JPH04310202A - Filter element and manufacture thereof - Google Patents

Abstract

PURPOSE:To simplify the structure of filter element and improve the filtering performance. CONSTITUTION:A filter medium 2 is made by folding filter paper a number of times in a zigzag manner and the peripheral edges of the filter medium 2 are firmly secured together with an adhesive agent 3, whereby the filter medium is fixedly held in a proper zigzag form and whereby a filter element thus formed is divided into a dust side and a clean side.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a filter element used for filtering fuel, oil, gas, etc.

0002

[Prior art] As a filter element,
There is one published in the -200122 publication. This device has an element body made by continuously folding a filter medium in a zigzag pattern, and a ring-shaped support plate having a large number of chevron-shaped closing protrusions that close the corrugated end opening of the filter medium, and both are integrally formed. This is what happens.

0003

[Problems to be Solved by the Invention] However, in the conventional filter element described above, the zigzag portion of the filter medium and the numerous chevron-shaped closing protrusions of the ring-shaped support plate are bonded with adhesive. A support plate must be provided. Therefore, problems arise in that the number of parts increases and the structure of the filter element becomes complicated. Also,
Since the chevron-shaped closing protrusions are inserted between the zigzag-shaped bent portions of the filter medium, the pitch of the zigzags naturally increases, resulting in a problem that the filtration performance deteriorates.

[0004] Furthermore, when manufacturing the above-mentioned conventional filter element, a tedious operation of inserting a zigzag-shaped filter medium between each chevron-shaped closing protrusion of a ring-shaped support plate is required.
There is a problem that assembly is complicated and manufacturing efficiency is poor.

[0005]

[Means for Solving the Problems] In order to solve the above-mentioned problems, the first invention is such that the zigzag-shaped edge of the filter medium folded in a zigzag manner is sealed with an adhesive, so that the filter medium is free from dust. The second invention employs a configuration of the filter element divided into a side and a clean side, and the second invention folds the filter medium in a zigzag shape, and then seals the zigzag edge of the filter medium with an adhesive. The third invention adopts a method for manufacturing a filter element that divides the filter into a dust side and a clean side, and the third invention applies an adhesive to both ends of a sheet-like filter medium, and then folds the filter medium in a zigzag shape. A filter element manufacturing method is adopted in which the zigzag-shaped edge portion is sealed with the adhesive and divided into a dust side and a clean side.

[0006]

[Operation] According to the first invention, the zigzag pitch of the filter medium is reduced, and the filtration performance is improved accordingly. Also,
There is no need to use a ring-shaped support plate, and the structure becomes simple. According to the second aspect of the present invention, it is sufficient to apply adhesive to the zigzag-shaped edge portion around the zigzag-folded filter medium. Therefore, the assembly operation becomes simple, and the separation between the dust side and the clean side of the filter medium becomes easy.

According to the third invention, the filter element can be assembled by folding the filter medium coated with adhesive in advance in a zigzag manner. Therefore, the assembly is simple, the adhesion is reliable, and the dust side and clean side of the filter medium can be easily distinguished.

[0008]

[Examples] Examples of the present invention will be described below. As shown in FIGS. 1 to 4, this filter element 1 includes a filter medium 2 formed by folding filter paper in a zigzag manner, and a filter medium 2 formed by folding filter paper in a zigzag manner.
It has a peripheral wall 3 made of adhesive surrounding the periphery.

As shown in FIG. 8, the filter medium 2 is a sheet whose width gradually becomes narrower toward both sides, and is folded in a zigzag pattern at right angles to its longitudinal direction, so that the overall outline is cylindrical. It is assembled in such a way that there are gaps little by little. There are many grooves 2 on the top and bottom of the filter medium 2.
a and 2b are formed, and in this case, the upper surface is a dust side into which dirty oil, etc. flows, and the lower surface is a clean side, into which filtered oil, etc. flows out.

[0010] As the filter medium 2, for example, Rinter 70%,
Thickness: 0.0mm made of 20% rayon and 10% pulp.
65mm, basis weight 180g/m2, air permeability 4.0sec
/φmm・300cc filter paper can be used. The peripheral wall 3 is cylindrical and has a flange 3a formed at its upper edge. The flange 3a is used for fixing the oil filter inside the case, as will be described later.

Note that if the flange 3a does not need to be used to support the filter medium 2, the flange 3a may be omitted. The peripheral wall 3 is integrally molded with hot melt adhesive. Hot melt adhesive has a specific gravity of 1.27 and a softening point of 189°C.
, an adhesive whose main component is a polyester resin with a melting viscosity of 1400 poise (200°C).

