Sheet-material associating – Associating and folding – Zigzag package
Patent
1980-08-22
1983-05-24
Heinz, A. J.
Sheet-material associating
Associating and folding
Zigzag package
19 82, 19163, 156227, 493390, B41L 130
Patent
active
043847080
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention concerns a process for feeding defibrators with sheet pulp delivered in batches.
STATE OF THE PRIOR ART
In plants which are insufficiently integrated or not integrated at all and the so-called "fluff" absorbing cellulose based articles, the pulp as a rule is fed in the form of rolls because this allows a uniform and constant feed of the(se) machine(s).
The use of rolls suffers, however, from the drawback of being approximately 40% more costly than batch pulp. Batch pulp would be very economical. To that end, one may imagine sheets of pulp one behind the other, on the feed belt of a defibrator, or else meshing like roof-tiles.
Such arrangements suffer from the main drawback that they entail an uneven feed to the paper machine because the sheets' "tails," in full width, are instantly "swallowed" by the defibrator the moment they no longer are pinched by the drive rollers of this machine. This would result at the output end of these machines in a sudden product weight surplus followed by a weight shortage. This periodic variation might affect approximately 30% of the production.
On the other hand, the industrial formats of rectangular sheets as a rule are very large, considering the dimensions of the openings of the defibrators or grinders.
Other processes have been implemented (for instance the "MODO" system), which consist in achieving pre-chipping of the pulp which is temporarily stored in this form and subsequently treated again by beaters which generally are of the disk type. These plants again fail to provide a uniform flow of defibrated pulp, so that a high cost of production results, on one hand due to the power involved and on the other because it is necessary to run at a higher average weight in order not to fall below the minimum values which determine the quality and hence the value of the product.
DISCUSSION OF THE INVENTION
The object of the present invention is to conceive a novel feed process for a defibrator by sheet pulp delivered in batches. Uniform feed is achieved by relatively simple means.
To that end rectangular sheets are deposited one behind the other on a feed belt with their longitudinal axis shifted by 45% with respect to the direction of advance of the belt, then at least one lateral part of each sheet is folded back along a folding line parallel to the belt's direction of advance, the accurate superposition of the parts of single thickness with the folded sheets allowing the achievement of a constant cross-section.
The term "rectangular sheet" denotes also the square sheets to which the present invention remains applicable mutatis mutandis.
In a preferred mode of implementation of the invention, two lateral identical parts of each sheet are folded back along said folding lines which are parallel to the belt's direction of advance.
In this case the distance between said lines is equal to l/.sqroot.2 and two consecutive sheets are apart by x=L/.sqroot.2, where L and l, respectively, are the length and width of the pulp sheet.
In this case the sheets mesh on the feed belt, that is, two consecutive sheets partly straddle each other.
By adjusting in this manner the distance between two consecutively advancing sheets, a precise superposition of the single-thickness parts with the folded sheets is obtained. It is possible thereby to obtain a constant material thickness along the length of the tissue formed by the overlap corresponding to twice the thickness of the single sheet, and therefore a uniform feed.
In a variation of the implementing mode of the invention above, the lateral folded back parts may be other than identical. In this case the distance e between said folding lines always is equal to l/.sqroot.2, and in the same manner, two consecutive sheets are mutually apart by the same distance x=L/.sqroot.2, but, and this is very important, this variation implies an additional process stage consisting in making one rectangular sheet out of two pivot by 180.degree. in its plane.
In this case the sheets are overlapping only after the late
REFERENCES:
patent: 1767860 (1930-06-01), Shaffer
patent: 3382778 (1968-05-01), Berkowitz
patent: 3701522 (1972-10-01), Chi
patent: 4081305 (1978-03-01), Patin
Breiner A. W.
Heinz A. J.
S. A. Beghin-Say
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