FR2529773A1 - WATERPROOF LINER - Google Patents

Abstract

1. A waterproofed covering sheet particularly intended to recover and protect the mattress of bedding for children and adults and for the incontinence, especially comprising a central tray (2) of tissue, partly waterproofed by a plasticized film (4), surrounded with an edge (3) having on its periphery elastic or at the very least retractable means, characterized in that the central tray (2) and the edges (3), making up the covering sheet, are in the form of a same piece of a non discontinue, extensible and mesh-provided tissue and that it includes a zone of stretched tissue, waterproofed on all or part of the surface intended to recover the upper face of the mattress, making up the waterproof zone, and a non stretched, extensible, non discontinue and permeable zone, at the periphery of the waterproof zone of tissue, making up the rest of the covering shett, and that it presents a homogeneity of the tissue on the periphery of the waterproof zone.

Description

The invention relates to a waterproofed fitted sheet, its method of

  manufacture to waterproof it and a device for the

implementation of said method.

  The invention will find its application particularly in the field of bedding and in particular for covering and protecting

  crib mattresses for children or adults and for incontinence.

  Currently, the fitted sheets have a central tray for covering the upper face of the mattress, this tray is surrounded by a rim that covers the edge of the mattress, this rim is provided on its periphery with an elastic to maintain the fitted sheet applied on the Cetype mattress cover can be made in one piece of fabric or possibly in several pieces of fabric that are

  then reported and sewn together.

  In the case of fitted sheets having a waterproof zone, they are currently always made of several pieces of fabric that are assembled by a seam In fact, the waterproof zone is made by applying a plastic film to a piece of fabric substantially similarly dimension, then the whole is sewn on a piece of complementary fabric to form the fitted sheet This provision is imposed by the manufacturing process of the waterproofing of the fitted sheet At present, the plastic film is deposited in strip

  on a piece of fabric, by calendering Which makes it possible to obtain a

  continuous manufacture of the waterproofing of a fabric Then,

  the roll of impermeable fabric obtained is cut into impermeable pieces

  They are sewn to make the fitted sheet.

  In the measure o during calendering, the width of the plastic film is less than that of the fabric, it is possible to obtain a certain homogeneity of the waterproofing in the transverse direction since there is no discontinuity between the two. sidebands

  of tissue and the central part which receives the laminated film.

  in the longitudinal direction, there will be a seam that will

  primera the homogeneity that had been obtained initially.

  Today's waterproof cover sheets suffer from discomfort

  between their impermeable zone and the rest of the fabric, due to the pre-

  In addition, the need to sew the impermeable zone leads to a high manufacturing time and cost. In addition, the presence of a seam makes them uncomfortable.

  sewing makes them particularly fragile at this level.

  The main purpose of the present invention is to provide an impervious fitted sheet which has a perfect homogenous of its fabric over the entire periphery of the waterproofed area The fitted sheet thus has no seam at this level which makes it particularly comfortable and resistant. Another object of the present invention is to provide a waterproofed fitted sheet, made in an extensible fabric, and which provides a substantial saving in its particular embodiment

  by a surface gain of the piece of fabric used for making.

  Another object of the present invention is to present a

  Manufactured to waterproof the fitted sheet by hot application of a plastic film by which the risk of bubble formation

  air when welding the film to the fabric are discarded.

  Other objects and advantages of the present invention appear

  during the following description, which is not, however,

  given as an indication and which is not intended to limit the invention.

  The waterproof fitted sheet, intended in particular to cover

  and protect a bed mattress or in the field of

  continence, including a central tray made of impregnable fabric

  laminated film surrounded by a rim

  elastic or at least retractable means is

  rised by the fact that it presents a homogeneity of the fabric on the periphery

of the waterproofed area.

  The manufacturing method for waterproofing a fitted sheet whose underside of this fitted sheet is intended to be applied on a bedding mattress is characterized in that a piece of cut plasticized film is applied to the dimensions of the desired impervious area. by hot pressing on the back of the fitted sheet in the area of the tray to be waterproofed and that simultaneously with the pressing, the air is evacuated

present in the fabric.

  The device for implementing the impermeable process

  The use of the fitted sheet is characterized in that it is in the form of a support shell on which is placed the fitted sheet a

waterproof stretched.

  The invention will be better understood if one refers to the description

  below, as well as to the attached drawings which form part of it

grante.

  Figure 1 shows a waterproof fitted sheet developed.

  FIG. 2 schematizes the device for the implementation

of the process according to the invention.

  Figure 3 shows a cross-section of the surface

  of the pressing support mattress in a preferred embodiment.

  FIG. 1 shows a waterproofed fitted sheet which has

  developed to observe the different parts of it.

