EP0020600B1 - Process for feeding a shredder with pulp supplied in bales - Google Patents

Process for feeding a shredder with pulp supplied in bales Download PDF

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Publication number
EP0020600B1
EP0020600B1 EP79901573A EP79901573A EP0020600B1 EP 0020600 B1 EP0020600 B1 EP 0020600B1 EP 79901573 A EP79901573 A EP 79901573A EP 79901573 A EP79901573 A EP 79901573A EP 0020600 B1 EP0020600 B1 EP 0020600B1
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Prior art keywords
sheet
sheets
belt
feeding process
angle
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German (de)
French (fr)
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EP0020600A1 (en
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Pierre Laplanche
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Kaysersberg SA
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Beghin Say SA
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
    • D21B1/00—Fibrous raw materials or their mechanical treatment
    • D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
    • D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
    • D21B1/14—Disintegrating in mills
    • D21B1/26—Driving or feeding arrangements
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
    • D21B1/00—Fibrous raw materials or their mechanical treatment
    • D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
    • D21B1/06—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by dry methods
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
    • Y10T156/10—Methods of surface bonding and/or assembly therefor
    • Y10T156/1002—Methods of surface bonding and/or assembly therefor with permanent bending or reshaping or surface deformation of self sustaining lamina
    • Y10T156/1051—Methods of surface bonding and/or assembly therefor with permanent bending or reshaping or surface deformation of self sustaining lamina by folding

Definitions

  • the present invention relates to a process for feeding shredders with sheet pulp delivered in bales.
  • the object of the present invention is to design a new method of feeding a shredder with pulp in sheets delivered in bales, which ensures regular feeding with relatively simple means.
  • the rectangular sheets are placed one behind the other on a feed belt with their longitudinal axis offset by an angle ⁇ relative to the direction of advancement of the belt, each sheet partially covering its neighbor, then at least a lateral part of each sheet is folded down by folding along a fold line parallel to the direction of advancement of the carpet, the exact superimposition of the simple thickness parts of the neighboring sheets with the parts doubled by folding making it possible to obtain a cross-section ply constant.
  • rectangular sheet is meant both square sheets for which the present invention remains applicable.
  • the angle a is 45 ° and two identical lateral parts of each sheet are folded down by folding along said fold lines parallel to the direction of advance of the belt.
  • the sheets are buried on the feed belt, that is to say that two successive sheets partially overlap.
  • the angle ⁇ is 45 ° and the folded side parts may not be identical.
  • the sheets are not buried until after the lateral parts of the sheets have been folded and every other sheet has been rotated. It has been found that the sudden entrainment of the width tail occurs when it is in the "downstream" position of the other sheets as a function of the working direction of the defibration tool (bottom sheet for a defibration tool working by moving down).
  • the sheets will preferably be buried one under the other successively on the feeding belt, and the side parts will be folded down by pivot lie up. In this way, the "tails" are found in the upper part.
  • the fold line is the bisector of the foremost angle of the rectangular sheet, and it is also necessary to rotate one sheet of two by 180 ° C before forming the sheet of constant section.
  • the method comprises, in addition to the deposition of the sheets on a carpet, the formation of the folds and the actual folding, an inversion of one sheet of two to superimpose the parts of simple thickness. According to the present variant, it is a real reversal and not a simple 180 ° rotation of the sheet in its plane.
  • the distance x defined above will separate the sheets of successive "even rank” and will be equal to the distance between the sheets of successive "odd rank".
  • an offset equal to x / 2 will be chosen between the two sets of sheets, which will make it possible to deposit the sheets on the feed belt with a constant offset.
  • the process is mainly illustrated in the diagrammatic drawing of FIG. 3.
  • the reference 1 is a feeding belt for a shredder 2.
  • a bale 3 of paper pulp in rectangular sheets is arranged with its longitudinal axis corresponding to the length of the sheets , directed towards the feeding belt and making an angle of 45 ° with the advancement direction of the latter.
  • a second dough ball 4 has been represented with its transverse axis, corresponding to the width of the sheets, directed towards the feed belt and offset by 45 ° with respect to the direction of advance of this last.
  • the arrangement of the second dough ball makes it possible to carry out the operation of feeding the shredder without any interruption, the gripping of the sheets on the ball 4 being done automatically after exhaustion of the ball 3 and vice versa.
  • the sheets are distributed individually by a vacuum gripping system.
  • two suction cups 3a, respectively 4a grip the upper sheet of the bale towards its "front” angles in the direction of the dispensing movement according to the arrow f3, respectively f4, to place them in the "enthilées" position on the carpet d 'food.
  • Interfacing can be done in two ways, either one after the other, or one after the other.
  • the interlining is preferably done in the second way.
  • the sheet is taken up into abutment by centering and pushing tabs referenced 7.
  • FIG. 1 represents a rectangular sheet folded according to the method of the invention.
  • the reference 8 in FIG. 3 schematically represents the packing station where the folds are carried out.
  • the accuracy of the distribution rate can be obtained by any suitable means of known type, such as photoelectric detection for example.
  • x L / ⁇ 2 where L is the length of the rectangular sheet.
  • the quantity of pulp treated is very regular and equal to the consistency of the weight of the sheets, at the entrance, in and at the exit of the defibrator, which simplifies the regular formation of the mattresses. fiber.
  • the reference 9 ( Figure 3) schematically represents a presser roller path.
  • the sheets are separated from each other by a distance equal to x / 2.
  • the successive "even rank” sheets 10a, 10c form a two-ply sheet, similar to that shown in the drawing in FIG. 2.
  • the successive "odd rank” sheets 10b, 10d form a second sheet identical to the first.
  • the whole constitutes a tablecloth with four thicknesses.
  • the two plies are advantageously formed in the drawing of FIG. 4 using a regular offset equal to half the distance x.
  • the direction of the fold lines does not extend by 45 ° relative to the longitudinal direction of the sheet.
  • the angle a which allows a folding corresponding to the definition of the invention.
  • a is the ratio dimensions of the rectangle.
  • the ratio is, by definition, greater than 1.
  • the width P of the folded rectangular sheet is equal, under these conditions, to:

