CZ27506U1 - Means to fix span of material storerooms - Google Patents

Description

The technical solution concerns the design of fixed warehouses, especially for filters.

BACKGROUND OF THE INVENTION

U.S. Pat. No. 4,778,441 discloses an apparatus for folding a web of material, which consists of an embossing roll having concave and convex embossing elements. Stacked material is guided between the two rollers. Furthermore, DE-OS 42 01 288 discloses a method and a machine for the production of paper filter material, which operates with a pair of open strips made of knurled knives. From CZ 293 305 a device is known using ultrasonic material for defining the fold line of the strip to support the embossing effect.

The decisive parameter of each filter is, in addition to trapping particles of a certain size, the throughput of the amount of filtered medium to which the surface area of the filter surface is closely related. To obtain maximum filtration area, it consists of folding at regular folds and a certain height where, especially in air filters, it is necessary to ensure the same spacing of the folds to optimize the flow of the filtered medium through the filter and thereby minimize the pressure drop. This can be done with double-sided flat filters or circular filters with one-sided fixation of the spacing of the folds using strips attached to the top of the folds. To minimize the pressure drop of the filter and the size of the filter, especially for mask filters, the width of the fixation bands must be kept to a minimum. Rigid material stores, where increased rigidity is provided by hardener penetration, are formed by squeezing the indentation into the top of the warehouse. For non-woven soft materials, dimensional stability of warehouses by thermofixation can be ensured. However, these methods are not suitable for materials made of soft, flexible nonwoven, eg nanofibers.

The essence of the technical solution

The aforementioned drawbacks are solved by a means for fixing the material folds by means of a thread, preferably a bicomponent thread, which solution is advantageous for the formation of regular and / or irregular, dimensionally stable folds in both rigid and soft filter materials (nonwovens). Special threads, preferably bicomponent threads formed by a core, on which a thermoplastic material with a lower fusibility than that of the core, is applied, are used to fix the pitch of the folds. In order to ensure a defined distance between the individual folds, it is necessary to fix them on the lower part of the folds by means of preferably bicomponent threads which contain a fusible component in their outer layer. This fixation of the distance between the folds ensures easier bonding of the stacked and fixed filter elements, for example in a circular shape. Preferably, the yarn is placed in folds on the inside diameter of the filter.

By melting the surface layer, the threads can be glued to the tops of the folds. By the number of threads glued it is possible to secure the transverse alignment of different lengths of folds. The thread diameters are negligible in terms of increasing the pressure drop of the filtered air mass.

Clarification of the drawing

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view of a filter material stacked in regular, dimensionally stable folds fixed at the bottom of the folds by a preferably bicomponent yarn.

Example of technical solution implementation

Fixation of the folds 3 of the filter material 2 by means of a thread 1, preferably bicomponent threads, in which regular, dimensionally stable folds of soft filter materials 2 (nonwoven fabrics) are formed and special threads 1, preferably bicomponent threads formed by the core on which a thermoplastic mass with a lower meltability than the core is deposited. That

It has been possible to provide a defined distance between the individual folds 3, it being necessary to fix them on the lower part of the folds 3 by means of yarns 1, preferably bicomponent, which contain a fusible component in their outer layer. This fixation of the spacing of the folds ensures easier bonding of the stacked and fixed filter cartridges, for example into a circular shape. The thread 1 is preferably located in the folds 3 on the inner diameter of the filter material 2.

By melting the surface layer, the threads 1 can be glued to the tops of the folds 3. By the number of glued yarns i it is possible to secure the transverse alignment of different lengths of folds 3. The yarn diameters i are completely negligible in terms of increasing the pressure drop of the filtered air mass.

Industrial applicability The fixation of warehouses by means of thread is applicable in the production of various types of filter inserts, resp. for products for which regular and / or irregular warehouses are to be created, eg 3D textiles, etc.

Claims (3)

Means for fixing the spacing of material folds, characterized in that for fixing the spacing of regular and / or irregular shape-stable folds (3) of soft film15 nonwoven materials or nonwovens, it consists of a thread (1) fixed at the bottom of the fold (3) . Pitch fixation means according to claim 1, characterized in that the thread (1) is a bicomponent thread containing a melt component in its outer layer. The material storage spacing fixture according to claim 1 or 2, characterized in that the thread (1) is a bicomponent thread, consisting of a core on which a thermoplastic is applied. 20 a mass with a lower fusibility than the core.