CA1085208A - Water-removal foils and to suction boxes covers for paper making machines and water-removal foils and suction boxes covers thus improved - Google Patents

Abstract

ABSTRACT OF THE DISCLOSURE

The disclosure herein pertains to an element for use in a paper-making machine utilizing as a running surface an element which includes a hard anti-wear member in combination with a support member made of a material different from the anti-wear member; an anchorage element is positioned between the support member and the hard anti-wear member and the anti-wear member is substantially encased in a resinous adhesive material whereby the anti-wear member contacts the anchorage element over only a minor area thereof.

Description

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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;

1(~8~2al8 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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l~B~Z~8 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 " ,:"
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.

1~352g~8 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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Claims (8)

The embodiments of the invention in which an exclu-sive property or privilege is claimed are defined as follows:

1. In an element for use in a paper-making machine utilizing as a running surface an element which includes a hard anti-wear member in combination with a support member made of a material different from said anti-wear member, the improvement including an anchorage element positioned between said support member and said hard anti-wear member, and said anti-wear member being substantially encased in a resinous adhesive material, whereby said anti-wear member contacts said anchorage element over only a minor area thereof.

2. The element of Claim 1, wherein the seat of the anchorage element is substantially vertical.

3. The element of Claim 1, wherein the seat of the anchorage element is substantially inclined.

4. The element of Claim 1, wherein the anchorage element has substantially the form of a U.

5. The element of Claim 1, wherein the anchorage element has substantially the form of a C.

6. The element of Claim 1, wherein the anti-wear member is sintered aluminium free of binders.

7. The element of Claim 1, wherein the said element is a water-removal foil.

8. The element of Claim 1, wherein the said element is a suction box cover.