JP5972634B2 - Pleated filter manufacturing method - Google Patents

Description

  The present invention relates to a method for manufacturing a pleated filter.

  Conventionally, a cylindrical pleated filter 11 having zigzag folds as shown in FIG. 1 is known as one of the filter shapes. The pleated filter 11 can secure a larger filtration area even with the same size as a mere cylindrical filter without a crease, thereby efficiently capturing fine particles in liquid or gas. However, since these can be removed, they are used in various applications.

  Such a pleated filter 11 is generally formed by folding a sheet-shaped multilayer filter medium and making a zigzag crease, then cutting it, and then cutting the inner part of the cut filter medium near the edges E1 and E2. It is manufactured by performing “endless processing” in which the side surfaces are superposed and ultrasonic welding is performed.

  However, such a method for manufacturing a pleated filter has a problem that it takes a very long time to manufacture since the zigzag folds are folded one by one, and the production efficiency is not good. In addition, among the above manufacturing processes, especially for “endless processing”, it is difficult to automate by a machine, and generally, manual work is performed, so that there is a problem that a difference in quality is likely to occur and a manufacturing cost is likely to increase. there were.

  Furthermore, pleated filters that have been “endless processed” are ultrasonically welded with some of the surfaces of the filter media overlapped, so the filter media in this part melts, and this part does not function as a filter. There was also a problem that the area was reduced, causing pressure loss during filtration.

  Also, in the conventional manufacturing method, when using a filter material that is thick and difficult to crease, such as glass fiber, ultrasonic welding becomes very difficult and endless processing cannot be performed. There was also a problem that the filter could not be manufactured.

  Under such circumstances, the inventor of the present application has made extensive studies on a method of manufacturing a pleated filter without performing endless processing while shortening the time required for making a zigzag crease to increase production efficiency. . As a result, the inventor of the present application has a cylindrical filter medium, a core mold having a plurality of ridges on the outer surface, and an outer mold having a plurality of ridges on the inner surface. The present inventors have found that the above-mentioned problems can be solved by manufacturing a pleated filter by passing it between the two.

  In applying the present invention, the present inventors and applicants investigated past patent documents and the like. As a result, the following documents were found regarding the manufacturing method of the pleated filter. It was not possible to find a patent document detailing a specific idea.

JP-A-9-212269 Japanese Patent No. 4470719

  The present invention provides a method for manufacturing a pleated filter without performing endless processing, while reducing the time required for making zigzag creases and improving production efficiency by a completely new method that has not existed before. Objective.

  As a means for this, the method for producing a pleated filter according to the present invention includes a cylindrical filter medium, a core having a plurality of ridges on the outer surface, and a plurality of ridges on the inner surface. The pleated filter is manufactured by passing between the outer mold and the outer mold, and the outer side of the core mold and the inner side of the outer mold have a tapered portion. It is characterized by.

  Moreover, in the above case, the manufacturing method of the pleated filter according to the present invention includes a plurality of rollers in which the core-shaped protrusions and / or the outer-shaped protrusions are arranged in series (tandem). It is characterized by being composed.

  Furthermore, in the above case, the method for manufacturing a pleated filter according to the present invention is characterized in that the core mold and / or the outer mold includes a heater for applying heat to the filter medium.

  According to the present invention, there is provided a method for manufacturing a pleated filter without performing endless processing, while reducing the time required for making a zigzag crease by using a completely new method that has not been conventionally provided, and improving production efficiency. be able to.

The figure which shows the conventional pleat filter. The figure which shows the filter medium 2 formed in the cylindrical shape. The figure which shows the core type | mold 3 and the outer type | mold 4 which concern on embodiment of this invention. The figure which shows the pleat filter 1 which concerns on embodiment of this invention. The figure which shows the core type | mold 3 which concerns on embodiment of this invention.

  Hereinafter, the form for enforcing the manufacturing method of the pleat filter concerning the present invention is explained. In the present embodiment, the filter medium 2 formed in the cylindrical shape shown in FIG. 2 is passed between the core mold 3 and the outer mold 4 shown in FIG. Manufacture. FIG. 3 is a view showing the front and side surfaces of the core mold 3 and the outer mold 4.

  As shown in FIG. 2, the filter medium 2 is composed of two sheet-shaped filter media 2a and 2b formed in a cylindrical shape, and the same sheet is provided in the vicinity of the end sides of the respective sheet-shaped filter media 2a and 2b. The outer side surface and the inner side surface of the filter medium are bonded to each other by a heat seal S so as to overlap each other. Here, the heat seal S is preferably affixed to the vicinity of the edges of the respective sheet-like filter media 2a and 2b with a minimum width so as to suppress the reduction of the filtration area as much as possible.

  As shown in FIG. 3, the core mold 3 has a tapered portion on the outer side thereof, and has a configuration in which the outer diameter of one end 3a is larger than the outer diameter of the other end 3b. It has become. And the core type | mold 3 has the some protruding item | line 3p on the outer surface. The plurality of protruding strips 3p are provided along the axial direction of the core mold 3 from one end 3a of the core mold 3 to the other end 3b.

  The outer mold 4 has a tapered portion on the inner side, and is configured such that the inner diameter of one end 4a is larger than the inner diameter of the other end 4b. And the outer mold | type 4 has the some roller 5, The thing with the same diameter as these rollers 5 is arrange | positioned in series (vertical) as shown in the figure. As described above, the rollers 5 are arranged in series so that the outer mold 4 has a plurality of ridges along the axial direction of the outer mold 4 on the inner surface thereof.

