Plastic Dryer
Plastic Dryer
Multiple domestic factories for bidding. Free promotion. Price to be negotiated between winning bidder and buyer.
Please provide below information for posting:
- Model or functional requirements; 2. Drying method: hot‑air type, dehumidifying type, oven type; 3. Drying capacity; 4. Purchase quantity
表格
| Type | Working Principle | Core Advantages | Main Limitations | Typical Application |
|---|---|---|---|---|
| Hot‑Air Dryer | Heated air is blown from the bottom of hopper by fan, flows upward through raw material, carries away moisture and exhausts from the top https://www.feijiu.net/toutiao/article/14099.html. | Simple structure, cost‑effective, easy operation & maintenance; most widely‑used drying solution. | Drying performance heavily affected by ambient humidity; unstable dew point; only for non‑hygroscopic materials. | Non‑hygroscopic plastics such as PS, PP, PE; general products with low moisture requirement. |
| Dehumidifying Dryer | Air is dehumidified to low dew point (below ‑40 ℃) via molecular sieve or rotary desiccant wheel, then heated and fed into hopper for material drying. | Stable drying performance independent of ambient humidity; handles highly‑hygroscopic materials; ensures bubble‑free products with high mechanical strength. | Higher equipment cost, relatively high energy consumption; desiccant needs regular replacement or regeneration. | Hygroscopic materials: PA, PC, ABS, PET, PMMA; optical‑grade and precision injection‑molded parts. |
| Compressed‑Air Dryer | Factory compressed air is pressure‑regulated and heated before entering drying hopper; low‑dew‑point dry air is obtained through pressure reduction and expansion. | Compact structure, plug‑and‑play, simple maintenance; no separate dehumidification unit; suitable for small‑to‑medium batch drying. | High operating cost due to compressed‑air consumption; limited throughput; not fit for mass production. | Small‑medium batch production, frequent grade change‑over, laboratory or machine‑side drying. |
| Vacuum Dryer | Material is heated under vacuum environment; negative pressure lowers boiling point of water to realize fast low‑temperature drying. | Fast drying cycle; prevents thermal degradation for heat‑sensitive materials. | High capital investment; batch‑type operation with limited throughput. | Heat‑sensitive engineering plastics, high‑value materials, laboratory R&D. |
| Microwave / Infrared Dryer | Microwave or infrared radiation directly heats internal moisture inside pellets for rapid drying. | Ultra‑fast drying speed, high energy efficiency. | High equipment cost; risk of material degradation; limited industrial adoption. | Special materials and high‑end applications. |
Hygroscopic vs Non‑Hygroscopic: critical basis for selection. ‑ Non‑hygroscopic plastics (PP, PE, PS): moisture only adheres to pellet surface; hot‑air dryer is sufficient. ‑ Hygroscopic plastics (PA, PC, ABS, PET): moisture penetrates into pellets; dehumidifying dryer is mandatory for satisfactory drying result.
Core Specifications: Hard Indicators for Selection
Loading Capacity (kg): Maximum material weight the hopper can hold, core index for production scale. Range: Lab‑grade 12 kg(DATD‑12), 25 kg, 50 kg; medium‑production 100 kg, 200 kg; central large‑system 600 kg, 800 kg, above 1200 kg. Selection tips: Determined by hourly consumption of injection/extrusion machine plus required drying time. Rule of thumb: hopper capacity ≥ hourly material consumption × drying time(hour).
Heating Power (kW): Determines heating capacity and temperature‑rising speed. Range: Small unit 1.8‑3 kW (12‑50 kg); medium unit 4.5‑9 kW (75‑200 kg); large unit 15‑30 kW (300‑800 kg). Reference: Higher power brings faster heating yet higher energy consumption; must match hopper loading capacity.
Fan Power (W): Affects hot‑air circulation efficiency and drying uniformity. Range: 50 W(12 kg); 120‑180 W(25‑100 kg); 300‑550 W(150‑300 kg); 750‑1100 W(400‑800 kg). Reference: Sufficient air volume to penetrate material bed; avoid excessive air flow causing dust flying.
Dry Air Volume (m³/h): Key parameter for dehumidifying dryers, represents dehumidification capability. Range: 55 m³/h, 75 m³/h, 100 m³/h (KKT series). Reference: Match air volume according to hopper size and material characteristics.
Max Drying Temperature (℃): Maximum achievable temperature, defines processable material scope. Range: General‑purpose 120‑160 ℃; high‑temperature model 180‑200 ℃. Reference: Max temperature shall exceed material recommended drying temperature (e.g. PC 120 ℃, PET 160 ℃).
Dew Point (℃): Core performance index for dehumidifying dryers, indicates air dryness. Range: High‑quality dehumidifier reaches ‑40 ℃ ~ ‑65 ℃. Reference: Lower dew‑point equals stronger dehumidifying performance. For highly‑hygroscopic materials, dew‑point ≤‑40 ℃ is required.
Power Supply (V/Hz): Shall match factory power grid. Common specs: Small units 220V single‑phase; medium‑and‑above units 380V three‑phase.
Selection Guidelines
Follow clear logic for plastic dryer selection: ‑ Determine dryer type by raw material: Non‑hygroscopic materials (PP/PE/PS): choose hot‑air dryer for best cost‑performance. Hygroscopic materials (PA/PC/ABS/PET): dehumidifying dryer is mandatory to guarantee drying quality. Small‑medium batch & frequent grade change‑over: compressed‑air dryer for high flexibility. Heat‑sensitive & high‑value materials: vacuum dryer to avoid thermal degradation.
‑ Determine hopper capacity by throughput: Calculate required hopper volume based on hourly consumption and required drying time, select corresponding model.
‑ Determine model by temperature requirement: Check material recommended drying temperature (Nylon 70‑75 ℃, PC 100‑120 ℃). Ensure equipment max temperature has 10‑20 ℃ safety margin.
‑ Configure according to drying‑quality requirement: For strict drying requirement, prioritize dehumidifying dryer with dew‑point ≤‑40 ℃. For energy‑saving demand: select energy‑saving version with thermal insulation, hot‑air recovery and sleep mode. For precise control: choose micro‑computer PID temperature control, dew‑point monitoring and built‑in material database.
‑ Consider peripheral matching & future expansion: Dryers are often combined with auto‑loader, dehumidifier and central conveying system. Check interface compatibility and expandability during selection.
Participation Process
Manufacturers: Contact supplier service for supply registration.
Buyers: Click group‑purchase or contact procurement service to submit requirements. The platform filters suppliers from database or releases bidding based on aggregated demands. Buyers select competitive suppliers and sign sales contracts.
