EP1172188A1 - Method and apparatus for perforationg non-woven webs - Google Patents
Method and apparatus for perforationg non-woven webs Download PDFInfo
- Publication number
- EP1172188A1 EP1172188A1 EP20010116915 EP01116915A EP1172188A1 EP 1172188 A1 EP1172188 A1 EP 1172188A1 EP 20010116915 EP20010116915 EP 20010116915 EP 01116915 A EP01116915 A EP 01116915A EP 1172188 A1 EP1172188 A1 EP 1172188A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- insert
- rotation
- perforation
- translation
- sharp edge
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
- B26F1/00—Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
- B26F1/02—Perforating by punching, e.g. with relatively-reciprocating punch and bed
- B26F1/06—Perforating by punching, e.g. with relatively-reciprocating punch and bed with punching tools moving with the work
- B26F1/10—Roller type punches
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
- B26D7/00—Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
- B26D7/26—Means for mounting or adjusting the cutting member; Means for adjusting the stroke of the cutting member
- B26D7/2614—Means for mounting the cutting member
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
- B26F1/00—Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
- B26F1/02—Perforating by punching, e.g. with relatively-reciprocating punch and bed
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
- B26F1/00—Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
- B26F1/02—Perforating by punching, e.g. with relatively-reciprocating punch and bed
- B26F1/06—Perforating by punching, e.g. with relatively-reciprocating punch and bed with punching tools moving with the work
- B26F1/08—Perforating by punching, e.g. with relatively-reciprocating punch and bed with punching tools moving with the work wherein the tools are carried by, and in operation move relative to, a rotative drum or similar support
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
- B26F1/00—Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
- B26F1/02—Perforating by punching, e.g. with relatively-reciprocating punch and bed
- B26F1/14—Punching tools; Punching dies
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
- B26F1/00—Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
- B26F1/16—Perforating by tool or tools of the drill type
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- 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
- Y10T83/00—Cutting
- Y10T83/04—Processes
- Y10T83/0481—Puncturing
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- 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
- Y10T83/00—Cutting
- Y10T83/04—Processes
- Y10T83/0515—During movement of work past flying cutter
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- 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
- Y10T83/00—Cutting
- Y10T83/465—Cutting motion of tool has component in direction of moving work
- Y10T83/4766—Orbital motion of cutting blade
- Y10T83/4795—Rotary tool
- Y10T83/4812—Compound movement of tool during tool cycle
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- 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
- Y10T83/00—Cutting
- Y10T83/465—Cutting motion of tool has component in direction of moving work
- Y10T83/4766—Orbital motion of cutting blade
- Y10T83/4795—Rotary tool
- Y10T83/483—With cooperating rotary cutter or backup
- Y10T83/4836—With radial overlap of the cutting members
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- 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
- Y10T83/00—Cutting
- Y10T83/465—Cutting motion of tool has component in direction of moving work
- Y10T83/4766—Orbital motion of cutting blade
- Y10T83/4795—Rotary tool
- Y10T83/483—With cooperating rotary cutter or backup
- Y10T83/4844—Resiliently urged cutter or anvil member
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- 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
- Y10T83/00—Cutting
- Y10T83/929—Tool or tool with support
- Y10T83/9372—Rotatable type
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- 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
- Y10T83/00—Cutting
- Y10T83/929—Tool or tool with support
- Y10T83/9372—Rotatable type
- Y10T83/9387—Punching tool
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- 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
- Y10T83/00—Cutting
- Y10T83/929—Tool or tool with support
- Y10T83/9372—Rotatable type
- Y10T83/9387—Punching tool
- Y10T83/9389—Shear type
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- 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
- Y10T83/00—Cutting
- Y10T83/929—Tool or tool with support
- Y10T83/9372—Rotatable type
- Y10T83/9408—Spaced cut forming tool
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- 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
- Y10T83/00—Cutting
- Y10T83/929—Tool or tool with support
- Y10T83/9411—Cutting couple type
- Y10T83/9423—Punching tool
- Y10T83/9425—Tool pair
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- 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
- Y10T83/00—Cutting
- Y10T83/929—Tool or tool with support
- Y10T83/9411—Cutting couple type
- Y10T83/9423—Punching tool
- Y10T83/944—Multiple punchings
Definitions
- the present invention relates to the field of non-tablecloths woven, consisting of fibers or filaments, intended, in particular but not exclusively, to be used for the production of articles hygiene, for example, for baby diapers or for adult incontinence or female protections. She relates more particularly to a method of perforating a non-woven web and a device suitable for implementing this process.
- the document EP-A-0214608 describes a method of perforation a nonwoven which specifically contains fibers or thermoplastic filaments.
