Method, substrate and arrangement for a particle collection and a subsequent particle cleaning

Abstract

A method, substrate and arrangement for creating a particle collection and/or a particle cleaning of a surface part supporting loose or loosened particles. A piece of flexible sheet material, adapted to, via an electrostatic field strength, collect loose and/or loosened particles, and a support layer tightly cooperating with and supporting the piece of flexible sheet material, where both the piece and support layer are adapted to be air permeable for a cleansing of the particles within the piece of flexible sheet material. A use of generated air streams shall, under an overpressure and/or an underpressure, be allowed to pass through the substrate, in a deionized state, in a direction through the support layer and the piece of flexible sheet material. The piece of flexible sheet material forms a filter unit which is adapted at least for collecting of micro- and nano particles and activatable under an electrostatic field strength.

Claims

1. A method comprising: a first processing step (S1) of using a substrate (40) in an ionizing state and under an activated electrostatic field strength (70), to collect loose and/or loosened particles (P2; p2) from a surface part (2c, 40a, 2c) supporting the particles, the substrate comprising a piece of flexible sheet material (41) arranged to collect the loose and/or loosened particles (p2) from the surface part (2c, 40a, 2c) supporting the particles, and a support layer (42) cooperating with and supporting the piece of flexible sheet material (41), the piece of flexible sheet material (41) being impermeable to micro fibers and nano fibers, wherein both the piece of flexible sheet material (41) and the support layer (42) display electrically isolating and are gas and air permeable, wherein during said first processing step, the loose and/or loosened particles (P2; p2) are collected in the flexible sheet material (41); and a second processing step (S2), with the substrate being in a deionized state or under a neutral electrostatic field strength, of cleansing the flexible sheet material (41) of the collected loose and/or loosened particles, wherein in the second processing step, the flexible sheet material (41) is cleansed of the collected loose and/or loosened particles, using at least one of i) a generated air stream under an overpressure passing through the substrate (40) in a direction through the support layer (42) and the piece of flexible sheet material (41), and ii) a generated air stream under an underpressure passing through the substrate (40) in a direction through the support layer (42) and the piece of flexible sheet material (41).

2. The method according to claim 1, wherein the piece of flexible sheet material (41) is used as a filter unit (43) which is arranged to collect micro and nano particles, said support layer (42) displays through openings (42b) distributed air passages through the piece of flexible sheet material for air streams, under the underpressure or under the overpressure, wherein the total surface share of the openings (42b) belonging to the support layer cover at least 50% of the total surface area of the piece of flexible sheet material (41), and wherein the piece of flexible sheet material as well as the support layer are formed from an electrically isolating material.

3. The method according to claim 1, wherein the piece of flexible sheet material is structured with an increased density in the direction of an air passage, with an increased density within a bottom area and bottom extension of the piece of flexible sheet material for collection of micro particles and/or nano particles.

4. The method according to claim 1, wherein the piece of flexible sheet material has a thickness of 2 to 10 mm, while the support layer has a thickness of 1 to 5 mm.

5. A method comprising: using a substrate (40), within a first processing step (S1), collecting loose and/or loosened particles (P2, p2) from a surface part (2c, 40a, 2c) supporting the particles, in an ionizing state and under an activated electrostatic field strength (70), and in a second processing step (S2) cleansing the substrate from collected particles, in a deionized state or under a neutral electrostatic field strength, using a piece of flexible sheet material (41) comprising the substrate (40) and being impermeable to micro fibers and/or nano fibers, and wherein the piece of flexible sheet material (41) as well as its support layer (42) display electrically isolating and gas and air permeable properties, wherein the isolating, gas and air permeable support layer (42) is applied to the surface part of the substrate (40) and its associated piece of flexible sheet material (41) facing away from loose and loosened particles, wherein in the second processing step, the flexible sheet material is cleansed of the collected loose and/or loosened particles, using at least one of i) a generated air stream under an overpressure passing through the substrate in a direction through the support layer and the piece of flexible sheet material, and ii) a generated air stream under an underpressure passing through the substrate in a direction through the support layer and the piece of flexible sheet material.

6. The method according to claim 5, wherein the substrate comprising the piece of flexible sheet material and the support layer for collecting the particles is associated with an electrostatic field, and the electrostatic field has an adapted variable field strength (70) acting in relation to the loose and/or loosened particles, in order to collect the particles within the piece of flexible sheet material (41) by an attractive force adapted to the electrostatic field strength, acting on said loose and/or loosened particles.

