FR2481328A1 - PROCESS FOR MANUFACTURING A TISSUE FABRIC OUATE CREPE - Google Patents

Abstract

THE INVENTION RELATES TO A PROCESS FOR MANUFACTURING AN ARTICLE OF CREPE WADDING FABRIC. THE PROBLEM IS TO FACILITATE THE CLEANING OF THE TRANSFER CANVAS. FOLLOWING THE INVENTION, THE PROCESS CONSISTS OF FORMING A CONTINUOUS TABLECLOTH 46 OF WADDING FABRIC BETWEEN A FORMING CANVAS 44 AND A TRANSFER DRAINING CANVAS 42, IN REMOVING THE WATER BY COMPRESSION BETWEEN THESE CANVAS, IN TRAINING IT ON THE CANVAS. DRAINING UNTIL A FIRST CYLINDRICAL DRYING DEVICE, TO TAKE IT AS A SANDWICH BETWEEN THIS DRAINING CLOTH AND A HOLDER CLOTH 60 TO TRAIN IT AROUND THIS DRYING DEVICE, TO TRANSFER IT TO A SECOND CYLINDRICAL DRYING DEVICE 72 AND TO CREATE IT BY SEPARATING IT FROM THIS DEVICE BY MEANS OF A SQUEEGEE. THE INVENTION IS PRIMARILY USED TO MAKE SOFT AND SWALLOWING WADDING FABRICS.

Description

248 1328

  Process for making an article of creped wadded fabric

  One of the most important commercial developments in the field of fabric wadding manufacturing in recent years has been the heart drying technology that enables

  continuous web of wadded fabric more voluminous and more flexible.

  The continuous webs dried at the heart are not pressed between pressure rollers to remove the water, but instead they are subjected to a flow of hot air which dries the continuous web of wadded fabric by a sweating effect instead.

  only by the action of a pressure. In addition,

  naked are usually not calendered, which provides a softer and more bulky product. Usually, continuous webs of wadded fabric of this kind are creped.

  to give them additional flexibility - and to

  to create certain links, realizing the paper, between

  cellulose fibers in order to increase the swelling

  and flexibility, but it has been found necessary to adhere the pre-dried fleece web to the Yankee drying cylinder, by means of adhesives, in order to achieve

  correct creping of the continuous web of wadded fabric.

  When spraying adhesives onto the Yankee dryer, the transfer fabric invariably absorbs a small amount of adhesive, either by direct contact with the

  Yankee dryer, either from impurities of the adhesive

  pension in the air. A significant amount of adhesives and other impurities are absorbed by the transfer fabric for a period of hours or days, while

  transfer canvas moves at a speed of 25.4 m / s. Juice-

  that nowadays it was difficult to clean the web of

  with the usual jets of steam or water, since this cloth had to immediately transport the continuous web of partially quenched cotton fabric from the drying cylinder to the core, and that a dirty transfer cloth would prevent transferring the continuous web of wadded fabric -2 from the transfer fabric to the Yankee dryer. A dirty transfer cloth also prevents flexibility and

  improved swelling of a continuous web dried to heart.

  A common industrial practice was to form a continuous web of wadded fabric on a forming fabric, then transfer it onto a carrier web, so as to drive the continuous web of wadded fabric around the core drying cylinder. The transfer between the forming fabric and the load-bearing fabric is usually carried out either

  by means of a drying cylinder at heart, equipped with

  These two means produce a considerable noise and consume a notable energy. The web of dried wadded fabric is traditionally transported between the carrier web and a transfer fabric to the Yankee dryer, whereupon a vacuum cylinder facilitates transfer from a position between the webs to the transfer fabric. web of wadded fabric is then attached by adhesion Yankee dryer. The tablecloth continues

  woven fabric should be attached to the Yankee dryer by means of

  sifs that are applied in close proximity to the transfer fabric. In one type of prior art core drying apparatus of the type disclosed in United States Patent No. 3,812,000, the web or

  continuous sheet of wrapped paper is drawn around the cy-

  Drying linden to heart on a drying cloth. The sheet is removed from the forming wire by a vacuum-assisted gripping roll or by a blade

