FR2641457A1 - PROCESS AND DEVICE FOR PRODUCING TUBULAR MATTRESS CANVAS - Google Patents

Abstract

The invention relates to a method of preparing ribbed mattress fabrics comprising a textile top sheet and a textile bottom sheet and partition wall strips. According to the invention, lengths 1 of the folded strips forming partition walls with outer edges covered with a binding material 5, 6 are provided with a barrier 8 placed between them and capable of preventing the molten binding material from s' flow, the strip-like barrier being placed in a desired pattern between the top and bottom sheets before these are simultaneously heated from both sides. The invention applies in particular to mattress fabrics to be filled with feathers or down.

Description

The present invention relates to a process for the preparation of

  ribbed mattress comprising a textile top sheet and a textile bottom sheet which are connected at their edges, and partition walls which at their longitudinal edges are welded to the top sheet and the bottom sheet respectively for forming sheaths in the mattress fabric, in which partition walls folded about a longitudinal axis and covered at their outer sides, along their longitudinal edges, with a thermosensitive bonding material are introduced between the top and bottom sheets and the bonding material is heated to melt and after cooling, it connects the partition wall to the top sheet and the bottom sheet, respectively, and then, if necessary, is cut at appropriate lengths to connect them along

their edges.

  A known method of the type mentioned above

  is described in the patent descriptions in Denmark

Nos. 132,517 and 134,384.

  In this known method, two webs of a textile material are used as top and bottom sheets and said webs are transported at the same time while parallel and coherent webs of partition walls are introduced between the two webs into one web. number corresponding to the desired number of sheaths in the finished mattress fabric. Then, the product of the webs thus formed is heated in the areas corresponding to the strips of the introduced partition walls and after cooling, the product formed is cut to appropriate lengths. Finally, the two sheets of textile material are connected along

  their edges, for example by sewing them.

  During the practical production of rib mattresses according to the method described, it became apparent that the melted thermoplastic binding material penetrated into the strips of the partition walls so the overlapping portions of the strips were not only glued to the sheets of textile material but

also together.

  As a result, it has become necessary to use unbonded partition wall strips and to place thermoplastic bonding material coatings at each side edge and opposite sides of each strip. This means that the upper and lower layers of textile material must be placed laterally offset until the topsheet and the sheet of the

  below are sewn to each other.

  The known method is also not usable for the production of partition walls, which extend obliquely to or both longitudinally and transversely to the direction of the machine, it is impossible to obtain a set up scuhaitée separation walls and consequently a desired erection of the insulating material, for example in the form of down and / or

  feathers, to be introduced in the rib mattress cloth.

  These disadvantages are eliminated by the method according to the invention, which is characterized in that the lengths of the folded strips forming the separating walls with outer edge areas covered with a connecting material are provided with a web-shaped barrier. placed between them and adapted to prevent the molten bonding material from the two zones from flowing, said strip-shaped barrier being placed in a desired pattern between the top and bottom sheets before they

  were simultaneously heated on both sides.

  By using, instead of coherent strips forming separation walls, lengths of

  these and simultaneously heating the whole of.

  On the surface, it becomes possible to place, at any desired level, the folded strips forming partition walls. This is preferably done by stepwise driving a lower length of textile material to a light table having the desired pattern of placement and placing, by hand, the lengths of the partition wall strips according to FIG. and then, placing an upper length of the textile material on the lower length before the two lengths are entrained through a heater capable of heating the seal in an area extending from an edge

lateral seal to the other.

  The tape web barrier between the two overlapping portions of the partition webs effectively prevents them from melting and fusing, and it is therefore possible to sew the edges of the textile lengths without the need to move one relative to the other. An example of a suitable barrier material is cotton, preferably in the form of two ribbons which are placed on the inner side of the folded partition wall in each edge zone coated with the binder. For binders activated at a relatively low temperature, "Teflon" or a corresponding material may also be used, preferably in the form of film strips which are connected to one of the cover portions of the partition wall strip. and that prevent the

  penetration of the molten bonding material.

  It is particularly convenient to secure the tapes forming the strip-like barrier to the strips of the heat-fixing wall by points. Furthermore, the invention relates to a device for carrying out the method described above. This device is characterized in that it comprises means for transporting a web of a textile material on which the partition wall strips are placed as described above in a desired diagram, ur. means for placing a second ply of textile material on the first, and means for heating all the portions of the joint of the textile plies and partition wall strips which

are between them.

