consumption is large, and at the same time, the friction hole noise is often generated between the shaft hole portion and the chain plate. In addition, there are many gaps in the chain plate structure, and the meat chips, grease, fur, blood stains, etc. generated during the slaughtering process are easily adhered to the gaps of the chain plates, thereby increasing the difficulty of cleaning the meat strips of the chain plates. It is time-consuming and labor-intensive, and requires a large amount of clean water to be flushed, which significantly increases the treatment and discharge of sewage. Even so, a small amount of dirt such as meat remains in the gap. On the one hand, bacteria in the gap are prone to bacteria, such as Escherichia coli, Salmonella, Staphylococcus, and even parasite eggs, thereby causing meat. Severe pollution; on the other hand, the long-term existence of crack residue will lead to corruption, produce toxic substances such as cadaverine, accompanied by foul odor, and seriously pollute the conveyor belt and its meat. In order to improve the cleaning effect of the meatboard segmentation belt, the manufacturer usually uses a special cleaning agent, which also increases the degree of contamination and treatment difficulty of the wastewater after cleaning. In addition, in order to prevent the contamination of the meatboard segmentation belt and ensure that the meat produced meets the national and European and American countries' health and safety standards, the company must strictly sterilize the chain conveyor belt. A large amount of chemical reagents will inevitably be used in the disinfection process, which increases the possibility of chemical contamination of the meat, and also increases the content of chemicals in the washing water of the conveyor belt, increasing the degree of pollution of the wastewater and the difficulty of handling.
The wastewater after cleaning the chain plate meat stripping strip was found to have a COD of about 1500 mg/L; a BOD of about 8000 mg/L; an SS of 600 to 900 mg/L; a pH of 6.2 to 6.9; and an E. coli number of 5×10. 5 / L. According to the national standard (GB 13457-92), the three-level emission standard is: COD is 500mg/L; BOD is 300mg/L; SS is 400mg/L; pH is 6.0~8.5; E. coli is 10000/L [4 ]. From this comparison, it can be seen that the waste water in the meat stripping belt of the cleaning chain far exceeds the discharge standard stipulated by the national standard, and the wastewater must be treated to greatly reduce the values of COD, BOD, SS and E. coli, and can be discharged after reaching the standard. The high cost of wastewater treatment significantly increases the production costs of the company.
Since the chain meat segmentation belt is much higher than the PVC or PU conveyor belt in terms of power consumption, water consumption, and wastewater treatment cost, the market share of such a segmentation belt is currently significantly reduced.
2. PVC or PU meat segmentation belt application
The PVC or PU meat splitting tape is constructed by coating PVC or PU resin on the PET fabric skeleton material. It is well known that soft PVC contains a large amount of plasticizer, which is continuously released and migrated during use. On the one hand, the migration of plasticizers will lead to the material becoming harder, brittle and even broken. On the other hand, the plasticizer components precipitated have an effect on the smell and taste of the meat, and after such substances are ingested by consumers. Will directly affect your health. The relevant content published by the World Health Organization in 1995 pointed out that the phthalate esters used in PVC plastics are a class of environmental estrogens, a kind of chemical substances that must be controlled to disturb the body's secretion. The European Union announced the third category of key chemical risk assessments in 1997. Six of the phthalate esters were also listed by the US EPA as “a list of priority monitoring of pollution”, especially phthalic acid bis-2. Ethylhexyl ester (DEHP). At present, DEHP research on human toxicity is still insufficient, but from the existing research results, DEHP is similar to environmental hormones, because it will stay in the body for a period of time to be discharged, long-term intake will occur estrogen-like effects, leading to the human body Estrogen or anti-androgen activity increases, causing reproductive and developmental toxicity to the body, endangering male reproductive ability, promoting girls' precocious puberty, and causing human body secretion disorders and decreased immunity, which may cause liver cancer. Due to the serious harm to human health, DEHP is not easy to degrade and has bioconcentration properties, which have been classified as toxic chemicals by countries all over the world.
