US3695996A - Papermaking machine shaping cylinder having trapezoidal-shaped peripheral trough-like boxes - Google Patents

Papermaking machine shaping cylinder having trapezoidal-shaped peripheral trough-like boxes Download PDF

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Publication number
US3695996A
US3695996A US10853A US3695996DA US3695996A US 3695996 A US3695996 A US 3695996A US 10853 A US10853 A US 10853A US 3695996D A US3695996D A US 3695996DA US 3695996 A US3695996 A US 3695996A
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US
United States
Prior art keywords
cylinder
boxes
sheet
shaft
rings
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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.)
Expired - Lifetime
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US10853A
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English (en)
Inventor
Armando Frezzotti
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fibrostanpa Srl
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Fibrostampa Srl
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Publication date
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    • 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
    • D21F1/60—Cylinder moulds

Definitions

  • a papermaking machine shaping cylinder which includes a plurality of trapezoidal-shaped trough-like boxes at the periphery which are open to a wire mesh circumferentially disposed on the cylinder over the boxes.
  • the boxes are connected by rings to twin wheels spaced apart from one another, and which are themselves connected to the shaft of the cylinder.
  • Two distributor members are urged against openings in the rings so as to communicate either compressed air or vacuum to the interior of the boxes in a fashion to adher fibers from a slurry onto the wire mesh and then to transfer the formed fibrous sheet onto a felt contacting the cylinder.
  • a screw-threaded bush mounted on two aligned pins allows a displaceable segment of the cylinder periphery to move toward and away from the shaft to facilitate assembly and disassembly of the mesh.
  • This invention relates to an improvement in the shaping cylinders for the continuous machines used in the manufacture of paper, paperboards, nonwoven fabrics, asbestos-cement and the like.
  • the machines of the continuous type for paper manufacture comprise one or more manufacturing units, comprising a container to hold a suspension of fibres in water, and a hollow cylinder, which is partially dipped in the suspension and coated by a wire mesh or the like and is rotated about a horizontal axis.
  • the water in the container oozes through the meshes of the wire gauze or net, whereas the fibres stick thereto to form a thin layer.
  • Such a layer adheres to the lower surface of a collecting felt arranged tangentially with respect to said cylinder and adhering to a portion thereof, thrust thereagainst by a pressing or setting roller.
  • the sheet should exhibit no discontinuity, especially in a direction which is transversal to the drum.
  • An object of the invention is to provide a shaping cylinder by means of which it is possible to manufacture a continuous paper layer cut according to scripts, figures or drawings whatsoever.
  • a cut layer can be incorporated between two continuous layers, either of the same or of different colors, so as to obtain a watermark paper which can be of a color other than that of the sheet, or can be applied on a continuous layer, either alone or in combination with other cutout layers so as to obtain an end product composed by paper (or paperboard) reproducing the desired figures or symbols, in one or more colours.
  • a device wh ch consists, in combination, of a horizontal shaft carrying 3,695,996 Patented Oct. 3, 1972 at least two wheels staggered and integral with said shaft, at least two ring gears having radial openings afllxed to the periphery thereof, a set of boxlike compartments having a trapezoidal cross-sectional shape and arrayed the one alongside the others and integral with said ring gears, and arranged along the generating lines of the cylinder, with the larger base open and wrapped by a wire mesh, and the lesser base closed, a pair of holes formed at the ends of each boxlike compartment in registry with the openings of said rings, and a pair of fixed distributors which slide in a sealtight manner against the inner edge of said rings, so as to establish an air pressure or a negative pressure in the interior of said boxlike compartments, as a function of their position during the rotation of the cylinder.
  • Said distributors consist of two shoes in the form of arcs of a circle, having a set of radial chambers and supported by a rocker mounted idly on the cylinder shaft.
  • said radial chambers are formed, each, by a fitting for a duct which opens into a source of compressed air or of negative pressure, according to the position of the shoes aforementioned so as to cause the sheet fibres to adhere to said wire mesh and to cause the sheet to be released from the mesh, the result being the adhesion of the sheet to the collecting felt.
  • one or more portions of the wire mesh are coated with a varnish or the like, according to a preselected pattern, to prevent the formation of the fiber layer in that portion or portions so as to obtain a cut-out sheet according to the preselected patterns.
  • FIG. 1 is a front elevational view of the device, partly in section, along a plane perpendicular to the axis of rotation.
  • FIG. 2 is a side elevational view, in section along the Vertical plane passing through the axis of rotation.
  • FIG. 3 shows the detail of the removable sector.
  • FIGS. 4 and 5 shows the cross-sectional views, taken along the planes A-A and B-lB of FIG. 3.
  • the numeral 1 indicates the horizontal shaft, mounted for rotation in journals (not shown), which receives its rotary drive from any drive-transferring mechanism, or is directly driven by the collecting felt.
