FR2488520A1 - PROCESS FOR MANUFACTURING FILTRATION PIPES AND FILTRATION PIPES OBTAINED - Google Patents

Abstract

THE FILTRATION PIPES ARE MADE FROM STRIP MATERIALS 2, 9 PREFERABLY MADE OF TEXTILE TABLECLOTH. IN THIS PROCESS, THESE MATERIALS ARE UNWINDED FROM RESERVE COILS 1, 8 AND ASSEMBLED IN A PIPE BY LONGITUDINAL LINKS GLUED BY OVERLAPPING, AND ARE THEN PROVIDED WITH TRANSVERSAL LINKS, THEN CUT EACH TIME THROUGH THE NEIGHBORHOOD OF THE NEIGHBORHOOD. PIPE IN THE SHAPE OF SACHETS. ON A LOWER BAND MORE WIDER 2 IS APPLIED AN ADHESIVE 7 IN THE FORM OF STRIPS SPACED AWAY FROM ONE ANOTHER FOR THE PURPOSE OF CONSTITUTING CROSS LINKS. THEN, A LESS WIDE TOP BAND 9 IS DEPOSITED ON THE LOWER BAND. ON THE TOP OF THE LONGITUDINAL EDGES OF THE UPPER BAND 9, CONTINUOUS STRIPS OF ADHESIVE 12 ARE DEPOSITED IN ORDER TO CONSTITUTE THE LONGITUDINAL BONDS 16. THE EDGES 4 OF THE LOWER BAND 2 WHICH EXCEED ARE FOLDED AND PRESSED BY THE BANDS OF THE PARETS. ADHESIVE 12 OF THE UPPER BAND 9. USE IN PARTICULAR FOR THE MAKING OF MILK FILTRATION PIPES.

Description

The invention relates to a method of manufacturing

  filtration pipes, in particular filter pipes,

  of milk, made from web materials preferably consisting of textile webs, in which these materials are unwound from stockpiles and assembled into a pipe by glued longitudinal links.

  overlay and are then provided with

  each of these transverse connections into sections of pipe having the shape

of sachets.

  Filtration pipes are known which are manufactured according to the so-called thermal welding process. In this process a strip-like material that unwinds from a reel

  reserve is folded so that the longitudinal edges

  folded parts are superimposed; by pressure and by heat supply the two superimposed parts are

  welded together along the longitudinal edges.

  The pipe thus formed by a longitudinal weld is

  then provided at specified intervals with trans-

  versales, again under the action of pressure and heat supply, and it is cut in the area of these welds

  transverse sections in the form of sachets.

  This method has the disadvantage that it is not possible

  sand only with materials that can be heat welded.

  Such a material is on the one hand very expensive and on the other hand

  a material having optimum properties for the filament

  This treatment is generally not likely to be hot-welded. Another serious disadvantage of this known process lies in the fact that the welding operation does not make it possible to obtain

  relatively low production speeds.

  To avoid these disadvantages, it has long been sought the possibility of replacing the weld by another mode of connection. The use of glue is not possible

  because the glue that is to be applied in order to

  The transverse connection would come into contact with the folding device, thus the folding device would be constantly clogged and it would be practically impossible to apply the glue in a clearly defined location. In the state of the art it has sometimes been considered the possibility of sewing the transverse connection. This sewing operation, apart from the inconvenience

  stitching is not waterproof, is relatively

  expensive, so that in general this process is not

more used.

  The object of the invention is to modify the manufacturing process

  cation of filtering pipes of the kind mentioned above so that different materials can be glued more quickly and cheaply into edible filtration pipes

longitudinal overlapping.

  According to the invention, this method is characterized in that on a wider lower band is applied an adhesive in the form of strips spaced apart from each other for the purpose of constituting the transverse links, then a smaller upper band is deposited

  on the lower band, than on the top of the long edges

  Tudinaux of the upper band, continuous strips of adhesive are deposited in order to constitute longitudinal connections and that the edges of the lower band which exceed are folded and pressed on the marginal parts

  coated with strips of adhesive from your upper band.

  The method according to the invention operates with two unwound strips of reserve coils. From a first spool is unwound first of all a wider band on which are applied at regular intervals adhesive strips intended to form the transverse links and applied for this purpose over the entire width of the strip. After depositing the strips of adhesive, a second narrower strip is unwound from a second

  spare coil and laid in the middle of the wider band.

