How to adjust the traction speed of the Dalian plastic blown film machine?

Plastic blown film machine, as an important plastic processing equipment, has penetrated into people's lives and work, providing important support for the production of various plastic products. With the continuous advancement of technology and changes in market demand, plastic blown film machines will continue to grow and expand, bringing more convenience and benefits to the plastic product production industry.

Regular cleaning of the blown film machine is crucial. After each use, the surface of the equipment should be cleaned of dust, plastic debris, and other debris. For the extrusion system, after the equipment cools down, use specialized tools to clean the residual plastic raw materials inside the screw and barrel. For example, a copper brush can be used to gently remove plastic coke on the screw to avoid damaging the surface of the screw with sharp tools.

How to adjust the traction speed of the Dalian plastic blown film machine?

·Familiar with device control interface

·First, it is necessary to understand the control panel of the plastic film blowing machine. The control methods of different manufacturers' film blowing machines may vary. Usually, the control of traction speed is located in a dedicated operating area, which may be adjusted through knobs, buttons, or touch screens. For example, some film blowing machines have a knob labeled "Traction Speed" on their control panel. Clockwise rotation can increase the speed, while counterclockwise rotation can decrease the speed; Some advanced devices can input specific speed values on the touch screen for precise setting.

Refer to the operation manual of the equipment to clarify the adjustment range and unit of traction speed. Because the unit of traction speed may be in different forms such as meters per minute, meters per second, etc., understanding these basic information is necessary to accurately adjust the speed.

·Adjust according to product requirements

·Film thickness adjustment: If thicker films need to be produced, the traction speed should generally be appropriately reduced. Because thicker films require more time to cool and shape after extrusion, reducing the traction speed can allow the film to stay under the cooling air ring for a longer period of time, which is beneficial for the uniformity of film thickness. For example, when producing a thin film with a thickness of 0.1mm, the traction speed may be set to 10 meters per minute, while when producing a thin film with a thickness of 0.2mm, the traction speed may need to be reduced to 6-8 meters per minute.

Film width adjustment: For wider films, the traction speed also needs to be appropriately reduced under other unchanged conditions. This is because the surface area of the wide film increases after inflation, requiring more stable traction to ensure its shape and quality. At the same time, changes in the width of the film may affect the stability of the membrane bubbles. A lower traction speed helps maintain the balance of the membrane bubbles and prevent problems such as wrinkles or entanglement in the film.

·Match with extrusion speed

·When adjusting the traction speed, pay close attention to the extrusion speed. In an ideal situation, the extruded plastic melt should be able to be smoothly pulled forward by a traction device at a uniform speed, forming a high-quality film. If the extrusion speed is faster than the traction speed, the film will accumulate, resulting in uneven thickness or entanglement on the equipment; On the contrary, if the traction speed is too fast, the film will be stretched excessively, which may result in thinning or even breakage.

It is possible to determine whether the two match by observing the appearance of the film and the operating status of the equipment. For example, when waves or wrinkles appear on the surface of the film, it may be caused by a mismatch between the traction speed and extrusion speed. At this point, you can first adjust the traction speed and observe whether the film condition has improved. At the same time, you should also pay attention to whether the extrusion speed has changed (because the extrusion speed may be affected by factors such as raw material temperature and screw speed). During the adjustment process, it may be necessary to repeatedly experiment and find a better combination of traction speed and extrusion speed.

·Consider the characteristics of raw materials and environmental factors

·Influence of raw material characteristics: Different plastic raw materials have different flowability and physical properties. For example, low-density polyethylene (LDPE) has good fluidity and can be easily pulled after extrusion; Linear low-density polyethylene (LLDPE) has strong toughness and may require an appropriate increase in traction force during traction, which may require adjusting the traction speed or the pressure of the traction rollers. When changing the variety of raw materials, the traction speed should be readjusted according to the characteristics of the raw materials.

Environmental factors: Environmental temperature and humidity also have a certain impact on the plastic film blowing process. In high temperature environments, the fluidity of plastics will increase, and the extrusion speed may naturally accelerate. At this time, it may be necessary to increase the traction speed accordingly; In low temperature and high humidity environments, the cooling rate of plastics will increase, and it may be necessary to reduce the traction speed appropriately to ensure the quality of the film. Meanwhile, environmental changes may also affect the electrical and mechanical performance of equipment, such as motor speed, transmission efficiency, etc. These indirect factors also need to be considered within the adjustment range of traction speed.

Plastic blown film machine is a device used for manufacturing plastic film, widely used in fields such as food packaging, pharmaceutical packaging, agricultural covering film, etc. Its working principle is to extrude melted plastic onto a roller press, and then cool and press it to form a thin film. Plastic blown film machines are widely used in the national market, especially in the plastic packaging industry where they play an important role.

Plastic film blowing machines are widely used in fields such as food packaging, pharmaceutical packaging, building materials, agricultural covering films, etc. The plastic films produced by them have the advantages of moisture resistance, dust prevention, preservation, and corrosion resistance, and are widely used in various plastic products in production and life. With the improvement of people's living standards and the continuous increase in packaging demand, the market demand for plastic film blowing machines is also growing.

Regularly inspect the vulnerable components of the blown film machine, such as the filter screen, heating ring, and traction roller adhesive layer. After a period of use, the filter screen may become clogged with impurities and affect the filtering effect of the plastic melt, requiring regular replacement. Generally, the filter screen is replaced every time a certain amount of film is produced (such as every 100-200 hours of production time) based on the cleanliness of the raw materials and production time.