WO1998042449A1 - Procede et dispositif pour appliquer une substance coulante - Google Patents

Procede et dispositif pour appliquer une substance coulante Download PDF

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Publication number
WO1998042449A1
WO1998042449A1 PCT/CH1998/000097 CH9800097W WO9842449A1 WO 1998042449 A1 WO1998042449 A1 WO 1998042449A1 CH 9800097 W CH9800097 W CH 9800097W WO 9842449 A1 WO9842449 A1 WO 9842449A1
Authority
WO
WIPO (PCT)
Prior art keywords
web
medium
gap
application heads
bead
Prior art date
Application number
PCT/CH1998/000097
Other languages
German (de)
English (en)
Inventor
Christian Strahm
Original Assignee
Solipat Ag
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Solipat Ag filed Critical Solipat Ag
Priority to AU60874/98A priority Critical patent/AU6087498A/en
Publication of WO1998042449A1 publication Critical patent/WO1998042449A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B05C11/02—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B05C11/10—Storage, supply or control of liquid or other fluent material; Recovery of excess liquid or other fluent material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B05C11/10—Storage, supply or control of liquid or other fluent material; Recovery of excess liquid or other fluent material
    • B05C11/1002—Means for controlling supply, i.e. flow or pressure, of liquid or other fluent material to the applying apparatus, e.g. valves
    • B05C11/1015—Means for controlling supply, i.e. flow or pressure, of liquid or other fluent material to the applying apparatus, e.g. valves responsive to a conditions of ambient medium or target, e.g. humidity, temperature ; responsive to position or movement of the coating head relative to the target
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B05C11/10—Storage, supply or control of liquid or other fluent material; Recovery of excess liquid or other fluent material
    • B05C11/1002—Means for controlling supply, i.e. flow or pressure, of liquid or other fluent material to the applying apparatus, e.g. valves
    • B05C11/1015—Means for controlling supply, i.e. flow or pressure, of liquid or other fluent material to the applying apparatus, e.g. valves responsive to a conditions of ambient medium or target, e.g. humidity, temperature ; responsive to position or movement of the coating head relative to the target
    • B05C11/1023—Means for controlling supply, i.e. flow or pressure, of liquid or other fluent material to the applying apparatus, e.g. valves responsive to a conditions of ambient medium or target, e.g. humidity, temperature ; responsive to position or movement of the coating head relative to the target responsive to velocity of target, e.g. to web advancement rate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
    • B05C5/02—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work
    • B05C5/0254—Coating heads with slot-shaped outlet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C9/00—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important
    • B05C9/04—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying liquid or other fluent material to opposite sides of the work
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K3/00—Apparatus or processes for manufacturing printed circuits
    • H05K3/02—Apparatus or processes for manufacturing printed circuits in which the conductive material is applied to the surface of the insulating support and is thereafter removed from such areas of the surface which are not intended for current conducting or shielding
    • H05K3/022—Processes for manufacturing precursors of printed circuits, i.e. copper-clad substrates

