Blown film technology is a widely used processing method in the manufacture of plastic products. In blown film technology, an anti-blocking masterbatch is a crucial component. Selecting the right anti-blocking masterbatch can ensure that plastic products have good physical performance and functionality.
This article will be divided into three parts, introducing the role of anti-blocking masterbatch in blown film technology, the difference between ordinary anti-blocking masterbatch and food-grade anti-blocking masterbatch, and how to choose the right anti-blocking masterbatch for blown film.
1. The role of anti-blocking masterbatch in blown film technology
In blown film technology, the role of anti-blocking masterbatch is to form a gap in plastic products, giving them the ability to open. Anti-blocking masterbatch is usually added to plastic pellets and mixed with other additives for processing in a blown film machine.
During processing, the anti-blocking masterbatch is uniformly mixed in a molten state and then stretched and oriented as the film is formed. Ultimately, plastic products with an opening function are produced.
2. The difference between ordinary and food-grade anti-blocking masterbatch
When selecting an anti-blocking masterbatch for the blown film, it is necessary to understand the difference between ordinary and food-grade anti-blocking masterbatch. Ordinary anti-blocking masterbatch is generally used for manufacturing plastic products that do not come into contacts with food, such as hangers and pencil cases. This type of anti-blocking masterbatch is relatively low in cost but is not suitable for plastic products that come into contact with food. Ordinary anti-blocking masterbatch may contain harmful substances such as benzene, toluene, xylene, and other volatile organic compounds, which may contaminate food.
In contrast, a food-grade anti-blocking masterbatch is a safer and more environmentally friendly option. This type of anti-blocking masterbatch is usually produced from food-grade raw materials, does not contain any harmful substances, and complies with relevant national standards and regulations. Therefore, if you need to manufacture plastic products that come into contact with food, it is recommended to choose a food-grade anti-blocking masterbatch.
3. How to choose the right anti-blocking masterbatch for blown film
When selecting an anti-blocking masterbatch for the blown film, the following factors should be considered:
3.1 Consider the application of plastic products
When selecting an anti-blocking masterbatch for the blown film, the first thing to consider is the application of the plastic product. Different plastic products have different requirements for anti-blocking masterbatch.
For example, some bagged foods may require an anti-blocking masterbatch with high water resistance and antioxidant performance, while other plastic products may require higher flexibility and wear resistance. Therefore, the selection of the appropriate anti-blocking masterbatch should be based on specific product requirements.
3.2 Select an anti-blocking masterbatch that meets national standards
When selecting an anti-blocking masterbatch, it should be ensured that it complies with relevant national standards and regulations. In China, anti-blocking masterbatch needs to comply with standards such as GB9685-2016 “Hygienic Standards for Additives Used in Food Contact Materials and Products” and GB/T5009.74-2017 “Determination of Additives in Food: Non-Volatile Organic Acids”.
3.3 Consider the scope of application of anti-blocking masterbatch
The scope of application of anti-blocking masterbatch is also an important factor in selection. Anti-blocking masterbatch needs to synergize with other additives to ensure that plastic products have good performance and functionality. Therefore, when selecting an anti-blocking masterbatch, it should be considered whether it is suitable for the other additives used, and ensure that they can coordinate with each other.
3.4 Choosing the appropriate amount to add
Finally, when selecting an anti-blocking masterbatch, it is necessary to choose the appropriate amount according to specific processing requirements. The amount of anti-blocking masterbatch should not be too low, otherwise, it may not form the necessary openings. If the amount is too high, it may have adverse effects on the physical properties of the plastic products, such as making them brittle and easy to break.
The blown film process is a widely used processing method in the production of plastic products. When selecting a suitable anti-blocking masterbatch for the blown film, factors such as the intended use of the plastic product, compliance with national standards, the scope of application of the anti-blocking masterbatch, and the appropriate amount to add should be considered.
For plastic products that need to come into contact with food, it is recommended to choose an anti-blocking masterbatch that meets food-grade standards to ensure the safety and environmental protection of the plastic products.