Daily Archives: 9. January 2019

Problems In The Process Of Extrusion Of Pet Preform

It seems that the extrusion flash is only a one-time phenomenon in the molding process. However, the way the flash is designed is critical to maintaining the integrity of the Pet Preform. Here are some things that might go wrong:

The flash bag did not fill up enough space, so the pressure to push the plastic back into the container was too small to properly weld the gap. This condition is characterized by a “v” shaped notch at the pinch, indicating that the seam may be weak where the seam may crack.

The flash pocket is not large enough to hold all of the flash material, which creates excessive pressure towards the container. This creates a very thick plastic bump at the pinch. Depending on the characteristics of the plastic, the cooling rate and other processing factors, this extra thickness may cool at different speeds, move the volume, and cracks may occur.

If the processing conditions or mold pinch-off geometry is incorrect for any reason, it may have a negative impact on the integrity of the parison bond in the pinch-off area where the edges of the two molds are joined together.

After molding, the flash is removed manually or mechanically. Care must be taken, otherwise the container/part may be damaged, just like any post-forming process.

Flash can affect the appearance and function of plastic containers or components. Rough or excessive flash is visually unattractive. Excessive flash around the bottle neck can interfere with proper operation of the lid or cap.

Good extrusion blow molding design and engineering repair flash

Many adjustments can be made to solve the flash and pinch-off problems. This is mainly science – there is still a little art.

Pay special attention to the pinch-off area on the mold to ensure proper clearance. When the part is removed from the mold, too small gaps and flash edges will fall into the molded assembly. The gap is too big, it is difficult to trim, and it looks bad. Check the mold regularly to make sure the pinched land is in good shape.

Changing the parison thickness and clamping speed helps to adjust the amount of plastic that is pressed back into the container.

Changing the viscosity of the parison can adjust how much material will flow back into the container.

Control the duration and pressure of air blown into the mold. Make sure the process provides proper ventilation.

Test different flash pocket shapes. Adding a baffle or channel changes the speed at which the plastic is pushed back into the container and also affects the cooling rate.

Jilian Plastics has continuously adjusted the design and crafts of China Pet Bottle. We have also won the love and praise of many customers and determined to become a better reputation in the market.

Tagged ,

Fruit Juice Production Line Filling Machine Principle

The beverage filling machine is advanced in technology, with multiple card alarm bottles, lack of bottles, lack of cover, overload and other protection alarm devices. The performance is reliable, the process is scientific, the food hygiene conditions meet the national food hygiene standards, the production automation is high, and the operation is simple. The ideal hot filling equipment of choice for all types of soft drink manufacturers. It is commonly used in filling carbonated beverages, soda water, salt soda and other gas beverages. It can also be filled with various juices and pure water. It is a multi-functional automatic filling machine.
Beverage filling production line
Let me introduce the principle of the Fruit Juice Production Line filling machine:
Beverage line filling machine work can generally be divided into three steps: washing, filling, and capping. The three steps are completed on one machine.
The first step is to flush the bottle. The empty bottle reaches the vertical position with the curved stainless steel track. At this time, the bottle mouth is vertically downward, the machine runs, and there is a disk inside which will go to that position to start the flushing liquid. After arriving at the filling site, the beverage mineral water we drink has a small platform under the anti-theft ring. Generally, the diameter of the lid is the same. The platform is just stuck on the bottle, and the valve tube is just inserted in the bottle. After a certain distance, the valve plug is opened and the valve is opened and the can is started.
After the filling is completed automatically, the cam track down (there is a cam track inside) the bearing goes on (the cylindrical cam).
The last is the screw cap. The screw cap has a sensor. It also uses the bottle mouth. When you walk, it will scrape the sensor, and then blow a cover down to the flange. Grab the grip and screw it down to complete the filling.

Choosing the filling machine of Shanghai Jimei Food Machinery Co., Ltd., our equipment is simple, fast and simple, the whole process takes only a few seconds, and it is very stable, and the output of the product is also very large. At the same time, we are also a reliable partner of the Milk Processing Plant. We provide a complete range of equipment to meet your needs.

Tagged ,