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Deutsch 1. What is PVC cling film?
PVC cling film, also known as polyvinyl chloride cling film, is a common plastic packaging product, usually made of ethylene as a masterbatch through polymerization reaction. From the perspective of chemical composition, its main component, polyvinyl chloride, is obtained by polymerization reaction of vinyl chloride monomer (VCM). In this polymerization process, vinyl chloride monomer molecules are connected to each other to form long-chain polymers, thus forming the basic chemical structure of PVC.
In terms of physical form, PVC cling film is usually colorless and transparent in appearance, with a light and soft texture, good flexibility, and can easily fit the surface of objects of various shapes. It has a certain tensile strength, is not easy to break, and can maintain its intact shape under normal use conditions. Moreover, PVC cling film also has moderate viscosity, which allows it to fit tightly when wrapping food or other items, and plays a good sealing role. In daily life, our common PVC cling film is generally made into rolls, which is convenient for people to cut and use as needed. For example, in supermarkets, many plastic wraps used to wrap fresh fruits and vegetables are made of PVC; in home kitchens, people also use PVC plastic wrap to wrap leftover food and store it in the refrigerator.
II. The secret of PVC plastic wrap characteristics
(I) Excellent flexibility
PVC plastic wrap has a unique flexibility, which makes it shine in the packaging field. From a microscopic perspective, the interaction between PVC molecular chains is weak, allowing the molecular chains to move and bend relatively freely, thus giving the plastic wrap good flexibility. In daily life, we often see its excellent performance. For example, when packaging irregularly shaped cheese, PVC plastic wrap can easily fit every corner of the cheese and wrap it tightly to prevent the cheese from deteriorating due to contact with air. At the same time, it can also maintain the original shape of the cheese, making it easy to store and take. For example, when we need to package homemade cakes with unique shapes, it can bend and stretch according to the outline of the cakes, perfectly wrapping the cakes, which is both beautiful and can extend the shelf life of the cakes. In supermarkets, for fruit platters of various shapes, PVC cling film can also play a good role in flexibility, fit tightly, prevent fruits from colliding with each other, and keep the freshness of fruits.
(II) Good transparency
PVC cling film has good transparency, which is crucial for food display and sales. From an optical point of view, the molecular structure of PVC is relatively uniform, and the scattering of light is less, so that light can pass through the cling film more smoothly, thus showing good transparency. In the fresh food area of ??the supermarket, we can see fruits wrapped in PVC cling film, such as red apples and yellow oranges. The high transparency of the cling film makes the color and freshness of the fruit clear at a glance, which can attract consumers' attention and stimulate their desire to buy. Compared with foods in opaque packaging, foods wrapped in PVC cling film have more advantages in sales. For example, in the bread sales area, consumers can clearly see the shape, color and ingredients of bread wrapped in PVC cling film, which increases consumers' trust in the product and willingness to buy. For bread in opaque packaging, consumers cannot intuitively understand the condition of the bread, and the possibility of purchasing it will be reduced.
(III) Strong stretchability
PVC cling film has strong stretchability, which plays an important role in the packaging process. Its stretchability comes from the linear structure of the PVC molecular chain and the interaction force between molecules. During the stretching process, the molecular chains can be oriented along the stretching direction, so that the cling film can withstand a certain degree of stretching without breaking. When we need to wrap large items, such as a whole roast chicken or a large cake, the stretchability of PVC cling film comes in handy. We can easily stretch the cling film to cover the entire item, and we can tighten it appropriately as needed to ensure that the item is tightly wrapped. In industrial packaging, for some large mechanical equipment parts, PVC cling film can also be stretched and tightly wrapped to play a role in protection and dust prevention. During transportation, the stretched PVC cling film can better fix the items and prevent them from displacement and collision during transportation.
(IV) Chemical stability
PVC cling film has a certain chemical stability, which plays a key role in protecting food from the influence of external substances. From the perspective of chemical structure, the chlorine atoms in the PVC molecule make it chemically inert and can resist the erosion of some external substances. In daily life, food is often affected by external substances such as oxygen, moisture, and odor and deteriorates. For example, oxygen will cause the oil in the food to oxidize, making the food have a rancid smell; moisture will make the food damp, affecting the taste and shelf life; odor will spread and destroy the original flavor of the food. PVC cling film can effectively resist these influences. It can block the entry of oxygen and slow down the oxidation rate of food; prevent the invasion of moisture and keep the food dry; at the same time, it can isolate the external odor and keep the original taste of the food. In some food processing companies, PVC cling film is used to package food raw materials that need to be stored for a long time, such as spices, nuts, etc., to ensure that they are not affected by external chemicals during storage and maintain the quality of the raw materials.
