1. Core raw materials ne pretreatment a wɔde yɛ filter nneɛma .
1). Nneɛma a wɔde yɛ nhama: Ɛsɛ sɛ wɔma nhama a wɔayɛ te sɛ polypropylene (PP) ne polyester (PET) no yow (nsu a ɛwɔ mu no nnu anaasɛ ɛne no yɛ pɛ 0.1%), na ɛho hia sɛ wɔtew abɔde mu nhama te sɛ kotoku ne nwi no so na wɔde kum mmoawa.
2). Nneɛma a ɛyɛ granular: Activated carbon, quartz anhwea, ne nea ɛkeka ho hia sɛ wɔde sieved na wɔde graded (particle size range 0.5-5mm), na diatomaceous earth hia sɛ wɔde calcin wɔ ɔhyew a ɛkorɔn (800℃) na ama porosity akɔ soro.
3). Composite substrates: Sɛ nhwɛso no, PTFE coated filter materials hia sɛ wɔde plasma yɛ wɔ base ntama no so na ama adhesion (peel ahoɔden akɔ soro anaasɛ ɛne 15N/cm ayɛ pɛ).
Ɛsɛ sɛ wɔhwɛ nneɛma a atwa yɛn ho ahyia a ɛyɛ nwini (RH a ennu anaasɛ ɛne 40) so no so denneennen wɔ bere a edi kan no mu na ama wɔakwati nsakrae a ɛba nneɛma mu. Sɛ nhwɛso no, ɛsɛ sɛ melt index a ɛwɔ polypropylene fiber a ɛwɔ 160-180℃no mu no gyina hɔ pintinn wɔ 25-35g/10min (ASTM D1238 gyinapɛn).
2. Ntotoho a ɛfa nneɛma a wɔyɛ no titiriw ne mfiridwuma ho nsɛm ho .
1). Meltblown nhyehyɛe .
- Adeyɛ: Polymer a ɛreyow → Ɔsoro-Pressure airflow spinning → fiber mesh a ɛyɛ .
- Nsɛmfua titiriw: Spinneret kɛse 0.2-0.4mm, mframa a ɛyɛ hyew hyew 230-280℃, fiber diameter 1-10μm .
- Application: Production of high-efficiency and low-Resistance filter nneɛma (filtration efficiency 99.9% @0.3μm, resistance a ennu anaasɛ ɛne 50PA yɛ pɛ) .
2). Needle punching nhyehyɛe .
- Process: Fiber Laying → Multi-Needle plate puncture (needle frequency 800-1200 times/min) → Reinforcement into felt
- Mfasoɔ: ɛtumi ma nneɛma mmiɛnsa-afã a ɛwɔ afiri a wɔde yiyi mu, gram mu duru 100-800g/m2, mframa a ɛtumi fa mu 5-20cm3/cm2/s .
3). Sintering nhyehyɛe .
- dade/ceramic filter nneɛma hia sɛ wɔde mia powder (pressure 20-50MPa) na afei wɔde sintered wɔ ɔhyew a ɛkorɔn mu (1100-1300℃ma stainless steel ne 1600℃ma alumina) .
- porosity no betumi adi so wɔ 30-60%, na ɔhyew a ɛko tia no boro 500℃.
3. Post-Nneɛma a wɔyɛ ho adwuma ne adwumayɛ a ɛyɛ papa .
1). Nsakrae a ɛba wɔ soro: .
- nsuo a ɛyɛ hu (te sɛ fluorocarbon coating contact angle a ɛboro anaa ɛne 120 digrii yɛ pɛ ) .
{0}} Antibacterial awieɛ (Dwetɛ ion a ɛde 0.5-2%) .
2). Nneɛma a wɔde hyɛ mu den:
- ultrasonic welding (frequency 20kHz) na ama seam ahoɔden atu mpɔn .
- Hot calendering treatment a ɛbɛma pore size distribution no ayɛ pɛpɛɛpɛ (CV bo a ɛsom no sua sen anaasɛ ɛne no yɛ pɛ 15%).