FR2680497A1 - METHOD AND MACHINE FOR COVERING A SUBSTRATE. - Google Patents

Abstract

A method of covering an elongated element with an enveloping covering formed from a single sheet of deformable material, the elongated element having a re-entrant section profile delimited by at least one shoulder having a wall facing inward and a wall facing inwardly. 'exterior, this method comprising coating the surfaces of the elongate member to be coated with a contact adhesive, coating one side of said sheet with contact adhesive, presenting the sheet on the elongated member so as to adhere the sheet to the elongated member, with a marginal portion of the sheet covering a shoulder on the elongated member to be wrapped, folding the marginal portion so that it contacts with the wall facing inward, while protecting the rest of the marginal portion to prevent it from coming into contact with the outward facing wall, then allowing the rest of the folded marginal portion to enter. contact with the wall directed outwards to form, thereby a continuous coating of said shoulder by said envelope.

Description

j-

  METHOD AND MACHINE FOR COVERING A SUBSTRATE

  The present invention relates to a method and a machine for applying a sheet of deformable material to elongate elements having a cross section to achieve continuous covering of these elements, in particular when the elongate element is under the shape of a profiled element of a frame, such as a door jamb

or a mullion.

  An object of the invention is to provide the covering of an elongated element, for example a frame element intended to be used to construct a door frame, by means of a continuous wrapping The continuous winding around a profile with a non-reentrant section, such as a rectangular profile, is well known in the prior art However, the continuous winding in a reentering shoulder section

  is a much more difficult problem, especially when

  that contact adhesive is used, since the covering material must closely follow the contour

  of the re-entrant part of the elongated element.

  According to one aspect of the present invention, it provides a method for covering an elongated element with an enveloping coating formed from a single sheet of material

  deformable, the elongated element having a section profile

  trante bounded by at least one shoulder having a wall

  facing inward and a wall facing out-

  eur, this method comprising the fact of coating the surfaces of the elongate element, intended to be covered, with a contact adhesive, to coat one side of said sheet with contact adhesive, to present the sheet on the elongated member so as to adhere the sheet to the elongated member, with a marginal part of the sheet covering a shoulder on the elongated member intended to be wrapped, to fold the marginal part so that it makes contact with the directed wall inward, while protecting the rest of the marginal portion to prevent it from coming into contact with the wall facing outward, and then allowing the rest of the folded marginal portion to come into contact with the wall facing outward, thereby forming a continuous covering of said

  shoulder by said wrap.

  Preferably, the folding of the marginal part is carried out by advancing the elongate element longitudinally, with the sheet part glued to this element, along and beyond a folding means acting on the marginal part by exerting a directed pressure. towards the inside of the elongated element, the resistance to said pressure being

  obtained by guiding the elongated element on a rail-forming means engages

  ant in one or more longitudinal grooves

in the elongated element.

  According to another aspect of the invention, it pre-

  sees an apparatus comprising a folding station in the

  which the marginal part of the enveloping sheet is

  folded to cover said shoulder, means transported

  tor for transporting the elongate member longitudinally, in the folding section and beyond, and a guide rail means extending along the conveyor means and adapted to engage in the elongate member to guide its movement during its passage along the bending means, and to carry out a reaction against the forces directed inward

  acting on the elongated element.

  According to yet another aspect of the invention, the latter provides an elongated element having a re-entrant profile delimited by at least one shoulder having a wall directed inwards and a wall directed outwards, a

  wrap formed from a single sheet of material

  formable bonded with contact adhesive on the

  said walls to achieve continuous overlap for said shoulder. The sheet material may be in the form of a plastic sheet material, such as chloride

  polyvinyl, laminated material or veneer.

  Embodiments of the invention will often

  holding be described by way of examples, with reference to the appended drawings, in which: Figure 1 is a schematic perspective view of the apparatus according to an embodiment of the present invention; Figures 2 to 7 are schematic illustrations showing a sequence of operations for

  cover an elongated element according to the pre-

invention.

  With particular reference to Figure 1, an apparatus for making the wrapping, generally designated 1, has a pair of parallel conveyors 2 and

  horizontal, spaced from each other, with a horizontal rail-

  stationary tal 3 arranged between them The regions adjacent to the opposite end portions of the conveyors 2 have been

  designated A and B, as shown in Figure 1.

