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ZHOUSHAN XINLU PLASTICS MACHINERY CO., LTD.
Zhoushan Xinlu is a professional OEM & OD of screw and barrels for extrusion and injection molding machines who provide high-quality & competitive burst-sales single and twin screw barrel economically and efficiently for nearly16 years!
At present,we produce high-quality series screw and barrel products such as filmblow, waste recycling granulation, extrusion pipe,plate, super-large parallel twin screw conical twin screw, micro-medical instrument screw barrel, food processing screw, and so on, which have received many favorable comments.
We must deal with and solve the various needs of clients in terms of quality, price,delivery time and after-sales service to seek for long-term partners. XINLU welcome to cooperate with you!
LATESTT NEWS
How to install and adjust the screw extruderInstallation of the barrel
When the barrel deviation, the screw may be difficult to load, barely loaded The screw will be squeezing noise, or damage the screw shaft And shaft sleeve, or scraping screw and barrel, causing disallowed damage. The way to adjust the deflection position of the barrel is to use the front end setting of the barrel The bracket, adjust the height and the left and right deviation.
Installation of screw
When installation, heat the extruder to the operating temperature while the screw is cold The installation is more convenient. When loading the screw is more difficult to the head of the screw shaft, the screw key or the groove are carefully adjusted to the consistent position, generally the flat key at the upper end, and then pushed into the screw.
The installation process is absolutely not to impact and force loading, and carefully check, to confirm that the screw reaches the required position, and turn the screw to check the installation status of the newly mounted screw.
Here is the general installation method for the conical twin screws of a plastic extruder:
1. Preparation Work
Clean relevant components of the extruder, including the barrel, screws, coupling, etc., to ensure there is no debris or dirt.
Check whether the new screws meet the specifications and whether there is any damage or deformation.
Prepare required tools, such as wrenches, screwdrivers, micrometers, etc.
Ensure the extruder’s frame is level with the ground, and adjust it if necessary.
Release all heaters on the screw barrel and connectors.
2. Installing the Screws
Insert the two screws symmetrically into the barrel, first pushing the screws tightly toward the small end of the barrel. Observe the position of the screws; typically, the screw heads should be flush with the barrel, or may be 1-2mm longer or shorter than the barrel.
Push the tails of the screws tightly backward toward the gearbox side and measure the backward distance (assume this distance is 22mm). Determine the thickness of the screw plug based on the relative position of the screws and the barrel in the first step:
If the screws are flush with the barrel in the first step, the screw plug thickness should be 17mm (22mm – 5mm).
If the screws are 1mm longer than the barrel, the screw plug thickness should be 18mm (22mm + 1mm – 5mm).
If the screws are 1mm shorter than the barrel, the screw plug thickness should be 16mm (22mm – 1mm – 5mm).
Generally, set the screw plug thickness to 17mm first, then adjust it according to actual conditions.
Tighten the screw plug into the screw shaft, then install the large nut onto the barrel. Reconfirm the screw position to check whether it has retracted by 5mm (4-6mm is acceptable).
Observe the gap between the two screws from the feed inlet to ensure it is uniform.
3. Final Inspection
Before starting the machine, reconfirm that the screws have retracted toward the gearbox side. Otherwise, when the machine starts, the screws will move forward to the small end of the barrel, which may cause issues such as immobility.
Do not operate the extruder without feeding material, as this may cause the screws to move forward and get stuck.
In 2018, words such as “green, environmentally friendly, and recyclable” became hot words in the plastic industry. As plastic gradually integrated into every aspect of our lives, it also posed a significant threat to the ecological environment and even us.
So far, humans have produced 8 billion tons of plastic, and the plastic straws flowing into the ocean alone weigh 8 million tons each year. Whether it’s the whales and turtles swimming in the ocean, the seafood on our dining tables, or the salt in the seasonings on our tables, they are all affected by plastic pollution, and ultimately humans themselves are not immune.
What are the impacts of using a large amount of plastic products? Nowadays, more and more research is attempting to solve this puzzle, and many insider information is gradually being exposed to the public eye. Consumers and manufacturers are eager to pay attention to alternatives to plastics, and bioplastics seem to be emerging as a potential option.