  • the shaft 1 dips in a manufacturing unit or tub containing a suspension of fibres in water whose outer level is shown at 2 in FIG. 1 whereas 2 is indicative of the inner level.
  • the shaft 1 To the shaft 1 are keyed two twin wheels 3, appropriately spaced apart from one another, to which are afiixed by screws 4 the circular rings 5 equipped with a set of radial openings 6 and integral with the front circle 7 having a rim 8.
  • the boxes 9 To the rings 5 are afiixed the boxes 9 having a trapezoidal cross-section, which are arranged according to the generating lines of the cylinder and mounted on said rings by the screws 10 and 11 (FIG. 5).
  • the boxes 9 are placed the one alongside the others (see also FIG. 3), and comprise the two sidewalls 12, the bottom wall 13 and the transversal sheet metal walls 14 whose outline is slightly arcuate.
  • the boxes. 9 are open at their tops and a mesh 15, formed by a wire mesh or another mesh of an appropriate material, is mounted taut thereon.
  • each distributor 16 is supported by a rocker 17 having a hub 18 mounted idly on the shaft 1 and is resiliently urged against said edge of the foraminous ring 5 by springs 19 located about the guiding posts 20.
  • the two arcuately shaped distributors 16 comprise segments 21 having sealing gaskets 22, between said segments a set of radial chambers 23 being formed, which communicate via first openings 23 with the openings 6 of the ring 5 and thus with the interior of the boxes or tubs 9 through the openings 35.
  • the radial chambers 23 of the distributor 16 have a second opening or fitting 24 for the connection with a source of compressed air or a vacuum source, as will be more detailedly set out hereinafter and as shown in FIG. 1.
  • a continuous collecting felt 25 is caused to slide tangentially and is pressed against the cylinder by a pressure roller 26.
  • the wheels 3 In order to facilitate the assembling and disassembling operations of the mesh 15, the wheels 3 have a sector 27 which can be displaced towards the centre of the cylinder by the agency of the screw-threaded bush 2.8 which is active against the pins 29. In order that such a displacement may be allowed (FIGS. 3 and 4) the set of boxes 9 encompassed by said sector have at their sides two sets of pins 30 carrying the tongues 31 aligned with the blades 14. The pins 30 are carried by the strips 32 having set screws 33. As seen in FIG. 4, the pins 30, as regards the portion concerning the ring 5, are directly screwed on the same ring. Alternatively, any appropriate sealing connecting means may be utilized here.
  • water sprays are provided, emerging from one or more sprinklers 34.
  • a special composite paper can be manufactured, since on the first shaping cylinder (either conventional or special) which forms a continuous sheet of the width of said cylinder, the sheet in question can be printed during the lamination with scripts or patterns which have been formed, either as a positive or negative image, on the mesh of the special cylinder.
  • the cutou sheet made by the special cylinder has a colour other than that of the sheet formed by the first cylinder, after the lamination a single sheet of paper is obtained, which has faces of different color but reproduces in one color only the letters, numerals or patterns reproduced on the mesh of the second shaping cylinder.
  • the gauze is punched to obtain a watermark and the punched portion is delimited by a varnish, one obtains, upon lamination, a sheet of paper which internally contains a water-mark whose color can be other than that of the remainder of the sheet.
  • the machine had three shaping cylinders, all three of the sucking and blowing type so that in the two lateral shaping cylinders the non-formation of the sheet is caused to coincide, the result would be a single watermarked sheet which could have, by properly coloring the batches, the watermarked sheet with a color different from that of the remainder of the sheet, well visible on the two surfaces.
  • a shaping cylinder for machines for manufacturing paper products comprising: a horizontal shaft; two wheels carried on said shaft and spaced apart from each other, each wheel having an arcuate displaceable segment radially movable toward and away from said shaft; two rings having radial openings fixed to the periphery of said wheels; a plurality of open trough-like members, having a trapezoidal cross section with the larger base open and smaller base closed, disposed one adjacent another on the circumference of and along the lines of generation of said cylinder, said trough-like members being connected at opposite ends to said rings; sealing means connecting a first group of said plurality of troughlike members disposed on said displaceable segment to the remaining plurality of trough-like members disposed on said cylinder; an opening defined in each end portion of said trough-like members in registry with said radial openings in said rings; a wire mesh circumferentially disposed on said cylinder over the open bases of said trough-like members; moving means for moving each said displaceable segment toward
  • a cylinder according to claim 1, wherein said movable means comprises a screw-threaded bush mounted on two aligned pins carried by said displaceable segment and a hub idly mounted on said shaft, respectively, to control displacement of said displaceable segment toward and away from said shaft.
  • a cylinder according to claim 1 further comprising a series of transversal blades carried by said plurality of trough-like members, said blades having an arcuate shape corresponding to the curvature of said cylinder wherein said mesh rests on said blades.
  • a cylinder according to claim 3, wherein said sealing means comprises two longitudinal strips having sealed gaskets.
  • a cylinder according to claim 4 wherein said 1ongitudinal connection strips include a set of pins having, at their upper ends, tongues which are aligned with said blades.

