Manufacturing container or tube from paper; or other manufacturi – With cutting – breaking – tearing – or abrading – Including assembling or disassembling of distinct members
Patent
1987-02-20
1989-01-17
Schmidt, Frederick R.
Manufacturing container or tube from paper; or other manufacturi
With cutting, breaking, tearing, or abrading
Including assembling or disassembling of distinct members
493347, 493359, 493381, 493382, 493941, 156474, B05B 114
Patent
active
047985755
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a method and an apparatus for the manufacture of filters, and more specifically filters made from a folded continuous length of a thin material, in particular paper having a certain pre-determined pore size and pore density which only permits particles of less than a certain size range to pass through. The size of the filter is adapted for this purpose to fit precisely in a filter housing with two openings between which the filter is positioned, in conjunction with which the lateral edges of the filter are sealed, as a general rule by gluing or by bonding-on of a strip, so that a medium which is contaminated by particles can be forced through the filter material.
BACKGROUND
Filters of this kind have already been disclosed. Their manufacture involves folding a continuous length of paper, in conjunction with which the size of the pleats and their positions in relation to one another are determined by precise and uniform folding of the paper and by feeding the paper for securing by means of gluing or the bonding-on of an edge strip. The form imparted to the pleats is determined by the conditions associated with the manufacture of the pleats and the feeding of the continuous length of folded material, and variations in these conditions and in the characteristics of the paper will result in uneven pleats, which are then secured in the state which has been imparted to them.
TECHNICAL PROBLEM
In filters of the kind to which the invention relates, the surface area of the filter material is of major significance to factors such as the flow resistance and the take-up capacity, and is determined on the one hand by the size of the filter element and on the other hand by the depth and the density of the individual pleats. The overall size of the filter is usually restricted by the available space inside the filter housing. Because the external dimensions of the filter are restricted, the design of the pleats must be utilized in order to obtain a sufficient filter area for an optimum combination to be achieved between the depth of the pleats and their distance one from the other. Problems are caused by deep plates, however, in particular in the case of large filters, since the filter material becomes unsteady and the pleats tend to collapse, so that only a part of the surface area of the filter can be used. The closeness of the pleats is limited by the requirement for the medium which is to be filtered to be provided with sufficient space to be able to flow into the pleats. Furthermore, filters with close pleats become choked more rapidly by the particles, which limits the service life of the filter. In the case of deep pleats the pleats must be sparsely distributed, since the distance to be covered by the medium as it flows between the sides of the pleats is greater.
A major requirement exists in many areas for the filtration of a medium contaminated with particles through filters which possess good flow characteristics and at the same time exhibit stability such that the pleats do not show a tendency to collapse or to be deformed in some other way by the pressure of the medium being filtered against the filter element, or by vibrations or shocks. The need for stable filters offering good flow characteristics for the medium through the filter element is particularly great in the area of automobile filters, through which considerable quantities of air must pass in a given unit of time and which are constantly subjected to vibrations and shocks. Considerable technical development has meant that present-day automobile engines are now more sensitive than previously to external interference, such as dust and asphalt particles, with the associated risk of functional breakdowns, at the same time as the period between filter replacements is being extended, which has led to increased demands being placed on the filters. In the case of previously disclosed filters and the methods for their manufacture, these demands could not be satisfied in an optimum fashion due to the fa
REFERENCES:
patent: 1348846 (1920-08-01), Brown et al.
patent: 3321345 (1967-05-01), Duncan
patent: 3809199 (1974-05-01), Bessiere
patent: 3959056 (1976-05-01), Caplan
patent: 3998140 (1976-12-01), Andre 493941
Flodins Filter AB
Schmidt Frederick R.
Showalter Robert
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