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  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Folding Of Thin Sheet-Like Materials, Special Discharging Devices, And Others (AREA)
  • Absorbent Articles And Supports Therefor (AREA)
  • Paper (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)
  • Pens And Brushes (AREA)
  • Orthopedics, Nursing, And Contraception (AREA)
  • Crushing And Grinding (AREA)
  • Dowels (AREA)
  • Degasification And Air Bubble Elimination (AREA)
  • Separation By Low-Temperature Treatments (AREA)
  • Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
  • Electrotherapy Devices (AREA)
  • Preliminary Treatment Of Fibers (AREA)
  • Stereophonic System (AREA)
  • Percussion Or Vibration Massage (AREA)
  • Glass Compositions (AREA)
  • Auxiliary Devices For And Details Of Packaging Control (AREA)

Abstract

PCT No. PCT/FR79/00116 Sec. 371 Date Aug. 22, 1980 Sec. 102(e) Date Aug. 21, 1980 PCT Filed Nov. 30, 1979 PCT Pub. No. WO80/01290 PCT Pub. Date Jun. 26, 1980.A process for feeding defibrators with sheet pulp delivered in batches. Rectangular sheets are deposited one behind another on a feed belt with their longitudinal axis offset by 45 DEG with respect to the direction of advance of the belt, whereupon two equal lateral parts from each sheet are folded back along two folding lines parallel to the direction of advance of the belt, the distance e between said lines being equal to l/ 2ROOT 2 and two consecutive sheets being mutually apart by x=L/ 2ROOT 2, L and l, respectively, being the length and the width of the pulp sheet. Feeding a machine for diapers.

Description

DOMAINE TECHNIQUETECHNICAL AREA

La présente invention concerne un procédé d'alimentation de défibreurs avec de la pâte en feuilles livrée en balles.The present invention relates to a process for feeding shredders with sheet pulp delivered in bales.

TECHNIQUE ANTERIEUREPRIOR ART

Dans les usines non intégrées ou insuffisamment intégrées, fabriquant des articles à base de cellulose absorbante dite "fluff", la pâte parvient généralement sous forme de rouleaux, parce qu'elle permet une alimentation uniforme et constante de la ou des machines.In factories which are not integrated or insufficiently integrated, manufacturing articles based on absorbent cellulose known as "fluff", the pulp generally arrives in the form of rolls, because it allows a uniform and constant supply of the machine or machines.

Elle présente toutefois l'inconvénient de coûter environ 40% plus cher que la pâte en balles.However, it has the disadvantage of being about 40% more expensive than dough in bales.

L'utilisation de la pâte en balles s'avèrerait donc très économique. Pour cela, on peut imaginer de déposer les feuilles les unes derrière les autres, sur un tapis d'alimentation d'un défibreur, ou bien "entuilées" les unes sur les autres, comme des tuiles qui chevauchent.The use of dough in balls would therefore prove to be very economical. For that, one can imagine depositing the sheets one behind the other, on a feeding belt of a shredder, or else "entuilées" one on the other, like overlapping tiles.