7. The method according to claim 5, wherein the particles collected by attracting forces in a deionized state are removed using at least one air jet formed by an underpressure and/or an overpressure.

8. The method according to claim 5, wherein, before the collecting of loose and/or loosened particles in said first processing step (S1), the substrate (40, 40, 40) is ionized and associated with the activated electrostatic field strength (70), and immediately after the collection and storing of the loose and/or loosened particles within the piece of flexible sheet material, the substrate (40, 40, 40) is allowed to deionize the piece of flexible sheet material, the support layer and the particles to thereafter cleanse the piece of flexible sheet material from thus collected and neutralized particles.

9. The method according to claim 5, wherein the field strength (70) for the electrostatic field for a planar particle supporting surface part and a planar and parallel oriented substrate (40) is selected according to a decaying function or following a decaying function.

10. The method of claim 5, wherein in the second processing step (S2) of cleansing the substrate from collected particles, the generated air stream, under the overpressure, is passed through the substrate, in the deionized state, in the direction through the support layer and the piece of flexible sheet material to thereby cleanse the flexible sheet material by blowing away deionized particles collected within the piece of flexible sheet material.

11. The method of claim 5, wherein in the second processing step (S2) of cleansing the substrate from collected particles, the generated air stream, under the underpressure, is passed through the substrate, in the deionized state, in the direction through the support layer and the piece of flexible sheet material to thereby cleanse the flexible sheet material by blowing away deionized particles collected within the piece of flexible sheet material.

Description

SHORT DESCRIPTION OF THE DRAWINGS

(1) A previously known production plant with its shown three processing steps and a substrate, in the form of a presently proposed embodiment, displaying the characteristics associated with the present invention, and an arrangement, within which the proposed substrate may be used, will now be disclosed in closer detail with an exemplifying purpose, and described in relation to the appended drawings, in which:

(2) FIG. 1 shows a side view of the known production plant with its three serially oriented processing steps.

(3) FIG. 2 shows a schematic side view of a particle collecting and particle cleansing arrangement, where the particle collection depends upon an ionization of an electrically isolating endless substrate, arranged to pass immediately above a surface part arranged with loose particles, to concentrate, within a piece of flexible sheet material containing the substrate, loose and/or loosened individual particles under an electrostatically varying field strength.

(4) FIG. 3 illustrates, in a section along the substrate, the said piece of flexible sheet material and a support layer fixedly cooperating with the piece of flexible sheet material, where the piece of flexible sheet material is oriented immediately above the surface parts arranged with the loose particles.

(5) FIG. 4 schematically shows an electric coupling arrangement adapted to be a control equipment, arranged to, taking into consideration a number of selected control- or supervisory criteria, among other things control and supervise the individual ionization magnitudes of one or several charging electrodes and the efficiency of one or several discharging electrodes, among other things controlled to a minimized electric power for a maximized technical particle collecting effect.

(6) FIG. 5 shows an arrangement with an ionization electrode, oriented in a selected direction of transport for the substrate, before a unit arranged to cleanse the substrate and the piece of flexible sheet material from collected particles.

(7) FIG. 6 shows, in a heavily enlarged plan view, a support layer, in the form of a right-angled grid structure, illustrating its quadratic openings and threads surrounding the openings.

(8) FIG. 7 illustrates, in a heavily enlarged and simplified manner, two threads built up as a micro- or nano structure, that has been treated to form micro structure- or nano structure displaying bundles of thin straws, but where the shown illustration can be seen as very schematic and where the free ends of the shown micro or macro straws are oriented in immediate adjacency to and with a slightly dragging contact to the surface parts and across the surface parts arranged with loose particles, and

(9) FIG. 8 schematically shows an example of the time related progress of a decaying curve concerning electrostatic field strength.

DESCRIPTION OF THE PREVIOUSLY KNOWN PRODUCTION PLANT ACCORDING TO FIG. 1

(10) In the following description of prior art and the present invention, it seems appropriate to distinguish between different processed surfaces with mutually different coatings of dust and powder particles, where the following reference numbers have been selected as regards the change of the surfaces and the particle concentrations through the processing steps of the production plant.

(11) The reference number 2 illustrates a sheet which is movable through the plant, the upper surface 2a of which sheet is to be considered a raw surface and where this raw surface will go through various processing and treating modifications, which then are indicated with surface parts 2b, 2c and 2c.

