EP2686480A2 - Laminiertes endlosband - Google Patents
Laminiertes endlosbandInfo
- Publication number
- EP2686480A2 EP2686480A2 EP12709599.0A EP12709599A EP2686480A2 EP 2686480 A2 EP2686480 A2 EP 2686480A2 EP 12709599 A EP12709599 A EP 12709599A EP 2686480 A2 EP2686480 A2 EP 2686480A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- film
- shaped
- bands
- layer
- layers
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000004744 fabric Substances 0.000 claims abstract description 53
- 239000000463 material Substances 0.000 claims description 25
- 238000000034 method Methods 0.000 claims description 21
- 238000000576 coating method Methods 0.000 claims description 17
- 239000011248 coating agent Substances 0.000 claims description 16
- 229920000642 polymer Polymers 0.000 claims description 16
- 238000004519 manufacturing process Methods 0.000 claims description 13
- 238000002844 melting Methods 0.000 claims description 10
- 230000008018 melting Effects 0.000 claims description 9
- 229920000139 polyethylene terephthalate Polymers 0.000 claims description 8
- 239000005020 polyethylene terephthalate Substances 0.000 claims description 8
- 239000004952 Polyamide Substances 0.000 claims description 7
- 229920002647 polyamide Polymers 0.000 claims description 7
- 239000004696 Poly ether ether ketone Substances 0.000 claims description 6
- 239000004734 Polyphenylene sulfide Substances 0.000 claims description 6
- 239000000654 additive Substances 0.000 claims description 6
- 229920002530 polyetherether ketone Polymers 0.000 claims description 6
- 229920000069 polyphenylene sulfide Polymers 0.000 claims description 6
- -1 polyethylene terephthalate Polymers 0.000 claims description 4
- 239000011112 polyethylene naphthalate Substances 0.000 claims description 3
- 229920000098 polyolefin Polymers 0.000 claims description 3
- 230000001678 irradiating effect Effects 0.000 claims 1
- 239000010410 layer Substances 0.000 description 77
- 239000011265 semifinished product Substances 0.000 description 32
- 238000003466 welding Methods 0.000 description 24
- 239000000123 paper Substances 0.000 description 23
- 239000006096 absorbing agent Substances 0.000 description 7
- 239000010408 film Substances 0.000 description 7
- 230000035699 permeability Effects 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 239000000725 suspension Substances 0.000 description 5
- 239000000758 substrate Substances 0.000 description 4
- 238000005299 abrasion Methods 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000002759 woven fabric Substances 0.000 description 3
- 239000004831 Hot glue Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 239000004745 nonwoven fabric Substances 0.000 description 2
- 239000013047 polymeric layer Substances 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 239000011343 solid material Substances 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000001154 acute effect Effects 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 229920005570 flexible polymer Polymers 0.000 description 1
- 230000009477 glass transition Effects 0.000 description 1
- 230000012447 hatching Effects 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 230000031700 light absorption Effects 0.000 description 1
- 229920006254 polymer film Polymers 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 239000002243 precursor Substances 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F1/00—Wet end of machines for making continuous webs of paper
- D21F1/0027—Screen-cloths
- D21F1/0036—Multi-layer screen-cloths
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F1/00—Wet end of machines for making continuous webs of paper
- D21F1/66—Pulp catching, de-watering, or recovering; Re-use of pulp-water
- D21F1/80—Pulp catching, de-watering, or recovering; Re-use of pulp-water using endless screening belts
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F1/00—Wet end of machines for making continuous webs of paper
- D21F1/0027—Screen-cloths
- D21F1/0054—Seams thereof
Definitions
- the present invention relates to fabrics for paper machines and more particularly relates to non-woven fabrics and their manufacture.
- Paper machines are used to produce nonwoven webs such as papers of various types, cartons, cardboard and similar nonwovens.
- the term "paper” is used herein to represent these types of nonwoven fibrous webs.
- the production of a nonwoven web begins in the Formierpartie a paper machine with the application of a pulp suspension on a fabric or with the introduction of a pulp suspension in the gap formed between two fabrics.
- Coverings are usually designed in the form of endless belts, which are deflected via rollers and in each case circulate within a specific section or section of the paper machine.
- the paper-side surface of the fabric carries the pulp suspension or the resultant by dewatering pulp or nonwoven web.
- the guided over the rollers surface of the fabric is hereinafter referred to as the running side.
- the coverings have passages through which water can be sucked from the paper-side surface to the running side.
- the fabrics currently used as forming fabrics in the forming section of paper machines consist of woven material.