III. Full analysis of production process
(I) Four-roll calendering process
The four-roll calendering process is a common process in the production of PVC cling film, and its process has strict and delicate steps. The first is the batching and mixing stage, where polyvinyl chloride resin, plasticizer, stabilizer, lubricant and other additives are put into a high-speed mixer according to a precise formula ratio. Under the action of the high-speed rotating stirring blades, various raw materials are fully mixed to form a uniform PVC mixture. This process is like a chef carefully mixing ingredients. The proportion of each raw material and the uniformity of mixing have an important impact on the quality of the final product. For example, the amount of plasticizer used will directly affect the flexibility of the cling film. If too little plasticizer is added, the cling film will become hard and brittle and difficult to adhere to the surface of the object; if too much plasticizer is added, the strength of the cling film may decrease and it may break easily.
Then comes the melt plasticization stage, where the mixed PVC mixture is conveyed to the extruder. Under the high temperature of the extruder and the strong shearing action of the screw, the PVC mixture gradually melts and plasticizes to form a uniform melt with good fluidity. This process is similar to heating ice cubes to melt into water, so that the PVC raw material changes from a solid state to a processable liquid state, preparing for the subsequent calendering. In the process of melting and plasticizing, the control of temperature and screw speed is crucial. If the temperature is too high, PVC may decompose and produce harmful substances, affecting product quality and safety; if the temperature is too low, the plasticization is insufficient, which will cause the cling film to have problems such as rough surface and uneven thickness.
Then enter the key calendering step, and the molten PVC melt is conveyed to the four-roll calender. The rollers of the four-roll calender are usually arranged in a specific way, such as T-type, L-type, S-type and Z-type, among which the Z-type roller arrangement can reduce the elastic deformation of the rollers and facilitate feeding, and is widely used. In the calendering process, the melt is continuously extended into a film with a certain thickness and width under the extrusion force of the rollers and different linear speeds. Parameters such as the gap between the rollers, the rotation speed, and the temperature play a decisive role in the thickness, surface quality, and physical properties of the film. For example, by adjusting the gap between the rollers, the thickness of the cling film can be precisely controlled; and by setting the roller speed ratio reasonably, the molecular chains of the film can be better oriented and the tensile strength of the film can be improved.
Finally, there is the cooling and shaping and winding and slitting process. The hot film coming out of the calender is quickly cooled by the cooling device to shape it and obtain a certain hardness. The cooling method usually adopts air cooling or water cooling. The air cooling method is simple, but the cooling speed is relatively slow; the water cooling method has a fast cooling speed and can make the molecular structure of the film tighter, thereby improving the transparency and gloss of the film. The cooled film is pulled to the winding device through the traction device, wound into a large roll, and then cut according to market demand to make PVC cling film products of different specifications.
The four-roller calendering process has many effects on the quality of PVC cling film. In terms of thickness uniformity, due to the relatively precise roller accuracy of the four-roll calender and the pressure control during the calendering process, cling film with good thickness uniformity can be produced. This is very important for ensuring the performance stability of the cling film during use. For example, when the cling film with uniform thickness is stretched, the force at various places is relatively uniform, and it is not easy to have local rupture. In terms of surface quality, by reasonably adjusting the calendering process parameters and the surface finish of the roller, the surface of the cling film can be made smooth and flat without obvious defects and lines, which not only improves the aesthetics of the cling film, but also reduces the damage to the surface of the packaged items during the packaging process. In terms of physical properties, the four-roll calendering process can orient the molecular chains of the cling film to a certain extent, thereby improving the tensile strength, flexibility and other physical properties of the cling film, making it more suitable for various packaging scenarios.
(II) Downward Blowing Water Cooling Process
The downward blowing water cooling process is another important PVC cling film production process with unique characteristics and advantages. The process first heats and melts the PVC raw material through an extruder to make it a melt with good fluidity. Similar to the four-roll calendering process, this process requires precise control of temperature and screw speed to ensure that the PVC raw material is fully melted and does not decompose.