- This process consists of perforating the sheet nonwoven by means of a plurality of needles which cooperate with a plurality of recesses. Under the action of needles, the fibers of the non-woven tablecloth are locally repelled and in order to preserve the vacuum thus formed, the studs and the contour of the recesses are heated so as to cause the fusion of the thermoplastic fibers. After hardening of the molten fibers, a perforation is obtained having the shape of the needle and whose contours are delimited and consolidated by fused fibers and therefore linked to each other.
- This method has the drawback, on the one hand of requiring the use of a nonwoven containing thermoplastic fibers and on the other hand, to bring a certain rigidity to the nonwoven due to the presence of hardened areas at the periphery of the perforations.
- the document EP-A-0974433 describes another type of process for perforation of a nonwoven web.
- the sheet is pushed by a perforating member inside an orifice opening out into a thin room so that the nonwoven web exceeds beyond this orifice.
- Organs of cut positioned inside the thin piece come then cut the fibers protruding beyond said piece so as to form perforations.
- the perforating member is a stud cylindrical with a hemispherical end, which is designed to be driven simultaneously in translation along its longitudinal axis and rotating on itself. This piercing member is not intended function of cutting the fibers or filaments of the web, this function being provided by the cutting members.
- This process requires a relatively complex device including a cylinder hollow whose interior is provided with cutting members and imposes the use of a thin piece in which are provided the orifices. In addition, this process does not guarantee perforations with a clear and reproducible contour in the time.
- the aim of the present invention is to propose a new method of perforating a nonwoven web of fibers or filaments which in particular overcomes all or part of the disadvantages associated with the use of the methods of the prior art.
- the process of the invention is known, in particular from the application EP-A-0974433, in that it brings the nonwoven web in contact with a perforated cylinder, and at least one perforation in the sheet by means of at least one perforation which is driven simultaneously in translation and rotation on itself.
- the Applicant has highlighted that the fact of putting using a sharp edge formed in plane (flat end surface of the insert), in combination with a perforating member driven in rotation on itself, advantageously allows to cut by shearing the fibers or filaments of the nonwoven web over the entire perimeter of the sharp edge, and thus makes it possible to obtain perforations with a sharp outline.
- a sharp edge formed in plane flat end surface of the insert
- a perforating member driven in rotation on itself advantageously allows to cut by shearing the fibers or filaments of the nonwoven web over the entire perimeter of the sharp edge, and thus makes it possible to obtain perforations with a sharp outline.
- the orifices of this cylinder in said external surface are not perfectly planar.
- the present invention also relates to a device for perforation of a nonwoven web which allows the implementation of the aforementioned perforation method of the invention.
- the device 1 designed for the perforation of a nonwoven web comprises a first cylinder 2 which is a perforated cylinder. This cylinder 2 is rotated (arrow F) around its longitudinal axis 3.
- the device 1 also comprises a second cylinder 4 driven in rotation (arrow F ') about its longitudinal axis 5 parallel to the axis 3 of the first cylinder 2.
- the first perforated cylinder 2 has on its periphery exterior a cylindrical part 6 provided with a plurality of 7 through holes. These perforations 7 are aligned according to the axis of the cylinder in the form of parallel rows distributed over all the periphery of the cylinder. Each hole 7 is equipped a removable insert 8 which will be more fully described with reference to Figure 2. In another alternative embodiment, the part 6 could be deleted and replaced directly by the perforated wall of the cylinder 2.
- the second cylinder 4 is provided on its periphery with studs 9 which are arranged to cooperate with the inserts 8 of the perforations 7 made in the outer part 6 of the first cylinder 2.
- cylinder 2 has also a fixed suction zone A which is delimited by the walls A1 and A2, and which allows the sheet N to be pressed against the first face 6a of the part 6 and to evacuate the pieces M of the tablecloth that have been cut out.
- each insert 8 comprises a body 8a provided with a recess (or perforation) 8b having a section circular.
- This recess 8b is through in the example shown, but could also according to the invention have a background, to the opposite of its external orifice 8i.
- the external surface 8c of the body 8a is equipped with a thread 8d which cooperates with a reverse thread 7a made inside each perforation 7 in order to fix each insert 8 in a perforation 7.
- the body 8a has at one of its ends a flange 8e having a flat external surface (S), into which opens the recess 8b (orifice 8i).
- the 8th flange can advantageously serve as a gripping means for fixing or removing the inserts 8 in the perforations 7.
- the insert 8 does not have a flange 8e and the recess 8b opens out at a flat end 8h of the insert.
- Such an insert presents well a sharp edge 8g formed by the intersection of the internal surface 8f of the perforation 8b with the end 8h of the insert 8, which 8h end forms a flat surface (S), which corresponds to the thickness of body 8a.
- the perforations 7 have a increasing diameter from the first face 6a of the part 6 towards the second face 6b of the latter; the recess of each insert 8 has an increasing diameter from the sharp edge 8g.