  air. The sheet is sandwiched between the web of

  chage and a rotating cylinder after leaving the drying cylinder at heart. The patent filed in the United States of America under number 4,102,737 describes a machine for manufacturing the

  paper, in which the continuous sheet of paper is

  between a Fourdrinier type cloth and a drying cloth in a first drying zone, after which the continuous sheet is transferred onto the drying cloth,

  with the assistance of a blade of air, in order to be

  dragged through the drying device to the heart. The breed

  No. 3,300,576 discloses a core dryer in which the continuous sheet of wet paper is driven around a core drying cylinder between the surface of the roll and a core dryer. drying cloth. A flow of air is made from the inside of the drying cylinder to the core outwards,

  towards a closing cap, contrary to the con-

  reverse statements mentioned in patents cited above.

  The subject of the present invention is a

  assigned to manufacture an article of creped fleece fabric,

  it consists of: a) forming a continuous web of fabric

  cushioned by depositing a charge of cellular fibers

  lose, between a forming wire and a drip / transfer fabric, these webs circulating around a forming cylinder, creating between them a forming zone; b) removing water from the fiber load by compressing this load between the forming wire and the drip / transfer fabric; c) driving the continuous web of wadded fabric onto the drip / transfer cloth to a first cylindrical drying device; d) sandwiching the continuous web of wadded fabric between the drip / transfer fabric and a carrier web and driving the continuous web of wadded fabric around the first cylindrical drying device between said webs; and e) transferring the continuous web of wadded fabric from the drip / transfer fabric to a second

  cylindrical drying device and to crimp the tablecloth

  of the wadded fabric by separating it from the second

  drying by means of a crepe squeegee.

  -4- Other features and advantages of

  The invention will emerge from the description which follows,

  As non-limiting examples, and with reference to the accompanying drawings in which - FIG. 1 is a simplified diagram of a machine of the prior art for core drying and two-wire forming; FIG. 2 is a schematic diagram of a two-wire core drying and forming machine embodying the present invention; FIG. 3 is a partial schematic diagram of a paper making machine of the Fourdrinier type,

  used in connection with the present invention.

  In the present invention, there is described a method for manufacturing a creped wadded fabric article, wherein a continuous web of wadded fabric is formed by depositing the filler consisting mainly of cellulose fibers on a Fourdrinier type wire cloth apparatus, either in a two-wire camera. The continuous web thus formed is

  driven on a drip / transfer cloth to the point where

  placement of a first cylindrical drying device, following which the continuous web is sandwiched between

  the drip and transfer cloth and a load-bearing canvas.

  The continuous web of wadded fabric is entrained between

  around the first drying device, with a cover

  hot air directed through the drip / transfer cloth, the load-bearing fabric and the continuous web of cloth

  wadded from a hood which partially encloses the first

  drying device. The continuous web of wadded fabric

  hitherto predesigned is transferred from the sewer-

  transfer / transfer to a second drying device,

  killed in the form of a Yankee dryer, and is then creped, from this dryer, by means of a crepe squeegee. Adhesives can be used to ensure adherence of the

  continuous tablecloth of fabric wadded Yankee dryer.

  The continuous web of wadded fabric can be

  driven from the forming zone to the first

  drying on the drip / transfer cloth so that no transfer of the web continues, from a canvas to another canvas, is necessary. The continuous web can be driven around the first drying device

  with the drip / transfer cloth or with the canvas

  close to the first drying device.

  The drip / transfer cloth may be continuously cleaned by any suitable method employed between the second drying device and the

forming area.