After the melt is extruded from the extruder, it passes through a specific die head to form a tubular film blank. At this time, the film blank is blown downward into a cooling water tank filled with circulating cooling water. This is a key step in the downward blowing water cooling process. The water cooling system can achieve extremely fast cooling in 3 seconds, so that the film molecules are arranged more regularly during the rapid cooling process. Compared with the upward blowing air cooling process, the downward blowing water cooling process has a fast cooling speed, which makes the film have a lower degree of crystallinity and thus a higher light transmittance.
While cooling and shaping, the film blank is pulled vertically downward by the traction device to further adjust the thickness and width of the film. Due to the vertical downward traction and the water circulation constant pressure cooling, the downward blowing water cooling process performs well in controlling the film thickness tolerance, and can accurately control the thickness tolerance within ±3%. However, due to the unstable wind direction, the thickness tolerance of the upward blowing air cooling process is generally ±5%-8%. The uniformity of film thickness is of great significance to the smooth progress of the packaging process and the quality of the product.
The bottom-blowing water-cooling process also has high production efficiency. Its traction speed can be directly pulled to 200m/min, while the top-blowing air-cooling is limited by the cooling efficiency, and the traction speed is at most 120m/min. According to actual measurements by a large express bag factory, with the same 3-layer co-extrusion structure, the bottom-blowing water-cooling line produces 8 tons of film per day, which is equivalent to receiving 300,000 more express bag orders. In the peak season of e-commerce and other periods of surge in orders, it can bring more economic benefits to the company. The bottom-blowing water-cooling process also has advantages in function expansion. It supports 3-layer/5-layer co-extrusion and can meet the diverse needs of different customers for packaging performance.
Compared with other processes, the uniqueness of the bottom-blowing water-cooling process lies in its efficient water-cooling cooling method and vertical downward traction method. Water cooling can make the film cool and shape quickly in a short time, so as to obtain better molecular structure and physical properties; the vertical downward traction method helps to control the thickness and tension of the film more accurately, reduce the thickness tolerance, and improve the stability of product quality. In the field of film production, different processes are suitable for different product needs and production scenarios. The downward water cooling process, with its own advantages, occupies an important position in the market with high requirements for film transparency, thickness uniformity, production efficiency and functional expansion.
IV. Application Field Broadcast
(I) Food Packaging Field
1. Meat Preservation
PVC cling film plays an important role in meat preservation. Meat is rich in nutrients such as protein and fat, and is easily affected by microbial contamination and oxidation. Microorganisms multiply on the surface of meat, causing the meat to deteriorate and stink, shortening its shelf life. The presence of oxygen will cause the fat in the meat to oxidize, produce rancid odor and bad taste, and also change the color of the meat, reducing the appearance quality and edible value of the meat.
PVC cling film has good barrier properties and can effectively block oxygen and microorganisms from contacting meat. Its tight molecular structure can reduce the amount of oxygen that can pass through and reduce the oxidation rate of meat, thereby maintaining the fresh color and flavor of meat. For example, at the cold meat counter in the supermarket, we often see pork, beef, etc. wrapped in PVC cling film. After a long period of refrigerated storage, they can still maintain a bright red color, which is the embodiment of the effective oxygen barrier of PVC cling film. Relevant experimental data show that under the same storage conditions, the oxidation rate of meat wrapped in PVC cling film is 30% - 50% lower than that of unwrapped meat, and the shelf life is also extended by 2 - 3 days accordingly. PVC cling film can also prevent the loss of water and maintain the fresh and tender taste of meat. The water content in meat has an important influence on its taste and texture. Water loss will make the meat dry and woody and the taste will deteriorate. PVC cling film can form a relatively closed environment, reduce the evaporation of water, and keep the meat moist and tender at all times.
2. Dairy product protection
PVC cling film is also indispensable for dairy products. Dairy products such as milk, sour. Odors can change the original flavor of dairy products, making them taste worse and affecting consumers' eating experience; while microbial contamination may cause dairy products to deteriorate, become sour, bulge and other problems, seriously affecting their quality and safety.
PVC cling film has good barrier and sealing properties, which can effectively prevent the invasion of external odors and maintain the pure flavor of dairy products. In supermarkets, we can see all kinds of cheeses wrapped in PVC cling film. Even if there are other odors in the surrounding environment, the cheese can maintain its unique flavor. PVC cling film can also block the entry of microorganisms, provide a relatively sterile environment for dairy products, and extend their shelf life. Studies have shown that the shelf life of yogurt packaged in PVC cling film can be extended by 1-2 days at room temperature, and the extension effect is more obvious under refrigerated conditions. At the same time, the flexibility and transparency of PVC cling film also make the packaging of dairy products more beautiful, which is convenient for consumers to observe and choose.