- the flared shape of the resulting recess 8 makes it easier to remove the pieces M of the recesses 8b.
- This additional feature can also be applied to a variant with flanged inserts, like the one in Figure 2.
- the pad 9 is mounted in an outer part 10 of the second cylinder 4 via a housing 11 at the bottom of which is a spring 12.
- the stud 9 is a axis cylinder 9a which is arranged in the housing 11 so that it turns on itself (along its axis 9a) when it moves in the direction arrow H (i.e. in a direction parallel to its axis of rotation and in the opposite direction to the perforated cylinder 2). More precisely the stud 9 is provided with a pin 13 projecting inside of the housing 11, this pin penetrating into a slide 14 formed in the wall of the housing 11 and which is inclined relative to the direction H of displacement in translation of the pad 9.
- the pin 13 is correlatively moves in the slide 14. Due to the inclination of the slide 14, the stud 9 performs a slight rotation on itself in a first direction of rotation R1 during its displacement in translation in the direction H, and in a second direction of rotation R2 during its displacement in the direction G opposite to H, i.e. in the direction of the perforated cylinder 2.
- the thread 8d equipping each of the inserts 8 is such that the displacement in rotation in the R1 direction of the studs 9 tightens the fixing of each of the inserts 8 in the perforations 7.
- the stud 9 has a rounded end 9b, of the type hemispherical, and a diameter D slightly larger than the diameter d orifice 8i of the recess 8b of the insert 8, so as to be able press the sheet N between said hemispherical end 9b and the edge vivid 8g of insert 8, which makes it possible to locally cut the tablecloth NOT.
- the two cylinders 2 and 4 are rotated (arrows F and F '/ Figures 2 and 3), being synchronized with each other by such that the hemispherical end 9b of a stud 9 comes apply precisely to the sharp edge 8g of the insert 8 with which it cooperates to locally perform a perforation in the sheet N.
- the stud is simultaneously rotated in the opposite direction R2 to R1 (second phase / plot on the right in Figures 2 and 3).
- the end of the stud 9 penetrates slightly inside the recess 8b of the corresponding insert 8, by locally pushing back the portion (P) the tablecloth N located at the right of said recess 8b, and presses said portion (P) of sheet against the sharp edge 8g.
- the hemispherical end of a stud 9 being of a diameter D greater than that d of the recess 8b, and the edge 8g in a flat area (flat surface S of the 8th flange or 8h end of the insert), the N sheet is therefore locally compressed against the sharp edge 8g and thus cut by shearing fibers or filaments constituting the N sheet, under the actions combined rotation (in both directions of rotation R1 and R2) of the pad 9 and pressure between this pad 9 and the edge 8g.
- each insert 8 has a surface (S) which is flat.
- the plaintiff has evidence that when the surface of the 8th flange that comes into contact with the tablecloth N is not strictly flat, but is by slightly curved such as for example that the surface of the cylinder perforated 2, it seems, without the plaintiff being bound by this explanation, that it is not possible to get a contact sufficient between the end of stud 9 and the entire perimeter of the sharp edge 8g, so it is not possible to press uniformly and sufficiently the tablecloth N against the sharp edge 8g of insert 8, to obtain the cutting of an integral portion (P) of tablecloth.
- the invention advantageously makes it possible to produce in the sheet non-woven perforations that have a sharp outline and reproducible, without the need to heat the filaments or of the tablecloth.
- the invention advantageously allows make perforations with a circular outline.
- a hydrophobic nonwoven web such as that frequently used for the realization of hygiene articles, it is important that the perforations made in this sheet are circular. Indeed, only circular perforations allow water or any other liquid to pass through the hydrophobic nonwoven without wetting the surface of the latter, which makes it possible to absorb a liquid while having a dry surface.
- the removable nature of the inserts allows advantageously to overcome at a lower cost the wear problems of inserts, and in particular their sharp edge 8g.
- an insert 8 When an insert 8 is, it just replace it with a new insert.
- the invention is however not limited to the use of inserts which are removable.
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Forests & Forestry (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Nonwoven Fabrics (AREA)
- Absorbent Articles And Supports Therefor (AREA)
- Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
- Treatment Of Fiber Materials (AREA)
Abstract
Description
La présente invention concerne le domaine des nappes non tissées, constituées de fibres ou de filaments, destinées, notamment mais non exclusivement, à être utilisées pour la réalisation d'articles d'hygiène, par exemple, pour des couches-culottes pour bébés ou pour incontinents adultes ou encore des protections féminines. Elle concerne plus particulièrement un procédé de perforation d'une nappe non tissée et un dispositif adapté à la mise en oeuvre de ce procédé.The present invention relates to the field of non-tablecloths woven, consisting of fibers or filaments, intended, in particular but not exclusively, to be used for the production of articles hygiene, for example, for baby diapers or for adult incontinence or female protections. She relates more particularly to a method of perforating a non-woven web and a device suitable for implementing this process.