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  • Paper (AREA)
  • Saccharide Compounds (AREA)
  • Disintegrating Or Milling (AREA)
  • Making Paper Articles (AREA)
US10853A 1969-02-18 1970-02-12 Papermaking machine shaping cylinder having trapezoidal-shaped peripheral trough-like boxes Expired - Lifetime US3695996A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT3508469 1969-02-18

Publications (1)

Publication Number Publication Date
US3695996A true US3695996A (en) 1972-10-03

Family

ID=11241121

Family Applications (1)

Application Number Title Priority Date Filing Date
US10853A Expired - Lifetime US3695996A (en) 1969-02-18 1970-02-12 Papermaking machine shaping cylinder having trapezoidal-shaped peripheral trough-like boxes

Country Status (16)

Country Link
US (1) US3695996A (no)
AT (1) AT300541B (no)
BE (1) BE746106A (no)
CA (1) CA925338A (no)
CH (1) CH504581A (no)
CS (1) CS150504B2 (no)
DE (2) DE2006971C3 (no)
ES (1) ES376580A1 (no)
FI (1) FI57625C (no)
FR (1) FR2037387A5 (no)
NL (2) NL160896C (no)
NO (2) NO140075C (no)
PL (1) PL80864B1 (no)
SE (1) SE366076B (no)
SU (1) SU375858A3 (no)
YU (1) YU32573B (no)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4024015A (en) * 1972-12-07 1977-05-17 Valmet Oy Web-forming method and apparatus
US4162936A (en) * 1976-12-23 1979-07-31 Fibrostampa S.R.L. Washing device for impermeable areas of cylinder molds
US5244572A (en) * 1991-12-06 1993-09-14 Lavalley Industries, Inc. Rotary drum filter with improved deck structure

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4024015A (en) * 1972-12-07 1977-05-17 Valmet Oy Web-forming method and apparatus
US4162936A (en) * 1976-12-23 1979-07-31 Fibrostampa S.R.L. Washing device for impermeable areas of cylinder molds
US5244572A (en) * 1991-12-06 1993-09-14 Lavalley Industries, Inc. Rotary drum filter with improved deck structure

Also Published As

Publication number Publication date
YU32573B (en) 1975-02-28
DE7005390U (de) 1974-07-04
CA925338A (en) 1973-05-01
SU375858A3 (no) 1973-03-23
ES376580A1 (es) 1972-05-01
NO140075B (no) 1979-03-19
BE746106A (fr) 1970-07-31
CS150504B2 (no) 1973-09-04
SE366076B (no) 1974-04-08
CH504581A (it) 1971-03-15
FI57625B (fi) 1980-05-30
DE2006971C3 (de) 1974-04-04
AT300541B (de) 1972-07-25
NL160896C (nl) 1979-12-17
NL7906084A (nl) 1979-12-28
PL80864B1 (en) 1975-08-30
NO146246C (no) 1982-08-25
DE2006971B2 (de) 1973-09-13
DE2006971A1 (de) 1970-09-03
YU37870A (en) 1974-08-31
NO780829L (no) 1970-09-19
NL160896B (nl) 1979-07-16
FI57625C (fi) 1980-09-10
NL7002295A (no) 1970-08-20
FR2037387A5 (no) 1970-12-31
NO140075C (no) 1979-06-27
NO146246B (no) 1982-05-18

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