3. Bread and candy packaging
In the field of bread and candy packaging, PVC cling film shows unique advantages. Bread is prone to losing moisture during storage, which causes the taste to become hard and cracked, affecting its edible quality. Candies, on the other hand, need to maintain their original shape and taste, and prevent moisture and adhesion. PVC plastic wrap can effectively retain the moisture of bread, keeping its taste soft at all times. Its good flexibility can fit the shape of bread tightly, forming a sealed environment to reduce moisture loss. Relevant experimental data show that the moisture content of bread wrapped in PVC plastic wrap only drops by 5% to 8% after being placed at room temperature for 2 to 3 days, while the moisture content of unwrapped bread drops by 15% to 20%, and the taste becomes significantly harder. For candies, PVC plastic wrap can prevent candies from getting damp, maintaining their crispy or soft and glutinous taste. At the same time, PVC plastic wrap has high transparency, which can clearly show the color and shape of candies, increasing the attractiveness of the product. On candy production lines, PVC plastic wrap is widely used in single or whole bag packaging of candies to ensure the stable quality of candies during transportation and sales.
4. Fruit and vegetable preservation
PVC plastic wrap also performs well in preserving fruits and vegetables. After being picked, fruits and vegetables are still living organisms that will breathe, consume oxygen and produce carbon dioxide and water. If the respiration is too vigorous, it will accelerate the aging and deterioration of fruits and vegetables. The loss of water will also cause fruits and vegetables to lose their freshness, become shriveled and withered.
PVC plastic wrap has certain air permeability and moisture permeability, and can adjust the gas environment and humidity around fruits and vegetables. It can appropriately reduce the concentration of oxygen and increase the concentration of carbon dioxide, thereby inhibiting the respiration of fruits and vegetables and delaying their aging process. For example, for fruits such as apples and bananas, after being packaged with PVC plastic wrap, their respiration intensity can be reduced by 20% - 30%, and the shelf life can be extended by 3 - 5 days. At the same time, PVC plastic wrap can also maintain the humidity on the surface of fruits and vegetables, reduce the evaporation of water, and keep them plump and fresh. In the fruit and vegetable section of the supermarket, we can see a large number of fruits and vegetables wrapped in PVC cling film. They look fresh and juicy, thanks to the preservation effect of PVC cling film. PVC cling film can also prevent fruits and vegetables from mechanical damage and microbial contamination, further extending their shelf life.
(II) Industrial packaging uses
1. Wire and cable packaging
In the field of wire and cable packaging, PVC cling film plays a key role with its unique properties. Wires and cables need to have good insulation properties during use to ensure the safety and stability of power transmission. If the insulation performance of wires and cables is damaged, it may cause current leakage and cause safety accidents. At the same time, wires and cables are usually exposed to various environments, such as damp underground, outdoor wind and rain, etc., and are easily corroded by moisture and corrosive substances, affecting their service life.
PVC cling film has excellent insulation properties and can effectively isolate the conductors inside wires and cables to prevent current leakage. Its molecular structure contains chlorine atoms, which makes PVC
material have high resistance and can prevent the passage of current. For example, the wires used in home decoration are usually wrapped with a layer of PVC cling film as an insulation layer to ensure the safety of users' electricity use. PVC cling film also has good moisture-proof properties, which can block the intrusion of moisture and protect the internal structure of wires and cables from the influence of humid environments. In some underground cable laying projects, PVC cling film is widely used in the outer packaging of cables to prevent groundwater from eroding cables. At the same time, PVC cling film also has certain anti-corrosion properties, which can resist the corrosion of some chemicals and extend the service life of wires and cables. In industrial production, wires and cables used in some special environments, such as chemical plants and electroplating plants, will be packaged with PVC cling film with higher anti-corrosion properties to ensure the normal operation of cables in harsh environments.
2. Protection of electronic components
PVC cling film is also an important protective material for electronic components. Electronic components are usually very sensitive to static electricity, dust and moisture. Static electricity may cause instantaneous high voltage shock to electronic components, resulting in component damage or performance degradation; dust will accumulate on the surface of electronic components, affecting their heat dissipation and normal operation; and moisture may cause problems such as short circuit and corrosion of electronic components, reducing the reliability and stability of electronic equipment.