  It appears that the present invention will be better understood by first describing a typical apparatus of the prior art. As shown in FIG. 1 (on which is mentioned "prior art"), there is shown a papermaking machine of the type comprising a core drying. The paper feed is fed from a head 10 to a two-wire forming apparatus comprising a forming fabric or fabric 12, a drip fabric 14 and a forming roll 16. The feed sent by the head 10 is pressed between the canvases 12 and 14 around the cylinder 16

  such that a significant percentage of the water contained

  in the fiber load is eliminated during this initial phase. Otherwise, the load can be spread on the Fourdrinier type canvas and the water is removed by boxes

  empty or by chainlines. The web continues 18 thus forming

  mée is transported on the fabric 14 to the carrier web which causes the continuous web around a core drying cylinder 22 whose action is assisted by the creation of a vacuum, to the transfer fabric 23 following which the continuous web is sandwiched between the transfer fabric 23 and the carrier web 20. A vacuum cylinder facilitates transfer to the transfer fabric 23. Since the continuous web has undergone prior drying

248M3E?

- 6

  important before reaching the Yankee dryer cylinder, it may be necessary to use creping adhesives delivered by a projection device 28, in order to

  adhere the continuous web 18 to the Yankee 24 Dryer.

  In the device shown, it arises

  a number of specific problems, the most important of which

  so much is the cleaning of the transfer cloth 23.

  Since the transfer fabric 23 captures a small amount of adhesive from the Yankee dryer or airborne adhesive particles, and seizes

  impurities suspended in the air and

  As a result of the fiber webs from the continuous web 18, it would be desirable to clean the web to remove the adhesive and any other impurities or soils as quickly as possible once the web is removed from the web 23. preferred-using water or steam under high pressure. However, since the fabric 23 will grab a relatively dry continuous web from the carrier fabric 20, this fabric 23 should be

  kept as dry as possible, which has traditionally

  prevented the continuous cleaning of the canvas with

some water.

  In addition, the dryer at heart 22, whose ac-

  tion is assisted by the creation of a vacuum and which is neces-

  to ensure effective transfer of the groundwater table from the drain screen 14 to the load-bearing

  , produces an important noise which is at least

  unstable and possibly dangerous.

  Fig. 2 describes the device used to

  the implementation of the method according to the present invention.

  A load intended for papermaking is delivered by a head 40 disposed between a dewatering / transfer fabric 42 and a forming fabric 44.

  forming fabric may consist of any number

  than fabrics or fabrics of the Fourdrinier type usual in the papermaking industry. A continuous web -7-

  wet paper is formed between webs 42 and 44 and

  edge, from the forming zone located between the webs 42 and 44, in the form of a continuous web 46 adhering to the web

  42. The drip / transfer fabric 42 and the fabric of

  mage 44 are driven around the forming cylinder 48 in

  being reciprocally compressed, so that an important part

  water contained in the feed sent by the head 40 is eliminated. Web 44 is returned to the forming roll on deflection rolls 52, 54, 56 and 50. This web 44 may be cleaned using devices well known in the art (not shown here) before contacting.

with the forming cylinder 48.

  The wet continuous web 46 is driven by the drip / transfer fabric 42 from the forming zone to a rotating cylinder 58, at which the fabric 42 is positioned between the continuous web 46 and the web 46.

  58. The continuous web 46 is driven around the cy-

  core drying liner 64 made of a cellular material

  open cell, below a feed hood

  66, the carrier web 60 being adjacent to the

  Drying line 64, as shown in FIG. 2.

  The continuous web 46 is dried by the high-speed hot air passage 67, coming from the hood 66 and which passes through the continuous web and enters the cylinder 64. Although this is not shown here, it enters the frame of the present invention that in place of the carrier fabric 60, the drip / transfer fabric 42 can be arranged at

  close to the core drying cylinder 64. The continuous

  naked 46 is sandwiched between the drip / transfer fabric 42 and the load-bearing fabric 60 from the cylinder

  58, and this at 62, on the periphery of the cylinder of se-

  chage à coeur 64 until the canvases separate in 68.

  The drip / transfer fabric 42 may be softer than the carrier fabric 60, so that the continuous web 46 adheres to the fabric 42 and is driven around the guide roller 74 on the fabric 42. Otherwise, the cylinder 74 can be equipped

  a vacuum device to facilitate the transfer.