De telles dispositions présentent l'inconvénient principal d'entraîner une alimentation irrégulière de la machine à papier, parce que les "queues" de feuilles, en pleine laize, sont instantanément "avalées" par le défibreur dès qu'elles ne sont plus pincées par les rouleaux d'entraînement de celui-ci. Cela se traduirait, à la sortie des machines, par un surcroît soudain de grammage des produits, immédiatement suivi d'un manque de grammage. Cette variation périodique pourrait concerner jusqu'à 30% de la production environ.Such arrangements have the main disadvantage of causing an irregular feeding of the paper machine, because the "tails" of sheets, in full width, are instantly "swallowed" by the shredder as soon as they are no longer pinched by the drive rollers thereof. This would result, on leaving the machines, by a sudden increase in the grammage of the products, immediately followed by a lack of grammage. This periodic variation could concern up to around 30% of production.

D'autre part, les formats du commerce des feuilles rectangulaires sont en général très importants, eu égard aux dimensions des ouvertures des défibreurs ou broyeurs.On the other hand, the commercial formats of rectangular sheets are generally very important, having regard to the dimensions of the openings of the shredders or shredders.

D'autres procédés ont été mis en oeuvre (comme le système "MODO" par exemple), qui consistent à réaliser un pré-déchiquetage de la pâte qui est stockée temporairement sous cette forme pour être reprise ensuite par des raffineurs généralement à disques. Ces installations ne donnent pas non plus un débit régulier de pâte défibrée, d'où résulte un coût de production plus élevé, d'une part en raison des puissances mises en jeu, et d'autre part du fait qu'il est nécessaire de régler sur un poids moyen plus élevé pour ne pas descendre au-dessous des valeurs minima qui conditionnent la qualité, donc la valeur du produit.Other processes have been implemented (such as the "MODO" system for example), which consist in carrying out a pre-shredding of the dough which is temporarily stored in this form to then be taken up by refiners generally with discs. These installations also do not give a regular flow of defibrated pulp, which results in a higher production cost, on the one hand because of the powers involved, and on the other hand because it is necessary to adjust to a higher average weight so as not to fall below the minimum values which condition the quality, therefore the value of the product.

EXPOSE DE L'INVENTIONSTATEMENT OF THE INVENTION

Le but de la présente invention est de concevoir un procédé nouveau d'alimentation d'un défibreur avec de la pâte en feuilles livrée balles, qui assure une alimentation régulière avec des moyens relativement simples.The object of the present invention is to design a new method of feeding a shredder with pulp in sheets delivered in bales, which ensures regular feeding with relatively simple means.

Pour cela, les feuilles rectangulaires sont déposées les unes derrière les autres sur un tapis d'alimentation avec leur axe longitudinal décalé d'un angle α par rapport à la direction d'avancement du tapis, chaque feuille recouvrant partiellement sa voisine, puis au moins une partie latérale de chaque feuille est rabattue par pliage selon une ligne de pliage parallèle à la direction d'avancement du tapis, la superposition exacte des parties de simple épaisseur des feuilles voisines avec les parties doublées par pliage permettant d'obtenir une nappe de section constante.For this, the rectangular sheets are placed one behind the other on a feed belt with their longitudinal axis offset by an angle α relative to the direction of advancement of the belt, each sheet partially covering its neighbor, then at least a lateral part of each sheet is folded down by folding along a fold line parallel to the direction of advancement of the carpet, the exact superimposition of the simple thickness parts of the neighboring sheets with the parts doubled by folding making it possible to obtain a cross-section ply constant.

Par feuille rectangulaire, il faut entendre aussi bien les feuilles carrées pour lesquelles la présente invention reste mutandis applicable.By rectangular sheet is meant both square sheets for which the present invention remains applicable.

Selon un mode préféré d'exécution de l'invention, l'angle a est de 45° et deux parties latérales identiques de chaque feuille sont rabuttues par pliage selon lesdites lignes de pliage parallèles à la direction d'avancement du tapis.According to a preferred embodiment of the invention, the angle a is 45 ° and two identical lateral parts of each sheet are folded down by folding along said fold lines parallel to the direction of advance of the belt.

Dans ce cas, la distance e entre lesdites lignes est égale à I/√2 et deux feuilles successives sont distantes l'une de l'autre de x = L/yZ: L et étant respectivement la longueur et la largeur de la feuille de pâte.In this case, the distance e between said lines is equal to I / √2 and two successive sheets are distant from each other by x = L / yZ: L and being respectively the length and the width of the sheet of dough.

Dan ce cas, les feuilles sont entuilées sur le tapis d'alimentation, c'est-à-dire que deux feuilles successives se chevauchent partiellement.In this case, the sheets are buried on the feed belt, that is to say that two successive sheets partially overlap.

