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Your Position:Home > News> The company dynamic > How does plastic extruder clean and change color correctly?
How does plastic extruder clean and change color correctly?
Source: http://www.huazongsj.com Release time: 2017-12-22

How to clean the screw correctly?


(1) it is the most common and most effective way to remove the plastic from the screw with fire or fire, but it is absolutely impossible to use acetylene flame to clean the screw.
Acetylene flame temperature up to 3000 ° C, using acetylene flame to clean, please clean the screw will not only damage the screw metal properties, at the same time will also significantly affect the mechanical tolerance screw.
If acetylene flame in flame when baking a portion of the screw into lasting blue, so this area means that the screw of the metal structure changed, it would lead to the parts wear resistance is reduced, and even wear resistant layer and substrate metal strip.
In addition, local heating of acetylene flame will cause the side of the screw to overheat, leading to the bending of the screw.
Most screws are made of 4140HT steel, and the tolerance is very close, usually within 0.03mm.
The straightness of the screw is mostly within 0.01mm. When the screw is baked and cooled by acetylene flame, it is often difficult to return to the original flatness.
Correct and effective method: after the use of the screw, use the spray lamp to clean.
Because the screw has the heat in the process, the heat distribution of the screw is still uniform.

(2) choose the correct cleaner.

The commodity economy is highly developed today, there are many kinds of screw cleaner (screw cleaning material) in the market, most of it is expensive, the use effect is mixed.
Whether to use commercial cleaners, according to different manufacturers and production conditions;
Plastic processing enterprises can also use different resin for screw cleaning materials according to their own production conditions, which can save a small amount of money for the unit.

(3) choose the correct cleaning method.

The first step of cleaning the screw is to turn off the feeding insert, which is to close the bottom of the hopper.
Then reduce the speed of the screw to 15-25r/min and maintain this speed until the melt flow stops flowing at the front end of the die.
Barrel all the heating zone temperature should be set at 200 ° C.
Once the cylinder reaches this temperature, start cleaning immediately.
According to different extrusion process (may need to remove the die head to reduce the risk of extruder front high pressure), so when cleaning must be done by one person: the operator from the control panel to observe the screw rotation speed and torque, at the same time observe the extrusion pressure to ensure that the system pressure is not too high.
During the whole process, the screw speed should be kept within 20r/min.
In the application of low pressure die head, do not remove the die head to clean.
From processing in extrudate resin is converted into clean resin in full stop immediately and remove the die head, and then restart the screw (speed within 10 r/min), so that the residual cleaning resin.

(4) correct and appropriate tools and cleaning materials should include:

1. Heat-resistant gloves;
2. Goggles;
3. Copper scraper;
Copper brush; 4.
5. Copper wire mesh;
6. Stearic acid;
7. Electric drill;
8. Machine tube ruler;
9. Cotton.

Once the cleaning resin stops extrusion, the screw can be pulled out of the device.
For a screw with a cooling system, remove the hose line and the rotating connector before starting the screw extraction equipment (which may be attached to the gear box).
Use the screw extractor to push the screw forward to reveal the position of 4-5 snails for cleaning.
The cleaning resin on the screw can be cleaned by copper scraper.
After the cleaning resin on the exposed screw is cleaned, the equipment will be pushed forward 4-5 snails, and will continue to be cleaned.
In this way, most of the screw was eventually released.

Once most of the cleaning resin is removed, stearic acid is sprinkled on the screw.
Then use the copper wire net to remove the remaining residue. After the entire screw is polished by the copper wire mesh, the last step is wiped with cotton cloth.
This is to ensure that the next production of the screw does not carry any contaminants.
After the screw has been completely cleaned, it can be put aside until the other tools are completely cleaned.
If the screw needs to be preserved, it should be coated with grease to prevent rust.

Never use steel tools such as steel screwdrivers, scrapers, or pry bars to remove plastic from the screw, because steel can damage the surface of the screw and cylinder.

How to clean the cylinder correctly?

It is easier and easier to clean the drum than to clean the screw, but it is also very important.

1) when preparing cleaning machine barrel, barrel temperature was set at 200 ° C.

2) screw the round steel brush with the drill pipe and the electric drill as cleaning tools, and then cover the steel brush with copper wire mesh.

3) before inserting the cleaning tool into the cylinder, put some stearic acid into the cylinder, or sprinkle stearic acid on the copper wire of the cleaning tool;

4) when the copper wire net enters the cylinder, the electric drill is started to rotate, and the front and back motions are made artificially, until the front and rear movement become free of resistance;

5) after the copper wire is removed from the cylinder, use a piece of cotton cloth to wipe back and forth in the cylinder to remove any cleaning resin or residue of stearic acid;
After several times of this wipe, the cleaning of the machine can be accomplished.
After thorough cleaning the screw and barrel can be assembled at any time for the next production!!

Clean the color change, feed screw and die attention.

With the diversity of product diversification, the product is more and more colorful, the conversion between different materials, different color conversion between, cause the conversion time is long, waste much, cause a lot of confusion to the production management and operation, several thoughts on the below small make up for your reference, please correct me.

1, first clean the equipment after internal outside, in the transformation between different materials, color change must be done on the original raw material clean no dead Angle, in particular, is not easy to wipe, for less than place blow to clean, leave no dead Angle.
The residual material in the screw and barrel must be squeezed out first, and then removed and cleaned when necessary for the complicated equipment and mould.

2. If the cleaning agent is cleaned after cleaning, if there is no extrusion of the material to be produced, the appearance of the product can be put into normal production.
If not, follow the above 1.

3. Some small experience for reference.

A, if different materials, color production and conversion can be configured to pay the same mold, the mold is the most difficult to clean, so it can save time and materials.

B. Different colors of the same material can be modified in the feeding port, and the production of color masterbatch is adopted, so as to avoid the use of color powder to add production.
It can reduce the influence of different links on color.

C, can co-extrude the way to change the appearance color of the product, which can also reduce the transformation to the annoyance.

D, for conversion between materials, conditional word should be used with the series material products equipment, that is to do the PP pipe equipment, try to do the PP material of other products, don't go to do PE products.
Otherwise, it will cause product performance impact.

Key words: 华纵塑机,清洁机批发,塑料造粒机生产厂家