Disadvantages and usage process of extruder

The appearance of the extruder is not up to standard, specifically manifested as scratches on the surface of the extruded insulation layer; Coarse and dry with sand holes or micro cracks; All the drawbacks caused by insufficient melting. The key reason is:

1, The heating temperature of the extruder head is too high, causing roughness, or the temperature is too low, causing microcracks;

2, Squeezing the top block is not recommended. Too small to cause hemp lines; Excessive displacement or loose compression molding;

3, There is residue stuck and scraped on the surface of the protective wire sleeve in the squeezing top block;

4, The protective wire sleeve is scratched inside the stainless steel sink;

5, There is damage in the top block sizing area.

Extruders play a crucial role in our daily lives and can also be used normally to meet the requirements. Especially in the production workshop, their use is particularly extensive. Take the PE pipes that are usually used as an example, they are produced by such equipment, as well as plastic sheet production lines, twin-screw sheet extruders, ABS sheet extruders, and so on, which have practical standards. In the process of use, they also have practical standards. Such extruders are divided into single and twin-screw extruders.

The composition structure of an extruder mainly consists of three parts, namely the head, body, and tail, to achieve normal operation of the machine equipment. In addition to the structure of the above three parts, it also includes another important part, which is the frequency converter, which is used for speed regulation and control of the above three parts. The machine head is the extrusion part of the plastic processing component, which is an important choice for regulating the speed; The body is a structure constructed by rolling processed components; The tail of the machine is made of sheet metal and then coiled into piles under the action of small cylinders for easy stacking and transportation.

In the actual use of the extruder, due to customer needs, we often need to constantly switch, such as producing 80 kilograms of product A and then recycling to produce 200 kilograms of product B, and so on. Next, let's talk about the correct method for switching colors and materials.

1, Discuss the sequence of raw material and finished product flow in and out of the operation site, and arrange it so that operators can spend less energy on mobile transportation vehicles.

2, Write out the cleaning or dismantling procedures for each product produced, which helps operators plan their time and eliminate their disputes about how much machine head material will be generated.

3, The batch size of the product should correspond to the size of the extruder. This needs to be emphasized, as many processors have unplanned production schedules and use 75 machines to produce 500 pound orders, resulting in 300 pounds of waste.

4, Assist the operators in placing clean operating tools around the extruder. If there are frequent material changes, set up a workbench around the extruder to prepare everything needed.

5, Clean up the next product's requirements for machine cleanliness. If you know that the next product requires all manual cleaning machines, then don't waste time and materials on cleaning machines.

6, If possible, schedule production in the order of reducing cleaning. This means going from light colors to dark colors, and conversely, you cannot avoid disassembling the machine multiple times.

The typical reduction ratio should be between 10:1 and 20:1. In the first stage, both gears and pulley systems can be used, but in the second stage, gears are preferred and the screw is positioned at the center of a large gear. For some slow running machines (such as twin-screw used for UPVC), there may be three deceleration stages, and the maximum speed may be as low as 30rpm or lower (with a ratio of 60:1).

On the other hand, some long twin-screw used for stirring can operate at speeds of 600rpm or faster, requiring a low deceleration rate and deeper cooling. If the deceleration rate is mismatched with the work, too much energy will be wasted. At this point, it may be necessary to add a pulley system between the motor and a deceleration stage that changes the high speed, which either increases the screw speed or even exceeds the previous limit, or reduces the high speed. This can increase the available energy, reduce the current value, and avoid motor failures, in which case the output may increase due to material and cooling requirements.