Manufacturing container or tube from paper; or other manufacturi – Bending – Folding
Patent
1989-06-21
1990-12-11
Fisher, Richard V.
Manufacturing container or tube from paper; or other manufacturi
Bending
Folding
493416, 493425, 493434, 493941, 55500, 55521, 55DIG5, 210232, 2104933, 156474, B01D 2706, B05B 114
Patent
active
049766775
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a process for the production of filters, and to a filter produced by the process. It relates more particularly to those filters (and their production) whose active filtering part is made up of a folded filter material web, preferably made from paper, which folded web is delimited in the process by side edges at which the folds terminate, and end edges at which a first or last fold is located, so that in this way filter units are formed, in which connection, in the production of the filter units, a blank is first produced in an automatized process in which the filter material web is creased and pushed together to form the folds with formation of predetermined spacings between the folds during advancement of the folded web, and the said side edges of the web are joined by means of strips, such that the ends of the folds are covered over and fixed by means of the strips, and thereafter this blank, which is thus produced continuously and which comprises the folded material web and the strips arranged on its side edges, is cut off to form the filter units.
PRIOR ART
There exist, for a number of different filtering purposes, filters which use as their filtering element a folded filter material web, generally employing a pervious paper. Such filters are normally intended to have a limited service life after which they are replaced by a new, clean filter. The cleaning and maintenance of the filter element itself is therefore only possible, in the case of dry and pulverulent impurities, by blow cleaning occasionally between the replacements.
Filters of this type are produced conventionally in different sizes and shapes where the filter material web forms configurations such as parallelepipedic bodies, cylindrical bodies, or with other shapes in larger or smaller sizes. These bodies can be completed with sealing strips of different types and are generally intended to be inserted in filter housings which constitute a permanent piece of equipment. However, there are also filters of this type which have a filter housing which is intended to be discarded together with the filter, so that the entire filter unit is exchanged at one replacement.
Technical Problem
In the case of filters which are in this way intended (at least their filtering unit itself) to have a limited lifetime, it is important that the production costs be kept low, so that the replacements do not impose an excessive economic burden on the user. Since the filters must have a number of different designs and sizes depending on the application, it is difficult to achieve a highly automatized manufacture, except possibly for certain types which are used in large numbers. There is thus a problem involved in achieving an efficient manufacture also for those filters which are not used in very large numbers.
Solution
The said problem is solved in the invention by the process being carried out such that the spacings between the folds are maintained constant on application of the strips and during the advancement by means of the threads of at least one screw element pushing down between the folds, which threads thus form spacing elements, and the rotating of the screw element or elements, such that the threads follow the folds during the advancement, and such that several filter units produced in this way are assembled in a casing to form a filter having a filter surface which corresponds to the combined surface of the units included.
Advantages
The present invention provides a process for the manufacture of filters, and a filter produced by the process, which permits a highly automatized manufacture even where the numbers are relatively small.
DESCRIPTION OF THE FIGURES
The attached drawings show a number of embodiments of the invention. FIG. 1 shows a machine for the production of filter units, seen schematically in a plan view; FIG. 2 shows the same machine seen in a side view; FIG. 3 shows the machine in an end view; FIG. 4 shows a filter unit in perspective in a first design; FIG. 5 shows an as
REFERENCES:
patent: 3127341 (1964-03-01), Abeles
patent: 4243943 (1966-04-01), Getzin
patent: 4589983 (1986-05-01), Wydeuar
patent: 4617122 (1986-10-01), Kruse et al.
patent: 4728426 (1988-03-01), Rudinger et al.
patent: 4798575 (1989-01-01), Siversson
Fisher Richard V.
Flodins Filter AB
Millard Wanda L.
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