En réglant de cette manière la distance entre deux feuilles entuilées voisines, on obtient une superposition exacte des parties de simple épaisseur des feuilles voisines avec les parties doublées par pliage. Ce qui permet d'avoir sur toute la longueur de la nappe constituée par l'entuilage une épaisseur de matière constante correspondant à deux fois l'épaisseur de la feuille unitaire, donc une alimentation régulière.By adjusting in this way the distance between two neighboring tiled sheets, one obtains an exact superposition of the parts of simple thickness of the neighboring sheets with the parts doubled by folding. This makes it possible to have, over the entire length of the sheet formed by the interlining, a constant thickness of material corresponding to twice the thickness of the unitary sheet, therefore regular feeding.

Selon une variante du mode d'exécution de l'invention indiqué ci-dessus, I'angIe α est de 45° et les parties latérales rabattues peuvent ne pas être identiques. Dans ce cas, la distance e entre lesdites lignes de pliage est toujours égale à I/√2 et de la même manière deux feuilles successives sont distantes l'une de l'autre de la même distance x = L/√2 mais, et cela est très important, cette variante implique une étape supplémentaire du procédé qui consiste à faire pivoter de 180° dans on plan une feuille rectangulaire sur deux.According to a variant of the embodiment of the invention indicated above, the angle α is 45 ° and the folded side parts may not be identical. In this case, the distance e between said fold lines is always equal to I / √2 and in the same way two successive sheets are distant from each other by the same distance x = L / √2 but, and this is very important, this variant involves an additional step in the process which consists in rotating one rectangular sheet out of two in the plane.

Dans ce cas, les feuilles ne sont entuilées qu'après le pliage des parties latérales des feuilles et la rotation d'une feuille sur deux. On a constaté que l'entraînement soudain de la queue de laize se produit quand elle se trouve en position "aval" des autres feuilles en fonction du sens de travail de l'outil de défibrage (feuille du dessous pour un outil de défibrage travaillant par déplacement vers le bas).In this case, the sheets are not buried until after the lateral parts of the sheets have been folded and every other sheet has been rotated. It has been found that the sudden entrainment of the width tail occurs when it is in the "downstream" position of the other sheets as a function of the working direction of the defibration tool (bottom sheet for a defibration tool working by moving down).

Pour cette raison, les feuilles seront de préférence entuilées les unes sous les autres successivement sur le tapis d'alimentation, et les parties latérales seront rabattues par pivotement vers le haut. De cette façon, les "queues" se retrouvent en partie supérieure.For this reason, the sheets will preferably be buried one under the other successively on the feeding belt, and the side parts will be folded down by pivot lie up. In this way, the "tails" are found in the upper part.

Il est évident qu'on peut également procéder à l'entuilage en plaçant les feuilles successivement les unes sur les autres, ce qui simplifierait légèrement l'entuilage proprement dit, mais obligerait à rabattre les parties latérales vers le bas, ce qui serait industriellement plus compliqué, tant sur le plan des équipements que du contrôle par l'opérateur.It is obvious that we can also proceed with the interlining by placing the sheets successively one on the other, which would slightly simplify the interlining itself, but would require folding the side parts down, which would be industrially more complicated, both in terms of equipment and operator control.

On peut également ne rabattre qu'une partie latérale. Dans ce cas, la ligne de pliage est la bissectrice de l'angle le plus avant de la feuille rectangulaire, et il est nécessaire également de faire pivoter une feuille sur deux de 180°C avant de former la nappe de section constante.You can also fold down only one side part. In this case, the fold line is the bisector of the foremost angle of the rectangular sheet, and it is also necessary to rotate one sheet of two by 180 ° C before forming the sheet of constant section.

Selon une autre variante du procédé de l'invention, on peut, sous certaines conditions géométriques, parvenir à superposer les surfaces de simple épaisseur de feuilles pliées selon une direction autre que celle qui fait un angle de 45°C avec la direction longitudinale de la feuille.According to another variant of the process of the invention, it is possible, under certain geometrical conditions, to succeed in superimposing the simple thickness surfaces of sheets folded in a direction other than that which makes an angle of 45 ° C with the longitudinal direction of the leaf.

On a montré que pour chaque type de rectangle, défini par le rapport de ses dimensions, il n'existe qu'une seule possibilité pour l'angle a d'inclinaison des lignes de pliage par rapport à la dimension longitudinale du rectangle.It has been shown that for each type of rectangle, defined by the ratio of its dimensions, there is only one possibility for the angle a of inclination of the fold lines with respect to the longitudinal dimension of the rectangle.

Selon cette variante, le procédé comprend, outre le dépôt des feuilles sur un tapis, la formation des plis et le pliage proprement dit, un retournement d'une feuille sur deux pour superposer les parties de simple épaisseur. Il s'agit, selon la présente variante, d'un véritable retournement et non d'une simple rotation de 180° de la feuille dans son plan.According to this variant, the method comprises, in addition to the deposition of the sheets on a carpet, the formation of the folds and the actual folding, an inversion of one sheet of two to superimpose the parts of simple thickness. According to the present variant, it is a real reversal and not a simple 180 ° rotation of the sheet in its plane.