(12) Thus, the raw surface 2a is untreated, and which surface 2a is processed in a grinding or polishing machine 3 in order to form a polished outer- or upper surface 2b, where this outer surface 2b displays a concentration of loose and/or loosened particles P (coarse grain size), with a broad spread of large and smaller particles after the described polishing using an abrasive paper 3a.

(13) The surface 2a can be assumed to be free from free or conglomerated particles, the surface 2b can be said to be provided with loose and coarse particles P in a mixture of large, coarse and smaller particles, the surface 2c can be said to, after a vacuum cleaning via a vacuum cleaner 4, be free from at least the coarser particles and be denoted P1.

(14) This outer- or upper surface 2b will now be vacuum cleaned via a vacuum cleaner 4, which thereby gives rise to an additionally particle freed P1 surface 2c.

(15) After an additional vacuum cleaner 4, a surface 2c arises, with an additionally vacuum cleaned surface part 2c with a set of particles denoted P2.

(16) This surface 2c is further processed in a spray plant 5 for applying an upper-most layer 2d, and where such layer 2d will cover any remaining particles P2, and therefore form a small elevation 2d; (P2).

(17) As the particles P2 follow, and are positioned below the layer 2d which the plant 5 applies, these particles P2 will, when applying the layer 2d thinly, appear as small elevations 2d or cavities, worsening the aesthetic appearance of a planar and blank upper surface 2d.

(18) The reference number 2a illustrates a surface which has yet to be leveled and processed by polishing 3, the reference number 2b illustrates a surface with coarse particles P accruing from the polishing in a particle concentration, a surface 2c illustrates a vacuum cleaning performed by a vacuum cleaner 4, with the particles P1, the reference number 2c illustrates the surface adapted for a finishing treatment with the particles P2, which has been additionally vacuum cleaned via a vacuum cleaner 4, which within the spray plant 5 is coated with an additional layer 2d, where this layer also encloses the particles P2 remaining within the previous process.

(19) The process steps 1a, 1b and 1c with associated pieces of equipment, are known as such, and are therefore not described in detail.

(20) However, the prior art does not disclose that the particle free surface 2c in many applications is not so free from particles as would be desirable, why the layer 2d will cover and embed remaining particles P2, either with a thin uneven (granular) surface 2d with its embedded particles (P2) or with an unnecessarily thick layer 2d.

Description of the Presently Proposed Embodiment

(21) Initially, it is noted that in the following description, of a presently proposed embodiment displaying the characterizing features associated with the invention and made clear by the figures shown in the enclosed drawings, we have selected expressions and a specific terminology with the intent of primarily clarifying the basic idea of the invention.

(22) However, in this context it should be taken into consideration that herein selected expressions are not to be seen as limited only to the herein exploited and selected terminology, but it is to be understood that each such selected expression is to be interpreted so that it additionally encompasses all technical equivalents working in the same or essentially the same way, in order to thereby achieve the same or essentially the same purpose and/or technical effect.

(23) Primarily, the present invention relates to a method, which initially shall be described according to the following.

(24) The method is adapted for, using a substrate 40, within a first processing step S1 (see FIGS. 2 and 3), collect loose and/or loosened particles from surface parts 40a supporting the particles, via an ionizing state and an activated electrostatically varying and time-decaying field strength 70, within FIG. 8, and within a second processing step S2 cleanse the substrate from collected particles p2, in a deionized state and a neutral electrostatic field strength, using a piece of flexible sheet material 41 which is impenetrable for micro fibers and/or nano fibers, and where the flexible sheet material 41 as well as its support layer 42 display electrically isolating and gas- and air permeable properties.

(25) At such a method it is proposed to, according to the teachings of the present invention, to the side of said substrate and its associated piece of flexible sheet material 41 facing away from its loose and/or loosened particles p2, apply an electrically isolating support layer 42, displaying gas- and air permeable criteria.

(26) Furthermore, it is proposed that the said substrate 40, with its flexible sheet material 41 and its support layer 42, for its particle collection, is associated with an electrostatic field, with a time-varying field strength 70 in relation to the loose or loosened particles P2; p2, so that a varying attractive force, adapted by the electrical field strength, can act on the said loose and loosened particles p2 and with the field strength collect the said loose and loosened particles within the flexible sheet material 41.

(27) In particular, it is proposed that the thus, by attracting forces, collected particles p2 shall, in a deionized state, be removed using a number of air jets formed using an underpressure and/or an overpressure.

