SU965363A3 - Grinding set for pulp refiner - Google Patents

Abstract

Device for refining pulp for the production of high quality pulp at low specific energy consumption. The device comprises a number of channels (5) extending from the device's feed zone (2), into which is fed a fibrous material, to the device's outlet zone (3), from which a refined pulp is fed out. It also contains a number of flanges (6) that define the intermediate channels. The device is characterized by the fact that the bottom of at least the outlet portion of the channels is covered with a layer of synthetic, polymer resin in such a way that the distance from the outer surface of the resin layer to the level of the flange tops is between 0 and 3 mm.<IMAGE>

Description

 The invention relates to grinding: a headset for disc, conical, drum refiners, intended for enrichment of cellulosic fibrous materials and non-timber-based material materials, can be used in the pulp and paper industry.

The refining headset of a refiner for cellulose refining is known, including a surface for upgrading with a cellulose loading zone and an annular cellulose discharge zone, provided with edges with cutting edges forming between them grooves, the bottoms of which are covered with a layer of synthetic polymer resin, extending from the surface loading zone for Upgrading to the ends of the surface unloading area for upgrading 1.

A disadvantage of the known refiner headset is the relatively high consumption of energy needed for grinding the fibrous material.

The purpose of the invention is to increase the efficiency of using the grind of an advanced headset.

The goal is achieved by refining the refiner headset for cellulose enrichment, including a surface for upgrading with a cellulose loading zone and a ring cellulose discharge zone, provided with edges with cutting edges forming between the grooves, the bottoms of which are covered with a layer of synthetic polymer resin extending from the area surface loading for Upgrading to the end of the surface discharge area for upgrading; a layer of synthetic polymer resin is located at or 3 mm below ur ext cutting edges of the ribs, and the thickness of the synthetic resin layer is from 1.5 to 4 mm.

. In this case, a layer of synthetic polymer resin contains. abrasive particles dispersed therein, the latter being dispersed only in the outer part of the layer of synthetic polymer resin.

Abrasive particles are constituted. 30-90% of the weight of a layer of synthetic polymer resin and made of aluminum, silicon carbide, boron carbide staples, chromium oxide, iron oxide, emery, silicon sand, cement, glass and keralshticheskikh materials.

Fig. 1 shows a variant of the execution of the grinding headset of a disk refiner for refining cellulose;, part of the surface, top view; in fig. 2 shows an embodiment of a grinding headset of a disk refiner for enriching cellulose. FIG. 3 shows a grinding headset of a conical refiner for felting pulp, transverse

incision.

 The surface 1 for upgrading the grinding headset {FIG. 1) contains the cellulose loading zone 2, the annular discharge zone 3, the middle zone 4 through which the fibrous material passes from the load zone 2 to the discharge zone 3, the surface of the trimming 1 is grooved 5 formed by edges b with cutting edges. The bottoms of the grooves 5 are covered with a layer 7 of synthetic polymer resin (Fig. 2).

In the conical refiner (FIG. 3), the conical rotor 8 and the casing 9 have conical outer and inner surfaces respectively, Surfaces 8 and 9 are provided with grooves 5 and ribs 6, forming these grooves. The bottom of each groove is covered with a layer 7 of synthetic polymer resin Bottom The grooves 5 are covered with a layer of synthetic polymer resin in such a way that the layer is located at or 3 mm below the level of the cutting edges of the ribs 6, and the thickness of the layer of synthetic polymer resin is 1.5 4, О mm.

If the layer of synthetic polymer resin protrudes above the edges of the ribs, then this impairs the performance of the ribs in the refining. In addition, if the distance between the outer surface of the resin layer and the level of the edges of the ribs is more than 3 mm, then the reduction of the proper energy consumption of the refining process is insignificant.

The outer surface of the synthetic polymer resin layer is made smooth or slightly rough, flat or slightly convex or concave. In the case of roughness, concave or convex outer surface of the resin layer, the distance between the edge edges and the middle level of the outer surface of the layer should be 0-3 mm. If the outer surface is inclined in such a way that the closer the annular discharge zone is, the smaller the joint-seam distance between the outer surface of the resin layer and the level of the edges of the ribs, in this case the greatest distance between the outer surface of the resin layer and the level of the edges of the edges

should be in the range of 0-3 mm.