[0012] In addition, thermosetting adhesives such as epoxy resin adhesives or thermoplastic adhesives can also be used. The peripheral wall 3 made of adhesive surrounds the assembled filter medium 2, and the edge portion 2c of the filter medium 2 shown by the dashed line in FIG. 8 is buried in the thickness of the peripheral wall 3, and both ends The portion 2d is attached to the inner surface of the peripheral wall 3.

The filter medium 2 fixed in the peripheral wall 3 in this manner is interposed in a zigzag manner up and down along the central axis of the peripheral wall 3. Here, the manufacturing method of the filter element 1 will be explained. As shown in FIG. 6, a continuous filter paper roll 4, a creasing mold 5, a pressure roller 6, and a cutting machine 7 are arranged in one direction, and the filter paper unwound from the roll 4 is A continuous filter medium is processed into a zigzag pattern while passing through a crease mold 5, a pressure roller 6, and a cutter 7.

The creasing mold 5 is composed of a male mold 8 having a wedge-shaped cross section and arranged to cross the continuous filter medium, and a female mold 9 having a concave portion having a shape corresponding to the male mold 8. . The interval between the folded lines 12 can be changed arbitrarily by adjusting the feeding speed of the filter paper. The pressure roller 6 is composed of two rollers, upper and lower, and is configured to sandwich the wave-shaped filter paper with the creases 12 from above and below and flatten it before and after the creases 12. The filter paper is forcibly fed rightward by the pressure roller 6 and is bent in a zigzag manner at the crease 12.

The cutting machine 7 includes a cutting blade 10 arranged to sandwich a zigzag-shaped filter paper from above and below, and a backing plate 11. Both the cutting blade 10 and the backing plate 11 move up and down to cut the zigzag-shaped filter paper. The filter paper is cut at predetermined intervals. Thus, a drive unit (not shown) pulls out the filter medium from the winding body 4 and causes the filter medium to travel at a constant speed. Then, the mold 5 operates to form creases in the same direction at regular intervals on the filter paper, and the pressure roller 6 levels the filter paper horizontally again. However, the creases will not disappear.

The filter paper with the creases 12 is sent to the right by the pressure roller 6, and is pushed toward the cutting machine 7 while being folded in a zigzag manner at the creases 12. The cutting machine 7 cuts the filter paper sent while being folded in a zigzag pattern at regular intervals and discharges the filter paper. At this point,
The zigzag filter paper has a rectangular parallelepiped shape as a whole.

Next, as shown in FIG. 7, the zigzag-folded filter paper is mounted on a jig 14, and its periphery is traced with a band saw 15 while rotating the jig 14. Jig 14
has comb-shaped teeth 14a formed by providing a large number of cuts in the axial direction of the cylinder from one end surface side of the cylinder, and a zigzag-shaped filter paper is sandwiched between each tooth 14a. ing. This jig 14 is supported by a vertical shaft 14b, and can be horizontally rotated by a motor (not shown).

As a result, a filter medium 2 having a cylindrical profile as shown in FIG. 8 is obtained. Next, as shown in FIG. 9, a sheet 3b made of hot melt adhesive is placed on a horizontal heating plate 16 and is softened. The thickness of the hot melt adhesive sheet 3b is preferably about 1 mm. When the hot melt adhesive sheet 3b softens,
The cylindrical filter medium 2 is rolled thereon, and the zigzag edge 2c is sealed with a hot melt adhesive.

Further, while the hot melt adhesive is still soft, the flange 3a is formed by pressing the portion of the filter medium that protrudes above the cylindrical body against a flat plate. If the flange 3a is not required, this step is omitted. Thereby, the filter element 1 is obtained. In addition, as another manufacturing method, the filter paper obtained in the step of FIG. 6 is stretched flat, adhesive is applied to both ends of the filter paper, and then the filter paper 2 is formed by folding it in a zigzag pattern again and sealing it with adhesive. You can also. The filter medium 2 thus obtained is also divided into a dust side and a clean side.