Definitions

  • the invention relates to a method and a device for applying a flowable medium with the features of the preamble of the independent claims.
  • prepregs are often used in particular in the electronics industry.
  • Flat structures made of fibrous substrates impregnated with curable resins are referred to as prepregs.
  • the not fully hardened impregnated sheets are laid together, pressed and completely hardened.
  • a fibrous substrate is impregnated with a hardenable resin system and then partially hardened.
  • the resin must be applied to a substrate, usually in the form of a continuous web, when producing prepreg.
  • the object of the invention is to avoid the disadvantages of the known, in particular to create a method and a device for applying a flowable medium to a web, which can be carried out in a simple and economical manner with curable systems (solvent-containing or solvent-free) . Furthermore, a method and a device are to be created with which a reliable impregnation of the material web can be achieved.
  • a flowable medium in particular a curable resin system
  • a web of a fibrous substrate is preferably used to produce prepreg.
  • This path is passed through a gap which is formed by two application heads.
  • the two application heads form an application unit for applying the medium to the web.
  • the gap tapers in the direction of travel of the web.
  • the application heads are provided with openings directed towards the gap through which the flowable medium is applied to the web can be.
  • the medium is fed through the application heads in a channel and injected onto the web in the openings.
  • the openings of the two application heads arranged on each side of the web preferably lie opposite one another.
  • the openings are expediently designed as slots approximately the width of the web.
  • the application heads can preferably be heated in a controlled manner. An optimal viscosity of the medium can thus be set.
  • a certain amount of the medium collects on the surface of the web. Depending on the flow rate of the medium and the forward speed of the web, a portion of the injected medium is taken up and removed from the web. If, based on the forward speed of the material web, a larger amount of medium is fed in than can be removed from the impregnated medium, a bead or a "template" of the medium forms in the area of the inlet of the gap widening against the direction of travel between the application heads. According to the invention, such a bead is produced in a targeted and controlled manner. Thanks to this bead, the medium is applied in a uniform thickness and essentially with the exclusion of air.
  • the width of the gap at the narrowest point is selected so that the surface of the application heads almost touches the web.
  • the application heads also act as a doctor blade, which determines the thickness of the applied layer. Thanks to this process, 2-component resins, 1-component resins or melt resins which are liquid under an elevated temperature can be used.
  • the application heads are also arranged so as to be rotatable about their longitudinal axis.
  • the longitudinal axis is parallel to Surface and understood approximately perpendicular to the direction of the web axis.
  • the two application heads can optionally be arranged individually or together in an adjustable manner.
  • Rotatable application heads are particularly advantageous in the case of application heads which have a surface with a non-uniform radius. Radius here means the distance of the surface from the axis of rotation.
  • the wedge angle of the gap between the application heads can be changed by turning the application heads. If the wedge angle changes, the hydraulic pressure of the medium on the web changes. The hydraulic pressure can be adjusted by turning the application heads depending on the penetrability of the web.
  • the size of the openings of the application heads is also adjustable.
  • the openings can be delimited by lips which can be moved by piezoelectric elements, adjusting screws or similar arrangements. With a variable cross-section of the openings, the outlet volume can be changed while the pressure of the medium remains the same.
  • the forward speed of the web and / or the flow speed of the medium are regulated in such a way that the size of the bead in the area of the widening inlet of the gap does not exceed or fall below predetermined target values.
  • the bead is optimized in such a way that the material can be used up again immediately and replaced with new material, that is to say cannot harden, and on the other hand a dwelling zone sufficient for complete impregnation is formed.
  • the flow rate of the medium and / or the forward speed of the web can be regulated during the measurement.
  • the measuring arrangement is preferably in operative connection with means for controlling the feed speed of the web and / or the flow speed of the medium.
  • An optical measuring arrangement for example a laser measuring device, is advantageously used.
  • the method according to the invention is particularly suitable for applying a hardenable melt resin system.
  • the melt resin is injected through the openings of the application heads at a temperature of preferably 20 ° C to 250 ° C, advantageously about 220 ° C.
  • the pressure of the medium depends on the porosity of the web. Typically pressures up to about 6 bar are used.
  • the device according to the invention for applying a flowable medium, in particular a hardenable melt resin system, to a web of a substrate essentially consists of two application heads.
  • the application heads together form a gap through which a web of material can be guided.
  • the application heads are each provided with at least one opening directed towards the gap.
  • the flowable medium can be applied through the openings to a web of material passed through the gap between the application heads.
  • the application heads can be heated in a controlled manner.
  • the width of the gap between the application heads increases continuously from the openings towards an inlet area in the opposite direction to the direction of travel of the material web.
  • the inlet area, in which the gap has a greater width, is designed to accommodate a bead of the flowable medium.
  • the gap at an outlet point is covered by two edges of the application heads. borders. The distance between the edges defines the order thickness for the medium on the web.
  • the application heads are arranged so as to be mutually displaceable in the running direction of the web.
  • a displaceable arrangement it is possible not to align the position of the openings for injecting the medium onto the web.
  • the medium is therefore first pressed onto the web from a first side and can penetrate it well due to the lack of back pressure.
  • the medium is then pressed from the opposite side onto the surface of the web. Due to the missing print on the first page, the medium can easily penetrate the web from the opposite side.