  To form the longitudinal connections is applied to the upper face of the narrower strip along its longitudinal edges, continuous adhesive strips. Then, the edges of the lower band that protrude are folded over the edges of the upper band glued and the two strips are tightly pressed against each other. At all locations on

  which a strip of adhesive has been deposited transversely

  dirty on the lower band, both bands stick

  then to one another by constituting the transboundary

  dirty. The longitudinal connection is formed by the longitudinal edges of the two bands overlapping so that there are no undesirable edges that form on the longitudinal edges of the two strips. After tightening the strips are cut each time in the vicinity of the cross connections in sections of pipe which have the

form of sachets.

  Compared to the known method of hot welding, the method according to the invention has the significant advantage of being implemented in a continuous process which allows to significantly increase the speed of production. Both investment costs and the necessary locations are significantly reduced. In the hot-welded process, the production speed is limited substantially by the fact that during soldering of the edges a quantity of heat must be supplied during a determined time, ie the process flow is intermittent. The use of an adhesive makes it possible to eliminate this limitation factor. The method according to the invention makes it possible in particular to solve without problem carrying out the transverse connection by means of adhesive since the strip of adhesive is covered by

  the upper band. The elements necessary for the operation

  bending of pipes of the conventional type are only 2488s20

more used.

  The process according to the invention has the additional advantage that relatively inexpensive materials can be used. Materials that can be heat welded are more expensive than those that can not be heat welded and that have at least the same filtering properties. Folding the longitudinal edges of the lower band over the longitudinal edges with adhesive from the upper band is considerably simplified if the marginal areas of the lower band

  are folded before depositing the adhesive.

  Usually the strips used according to the invention are constituted by a nonwoven fibrous material. This material has good filtering properties and lends itself well

adhesive bonding.

  However, strips made of other textile materials can also be converted into filter pipes with a high production speed by the method according to the invention, which was not possible until now, since in the case the use of a material that can not be welded by heat, only a seam could be used to

  cross links. The sewing method is, however,

  expensive in its application technique.

  The gluing of the filter pipes also includes

  the advantage that larger material can be -

  used, material that can be glued but not welded.

  When the filter pipes according to the invention are used for filtration of the milk the filter material is partially exposed to high pressure which occurs when the milk is pressed through the filters. So that the filters are not destroyed it is therefore desirable to use a larger material possible. In addition, a bulky material has the advantage of increasing the filtration effect. In order to comply with the legislative requirements

  food, it is indicated, if the pipes according to the invention

  milk filtration pipes, that the adhesive is a food adhesive, preferably a

hot food adhesive.

  The invention furthermore relates to a filtering pipe, in particular a milk filtration pipe, made of web materials preferably constituted by textile webs, these materials being assembled in pipe by overlapping longitudinal connections, and which presents in addition, glued cross links to determine pouch-shaped pipe sections.

  Compared with the described state of the art, the invention

  This is based on the problem of making filtration pipes of the kind mentioned above so that they can be manufactured more quickly, at a lower price, and from various materials in edge-borne filter pipes.

longitudinal overlapping.

  According to the invention, this filtering pipe is characterized in that it has a wider lower band on which strips of adhesive are applied in order to form the transverse links, a smaller upper band being placed on the lower strip, in that the longitudinal edges of the upper band have continuous strips of glue and the edges of the lower band are folded and glued to the marginal portions of the upper strip carrying strips of glue for the purpose of forming longitudinal links. Other features and advantages of the invention

  will still appear in the description below.

  In the accompanying drawings: Figure 1 shows an example of implementation of the filter pipe manufacturing process in six operations; Figure 2 is a section along the line II-II of Figure 1; FIG. 3 is a section along line III-III of FIG.

Figure 1; -

  Figure 4 is a section along the line IV-IV of Figure 1; Figure 5 is a section along the line V-V of Figure 1; Figure 6 is a section along the line VI-VI of Figure 1; Figure 7 is a section along the line VII-VII of Figure 1; and Figure 8 is a perspective view of a pipe of

filtration completed.