Il existe différents procédés de perforation de nappes non tissées.There are different methods of perforating non-tablecloths woven.
Le document EP-A-0214608 décrit un procédé de perforation d'un non-tissé qui comporte, de manière spécifique des fibres ou filaments thermoplastiques. Ce procédé consiste à perforer la nappe non tissée au moyen d'une pluralité d'aiguilles qui coopèrent avec une pluralité d'évidements. Sous l'action des aiguilles, les fibres de la nappe non tissée sont localement repoussées et afin de conserver le vide ainsi formé, les plots et le contour des évidements sont chauffés en sorte de provoquer la fusion des fibres thermoplastiques. Après durcissement des fibres fondues, on obtient une perforation ayant la forme de l'aiguille et dont les contours sont délimités et consolidés par des fibres fondues et donc liées les unes au autres.The document EP-A-0214608 describes a method of perforation a nonwoven which specifically contains fibers or thermoplastic filaments. This process consists of perforating the sheet nonwoven by means of a plurality of needles which cooperate with a plurality of recesses. Under the action of needles, the fibers of the non-woven tablecloth are locally repelled and in order to preserve the vacuum thus formed, the studs and the contour of the recesses are heated so as to cause the fusion of the thermoplastic fibers. After hardening of the molten fibers, a perforation is obtained having the shape of the needle and whose contours are delimited and consolidated by fused fibers and therefore linked to each other.
Ce procédé présente l'inconvénient, d'une part de nécessiter l'utilisation d'un non-tissé contenant des fibres thermoplastiques et d'autre part, d'apporter une certaine rigidité au non-tissé du fait de la présence des zones durcies à la périphérie des perforations.This method has the drawback, on the one hand of requiring the use of a nonwoven containing thermoplastic fibers and on the other hand, to bring a certain rigidity to the nonwoven due to the presence of hardened areas at the periphery of the perforations.
Le document EP-A-0974433 décrit un autre type de procédé de perforation d'une nappe non tissée. Selon ce procédé, la nappe est poussée par un organe de perforation à l'intérieur d'un orifice débouchant ménagé dans une pièce de faible épaisseur en sorte que la nappe non tissée dépasse au-delà de cet orifice. Des organes de coupe positionnés à l'intérieur de la pièce de faible épaisseur viennent ensuite couper les fibres dépassant au delà de ladite pièce en sorte de former des perforations. L'organe de perforation est un plot cylindrique dont l'extrémité est hémisphérique, et qui est conçu pour être entraíné simultanément en translation selon son axe longitudinal et en rotation sur lui même. Cet organe de perforation n'a pas pour fonction de couper les fibres ou filaments de la nappe, cette fonction étant assurée par les organes de coupe. Ce procédé nécessite un dispositif relativement complexe comportant notamment un cylindre creux dont l'intérieur est muni d'organes de coupe et impose l'utilisation d'une pièce de faible épaisseur dans laquelle sont ménagés les orifices. De plus, ce procédé ne permet pas de garantir des perforations présentant un contour net et reproductible dans le temps.The document EP-A-0974433 describes another type of process for perforation of a nonwoven web. According to this process, the sheet is pushed by a perforating member inside an orifice opening out into a thin room so that the nonwoven web exceeds beyond this orifice. Organs of cut positioned inside the thin piece come then cut the fibers protruding beyond said piece so as to form perforations. The perforating member is a stud cylindrical with a hemispherical end, which is designed to be driven simultaneously in translation along its longitudinal axis and rotating on itself. This piercing member is not intended function of cutting the fibers or filaments of the web, this function being provided by the cutting members. This process requires a relatively complex device including a cylinder hollow whose interior is provided with cutting members and imposes the use of a thin piece in which are provided the orifices. In addition, this process does not guarantee perforations with a clear and reproducible contour in the time.
Le but de la présente invention est de proposer un nouveau procédé de perforation d'une nappe non tissée de fibres ou de filaments qui pallie notamment tout ou partie des inconvénients liés à l'utilisation des procédés de l'art antérieur.The aim of the present invention is to propose a new method of perforating a nonwoven web of fibers or filaments which in particular overcomes all or part of the disadvantages associated with the use of the methods of the prior art.
Le procédé de l'invention est connu, notamment par la demande de brevet EP-A-0974433, en ce qu'on amène la nappe non tissée en contact avec un cylindre perforé, et on réalise au moins une perforation dans la nappe au moyen d'au moins un organe de perforation qui est entraíné simultanément en translation et en rotation sur lui même.The process of the invention is known, in particular from the application EP-A-0974433, in that it brings the nonwoven web in contact with a perforated cylinder, and at least one perforation in the sheet by means of at least one perforation which is driven simultaneously in translation and rotation on itself.
