i-OCC stock preparation system

Yunda i-OCC stock preparation system has the advantages of high yield, high quality, high reliability and low energy consumption. The system realize the idea of less intermediate stock chests, which can save appx. 20% of the floor spaces; using of the eco-jet mixing technology provides lower investment, lower energy consumption and lower maintenance cost; group start / stop provides easy operations.

The waste paper after bale breaking goes evenly into the Drum Pulper with less hits, accelerated water absorption and increased pulping efficiency. with fully disintegration by rubbing, The stock will be diluted to a lower consistency of 3 - 5% by the spraying water coming out of the shower pipe in the screening section. The accepted stock goes through the screen holes. And the impurities such as waste plastics are discharged from the reject end. The stock in the bottom vat of the Drum Pulper is pumped into the Two Stages HD Cleaner，the accept from the 1st stage goes into the Dump Tower and the Reject is collected in the Settling Tank and will be pumped from the top to the second stage for further cleaning. Accept of the 2nd stage is led back to the Pulper and the heavy contaminants is dumped to the sand separator to collect the sands from water.

The stock after the Dump Tower is pumped into the Coarse Screening System, Reject of the first stage goes to the 2nd stage via one eco-jet mixer directly, And reject of the 2nd stage goes further though a Float Purger and a Reject separator, finally the light impurities collected for further treatment. Accept goes to the fractionation system and after that short fiber goes after thickening to the storage tower.

Long fiber enters the LC Cleaner plant in 4 stages design; light particles was removed by centrifugal forces; In the fine screening stage Oda screen basket provides high stickies removal efficiency, high throughput, and energy-saving; The final stage of the fine screen has additional under the rotor dilution which helps to either reduce excessive thickening of the reject inside the screen basket or clean the impurities completely, accepts from different stages are all going forward and combined together and fed into the Long Fiber Disc Thickener.

The long fiber mat is knocked off by the knock-off shower and then enters the Disperser through Screw Press, Plug Screw, Shredding Screw, Heating Screw for further treatment. after that the stock is conveyed to the long fiber storage tower and will be further refined by the Double Disc Refiner, Yunda PM Double Disc Refiner is reliable, energy-saving and high quality of beating.

i-OCC is not only good in stock preparation but also good in reject handling, which it provides human-machine harmony, green and environment friendly, and is the priority for OCC treatment.

1.i-OCC Recycled Fiber Technology

OCC/mixed waste paper main components :

• 1.Fiber and Debris ,Ash.
• 2.Rejects( Plastics,Wires & Strings,Metals,Non-Ferrous Metals,Sand, Stone & Glass,Stickies...)

In OCC Stock Preparation:

• To Retain as much Fiber as possible (High Yield);
• Typical System Losses: Fiber ≤2.8%, Debris ≤6.5%;
• To Retain certain amount of Ash;
• To Remove as much Rejects as possible;
• Typical Stickies Removal Efficiency: ≥90%;

Proper Reject Sorting and Treatment is not only a way of being Environmental Friendly but also Brings good Margins…
For Details of the Reject Handing System please Contact Yunda!

The general process

2.i-OCC Systems & Equipment

Hydraulic pulping system

	A	B	C	D	E	F	Duration
Extraction	O	C	C	C	C	O	8 min
Defibering	C	C	C	C	C	O	2 min
Washing I	O	C	C	C	O	O	15 sec
Washing II	O	C	O	C	O	C	60 sec
Washing III	C	O	O	C	O	C	60 sec
Rejecting	C	C	O	C	O	C	75 sec
Heavy Rejecting	C	C	C	O	C	C	5 sec
O=Open; C=Closed;Total Sequence Time is 13.5 min;

D-Shaped Hydraulic Pulper

D-Shaped vat design allows smaller vat and lower power requirements for a given application:

• Lower initial capital investment;
• Less floor space requirements;
• Better auxiliary equipment layout;
• Lower operating costs;
• Quicker return on investment;

“R” Raised rotor design provides:

• Better heavy rejects handling;
• Better rag rope operation;
• Longer rotor and extraction plate wear life;

Extended and large hole extraction plate provide:

• Maximum extraction open area and hydraulic capacity;
• Low extracted stock velocity;
• Low the discharge time;
• Less rag breakdown;

• Deflaking efforts;
• Minimum fiber loss;
• High reject load permitted;
• No separate pump is needed;
• Less maintenance requirement;

Super Screen (For 1st & 2nd Stage Coarse Screen)

• Up streaming, heavy rejects will be removed from the bottom directly;
• Reduced wearing, reduced power consumption;
• Light Material, such as Styrofoam, rises naturally through screening zone to reject stream;
• Highest accept cleanliness;
• High yield;
• Defibering of remaining flakes in the stock from the pulper;
• No size reduction of contaminants;
• High reject consistency;
• Low maintenance cost;

Fiber Sorter (For 3rd Stage Coarse Screen)

• Deflake flakes to prevent loss of usable fiber; Deflaking efficiency up to 80%;
• Hydraulic separation of contaminants from flakes and fiber;
• Concentrate contaminants for tailing unit;
• Continuous light reject flow;
  

Reject Sorter(For 4th Stage Coarse Screen)

• Deflake flakes to prevent loss of usable fiber;
• Simple operation;
• No pressure;
• No fiber in the reject;
• Fit for various capacity;
• Simple operation;
• Simple piping;

• For reject washing, to save fiber further;
• Fiber free in the discharge reject;
• Efficient light rejects removal;
• Less maintenance requirement;

Drum pulper - gentle pulping principle

Gentle defiberizing of furnish with specially shaped internals
Lifting plates in staggered arrangement = constant, smooth stock falling and tumbling;
Stock moves slowly towards the screening section due to the drum declination;

• No Cutting Forces, No Aggressive Shearing;
• Minimum Breakdown of Contaminants;
• Maximum Retention of Fiber Physical Characteristics;
• Lowest Power Consumption;
• Minimum Maintenance Requirements;
• Excellent Quality Stock;
• Enables All Grades of Recycled Furnish;
• Continuous Operation & Trouble Free Production;

3.i-OCC Major Installations & References

Jiangsu Jintian

Zhejiang Jinli Paper Project