What is bioplastics? Simply put, bioplastics refer to the use of biological materials such as plants as raw materials to replace petroleum, hence they are also known as bio based plastics. Specifically, it requires polylactic acid (PLA) from plants such as corn and sugarcane; Or polyhydroxyalkanoic acids (PHAs) synthesized by microorganisms. PLA plastic is commonly used in the food packaging industry; PHA plastics are more commonly used in medical equipment, such as sutures and cardiovascular repair materials. Due to the fact that PLA plastic is mostly produced by large factories producing ethanol and other products, it is currently a cheap and common bioplastic, and many plastic bottles, containers, and textiles on the market are made from it.
Although both the market and consumers favor this plastic as a substitute, does bioplastics have inherent value in reducing carbon emissions? But it has always been the focus of debate. In the eyes of some proponents of bioplastics, 8% of the world’s oil is used to make plastics. When plastics are discarded, it signifies the beginning of carbon emissions. However, during the degradation process of bioplastics, the carbon content released into the atmosphere is much lower because most of the carbon is absorbed by growing plants.
However, the matter is not so simple. In 2011, a research report from the University of Pittsburgh reported that some plants planted for the production of bioplastics were related to environmental pollution incidents, involving fertilizer and land use. In this world where resources are increasingly scarce, how to allocate the only resources is also the focus of verbal debate, and using corn as a plastic production material instead of food is the center of the debate.
In terms of post-processing, according to data, discarded bioplastics in reality face various fates, some of which, like most petroleum based plastics, are thrown into waste landfills, while others are sent to industrial composting plants.
In industrial composting, it is necessary to apply a sufficiently high temperature to allow microorganisms to complete their degradation. Without high-intensity heating, bioplastics cannot be effectively degraded on time, which is no different from sending them to landfills or composting them in their own backyard. In addition, if they eventually enter the marine environment, their impact is no different from that of petroleum based plastics, both of which will decompose into tiny fragments. This slow process will continue for decades and pose a deadly threat to marine life, just like any other.
“If PLA bioplastics are released into the ocean, they will not be effectively degraded. At that time, they will become a cancer of the ocean like all industrial polymers,” said a scholar.
Although there is still controversy in the current academic community and some organizations regarding the benefits of bioplastics, in recent years, under the framework of circular economy, many governments, enterprises, and researchers have been optimistic about the prospects of bioplastics and continue to explore in this field.
The maintenance of a film blowing machine is a key factor in ensuring its service life and is the fundamental method for extending its lifespan. Proper maintenance methods can extend the equipment’s service life and ensure production. The following are the correct maintenance methods for film blowing machines
- Regularly check the temperature rise and mechanical transmission of each operating motor. Severely worn parts should be replaced in a timely manner to extend the lifespan of the entire machine.
- High temperature zones should be regularly cleaned of dirt to ensure sealing quality.
- Check that the temperature control is in good condition, the heating appliances are in good condition, and pay attention to adjusting the heating temperature at each point in a timely manner within the specified range.
- Every two days of operation, 6 # engine oil should be added to each moving component, especially at the bearings, gears, and gearbox.
- Place the sealing machine in a well ventilated and dry place, generally maintaining a room temperature of around 25 ℃.
- Regular dust removal should be carried out to keep the entire machine clean. When not necessary, unplug the power and cover it with a cloth.
- If the machine runs for too long, the cooling fan should be turned on before shutting down, and it should be turned off after the temperature drops, because shutting down without cooling can easily damage the high-temperature belt.
1. The PE pipe production line uses specialized extrusion machines for HDPE and PP pipes, with screws equipped with barriers and mixing heads. The machine barrel adopts a new type of slotted machine barrel, which has good plasticization and mixing effects, large extrusion volume, and is very stable.
2. The PE pipe production line is designed with spiral die heads for HDPE and PP large-diameter thick walled pipes. This die head has the characteristics of low melt temperature, good mixing performance, low mold cavity pressure, and production.
3. The PE pipe production line adopts proprietary technology for sizing and cooling systems, using water film lubrication and water ring cooling to meet the requirements of HDPE and PP materials, ensuring the stability of diameter and roundness in high-speed production of thick walled pipes.
4. The PE pipe production line adopts a specially designed multi-stage vacuum sizing box to control the vacuum degree, ensuring the dimensional stability and roundness of HDPE and PP pipes. The extruder and traction machine are controlled by imported speed controllers, which have good stability, high accuracy, and high reliability.
5. The operation and time of the PE pipe production line are programmatically controlled by PLC, with a good human-machine interface. All process parameters can be set and displayed through the touch screen. A dedicated extruder for marking lines can be assembled to produce pipes with colored markings that meet national standards.