De manière caractéristique selon l'invention, on fixe préalablement sur le cylindre perforé au moins un insert, comprenant à une extrémité une surface plane, et pourvu d'un évidement qui débouche dans ladite surface plane, et qui présente une arête vive formée par l'intersection de la surface interne dudit évidement avec ladite surface plane ; une perforation dans la nappe non tissée est obtenue en découpant une portion de la nappe non tissée par cisaillement des fibres ou filaments de la nappe non tissée, entre l'arête vive dudit insert et un organe de perforation entraíné simultanément en translation et en rotation sur lui même.Characteristically according to the invention, one fixes previously on the perforated cylinder at least one insert, comprising at one end a flat surface, and provided with a recess which opens into said flat surface, and which has a sharp edge formed by the intersection of the internal surface of said recess with said planar surface; a perforation in the nonwoven web is obtained by cutting a portion of the nonwoven web by shearing of the fibers or filaments of the nonwoven web, between the sharp edge of said insert and a driven perforation member simultaneously in translation and in rotation on itself.
La Demanderesse a mis en évidence que le fait de mettre en oeuvre une arête vive formée dans plan (surface plane d'extrémité de l'insert), en combinaison avec un organe de perforation entraíné en rotation sur lui même, permet avantageusement de couper par cisaillement les fibres ou filaments de la nappe non tissée sur tout le périmètre de l'arête vive, et permet ainsi d'obtenir des perforations présentant un contour net. Comparativement, dans un dispositif tel que celui décrit dans la demande de brevet européen EP-A-0974433 précitée, du fait de la courbure de la face externe du cylindre perforée (face au contact de laquelle est amenée la nappe), les orifices de ce cylindre dans ladite surface externe ne sont pas parfaitement plans. Il en résulte en pratique qu'il n'est pas possible, au moyen des organes de perforation (plots) de ce dispositif, de cisailler les fibres ou filaments de la nappe non tissée sur tout le pourtour desdits orifices. Ainsi, contrairement à l'invention, dans ce dispositif de l'art antérieur, on est obligé de prévoir à l'intérieur du cylindre un organe de coupe (référencé 16 sur la figure 1 de EP-A-0974433), qui permet de couper les portions de nappe qui sont repoussées à l'intérieur du cylindre perforé par les organes (plots) de perforation.The Applicant has highlighted that the fact of putting using a sharp edge formed in plane (flat end surface of the insert), in combination with a perforating member driven in rotation on itself, advantageously allows to cut by shearing the fibers or filaments of the nonwoven web over the entire perimeter of the sharp edge, and thus makes it possible to obtain perforations with a sharp outline. Comparatively, in a device such than that described in European patent application EP-A-0974433 above, due to the curvature of the outer face of the perforated cylinder (facing the contact from which the sheet is brought), the orifices of this cylinder in said external surface are not perfectly planar. he this results in practice that it is not possible, by means of the organs perforation (pads) of this device, shearing the fibers or filaments of the nonwoven web around the entire periphery of said orifices. Thus, unlike the invention, in this device of the prior art, we are obliged to provide a cutting member inside the cylinder (referenced 16 in FIG. 1 of EP-A-0974433), which allows cutting the portions of tablecloth which are pushed back inside the cylinder perforated by the perforating bodies (studs).
La présente invention a également pour objet un dispositif de perforation d'une nappe non tissée qui permet la mise en oeuvre du procédé de perforation précité de l'invention.The present invention also relates to a device for perforation of a nonwoven web which allows the implementation of the aforementioned perforation method of the invention.
La présente invention sera mieux comprise et ses caractéristiques et avantages apparaítront plus clairement à la lecture de la description qui suit et fait référence aux dessins annexés représentant un mode de réalisation préféré du dispositif de la présente invention, présenté à titre d'exemple non limitatif et sur lesquels :
- la figure 1 est une représentation schématique partielle en coupe du mode de réalisation préféré de la présente invention
- la figure 2 est une vue partielle agrandie du dispositif de la figure 1, dans la zone où un plot coopère avec un orifice du premier cylindre en vue de perforer la nappe non tissée; et
- la figure 3 représente une variante de réalisation du dispositif de l'invention.
- Figure 1 is a partial schematic representation in section of the preferred embodiment of the present invention
- Figure 2 is an enlarged partial view of the device of Figure 1, in the area where a pad cooperates with an orifice of the first cylinder in order to perforate the nonwoven web; and
- Figure 3 shows an alternative embodiment of the device of the invention.
Le mode de réalisation préféré du dispositif de la présente invention va maintenant être décrit en référence à la figure 1.The preferred embodiment of the device of the present The invention will now be described with reference to FIG. 1.