  • This arrangement leads to a particularly extensive impregnation / impregnation of the web.
  • the openings of the two application heads can also be advantageous to make the openings of the two application heads exactly aligned.
  • care must be taken to ensure that the web is not subjected to irregular forces.
  • An aligned arrangement of the openings of the two application heads causes a uniform application of pressure to the web and prevents curvature of the web, which could lead to warping of the web.
  • the device is provided with means for controlling the flow speed of the medium and / or the forward speed of the material web.
  • the size of the bead, which forms in the inlet area of the gap, can be controlled by changing the flow velocity of the medium and / or the advancement speed of the web.
  • the device can also be provided with a measuring arrangement for measuring the size of the bead in the lead-in area, which is advantageous is in operative connection with the means for controlling the flow speed of the medium and / or the forward speed of the web.
  • the measuring arrangement is advantageously an optical measuring arrangement.
  • a laser can be used.
  • FIG. 1 shows a schematic representation of the device according to the invention in cross section
  • FIG. 2 shows a special exemplary embodiment of the device shown in FIG. 1,
  • Figure 3 is an enlarged view of the device
  • Figure 4 is a schematic view of the guidance of a web through the device according to Figure 1, and
  • Figure 5 is a schematic representation of an alternative embodiment of an application head.
  • FIG. 1 shows a device 1 which essentially consists of two application heads 4a, 4b.
  • the application heads define a gap 5 through which a web 3 can be guided.
  • the gap tapers in the running direction L of the web 3 and has an inlet area 10 with a larger gap width and an outlet area 11 with a smaller gap width.
  • the application heads can be heated in a controlled manner with a heating arrangement, not shown.
  • the application heads 4a, 4b are provided with channels 13 through which the liquid medium M is directed towards the gap 5. directed openings 6a, 6b of the application heads 4a, 4b can be injected onto the web 3.
  • the liquid medium M is generally an epoxy.
  • the medium is injected onto the web at a temperature of 220 ° C. and a pressure of up to 6 bar in the area of the openings 6a, 6b.
  • the channels 13 are designed as slot nozzles that inject the medium M into the web 3 over the entire width of the fabric.
  • the flow rate F of the medium M and the forward speed V of the web 3 can be adjusted with control means 20, 21.
  • the flow speed F of the medium and the advance speed V of the web 3 are set such that a bulge 7 of the medium M results in the widening inlet area 10 of the gap 5.
  • the bead 7 partially fills the inlet area of the gap 5 and leads to the fact that the injection of the medium M onto the product web 3 takes place essentially with the exclusion of air.
  • the bead 7 is chosen small, so that there is a continuous renewal.
  • a schematically illustrated optical measuring arrangement 15 continuously measures the size of the bead 7.
  • the measuring arrangement 15 is in operative connection with the means 20, 21 for controlling the flow speed F of the medium and the forward speed V of the material web.
  • the flow rate F of the medium M is reduced. If the bead 7 is too small, the flow rate F is increased.
  • the advance speed V can also be reduced in order to enlarge the bead or it can be increased in order to reduce the bead.
  • the gap formed by the two application heads 4a, 4b is delimited in an outlet area 11 by two edges 12.
  • the edges 12 serve to precisely define the application thickness of the medium M on the web 3.
  • Figure 2 shows a slightly modified from Figure 1 Embodiment.
  • the application heads 4a, 4b are arranged so as to be mutually displaceable in the running direction L of the web 3 by means of a mechanical adjustment arrangement (not shown). The arrangement is selected such that the openings 6a, 6b of the application heads 4a, 4b are not aligned with one another.
  • the application head 4a is shown offset downwards in FIG.
  • the material web 3 is guided through the gap 5 formed between the application heads 4a, 4b.
  • the liquid medium M is injected from the left side. If there is no back pressure on the right-hand opposite side, the medium M can easily penetrate the web 3.
  • the web 3 already impregnated with the medium from the left is then passed in front of the opening 6b of the application head 4b, through which the medium M is injected onto the web 3 from the right side. At the location of the opening 6b there is no counter pressure on the left side, so that an optimal penetration of the web 3 can again be achieved.
  • FIG. 3 shows an enlarged representation of the area in which the medium M is injected onto the web 3.
  • the two application heads 4a, 4b are shown cut off.
  • the medium M is injected onto the material web 3 through the channels 13 and through the openings 6a, 6b directed towards the gap 5.
  • the gap 5 tapers in the running direction L and has a minimal width at the end of the screw-on heads 4a, 4b.
  • the minimum width is determined by the two edges 12 and essentially defines the application thickness of the medium M on the web.
  • the gap 5 widens against the running direction L of the web 3 and ends in an inlet area 10.
  • the flow rate F of the medium M and / or the forward speed V of the web 3 are selected such that a bead 7 is formed in the inlet area 10 in a controlled manner.
  • the bead 7 causes the medium M to be applied to the web 3 essentially with the exclusion of air.
  • the advance speed of the web is typically up to 100 m / min.
  • Epoxy resin is preferably used as the melt resin. However, it is also conceivable to use thermoplastics and thermosets.
  • FIG. 4 schematically shows a perspective illustration of a device 1 according to the invention.
  • the fabric web 3 is carried out on a treatment path between the two application heads 4a, 4b.
  • the medium M is applied to the web 3 through the openings 6a, 6b.
  • the application heads 4a, 4b and the openings extend approximately over the entire width of the web 3, so that it can be impregnated to the edge.
  • FIG. 5 shows an alternative embodiment of the application heads 4a, 4b.
  • the openings 6a, 6b are delimited by lips 25 which are arranged displaceably.
  • the arrangement for moving is not shown.
  • the lips 25 define the width of the outlet openings 6a, 6b and thus their cross section.
  • the application heads are also arranged to be rotatable about their longitudinal axis A. Because the radius R of the application heads 6a, 6b is not the same at different points on the surface 27, the wedge angle of the gap 5 can be changed by rotating the application heads 4a, 4b about the axis A.

