摘要:
Methods for prepressing lignocellulose-containing fibrous material are disclosed including forming a lignocellulose-containing fibrous material into a web, initially compressing the web and permitting expansion of the web, recompressing the web in an entry section of a prepress to a density proximating that of the density of the initially pressed web, permitting the recompressed web to undergo controlled expansion in an expansion section of the prepress, injecting steam into the web within either the entry or expansion sections of the prepress, and transferring the expanded web into a finishing press.
摘要:
Pulp-dewatering apparatus is disclosed including a pair of press rolls and a rotatable pulp disintegrating screw above the nip region between the press rolls, and the apparatus includes a pair of doctor bars associated with the pair of press rolls, each doctor bar including a doctor blade for removing pulp from the surface of its associated press roll, and in which one of the doctor blades is disposed adjacent to the nip region below the pulp disintegrating screw such that the space between the pair of press rolls and the pulp disintegrating screw in which a pulp cake can form is substantially reduced.
摘要:
Methods for the continuous production of compressed board are disclosed including drying lignocellulosic fibrous material, gluing the lignocellulosic fibrous material, forming a mat, and pre-compressing the mat by controllably adding steam to the mat in an amount such that the temperature of the mat is increased to between about 60 and 90.degree. C.
摘要:
Methods for the continuous production of compressed board from lignocellulosic fibrous material are disclosed. The methods include providing the lignocellulosic fibrous material in the form of particles or fibers, drying, gluing and forming the lignocellulosic fibrous material into the form of a mat, and compressing the mat in the presence of steam in a single step which includes applying a compression roller to the mat and applying steam through the compression roller.
摘要:
Methods for sampling mixtures of flowable materials such as pulp streams are disclosed including tapping a minor portion of these mixtures and circulating the tapped portion continuously through a circuit, diluting the circulating tapped mixture to dilute the tapped mixture to a predetermined concentration, and recycling a portion of the diluted stream to the original mixture of materials. Apparatus for carrying out such a method is also disclosed.
摘要:
A pair of co-operating refining elements (10, 11) intended for a disc refiner with two opposed refining discs, one of which is stationary (stator) and the other one is rotary (rotor), for the working of lignocellulosic fiber material in a refining gap (12) between the co-operating refining elements (10, 11). The refining elements are provided with a pattern of bars (13-16) and intermediate grooves. Each bar is formed with a plurality of high bar portions (13, 15) and intermediate low bar portions (14, 16), counted in radial direction. High bar portions (13, 15) are located directly in front of low bar portions (14, 16) on opposed co-operating refining elements (10, 11). The length of the high bar portions (15) on refining elements (11) of the rotor exceeds the length of the high bar portions (13) on refining elements (10) of the stator.
摘要:
Apparatus for refining lignocellulose-containing material is disclosed including a pair of opposed refining disks defining a refining gap for the lignocellulose-containing material, at least one of the refining disks including an outer refining zone section which includes three refining zones including radially extending bars and corresponding radially extending grooves in which the first and third refining zones have a different bar density than the intermediate or second refining zone. Apparatus is also disclosed which includes a pair of opposed refining surfaces in which each disk refiner includes a pair of refining zones with one of each pair on each disk having a different bar density, and with the two zones being radially offset so that the like refining zones in each disk do not overlap with each other.
摘要:
Apparatus for dewatering material suspensions is disclosed including a pair of rotatable cylindrical liquid permeable press rolls at least partially immersed in a vat, inlet channels for supplying the material suspension to the bottom portion of the vat, transverse distribution pipes for distributing the material suspension to the inlet channels, and a central pipe for supplying the material suspension to the transverse distribution pipes, the central pipe including an adjustable outer sleeve axially adjustable therealong and connected to an openable portion at the bottom of the vat so that the adjustable outer sleeve and the openable portion of the vat can be adjusted between an upper closed position for normal operation of the apparatus and a lower open position in which access is provided to the space between the press rolls and the bottom of the vat, the central pipe including apertures so that when the adjustable outer sleeve and the openable portion of the vat are in the upper closed position, the apertures provide communication between the central pipe and the transverse distribution pipes.
摘要:
A process for the purification of a fiber suspension (deinking or white water) in which a mixture of fiber suspension and gas bubbles are jtted into a flotation tank in an upwardly directed manner toward the free surface of the pulp at a velocity of greater than Sm/s and the jet ends at or just below the free surface of the mixture.
摘要:
Apparatus for refining lignocellulose material is disclosed including two relatively rotatable refining disks separated by a refining gap which includes an inner radial portion and an outer angular portion, with the refiner elements mounted on the outer angular portions of the refiner disks including at least one wing projecting from the rotatable refining disk adjacent to the inner radial refining gap and with the stationary refining disk including a concave surface at the inlet portion so that the lignocellulose material being processed is thrown against the concave surface during its transition from the inner radial refining gap to the outer angular refining gap.