Le dispositif 1 conçu pour la perforation d'une nappe non tissée comporte un premier cylindre 2 qui est un cylindre perforé. Ce cylindre 2 est entraíné en rotation (flèche F) autour de son axe longitudinal 3. Le dispositif 1 comporte également un second cylindre 4 entraíné en rotation (flèche F') autour de son axe longitudinal 5 parallèle à l'axe 3 du premier cylindre 2.The device 1 designed for the perforation of a nonwoven web comprises a first cylinder 2 which is a perforated cylinder. This cylinder 2 is rotated (arrow F) around its longitudinal axis 3. The device 1 also comprises a second cylinder 4 driven in rotation (arrow F ') about its longitudinal axis 5 parallel to the axis 3 of the first cylinder 2.
Le premier cylindre 2 perforé comporte sur sa périphérie
extérieure une pièce cylindrique 6 munie d'une pluralité de
perforations 7 traversantes. Ces perforations 7 sont alignées selon
l'axe du cylindre sous la forme de rangées parallèles réparties sur
toutes la périphérie du cylindre. Chaque perforation 7 est équipée
d'un insert 8 amovible qui sera plus amplement décrit en référence à
la figure 2. Dans une autre variante de réalisation, la pièce 6 pourrait
être supprimée et être remplacée directement par la paroi perforée du
cylindre 2.The first perforated cylinder 2 has on its periphery
exterior a cylindrical part 6 provided with a plurality of
7 through holes. These
Le second cylindre 4 est muni sur sa périphérie de plots 9 qui
sont agencés pour coopérer avec les inserts 8 des perforations 7
pratiquées dans la pièce extérieure 6 du premier cylindre 2. Dans le
mode de réalisation préféré ici représenté, le cylindre 2 comporte
également une zone d'aspiration A fixe qui est délimitée par les parois
A1 et A2, et qui permet de plaquer par aspiration la nappe N contre la
première face 6a de la pièce 6 et d'évacuer les morceaux M de la
nappe qui ont été découpés.The second cylinder 4 is provided on its periphery with
En référence à la figure 2, chaque insert 8 comprend un corps 8a
munie d'un évidement (ou perforation) 8b présentant une section
circulaire. Cet évidement 8b est traversant dans l'exemple représenté,
mais pourrait également selon l'invention présenter un fond, à
l'opposé de son orifice extérieur 8i. La surface externe 8c du corps 8a
est équipée d'un filetage 8d qui coopère avec un filetage inverse 7a
réalisé à l'intérieur de chaque perforation 7 afin de fixer chaque insert
8 dans une perforation 7. Le corps 8a comporte à une de ses
extrémités une collerette 8e présentant une surface externe plane (S),
dans laquelle débouche l'évidement 8b ( orifice 8i). La surface plane
(S) de la collerette 8e forme, avec la surface interne 8f de l'évidement
8b, une arête vive 8g. La collerette 8e peut avantageusement servir de
moyen de préhension pour la fixation ou le retrait des inserts 8 dans
les perforations 7.Referring to Figure 2, each
Dans une variante de réalisation représentée sur la figure 3,
l'insert 8 ne comporte pas de collerette 8e et l'évidement 8b débouche
au niveau d'une extrémité plane 8h de l'insert. Un tel insert présente
bien une arête vive 8g formée par l'intersection de la surface interne
8f de la perforation 8b avec l'extrémité 8h de l'insert 8, laquelle
extrémité 8h forme une surface plane (S), qui correspond à l'épaisseur
du corps 8a. Dans cette variante, les perforations 7 présentent un
diamètre croissant depuis la première face 6a de la pièce 6 vers la
deuxième face 6b de cette dernière; l'évidement de chaque insert 8
présente un diamètre croissant depuis l'arête vive 8g. La forme évasée
de l'évidement 8 qui en résulte permet de faciliter le retrait des
morceaux M des évidements 8b. Cette caractéristique additionnelle
peut également être appliquée à une variante avec inserts à collerette,
du type de celle de la figure 2.In an alternative embodiment shown in FIG. 3,
the
Dans une variante de réalisation des moyens de découpe de la
nappe non tissée représentée sur la figure 2, le plot 9 est monté dans
une pièce extérieure 10 du second cylindre 4 par l'intermédiaire d'un
logement 11 au fond duquel est disposé un ressort 12. Le plot 9 est un
cylindre d'axe 9a qui est agencé dans le logement 11 en sorte qu'il
tourne sur lui-même (selon son axe 9a) lorsqu'il se déplace dans le sens
de la flèche H (c'est-à-dire dans une direction parallèle à son axe de
rotation et dans le sens opposé au cylindre perforé 2 ). Plus
précisément le plot 9 est muni d'une goupille 13 en saillie à l'intérieur
du logement 11, cette goupille pénétrant dans une coulisse 14 formée
dans la paroi du logement 11 et qui est inclinée par rapport à la
direction H de déplacement en translation du plot 9.In an alternative embodiment of the means for cutting the
nonwoven web shown in FIG. 2, the
Lors du déplacement en translation du plot 9, la goupille 13 se
déplace corrélativement dans la coulisse 14. Du fait de l'inclinaison de
la coulisse 14, le plot 9 effectue une légère rotation sur lui-même dans
un premier sens de rotation R1 lors de son déplacement en translation
dans la direction H, et dans un second sens de rotation R2 lors de son
déplacement dans le direction G opposée à H, c'est-à-dire en direction
du cylindre perforé 2. Dans ce mode de réalisation préféré, le filetage
8d équipant chacun des inserts 8 est tel que le déplacement en
rotation dans le sens R1 des plots 9 resserre la fixation de chacun des
inserts 8 dans les perforations 7.During the translational movement of the
Le plot 9 présente une extrémité arrondie 9b, de type
hémisphérique, et un diamètre D légèrement supérieur au diamètre d
de l'orifice 8i de l'évidement 8b de l'insert 8, en sorte de pouvoir
presser la nappe N entre ladite extrémité hémisphérique 9b et l'arête
vive 8g de l'insert 8, ce qui permet de découper localement la nappe
N.The
Le fonctionnement du dispositif de l'invention va maintenant être à présent être expliqué.The operation of the device of the invention will now now be explained.