Landscapes

  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

L'invention concerne un dispositif pour appliquer une substance coulante (M) sur une bande (3), ledit dispositif comprenant principalement deux têtes d'application (4a, 4b) qui présentent une fente (5) à travers laquelle la bande (3) peut être guidée. Les têtes d'application (4a, 4b) sont munies d'ouvertures (6a, 6b) orientées dans vers la bande (3), servant à appliquer la substance (M) sur ladite voie (3). La fente (5) s'élargit dans la direction opposée au sens de défilement (L) de la bande (3). Cet élargissement est conçu de telle sorte que la fente reçoive un bourrelet (7) de substance (M) dans une zone d'entrée (10). Selon le procédé de l'invention, la vitesse d'avance (V) de la bande de matière et/ou la vitesse d'écoulement (F) de la substance (M) sont régulées de sorte qu'un bourrelet contrôlé (7) de substance (M) se forme dans la zone d'entrée (10). Ce bourrelet (7) permet d'appliquer la substance (M) sur la bande de matière (3) pratiquement à l'abri de l'air.
PCT/CH1998/000097 1997-03-24 1998-03-10 Procede et dispositif pour appliquer une substance coulante WO1998042449A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU60874/98A AU6087498A (en) 1997-03-24 1998-03-10 Method and device for applying a flowable medium

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH0704/97 1997-03-24
CH70497 1997-03-24

Publications (1)

Publication Number Publication Date
WO1998042449A1 true WO1998042449A1 (fr) 1998-10-01

Family

ID=4193234

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CH1998/000097 WO1998042449A1 (fr) 1997-03-24 1998-03-10 Procede et dispositif pour appliquer une substance coulante

Country Status (2)

Country Link
AU (1) AU6087498A (fr)
WO (1) WO1998042449A1 (fr)

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2784697A (en) * 1952-12-16 1957-03-12 Enamelstrip Corp Apparatus for coating metallic strips
US3330961A (en) * 1964-04-15 1967-07-11 Eastman Kodak Co Photoelectric skip detector for use with a viscous layer applicator
FR2260395A1 (fr) * 1974-02-11 1975-09-05 Inventing Ab
US4063531A (en) * 1976-02-03 1977-12-20 Beloit Corporation Coater for both sides of traveling web
EP0016681A1 (fr) * 1979-03-14 1980-10-01 Centre Technique De L'industrie Des Papiers, Cartons Et Celluloses Procédé et dispositif pour l'enduction en continu d'un élément en feuille, notamment une bande de papier ou de carton
US4327130A (en) * 1978-02-23 1982-04-27 International Business Machines Corporation Method and apparatus for forming a coating on both sides of a substrate
FR2562816A1 (fr) * 1984-04-17 1985-10-18 Ahlstroem Oy Procede et dispositif pour appliquer un revetement sur une bande, notamment de papier
GB2171934A (en) * 1985-03-07 1986-09-10 Waertsilae Oy Ab Two-sided coating of paper webs
WO1994027739A1 (fr) * 1993-05-27 1994-12-08 Alcan International Limited Machine a revetir les deux faces de rubans et procede associe
US5558716A (en) * 1993-04-01 1996-09-24 Hirano Tecseed Co., Ltd. Coating machine with an adjustable nozzle and a pressure sensor

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2784697A (en) * 1952-12-16 1957-03-12 Enamelstrip Corp Apparatus for coating metallic strips
US3330961A (en) * 1964-04-15 1967-07-11 Eastman Kodak Co Photoelectric skip detector for use with a viscous layer applicator
FR2260395A1 (fr) * 1974-02-11 1975-09-05 Inventing Ab
US4063531A (en) * 1976-02-03 1977-12-20 Beloit Corporation Coater for both sides of traveling web
US4327130A (en) * 1978-02-23 1982-04-27 International Business Machines Corporation Method and apparatus for forming a coating on both sides of a substrate
EP0016681A1 (fr) * 1979-03-14 1980-10-01 Centre Technique De L'industrie Des Papiers, Cartons Et Celluloses Procédé et dispositif pour l'enduction en continu d'un élément en feuille, notamment une bande de papier ou de carton
FR2562816A1 (fr) * 1984-04-17 1985-10-18 Ahlstroem Oy Procede et dispositif pour appliquer un revetement sur une bande, notamment de papier
GB2171934A (en) * 1985-03-07 1986-09-10 Waertsilae Oy Ab Two-sided coating of paper webs
US5558716A (en) * 1993-04-01 1996-09-24 Hirano Tecseed Co., Ltd. Coating machine with an adjustable nozzle and a pressure sensor
WO1994027739A1 (fr) * 1993-05-27 1994-12-08 Alcan International Limited Machine a revetir les deux faces de rubans et procede associe

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Publication number Publication date
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