The filter element 1 is, for example, housed in a case 17 as shown in FIG. 5 to serve as a fuel filter, and is used for filtering fuel such as gasoline. Case 17
It is divided into body 18 and cap 19. The body 18 has a cavity that accommodates the filter element 1,
It has a stepped portion 19 at the top that supports the flange 3a. An adhesive 20 is poured into the upper part of the flange 3a, thereby fixing the filter element 1 within the body 18. The adhesive 20 is omitted and the filter element 1
It is also possible to adhere to the body 18 by partially melting the hot-melt adhesive forming the peripheral wall 3 of. The cap 19 is attached to the body 18 by a seaming portion 21, and seals the inside of the body 18.

A fuel inflow pipe 22 is attached to the center of the cap 19, and a fuel outflow pipe 23 is attached to the lower part of the body 18. Next, the function of the filter element 1 will be explained together with the function of the fuel filter. Fuel flows into the case 17 from the inflow pipe 22 and toward the dust side of the zigzag-shaped filter medium 2 of the filter element 1. Then, the fuel is purified by removing foreign substances such as dust, passes through the filter medium 2, and reaches the bottom of the body 18.
From there it is taken out of the fuel filter through the outflow pipe 23 and sent to the carburetor.

Note that the filter element 1 is shown in FIG.
It is also possible to configure as shown in a), (b), and (c), respectively. That is, the rectangular parallelepiped or cubic filter media 24 and 25 obtained in the process shown in FIG. (a) and (b)), the four corners of the cube-shaped filter medium may be cut off to form a hexagonal bar-shaped filter medium 28, and the zigzag-shaped end portion thereof may be sealed with an adhesive 29 (Fig. 10(c)
)).

Although the filter element 1 has been described as being used for filtering fuel, it can also be used for other fluids such as oil and air.

[0024]

Effects of the Invention As described above, in the filter element according to the first invention, the zigzag edge of the zigzag-folded filter medium is sealed with an adhesive, so that the filter element can be separated from the dust side. Since the filter is divided into sides, the pitch of the zigzag becomes smaller, and the filtration performance can be improved. Further, since an adhesive is used to fix the zigzag edge of the filter medium, there is an advantage that the number of parts is reduced and the structure of the filter element is simplified.

[0025] In the method for manufacturing a filter element according to the second invention, a filter medium is folded in a zigzag shape, and then the zigzag edge portions of the filter medium are sealed with an adhesive to separate the filter medium into a dust side and a clean side. Because it is divided into
The assembly operation is simplified, and the separation of the dust side and clean side of the filter medium is also facilitated. The method for manufacturing a filter element according to the third aspect of the present invention includes applying an adhesive to both ends of a sheet-like filter medium, then folding the filter medium in a zigzag shape, and sealing the zigzag-shaped edges with the adhesive. Since the filter medium is divided into a dust side and a clean side, assembly is simple, adhesion is reliable, and the dust side and clean side of the filter medium can be easily distinguished.

[Brief explanation of the drawing]

FIG. 1 shows a second filter element according to the invention;
It is a sectional view taken along the line I-I in the figure.

FIG. 2 is a plan view of a filter element according to the invention.

FIG. 3 is an elevational view of a filter element according to the invention.

FIG. 4 is a perspective view of a filter element according to the invention.

FIG. 5 is a vertical cross-sectional view of a fuel filter using a filter element according to the invention.

FIG. 6 is an explanatory diagram showing the first half of the method for manufacturing a filter element according to the present invention.

7 is a perspective view illustrating a filter medium trimming step performed after the step of FIG. 6. FIG.

8 is a perspective view of the filter medium obtained in the trimming step of FIG. 7. FIG.

9 is an elevational view illustrating a bonding step performed after the step of FIG. 7. FIG.

FIG. 10 is a plan view of another embodiment of the filter element according to the invention. 1...Filter element 2...Filtering medium 2c...Edge portion 3...Peripheral wall 3a...Sheet of hot melt adhesive 4...Wrap body of filtering medium 5...Creasing mold 6...Pressure roller 7...Cutting machine 12...Creating 14...Jig 5...Band saw 16...Heating plate

Claims (3)

[Claims] 1. A filter element characterized in that the zigzag-shaped edge of the zigzag-folded filter medium is sealed with an adhesive to divide the filter medium into a dust side and a clean side. 2. Manufacture of a filter element characterized in that the filter medium is folded in a zigzag shape, and then the zigzag edge portions of the filter medium are sealed with an adhesive to divide the filter medium into a dust side and a clean side. Method. 3. Applying an adhesive to both ends of a sheet-like filter medium, then folding the filter medium in a zigzag shape and sealing the zigzag edge with the adhesive to divide it into a dust side and a clean side. A method for manufacturing a filter element, characterized by: