FI111446B - Arrangement in a pulp drying machine sheet cutter - Google Patents

Description

111446 Arrangement in the pulp dryer machine sheet feeder

The present invention relates to an arrangement in a pulp drying machine sheet cutter to enable the pulp dryer to increase its web speed, which includes a winder and a cross-section apparatus and a receiving conveyor for transporting and interleaving the cut sheets before dropping the sheets. The invention further relates to a method of stacking sheets into bales in a sheet cutter comprising a sheet cutter and a cross-sectional apparatus, a bale table and a receiving conveyor between the cross-cutting apparatus and the bale table for transporting and overlapping the cut sheets before dropping them.

15 The speed limiting device for pulp drying machines is mainly a sheet cutter. With current sheet cutters, speeds of almost 200 m / min are virtually non-existent. One limiting factor is essentially that the sheets cut at the end of the sheet cutter are thrown by the roller against the grille, after which they fall onto the bale table to form a bale, and preferably should not rise above about 80 m / min. If the sheet is thrown at a higher speed than this, there will be a burr mark on the edge as the sheets collide with the opposing Lei, thereby cumulatively advancing the bale shape, raising the bale edge higher. When such a bale is pressed with a bale press, a bale cap is formed, which in turn makes it more difficult to wrap and transport.

, Current machines, which typically run at speeds of 100-120 m / min, have a sheet overlap step after sheet cross-section, in which the successive sheets are slightly overlapped, allowing the sheets to roll over the bar into piles, while also passing the web. leads fall. This is sufficient when * ·: The machine's track speed is in the same range as the one currently used. However, when machine speed 2111446 is increased, overlapping as at present does not achieve the desired result, but causes runnability problems due to excessive sheet slowing / successive sheet speed difference.

Accordingly, it is an object of the present invention to provide an arrangement in a pulp drying machine sheet cutter that allows the machine web speed to be increased up to 200 m / min while maintaining the sheet rate at a desired level of less than about 100 m / min. . To accomplish this object, the arrangement 10 according to the invention is characterized by the features set forth in the characterizing part of claim 1. The method according to the invention, in turn, is characterized by the features set forth in the characterizing part of claim 6.

The invention will now be described in more detail with reference to the accompanying drawings, in which Figure 1 schematically shows a side view of a prior art sheet cutter and Figure 2 schematically shows an embodiment of the arrangement of the invention in a sheet cutter.

In Figures 1 and 2, like reference numerals are used for like parts.

In the prior art sheet cutter of FIG. 7 to over 30 for the receiving conveyor 8 and further through the press rollers, the roll arrangement and the discharge roll 9 to the bale table 14 between the distribution plates 10. In such a prior art *: sheet cutter, the interleaving device 6 normally performs about 20-30% 3111446 interleaving in one step (the rolls of the roller-pair pairs of conveyor 8 are shared in the prior art, e.g. by means of a chain through each roller). The bale table 14 may be implemented, for example, as a chain conveyor type. The equalizer 11 simultaneously presses the stack of sheets against the counter grille 12 for alignment purposes. The stack of sheets stacked on the bale table is then transported to the bale handling department via the bale table. If necessary, sheets removed through the wreck port 7 are transferred to the wreckage conveyor 15 and further to the pulper.

In the schematic embodiment shown in Fig. 2, the sheet speed 10 is preferably momentarily increased, after cross-section, by a pair of roller press rolls 6,6 ', which creates a distance D between the cut sheets substantially greater than the "cut line" resulting from the cut itself. The sheet speed is then reduced below the web speed by a pair of roller press rolls 21 ', 20', whereby the sheet coming from the previous step 15 at a higher speed than the web speed can be guided over the sheet passing below the web speed. A sheet assembly of roller 21 and overhead roller 20 is added to the sheet pickup conveyor 8 to further reduce sheet advance speed to overlap the sheets, for example about 30-40%, i.e. total overlap is then about 50-70%, preferably about 20-70% 60%. Figure 2 shows the direction of arrow A of the sheets reduced the running speed for the first interleaving response *. Correspondingly about 20-30% and the roll printing roll pair of the second Limi 21, 20 is obtained Setup Signaling arrow B, is the sheet running speed reduced correspondingly about 30-40% more, that is, the web speed is then about 30-50% of the original. Thus, for example, at a web speed of 25 for a sheet cutter having a web speed of about 200 m / min and a total overlap of about 60% (web speed of about 40% of the original), the web speed of cut sheets at roll roll 9 is about 80 m / min. By performing an overlap according to the invention, for example, as described above, the overlap can be increased in several steps by 20 ", 21"; 20, 21; 20 '' ', 21' '', whereby the throwing speed for the bale table counter grille can be maintained at about 100 m / min, preferably about 50-80 m / min. According to the invention, at least two

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By means of the interleaving performed on them, the sheet flow rate is preferably lowered to about 40-70 m / min per interleaving step.