- Woven fabrics have regular structures with a repeating basic pattern.
- the forming fabrics are usually constructed of several layers of different thread thickness and yarn guide. Because of their different weave structure, the individual layers of such fabrics not only differ from each other in permeability to water, but also cause lateral local variations in the permeability of the layer, as apertures formed in the paper side layers are regularly obscured by yarns of underlying web layers Forming fabric. Since a laterally varying permeability leads to a locally varying dewatering speed of the fibrous web, visible markings of the paper web with a regular pattern following the weave pattern result. In addition, since lower dewatered areas of a paper web also have a lower fiber density, lateral permeability fluctuations also impair the paper quality achieved by this effect.
- Woven fabrics have a low flexural rigidity and therefore often tend to wrinkle during circulation in paper machines.
- the use of monofilaments of different materials such.
- strings can not be woven as an endless belt, the two ends of a finite length of woven tape must be joined together to form an endless belt.
- the connection is made via a complicated woven seam structure in which the ends of mutually associated ends of warp and weft yarns at the junction of the webbing are offset from each other by a certain pattern versplissen. This connection technique is very complex and is reflected in correspondingly high production costs for woven endless coverings.
- polymer tapes are used to produce coverings for paper machines, they must be stretched in the running direction of the fabric. Otherwise, the clothing is irreversibly stretched under the tensile stresses prevailing during operation and thus unusable after a short time.
- fabrics with widths of about eight to twelve and a half meters are currently commonly used.
- unidirectionally stretched polymer tapes are currently available only in widths of about one to about two meters. Biaxially stretched are currently offered to about four meters wide.
- several polymer tapes have to be laterally connected to each other.
- the ends of the band must be joined together. At theviersl. Jointing is reduced mechanical stability compared to solid material.
- a covering for use in paper machines is proposed, which is produced from a helically wound polymer tape.
- the width of the polymer strip is substantially less than the width of the fabric produced therefrom, the longitudinal direction of the polymer strip, with the exception of the inclined position given by the winding height, coinciding with the running direction of the fabric.
- the mutually opposite side edges of adjacent Windungs réelle of the polymer tape are welded together to form a closed tread. Since the weld seam at a relatively small angle to the direction of the Covering is arranged, the transverse to the weld portions of the tensile stress are low, so that the material in the region of the weld is ideally not charged excessively.
- the production of a covering from a helically laid polymer tape is very expensive, since it requires a special welding device in which either the welding apparatus with high precision along the welding line must be performed several times around the fabric around, or the covering with the circumferential weld line relative to Welding apparatus must be moved.
- the edges of the fabric must be trimmed after the welding process to obtain a uniform width stringing.
- the weld meets at an acute angle to one of the side edges of the fabric, which is due to the opposite to the polymer tape structurally weaker weld a point of attack for tearing of the fabric is given.
- a covering for paper machines which is designed in the form of a film, has a high mechanical stability and tensile strength, is sufficiently wide for use in industrially used paper machines, and which can be produced by conventional means.
- Embodiments of such fabrics for a paper machine are in the form of a closed loop in the circumferential direction, which has a first layer and a second layer disposed on the first layer, which is connected to the first layer over the entire surface, and wherein first and second layer each of a are formed film-shaped band or of a plurality, in the direction transverse to the direction of rotation juxtaposed and adjacent film-like bands.
- a foil-shaped band is to be understood as meaning a thin monolithic body of limited width compared to its lateral dimensions.
- the first and second layers are each formed by a plurality of film-shaped strips arranged next to one another and adjoining one another in the direction transverse to the direction of rotation.
- the film-like bands of the two layers are arranged so that adjacent side edges of two film-shaped bands one of two layers always between the side edges of a foil-shaped band of the other of the two layers, and adjacent end edges of foil-shaped bands of one of the two layers between the end edges of subsequent foil-like bands of the other of the two layers.
- a method comprising a step of providing a first film-like tape and a second film-like tape of equal or approximately equal length and width, at least one of the bands being transparent to light in a particular near infrared wavelength range.
- both bands are transparent to light in the particular near infrared wavelength range
- a coating is applied to one of the surfaces of one of the bands, the coating absorbing light of a wavelength from the particular wavelength range.
- the second film-shaped strip is arranged on the first film-shaped strip so that the two strips touch the optionally coated area.
- infrared light is irradiated by the or one of the transparent band-shaped bands transparent to the particular wavelength range to the region where both bands overlap, the wavelength range of the infrared light corresponding to a wavelength absorbable by the absorbing band or coating.