  The invention will be better understood, and other purposes, features, details and advantages thereof will become more apparent in the course of

  explanatory description which will follow made in

  reference to the accompanying schematic drawings given solely by way of example illustrating several embodiments of the invention, and in which: - Figure 1 shows a perspective view of a partition wall strip for use in the process according to the invention; 'invention; - Figure 2 is a sectional view of the folded strip forming partition wall according to Figure 1; FIGS. 3 to 5 show three different layouts for the lengths of the partition wall strips to be used in the method according to the invention; FIGS. 6 and 7 show respectively a perspective view and a sectional view of a second embodiment of a partition wall strip to be used in the method according to the invention; FIG. 8 is a schematic side view of a device for carrying out the method

2 6 4 1457

  according to the invention; FIG. 9 is a diagrammatic plan view of the device according to FIG. 6; and FIG. 10 is a detailed view of clamping members forming part of the device

shown in Figures 8 and 9.

  Figures 1 and 2 show a band 1 forming a partition wall which is folded around its longitudinal axis 2 to form a half 3

covering another half 4.

  At their outer sides along a border zone, the halves 3 and 4 are covered with a thermally activated bonding material in the form of

  film strips 5 and 6 in a thermoplastic material.

  The film strips come out attached to parts 3 and 4 of the

  partition wall at points 7.

  In the embodiment according to FIGS. 1 and 2, a tape fencing placed between the halves 3 and 4 is composed of two cotcn ribbons 8 ensuring that the strip can receive sufficient heat on both sides to activate the binding material (the film strips 5 and 6) to thereby secure the partition wall to the top and bottom sheets, without the heat of one of these heating systems extending to the other to a point where the melted product of one edge zone enters the other zone and links the two halves 3 and 4 of the

partition wall.

  In the embodiment according to Figures 6 and 7, the barrier between the two halves 3 and 4 of the partition wall consists of a ribbon 8 'of a material, such as "Teflor.n", which prevents a melt formed by heating the film webs 5 and 6 and entering the adjacent web port, to contact the opposite portion. The band 8 'is preferably attached to a band portion by spot scribing. This barrier, possibly in the form of two ribbons 8 ', is applicable if the bonding material is activated at a relatively low temperature or if the material of the partition wall is unlikely to be penetrated by the bonding material. FIGS. 3 to 5 show preferred diagrams for placing folded strip portions

  1 on a web 9 of a textile material.

  The device shown in FIGS. 8 and 9 consists of a mounting table 20 and a screed table 21. The mounting table 20 comprises a number of beam-like elements 22 (see FIG. 8) which are placed at a short distance from each other and which are supported by a support 23. At the left end, the mounting table 20 has the frieze of a light table 24 constructed so that dcneed patterns can appear at the top of this table. At a short distance above the beams 22 there is provided a support plate 25 for a web of textile material. A group of organs

  clamping device 26 is placed under the support plate 25.

  As shown in FIG. 10, the clamping members 25 comprise a frame 30 which is connected to a carrier plate 31 reciprocating on guides 32 mounted on beams 33 which are placed on both sides of the mounting table 20. The movement of the piercing plate 31 is controlled by a V-shaped belt driven by a pulley 35 which is connected to a motor, not shown. At the lower beam 36 of the frame, in the spaces between the beam-shaped members, bar-shaped stoppers 37 are provided which cooperate with locking means 38 placed on the upper beam 39 of the frame 30 so as to to be automatically moved in the vertical direction by means of moving

not represented.

  Above the support plate 25 are provided tabs 40 on the sides of the table, said tabs being connected to each other by a cross member 41 to which is attached a pivoting arm 42 which carries a device 43 cutting predetermined lengths of a partition-shaped strip introduced into the device 43 from a roll 44 and passing over

rolls 45.

  The welding table 21 is composed of a table top 50 which is placed on the support 51. In the table top 50 is mounted a plate-shaped heating element 52 which extends across the tabletop. 50. A heating pad 53, movable in the vertical direction and extending over the width of the table 5C, is mounted above the heating element 52 with an extractor screen 54 comprising a suction tube 55, the screen and the tube being connected to a device

suction, ncn shown.

