Vacuum shaping packaging for powders is a professional process integrating technical specifications and industry adaptability, focusing on the precise matching between powder characteristics and packaging technology. The following is a popular science explanation from key dimensions.
Core Technology
The technical core centers on two key links: degassing and shaping. The degassing process adopts a two-stage vacuum design. First, pre-evacuate to -0.06MPa to remove free air, then eliminate interstitial gas through screw extrusion and negative pressure adsorption at -0.095MPa, achieving a degassing efficiency of over 98%. Shaping relies on six-sided mold positioning and vibration assistance, increasing the bulk density of powders by 30%-50% to form regular cuboid or cube shapes. Vibration frequency must be controlled to avoid powder stratification.
Application Scenarios
Application scenarios have clear industry boundaries. The new energy field adapts to ultra-fine powders with particle size ＜10μm such as ternary lithium and lithium iron phosphate. The food industry covers easily airborne materials like coffee powder and mushroom compound seasoning powder. The chemical industry applies to metal powders, masterbatches, etc. The pharmaceutical industry targets additives, medicinal powders and other materials requiring GMP standards. Different scenarios need matching process parameters-for example, flammable powders require anti-static grounding and inert gas protection systems.
Operational Specifications
Operational specifications include strict process requirements. Before startup, check vacuum pump connections, seal integrity and material dryness to prevent caking from affecting packaging results. Parameter settings should be adjusted according to powder characteristics: vacuum degree is usually controlled at -0.08~-0.1MPa, sealing temperature at 120-180℃, and sealing time at 1-3 seconds. Daily maintenance involves cleaning the hopper and vacuum chamber daily, and calibrating pressure sensors and metering systems regularly to prevent equipment failures caused by powder residue.
Material and Equipment Standards
Materials and equipment have specific adaptation standards. Parts in contact with materials must use 316L stainless steel or food-grade PTFE coating to avoid corrosion and residue. Packaging films should have good barrier properties and puncture resistance. Equipment needs to integrate negative pressure sealed chambers and pulse backblow dust removal systems to control dust leakage below 1mg/m³.