PVC cling film can be specially treated to have antistatic properties, which can effectively prevent static electricity from damaging electronic components. In the production, transportation and storage of electronic components, the use of antistatic PVC cling film for packaging can greatly reduce the impact of static electricity on components. For example, on the production line of electronic components such as computer motherboards and mobile phone chips, workers will wrap the produced components with antistatic PVC cling film, and then carry out subsequent processing and transportation. At the same time, PVC cling film can tightly wrap electronic components to form a closed space to block the entry of dust. In the assembly workshop of electronic equipment, we can see various electronic components wrapped in PVC cling film, which are neatly placed and waiting to be assembled into complete electronic equipment. PVC cling film also has a certain moisture-proof performance, which can prevent moisture from corroding electronic components. In some humid environments, such as the rainy season in the south, electronic components wrapped in PVC cling film can better maintain their stable performance and reduce the occurrence of failures caused by moisture.
V. Development Status and Future Trend Insights
(I) Market Size and Growth Trend
As a widely used packaging material, PVC cling film occupies a certain share in the global and Chinese markets.
The global PVC cling film market size shows a steady growth trend, with multiple driving factors behind it. With the development of the global economy, people's living standards continue to improve, and the demand for food preservation and packaging is also increasing. In the food industry, whether it is fresh food, cooked food in supermarkets, or daily ingredients in home kitchens, the use of cling film is indispensable. In the industrial field, with the continuous development of industries such as electronic products and wires and cables, the demand for PVC cling film is also increasing. In addition, the rise of the e-commerce industry has greatly increased the demand for packaging materials for the transportation and storage of goods. PVC cling film has become the choice of many merchants due to its good performance and relatively low cost.
In the Chinese market, the market size of PVC cling film also shows a growth trend. With the rapid development of China's economy, the living standards of residents have significantly improved, and the requirements for food quality and safety have become higher and higher. PVC cling film is increasingly widely used in the field of food packaging. Whether it is large supermarkets, convenience stores, or household consumption, PVC cling film can be seen. China's manufacturing industry is also growing and developing, and the demand for PVC cling film in industrial packaging is also increasing year by year. Especially in some economically developed regions, such as East China and South China, due to their developed manufacturing industry and huge consumer market, the demand for PVC cling film is even more vigorous.
(II) Direction of technological innovation
In terms of production technology, enterprises are constantly exploring new technologies and methods to improve production efficiency and product quality. The application of intelligent control systems is becoming more and more extensive. By real-time monitoring of production parameters such as temperature, pressure, stirring speed, etc., it can ensure that every production link is carried out in the best condition. This not only improves production efficiency, but also greatly reduces the quality risks caused by human operational errors. Some companies have adopted advanced extrusion technology, which can more accurately control the thickness and uniformity of the film, making the quality of PVC cling film more stable. In the four-roll calendering process, the precision and surface finish of the rollers are improved by improving the design and manufacturing process of the rollers, thereby producing cling film with better surface quality.
In terms of product performance innovation, the development of PVC cling film with special functions such as antibacterial and antioxidant has become an important direction. By adding specific antibacterial agents or antioxidants, the cling film has the function of inhibiting the growth of microorganisms and delaying the oxidation of food, further improving the shelf life and safety of food. For example, in food packaging, PVC cling film with antibacterial agents can effectively inhibit the growth of microorganisms such as bacteria and mold, prevent food from spoiling, and extend the shelf life of food. Some companies are also developing PVC cling film with high transparency and high tensile strength to meet the needs of different customers for product performance. By improving the formula and production process, the transparency of the cling film is higher, which can better show the color and appearance of the food and attract consumers' desire to buy; at the same time, the tensile strength is improved, making it more durable and not easy to break during use.
(III) Sustainable development trend
With the continuous enhancement of environmental awareness, sustainable development has become an important trend in the PVC cling film industry. The research and development and application of degradable PVC cling film have received widespread attention. Traditional PVC cling film is difficult to decompose in the natural environment and will cause long-term pollution to the soil and water. In order to solve this problem, enterprises and scientific research institutions have increased their investment in the research and development of degradable PVC cling film. Some companies have developed degradable PVC cling film by adding degradable additives or using new degradable materials. These degradable cling films can decompose in the natural environment within a certain period of time, reducing the pressure on the environment.