  In the immediate vicinity of the table top 50 scnt mounted clamping members 56 which are adapted to clamp and hold two plies of a textile material which are on top of one another, and to transport step by step said webs to the end

opposite of the welding table 21.

  The operating mode of the device will be

described in the following.

  The edges of a web 60 of a textile material, which is placed on the support plate 25, and another web 61 of textile material, part of which is above the light table 24 and whose opposite end is suspended along the end of the mounting table 2C, are introduced into the area between the stop devices 37 and the movable locking means 38 which are then forced to

  keep the textile tablecloths firmly between them.

  The partition walls are now placed according to the diagram shown on the table

bright 24.

  The clamping members 26 are then transported one step to the opposite end of the mounting table 20 and then a new section of the textile web 61 is driven onto the table.

bright 24.

  Other partition wall strips are now placed on the textile web 61 and the textile webs 60 and 61 are transported to another stage. These operations are repeated until the partitioning strips are placed over the entire surface of the textile web 61 and the

  textile web 61 has been covered with the web 60.

  Then, the clamping members 62 are released and moved back a short distance. Then, again, they are forced to firmly hold the textile webs together, and said webs are transported until their leading edge scit is introduced into the clamping members 56 which are forced to clamp the material. Then, the clamping members 26 are driven back to their

starting position.

  The stepwise conveyance of the two textile webs is then effected by means of the clamping members 56 which, between each transport step, produces welding of the separating parison strips to the two textile webs 60 and 61 by means of heating shoe 53 which is lowered and forced to press the textile plies 60 and 61 to one another in the zone between the heating element 53 and the heating pad 53. When all the parts of the two textile plies have been heated as described, the clamping members 56 are transferred to their starting position and the edges of the two textile plies 60 and 61 are sewn.

R E V E N D I CAT I 0 N S

  A method of producing rib mattresses comprising a textile top sheet and a textile bottom sheet which are connected at their edges, and partition walls. which are welded at their longitudinal edges to the top sheet and the bottom sheet, respectively, to form sheaths in the mattress fabric, of the type of separating parcels folded around a longitudinal axis and covered at their external faces the

  along their longitudinal edges of a thermo-

  bonding material, are introduced between the top and bottom sheets, and the bonding material is heated to melt and after cooling connects the partition wall to the top sheet and the bottom sheet, respectively, and then, if necessary, they are cut to appropriate lengths and onr. connects them along their edges, characterized in that lengths of the folded partition walls with outer edge areas covered by the connecting material are provided with a band-shaped barrier which is placed between them and adapted to preventing the molten bonding material from the two zones from flowing, said barrier being placed in a desired pattern between the top and bottom sheets before they are simultaneously heated.

on both sides.

  A method according to claim 1, characterized in that the textile bottom sheet is transported on a light table which has the desired pattern in which the partition wall strips are placed and then the fabric sheet is placed on the bottom sheet and the partition wall strips and the two sheets are entrained through a heating device capable of heating an area extending from one

  side edge of the mattress to the other.

  3. Process according to any one of the

  preceding claims characterized in that the

  Strip-shaped barrier consists of two cotton ribbons or similar thermo-insulating material, guaranteeing that the joint between the partition walls and the top sheet and the bottom sheet respectively will be obtained in two zones

separate heating.

  4. Process according to any one of

  claims 1 or 2 characterized in that the barrier

  band-shaped consists of one or two ribbons'

  impervious to the bonding material, as in "Teflor".

  5. Process Selcnr. any of

  preceding claims, characterized in that the

  ribbons forming the strip-shaped barrier attached to the separation-forming strips by

thermofixing by points.

  6. Process according to any one of

  preceding claims, characterized in that the

  bonding material consists of two strips of thermoplastic film which are attached to the outer sides of the folded partition wall strip, by

spot welding.

  7. Arrangement for the implementation of the

  method according to any one of the claims

  preceding, characterized in that it comprises members (26, 56) carrying a web (61) of textile material on which arranged strips (1) form separating parcel selcn a desired pattern, organs (26, 56) for placing another web (60) of textile material on said first web (61) of textile material and means (52, 53) for heating all web-edge portions of textile webs and webs forming separation walls

between them.