  FIG. 1 shows a reserve coil 1 from which a wide band 2 is produced which, by means of a folding device 3, at a short distance from the unwinding point of the coil 1, is folded in such a way that that the lateral edges are brought to the form indicated in FIG. 2. Then, the marginal zones 4 are folded outwards again so that fold lines 5 are formed which are recognized on the sectional view.

represented in FIG.

  During the continuation of the method, a device 6 deposits at predetermined intervals and over almost the entire width of the strip 2 an adhesive tape 7 on the lower strip. FIG. 4 shows a sectional view through the zone IV-IV of FIG. 1, the adhesive tape

7 being applied on the strip 2.

  A second reserve coil 8 is then set

  a band 9 which is supported by a roller 10 on the band 2.

  The width of the band 9 corresponds to the spacing d between the folds 5. In FIG. 5, a section is shown along the line VV of FIG. 1 and it comprises the lower band 2 with the folds 5 and the 4, the adhesive tape 7 deposited thereon, as well as the narrower strip 9 placed on the lower strip 2 and the adhesive strip 7. By means of a device 11, the

  upper part of band 9, along the long edges

  tudinal, continuous ribbons of adhesive 12 along the length. A cut through this VI-VI zone is

shown in Figure 6.

  The next step is to fold the lower band

  2 along the fold 5 by means of a device 13 which also comprises conventional fixed folding elements not shown, so that the marginal areas 4 of the lower strip 2 are folded over the marginal areas of the strip 9 on which strips of adhesive 12 have been deposited. FIG. 7 shows in cross-section a filtering pipe whose folding and gluing are finished, the folded edges 4 of the strip 2 being glued by the strips of

glue 12 on the strip 9.

  A cutter 14 cuts the filter pipe

  in the vicinity of transverse pipe seams 7

  filtering apparatus in the form of pouches 15 of predetermined length

  as shown in Figure 8.

  FIG. 8 is a perspective view of a finished pocket-shaped filtration pipe 15 whose longitudinal connections 16 consist of the folding of the marginal zones 4 of the lower, wider strip 2 over the marginal zones of the strip. upper 9 narrower and by gluing one on the other. The end opposite the open end of the filter pipe in

  form of a bag is glued along a transverse link

dirty 17.

  The strips (2, 9) are preferably constituted by textile webs. , in particular of non-woven fibers. The thickness of the strips (2, 9) is preferably such

  that their density is between 15 and 500 g / m2.

  that their density is between 15 and 500 g / m

Claims (6)

  A method of manufacturing filtration pipes, in particular milk filtration pipes, made from web materials, preferably consisting of textile webs, in which these materials are unwound from reserve coils and assembled into a pipe by longitudinal bonds glued by overlap and are then provided with transverse links and cut each time in the vicinity of these transverse links   pipe sections in the form of sachets, characterized   in that on a wider lower band (2) is applied an adhesive (7) in the form of strips spaced apart from each other for the purpose of constituting the transverse links, then a narrower upper band (9) is deposited on the lower band, that on the top of the longitudinal edges of the upper band (9) of the continuous strips of adhesive (12) are deposited to form the longitudinal connections (16) and the edges (4) of the strip lower (2) protruding are folded and pressed on the coated marginal parts   adhesive strips (12) of the upper band (9).   2. Method according to claim 1, characterized in that before the application of adhesive (7), the marginal portions (4) of the lower band (2) are folded   beforehand in order to constitute the longitudinal links nales (15).   3. Process according to any one of the claims   1 or 2, characterized in that the strips (2, 9) consist of textile plies, preferably of nonwoven fibers.   - 4. Method according to claim 3, characterized in that the thickness of the strips (2,9) is such that the density is between 15 and 500 g / m   5. Process according to any one of the claims   in that the adhesive used is a glue hot or cold.   6. Filtration pipe, in particular milk filtration pipe, made of web materials preferably constituted by textile webs, these materials being assembled in pipe by overlapping longitudinal connections and which, moreover, have bonded transverse links, determining pouch-shaped pipe sections, characterized in that the filtering pipe (15) has a wider lower band (2) on which strips of adhesive (7) are applied to form the transverse links ( 17) a smaller upper band (9) being placed on the lower band (2), that the longitudinal edges of the upper band (9) have continuous strips of glue (12), and that the edges (4) of the lower band (2) are folded and glued to the marginal portions of the upper band (9) emerging from the glue strips (12) for the purpose of forming the longitudinal links (16).