(28) In particular, an endless substrate 40 is proposed, which, as seen in its direction of transport, immediately before a collection of loose and loosened, deionized particles, P2, p2, is to be ionized and associated with an electrostatic field strength 70, while the substrate 40, immediately after a collection and a storing of the loose and loosened particles p2 within the flexible sheet material 41, deionizes the piece of flexible sheet material 41, the support layer 42 and the particles P2, p2, and thereafter the piece of flexible sheet material 41 is cleansed from such collected and neutralized particles.

(29) In addition, according to the teachings of the present invention, it is proposed that the varying field strength 70 for the electrostatic field can be selected for a planar particle-supporting surface part 40a and a planar, or to any extent essentially planar, and parallel oriented substrate 40 only by allowing the field strength to vary, according to FIG. 8, along a selected decaying curve.

(30) Nothing prevents that the surface part 40a of the substrate is arranged with a shape which is tapered across the surfaces 2c, 2c to the right or to the left in FIG. 2, instead of a parallel oriented substrate 40, where a selected smallest distance d1 offers a larger attracting force.

(31) With reference to the enclosed FIGS. 2 to 7, the present invention is hence not only shown schematically and in detail, but the characterizing properties of the invention have also been given a concrete form, by the presently proposed and in the following in detail described embodiment.

(32) With renewed reference to FIG. 2, a particle collecting apparatus or arrangement 20 (corresponding to the vacuum cleaner 4 according to FIG. 1) according to the teachings of the invention is shown in a side view, using an outer surface part 40a belonging to the substrate and adapted for particle collection and particle concentration, and a surface part 40 which is likewise adapted for particle cleaning and belonging to the substrate, and the construction and function of which apparatus will be described in the following.

(33) A substrate, adapted for particle cleaning, with its surface parts 40, as shown in FIGS. 2 and 3 and displaying a piece of flexible sheet material 41 is adapted for collection of loose and/or loosened particles p2 (particles falling within the micro- and nano fields) and a support layer 42 tightly cooperating with and supporting the flexible sheet material.

(34) Both the piece of flexible sheet material 41 and the support layer 42 are to be adapted so as to be air permeable, with the only purpose of being able to perform the cleansing process which will be required in order to be able to cleanse off collected loose particles p2 and/or loosened particles P2, using a generated air stream, divided into diverging air jets.

(35) It is proposed that these jets are allowed to pass, under an overpressure, through the surface part 40 of the substrate, in a direction through the support layer 42 and the piece of flexible material 41, according to FIG. 5, and/or using a generated air stream, under an underpressure, are allowed to pass through the surface part 40, in a direction through the support layer 42 and the flexible sheet material 41.

(36) Then, the present invention teaches that for the surface part 40 of the substrate, the said piece of flexible sheet material 41 is to be adapted for, within a short strip subsection, form a filter unit 43 arranged at least for the collection of micro- and nano particles, in order to, within the first processing step S1 concentrate and store collected remaining coarse particles P2 and loose small particles p2 and within a second processing step S2 cleanse the flexible sheet material 41 from these particles P2 and p2.

(37) As for the second processing step S2, the said support layer 42, which supports the said piece of flexible sheet material 41, is to be adapted to display narrow through openings 42b (see FIG. 6) for a distribution of an air passage 30a, under an underpressure and/or an air passage 30b, under an overpressure, directed through the piece of flexible sheet material 41 primarily by air streams distributed by the support layer 42, as more or less concentrated air jets.

(38) The said piece of flexible sheet material 41 is to be considered, in relation to the support layers 42, as very dense, by the said piece of flexible sheet material 41 displaying a pronounced form of a micro- or nano fiber structure, arranged for collection and storing of said loose and/or loosened particles P2; p2.

(39) According to the teachings of the present invention, this collection may be performed as a consequence of the forces acting on the particles P2; p2 in an ionized state and an electrostatic field or a varying field strength 70.

(40) For this force affection, the particles p2 may be ionized with a first polarity or potential (+) or may be neutral, while the piece of flexible sheet material 41 and the support layer 42 may be ionized with a second, opposite polarity or potential ().

(41) This collection of particles p2 within the surface part 40 of the substrate and the piece of flexible sheet material 41 can take place by the forming of a directed electrostatic field, where the second polarity () may be imparted to the piece of flexible sheet material while the surfaces 2c, 2c with their particles are neutralized, alternatively that the piece of flexible sheet material 41 and the surfaces 2c, 2c are provided with a counter-directed electrostatic potential (+).