  This fitted sheet 1 is made of fabric, this term to be taken in the broad sense and includes all the embodiments of textile surfaces such as in particular jersey, knit, The fitted sheet has a central plate 2 which is intended to cover the upper face of the mattress This flange 3 may be a piece of fabric attached to the central plate 2, but in general it will have a perfect continuity with this plate 2 being made in the same piece of fabric. flange 3 is intended for

  cover the songs of the bedding mattress, this rim 3 is lined externally

  by elastic means or at least retractable

  apply the fitted sheet on the mattress to be covered.

  The tray 2 will have a waterproof zone 4.

  According to the invention, this impervious zone 4 will have a perfect homogeneity with the whole of the plate 2, that is to say that it

  will not have any seams on its periphery.

  The impervious area will be composed of a plastic film applied

  To ensure perfect homogeneity, in a preferred embodiment, the piece of fabric on which the plasticized film is applied will be identical to the piece of fabric making up the rest of the tray 2. Thus, according to the invention, the tray 2 will be constituted by

  a single piece of fabric, the impervious area 4 being obtained by

  plication of a plasticized film on said piece of fabric.

  In this way, there is no discontinuity of the fabric on the

  periphery of the impervious zone 4.

  In the impregnated zone, the fabric which composes the plate 2 will preferably be in the stretched state. The plastic film which is welded to the fabric makes it possible to immobilize the fibers composing the fabric in a certain state. According to the invention, the film plastic will immobilize the texture of the fabric so that, for example, in the case of

  the knits are taut Due to its flexibility, the plastic film

  will, of course, allow folding of the sheet but on a small scale,

  plastic film will strain the fibers of the fabric.

  Preferably, the plastic film will cover an area of tissue in the stretched state. This stretching will not however be unduly exaggerated so as not to cause distension of the tissue. in addition it is necessary that the fabric still forms a structure for the plastic film. In this way, the impregnated zone which has a plastic film disposed on a stretched fabric makes it possible to save material at the level of the fabric surface used Since, in this case, the surface of the impregnated zone is made with stretched fabric and therefore larger than the piece of fabric originally unstretched.

  It is possible to perform a stretching according to the two dimensions

  plan or in one dimension.

  According to the method of manufacturing the waterproofing of the fitted sheet according to the invention, which consists in applying a plasticized film to fabric, the application of the plasticized film will preferably be carried out on the back of the fitted sheet. the side of the fitted sheet that will be applied against the bedding mattress Thus, the sheet

  cover will present a greater comfort since it will present-

  only a piece of fabric.

  Unlike current processes for manufacturing waterproof cover sheets, according to the method of the present invention, the piece

  laminated film will be applied to the fabric sheet already made.

  The piece of plasticized film will be cut to the dimensions of the imper-

  desired, then the plasticized film piece will be applied

  wise on the back of the fitted sheet in the area of the waterproof tray

  mégabiliser, which will allow a holding of the plasticized film on the fabric

by welding.

  At the same time as this hot pressing operation, the air present in the fabric will be evacuated. In this way, the risks of creating

  Bubbles at the weld of the plasticized film will be discarded.

  According to a preferred embodiment of the imperforate method,

  In accordance with the invention, the fabric comprising the fitted sheet will be tensioned, at least in the zone to be waterproofed, prior to the application of the plasticized film. In this way, and advantageously in the case of extensible fabrics, this will allow artificially increase the dimensions of the fitted sheet Indeed, the plasticized film will be applied - on a fabric-drawn surface and will immobilize the texture of the fabric in this position by welding which will allow a substantial gain by saving the fabric surface on which will be applied the piece

of plasticized film.

  It is obvious that the rest of the piece of fabric that has not received the application of the plasticized film will retract later The tensioning of the fabric should however be moderated so as not to distend it and in particular that the piece of fabric does not provide

  plus a support for the satisfactory plastic film.

  FIG. 2 schematizes a device for carrying out the process of the invention. It is more particularly a support mattress 5 on which the fitted sheet to be waterproofed will be threaded. This support mattress 5 has dimensions similar to those of the mattress.

  of bedding for which the fitted sheet is intended or preferably lower.

  However, the support mattress 5 will have properties

  particular, and in particular the possibility of expansion such as

  In this way, after having donned the fitted sheet on the support 5, it will be expanded which will result in placing the fitted sheet under tension. In the case of FIG. 2, it has been schematized expansion along two transverse plane directions,

  but it could have been considered expansion in one direction.

  Once the support mattress has expanded, it is possible

  to apply to the tray of the fitted sheet the plasticized film for imper-

  Mégabiliser its surface Because it is desired to place the plasticized film on the back of the fitted sheet, it will be necessary to place the fitted sheet

  upside down on the support mattress 5.

  The laminated film is applied to the fabric of the fitted sheet

  stretched, which provides the benefits outlined above.

  After application of the plasticized film and when it is cooled, the support mattress is again retracted and the fitted sheet

  When, for example, the entire surface of the tray has been imper-

  meabilisée, it follows that the waterproofed fitted sheet obtained is

  larger than the fitted sheet originally.

