This guide has everything you need to know about screw feeders in packaging applications.
If you’re looking for the right screw bagging equipment for your packaging project or hoping to find a suitable machine to handle powder materials, you’ve come to the right place.
Table of Contents
As we all know, solid material can be divided into granular and powder materials depending on the size of the particles.
When we use traditional packaging machines to feed the powder material, it will often be clogged, resulting in the machine not operating correctly.
In addition, because the powdered material is light in weight, it is impossible to precisely control the weight of the feeding material, making the packing accuracy can not meet the requirements.
Therefore, to solve these problems, the screw feeder was invented, and the screw feeder became the best choice for handling powder materials.
To optimize the speed and precision of the packaging, we also developed the twin screw feeder.
▎1. What is the Screw Feeder
A screw feeder is composed of a screw and a pipe. The screw is a device in which metal pages are welded to metal bearings with uniform rotation and then will be mounted inside the pipe.
The material falls onto the screw bearing through the inlet, and the bearing is rotated by a motor, which drives the metal page to push the material forward evenly. We also call it Screw Auger Conveyor or Screw Conveyor.
Below is a drawing of the screw auger feeder. Through the drawing, we can find the advantages of the screw feeder: the material is driven forward by an external force, and the accuracy and speed of feeding are controlled by adjusting the spacing of the metal sheets.
In addition, because the material is moving inside the pipe, the closed pipe environment can effectively prevent the material from scattering into the air and polluting the environment, ensuring workers’ health and the environment’s cleanliness.
▎2. Custom Screw Feeder
For practical applications, we offer the service of customizing the screw feeder. It can provide the most suitable equipment for the client’s project. When designing a screw feeder, several influencing factors need to be considered:
● The liquidity, density, size of the particles, and other characteristics of the bulk material being handled need to be considered.
Handling different types of materials requires different types of screw feeders. For example, conveying larger size powder materials need horizontal screw bagging equipment; for conveying ultra-fine powder materials, it is recommended to use a vertical screw feeder.
If conveying food-grade materials, you need to use stainless steel material to manufacture the equipment. Still, to reduce the cost as much as possible, you can choose to use stainless steel for the material contact part and carbon steel for the rest.
● It is also necessary to consider the volume of material conveyed per unit time during the conveying process.
It determines the diameter of the pipe. The larger the volume of material conveyed per unit of time, the larger the diameter of the pipe and the larger the diameter of the spiral page.
● The speed of conveying material also needs to be considered.
The faster the speed, the higher the power motor. However, we should notice that high speed means a more significant impact on the material of the spiral blade, which will lead to increased wear of the blade and pipe, affecting the service life and metering efficiency of the screw feeder conveyor. Therefore, you need a professional packaging engineer to evaluate and determine your conveying speed.
● The overall length and inclination angle also needs to be considered.
Generally, the site situation is complex. We must design the height of the equipment, the angle of inclination, the power required, the thickness of the blades, the thickness of the pipe wall, and other parameters according to the space size requirements of the site.
▎3. What is the Screw Bagging Machine
The screw feeder is widely used and has many applications in the packaging industry. The screw feeding way belongs to one of the 3 basic feeding methods. The other two are belt feeding and gravity feeding.
We often call the bagging machine equipped with a screw feeder the screw bagging machine, screw packaging scale, or weight screw feeder. It is packaging equipment composed of a hopper, screw, bag clamping system, weighing system, electric control system, conveying system, dust removal system, and other parts.
It integrates the functions of storing, feeding, bag clamping, weighing, conveying, control, and dust removal in one, which belongs to the automatic packaging equipment.
We can find the screw feeder bagger in many different industries.
For example, in the food industry, conveying flour, milk powder, and other powder materials with screw feeders; in the chemical industry, conveying some chemical powder materials with screw feeders; in the construction industry, conveying cement, sand, and other construction materials, etc.
You will find that the screw feeder bagging machine plays an important role in almost all manufacturing industries.
▎4. Types of Screw Feeders in Packaging Industry
We have also developed different screw packaging equipment to meet different packaging needs.
About Screw Feeder Hopper
4.1 Net Weight Screw Bagger
The net weight screw bagger is equipped with a weighing screw feeder hopper. When the screw conveys the material into the weighing hopper, the material reaches the preset weight value and flows into the open-mouth bag. The bag clamping mechanism does not have a weighing function.
These products have better accuracy and faster packing speed. Still, because of the added hopper, the overall size of the equipment is higher, so it will require the height of the site environment.
4.2 Gross Weight Screw Bagger
In contrast to the net weight screw scale, the gross weight screw scale is not equipped with a weighing hopper. Its weighing system is integrated into the bag clamping mechanism.
Where the screw feeds the material directly into the bag and the weighing system works simultaneously. When the material reaches the preset weight value, the clamping mechanism will release the bag, and the bag falls on the conveyor belt.
The overall size of these products is shorter, which can meet the vast majority of production environments and is also more favorably priced.
About Screw Feeder Quantity
4.3 Twin Screw Feeder
As the name describes, we have equipped it with two screw feeders, a large one and a small one. The twin screw feeder is our standard solution for handling powder now.
The twin screw feeder increases the feeding speed and accuracy.
At the beginning of the feeding process, two screws work together to feed 2.5 times faster than a single screw. When it comes to the end of the feeding, the big screw stops running, and the small one controls the feeding separately to ensure accuracy.
About the Packaging Site
4.4 Inclined Screw Feeder
Many customers have requested to upgrade their production plants by adding packaging machines to their existing facilities. So, many pipes and other equipment take up a lot of space, limiting the new equipment.
Therefore, we have developed the tilting screw bagging scale. It can avoid the limitation of space height on the equipment.
About Superfine Powder
4.5 Vertical Screw Feeder
About the powder material, we can divide them into powder and superfine powder according to the diameter size of the particles. Because the superfine powder material is so small, it has a high air content and tends to raise dust on the way of feeding.
The vertical screw feeder packaging machine is also known as the bottom-fill packaging machine. In the beginning, the vertical screw will reach the bottom of the open-mouth bag, start feeding, and slowly lift the screw upwards.
And the vertical screw feeder is surrounded by a dust removal system that will automatically absorb the dust raised.
Using vertical screw packaging equipment ensures a clean environment and high precision. It is very suitable for packing ultra-fine powder materials.
▎5. Final Thought
Wxtytech is a professional screw feeder manufacturer, and we offer custom strand feeder designs.
We hope you enjoyed our ultimate guide on screw feeders. What do you think of this guide?
Maybe you still have questions about the screw feeder or have a packaging project that requires purchasing the screw feeder.
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