(42) The herein implied electrostatic fields and their different field strengths 70 are intended to affect the particles p2 with a force which results in that they are displaced from the surfaces 2c, 2c and in a direction towards the piece of flexible sheet material 41, and is stuck there in the micro- or nano threads of the flexible sheet material and are stuck primarily in its extremely narrow and thin straws 61a, 62a in FIG. 7.

(43) The substrate 40 shown in FIG. 3, in a longitudinal section, shall then display a piece of flexible sheet material 41 adapted for collection of loose particles P2, p2, and a support layer 42 for supporting the flexible sheet material, where both shall display electrically isolating properties, in order to be able to maintain and store the electric field while forming a decaying field strength 70.

(44) According to the invention, both the piece of flexible sheet material 41 and the support layer 42 are to be adapted to be air permeable, with a primary intent of cleansing the substrate 40 the collected dust particles P2, p2 using formed air streams.

(45) The herein implied air permeability can be used if, except for the implied ionization along the surfaces 2c and 2c, a vacuum cleaning adapted for the particle collection is to be used.

(46) A cleansing of the substrate 40 from concentrated dust and loose particles P2, p2, within the particle collecting arrangement or apparatus 20, may take place using one or several air streams. This cleansing process may take place only while the air jets 30b are activated using an overpressure 30c, and this air stream is in that case directed so that it can pass through the substrate 40 in a direction firstly through the support layer 42 and thereafter through the piece of flexible sheet material 41, according to FIG. 5.

(47) As a proposed alternative, the herein implied air streams, in the form of air jets 30a, may be formed by an underpressure, and these air jets may also pass the substrate 40 in a direction through the support layer 42 and the piece of flexible sheet material 41. A generated overpressure and its air jets 30b, as well as a generated underpressure and its jets 30a, may cooperate, or they may alternatively be used individually.

(48) Nothing prevents to allow these air streams and air jets to be activated in a pulsating manner through a pulse generating unit 30c, which is merely implied in FIG. 5.

(49) Nothing prevents that, for this cleansing process, air streams and air jets 30b are formed using an overpressure 30c, where these may be active on different parts of the substrate 40, and on different surface parts and from air streams and air jets 30a, from an underpressure, where these may be active on the different parts of the substrate 40 and on different surface parts.

(50) It is specifically taught that these air streams primarily are to pass through the piece of flexible sheet material 41 as more or less linear streams, directed through the support layer 42 and its holes or openings 42b, and as more pronounced turbulent streams through the flexible sheet material 41, in to order to break loose and loosen concentrated particles P2, p2.

(51) According to the present invention, the said piece of flexible sheet material 41 is to be dimensioned and adapted for forming a filter unit 42b, arranged for micro- and nano particles 2b and a capacity which is well adapted to the application.

(52) For this purpose, it will be required that the said support layer 42 is adapted to display densely oriented and small through openings 44, for via these densely oriented openings 42b distribute an air stream in the form of air jets through well distributed air passages, formed as channels and in the form of the implied openings 42b.

(53) Practical experience indicates that the total surface part of the openings 42b is to be adapted to cover the total surface of the piece of flexible sheet material 41 to at least 50% or somewhat less.

(54) If the present embodiment of the invention is considered, both the piece of flexible sheet material 41 and the support layer 42 are to be formed from an electrically isolating material, which is required in order for both the flexible sheet material 41 and the support layer 42, for their cleaning effect according to the invention, to be associated with a varying and decaying electrostatic field 70 via one or several associated ionization electrodes 33.

(55) According to the principles of the invention, the piece of flexible sheet material 41 may be structured with an increased density, in a direction against the direction of air passage through the flexible sheet material 41, with a structure and density adapted for micro particles and/or nano particles within the area of the flexible sheet material facing towards the support layer 42 and/or a bottom area thereof and its extension.

(56) In particular, it is herein proposed that a piece of flexible sheet material 41 of the present type can be associated with a thickness t1, in FIG. 3, of about 2 to 10 mm, perhaps about 5 mm, while the support layer 42 may be associated with a thickness t2 of about 3 to 5 mm, perhaps about 2.0 mm.

(57) The thickness of the flexible sheet material 41 and its construction are to be adaptable to the loose particles storing capacity of the piece of flexible sheet material, the time during which the storing is to take place and/or depending on the velocity of the substrate 40.

