FI63524C - FOER FARING FRAMSTAELLNING AV FILTERELEMENT - Google Patents

Description

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'11) UTLÄCCNINOSSKRIPT 6 3 5 2 4 C / 40 Patent ny onnet ly 07 07 1933 Patent oedöelat ^ (S1) ICv.lk.3 / lnc.CI.3 B 01 D 27/06 FINLAND —FINLAND (21) Λ * * «» ΊΙΙ »» | ς · η »ιι · - PKantMaMuiiitg 772038 (22) HakumhpUvt — AntMutlnpdac 30.06.77 (23) AlkupUvt — Gllttgh« t * dag 30.06.77 (41) Tullut JulkMcH - Uhrit effuntNg 0 ^. pgtMitti-) · r «kift« rlhallltut / 44) NthttvUuipvMfl | t kuLjulktlnn pvm.— patent- och r * Fift * rftyr «lMn AmMum utligd oeh utljkrHtun publicurad 31.03.83 (32) (33) (31) Pw4« ** y atuoikmn— «ujinl prtorftut 03.07.76

England-England (GB) 27786/76 (71) Lucas Industries Limited, Great King Street, Birmingham B19 2XF,

England-England (GB) (72) Robert Bell, London, David Nigel Lonsdale, Hampton upon Thames,

Middlesex, England-England (GB) (Jk) Leitzinger Oy (5k) The present invention relates to a method for manufacturing a filter element, in which a longitudinal bend is formed next to at least one longitudinal edge of a rectangular plate of filter material, at least one longitudinal edge is formed. parallel parallel bending lines extending perpendicular to the longitudinal bending line.

Filter elements such as those shown can be used, for example, to filter particles from the air stream used in an internal combustion engine to form a fire mixture, and such filter elements are available in both flat or cylindrical form, with a flat or plate type often required when the engine compartment has a low profile. this is the case for other current types of motor vehicles). The problem, however, is to ensure that the ends of the pleat set are firmly attached to each other to form a plurality of cakes and thus to avoid cracks in those pockets, which result in at least,,,. l. ”f fa i si su o d i nma t e r i a a 1 i n.

some of the liquid to be filtered would pass 2,63524

Glue can be used to join said folds together into pockets, but this in turn results in the problem that once the pockets are formed in the finished filter element, it is difficult to keep them at the desired distance from each other.

To date, interleaved gear-shaped vanes have been used in a known device for manufacturing such filter elements, but care must be taken to ensure that these vanes do not come into contact with any adhesive used, and in addition the speed of the device and therefore the production of filter elements is limited. In addition, the use of such wings to form pleats may result in the pleats not being glued together over the entire depth of the pleats due to, for example, problems with wing orientation and timing, and the resulting pockets may indeed subsequently have unfavorable gaps such as at the ends. .

The object of the present invention is to provide a method of manufacturing a filter element which can be carried out at a relatively high speed and which avoids the above-mentioned disadvantages.

The method according to the invention is characterized in that the filter material outside the longitudinal bending line is bent inwards on the adjacent filter material part, after which the filter material sheet is bent around the parallel bending lines to form a series of pleats, and then the ends of the pleats are joined directly together to form a plurality of pockets there are four layers of material.

The surface of the sheet of filter material can advantageously be provided with a series of spaced-apart protrusions integral with the plate embers. Other features of the invention will be apparent from the subclaims.

In the following, the invention will be explained in more detail with reference to the accompanying drawings, in which: 3 63524

Figure 1 is a perspective view of an embodiment of a partially folded filter element made in accordance with the invention, however, the element being shown without protrusions that can be formed in the filter material.

Figure 2 is a plan view of a filter element constructed in accordance with the invention.

Figures 3 and 4 are end and side views, respectively, of the filter element shown in Figure 2, with Figures 2, 3 and 4 showing said protrusions.

The filter element constructed in accordance with the invention shown in Figure 1 is formed of a generally rectangular filter material sheet 10, which may be a conventional and known material, such as resin impregnated paper. Said plate 10 is provided at suitable distances along its entire length with a plurality of spaced, parallel and transverse fold lines 11, and at the same time the plate is also provided with a plurality of spaced integral protrusions 12 (as can be seen, for example, in Figures 2, 3 and 4). Such protrusions 12 are formed by arranging a filter material on the wells, so that the protrusion on one surface of the plate corresponds to a recess on the other surface of the plate. In addition, the protrusions 12 are arranged so that some protrude from one surface while the other protrudes from the opposite surface.

The plate 10 is also folded at least at one edge, and as shown in this case it is folded at both opposite edges extending transversely to said fold lines 11, i.e. from its two longitudinal edges, to provide the parts indicated by reference numeral 13 which are folded into the rest of the plate. inwardly over the adjacent portion of the plate, forming a material twice the thickness of each longitudinal edge.

In this case, the sheet of material 10 provided with fold lines 11 can be folded along said fold lines to obtain a plurality of folds, as shown in Fig. 1 on the right. In addition, if the adhesive is applied to the outer surfaces of the parts 13, several are formed.