- the infrared light incident on the coating is moved relative to the bands arranged on top of each other such that each area of the contact area formed between the two bands is melted, while pressure is exerted simultaneously on the melting area.
- the second film-shaped tape is placed on the first film-shaped tape with a lateral offset, and if the first and second film-shaped are transparent to light in the particular wavelength range, preferably touch the two bands within the coated area.
- a plurality of the film-shaped tapes connected in accordance with the preceding steps are arranged side by side and adjacent to one another, and connected in a planar manner to an endless belt by analogous application of the preceding steps.
- Embodiments of the coverings comprise film-shaped strips of a polymer which is unidirectionally stretched in the circumferential direction of the covering or of a bi-directionally stretched polymer. As a result, a high dimensional stability of the fabric is achieved in the intended use.
- the foil-shaped bands of one of the two layers are connected in embodiments of the clothing with the foil-shaped bands of the other of the two layers cohesively.
- the tension occurring during intended use of the fabric tension is completely absorbed by the film-shaped substrate of the bands.
- adjoining side edges and / or adjoining end edges of the film-shaped bands are also connected to one another in a material-locking manner, so that no gaps can form at the edges.
- a cohesive connection is understood to mean a holding together of the connection partners by atomic or molecular forces.
- Embodiments of the fabric have a, applied to the paper-side surface of the first and second layer, third layer whose thickness is preferably smaller than that of the first layer, and also smaller than that of the second layer, so that on the one hand a smooth paper-side surface is created On the other hand, the water permeability of the fabric can be made laterally varying.
- Embodiments of the clothing can also have a, applied to the run-side surface of the first or second layer, fourth layer, the z. For example the circulation on the rolls of the paper machine is optimized.
- Third and / or fourth layer may each contain their material properties determining additives, wherein in embodiments thereof, the fourth layer preferably contains wear-reducing additives for reducing the abrasion of the fabric to the machine elements to achieve a longer life.
- the thickness of the covering in embodiments is preferably selected from the range of 300 to 1600 pm and in particular from the range of 500 to 800 pm.
- the film-shaped strips are formed in embodiments of the covering on the basis of a material comprising polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyphenylene sulfide (PPS), polyetheretherketones (PEEK), polyamide (PA) or polyolefins.
- PET polyethylene terephthalate
- PEN polyethylene naphthalate
- PPS polyphenylene sulfide
- PEEK polyetheretherketones
- PA polyamide
- PA polyolefins
- FIG. 1 shows a string designed as an endless band
- FIG. 2 shows a cross section through the endless belt of FIG. 1 along the
- Figure 3 is an assembled from individual parts endless belt
- Figure 4 is a schematic representation of a plan view
- FIG. 3 shows a schematic representation of a cross section through the semifinished product of Figure 4 shows a schematic representation of a plan view of another embodiment of a semifinished product for producing an endless belt of Figure 3 shows a schematic representation of an arrangement of semi-finished products for producing an endless belt in a plan view shows a shows a schematic representation of another arrangement of semifinished products for producing an endless belt in a plan view, a schematic representation of another arrangement of semi-finished products for producing an endless belt in a plan view shows a schematic representation of a comparison with the representation of Figure 9 modified arrangement of semi-finished products for producing a Endlosbands in a plan view shows a cross section through an endless belt made of semi-finished products with further layers illustrated in a schematic representation, an arrangement for welding two parts to a semi-finished in a schematic perspective view shows a holding device for receiving parts for the production of semi-finished products in a schematic perspective view shows an attached from a helical wound tape endless belt in a schematic representation, Figure 15 shows a perforated endless belt in
- the width of the endless belt 1 is limited by the side edges 2 and 3. In the direction parallel to the two side edges 2 and 3, the band 1 is self-contained and is therefore referred to as an endless belt.
- the direction in which the endless belt is closed in itself is referred to below as the running direction LR or circumferential direction LR of the band 1 or the clothing 10; the direction along the shortest connection between the two side edges 2 and 3 as the transverse direction QR.
- the fabric 10 has a paper-side surface 5, on which the pulp suspension or the fibrous web formed therefrom rests when the fabric 10 is used as intended.
- the paper-side surface 5 of the fabric 10 is the outwardly directed surface of the fabric 10.
- the inwardly directed surface facing the volume enclosed by the fabric 10 is referred to as the running side 6 in this document. It lies against the rollers (not shown in the figures), which cause the circulation of the clothing 10.
- the directions pointing from the running side to the paper-side surface of the clothing 10 are referred to below as the vertical direction of the clothing 10 or of the endless belt 1.