On pourra également obtenir une nappe d'une épaisseur constante et égale à quatre fois l'épaisseur de la feuille unitaire en superposant deux nappes de deux épaisseurs obtenues selon l'un quelconque des modes de réalisation de l'invention précités.It is also possible to obtain a sheet of constant thickness equal to four times the thickness of the unitary sheet by superimposing two sheets of two thicknesses obtained according to any one of the abovementioned embodiments of the invention.

De façon préférentielle, cependant, on ne superposera pas les deux nappes, mais on ne constituera qu'une seule nappe de quatre feuilles, la distance x définie précédemment séparera les feuilles de "rang pair" successives et sera égale à la distance entre les feuilles de "rang impair" successives.Preferably, however, we will not superimpose the two layers, but we will only constitute a single layer of four sheets, the distance x defined above will separate the sheets of successive "even rank" and will be equal to the distance between the sheets of successive "odd rank".

De façon particulière et pour des raisons pratiques, on choisira un décalage égal à x/2 entre les deux séries de feuilles, ce qui permettra de déposer les feuilles sur le tapis d'alimentation avec un décalage constant.In particular and for practical reasons, an offset equal to x / 2 will be chosen between the two sets of sheets, which will make it possible to deposit the sheets on the feed belt with a constant offset.

BREVE DESCRIPTION DES DESSINSBRIEF DESCRIPTION OF THE DRAWINGS

  • La figure 1 est un croquis représentant une feuille pliée selon l'invention.Figure 1 is a sketch showing a folded sheet according to the invention.
  • La figure 2 est un croquis représentant deux feuilles successives pliées selon l'invention et entuilées avec un décalage "x".Figure 2 is a sketch showing two successive sheets folded according to the invention and draped with an offset "x".
  • La figure 3 est un croquis représentant les différentes étapes du procédé d'alimentation selon l'invention.Figure 3 is a sketch showing the different stages of the feeding process according to the invention.
  • La figure 4 est un croquis représentant une nappe de pâte à quatre épaisseurs, constituée selon le procédé de l'invention.Figure 4 is a sketch showing a sheet of dough with four thicknesses, formed according to the method of the invention.
  • La figure 5 est un croquis illustrant un autre mode de réalisation de l'invention (rabat de deux parties latérales non identiques).Figure 5 is a sketch illustrating another embodiment of the invention (flap of two non-identical side parts).
  • La figure 6 est un croquis illustrant également un autre mode de réalisation de l'invention (rabat d'une seule partie latérale).Figure 6 is a sketch also illustrating another embodiment of the invention (flap of a single side part).
  • La figure 7 est un croquis illustrant un autre mode de réalisation de l'invention (rabat de deux parties selon une direction inférieure à 45°).Figure 7 is a sketch illustrating another embodiment of the invention (flap of two parts in a direction less than 45 °).
MEILLEURE MANIERE DE REALISER L'INVENTIONBEST WAY TO IMPLEMENT THE INVENTION

Le procédé est illustré principalement sur le dessin schématique de la figure 3. Le repère 1 est un tapis d'alimentation pour un défibreur 2. Une balle 3 de pâte à papier en feuilles rectangulaires est disposée avec son axe longitudinal correspondant à la longueur des feuilles, dirigé vers le tapis d'alimentation et faisant un angle de 45° avec la direction d'avancement de ce dernier.The process is mainly illustrated in the diagrammatic drawing of FIG. 3. The reference 1 is a feeding belt for a shredder 2. A bale 3 of paper pulp in rectangular sheets is arranged with its longitudinal axis corresponding to the length of the sheets , directed towards the feeding belt and making an angle of 45 ° with the advancement direction of the latter.

Dans le croquis de la figure 3, on a représenté une seconde balle de pâte 4 avec son axe transversal, correspondant à la largeur des feuilles, dirigé vers le tapis d'alimentation et décalé de 45° par rapport à la direction d'avancement de ce dernier. La disposition de la seconde balle de pâte permet de réaliser l'opération d'alimentation du défibreur sans aucune interruption, la préhension des feuilles sur la balle 4 se faisant automatiquement après épuisement de la balle 3 et vice versa.In the sketch of FIG. 3, a second dough ball 4 has been represented with its transverse axis, corresponding to the width of the sheets, directed towards the feed belt and offset by 45 ° with respect to the direction of advance of this last. The arrangement of the second dough ball makes it possible to carry out the operation of feeding the shredder without any interruption, the gripping of the sheets on the ball 4 being done automatically after exhaustion of the ball 3 and vice versa.

