Note: Descriptions are shown in the official language in which they were submitted.
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The present disclosure relates to improvemen-ts to
water-removal foils and to covers of suction boxes in paper-
making machines. More particularly, the present invention
pertains to the running surfaces in the formation table, or
in other parts, of paper-making machines, on which runs the
wire made of hard material. Such surfaces are constituted by
the face of a segment made of hard material, such as ceramics
of a corundum base, or sintered aluminium without binders, for
example such as the type known commercially under the trade-
mark KORINDON.
The present invention concerns the application of ~-
this hard material to the body carrying the water-removal foils
and covers for these suction boxes.
The present invention also concerns water-removal ;~
foils and suction box covers adopting such improvements.
The water-removal foils and suction box covers,
which form the subject of the present invention, are utilized
in machines for the continuous production of paper and ;
generally in all cases dealing with a more or less pasty and
liquid sodden substance which is run over a surface constituted
of a net, or wires or other similar support surfaces, where at
least part of the liquid contained in the pasty substance is `
to be removed.
According to the present invention, the surfaces or
leading edges are obtained by placing shaped segments of
sintered pure aluminium, or of other hard material next to
each other and fixing the segments into a supporting body.
In accordance with another aspect of the present
invention, the anchorage of the hard material segment to the '~
supporting body of foils or the suction box covers is achieved
by glueing within a substantially U-shaped metallic element;
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this U-shaped element may be continuous, or it may include
interruptions, holes or slots, or other technical aspects
capable of giving a better connection between the glued
elements.
According to one perfected embodiment of the
invention, an U-shaped metallic element for the anchorage of
the anti-wear element of the water-removal foils and suction
box covers is obtained by connecting two shaped elements
having substantially an open L-form such as to form a channeL
suitable for housing the anti-wear element. The latter may -
have any shape, large or narrow; it may also be level or
inclined with respect to the wire movement.
This permits the application of inclined anti-wear
elements to the water removal foils and suction box covers
achieving thus a higher water removal rate and minor wire wear.
Furthermore, according to the invention, the part to
be glued or the hard material shaped element, may be partially
or totally provided with projections and dowellings.
In accordance with the invention, the hard material
shaped element is substantially detached from the U-shaped
metallic elements between which the glueing material is
interposed.
The present invention therefore relates to an -
improvement in an element for use in a paper-making machine
utilizing as a running surface an element which inaludes a
hard anti-wear member in combination with a support member
made of a material different from the anti-wear member; this
improvement includes an anchorage element positioned between
the support member and the hard anti-wear member; the anti-
wear member is substantially encased in a resinous adhesive
material whereby the anti-wear member contacts the anchorage
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element over only a minor area thereof.
With reference to the above, there will now be ~:
described by way of example one mode of realizing the present .
invention.
IN THE DRAWINGS:
Figures l to 7 illustrate various types of water
removal foils according to the present invention;
Figure 8 illustrates one type of suction box cover;
and
Figures 9 to 13 illustrate additional water-removal
foils.
With reference to the drawings, in which similar
parts or parts with similar functions carry similar references,
10 is generically the water-removal foils, 110 is generically
the suction box cover while 28 is the suction box itself; 11
is the support body of the water-removal foil, obtained by
casting in resin or from resin section, preferably poly-
ethylene; 12 is an example of an internal core made of metal
for stiffening the foil 10 as well as an insertable element .:
121; core 12 can also assume the function of sustaining the
fixture means 15; 13, 113 and 213 is the hard material
segments, advantageously constituted of sintered aluminium
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oxide ceramic wit:hout binders, such as the commercial type
known under the trade mark KORINDON, or any other suitable
material; element 13 is preferably shaped to include an
anchorage heel 24 and a running surface 17 and a leading edge
18 and 118; 14, 114, 214 is the glueing resin, said resin may :
be the same forming the body 11, or may be a special resin for
glueing purposes only; 15, 115 are generically the fixture
means of the segment 13 to the water-removing foil 10, or to
the insertable element 121 or 221.
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Fixture means 15 are constituted in the example of
Figs. 1, 2, 3, 4 and 8 of an U-shaped element with short and
straight convergent or diveryent sides within which the heel
24 of the anti-wear element 13 is housed and glued; the heel
is not in contact with the fixture means 15 nor are the
projecting surfaces in contact thereto.