- the promotion of pulp suspension or fibrous web on the fabric 10 takes place in the machine direction MR on the paper side Surface 5 of the fabric 10.
- Figure 2 illustrates the structure of the endless belt 1 according to a first embodiment.
- the band comprises two layers arranged on top of each other, an inner layer 20 and an outer layer 30.
- the two layers are connected to one another at the contact surfaces.
- Each of the layers is single-layered, ie monolithic, with respect to the vertical direction of the endless belt 1, the thickness of each layer being substantially less than the length and width of the endless belt 1, so as to obtain a film-like configuration of the layers.
- the ends of each layer have each to each other, wherein the thus formed joint 31 of the outer layer 30 advantageously with respect to the running direction LR of the endless belt 1 offset from the joint formed in the same manner 21 of the inner layer 20 is arranged to the mechanical load of the individual joints 21 and 31 reduce the operational use of the fabric.
- the joints 21 and 31 are each shown as a double line to illustrate the juxtaposition of the two ends of each layer.
- this illustration is not intended to suggest that a gap is formed at the joints between the ends. Rather, the end faces of the ends abut each other directly and are preferably connected to one another in a material-locking manner.
- each of the layers 20 and 30 may be formed by one or more film-shaped bands that extend over the entire width of the endless belt 1 extend.
- the individual layers may be formed by a single film-shaped band 20 or 30, or by two or more film elements adjoining one another in the circumferential direction of the belt.
- each of the layers consists of a plurality of film-shaped parts 22 and 32, which are arranged side by side so that the side edges of adjacent parts adjacent to each other.
- a corresponding structure of an endless belt 1 is illustrated in FIG.
- the side edges of the individual parts 22 and 32 are preferably oriented parallel to the side edges 2 and 3 of the endless belt 1, so that the individual parts in the transverse direction QR, ie transverse to the direction of rotation of the endless belt 1, next to each other.
- the side edges of the outer layer 30 forming parts 32 are illustrated in the illustration of Figure 3 by solid lines, the inner layer 20 forming parts 22 by dashed lines.
- joints 31 of the individual parts 32 are offset in the embodiment shown in Figure 3 as well as the joints 21 of the individual parts 22 in the direction of rotation of the endless belt 1 to each other.
- this is not mandatory. Rather, all joints of a layer next to each other, ie with respect to the direction of rotation LR at the same height, be arranged, but the joints formed in one layer with respect to the circumferential direction of the band are always offset so arranged to those of the other layer that joints of different layers not are arranged one above the other in the vertical direction.
- joints of one layer with respect to the direction of rotation LR can then be arranged at the same height as joints of the other layer when they are spaced apart with respect to the transverse direction of the strip 1.
- two or more parts 32 and 22 may be arranged one behind the other in the direction of rotation LR.
- care must also be taken in such an embodiment that the joints in one of the layers do not adjoin abutments in the respective other layer. For multiple layers, it is recommended not to place a joint of a layer vertically above or below a joint of another layer.
- FIG. 4 shows a semi-finished product 29 for producing a composite of several parts 22 and 32 endless belt 1 in a plan view.
- FIG. 5 illustrates a cross-section through the semifinished product 29 of FIG. 4 along the line A-A.
- the semifinished product 29 shown consists of two parts 22 and 32 of the same length and the same width, which are arranged with a lateral offset from each other.
- the proportion of the lateral offset in the direction LR of the endless belt 1 is AL, in the transverse direction QR of the endless belt 1 AQ.
- the hidden by the part 32 edges of the underlying part 22 are in the representation of Figure 4 shown in phantom.
- the two parts 22 and 32 are integrally connected to one another at the contact or contact surface 39.
- the width of the parts 22 and 32 is preferably between about 10 cm and one meter. Preferred are widths of more than 30 cm and in particular more than 50 cm.
- the length of the band-shaped parts 22 and 32 is not limited and depends on the circumferential length of the endless belt 1 to be produced. Thicknesses in the range of 150 to 500 ⁇ m, and in particular around 300 ⁇ m, are preferred as material thicknesses, so that the parts 22 and 32 are in the form of films.
- the end edges 24 and 34 of the parts 22 and 32 are oriented parallel to the transverse direction QR of the endless belt 1 to be produced.
- the end edges extend at an angle of up to 45 ° obliquely to the transverse direction QR.
- a corresponding oblique position of the end edges can be provided not only with respect to the transverse direction QR, but also with respect to the vertical direction of the layers 20 and 30.