Synthetic polymer resin, used in this invention, is selected from the group,. consisting of synthetic thermoplastic resin and the last one from the group of -terpolymerB, polymers of acrylic ester, polymers of methacrylate ester, polymethylpentene, polysulfones, polyphenylene sulfide, terpolymer styrene maleic an Hydride and acrylic ester and polytetrafluoroethylene. It is more appropriate to use in the present isobreenia thermoplastic polymers polyamides, e.g. polyphenylene oxide with polystyrene. The thermosetting polymer is selected from the group consisting of phenolic, diallyl phthalate, unsaturated polyester, alkyd, epoxy, silicone, polyurethane, and melamine. urea resin. It is most expedient to use diallyl phthalate and epoxy resins as thermosetting polymers. The layer of synthetic polymer resin contains a large number of pores having a size of 200 microns or less. The pores are either interconnected or independent of one another. The synthetic polymer resin layer contains one or more additives, for example, pigments, antioxidants, fillers and stabilizers. It is advisable to choose a synthetic polymer resin from resins that are highly resistant to abrasive wear or degradation during refining, and that can be easily inserted and cured in the grooves, as well as allowed to dissolve during the manufacture of the resin layer.

The layer of synthetic polymer resin contains abrasive particles in the amount of 30-90% of the weight of the resin layer, the latter are evenly dispersed in the layer of synthetic polymer resin OR are located only in the outer part of the layer. A layer of resin, containing abrasive particles, is obtained by placing in a groove a weight of 7. including darbid silicon with a grain size of 60 μm and 3 wt. including poroic polycarbonate in the grooves of the pressing layer

mixtures so as to obtain a layer of the mixture and sintering it at 235 ° C.

The abrasive particles are selected from the group consisting of fine particles of aluminum, silicon carbide, boron carbide, steel, chromium oxide, iron oxide, emery silicon sand, cement, glass and ceramics, and have an average size of 50-600 microns ,

The layer of synthetic polymer resin can be formed by any known method. For example, a polymer thermoplastic resin in the form of powder or tablets is placed /. in the grooves, the molten polymer is melted at the melting point of the polymer resin, and then cooled to room temperature so that the polymer resin layer melted in the grooves is cured. In another embodiment, the melt of the thermoplastic polymer resin is leached into the grooves, then cured. thermosetting resins, liquid or powdered pre-hardener, the resin is placed in the grooves and heated to a high temperature to ensure the thermal hardening of the preliminary hardener of the resin in anavkah

The refiner grinding headset for pulp upgrading can be used in a single-disk, twin-disc, floating disc, conical, drum or cylindrical refiner. It is used to enrich the fibrous materials from wood chips, mechanically, thermally, chemically pretreated; mechanically treated pulp, for example pulverized wood pulp, pulverized pulp in mechanical pulp and thermomechanical pulp; high yield cellulose, such as chemically crushed and semi-chemical cellulose; - clarified and unclarified chemical cellulose, such as kraftz cellulose, sulphite and soda cellulose, - boiled in an atmosphere of oxygen and clarified cellulose, secondary fibrous cellulose.

The milling set is also used to enrich non-wood cellulosic fibrous material, for example, inorganic fibrous, synthetic fibrous materials and synthetic cellulose. Usually fibrous, the material is poured into the refiner in the form of an aqueous suspension. We offer grinding

headset-for cellulose refining is effective for refining fibrous material at any: its content in the aqueous suspension, i.e. content of fibrous material in

the aqueous suspension may be less than -6 wt.%, &amp; -15 wt.%, or more than 15 wt.%.

The use of this invention allows to reduce the consumption of energy spent on upgrading water.

loknistogo material, and therefore / to increase the efficiency of use of the grinding headset.

Claims (1)

Invention Formula 15 1, Grinding headset refiner for pulp upgrading, including a surface finisher: living with a cellulose loading area, and The Q annular cellulosis discharge zone, provided with ribs with cutting edges, forming between themselves grooves, the bottom of which is covered with a layer of synthetic polymer resin, extending from the surface loading zone for refining to the end of the surface extraction zone for improving increase the efficiency of its use, a layer of synthetic poly30 the measuring resin is at or about 3 mm below the level of the cutting edges of the ribs, and the thickness of the synthetic resin layer is from 1.5 to 4.0 mm,  2, The milling headset according to claim 1, indicative of the fact that the synthetic polymer resin layer contains abrasive particles dispersed therein, 40 3 The grinding headset according to claim 2, characterized in that the abrasive particles are dispersed in the outer part of the synthetic resin layer, .45 4, Grinding headset according to para, 2, about tl and h ay, so that the abrasive particles comprise from 30 to 90% of the weight of the layer of synthetic polymer resin, 50 5 Grinding headset according to claim 2, characterized in that the abrasive particles are made of aluminum silicon carbide, boron carbide, steel, chromium oxide, iron oxide, emery, cree (sand, cement, glass and ceramic materials. Sources of information taken into account in the examination 1, U.S. Patent 3,745,645, 60 cl, B 23 C 19/00, 1973, plft. f S 6 (/ y.