4,63524 in general, the associated pockets indicated by reference numeral 14. The purpose of said protrusions 12 is to ensure that said pockets remain open, as shown, for example, in Figures 2 and 4, whereby the protrusions on opposite sides of the pocket adhere to each other as shown in these figures. However, when folding, it is necessary to protect these protrusions so that they do not wrinkle and thus become ineffective. These folded portions 13, which allow the material to double in thickness at each of its longitudinal edges, provide such protection for the protrusions 12 when folding. However, if such parts 13 were to continue integrally along the longitudinal edges of the plate 10, it is clear that when bending is performed, at opposite ends of every other fold, parts of such material 13 are located outside the folds formed by said folds. Ts. the subsequent fold performed along the fold line 11 next to the already folded part according to Fig. 1 causes parts of the parts 13 to be located in the bottom part of the next formed pocket, and these additional parts naturally lie inside the fold point forming the bottom of the pocket. On the other hand, the next fold causes the parts 13 of said parts to be located outside the next fold to be provided, these parts being, of course, at the upper end of the next pocket. Such parts will be under tension and unless such tension is removed or alleviated, the filter element will tend to rotate or twist about an axis substantially parallel to said fold lines 11, which in turn is not acceptable in a flat or plate-like element. In order to prevent this from happening, some material is removed from said parts 13 in the vicinity of the ends of the fold lines which, according to Figure 1, extend along the upper part of the filter element. Such removal of material can be performed in any known manner. This can be done, for example, by cutting holes or cavities at suitable intervals along the two longitudinal edges of the plate 10 before folding the parts 13 to form a fold, such cavities being located at the end of every other fold line. According to Figure 1, the plate 10 may alternatively be provided with such cavities as indicated by reference numeral 15 after the parts 13 have been folded around, and the cavities may be formed, for example, with a knife or cutting blade. As previously mentioned, glue is also applied to the outer surfaces of the parts 13, forming a plurality of interconnected pockets 14 when the plate 10 is folded, keeping the protrusions 12 open, exposing the maximum area of filter material to the filter material (such as air) flowing from the filter element. side to side. When comparing hitherto known filter elements with a similar overall size to the element according to the invention, it can be stated that the filter element according to the invention thus provides a larger filtration range. In addition, when forming the filter element according to the invention, the aforementioned helical vanes and timing devices for them can be omitted, and the bellows can be formed by successively applying a series of spaced, parallel fold lines, the bellows being completed by pushing the material longitudinally ), and the pockets, which are then formed when the adjacent bellows adhere to each other with glue, are automatically located at the desired distance from each other because said protrusions 12 adhere to each other and cooperate with the circumferential parts 13.

The filter element formed as described above can be used in a flat or plate-like form, in which case it is attached to a synthetic resin substrate or a substrate formed by a metal basin. Alternatively, such a filter element may be arranged in a generally cylindrical roll, in which case the material need not be removed from said inwardly folded edge portions as described above, the filter element then tending to twist or warp into a generally curved or cylindrical shape.

In addition, although the protrusions 12 formed in the filter material are circular in the embodiment shown, it will be appreciated that they may be elongate or in some other shape or may be omitted altogether.

Likewise, instead of forming cavities 15 to relieve or relieve tension when the filter element is used in a flat form as described above, the filter element can be split twice the thickness at the ends of the fold lines 11 where the parts 13 are located outside the bellows folds, i.e. correspond to the location of the cavities shown in Figure 1. Such a splitting can be performed by means of a pair of rollers used to form said fold lines 11, the second roll having a series of circumferentially spaced outwardly projecting projections and the second roll having a series of corresponding grooves, each end of the second projection and the cooperating groove being formed relative to each other so as to split the material as described above.

Claims (9)

A method for producing a filter element, in which a method in a rectangular disc (10) of filter material is formed, at least one longitudinal edge forming a longitudinal folding line, a plurality of spaced parallel folding lines (11) extending perpendicular to the longitudinal folding line, characterized in that the filter material (13) outside the longitudinal folding line is folded inwardly on the adjacent filter material part, whereupon the filter material sheet is folded about the parallel fold lines (11) to form a series of folds and the ends are then joined together at the ends. to form a number of pockets (14) such that at least one end of each pocket contains four layers of material. 2. A method according to claim 1, characterized in that first a number of uprights (12) spaced apart from each other are formed in the filter material disk. Method according to Claim 1 or 2, characterized in that the filter material is formed flat or disc shaped into the mold. Method according to any of the preceding claims, characterized in that material is removed from the folded edge portions at areas (15) located at the ends of the fold lines (11) located in the folded position of the filter material disk at the edges of the orifice openings. the filter element pockets (14). 5. A method according to any one of claims 1-3, characterized in that slots are cut into the material through the folded edge portions at the ends of the fold lines (11), which in the folded position of the filter material are located at the edges of the orifice openers for the pockets of the filter element (14). Process according to any of the preceding claims, characterized in that the filter material is made of resin impregnated paper.