- the end edges of a part 22 and 32 are always arranged parallel to each other, the skew of the end edges of one part may differ from that of the other part. An example of this is shown in FIG. In this figure, the contact surface 39, to which the two parts 22 and 32 are integrally connected to each other, characterized by a dotted hatching.
- a plurality of semi-finished products 29 are placed against each other with their side edges 23 and 33 in such a way that a closed surface is formed both on the upper side and on the lower side of the arrangement. Subsequently, the contiguous surfaces of the parts 22 and 32, which are not already part of a contact surface 39, are bonded together in a material-locking manner.
- Figure 7 illustrates a suitably made band. The upper layer portions 32 are shown therein by solid lines, the lower layer portions 22 by dashed lines.
- the ends 24 and 34 of the parts are abutted one on the other before the areas of the parts 22 and 32 which are superimposed on one another are joined together.
- the Semi-finished products 29 are arranged offset in the direction LR to each other.
- the offset can be selected continuously as illustrated in FIG. 3 or alternately as illustrated in FIG. If the endless belt to be produced is longer than the parts 22 and 32 used for its production, then not only two or more semi-finished products in the transverse direction QR of the endless belt but also two or more semi-finished products in the direction of rotation LR of the endless belt are strung together.
- Figure 9 shows a possible embodiment of this. Of course, even in such embodiments in the transverse direction of QR adjacent semi-finished products can be arranged offset from one another in the direction LR.
- Figure 10 illustrates one of the possible embodiments thereof.
- a sheet-like substrate formed of thermoplastic resin based on, for example, polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyphenylene sulfide (PPS), polyether ether ketones (PEEK), polyamide (PA) or polyolefins is preferably used.
- the sheet substrate may be single-layered or, for. B. be carried out by coextrusion, multi-layered.
- additives can be added to the base materials, for example as protection against hydrolysis, for improving light stability and temperature resistance, or else for the formation of certain surface energies of the layer substrates for achieving hydrophobic or hydrophilic properties.
- sheet-like plates or rolls are produced by extrusion or casting of one of these materials, which are then unidirectionally stretched in the direction of LR or bidirectionally.
- the endless belt 1 may have further layers.
- another polymeric layer 40 may cover the layer 30.
- the run-side surface of the layer 20 may be covered with a further polymeric layer 50.
- a corresponding construction of an endless belt is illustrated in the cross-sectional view of FIG. 11.
- the Paper-side surface layer 40 is preferably thinner than layer 30 or 20 and is advantageously formed from a one-piece polymer film.
- the layer 40 covers joints formed at the side and front edges of the parts 22 and thus ensures a smooth paper-side surface of the fabric 10, when the parts 22 are not connected to each other at the joints and thus can open under the operational loads , Since the surface layer 40 does not have to absorb tensile stresses, the material of this layer can be selected with regard to optimized abrasion resistance.
- the run-side layer 50 may be provided to reduce the abrasion occurring during the passage of the various machine elements abrasion-reducing additives, whereby a higher mileage of the fabric 10 can be achieved.
- press section or dryer section 10 holes are placed in the endless belt, can be sucked through the paper-side surface on the running side of the fabric 10 water.
- the fabric 10 preferably has a total thickness or total thickness in the range of about 400 to 1 100 pm.
- total thicknesses in the range from about 500 pm to about 600 pm are preferred.
- parts 22 and 32 with material thicknesses in the range from about 200 to about 500 pm are used.
- the cohesive connection of two parts 22 and 32 on the contact surface 39 for producing a semifinished product 29 can be produced by ultrasonic welding, high frequency welding, thermal welding or gluing, in particular using hotmelt adhesives.
- the connection preferably takes place over the entire area, which includes both connections extending over the entire contact area and connections occupying only parts of the contact area. The latter are distributed over the contact surface so that the contacting surfaces are held together.
- the material bond between the two parts can be realized in the course of the formation of drainage pores using a laser drilling method described below. In this Method, the film material is melted at the edges of the pore holes, whereby at the contacting surfaces of the superimposed film parts 22 and 33, a material connection is created.
- the two parts 22 and 32 are connected to one another in a surface-active manner via a multiplicity of annular sealing regions surrounding the pores.
- a transmission laser welding method is used in which material is melted at the contact surface 39 by means of an NIR laser (laser with an emission wavelength in the near infrared range) while simultaneously applying pressure to the reflow region.
- NIR laser laser with an emission wavelength in the near infrared range
- At least one of the parts 22 or 32 is made of a material that is virtually non-absorbing the light emitted by the laser. If the other part consists of a material absorbing the laser light, then the laser light melts the surface irradiated on the contact surface 39, and can be adhesively bonded to the opposite surface of the other part by applying pressure.
