Medium Consistency Pressure Screen

The medium-consistency pressure screen is a key screening device in the pulping and papermaking process, mainly used for pulp purification at medium consistency. It effectively removes impurities and protects downstream equipment, while reducing energy consumption and fiber loss. It is widely applied in chemical pulp, mechanical pulp, and recycled pulp production lines.

Yunda’s ZNS Series Midium Consistency Pressure Screen is used for coarse screening, fractionating screening and fine screening in the pulping process. They provide excellent screening efficiencies at significantly lower pulse rates.

Features:

• Multiple Wing Blocks Design for untwisting , gentle pulsating action. Yields clean stock, high pulsation frequency and large capacity.
• Screening under Mid consistency (C <= 4%), reduced water consumption during operation at an obvious energy saving outcome.
• Smaller basket profile without losing design capacity.
• Lower consistency for increased, high screening efficiency extending the overall life of the basket.
• Equipped with an automatic lubrication device and mechanical water seal adapted with a custom monitoring and alarming device.
• Reserved DCS interface (detecting bearing temperatures).

Technical Data:

Model	ZNS80	ZNS81	ZNS82	ZNS83	ZNS84	ZNS85	ZNS86	ZNS875	ZNS87	ZNS88	ZNS89
Nominal Area (㎡)	0.25	0.38	0.76	1.06	1.42	1.88	2.27	2.95	3.54	4.83	6.44
Inlet Consistency (%)	1—4
Capacity-Hole (T/D)	30-40	50-80	90-160	135-250	180-320	220-420	260-500	300-600	400-700	500-1000	800-1500
Capacity-Slot (T/D)	20-30	30-50	60-100	90-150	120-190	150-210	200-300	250-400	300-450	320-730	500-1100
Inlet Pressure (MPa)	0.2-0.4
Motor Power (kW)	15-22	11-37	22-75	30-90	37-110	25-132	55-160	75-200	75-220	132-280	250-400

Applications：

• Impurity Removal: Filters and removes large impurities from the pulp, such as plastics, metal fragments, stones, undispersed wood chips, and fiber bundles.
• Pulp Purification: Improves pulp cleanliness, ensuring the stability of subsequent refining, bleaching, and papermaking processes.
• Equipment Protection: Reduces damage and clogging caused by impurities to downstream equipment, such as refiners, pumps, bleaching towers, and paper machines.
• Product Quality Control: Removes impurities and unqualified fibers, improving the surface quality and physical properties of the paper.

Advantages：

• High Efficiency：Operates under medium-consistency conditions, maintaining high throughput while reducing dilution water usage.
• Low Energy Consumption：Compared with low-consistency screens, medium-consistency pressure screens eliminate additional dilution and thickening stages, thereby lowering overall energy consumption.
• Minimal Fiber Loss：With optimized screen basket design, it efficiently removes impurities while retaining high-quality fibers, minimizing fiber loss.
• Stable Operation：The automatic reject discharge system effectively removes impurities, reducing manual cleaning frequency and ensuring long-term stable operation.
• Low Maintenance Cost：Long service life of the screen basket, compact structure, and easy maintenance.