In addition to the research and development of degradable PVC cling film, companies are also exploring other ways of sustainable development. Optimize production processes to reduce energy consumption and waste emissions in the production process; promote the use of recyclable materials to reduce dependence on raw materials; strengthen the recycling and treatment of waste cling film to improve resource utilization, etc. Some companies have reduced energy consumption in the production process by improving production equipment and processes, and have also classified and recycled waste generated in the production process, thus achieving resource recycling. Some regions have also established a waste cling film recycling system to encourage consumers to recycle waste cling film and put it back into production after processing, thus reducing resource waste and environmental pollution.
VI. How to correctly choose and use PVC cling film
(I) Selection skills
When choosing PVC cling film, the choice of brand is crucial. Well-known brands usually have a good reputation and credibility in the market, and they tend to pay more attention to product quality and safety.
Checking product quality certification is also an important link. Qualified PVC cling film products should have relevant quality certification marks, such as China's "QS" mark (now replaced by the "SC" mark), which means that the product meets the relevant national food safety standards and quality requirements. Some products may also obtain international certifications, such as the EU's CE certification, which further proves the quality and safety of the product. When purchasing, we must carefully check whether there are these certification marks on the product packaging to ensure that the cling film purchased is a qualified product that has been strictly tested.
We also need to pay attention to whether the specifications of the cling film are suitable for our own use needs. There are a variety of specifications for the width and length of cling film to choose from, and we can choose the appropriate specifications according to the daily use scenarios and the size of the packaged items. For example, for home use, you can choose a cling film with a moderate width, such as 30 cm or 40 cm, and a length of about 200 to 400 meters. This specification is convenient to use and does not take up too much storage space. If it is for commercial use, such as supermarkets, restaurants, etc., you may need to choose a larger size of cling film to meet the needs of large-scale packaging. When choosing thickness, thicker cling film usually has better durability and barrier properties, but the price is also relatively high. Generally speaking, for daily household use, you can choose a cling film with a thickness between 0.01 mm and 0.02 mm, which can meet basic preservation needs and has a certain cost-effectiveness.
(II) Usage method
When using PVC cling film, the correct cutting method can avoid waste and ensure the use effect. We can use the cutter that comes with the cling film. After pulling the cling film to the required length, we can cut the cling film neatly by gently swiping along the blade of the cutter. If you don't have your own cutter, you can also use sharp scissors to cut, but be careful to keep the cut neat and avoid burrs, which will affect the use and sealing effect of the plastic wrap. When cutting, the length of the plastic wrap should be reasonably controlled according to the size and shape of the packaged items to avoid being too long or too short. Too long will not only waste the plastic wrap, but also may cause wrinkles when wrapping the items, affecting the sealing effect; too short will not be able to completely wrap the items and will not play a role in preservation.
When wrapping items, make sure that the plastic wrap fits the surface of the items tightly to achieve a good sealing effect. For items with regular shapes, such as square cake boxes, round dinner plates, etc., you can spread the plastic wrap flat on the items, and then gently press from all sides to make the plastic wrap fit the edges of the items tightly. For irregularly shaped items, such as fruits and vegetables, you can first stretch the plastic wrap, and then start from the bottom of the item and gradually wrap it upwards, while gently pressing with your hands to make the plastic wrap fit the outline of the item. During the wrapping process, try to remove the air between the plastic wrap and the items, because the presence of air will accelerate the oxidation and deterioration of food. You can squeeze the plastic wrap gently to squeeze out the air, and then seal the edges of the plastic wrap.
When using PVC plastic wrap, there are some precautions to keep in mind. Avoid direct contact between PVC plastic wrap and hot food, because high temperature may cause harmful substances such as plasticizers in the plastic wrap to migrate into the food, causing potential harm to human health. When heating food, you should first remove the food from the plastic wrap and put it in a heat-resistant container for heating. Prevent PVC plastic wrap from contacting with oily food, as oil will accelerate the migration of plasticizers. Therefore, for foods with high oil content such as fried foods and meat, it is not advisable to use PVC plastic wrap to wrap directly. Also pay attention to avoid PVC plastic wrap being exposed to sunlight or high temperature for a long time, which may cause the plastic wrap to age and become brittle, reducing its performance and preservation effect. After use, store the plastic wrap properly in a cool and dry place, away from children to prevent accidental ingestion.