  The arrangement of the apparatus in the longitudinal direction of the conveyors 2 will be described starting from the upstream end part A, to go towards the opposite downstream end part B The direction going from upstream A to downstream B will be -after designated direction D, as indicated on the

Figure 1.

  A first set of horizontal pressure rollers 5 is generally disposed above the rail 3, in the upstream end portion A of the machine 1 A first heating element 7 is positioned adjacent to the pressure roller, substantially at the same height as the rollers 5 A folding station, generally designated 9, is located downstream, in position adjacent to the first heating element 7 The folding station 9 comprises a first folding guide 11 having a static folding face, preferably in the form of a rod Le first folding guide 11 extends in direction D, its upstream end being higher than its opposite downstream end The folding station 9 comprises

  also a horizontal protection plate 13 which is

  placed below the first folding guide 11 The plate

  protection 13 may be made of stainless steel.

  A second set of pressure rollers 15, 16 and 17, one of which, the roller 15 is vertical, while the roller 17 is horizontal and the roller 16 is inclined, are placed adjacent to the folding station 9, the roller 16 is preferably located immediately downstream of the downstream end of the folding guide 11 A second element

  heater 19, a second folding guide 21, oriented in

  era similar to the first guide, and a third set of vertical pressure rollers 23 are further arranged along the conveyors 2 A fourth set of horizontal pressure rollers 25 is further disposed along the length of the conveyors 2, in position adjacent to the downstream end portion B. During work, the machine 1 receives a frame element, such as a door jamb 30 having a re-entrant section, for example the L-shaped section shown in the drawings, this element having, on its face lower one

  longitudinal groove 31 intended to cooperate with the rail 3.

  The engagement with the rail 3 allows the door jamb to be driven longitudinally, but resisting lateral movement caused by the pressure of the rollers on the side of the jamb The exterior surfaces of the door jamb are coated with contact adhesive dry The core of the door jamb 30 may, if necessary, be made of synthetic sheet material, such as a medium density fiberboard, but it may also be made of wood.

  massive To facilitate the description of the operation

  of machine 1, 30 a has been designated the highest face (the face at the top of the dorsal branch of the L-profile), 30 b the face directed inward, descending from the highest face 30 a , and 30 c the face directed outwards away from its junction with the face 30 b directed inwards, while said junction between the faces directed inwards and outwards respectively is designated 30 d, as shown in Figures 2 to 6, and in addition, the term "shoulder" will be used to denote the

  surface that together form the face 30 b facing inward

  the junction 30 d and the face 30 c directed towards the ex-

  The machine 1 also receives a sheet material 32 which has been treated similarly with a dry contact adhesive. For a door jamb, PVC is a material chosen preferably for the sheet material 32, because of its properties. self-extinguishing in the event of fire The contact adhesive, on the door jamb 30 as well as on the sheet 32, is chosen such that the initial bonding between the two occurs when they come into contact for the first time,

  the bonding ends with the application of pressure.

  In practice, a sheet 32 is presented on the door jamb 30 so as to adhere part of the sheet 32 to the uppermost face of the door jamb 30, leaving a marginal part 33 of the sheet situated above the shoulder of the door jamb 30, as shown in Figure 2 The jamb 30 and the sheet 32 are then presented on the upstream end A of the machine so that the groove 31 engages the rail 3 The arrangement of the first set of rollers 5 above the conveyors 2 is such that the upright 30 and the sheet 32 are clamped between the conveyors 2 and the pressure rollers 5, and therefore the movement of the conveyors in the direction D causes the upright 30 along

  of rail 3 The pressure exerted by the first set of wheels

  leaux 5 also serves to complete the bonding of the sheet 32 on the part 30 at the highest of the door jamb 30,

as shown in Figure 2.

  As the upright 30 is driven by the conveyors 2 in the direction D, it passes under a first heating element 7 which serves to heat the sheet 32 to

  a temperature sufficient to soften the plas-

  tick so that it is ready to be folded The upright 30 then reaches the folding station 9 The action of the folding station is shown more particularly on

Figures 3 and 4.