Les deux cylindres 2 et 4 sont entraínés en rotation (flèches F et
F'/ figures 2 et 3), en étant synchronisés l'un par rapport à l'autre de
telle sorte que l'extrémité hémisphérique 9b d'un plot 9 vient
s'appliquer précisément sur l'arête vive 8g de l'insert 8 avec lequel il
coopère pour réaliser localement une perforation dans la nappe N.The two cylinders 2 and 4 are rotated (arrows F and
F '/ Figures 2 and 3), being synchronized with each other by
such that the
Du fait de la rotation des cylindres 2 et 4, dans une première
phase, le plot 9 arrive au contact de l'insert 8 et est repoussé au
contact de cet insert 8 dans la direction H (plot de gauche sur les
figures 2 et 3), le ressort 12 étant comprimé. Au cours de ce premier
mouvement de translation dans la direction H, le plot est
simultanément entraíné en rotation dans la direction R1. Lorsque le
plot 9 et l'insert 8 sont parfaitement alignés (fin de la première phase /
plot central des figures 2 et 3), la compression du ressort est
maximale, et l'extrémité hémisphérique 9b du plot 9 s'applique
parfaitement sur l'arête vive 8g de l'insert 8. Ensuite, dans une
seconde phase, du fait de la rotation des deux cylindres, l'insert 8 et le
plot 9 quittent leur position alignée. Dans cette seconde phase, le
ressort exerce sur le plot 9 une force de rappel qui permet de
l'entraíner en translation dans la direction G opposée à la direction H. Due to the rotation of cylinders 2 and 4, in a first
phase, the
Au cours de ce second mouvement de translation dans la direction G,
le plot est simultanément entraíné en rotation dans le sens R2 opposé
à R1 (seconde phase/ plot de droite sur les figures 2 et 3).
Au cours des deux phases précitées, l'extrémité du plot 9 pénètre
légèrement à l'intérieur de l'évidement 8b de l'insert 8 correspondant,
en repoussant localement la portion (P) la nappe N située au droit
dudit évidement 8b, et presse ladite portion (P) de nappe contre
l'arête vive 8g. L'extrémité hémisphérique d'un plot 9 étant d'un
diamètre D supérieur à celui d de l'évidement 8b, et l'arête 8g
s'inscrivant dans une zone plane (surface plane S de la collerette 8e ou
de l'extrémité 8h de l'insert), la nappe N est donc localement
compressée contre l'arête vive 8g et ainsi découpée par cisaillement
des fibres ou filaments constitutifs de la nappe N, sous les actions
combinées de rotation (dans les deux sens de rotation R1 et R2) du
plot 9 et de pression entre ce plot 9 et l'arête 8g.During this second translational movement in direction G,
the stud is simultaneously rotated in the opposite direction R2
to R1 (second phase / plot on the right in Figures 2 and 3).
