TPU Polymer Powder Sieving Machine

TPU polymer powder is a polymer material with excellent elasticity, wear resistance, oil resistance and low temperature performance, which is widely used in 3D printing, coatings, footwear, medical devices and other fields. TPU polymer powder sieving machine is a mechanical equipment specially used for particle size classification, impurity removal or particle homogenization of TPU polymer powder. Its design features fully consider the physical and chemical properties of TPU powder. Its main function is to screen out substandard particles (too large or too small) to obtain TPU powder with more uniform particle size and purity.

TPU Polymer Powder Sieving Machine video

How does the TPU polymer powder sieving machine work?

The ultrasonic sieving machine solves the problem of TPU powder sieving through the synergistic effect of mechanical vibration and ultrasonic vibration. Its working process is as follows:

① Material input: TPU powder is evenly fed into the sieving machine through the feed port, usually placed on the top screen surface.

② Mechanical vibration: The vibration motor generates three-dimensional movement (horizontal, vertical and inclined vibration) to disperse and move the TPU powder on the screen. Mechanical vibration pushes larger particles to the edge of the screen, and fine particles pass through the screen aperture to achieve preliminary classification.

③ Ultrasonic vibration: The ultrasonic generator generates a high-frequency electrical signal (20-40kHz), which is converted into mechanical vibration through the transducer and acts on the screen.

④ Particle size classification and collection: According to the number of screen meshes (for example, 200 mesh corresponds to 75 microns, 325 mesh corresponds to 45 microns), TPU powder is divided into different particle size intervals:

Powders smaller than the screen aperture pass through and fall into the lower collection plate.

Particles larger than the aperture remain on the screen and are discharged through the discharge port.

What are the advantages of the TPU polymer powder sieving machine?

Solve the problem of TPU polymer powder softening due to heat sensitivity: The glass transition temperature (Tg) of TPU is low (about -30℃~50℃), and the friction heat generated by screening may cause the particles to soften and stick together. The low-speed design is adopted to reduce the heat generated by mechanical friction. A water-cooled jacket or air-cooled device can be optionally equipped to control the screening temperature to <40℃.

Solve the problem of TPU polymer powder easily agglomerating and sticking to the screen: TPU has a certain viscosity and is easy to agglomerate under high humidity or temperature conditions. The powder sticks to the screen, affecting the screening efficiency. The TPU polymer powder sieving machine breaks the adhesion force through 20-38kHz high-frequency vibration.

Deal with the problem of uneven particle size distribution of TPU polymer powder: The traditional perforated screen has a large error (±10μm), which affects the batch consistency of 3D printing or medical powder. Use high-precision electroformed screens, laser-cut or electroformed screens, with an aperture error of ≤±2μm (such as 325 mesh/45μm screens).

Dealing with the problem of ultrafine powder (<50μm) flying and difficult to screen: Traditional vibrating screens have extremely low screening efficiency for <50μm powders (mesh penetration rate <30%), and are prone to dust pollution. Apply negative pressure under the screen to enhance the ability of ultrafine powder to penetrate the screen. Use a three-stage cascade screen of 20 mesh → 100 mesh → 325 mesh to gradually grade and improve efficiency.

Recommended mesh number of TPU polymer powder sieving machine

Coarse screen (100-150 mesh): used for preliminary screening to remove large particles of impurities or agglomerates, you can use a lower mesh number, such as 20 mesh to 60 mesh, suitable for industrial parts, shoe materials and other scenes with low precision requirements.

Medium screen (150-250 mesh): for general powder classification, you can use 150 mesh to 250 mesh. Suitable for coating, shoe materials or recycling scenarios, balancing particle size uniformity and production efficiency.

Fine sieve (250-400 mesh): 200 mesh or even higher is required for screening very fine powders. TPU powder can even pass through a 325 mesh (44 micron) sieve, which is used in high-precision scenarios such as 3D printing and medical treatment to ensure fine particle size and high-quality surface.

Comparison between TPU polymer powder sieving machine and traditional sieving equipment

What can TPU polymer powder sieving machine be used for?

TPU polymer powder sieving machine has a wide range of application scenarios. Its core function is to optimize its performance in downstream applications through precise particle size classification according to the characteristics of TPU powder, and ultimately improve the quality and function of the product.

Coatings and adhesives: The particle size of TPU powder directly affects the leveling, adhesion, surface finish of the coating, and the bonding strength and uniformity of the adhesive. The sieving machine can obtain powders with a specific particle size range to meet the requirements of coating and adhesive performance for different applications.

3D printing: In order to ensure uniform powder spreading during the printing process and the quality of the final product, the particle size distribution of TPU powder needs to be precisely controlled. TPU polymer powder sieving machine is used to remove particles that are too large or too small to ensure the stability of the printing process and the density, strength and surface quality of the printed parts.

Elastomer and seal manufacturing: In order to ensure the physical and mechanical properties of the final product, the particle size of TPU powder needs to be controlled to ensure uniform melting and mixing of powder during molding processes such as molding and extrusion. The sieving machine can remove coarse particles or impurities that affect the molding quality.

Cosmetics and medical: There are strict requirements for the purity and particle size of TPU powder to ensure the safety and effectiveness of the product. TPU polymer powder sieving machine can remove impurities and obtain TPU powder of the required particle size to ensure the quality of the product.

TPU polymer powder sieving machine solves the problems of material viscoelasticity, static electricity and thermal sensitivity through targeted design, and is a key equipment to ensure powder quality. When selecting a model, it is necessary to comprehensively consider the particle size range, output and process environment to ensure screening efficiency and product consistency.