The screw types of powder feeding machine

About Screw Types
The type of screw (helix) used in a screw feeder depends on its purpose and usage, but generally includes the following
1. simple helix: This is the most basic type, having a series of continuous helical shapes. This type is suitable for transferring powder or particulate materials. 2.
2. core-type helix: A hollow helix with an interior space. This type of screw is suitable for transporting highly viscous liquids and mixtures. The cavity can also be fitted with heating or cooling elements to heat or cool the material. 3.
3. shaftless helix: This type of screw has no shaft around the screw and is hollow inside. This design facilitates cleaning and material mixing. 4.
4. ribbon helix: A wide helix, suitable for gently mixing materials. It is often used to transfer highly viscous materials or fragile particles. 5.
5. wavy helix: A helix with a wavy shape, which helps to transfer material more evenly. They are especially used for mixed materials or when uniform discharge is required.
These types may be customized for industrial applications and process requirements. Depending on the screw feeder design and usage, the appropriate screw type is selected.
Of these, the most common in our company are simple helix or shaftless helix types. Let us explain the two main types.

Shafted screw
The simple helix is one of the most basic screw (helix) types used in machines such as screw feeders. This type of screw has a series of continuous spirals and is used to transfer material.A simple helix generally has the following characteristics:
1. linear design: Spirals have a constant linear shape and are suitable for moving material in one direction. This allows for efficient feeding and discharging of material.
2. continuous helix: The screw has a series of continuous helical shapes. This allows for uniform material transfer.
3.Versatility: The simple helix is suitable for transferring a wide variety of materials. Powders, granules, liquids, and other materials of various shapes and properties can be handled.
4. easy manufacturing and maintenance: The simple structure makes manufacturing and maintenance relatively easy. Parts can also be replaced and repaired relatively easily.
Simple spirals are widely used in industrial applications and manufacturing processes. For example, they are utilized in conveyor systems, material transfer equipment, raw material and product feeders, and many other applications.

Shaftless screw
Shaftless screws, on the other hand, are widely used in industrial applications and manufacturing processes. For example, they are used in conveyor systems, material transfer equipment, raw material and product feeders, and many other applications.
Due to their characteristics, shaftless screws are particularly suitable for transferring the following raw materials and materials
1. viscous liquids: The hollow interior of the shaftless helix makes it ideal for transferring highly viscous liquids. Examples include various types of pasty materials and molten plastics.
2. non-uniform mixtures: The shaftless helix is also suitable for transferring mixtures that are not uniform in internal structure, as well as materials of different particle sizes and densities. Examples include ore mixtures and mixtures of plastic and rubber materials.
3. sensitive raw materials: The risk of material damage is low with shaftless spirals because there is no shaft inside. It is therefore suitable for transferring relatively sensitive raw materials and fragile particles. Examples include powder-liquid mixtures and special chemical products.
4. hot and cold materials: The shaftless helix is also suitable for transferring hot and cold materials, since heating and cooling elements can be mounted inside. Examples include molten plastics and frozen foods.
Thus, the shaftless helix is better suited for transferring raw materials and materials with specific requirements than other types of screws, such as highly viscous liquids and non-uniform mixtures.

Accuracy
A comparison of the accuracy of a shaftless helix versus a simple helix is that the simple helix is generally considered more accurate. This is because a simple helix has a shaft attached to the helix, which makes the material transfer more stable and the transfer more predictable.

On the other hand, a shaftless helix has no shaft inside and therefore has certain instability factors in material movement. Especially when handling highly viscous liquids or non-uniform mixtures, the shaftless helix can affect the flowability of the material. Therefore, a simple helix may be preferred when highly accurate movement is required.

Generally, we first conduct trials with standard screws and make the best proposal to our customers based on the results.

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