La distribution des feuilles à l'unité se fait par un système de préhension à ventouses sous dépression. De préférence, deux ventouses 3a, respectivement 4a, saisissent la feuille supérieure de la balle vers ses angles "avant" dans le sens du mouvement de distribution selon la flèche f3, respectivement f4, pour les déposer en position "entuilées" sur le tapis d'alimentation.The sheets are distributed individually by a vacuum gripping system. Preferably, two suction cups 3a, respectively 4a, grip the upper sheet of the bale towards its "front" angles in the direction of the dispensing movement according to the arrow f3, respectively f4, to place them in the "enthilées" position on the carpet d 'food.

L'entuilage peut se faire de deux façons, soit successivement les unes sur les autres, soit successivement les unes sous les autres. Pour les raisons déjà indiquées ci-dessus, l'entuilage est, de préférence, fait selon la deuxième façon.Interfacing can be done in two ways, either one after the other, or one after the other. For the reasons already indicated above, the interlining is preferably done in the second way.

Les feuilles de pâte, entuilées en position diagonale avec un décalage réglé par la cadence de distribution dont le contrôle peut être effectué par exemple par une détection photo-électrique, passent ensuite dans une station de marquage équipée de deux jeux d'outils rotatifs 5, 6 pour le marquage des plis qui permettront de rabbattre plus facilement et avec plus de précision géométrique les parties latérales de la bande continue ainsi constituée.The dough sheets, entiled in a diagonal position with an offset adjusted by the distribution rate, the control of which can be carried out, for example by photoelectric detection, then pass through a marking station equipped with two sets of rotary tools 5, 6 for marking the folds which will allow the lateral parts of the continuous strip thus formed to be folded down more easily and with more geometric precision.

L'écartement des outils de marquage est égal à e = l/yl2 dans lequel est la largeur de la feuille rectangulaire.The spacing of the marking tools is equal to e = l / yl2 in which is the width of the rectangular sheet.

Pour réaliser avec précision la mise en position de la feuille rectangulaire sur le tapis d'alimentation, notamment en position transversale sur le tapis, et ajuster la valeur du décalage, la feuille est prise en butée par des taquets de centrage et de poussée référencés 7.To precisely position the rectangular sheet on the carpet feed, in particular in a transverse position on the belt, and adjust the value of the offset, the sheet is taken up into abutment by centering and pushing tabs referenced 7.

La position des taquets de centrage est telle que les deux parties latérales rabattues de la feuille ont des dimentions égales, comme on peut le voir sur le croquis de la figure 1 qui représente une feuille rectangulaire repliée selon le procédé de l'invention.The position of the centering tabs is such that the two lateral folded back parts of the sheet have equal dimensions, as can be seen in the sketch in FIG. 1 which represents a rectangular sheet folded according to the method of the invention.

Le repère 8 de la figure 3 représente schématiquement le poste de dossage où sont effectués les pliages. En réglant la distribution d'entuilage avec un décalage d'une valeur égale à "x" (voir figure 1), on obtient une superposition exacte des parties de simple épaisseur avec les feuilles pliées, ce qui permet d'avoir sur toute la longueur de la nappe constituée par l'entuilage une épaisseur de matière constante correspondant à deux fois l'épaisseur de la feuille unitaire, comme représenté sur le dessin de la figure 2.The reference 8 in FIG. 3 schematically represents the packing station where the folds are carried out. By adjusting the distribution of interlining with an offset of a value equal to "x" (see Figure 1), we obtain an exact superposition of the parts of simple thickness with the folded sheets, which allows to have over the entire length of the sheet formed by the interlining, a constant thickness of material corresponding to twice the thickness of the unitary sheet, as shown in the drawing in FIG. 2.

Comme indiqué précédemment, la précision de la cadence de distribution peut être obtenue par tout moyen adéquat de type connu, tel qu'une détection photo-électrique par exemple.As indicated previously, the accuracy of the distribution rate can be obtained by any suitable means of known type, such as photoelectric detection for example.

La valeur x du décalage répond à la définition suivant : x =L/√2 dans laquelle L est la longueur de la feuille rectangulaire.The x value of the offset meets the following definition: x = L / √2 where L is the length of the rectangular sheet.

En alimentant de cette façon l'appareil de défibrage, la quantité de pâte traitée est très régulière et égale à la constance de poids des feuilles, à l'entrée, dans et à la sortie du défibreur, de qui simplifie la formation régulière des matelas de fibres.By feeding the defibration apparatus in this way, the quantity of pulp treated is very regular and equal to the consistency of the weight of the sheets, at the entrance, in and at the exit of the defibrator, which simplifies the regular formation of the mattresses. fiber.

Le repère 9 (figure 3) représente schématiquement un chemin presseur à rouleaux.The reference 9 (Figure 3) schematically represents a presser roller path.