- additives corresponding to the starting materials prior to extrusion or casting of the precursor used in the manufacture of one of the plates in the simplest case carbon black, may be incorporated.
- both parts are made of a material that does not absorb the laser light
- the surface of at least one of the parts 22 or 32 on the contact side is provided with a thin, laser-light-absorbing coating. It can also be the contact sides of both parts are coated.
- the absorber layer absorbs the light of the laser used for welding and thereby melts the adjacent surface areas of the two superimposed parts 22 and 32.
- the simultaneous application of pressure finally leads to a cohesive connection.
- Suitable lasers include, for example, diode lasers having emission wavelengths in the range of 808 to 980 nm and Nd: YAG lasers having an emission wavelength of 1064 nm.
- lasers with emissions in the range of 940 to 1064 nm are used.
- the schematic representation of Figure 12 shows an arrangement for surface welding of the two parts 22 and 32 at the contact surface 39.
- the radiated by a laser 60 fan-shaped light beam 61 is transparent to the wavelength used for a roller 63 by the material transparent to the laser light of upper part 32 linearly converges on the contact surface 39.
- the thus concentrated laser energy is absorbed at the contact surface 39 in the region of the line 62 and converted into thermal energy.
- the transparent roller presses with a predetermined force on the surface of the upper part 32, so that the two parts 32 and 22 are pressed together in the area around the line-shaped melting zone 62.
- the two parts in the area of the contact surface 39 are connected to one another over the entire surface and with a material fit.
- the method can be implemented both by moving the parts 22 and 23 received in a holding device and by the method of the irradiation arrangement.
- the absorber coating should be repeatedly applied either after welding the parts 22 and 32 to a semifinished product 29 on the remaining surface of the contact surface 39 of one of the parts 22 or 32, or if the surface before the welding at the contact surface 39 coated over the entire surface was, at least on the possibly melted edge areas around the contact surface 39th
- the lateral offset AQ in the transverse direction of the two bands 22 and 32 is preferably between 10 and 90% of the width of the bands in order to obtain sufficiently large areas for a durable connection of the two layers 20 and 30. Particularly preferred is an offset of about 50% of the part width, creating equal connections on both sides of the longitudinal edges are created. If the width of the bands 20 and 30 corresponds to the width of the endless band to be produced therefrom, no offset between the two bands is required.
- the lateral offset AL in the running direction of the two band-shaped parts 22 and 32 is analogously preferably between 5 and 95% of the part lengths, with an offset of about 50% being particularly preferred if the length of the parts 22 and 32 corresponds to the circumferential length of the endless belt 1 ,
- the side edges 23, 33, 24 and 34 of the semifinished products 29 are coated with an absorber layer before being juxtaposed.
- the fan-shaped laser beam 61 when connecting the semifinished product 29 to an endless belt 1 other than shown in Figure 12, not vertically, but obliquely directed to the surfaces of the semi-finished products 29, whereby a flat illumination of the side edges and thus a surface melting of the contact region of the side edges is achieved.
- the laser beam is preferably tilted both in the transverse direction QR and in the direction of travel LR, so that both the frontal edges 24 and 34 and the longitudinal edges 23 and 33 are welded.
- the side edges are pressed together by the pressure of the transparent roller 63 and thus securely connected. To ensure that the side edges of the lower layer are welded together, the process at the Bottom of the endless belt can be repeated.
- an absorber coating is preferably used which loses its infrared absorption capacity after the first reflow process.
- the side edges may also be formed obliquely to the vertical of an endless belt 1, as already mentioned above, and thus allow vertical irradiation.
- broadband radiators emitting broadband emitters for example quartz radiators, in the near infrared range from about 700 to 1200 nm.
- the wavelength range of the light directed to the welding regions is preferably matched to the absorber properties using filters.
- the side edges may also be welded using a monofilament, filled with a resin, or preferably joined with a hot melt adhesive, rather than with an IR laser or IR radiator. So that the edges of adjacent parts 22 and 32 directly adjoin one another in the production of an endless belt 1 from semi-finished products 29 as described, both the lateral dimensions of the individual parts 22 and 32 and the size and position of the contact surfaces 39 must be exactly the same for all semi-finished products , To ensure this, a holding device is advantageously used, in which the parts 22 and 32 are held in a fixed position relative to each other during the welding operation. An example of a corresponding holding device is shown schematically in FIG.
- the holding device 70 has two depressions 71 and 72, which are formed in the form of a negative mold of the semifinished product 29.