  According to a preferred embodiment of the support mattress according to the invention, the latter will have on its surface at least in the zone in contact with the zone of the waterproofed fitted sheet, means for absorbing or evacuating the air. pressing operation,

  the air contained in the fabric can be evacuated.

  6 - Figure 3 schematizes a preferred embodiment

  of these means According to the invention, the frame 7 of the support mattress pre-

  On the surface thereof, a cushion 8 made of cellular material will be seated. In this way, when the plastic film 9 is applied to the piece of fabric 10 by means of a heating press 11, the air present in the piece of fabric 10 can penetrate into the cellular material 8 and flow through the cells to the outside The foam material may advantageously be of course resistant to temperature foam. According to another embodiment of the device for implementing the method according to the invention for making a fitted sheet

  waterproofed, this device comprises a tubular frame

  sibly rectangular to the dimensions of a traditional bedding mattress

  We place the fitted sheet on the frame of the device For this, simply wrap the frame with the fitted sheet whose edge is folded around the frame while staying in this position using

  Peripheral elastic It should be noted that the fitted sheet being placed

  on a frame whose dimensions are substantially the same as

  those of a traditional bedding mattress, the fitted sheet is

  It will be placed on the frame in a stretched state.

  Then, all the sheet positioned on the frame, is placed flat on a cushion having the particular properties described above This cushion will preferably be made of a foam material such as foam Then, the plasticized film is available on

  the fitted sheet stretched over the frame where it is desired to

biliser this fitted sheet.

  Finally, it suffices to apply the heated plate of a press on the plasticized film in order to weld it on the fitted sheet which rests on the cushion. The cellular constitution of the cushion has made it possible, during the application of the press plate, to absorb the air contained in the fabric of the fitted sheet to prevent any bubbles forming

plastic film.

  Once welded, the hot platen of the press can be released and the fitted sheet can be removed from the frame, this sheet

cover is then waterproofed.

  In order to offer a counter-reaction to the pressure exerted by the plate of the press, it will be advantageous to have a cushion

  whose dimensions are at least greater than those of the plastic film

  7 - tick that must be fully covered by the heated tray of the

  press to be welded properly.

  Good results have been obtained by using as fabric a loop jersey which is extensible. It is possible to obtain, for example, a waterproof fitted sheet with a total width of 1.94 m starting from a piece of fabric with a width of 1.60 m from where a gain of 34 cm in width In this case, the plasticized film had a width

itself of 1.40 m.

  The plasticized film may be a PVC having a thickness of approximately 20/100 mm which will be applied at a temperature of between 100 and preferably 200 degrees of degrees of application. The application force of the plastic part will be limited. to 6 kg so that the plasticized film remains nevertheless superficial to the piece of cloth and does not penetrate it

not too deeply.

  Other implementations of the present invention, within the reach of those skilled in the art, could have been adopted without departing

of the frame of it.

Claims (7)

  1 waterproof fitted sheet, intended in particular for upholstering   to protect and protect bedding for children or adults and for incontinence, including a central fabric tray (2)   partially waterproofed by a plasticized film (4) surrounded by a   edge (3) having on the periphery elastic means or at all   less shrink, characterized by the fact that it has a homogeneous   born of the fabric on the periphery of the waterproofed zone (4).   2 waterproofed fitted sheet according to claim 1, characterized   terized by the fact that, in the waterproof zone (4), the fabric is found in a tense state.   3 waterproofed fitted sheet made of an extensible fabric according to claim 2, characterized in that in the zone   waterproofed (4), the fabric is in the stretched state.   4 Manufacturing method for waterproofing a fitted sheet according to claim 1, the back of the fitted sheet is intended to be applied on the mattress, characterized in that one applies a piece of plasticized film cut to the dimensions of the area desired waterproof, by hot pressing on the underside of the fitted sheet in the tray area   to waterproof and that the air present in the simulated tissue * while pressing.   Manufacturing method for waterproofing a fitted sheet according to claim 4, characterized in that the fabric constituting the fitted sheet is energized at least in the zone to be waterproofed.   prior to the application of the plasticized film.   6 Device for implementing the method according to the   dication 5, characterized in that it is in the form of an expandable support mattress (5) on which is placed the fitted sheet to be waterproofed. 7 Device for implementing the method according to   claim 5, characterized in that it is in the form of   me of a substantially rectangular frame on which the sheet is placed cover to waterproof tight.   8 Device according to claim 6 or 7, characterized in that the expansible support mattress (5) has on its surface, at least in the zone in contact with the zone of the waterproofed sheet,   means for absorbing or evacuating air.   Device according to claim 8, characterized by the fact that the means s? present in the form of a cushion placed in   surface of the support mattress, made of cellular material.   Device according to claim 9, characterized by the   that the cellular material is foam.