8-

  Since the continuous web 46 is

  dragging from the forming zone and around the core drying cylinder 64, being disposed on the dewatering web

  transfer 42, there is no transfer of the web

  between the canvases, and therefore no assistance either from a mechanism creating a vacuum or from

  an air knife mechanism is not necessary. The water table continues

  The blank 46 is driven between webs 42 and 60 to a position just upstream of the Yankee dryer 72 and in which the web continues to adhere to the drip / transfer cloth and is driven around the guide roll 74.

  to reach the cylinder of the Yankee dryer 72. The fabric

  The machine 60 returns, by passing on the rollers 76, 78, 80 and 82, to the core drying cylinder 64 and can be cleaned by any well-known method of the type using, for example, water or high-pressure steam. . The tablecloth

  - 46 is brought into contact with the Yankee dryer 72 by a cy-

  pressing die 84, following which the continuous web 46 flows around the Yankee dryer 72, in order to be

  removed from the Yankee dryer, being creped, by the doctor blade 86.

  The continuous creped web 88 is then driven in order to

  storage or processing, by means of a roller

  neur 91 to form a roll 90. If necessary, a small amount of adhesive can be projected to the surface

  the Yankee 72 dryer, as for example in 92, in order to facilitate

  the adhesion of continuous web 46 to the Yankee 72 dryer.

  The drip / transfer cloth is brought back to the

  forming by means of return rollers 94, 96, 98 and 100.

  Since the drip / transfer fabric 42 will return to a wet forming zone, the cleaning

  canvas with a projection of water or steam does not

  The ability of the web to grip and transport a partially dried web of fabric, as in the case of the prior art, will not be impaired. Therefore, a stream of water or vapor 102 may be disposed at any convenient location between the

248 1? 2

  9- Yankee 72 dryer and 100 roll, before the adhesives,

  which can be seized by the fabric 42, have been able to dry.

  Another embodiment of the present invention

  The invention could be used in a forming device of the type shown in FIG. 3. In this embodiment, the charge is sent by a head 104 to a Eurdrinier fabric 106 and is subjected to dehydration, for example by means of an aspiration carried out by a vacuum device 109 located in the forming cylinder 108 and in the rotating cylinder

  112, by vacuum boxes 110 or by bridges

  113. The continuous web 114 is spaced from the web 106 at the interstice between the web 106 and the web

  drip / transfer 116, when the latter is wound.

  around the seizing roll 118. Then the continuous web is sandwiched between the drip / transfer cloth

  and a carrier web, as in FIG. 2. The canvas of

  mage 106 returns to the forming cylinder 108 by flowing on return rollers 120 and 122, and can be cleaned using any conventional method, after the web continues

114 was crushed.

  It will be understood that the embodiment of the present invention, here illustrated and described, must be

  considered to be a preferred embodiment. Other modalities

  will be obvious to those skilled in the art without

  for that, depart from the scope of the present invention.

248 4,328

- 10 -

Claims (1)