In the arrangement according to the invention, a support device 22, e.g. a support plane, is arranged between successive pairs of press rollers 5 to support sheet flow in the sheet cutter.

In the embodiment of Figure 2, the transport and deceleration of the sheets is accomplished by lower rollers extending across the entire width of the sheet and by loaded rollers 10 having several rolls in the transverse direction of the sheet. The rolls 211 "; 1; 21 according to the invention may be either all independently adjustable! Or coupled to the drive motor by means of a suitable transmission providing multi-stage interleaving and deceleration according to the invention. The transmission may be either a predetermined standard transmission or e.g. or equivalent transmission, whereby the overlap and deceleration can be adjusted and controlled while the machine is running by means of suitable parameters.

Above, an additional interleaving device is shown as a pair of roller-press rolls 20, 21, but the additional interleaving can also be conceived by other means, such as a belt 20 conveyor, by adjusting the conveyor speed appropriately. In addition, the roller and roller overlapping roller roller pairs may have two or more sequentially on the conveyor part 8, for example, in the embodiment shown in Figure 2, the roller roller pairs 21 ", 20" and 21 "', 20' '' may also be used.

Claims (9)

111446 5 An arrangement in a sheet cutter for a pulp drying machine to enable the web speed to be increased, comprising a sheet cutter (2) and a cross-section apparatus (4, 5) and a receiving conveyor (8) for transporting and interleaving ), characterized in that the receiving conveyor (8) consists of a plurality of subassemblies (6, 6 '; 2021; 20 ", 21"; 20, 21; 20 "21"'), which sub-sheet extends substantially over the entire width of the sheet 10 one or more rolls (6 '; 21'; 21 "; 21; 2Γ") used, as well as at least two weight rolls (6; 20 ', 20 "; 20; 20'O) arranged successively to each roll above the sheet; a support device (22) arranged between the pairs of rollers and rollers, e.g., a support plane, whereby the transport speeds of the sheets in the various subassemblies can be varied to divide the subassemblies sheets of at least three different transport speeds to cause the sheets to overlap in at least two different steps. Arrangement according to Claim 1, characterized in that the roller-weight roller combinations (6 ', 6; 21', 20 '; 21 ", 20"; 21, 20) are connected to each other and to the drive apparatus by constant transmission, so that the speed decreases a predetermined amount in the various overlapping steps. * Arrangement according to Claim 1, characterized in that the roller-weight roller combinations (6 ', 6; 21', 20 '; 21 ", 20"; 21, 20) are connected to each other and to the drive by adjustable transmissions so that the reduction in the various overlapping stages is adjustable. »F Arrangement according to Claim 1, characterized in that the roll weight roller combinations (6 ', 6; 21', 20 '; 21 ", 20"; 21, 20; 21 "', 20" ') are different. used, which drives are individually adjustable for speed. «· 111446 6 Arrangement according to Claim 1, characterized in that said sub-assembly is formed by one or more lower support members (6 '; 2121 "; 21; 2Γ") underneath the sheets extending substantially over the entire width of the sheet and transverse to the sheet 5 at each lower support member. at least one upper support member (6; 20 '; 20 "; 20; 20"'). A method for stacking cellulite sheets into cellulose bales in a sheet cutter, comprising a sheet cutter (2) and a cross-section apparatus (4, 5), a bale table (14) and a receiving conveyor (8) between the cross section apparatus (4, 5) and the bale table (14). 16) for conveying and interleaving to reduce their speed before stacking the sheets on the bale table (14), characterized in that the sheets cut in the method (16) are interleaved in at least two steps by varying the transport speed of the sheets at different locations on the receiving conveyor (8). a group having different transport speeds and that the sheet flow rate is reduced by overlapping, in at least two different steps, about 40-70m / min per step. The method of claim 6, wherein the method comprises interleaving the sheets in said at least two different steps to achieve an overall overlap of about 50% or more. • · I A method according to claim 6, characterized in that in the first step about 20-30% of the sheet is interleaved and in the second step about 30-40% more. Method according to one of Claims 6 to 8, characterized in that the total overlap is about 50-70%, suitably about 60%, at a line speed of more than about 160 m / min, suitably above about 200 m / min. 7, 111446