(58) Again referring to FIG. 2, an electrostatic particle collecting apparatus or arrangement 20 according to the invention will be described in closer detail.

(59) Here is shown and described, in a simplified side view, an arrangement 20 for cleaning of a surface part 2c, 2c supporting loose particles P2, p2.

(60) This arrangement 20, for cleaning of the surface parts 2c, 2c, supporting loose and/or loosened particles P2, p2, where the said loose and/or loosened particles to any extent can display a grain size which for most part will fall within the micro field and/or the nano field, such as formed by a polishing processing of a surface 2a.

(61) An air permeable substrate 40, inter alia in the form of a piece of flexible sheet material 41 and a support layer 42, is adapted to be continuously movable in relation to the said surface parts 2c, 2c, whereby a cleansing of particles P2, p2, collected within the piece of flexible sheet material 41, can take place using an underpressure, acting on a first side of the piece of flexible sheet material, in order to, via generated air streams, suck up and within the piece of flexible sheet material collect the loose particles.

(62) A cleansing of particles collected within the piece of flexible sheet material 41 can take place via an overpressure acting on the opposite side of the piece of flexible sheet material, in order to, via generated air streams and air jets, blow away particles concentrated within the piece of flexible sheet material, and wherein the flexible sheet material 41 and its supporting support layer 42 are both associated with adapted air permeable properties with different structures.

(63) When it comes to the arrangement 20, it is illustrated that the substrate 40 is to be formed as an endless strip, driven by a motor 32 and with a selected direction of motion along or against a direction of motion for a sheet 2 associated with the surface parts 2c, 2c, and that said surface is the subject of a polishing treatment and a deionization of these treated surface parts 2c, 2c before a cleaning from particles can take place.

(64) For the arrangement 20, it is proposed that a charging or ionization electrode 33 acting on the substrate 40 is to be located before the particle collecting surface part 40a, when this surface part by the driving will pass over and along the surface parts 2c, 2c intended for the particle collection, and each surface part there between.

(65) A breaking roll 21, arranged for driving the substrate 40, and/or other breaking rolls 21a, 21b, are shaped or affected to center the direction of motion of the substrate 40.

(66) A discharging- or deionization electrode 34 is oriented adjacent to the surface part 2c which has been cleaned from particles, and located in the direction of motion of the substrate 40, in relation to and after the surface part 2c.

(67) Adjacent to the electrode 34 there is a particle collecting ramp 35, with an integratedly formed deionization electrode 34, according to FIG. 5.

(68) According to the teachings of the invention, the substrate should be shaped as an endless strip 40, 40, 40a, 40, driven by a motor 32 (not shown), with a direction of motion which is counter-directed in relation to a direction of motion for the sheet 2 associated with surfaces 2c, 2c, and where the said surfaces 2c, 2c, with their particles, can be subjected to a deionization function 34a, before the electrostatic cleaning takes place from remaining small particles p2.

(69) A breaking roll 21, adapted for driving the substrate 40 and driving the strip 40, 40, cooperates with the support layer with a straight surface part 40a, arranged to collect particles under an electric field strength 70, shaped with a horizontal extension between a breaking roll 21 and a breaking roll 21a, and where a particle-free strip 40 is linked over via an upper breaking roll 21b, where the latter primarily is to be shaped or influensable for centering the different parts of the strip 40 with collected particles p2, so that the strip is linked over via a breaking roll 21a and a breaking roll 21b, where the latter primarily is to be shaped or influensable for centering the direction of motion of the strip 40, 40, 40a, 40.

(70) A deionization electrode 34b for a discharging of the sheet 2 is located, against the direction of transport for the strip 40, after the particle collecting surface parts 2c, 2c have passed the arrangement 20.

(71) FIG. 4 schematically shows a coupling arrangement adapted to constitute a piece of electric, such as a control- or supervisory, equipment S1, arranged to control and supervise the individual ionization degrees of one or several charging- or ionizing electrodes 33 and the efficiency of one or several discharging- or deionization electrodes 34, while considering a number of selected control criteria, which electrodes are controllable for creating a maximized technical particle collecting effect with a minimum electric power.

(72) Here it is shown that a feeding voltage U1 is to be trans-formed, via a transforming circuit S2, to a voltage controlling circuit Ur, and to a current controlling circuit Ir.