- the holding device 70 to the recesses 71 and 72 subsequent (not shown in the figure) recessed grips have.
- To protect the corners of the semifinished product 29 may be superimposed on the corners of the wells a hole.
- the dot-dashed arrow lines indicate in the figure, the insertion of the parts 22 and 32 in the holding device 70 at.
- the length of the belts 22 and 32 is a multiple of the circumferential length of the endless belt 1 to be produced therefrom.
- the two bands are connected to one another with a lateral offset.
- This can be done, for example, in a continuous process in which the two superimposed belts 22 and 32 are passed between two interacting rollers.
- One of the two rollers is the transparent roller 63 illustrated in FIG. 12, via which the laser light is introduced into the overlapping area of the two belts.
- the profiled strip produced is wound helically in such a way that the opposite side edges touch one another.
- the side edges are welded together, for example with a transmission laser welding method as described above, wherein the laser beam is preferably coupled at vertically formed side edges obliquely in the side edges.
- the edges of the endless belt 1 are also failed, that is, they are broken. H. cut or trimmed according to the desired width of the endless belt 1.
- the water permeability of the fabric 10 is, as shown schematically in Figure 15, set by introducing holes in the endless belt 1, for example by means of a laser drill.
- the number of holes 4 shown in the figure was chosen with a view to a clear presentation and corresponds as well as the size of the holes shown not the realities. In general, the holes 4 in about 100 pm to several hundred microns in size and also spaced in this order of magnitude.
- the covering does not run during operation, which is to be understood as a shortening of the circumferential length and width of the band 1 by thermal action, the covering is finally heat-set.
- the joints where local changes in the polymer structure can occur are distributed in such a way that they are always supported by regions with an unchanged polymer structure. This ensures that the tensile loads occurring during normal operation of the clothing are absorbed completely by the undisturbed regions of the clothing, whereby folds are avoided and a high longitudinal load of the clothing is achieved.
- FIG. 16 summarizes the essential steps of a method according to the invention for producing an endless belt 1 as described above.
- step SO first two film-shaped bands 22 and 32 of equal length and width are provided.
- the bands are for light in a certain wavelength range in the near infrared, i. H. within a range selected from the range of 800 to 1,100 nm, transparent.
- step S1 a coating is applied to a surface of one of the two belts 22 or 32. The coating absorbs light from the specific wavelength range.
- the second film-shaped tape 32 is arranged with a lateral offset on the first film-shaped tape 22 so that the two tapes touch within the coated area.
- step S3 laser light 61 is irradiated through one of the foil-shaped bands onto the coating in the overlapping region of the two bands, the wavelength of the laser light corresponding to a wavelength absorbable by the coating.
- the laser light irradiated onto the coating is moved in step S4 in such a way that each region of the contact surface 39 formed between the two bands 22 and 32 is melted while pressure is simultaneously exerted on the melting region.
- step S5 a plurality of the film-shaped bands connected in accordance with the preceding steps are arranged next to each other and adjacent to one another and are connected in area to an endless belt 1 by analogous application of steps S1 to S4.
Landscapes
- Laminated Bodies (AREA)
- Paper (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102011005673A DE102011005673A1 (de) | 2011-03-17 | 2011-03-17 | Laminiertes Endlosband |
| PCT/EP2012/054347 WO2012123439A2 (de) | 2011-03-17 | 2012-03-13 | Laminiertes endlosband |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2686480A2 true EP2686480A2 (de) | 2014-01-22 |
| EP2686480B1 EP2686480B1 (de) | 2015-03-04 |
Family
ID=45855767
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP12709599.0A Not-in-force EP2686480B1 (de) | 2011-03-17 | 2012-03-13 | Laminiertes endlosband |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US9309624B2 (de) |
