Plastic PE sintered products for domestic

The application of PE sintered products in the field of life, the First category: fragrance absorbing tablets, aroma.therapy sticks, water-absorbing rings, and fragrance-diffusing balls; the Second category: painted pen tips; The third category: aquarium foamers; The fourth category: flowerpot water-absorbing sticks /Support frame: Fifth category: liquid mosquito coil; Sixth category: headset/microphone filter element; Seventh category: coffee machine filter element; Eighth category: sweeper filter element.

The plastic sintering process is primarily divided into four stages: raw material processing, molding, sintering, and post-processing:

1.​Raw Material Preparation and Mixing
​​Material Selection​​: Commonly used plastics include polypropylene (PP), polyethylene (PE), and polytetrafluoroethylene (PTFE), which must be ground into powder with a particle size of 10–200 microns.
Additive Formulation: Lubricants (e.g., zinc stearate), plasticizers, or reinforcing fibers (e.g., glass fibers) are added to improve flowability and final performance.
Mixing Uniformity: The mixture is thoroughly blended using a ball mill or vertical mixer to ensure consistent distribution of components.

2.Forming Process
​​Compression molding​​: Fill the mixed powder into a mold and cold-press it into a green body under 20–100 MPa pressure, suitable for simple geometric shapes (e.g., filter cores, cutting boards).
​​Injection molding​​: Mix the powder with a binder and inject it into a mold, suitable for complex structures (e.g., comb teeth, medical device components).

3.​Sintering process
​​Debinding Process​​: If a binder is used, it must be heated at 300–500°C to remove organic components.
​​High-Temperature Sintering​​: Heat and hold below the plastic's melting point (e.g., PTFE at approximately 380°C) to form a dense or porous structure through particle diffusion. Controlling the heating rate (5–10°C/min) and atmosphere (nitrogen protection) is critical.
​​Cooling and shaping​​: Slow cooling (≤5°C/min) to prevent internal stress cracking.

4.Post-processing and quality inspection
​​Machining: Cutting, grinding, or drilling to meet dimensional accuracy requirements.
​5Surface treatment: Coating (anti-soiling) or polishing to enhance aesthetics.
​​Performance testing: Testing porosity (for porous products), hardness (ASTM D785), and chemical resistance (e.g., acid-base immersion tests).