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Packaging is the broadest field of plastic film applications. In recent years, with the improvement of environmental protection requirements and the continuous improvement of packaging functional requirements, technologies related to environmental protection and multilayer films have received much attention. Italian extrusion blown film technology suppliers have developed a variety of new products for these key directions to meet the market's pursuit of high investment returns.
The Italian extrusion blown film production line has a high investment return rate and is well-known worldwide.
Its equipment mainly includes two categories: the first category is dedicated to the production of recyclable films, providing equipment support for processing manufacturers and end users who are increasingly concerned about the environment; the second category aims to develop production lines that can achieve more layers. The production line obtains different product properties required by co-extrusion of polymers with different characteristics.
Italian machinery manufacturer Colines recently provided a 5-layer blown film production line for a processing plant in Asia. This type of Barrierblown production line can be used not only for the production of barrier films with EVOH layers, but also for the processing of polyolefin films and the manufacture of products such as stretch masks.
The production line has an effective width of 2200mm and is equipped with two 80, one 50 and one 65 screw diameter extruders. Of particular concern are the two back-to-back winders in the production line, which can perform gap, center-peripheral and contact winders. This winder called b / combiwind represents one of the best winding solutions on the market.
The equipment is developed on the basis of a winder applied to a complex cast film production line. To ensure the quality of the winder, it is also equipped with an air-expansion shaft loading and core winding system to complete the functions of the two winder stations. . The production line used for the production of barrier films exceeds 400kg / h, and the production of PE films can reach 500kg / h (all 5 extruders are required). The film thickness detector and corona processor ensure that the produced film reaches the desired quality.
In agricultural extruded products, large tubular silo bags are an interesting application example, especially for countries where agriculture accounts for a considerable proportion of the national economy.
Due to the strong volatility of agricultural product prices, farmers need effective storage methods, not only to preserve products, but also to control the quantity of products placed on the market. Traditional silage often requires the construction of fixed metal or masonry structures to store products directly on farmland. Therefore, the technology that does not require the construction of such structures will undoubtedly bring tangible economic benefits. And this can be achieved by using a “bin bagâ€: the plastic tube film is spread horizontally on the ground and the product is filled in mechanically from one end of the tube.
Once the tube membrane is filled with agricultural products, the other end will also be sealed, thereby creating an anaerobic process, stabilizing the product quality and avoiding mold or insect reproduction. When you need to use the products, you can use a special machine to open the bin bag and remove the required parts.
This tube film for silo bags is usually extruded at a thickness of 150-250 microns, and the standard size is 4-10 meters. The size of the silo bag is determined by the products that need to be stored, such as wheat, corn, soybean, forage, etc., but the overall specifications are consistent, requiring the film to have good mechanical properties, white / black, and UV resistance, especially to be elastic, It can be filled to a relatively high gravity / bulk density while minimizing the air in the bag.
The latest technology can produce three-layer co-extruded films of this type. The combined raw materials include linear low density polyethylene, metallocene and low density polyethylene.
Macchi recently provided a system for a large product group in South America, including a 120mm main extruder and two 100mm co-extruders, a three-layer 1300mm die and an IBC internal cooling device, that is A typical silo bag production line.
Because silo bags are usually filled with agricultural products weighing up to 200 tons and are subjected to relatively large mechanical pressures, it is extremely important to ensure the optimal distribution of the various layers of film. This can be achieved by careful design of the melt channel of the die head.
The extruded tube film is folded flat by a large traction mechanism without inserting edges, and then wound up by a shaftless winder specially designed for automatic production of fixed-length film rolls. The general length is 60-75 meters, average The production capacity is 1000kg / h.
In Europe, due to the low production volume, silo bags are less used for storage of agricultural products. However, this system has other applications, such as agricultural food waste or municipal organic waste composting. When the anaerobic process is completed, the product formed It can be sold as fertilizer.
Tecom, which specializes in the manufacture of blown film extrusion equipment, provides single-layer and multi-layer production systems of different specifications for processing various types of polyolefins and starch-based biodegradable polymers. Applications range from 0.007mm thick HDPE films 0.2mm multilayer film.
The model monobloc MB35B / 700 production line produces narrow-width films, processes PE resins and biodegradable starch-based resins, and has a maximum working width of 650 mm.
Due to the use of unique technical solutions and high-tech components, the high reliability and ease of use of Tecom's modern extrusion production line are fully reflected.
The production line is equipped with a traditional feeding extruder equipped with a nitriding steel screw with a diameter of 35mm and a length-to-diameter ratio of 30; a rotary extruder head with a cylinder screen changer and a center feed can be installed from 30- 100mm die head. The AC motor controlled by the digital frequency converter is installed behind the extruder through direct connection. The recently designed cooling ring with optimized cooling airflow is suitable for the processing of PE resin and biodegradable starch-based resin. It is equipped with a soundproof fan controlled by a digital frequency converter and an adjustable insert.
The adopted tangential surface type winder has a double station, and enters the following winder station through the secondary traction calender roll and pressure roll. The roll changing unit adopts a pneumatic flying knife cutting system. Other auxiliary equipment installed on the production line include pellet feeders, compound metering systems and corona processors suitable for flexographic printing.
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