| EP (1) | EP2686480B1 (de) |
| CN (1) | CN103429817B (de) |
| DE (1) | DE102011005673A1 (de) |
| WO (1) | WO2012123439A2 (de) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2688470A1 (en) | 2009-12-11 | 2011-06-11 | Allan Manninen | Industrial fabric comprised of selectively slit and embossed film |
| DE102011079517A1 (de) * | 2011-07-21 | 2013-01-24 | Voith Patent Gmbh | Gefügte Endlosbespannung |
| CN105473785B (zh) * | 2013-08-23 | 2017-11-17 | 福伊特专利有限公司 | 绷网和用于制造该绷网的方法 |
| EP3198076B1 (de) | 2014-09-25 | 2023-08-23 | Albany International Corp. | Mehrschichtiges band zum kreppen und strukturieren in einem tissueherstellungsverfahren |
| RU2687640C2 (ru) | 2014-09-25 | 2019-05-15 | Олбэни Интернешнл Корп. | Многослойная лента для крепирования и структурирования в процессе изготовления основанного на целлюлозе продукта |
| DE102018105433A1 (de) * | 2018-03-09 | 2019-09-12 | Voith Patent Gmbh | Verfahren zur Herstellung einer Grundstruktur für eine Papiermaschinenbespannung |
| DE102019117172A1 (de) * | 2019-06-26 | 2020-12-31 | Voith Patent Gmbh | Gewickelte Bespannung |
| US20220275580A1 (en) * | 2019-07-15 | 2022-09-01 | Voith Patent Gmbh | Paper machine clothing and method |
| CN115176055A (zh) * | 2020-02-27 | 2022-10-11 | 福伊特专利有限公司 | 造纸机网毯 |
Family Cites Families (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4541895A (en) | 1982-10-29 | 1985-09-17 | Scapa Inc. | Papermakers fabric of nonwoven layers in a laminated construction |
| SE468602B (sv) * | 1990-12-17 | 1993-02-15 | Albany Int Corp | Pressfilt samt saett att framstaella densamma |
| US5202170A (en) * | 1991-04-08 | 1993-04-13 | Wangner Systems Corporation | Papermaking felt with a non-spiralled machine direction fiber batt |
| US5864931A (en) * | 1991-05-23 | 1999-02-02 | Thomas Josef Heimbach Gmbh & Co. | Felt, in particular a papermaking-machine felt, and method for its manufacture |
| ES2175542T3 (es) * | 1997-02-27 | 2002-11-16 | Astenjohnson Inc | Fieltro de prensa de una maquina de fabricacion de papel cosido con presillas, multiaxial. |
| US6240608B1 (en) * | 1999-04-12 | 2001-06-05 | Albany International Corp. | Method for joining nonwoven mesh products |
| US6723208B1 (en) * | 2000-10-05 | 2004-04-20 | Albany International Corp. | Method for producing spiral wound paper machine clothing |
| GB0025514D0 (en) * | 2000-10-18 | 2000-11-29 | Voith Fabrics Heidenheim Gmbh | Papermachine clothing |
| US6565713B2 (en) * | 2001-02-03 | 2003-05-20 | Albany International Corp. | Laminated structure for paper machine press fabric and method making |
| US6790796B2 (en) * | 2001-10-05 | 2004-09-14 | Albany International Corp. | Nonwovens forming or conveying fabrics with enhanced surface roughness and texture |
| JP2004036046A (ja) * | 2002-07-04 | 2004-02-05 | Ichikawa Woolen Textile Co Ltd | 抄紙用プレスフェルト |
| US6875315B2 (en) * | 2002-12-19 | 2005-04-05 | Kimberly-Clark Worldwide, Inc. | Non-woven through air dryer and transfer fabrics for tissue making |
| GB0325463D0 (en) * | 2003-10-31 | 2003-12-03 | Voith Fabrics Patent Gmbh | Three dimensional tomographic fabric assembly |
| DE102008040973A1 (de) * | 2008-08-04 | 2010-02-11 | Voith Patent Gmbh | Verfahren zum Erzeugen eines Musters auf einem Endlosband |
| EP2376690B1 (de) * | 2008-12-12 | 2016-08-31 | Albany International Corp. | Technisches gewebe und verfahren zum herstellen |
-
2011
- 2011-03-17 DE DE102011005673A patent/DE102011005673A1/de not_active Ceased
-
2012
- 2012-03-13 CN CN201280013859.5A patent/CN103429817B/zh not_active Expired - Fee Related
- 2012-03-13 EP EP12709599.0A patent/EP2686480B1/de not_active Not-in-force
- 2012-03-13 WO PCT/EP2012/054347 patent/WO2012123439A2/de not_active Ceased
-
2013
- 2013-09-17 US US14/029,448 patent/US9309624B2/en not_active Expired - Fee Related
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2012123439A2 * |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2012123439A3 (de) | 2013-04-11 |
| EP2686480B1 (de) | 2015-03-04 |
| US9309624B2 (en) | 2016-04-12 |
| DE102011005673A1 (de) | 2012-09-20 |
| CN103429817B (zh) | 2016-05-18 |
| WO2012123439A2 (de) | 2012-09-20 |
| CN103429817A (zh) | 2013-12-04 |
| US20140014285A1 (en) | 2014-01-16 |
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