CLAIMS) A method for manufacturing an article of creped wadded fabric, characterized in that it consists of a) forming a continuous web (46, 114) of wadded fabric by means of a deposit of a load of cellulosic fibers. between a forming wire (44, 106) and a dewatering / transfer cloth (42, 116), these cloths circulating around a forming roll (48, 108), creating between them a forming; b) removing the water from the fiber load (46, 114) by compressing this load between the forming wire (44, 106) and the dewatering / transfer cloth (42, 116); c) driving the continuous web of wadded fabric (46, 114) onto the drip / transfer web (42, 116) to a first cylindrical drying device; d) sandwiching the continuous web of wadded fabric (46,114) between the drip / transfer fabric (42,116) and a carrier fabric (60) and driving the continuous web of wadded fabric ( 46, 114) around the first cylindrical drying device (64) between said webs (42, 60; 116, 60); and e) transferring the continuous web of wadded fabric (46,114) from the drip / transfer web (42,116) to a second cylindrical drying device (72) and creping the continuous web of wadded fabric ( 46, 114) by separating it from the second drying device (72) by means of a creping belt (86). The method according to claim 1, further comprising conveying around the first drying device (64) the continuous web of wadded fabric (46, 114) with the carrier web (60) disposed between the continuous web of wadded fabric (46, 114) and the device 248 123 - 11 -   for drying (64) and with the drip / transfer fabric (42, 116) covering the continuous web of wadded fabric (46, 114) on   the face of the latter opposite to the carrier web (60).   3) - A method according to claim 2, characterized in that it consists, moreover, to transport around the first drying device (64) the continuous web of wadded fabric (46, 114) with the drip / fabric transfer disposed between the continuous web of wadded fabric and the first drying device, and with the carrier web covering the continuous web of wadded fabric on the face of the latter opposite to the load-bearing web.   A method according to claim 1, further comprising conveying the continuous web of wadded fabric (46, 114) from the forming zone and around the first drying device (64) on the drip / transfer line (42, 116), so that the first drying device (64) is not provided with means for vacuum production. -   ) Method according to claim 4, characterized in that it consists, moreover, in adhering the   continuous web of wadded fabric (46, 114) on the second   drying (72) with adhesives (92) applied to the second drying device (72) or the continuous web of wadded fabric (46, 114).   60) - Process according to claim 5,   characterized in that it further comprises cleaning   drip / transfer cloth (42, 116) with jets of water or steam (102) arranged between the   drying and forming cylinder (48, 108).   7) - Process according to claim 5,   characterized in that it further comprises cleaning   tinu the drip / transfer cloth (42, 116) with air jets disposed between the drying means and the cylinder forming (48, 108).   12 -) - Method according to claim 1, characterized in that the continuous web of wadded tissue (46, 114) has an initial dry weight of between about g / m2 and 51 g / m2.   9) - A method for manufacturing an article of creped tissue, characterized in that it consists of: a) forming a continuous web (46, 114) consisting mainly of cellulose fibers by means of a deposit of a charge fibers on a forming wire (44, 106);   b) removing water from the continuous web (46, 114) in a forming zone composed of a forming fabric and a drip / transfer fabric (42, 116),   the water of said web continues being discharged by application   a vacuum to this web or by compression thereof.   c) sandwiching the continuous web (46, 114), the water of which is partially separated between the drip / transfer fabric (42, 116) and a carrier web (60), and conveying the web ( 46, -114) between said   webs (42, 60, 116, 60) through a first zone of se-   chage (64); d) drying the continuous web (46; 114) in this first drying zone (64) by forcing hot air through the drip / transfer fabric (42, 116), the web continues ( 46, 114) and the carrier web (60); and e) transferring the continuous web (46,114) from the drip / transfer web (42,116) to a second drying zone (72) in the form of a drying cylinder and creping the continuous web (46, 114) by separating it from the drying cylinder (72) by means of a crepe squeegee (8E). - 13 - 2481328    A method according to claim 9, characterized in that it further comprises forming the continuous web between the drip / transfer fabric (42, 116) and a forming fabric (44, 106) when these fabrics are transported around a forming cylinder (48) in such a way that the water is removed from the continuous web (46, 114) by compression of the webs against the cylinder of forming (48).   11) - Method according to claim 9, characterized in that it consists, in addition, to transport the   web (46, 114) through the first zone of se-   chage (64) between the webs without separating the web   tinue (46, 114) of the drip / transfer cloth (42, .116)   by the use of a vacuum or a jet of air at high pressure. if we.   12) - Process according to claim 11, characterized in that it comprises, in addition, a separation of   the drip / transfer fabric (42, 116) of the fabric   (60) upstream of the second drying zone (72), and transporting the continuous web (46,114) to the second drying zone (72) on the drip / transfer cloth (42, 116).   13) - A method according to claim 12, characterized in that it further consists in adhering the continuous web (46, 114) on the drying cylinder (72) by means of creping adhesives which are applied au'cylindre   drying (72) or continuous web (46, 114).   14) - Process according to claim 12,   characterized in that it further comprises cleaning   drip / transfer cloth (42, 116) with jets of water or steam (102), arranged between the cylinder of   drying (72) and the forming roll (48).