Dans le mode de réalisation représenté sur la figure 4 les feuilles sont séparées entre elles d'une distance égale à x/2. Les feuilles de "rang pair" 10a, 10c, successives forment une nappe à deux épaisseurs, semblable à celle représentée sur le dessin de la figure 2. Les feuilles de "rang impair" successives 10b, 10d, forment une seconde nappe identique à la première.In the embodiment shown in FIG. 4, the sheets are separated from each other by a distance equal to x / 2. The successive "even rank" sheets 10a, 10c form a two-ply sheet, similar to that shown in the drawing in FIG. 2. The successive "odd rank" sheets 10b, 10d, form a second sheet identical to the first.

L'ensemble constitue une nappe à quatre épaisseurs. Les deux nappes sont avantageusement formées sur le dessin de la figure 4 à l'aide d'un décalage régulier égal à la moitié de la distance x.The whole constitutes a tablecloth with four thicknesses. The two plies are advantageously formed in the drawing of FIG. 4 using a regular offset equal to half the distance x.

Dans un second exemple illustré par le croquis de la figure 5, les parties latérales rabattues (11,12) de chaque feuille ne sont plus identiques. Il suffit alors pour réaliser une nappe de section constante de faire pivoter de 1800 dans son plan une feuille sur deux, (la feuille B dans le croquis de la figure 5). Dès lors, les parties de simple épaisseur deviennent complémentaires.In a second example illustrated by the sketch in Figure 5, the folded side parts (11,12) of each sheet are no longer identical. It then suffices to make a sheet of constant section to rotate 180 0 in its plane every other sheet (sheet B in the sketch of FIG. 5). Consequently, the parts of simple thickness become complementary.

Dans un troisième exemple illustrè par le croquis de la figure 6, une seule partie latérale est rabattue selon la bissectrice de l'angle le plus en avant. Comme dans l'exemple précédent, il est nécessaire de faire pivoter de 180° une feuille sur deux dans son plan. Dès lors, l'entuilage n'a lieu qu'après l'opération de pliage.In a third example illustrated by the sketch in Figure 6, a single side part is folded along the bisector of the most forward angle. As in the previous example, it is necessary to rotate 180 ° every other sheet in its plane. Therefore, the covering only takes place after the folding operation.

Dans un quatrième exemple illustré par le croquis de la figure 7, la direction des lignes de pliage n'ext pas de 45° par rapport à la direction longitudinale de la feuille. Dans ce cas, il n'existe pour un rectangle donné, qu'une seule valeur de l'angle a qui permettre un pliage répondant à la définition de l'invention.In a fourth example illustrated by the sketch in FIG. 7, the direction of the fold lines does not extend by 45 ° relative to the longitudinal direction of the sheet. In this case, there exists for a given rectangle, only one value of the angle a which allows a folding corresponding to the definition of the invention.

Par calcul, on a montrée que l'angle a était déterminé par la formule suivante:

Figure imgb0001
dans laquelle a est le rapport
Figure imgb0002
des dimensions du rectangle. Le rapport est, par définition, supérieur à 1. Dans un tel cas, comme on le montre sur la figure 7, si l'on appelle x' et y' les distances respectives du bord d'attaque de la feuille rectangulaire à l'amorce des lignes de pliage, on a:
Figure imgb0003
 By calculation, we showed that the angle a was determined by the following formula:
Figure imgb0001
 in which a is the ratio
Figure imgb0002
 dimensions of the rectangle. The ratio is, by definition, greater than 1. In such a case, as shown in Figure 7, if we call x 'and y' the respective distances from the leading edge of the rectangular sheet to the start of the fold lines, we have:
Figure imgb0003

La largeur P de la feuille rectangulaire pliée est égale, dans ces conditions, à:

Figure imgb0004
The width P of the folded rectangular sheet is equal, under these conditions, to:
Figure imgb0004

Une fois les feuilles A et B pliées, il suffit de retourner une feuille sur deux. Dès lors, la seconde feuille référencée B peut être "entuilée" dans la première, de façon à ce que les parties de simple épaisseur soient superposés. (voir l'entuilage réalisé sur la figure 7).Once sheets A and B are folded, just turn every other sheet. Therefore, the second sheet referenced B can be "entuilée" in the first, so that the parts of simple thickness are superimposed. (see the covering made in figure 7).