Although the surface plastic of the PU material has no risk of plasticizer precipitation and migration, the fiber fabric skeleton layer absorbs blood water or grease, and PU does not have antibacterial properties, which easily leads to contamination of the entire conveyor belt. Surface and bottom surface are contaminated by blood and oil
It will slippery and the conveyor belt will be difficult to clean. In addition, the PU material has a lower manufacturing cost than the PVC material, so there are fewer options.
3. Development and application of new antibacterial TPU meat segmentation belt
TPU is a thermoplastic elastomer material with a wide range of hardness, high mechanical strength, outstanding cold resistance, water resistance, oil resistance, etc. After appropriate antibacterial modification, it can have long-lasting antibacterial properties, especially suitable for the manufacture of meat segmentation. conveyor. TPU is a substitute for PVC or PU meat
The good material of the product division belt and the chain meat separation belt has been applied in the slaughtering and meat processing industries. The new antibacterial TPU meat segmentation belt is made of Kevlar monofilament as the skeleton layer material, which is coated with TPU by special extrusion and calendering process. Its structure is shown in Figure 1.
Compared with the above two types of traditional meat segmentation belts, the new antibacterial TPU meat segmentation belt has outstanding advantages in terms of energy saving, water saving, environmental protection, safety and hygiene, and long service life.
First of all, the new antibacterial TPU meat segmentation strip has a closed-closed solid body strip, which has no gap between the shaft holes or the chain plates, and no water-containing and oil-containing fiber fabric is exposed, which is convenient and simple to clean, and not only saves the cleaning water consumption, Moreover, it is not necessary to use special detergents and disinfectants, which can reduce the pollution of cleaning wastewater by chemical reagents, simplify the wastewater treatment process and reduce the production cost. Secondly, the quality of the new conveyor belt of TPU material is much smaller than that of the plastic chain conveyor belt, and it is an integral structure, which can effectively avoid the frictional power consumption of the shaft hole in the chain conveyor belt, so it has the advantage of low energy consumption during operation.
And reduce the cost of use. Furthermore, the new antibacterial TPU meat segmentation belt has a toothed structure.
Directly driven by a plastic gear wheel, it does not have a stretched state like the P VC or P U meat cutting belt during its operation, so this type of conveyor belt has a longer service life. In addition, the new antibacterial T P U meat cuts are cut in the meat.
Plasticizers will not be released during the transportation process, and biochemicals will not be produced for meat products. Compared to the P VC meat cutting belt, the new conveyor belt makes meat processing safer and healthier. At the same time, the new type of conveyor belt uses TPU material with excellent antibacterial properties as a coating layer, which can greatly inhibit the growth and reproduction of bacteria and reduce the possibility of meat contamination by fine bacteria. The new antibacterial T P U meat cut strips and the two traditional meat cut strips are compared before and after washing , the number of bacteria counts before and after washing , the test results are shown in Table 1
The number of colonies of the new antibacterial TPU meat segmentation belt was only 9.7 % of the chain meat segmentation zone and 24.1% of the PVC meat segmentation zone, indicating that the TPU material used in the new conveyor belt was obvious. The antibacterial effect, while its solid structure can effectively avoid the residue of meat, blood and dirt. This new type of transmission
The number of colonies after washing was still the lowest, only 25 % to 30 % of the traditional meat dividing zone , indicating that the solid belt of the new conveyor belt , the seamless structure of the gapless fabric and the fiberless fabric are easy to be cleaned . The meat strips of the chain plate have the highest content of fine bacteria before and after washing, and there is almost no way to ensure the safety of the meat and shorten the shelf life of the meat products. However, the number of bacteria in the P V C meat cutting zone was close to the chain zone before and after washing , much higher than the new type of conveyor belt . Obviously, the new anti-bacterial T P U meat cutting belt effectively controls the fine bacteria content during the processing, which can ensure the safety and health of the meat products and fully meet the national standard requirements. The comparison of the washing water consumption of several meat segmentation belts shows that the water consumption of the new antibacterial TPU meat segmentation belt is only 1 / 2 of the chain meat segmentation belt, which saves about 1/3 of the water consumption compared with the PVC meat segmentation belt. . It can be seen that the new anti-bacterial T P U meat cutting belt is easy to clean, saves the amount of washing water and cleaning time, and reduces the discharge of sewage. Its application can significantly improve the economic and social benefits.
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