  And the number of the protrusions 3p of the core mold 3 and the number of rows of the rollers 5 of the outer mold 4 are configured to be the same. In addition, the core mold 3 and the outer mold 4 are arranged so that the end portions 5a of the rollers 5 are positioned in the middle of the adjacent two protruding strips 3p and 3p (near the recess 3q in the drawing). Has been.

  The filter medium 2 formed in a cylindrical shape between the core mold 3 and the outer mold 4 configured as described above is passed from one end 3a side of the core mold 3 and pulled out from the other end 3b side, whereby a pleat filter 1 is manufactured. At this time, since both the core mold 3 and the outer mold 4 have a tapered portion, the filter medium 2 whose diameter is gradually reduced can be passed without problems by forming a fold. It has become.

  Here, the core mold 3 includes a heater 6 therein so that heat can be applied to the filter medium 2. The heat of the heater 6 allows the pleated filter 1 to be firmly creased that is strong and difficult to return to the original.

  In the above embodiment, the distance between the concave portion 3q of the core mold 3 and the end portion 5a of the roller 5 is according to the traveling direction of the filter medium 2 (the direction from the one end 3a to the other end 3b of the core mold 3). It is preferable to make it gradually smaller. In this way, the pleat filter 1 is firmly creased and firmly foldable while suppressing the resistance when the filter medium 2 passes between the core mold 3 and the outer mold 4. Because it becomes possible.

  In the above embodiment, the rollers 5 having the same diameter are arranged in series in the outer mold 4, but as shown in FIG. 5, the roller 5 on the side close to the one end 4 a of the outer mold 4 is The roller 5 may be arranged in series with the outer die 4 so that the diameter gradually becomes larger than the roller 5 on the side close to the other end 4b of the die 4.

  Furthermore, in the above embodiment, the rollers 5 are arranged in series only on the outer mold 4, but a plurality of rollers may be arranged in series on the core mold 3 as the ridges 3 p. Absent. By setting it as such a structure, it becomes possible to suppress more the resistance at the time of the filter medium 2 passing between the core type | mold 3 and the outer type | mold 4. FIG. Moreover, it is also possible to apply a belt, a rib, etc. instead of a roller as the protrusion 3p. Furthermore, the roller 5 arranged in series with the outer mold 4 may be a convex strip, and both the core mold 3 and the outer mold 4 may have a convex strip. However, in this case, the resistance when the filter medium 2 passes between the core mold 3 and the outer mold 4 is somewhat increased.

  Moreover, in the above embodiment, as the filter medium 2 formed in a cylindrical shape, a two-layer filter medium is used. However, if the filter medium 2 is formed in a cylindrical shape, a single-layer filter medium or A multilayer having three or more layers can be used without any problem.

  In the present invention, it is also possible to change the shape of the crease applied to the pleated filter 1 by changing the width and tip angle of the end 5a of the roller 5. For example, when it is desired to make the pleated filter 1 a firm crease that is more acute and difficult to return to the original, the width of the end portion 5a of the roller 5 may be narrowed and the tip angle thereof may be an acute angle.

  Moreover, in the above embodiment, although the number of the row | line | column of the protruding item | line body of the core type | mold 3 and the roller 5 of the outer type | mold 4 is set to 16, respectively, naturally these numbers are limited to 16. However, it can be arbitrarily increased or decreased depending on the shape of the pleated filter 1 to be manufactured.

  Furthermore, in the above embodiment, the heater 6 is provided only in the core mold 3, but the heater 6 may be provided in the outer mold 4.

  The method for manufacturing a pleated filter according to the present invention has the above-described features, and according to the present invention, the time required for making a zigzag crease can be shortened by a completely new method that has not existed before. It is possible to provide a method for producing a pleated filter without increasing the production efficiency and without performing endless processing.

  Further, according to the present invention, the filter material of the pleated filter can be used even if it is thick and difficult to be creased like glass fiber. Furthermore, according to the present invention, since a pleated filter having no endless portion can be manufactured, a performance guarantee test (leak test) after completion of the filter becomes unnecessary, and the manufacturing cost can be suppressed. In addition, according to the present invention, the pleat filter can be manufactured by simply passing the filter medium 2 between the core mold 3 and the outer mold 4 without folding the filter medium, so that the number of folds (pleats) is reduced. Even if it increases, manufacturing time does not increase.

  Needless to say, the present invention is not limited to the pleated filter manufacturing method described in the above embodiments and examples, and the technical idea of the present invention is embodied in the scope of the present invention. It shall be included.

1: Pleated filter,
E1, E2: Edges 2 of the filter medium constituting the pleated filter 1: Filter medium,
3: Core type,
3a: one end of the core mold 3,
3b: the other end of the core 3
3p: ridge of core type 3,
3q: concave portion of the core mold 3 (intermediate between the two adjacent ridges 3p, 3p),
4: Outer mold,
4a: one end of the outer mold 4,
4b: the other end of the outer mold 4,
5: Roller,
5a: end of roller 5,
6: Heater S: Heat seal 11: Conventional pleated filter,

Claims (3)

There is a taper part on the outside and a core type having a plurality of ridges along the axial direction on the outer side, and a taper part on the inner side and the plurality of ridges on the inner side. The filter medium formed in a cylindrical shape is passed between one end side of the core mold and pulled out from the other end side so that the diameter thereof gradually decreases between the outer mold and the outer mold along the axial direction. A method for producing a pleated filter, characterized in that a pleated filter is obtained by :   2. The method for manufacturing a pleated filter according to claim 1, wherein the core-shaped ridges and / or the outer-type ridges are constituted by a plurality of rollers arranged in series. .   The method for manufacturing a pleated filter according to claim 1, wherein the core mold and / or the outer mold includes a heater for applying heat to the filter medium.

Images