In Figs. 9 to 13, the fixture means 115 present a
configuration in the form of a "C" which englobe the heel 24
without coming into contact with it; these fixture means 115
may include a lateral base 27, as indicated below for the -~
fixture means 15.
In the example of Figs. 5, 6, 7, fixture means 15
also include a seat in the shape of a U suitable for housing
heel 24 of segment 13 and additionally a lateral base of
fixture 27, suitably orientated and dimensioned, for
sustaining the fixture means 15; said fixing can also be
achieved by welding or by screws (stay bolts, rivets) to the
internal core 12 as in Fig. 8, on support bars 30 and plates
130, to the external frame 29 of suction box covers 110;
screws may be used to fix the anchorage means 15 to the
internal core 12, or to other rigid material elements solid
to the water-removal foil 10 or to the suction box 110.
In Figs. 5, 6, 7, the fixture means are favourably
constituted by two extended sections superimposed on one side
and spaced on the other, forming thus the fixture base 27
with said superimposed sides. Fixture means 15-115 can also
be made in one piece or by bending a single piece, or by
mutually fixing a "C" or "U" shaped element to any other
piece. As shown in the drawings, the fixture and anchorage
may have a substantially vertical seat or a seat which is
substantially inclined.
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Point or points 16 is a possible reciprocal ~ixing
means between the fixture means and the internal core 12 or
with the element acting as an anchorage; 19 are some various
possible forms of anchorage of the foils 10 to the supports
or to the plane table of paper-making machines; 20 are
channels, or projections, that may be provided to all or part
of heel 24 of segment 13; 21 is an element englobing the
fixture means 15 and the internal core 12, said element may be
of the insertable type (as in Figs. 10 to 13) or made in one
piece including the support body 11; in both cases, the
support body 11 is provided with channels 22 and dowellings 23,
favourable to the adhesion and the reciprocal mechanical
joining; 24,124 is the heel of the anti-wear segment 13,113,
213; heel 24 may be straight and wide as in Figs. 1, 2, 3,
and 4 or inclined and narrow as in Figs. 5, 6, 7, 11 and 12;
it may have straight parallel sides or inclined with or
without dowellings; the heel may also be provided with upper
projections; 25 is a screw or rivet or other similar means
in the support body 11 and suitable for mechanically joining
the reciprocal parts; 26 is the upper running surface of
foil 10; 28 is the body of the suction box; 210 is the
cover of the suction box with a suction vacuum 31; 30 are
supports solid to the frame of the covers of the suction boxes
210 cooperating with plates 130; 32 are removable supports
which carry and sustain segments 113 made of hard material,
33,133 is the seat in which the elements 121,221 are inserted;
34 is the inclination axis of seat 33.
The body 11 of the water-removal foils may be
obtained from one single type of resin, possibly with the -
help of differentiated resin as in Figs. 3, 5 and 7, or it
may be a metallic support 111 to which is fixed mechanically
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the upper body 211 by screws, rivets or others 25 (Fl~. 7);
the upper body 211 may also be resined to the support 111.
The body 114 can also include an anti-wear hard-
facing 211 on the rear running surface 26; this hard-facing
may be in resin, metal of hard material as in Figs. 9 to 10
in which anti-wear facing is constituted of an insert 221.
The rear running surface 26 may be lowered at a
tangent to the anti-wear segment 13, or it may be lower in
a stepped way relative to the anti-wear segment 13 (Fig. 6).
The fixture means 15 may be welded, spot-welded ,
rivetted or glued to core 12, these fixture means may be '~
continuous or can be formed of elements placed side by-side.
The fixture means 15 could also include holes, lightening
slots, scores, and sunk or projecting edges, in order to
improve the mutual holding.
Some illustrative embodiments have been described
herein; nevertheless other embodiments are possible; thus ~-
dimensions, forms and proportions can be varied. The forms
and types of foils can be changed as well as that of the
support and internal core; the types of anchorage to the
machine can be modified; insertable or removable intermediate
elements can be provided and complete support elements can be
envisaged.
Thus the whole including the fixture means 15 and
the internal core 12 partially incorporated in the resin 21
may be slidingly inserted in support body 11 of the foils 10
or by mechanical coupling of the parts, etc.
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