welcome to leizhan.
welcome to leizhan.
D‑Type vs Medium vs High‑Consistency Hydrapulper
Hydraulic pulper is one of the core and most commonly applied pulping equipment in the pulp and paper industry. Whether it is processing waste paper, crushing pulp boards, or recycling broken paper, the hydraulic pulper is the starting point of the entire pulping production line. Its main function is to decompose waste paper, pulp board, broken paper and other raw materials into fiber suspension under the combined action of hydraulic and mechanical force.
Hydrapulper Details
| Aspect | D‑Type Hydrapulper | Medium‑Consistency Hydrapulper | High‑Consistency Hydrapulper |
|---|---|---|---|
| Operating Consistency | 3% – 5% (low consistency) | 5% – 8% | 10% – 15% (up to 35%) |
| Structural Features | D‑shaped tank; breaks traditional circular flow, directs stock toward centre, increases impeller impacts | Vertical or horizontal; double‑spiral drill‑type rotor; adjustable rotor‑screen clearance | Vertical design; multi‑blade spiral or tower rotor; generates strong vortex circulation |
| Defibering Principle | Hydraulic shearing + mechanical friction; defibering efficiency ~30% higher than round tanks | High‑intensity vortex circulation; thoroughly defibers while minimising fiber cutting | Intense fiber‑to‑fiber friction, tearing and rubbing at high consistency; gently removes ink without breaking impurities |
| Main Suitable Raw Materials | Waste paper (OCC, old books, mixed office waste), pulp boards, broke | Clean raw materials: wood pulp | Deinking pulp (newsprint, magazines, office waste containing ink) |
| Advantages | High efficiency, large output, compact design; suitable for large‑scale continuous production | Less fiber damage, lower energy consumption; continuous operation | High ink removal, good fiber strength retention, impurities not broken – easy for subsequent cleaning |
| Disadvantages | May break light impurities, increasing screening load | Not suitable for heavily contaminated or deinking waste paper | Mostly batch operation; higher investment and energy consumption |
| Typical Applications | Packaging paper, corrugating medium, cultural paper – conventional waste‑paper pulping lines | Pulping of unbleached/bleached pulp boards; continuous pulping for clean stock | Deinked pulp (DIP) lines for newsprint, cultural paper, tissue |
| Operation Mode | Continuous or batch | Mainly continuous | Mainly batch |
As the “first hurdle” in pulping and papermaking, the performance of the hydrapulper directly affects the quality and efficiency of subsequent screening, purification, and papermaking processes. From traditional mid-consistency pulping to high-consistency deinking, and from circular tanks to D-type high-efficiency structures, hydrapulper technology has continuously evolved.
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