EPDM sheet extruder, automotive interior parts extruder, rubber and plastic interior parts extruder

The foaming formula of sheet extruder is composed of the following raw materials: filler, foaming agent, bridging agent, foaming accelerator, and lubricant.
Obviously the main material is, of course, in order to improve the physical properties of the product, you can also add some other materials, such as rubber, etc., and you can even add a little to enhance certain physical properties. Well, the main indicator is content, and its level is directly related to almost all properties of foam products. certainly. Some can only be used for foaming. The specific main ingredients to use still depend on the requirements of the product. Fillers, currently calcium carbonate or talc are generally used. Its purpose is to reduce costs, increase product rigidity, etc., and it can also play a role in thermal conductivity. Generally, particle size is used as the quality indicator. Of course, moisture content is also one aspect, such as mesh, mesh, etc. In principle, the finer the better, but of course the price will be higher. The maximum dosage is the percentage of foaming agent as the main ingredient in the formulas I have seen. Generally, I am accustomed to using series of foaming agents. For example, series of foaming agents are high-temperature foaming agents with a decomposition temperature of several degrees. There are also low-temperature foaming agents, for example, with a decomposition temperature of 10 degrees Celsius, and medium-temperature foaming agents. Because the price difference is not big, and high-temperature foaming agents are relatively more stable, many old ones are now using high-temperature ones, and some are also used in combination. The dosage depends on the specific ratio. Bridging agents are the most commonly used now, but they were also useful in the past, etc. The half-life of ℃ is minutes, and ℃ is minutes. Therefore, when training materials, the temperature should be controlled below ℃ as much as possible. If some products have requirements for odor, you can use another bridging agent, which is generally used in conjunction with odor. The dosage is generally used in flat foaming and small in-mold foaming, and generally in injection foaming. Of course, there are also some appropriate additions and subtractions, and some use it differently. Foaming accelerators, there are two commonly used ones now, zinc oxide powder and zinc stearate powder. We used to use these two combinations here, but now we only use zinc oxide. A single product can also achieve the effect, and the stability of the product may be better. Zinc oxide can reduce the decomposition temperature of zinc oxide to about 10 degrees Celsius, which facilitates production. We have a consensus here that generally if the amount of zinc oxide does not exceed too much, the shrinkage of the product will be relatively larger. Of course, if too little, the foaming speed will be too slow, so it is best not to use less than the lubricant, usually stearic acid is used. In fact, it doesn't have much effect. It just prevents the material from sticking to the machine when practicing. Using too much is not good because it can reduce the friction between parts and reduce most physical properties. It is recommended that I will introduce you to the addition of auxiliary materials in foaming later.
The classification of extruders is as follows. According to the number of screws, they can be mainly divided into single and twin-screw extruders. According to whether they are vented, they can be divided into vented and non-vented extruders. According to the position of the screws, they can be divided into vertical and twin-screw extruders. Horizontal extruder. Our country's national standard stipulates the same preparation method for China's rubber and plastic molding machinery numbers: category number, composition number, auxiliary number, specification code, design code. The first three codes are the most basic codes. The specific methods are as follows
For plastics , is the extruder, is the screw diameter, and the length-to-diameter ratio is the specification parameter. The standard stipulates that the length-to-diameter ratio of the extruder is, and it does not need to be marked.
It is plastic, it is an extruder, it is a foaming variety, the code is screw diameter, and the length-to-diameter ratio of the screw is.
The extruder is generally composed of several parts such as the extruder head, die, auxiliary machine and so on. The extruder consists of basic screw and barrel transmission devices and heating and cooling.
Sheet extrusion mainly uses a single-screw extruder. The main parameters of a single-screw extruder are:
Screw diameter refers to the outer diameter of the screw, expressed in units, which can characterize the extruder. The size of the extrusion volume is an important parameter of the extruder.
The screw aspect ratio refers to the length of the working part of the screw, that is, the length of the threaded part is technically defined as the ratio of the length from the center line of the feeding port to the end of the thread and the diameter of the screw, represented by /.
The screw speed range refers to the maximum and minimum speed range when the screw rotates, expressed in (rpm), the unit is rpm
The driving motor power of the main screw refers to the motor power that drives the screw to rotate, expressed in (rpm), in units .
Barrel heating power and number of barrel heating sections. Barrel heating power refers to the barrel heating electric power, expressed in units. The number of barrel heating sections refers to the number of heating sections the barrel is divided into, that is, the number of temperature-controlled sections, represented by .
Extruder productivity refers to the production capacity of the extruder per unit time, expressed in units/.
The machine center height refers to the height from the center line of the screw to the ground, expressed in units.
The overall dimensions of the machine refer to the total length, width and height expressed in units.
The mass of the machine is expressed in tons or kilograms.
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