Claims (8)

1. Feeding process of shredders with rectangular sheets of pulp supplied in bales, characterized in the deposition of the rectangular sheets one behind the other on a feed belt with their longitudinal axis set off by an angle a with respect to the moving direction of the belt, each sheet partially covering the next sheet and at least a side portion of each sheet is folded down by bending along a bending line parallel to the moving direction of the belt, the accurate superposition of the one- ply portion of the next sheets on the portions doubled by folding allowing the obtention of a mat having a constant thickness.
2. Feeding process according to claim 1, characterized by a being a 45° angle and by the folding down of two identical side portions of each sheet by bending along two bending lines parallel to the moving direction of the belt, the distance e between said lines being 1/12 and two successive sheets being spaced by x = L/√2, L and I respectively being the length and the width of the pulp sheet.
3. Feeding process according to claim 1, characterized by a being a 45° angle and by the folding down of two non identical side portions of each sheet by bending along two bending lines parallel to the moving direction of the belt and by a 180° plane rotation of every other rectangular sheet, the distance e between said lines being I/√2, and two successive sheets being spaced by x = L/√2, L and I respectively being the length and the width of the pulp sheet.
4. Feeding process of shredders according to claims 2 or 3 characterized by the successive deposition of the sheets one under the other, on the feed belt and by the folding down of the side-portions by an upright rotation.
5. Feeding process of shredders according to claim 4, characterized by the deposition of sheets having an "even rank" in such a way that the distance between the sheets of "even rank" equals x and the distance between sheets of "odd rank" equals x in order to obtain a mat with a uniform thickness being four times the thickness of a single sheet.
6. Feeding process of shredders according to claim 5 characterized by the deposition of said sheets one after the other with a constant shift equal to
Figure imgb0007
7. Feeding process according to claim 1 characterized by the folding of the rectangular sheets along the bisectrix of their most forward angle and by the 180° plane rotation of every other sheet, the distance between to successive sheets being equal to the width of the rectangular sheet according to the length of the sheets, a being a 45° angle.
8. Feeding process according to claim 1, characterized by an angle a smaller than 45°, a being a function of the ratio length/width of the rectangular sheet according to the following formula:
Figure imgb0008
and every other sheet being turned upside down in order to superpose the one ply portions.
EP79901573A 1978-12-22 1980-07-01 Process for feeding a shredder with pulp supplied in bales Expired EP0020600B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7836080A FR2444748A1 (en) 1978-12-22 1978-12-22 METHOD FOR SUPPLYING A DEFIBER
FR7836080 1978-12-22

Publications (2)

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EP0020600A1 EP0020600A1 (en) 1981-01-07
EP0020600B1 true EP0020600B1 (en) 1982-10-27

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EP (1) EP0020600B1 (en)
JP (1) JPS55501060A (en)
AT (1) ATE1717T1 (en)
BE (1) BE880553A (en)
CA (1) CA1123247A (en)
DE (1) DE2963957D1 (en)
DK (1) DK155841C (en)
ES (1) ES487219A1 (en)
FI (1) FI69127C (en)
FR (1) FR2444748A1 (en)
IT (1) IT1119629B (en)
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WO (1) WO1980001290A1 (en)

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FR2540895B1 (en) * 1983-02-15 1986-01-24 Beghin Say Sa PROCESS FOR SHORTENING TEXTILE FIBERS, IN PARTICULAR WHITE COTTON WASTE, FIBERS OBTAINED BY THIS PROCESS AND APPLICATION THEREOF AS ABSORBENT MATTRESS

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US1767860A (en) * 1929-07-18 1930-06-24 Fort Howard Paper Co Roll of interleaved sheets
US2688414A (en) * 1952-04-12 1954-09-07 Eastman Kodak Co Sheet pulp feeder
US3382778A (en) * 1966-02-01 1968-05-14 Tension Envelope Corp Method and apparatus for interleaving inserts during the envelope making process
US3701522A (en) * 1969-08-15 1972-10-31 Tzu Chiang Chi Process for folding sheet material and packaged dispensers therefor
US4081305A (en) * 1974-03-01 1978-03-28 Compagnie Des Etablissements De La Risle Multi-layer article and a process and an apparatus for its manufacture
US4118832A (en) * 1976-09-13 1978-10-10 Scott Paper Company Method for minimizing the accumulation of static charges on fibers resulting from fiberization of pulp lap sheets

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DK155841C (en) 1989-10-02
ES487219A1 (en) 1980-09-16
IT1119629B (en) 1986-03-10
FI69127B (en) 1985-08-30
IT7969462A0 (en) 1979-12-21
FR2444748A1 (en) 1980-07-18
NO151794C (en) 1985-06-05
NO151794B (en) 1985-02-25
BE880553A (en) 1980-04-01
FI69127C (en) 1985-12-10
JPS55501060A (en) 1980-12-04
EP0020600A1 (en) 1981-01-07
DE2963957D1 (en) 1982-12-02
NO794233L (en) 1980-06-24
US4384708A (en) 1983-05-24
DK155841B (en) 1989-05-22
DK353180A (en) 1980-08-15
CA1123247A (en) 1982-05-11
FI794026A (en) 1980-06-23
FR2444748B1 (en) 1981-05-22
ATE1717T1 (en) 1982-11-15
WO1980001290A1 (en) 1980-06-26

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