New Coextrusion Cast Film Line

The new co-extruded cast film line New Co-Extrusion Castfilm Line is widely used in packaging, such as vacuum packaging, wrapping, etc., and is a very versatile packaging material. This issue introduces a manufacturer of film production lines in Austria to understand the new developments in their film production lines. Austria's LENZING's new coextruded cast film line offers a net production width of 2M, with up to 5 layers of film, a production speed of 270M/MIN, and an annual net output of up to 4000T. This line has 3 extruders: a 120mm/33D main extruder; two sub-rollers with 60mm and 90mm barrel diameters. The total extrusion capacity reaches 800KG/H or more. The extruder is equipped with a LENZING filter mesh filter CONTI. The main advantage of this filter is that during the production process, the pressure drop after the filter material net is strictly controlled, the melt temperature of the polymer material is hardly affected, and the quality of the product is thus stable. Each filter mesh is 10M long. Each extruder is equipped with a gravimetric weighing hopper to measure the actual throughput of the extruder. If there is a deviation in the output, the weight system automatically sets a new screw speed to compensate for the increase or decrease in output. For example, when the filter mesh is contaminated, the melt pressure rises, which usually causes a decrease in the yield. In this case, the gravity system will reduce the output and increase the speed of the screw to compensate. Thanks to this gravity-type control system, the consumption of raw materials has been reduced to a minimum because the thickness of each layer of film is strictly controlled, which is particularly important for processing more expensive raw materials such as EVOH and PA. Making good use of borders is a necessary condition to ensure the profitability of the production line. If the edge material accounts for 10% or 15% of the total processing capacity of the production line, it is not difficult to understand the importance of this issue. An annual production of 4000T production, there are 600T materials to return to the production process. The value of these materials amounts to $600,000 per year. The LENZING production line has unique advantages.
First, an internal amplitude modulation system is installed in the automatic die. The width of the film can be adjusted within the range of 1.6M to 2.15M depending on the actual suspension condition. Of course, the software of the control system changes the width of the gap. As a result, the edge material is reduced. Secondly, SCRAPTRUDERTM developed by SML ensures that uncontaminated tablets are immediately returned to the main extruder. The edge material is processed as follows: a powerful Venturi system, which sucks the edge material from the edge cutting table of the winder, and sends the edge material to the film grinding machine with airflow, where the edge material is ground into Fine sheet material. The sheet is then sent to the SCRAPTRUDERTM, which then compresses the sheet with its 90 MM feed screw and feeds it 90. Corner connection in the main extruder. The problem of sand is encountered when the sheet is conveyed by a conventional metering system. In particular, when the film is less than 50 μ in thickness, a fluffy material bridge will accumulate in the hopper and impede the continuous flow of the material. The main extruder can process a high percentage of edge sheet material at high speed. The 33D long screw provides excellent uniformity on the one hand and melt pressure fluctuations on the other hand. In SCRATPTRUDERTM, the sheet material is not thermally strained because it is compressed and melted and the feed screw is cooled with cooling water. The casting apparatus has a 800 MM diameter X2600 mm wide main chill roll, and a 408 MM diameter second chill roll. The third chill roll was used after the corona treatment device to compensate for heating during corona treatment and to help control the bowing effect of the PA structured film. In order to ensure good contact between the film and the surface of the chill roll, the die head is equipped with a double vacuum box. With the help of a double vacuum box, the production of CPP film with a thickness of more than 60μ becomes easy. Because vacuum increases cooling efficiency, the clarity of the film is also improved. When using a double vacuum box to produce a stretched film, high speed is possible. The polymer is drawn from the gap and requires relaxation time. This will produce elongation, which is necessary for some applications. One of the features of this new production line is the patented in-line slitting winder from the company, known as the 2000 winder. The maximum reel diameter is 1000MM, and the film thickness is 12~400μ. This reeling shall include the automatic unloading of the completed reel, the use of a movable lifting table and a one-person integrated shaft handling robot, 3" and 6" shafts are all possible. This winder is suitable for winding LLDPE stretched film at a speed of 500M/MIN. It operates in balance, anchor rods in concrete, 100% of which transmit vibrations to the sidewall body, and vibrations are immediately attenuated by the polymer concrete with inherently high damping constants. A special device for adjusting the angle is also attracting attention. In this device, the film is contacted by a sensitive contact roller and the reel, and the air sucked between individual film layers can be specified to determine its hardness. This system is called EAO. -SYSTEM. This system is adjusted online with a high-precision servomotor. Precision electronic equipment, combined with the latest technology in ultra-light carbon fiber roller design, ensures unparalleled sensitivity to film tension control. Since the winding tension is controlled by the dancer roller, the drum is controlled in the speed control mode and is not the normal torque control mode. Now only the necessary load is applied by the special cylinder, the floating roller correspondingly introduces the necessary winding tension. The CFK roller weighs only 12KG, 2600mm wide, and has excellent dynamic response. The installation power of the main reel drive is no longer a criterion for the sensitivity of the winder. Stronger gears for large diameter webs can now be installed because the ultra-lightweight roller controls the winding tension. Excerpt from: Chinese packaging

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