Abrégé

The present invention relates to a process for manufacturing a Yankee cylinder. The process comprises welding the first reinforcement flanges of two workpieces of Yankee cylinder section from inside of the cylinder case, preheating and welding the two workpieces of Yankee cylinder section from outside of the cylinder case, and then removing the first, second reinforcement flanges, radial inner end area of the weld and their surrounding material in the workpieces of the Yankee cylinder section, so that the joint of the two workpieces of Yankee cylinder section is machined to meet the final dimension requirements for the Yankee cylinder inner grooves. The present invention is also related to a workpiece of Yankee cylinder section used in the said process.

Classes IPC  ?

• D21F 5/02 - Séchage sur cylindres
• B23K 26/24 - Soudage de joints continus

Abrégé

A pulp screening machine has screen extending upward from the bottom of the pulp screening machine and a rotor which rotates around the outside of the screen. An accept outlet is provided inside the screen and a pulp outlet and reject outlet are provided outside of the screen. The rotor vanes of the rotor are cantilevered from the rotor base on top of the screen into the region of the screen, with the rotor vanes not being connected to each other in the region of the screen. The rotor vanes have a rigidity adaptable for de-flaking cooperatively with the outside surface of the screen.

Classes IPC  ?

• D21D 5/06 - Tambours épurateurs rotatifs

Abrégé

A screen plate for a pulp screening machine. On the side towards the rotor of the pulp screening machine, the screen plate has concave grooves. Except in the region of the grooves, an even gap is formed between the vane of the rotor and the surface of the screen plate, wherein the rotor vane front edge of the pulp screening machine is arranged at an angle to the grooves. Also, a pulp screening machine with the screen plate.

Classes IPC  ?

• D21D 5/04 - Épurateurs plats

Abrégé

A method for dilution for a pressure screen comprising a rotor rotating inside a screen a distance to the screen, includes supplying feeding stock into a screening zone formed in the spacing between the rotor and the screen with some of the feeding stock passing through the screen into an accept area to become accept, and the remaining feeding stock discharged into a reject area as reject flow. The amount of the dilution water added into the reject flow is 0.8 to 3.5 times the amount of the reject flow by volume. Additionally, a pressure screen comprises a dilution water adding apparatus adapted to add dilution water directly into the reject area of the pressure screen, wherein the amount of the dilution water added into the reject flow is 0.8 to 3.5 times of the amount of the reject flow by volume.

Classes IPC  ?

• D21D 5/06 - Tambours épurateurs rotatifs

Abrégé

A pulp pack scattering device (100) and a pulp pack scattering method, the pulp scattering device (100) being used for scattering a pulp pack (200) on a pulp pack transportation route (300). The pulp pack scattering device (100) comprises a pair of clamping plates (101); the clamping plates (101) are configured to be capable of clamping and lifting upwards the pulp pack (200) from two sides of the pulp pack (200), and enabling the two sides of the pulp pack (200) to move relative to one another. A movable friction portion (102) is provided on one side of at least one clamping plates (101) facing the pulp pack (200). The friction portions (102) are used for driving the two sides of the pulp pack (200) when the pulp pack (200) is clamped by the clamping plates (101). The pulp pack scattering device (100) may enable adjacent pulp packs of the pulp pack (200) to separate from one another.

Classes IPC  ?

• B65B 69/00 - Déballage des objets ou matériaux non prévu ailleurs

Abrégé

Provided are a pumping screen and a screening system having same. A pumping screen (200), comprising: a pump casing (210); a rotor impeller (220) accommodated in the pump casing; a drive shaft (230) passing through the pump casing and rotatably driving the rotor impeller; and a pulp screen (260) dividing the pump casing into an eccentric cavity (270) and a screening cavity (280), wherein the eccentric cavity accommodates the rotor impeller, and the screening cavity has a good pulp outlet (290). A pump inlet (240) of the pump casing is opposite to the front side of the rotor impeller, and a pump outlet (250) is located on the outer peripheral side of the pump casing. The pumping screen has the ability to pump, can increase the pressure, and also has a screening function.

Classes IPC  ?

• D21D 5/02 - Épuration de la pâte

Abrégé

A prefabricated Yankee cylinder section and a manufacturing method for a Yankee cylinder. The manufacturing method comprises: performing welding to internally connect first reinforcement flanges (101, 201) of two prefabricated Yankee cylinder sections (1, 2); performing preheating, and performing welding outside a housing to connect the two prefabricated Yankee cylinder sections (1, 2); performing machining to remove the first reinforcement flanges (101, 201) and second reinforcement flanges (102, 202) of the prefabricated Yankee cylinder sections and materials at and surrounding a radial inner end portion of a weld seam until regions at connections between the two prefabricated Yankee cylinder sections (1, 2) have been processed to meet the final size requirement of an internal cavity of a Yankee cylinder.

Classes IPC  ?

• B23K 33/00 - Extrémités de pièces spécialement profilées pour effectuer des assemblages brasés ou soudésRemplissage des joints continus ainsi formés
• B23P 15/00 - Fabrication d'objets déterminés par des opérations non couvertes par une seule autre sous-classe ou un groupe de la présente sous-classe
• D21F 5/02 - Séchage sur cylindres

Abrégé

A rotary drum pulper (100), comprising a rotary drum (110), a feed hopper (120) and a water addition tube (140), the feed hopper (120) being used for inputting material to a feed end (130) of the rotary drum (110), the water addition tube (140) being designed to be suitable for directly adding water from the feed end (130) of the rotary drum (110) to the inside of the rotary drum (110). Also disclosed is a water addition method for the rotary drum pulper (100), wherein water is directly added to the inside of the rotary drum pulper (100) via the water addition tube (140) without flowing through the feed hopper (120).

Classes IPC  ?

• D21B 1/34 - Pétrissage ou mélangePulpeurs

Abrégé

Disclosed in the present invention is a screen for treating a fiber suspension, especially a screen for treating a fiber suspension in the papermaking industry and the pulp industry. The screen has a large number of through openings for the fiber. The through openings have a hexagonal shape and are arranged in honeycomb type, so that the free passing area of the fiber suspension is increased, and the passing capacity of the fiber suspension is improved.

Classes IPC  ?

• D21D 5/16 - Cylindres et platines pour épurateurs

Abrégé

The present invention relates to a process for manufacturing
a Yankee cylinder. The process comprises welding the first
reinforcement flanges of two workpieces of Yankee cylinder section
from inside of the cylinder case, preheating and welding the two
workpieces of Yankee cylinder section from outside of the cylinder
case, and then removing the first, second reinforcement flanges,
radial inner end area of the weld and their surrounding material
in the workpieces of the Yankee cylinder section, so that the joint
of the two workpieces of Yankee cylinder section is machined to
meet the final dimension reciuirements for the Yankee cylinder inner
grooves. The present invention is also related to a workpiece of
Yankee cylinder section used in the said process.

Classes IPC  ?

• B23K 33/00 - Extrémités de pièces spécialement profilées pour effectuer des assemblages brasés ou soudésRemplissage des joints continus ainsi formés
• B23P 15/00 - Fabrication d'objets déterminés par des opérations non couvertes par une seule autre sous-classe ou un groupe de la présente sous-classe
• D21F 5/02 - Séchage sur cylindres