During the two aforementioned phases, the end of the
Selon l'invention, il est important que chaque insert 8 présente
une surface (S) qui soit plane. En effet, la demanderesse a mis en
évidence que lorsque la surface de la collerette 8e qui entre en contact
avec la nappe N n'est pas rigoureusement plane, mais est par
légèrement courbe tel que par exemple que la surface du cylindre
perforée 2, il semble, sans toutefois que la demanderesse ne soit liée
par cette explication, qu'il n'est pas possible d'obtenir un contact
suffisant entre l'extrémité du plot 9 et la totalité du périmètre de
l'arête vive 8g, de sorte qu'il n'est pas possible de presser
uniformément et suffisamment la nappe N contre l'arête vive 8g de
l'insert 8, pour obtenir la découpe d'une portion intégrale (P) de
nappe.According to the invention, it is important that each
L'invention permet avantageusement de réaliser dans la nappe non tissée des perforations qui présentent un contour net et reproductible, sans qu'il soit nécessaire de chauffer les ou filaments de la nappe. En particulier, l'invention permet avantageusement de réaliser des perforations présentant un contour circulaire. Or, dans le cas d'une nappe non-tissée hydrophobe tel que celle fréquemment utilisée pour la réalisation d'articles d'hygiène, il est important que les perforations réalisées dans cette nappe soient circulaires. En effet, seules des perforations circulaires permettent à l'eau ou à tout autre liquide de traverser le non tissé hydrophobe sans mouiller la surface de ce dernier, ce qui permet d'absorber un liquide tout en ayant une surface sèche.The invention advantageously makes it possible to produce in the sheet non-woven perforations that have a sharp outline and reproducible, without the need to heat the filaments or of the tablecloth. In particular, the invention advantageously allows make perforations with a circular outline. Now in the case of a hydrophobic nonwoven web such as that frequently used for the realization of hygiene articles, it is important that the perforations made in this sheet are circular. Indeed, only circular perforations allow water or any other liquid to pass through the hydrophobic nonwoven without wetting the surface of the latter, which makes it possible to absorb a liquid while having a dry surface.
Plus particulièrement, le caractère amovible des inserts permet
avantageusement de pallier à moindre coût aux problèmes d'usure des
inserts, et notamment de leur arête vive 8g. Lorsqu'un insert 8 est, il
suffit de le remplacer, par un insert neuf. L'invention n'est toutefois
pas limitée à la mise en oeuvre d'inserts qui sont amovibles.More particularly, the removable nature of the inserts allows
advantageously to overcome at a lower cost the wear problems of
inserts, and in particular their
Claims (14)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SI200130004T SI1172188T1 (en) | 2000-07-12 | 2001-07-11 | Method and apparatus for perforating non-woven webs |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0009114A FR2811604A1 (en) | 2000-07-12 | 2000-07-12 | Non-woven sheet material perforating procedure and machine uses cylinder with sharp-edged hollow inserts and roller with perforating fingers |
FR0009106A FR2811603A1 (en) | 2000-07-12 | 2000-07-12 | Non-woven sheet material perforating procedure and machine uses cylinder with sharp-edged hollow inserts and roller with perforating fingers |
FR0009114 | 2000-07-12 | ||
FR0009106 | 2000-07-12 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1172188A1 true EP1172188A1 (en) | 2002-01-16 |
EP1172188B1 EP1172188B1 (en) | 2002-10-02 |
Family
ID=26212530
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20010116915 Expired - Lifetime EP1172188B1 (en) | 2000-07-12 | 2001-07-11 | Method and apparatus for perforating non-woven webs |
Country Status (7)
Country | Link |
---|---|
US (2) | US7080584B2 (en) |
EP (1) | EP1172188B1 (en) |
AT (1) | ATE225239T1 (en) |
DE (1) | DE60100033T2 (en) |
DK (1) | DK1172188T3 (en) |
ES (1) | ES2184723T3 (en) |
PT (1) | PT1172188E (en) |
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Cited By (5)
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ITFE20100008A1 (en) * | 2010-06-24 | 2011-12-25 | Massimo Berveglieri | CUTTER FOR DRILLING INSULATING PANELS IN KENAF FIBER |
CN102825440A (en) * | 2012-09-19 | 2012-12-19 | 常州市南方卫生器材厂有限公司 | Manufacturing process of cutter for punching adhesive tape |
CN105014743A (en) * | 2015-07-29 | 2015-11-04 | 上汽通用五菱汽车股份有限公司 | Reversing radar punching device |
EP3670122A1 (en) * | 2018-12-21 | 2020-06-24 | Tetra Laval Holdings & Finance S.A. | A male punch tool, and a punch device |
CN111360699A (en) * | 2020-04-10 | 2020-07-03 | 宁波华望信息科技有限公司 | High cutting device is used in valve processing of security |
Also Published As
Publication number | Publication date |
---|---|
DE60100033D1 (en) | 2002-11-07 |
PT1172188E (en) | 2003-02-28 |
ES2184723T3 (en) | 2003-04-16 |
US7080584B2 (en) | 2006-07-25 |
US20020088321A1 (en) | 2002-07-11 |
DE60100033T2 (en) | 2003-07-10 |
US20060201305A1 (en) | 2006-09-14 |
DK1172188T3 (en) | 2002-10-28 |
ATE225239T1 (en) | 2002-10-15 |
EP1172188B1 (en) | 2002-10-02 |
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