(73) Via an alternating current transforming circuit S3, the deionization effect of the deionization electrodes 34 is controllable.

(74) It is here to be noted that the criteria which may come into use for this control within the control equipment S1 are according to the following: Sense or calculate the instantaneous magnitude of the instantaneous ionization and/or the electrostatic field strength. For this purpose, sense and/or calculate instantaneous current- and direct-current voltage values. Sense and control measured direct-current power, for each of the used ionization electrodes (33). Consider selected transport velocity for the substrate (40). Control selected parameters depending on prevailing and selected temperatures. Consider and control current atmospheric humidity. Consider the criteria which depend upon the constructions and/or the density of the piece of flexible microfiber- or nanofibre sheet material. Consider the criteria that depend upon the electrically isolating properties of the substrate and/or the piece of flexible sheet material, inter alia the decay time of the field strength, the relative capacitance of the substrate.

(75) FIG. 5 shows and describes a part of an arrangement 20, namely the part to receive a particle collected and stored substrate 40 with its piece of flexible sheet material 41 and with a discharging- or deionization electrode 34, oriented in a selected direction of transport for the substrate 40 and its strip 40, before a unit 35 arranged to cleanse the substrate and the piece of flexible sheet material from concentrated particles P2, p2, which unit is here structured as a particle cleansing and particle collecting unit or a ramp 35.

(76) FIG. 6 shows, in a heavily enlarged plan view, a support layer 42, in the form of a right-angled grid structure, illustrating its quadratic openings 42b and the threads 42c, 42c surrounding the openings.

(77) The selection of the size of the openings 42b and the shape and dimension of the threads 42c, 42c will create the initially described relation.

(78) FIG. 7 illustrates, in heavy enlargement and simplified, two threads 61, 62 built up as micro- or nano structures, that have been treated in a known way to form micro structure or nano structure bundles of straws 61a, 62a, but where the shown illustration can be considered to be strongly schematic and where the free end parts 61b, 62b of the shown micro- or nano straws are oriented in immediate adjacency to and somewhat dragging along and above, however not in contact with, the surface parts 2c, 40a, 2c on which the loose particles P2, p2 exist.

(79) The distance d1 between the surfaces 61b and 62b and the surface part 2c should be dimensioned to be between 2 and 10 mm, and should normally not be in direct contact with the surface 2c, but it is within the scope of the invention for this distance to be as small as practically possible, as a smaller distance d1 generates stronger attractive forces from the applied electrostatic field strength 70 than what is achieved with a larger distance.

(80) Since the piece of flexible sheet material 41 and the support layer 42 are air permeable, it is within the scope of the invention to, using a vacuum cleaner 4 supplement the particle collection from the surface parts 2c, 2c.

(81) Decreasing, Such as Decaying, Electrostatic Field in FIG. 8.

(82) Even if the present invention is in no way directly related to the variation over time (t) (x-axis) of the electrostatic field strength 70, which is indicated as a decaying field strength in FIG. 8, the principal function of the invention will be described.

(83) In FIG. 2 has been introduced as reference numbers F1, F2, F3, F3, and F4, to various field strengths of the different part sections 40, 40a, 40 of the substrate, and these have also been introduced into FIG. 8.

(84) Hence, it is clear from FIG. 8 that at the point in time t0, a maximized field strength prevails from the ionization electrode 33. This field strength decreases, according to a decaying function, to the breaking wheel 21 and there also gives rise to a field strength of F2.

(85) This field strength F2 is additionally reduced along the section 40a to the value F3, under which the parts 2c to 2c are cleansed from loose particles p2 during the time duration between t1 and t2. This equals the time that the strip part 40a will pass between the breaking rolls 21 and 21a.

(86) At the time section t3, the substrate 40 is deionized and forms a deionized and cleansed substrate 40, which via a renewed ionization of the ionization electrode 33 is prepared for a renewed particle collection along the surface parts 2c and 2c.

(87) Practical tests tend to show efficient collection of loose particles p2 from surface parts 2c to 2c at a varying field strength, which can be achieved via different measures but most simply by allowing the variation to follow a decaying function, illustrated in FIG. 8.

(88) Naturally, the invention is not limited to the above, for exemplifying purposes disclosed, embodiment, but can be modified within the scope of the basic idea of the invention, which is illustrated in the enclosed claims.

(89) In particular, it should be considered that each shown unit and/or circuit can be combined with every other shown unit and/or circuit within the scope for reaching a desired technical function.