As a supplier of Disposable MAP Plastic Trays, I am often asked about the manufacturing process behind these essential products. Modified Atmosphere Packaging (MAP) plastic trays are widely used in the food industry to extend the shelf life of products by altering the composition of the air inside the package. In this blog post, I will take you through the detailed manufacturing process of disposable MAP plastic trays.
1. Raw Material Selection
The first step in manufacturing disposable MAP plastic trays is selecting the appropriate raw materials. Commonly used plastics for these trays include polypropylene (PP), polystyrene (PS), and polyethylene terephthalate (PET). Each material has its own unique properties that make it suitable for different applications.
Polypropylene is a popular choice due to its excellent chemical resistance, high melting point, and good impact strength. It is also relatively lightweight and can be easily recycled, making it an environmentally friendly option. You can find our Eco - friendly Disposable PP MAP TRAY which is made from high - quality polypropylene.
Polystyrene is known for its clarity, stiffness, and insulation properties. It is often used for trays that require good visibility of the contents, such as in the display of fresh produce or bakery items.
Polyethylene terephthalate is a strong and lightweight plastic with good barrier properties against oxygen and moisture. It is commonly used for packaging products that are sensitive to oxidation, like meats and cheeses.
2. Plastic Resin Preparation
Once the raw material is selected, the plastic resin is prepared. The resin usually comes in the form of small pellets. These pellets are carefully inspected for quality and purity. Any impurities or contaminants are removed to ensure the final product meets the required standards.
The pellets are then dried to remove any moisture. Moisture in the resin can cause defects in the trays during the manufacturing process, such as bubbles or uneven surfaces. The drying process is typically carried out in a hopper dryer at a controlled temperature for a specific period of time.
3. Extrusion
The next step is extrusion. In this process, the dried plastic pellets are fed into an extruder. The extruder consists of a heated barrel with a rotating screw inside. As the screw rotates, it pushes the plastic pellets forward through the barrel. The heat in the barrel melts the plastic, turning it into a molten state.
The molten plastic is then forced through a die, which gives the plastic its initial shape. For disposable MAP plastic trays, the die is designed to create a flat plastic sheet of the desired thickness. The thickness of the sheet can vary depending on the application and the strength requirements of the tray.
4. Thermoforming
After the plastic sheet is extruded, it is ready for thermoforming. Thermoforming is the process of shaping the plastic sheet into the desired tray shape. The plastic sheet is first heated to a temperature where it becomes soft and pliable. This is usually done using infrared heaters or hot air ovens.
Once the sheet is heated, it is placed over a mold that has the shape of the tray. A vacuum is then applied to the mold, which sucks the plastic sheet down onto the mold, taking on its shape. In some cases, pressure may also be applied to ensure a more precise and detailed shape.
After the plastic has cooled and solidified in the mold, the formed tray is ejected from the mold. The excess plastic around the edges of the tray is trimmed off, leaving a clean - edged tray.
5. Printing and Labeling
Many disposable MAP plastic trays require printing or labeling for branding, product information, or instructions. Printing can be done using various methods, such as flexographic printing, offset printing, or digital printing.
Flexographic printing is a popular method for printing on plastic trays. It uses a flexible relief plate to transfer ink onto the surface of the tray. This method is suitable for high - volume production and can produce high - quality prints with a wide range of colors.
Offset printing is another option, which offers excellent image quality and color accuracy. It is often used for trays that require detailed and precise printing.
Digital printing is a more recent technology that allows for quick and easy printing of small batches or customized designs. It is ideal for short - run production and can produce variable data printing, such as barcodes and serial numbers.
6. MAP Integration
One of the key features of disposable MAP plastic trays is their ability to support Modified Atmosphere Packaging. After the trays are formed and printed, they are ready for MAP integration.
The MAP process involves replacing the air inside the package with a specific gas mixture. The gas mixture is carefully selected based on the type of product being packaged. For example, for fresh meats, a gas mixture of oxygen, carbon dioxide, and nitrogen may be used to inhibit the growth of bacteria and extend the shelf life.
To create the MAP environment, the product is first placed in the tray. Then, the tray is sealed with a lid film. The lid film is usually made of a plastic material with good barrier properties. Before the lid film is sealed, the air inside the tray is removed using a vacuum pump, and the gas mixture is introduced into the tray.
7. Quality Control
Quality control is an essential part of the manufacturing process. At every stage of production, from raw material selection to the final product, strict quality control measures are in place to ensure that the trays meet the required standards.
The trays are inspected for defects such as cracks, holes, or uneven surfaces. The thickness of the trays is also measured to ensure it is within the specified range. The gas barrier properties of the trays and the lid film are tested to ensure that they can effectively maintain the MAP environment.
In addition, the trays are tested for their strength and durability. They are subjected to various stress tests, such as stacking tests and drop tests, to ensure that they can withstand the rigors of handling and transportation.
8. Packaging and Shipping
Once the trays have passed all the quality control tests, they are ready for packaging and shipping. The trays are usually stacked and packed in cartons or boxes. The packaging is designed to protect the trays during transportation and storage.
We offer a wide range of Disposable MAP Plastic Food Tray and Disposable Plastic Food MAP Frozen Tray that are carefully packaged to ensure they reach our customers in perfect condition.
Conclusion
The manufacturing process of disposable MAP plastic trays is a complex and precise operation that involves multiple steps. From raw material selection to packaging and shipping, each step is crucial in ensuring the quality and functionality of the final product.
As a supplier of disposable MAP plastic trays, we are committed to providing our customers with high - quality products that meet their specific needs. Whether you are in the food industry, looking for a reliable packaging solution for your products, or a distributor seeking a trusted supplier, we are here to help.
If you are interested in our disposable MAP plastic trays or would like to discuss your specific requirements, please feel free to contact us for a detailed quote and to start the procurement negotiation process. We look forward to working with you to find the best packaging solution for your business.
References
- "Plastics Packaging Technology" by Rosato, David V.
- "Modified Atmosphere Packaging of Food" by Ahvenainen, Riitta.