  When part of the sheet 32 and the upright 30 enters the zone of the folding station 9, the first folding guide 11 which has a static folding face having a radius of curvature smaller than that of the junction 30 d of the upright door 30, deflects a marginal part 33 of the sheet 32 towards the face 30 b of the upright, which is directed inward The initiation of the bonding between the sheet 32 and the face 30 c, directed outwards, of the upright 30, is prevented by the presence of the protective plate, on the surface of which the sheet 32 can

  sliding without adhering The reaction between the pro-

  tection 13 and the face 30 b directed inwards serves to positively control the folding and provides a tight fold around the edge 50, and a progressive contact between the surface of the sheet 32 and that of the door jamb, from the edge 50 to the bottom of the fillet forming the junction d The downstream end of the guide is positioned at very short distance from the junction 30 d, so that the sheet 32 is, when it leaves the guide, pressed into

the junction 30 d.

  The downstream end of the folding guide 11 projects beyond the downstream edge of the protective plate 13 to allow this guide 11 to press the sheet into the junction In the region immediately downstream of the downstream edge of the plate 13, the rest of the marginal part 33 of the sheet 32 is no longer supported, and it is also pressed by the guide 11 which applies it to the surface 30 c The oblique roller 16 (see Figure 5) is preferably located immediately in downstream of guide 11 to maintain pressure on the sheet

  32 so that it remains in contact with the junction.

  Thus, leaving the folding station 9, the sheet 32 has a shape which substantially matches the side b facing inward, as well as the junction 30 d, and the marginal portion 33 of the sheet 32 can now come into contact face 30 c facing outward, which initiates bonding thereon The sheet material is then kept in contact with the upright, while cooling takes place, and the bonding between the sheet 32 and the upright door 30 is completed by means of the second set of pressure rollers 15, 16 and 17, as shown in Figure 5, the roller 15 acting on the side 30 b facing inwards, the roller 16 acting on the junction 30 d

  and the roller 17 acting on the face 30 c directed towards the ex-

  The pressure rollers 15, 16 and 17 are able to exert a significant pressure on the upright 30, because the latter is kept in engagement with the pressure rollers by the cooperation of its groove 31 with the rail.

fixed 3.

  As the upright 30 is driven further by the conveyors 2 in the direction D, it arrives under a second heating element 19 which serves to soften the sheet for a second folding. Then, the upright meets a second folding guide 21 which acts similarly to the

  first folding guide 11 for folding the sheet 32 into the

  as for the side of the upright 30, as shown in Figure

  6 The bonding on the side of the upright 30 is then para-

  overlapped by a third set of pressure rollers 23, as shown in Figure 7 The upright 30 is extracted from the machine 1 by means of a fourth set of rollers 25 which act similarly to the pressure rollers 5 of the first set The relative position of the first set and of the fourth set of rollers, respectively the rollers 5 and, is such that during the passage of the upright in the machine, there is always at least part of the upright

  30 which is under either of these two sets of wheels

  leaux, which keeps the amount 30 resting on the carriers 2 and prevents it from sliding on them,

  so as to ensure its positive entrainment in the machine 1.

  The number of folding stations depends on the number of folding operations required. In the example shown,

  two folding stations have been planned, since

  face the possibility of executing the folding of the marginal portion 132 by turning over the upright 30 after it leaves the machine, and by introducing it again into the

  machine by what was previously its posterior end

  lower, and using the second folding section to fold the marginal portion 132 To do this, the side faces 60 of the profile must be at the same distance d from the rail. Consequently, it may be necessary to provide

  a second groove 31 for reversing the direction of introduction

tion of the amount.

  It will however be understood that a third folding station can be provided, if desired, for folding

of the marginal part 132.

  If the sheet material is capable of being folded without having to soften it beforehand by heating it, as, for example, in the case of veneer lumber, it is understood that it is then possible to do without heating elements. The machine described above makes it possible to coat a

  re-entrant shoulder having a junction 30 d of relative radius

  Preferably small, the covering sheet has a thickness of less than approximately 3 mm, preferably between 0.4 mm and 3 mm Preferably, the radius of curvature of the fillet

  of the junction 3 d is less than 12 mm, and it is, pre-

ference, about 6 mm.

  The radius of curvature of the guide 11, at least on its downstream end facing the junction 30 d and very

  close to this will be chosen with approximately 1 mm less than the radius of curvature of the junction 30 d.

Claims (1)

CLAIMS 1 Method for covering an elongated element with an enveloping covering formed from a single sheet of deformable material, the elongated element having a profile with an increasing section delimited by at least one shoulder having a wall directed inwards and a wall facing outwards, this process comprising coating the surfaces of the elongate element, intended to be coated, with contact adhesive, coating one face of said sheet with adhesive hesitant to contact, to present the sheet on the elongated element so as to make the sheet adhere to the elongated element, with a marginal part of the sheet covering a shoulder on the elongated element intended to be wrapped, to fold the marginal part so that it comes into contact with the wall directed inwards, while protecting the rest of the marginal part to prevent it from coming into contact with the directed wall ée outward, then allowing the rest of the folded marginal portion to come into contact with the wall facing outward to thereby form a continuous coating of said shoulder by said wrapping. 2 The method of claim 1, wherein the sheet material is formed of plastic. 3 The method of claim 2, wherein the marginal portion is heated before being folded, in order to make the plastic deformable. 4 Method according to claim 1, -in which the sheet material is wood veneer. Method according to any one of the preceding claims, in which the folding of the marginal part is carried out by advancing the elongate element longitudinally with the part of the sheet glued to this element, ll along and beyond a folding means. acting on the marginal part by exerting a pressure directed towards the inside of the elongate element, the resistance to said pressure being obtained by guiding the elongate element on the rail means engaging in one or more longitudinal grooves formed in the elongated element. 6 An apparatus for carrying out the method according to claim 1, comprising a folding station in which the marginal part of the sheet is folded to coat said shoulder, conveyor means for longitudinally transporting the elongated element in the section of folding and beyond, and means for guiding rail extending along the conveyor means and adapted to engage with the elongate member to guide its movement in the folding means and beyond and to provide a reaction against the forces directed inward on the elongated member. 7 Apparatus according to claim 6, wherein a first group of pressure rollers is located upstream of the folding means and a second group of pressure rollers is located downstream of the folding means for pressing the elongated element on the conveyor means to ensure that the elongate member is positively driven along and beyond the folding means. 8 Apparatus according to claim 6 or 7, wherein the elongate member has an upper face and a lower face and said shoulder extends from the upper face, said folding means comprising a static folding face which has an upstream end located above said upper face and a downstream end which is located below said upper face at a location adjacent to the junction between said walls of said shoulder, directed inwards and outwards. 9 Apparatus according to claim 8, wherein said junction is curved and said folding face is curved, the radius of curvature of said folding face being less than the radius of curvature of said junction. 10 Apparatus according to claim 8 or 9, wherein a pressure roller is located immediately downstream of said folding face, this pressure roller having a curved profile corresponding to said folding face and being arranged to exert pressure on said sheet in the region of said junction. 11 Apparatus according to any one of claims 8 to 10, wherein a protective means is located on said folding station to prevent the marginal part of said sheet from coming into contact with said wall of said shoulder, facing outwards , during the folding of the marginal part to come into contact with the wall directed inwards. 12 Apparatus according to claim 11, wherein the protective means comprises a plate spaced from the conveyor means, so that it is located between said wall facing outward and the marginal part of the sheet, this plate having a surface to which said contact adhesive does not adhere. 13 The apparatus of claim 12, wherein said plate is made of stainless steel. 14 Apparatus according to any one of claims 8 to 13 comprising heating means upstream of the folding means, these heating means being arranged to heat the marginal part before its introduction into the folding means. 15 Elongated element having a re-entrant profile delimited by at least one shoulder having a wall facing inwards and a wall facing outwards, an enveloping covering formed from a single sheet of deformable material bonded by means of a contact material to said walls to produce a continuous coating for said shoulder. 16 The elongate member according to claim 15, wherein said sheet of deformable material is a plastic. 17 The elongate member of claim 15, wherein said sheet of deformable material is veneer. 18 door frame constructed from one or more elongated elements according to one of claims 15 to 17. 19 door frame constructed from one or more elongated elements produced by the method of claims 1 to 5.