US3105789A

US3105789A - Baffle for paper machine

Info

Publication number: US3105789A
Application number: US105115A
Authority: US
Inventors: Denis A Goddard
Original assignee: Dominion Engineering Works Ltd
Current assignee: Dominion Engineering Works Ltd
Priority date: 1961-04-24
Filing date: 1961-04-24
Publication date: 1963-10-01
Anticipated expiration: 1980-10-01
Also published as: GB979981A

Description

Oct. 1, 1963, D. A. GODDARD BAFFLE FOR PAPER MACHINE 2 Sheets-Sheet 1 Filed April 24, 1961 \II l I I INVENTOR. DEZNlS A. GODDARD BY V 4,?

N UN.) NHEZQZHWDOh.

A TTOPNEY Oct. 1, 1963 D. A. GODDARD 3,

BAFFLE FOR PAPER MACHINE Filed April 24, 1961 2 Sheets-Sheet 2 ADJUSTABLE 4 3 END FIXINGS EE'PLACEABLE l9 WEAR STRIP FOAM PLASTIC,

STEEL. SKIN INVENTOR.

DEN IS A GODDARD ATTQENEY United States Patent "ice- 3,105,789 BAFFLE FOR PAPER MACHINE Denis A. Goddard, Como, Quebec, Canada, assignor to Dominion Engineering Works Limited Filed Apr. 24, 1961, Ser. No. 105,115 8 Claims. (Cl. 162-352) This invention relates to new and useful improvements in paper machinery and has particular reference to the provision of a new and improved baffie for a Fourdrinier type paper machine.

The object of the invention is to provide a light and rigid baffie structure for a paper machine wherein the ratio of stiffness to weight is very high.

Another object is to provide a baffle to which wear strips of various types may readily be attached.

Other objects and advantages of the invention will be apparent from the following description taken in connection with the accompanying claims.

Up to this time bafiies used on paper machines have been too heavy for convenient handling or, conversely, they have been too flexible for satisfactory functioning.

Baflles of conventional designs are subject to numerous disadvantages as follows:

(1) Excessive cost due to the amount of welding and the employment of expensive structural steel.

(2) Excessive handling weight resulting in damage to the baffle and/ or supporing members.

(3) Steel structures are deficient in internal damping and, therefore, tend to vibrate.

.(4) The mass of heavy baffles gives rise to undesirable accelerating forces in shaking-type Fourdriniers.

It is the principal object of this invention to provide a new and improved baffie which overcomes the disadvantages set forth above and which is relatively light weight yet rigid and which is relatively simple and economical to manufacture.

Referring to the drawings:

FIG. 1 is a schematic side view of a Fourdrinier paper machine embodying the invention;

FIG. 2 is a fragmentary sectional view taken on line 2-2 of FIG. 1, looking in the direction of the arrows; and

FIG. 3 is a fragmentary sectional view taken on line 3-3 of FIG. 2, looking in the direction of the arrows.

Referring more particularly to the drawings wherein similar reference characters designate corresponding parts throughout, the Fourdrinier paper machine shown embodying the invention includes the side beams 14 only one of which is shown and on which are mounted the table rolls 11, over which the Fourdrinier wire 12 runs, all in conventional manner.

On the side beams are provided the supports 13 having the adjustable end fixings 14 for supporting the trunnions 15 which are secured by welding or the like to each end of the bafiie indicated generally at 16 and which consists of a relatively light skin or casing 17 of steel or other suitable material. The baffle is provided with the reinforcement or strut 18 which provides rigidity and reinforcement to thereby assist in getting the loads in the skin 17 concentrated in the trunnions.

The baffle 16 is provided with the replaceable Wear strip 19 which is designed in accordance with the specific function of the baffle and may take any of various forms and may readily be changed. Adjustable end fixings 14 are provided having vertical, horizontal, and angular ranges of adjustment.

The baffle 16 is stabilized by being filled with foam plastic, the type of foam plastic employed is preferably polyurethane or other suitable material having the property of expanding when it polymerizes. The plastic is 3,165,789 Patented Oct. 1, 1963 introduced into the interior of the bafiie after welding and provides the internal pressure for pre-stressing the steel skin 17. This pre-stressing of the skin 17 and contact with the solidified foam, stabilizes the configuration of the baflle, so as to develop the full potential strength of the skin by prevention of local buckling.

I .Fluid under pressure could be employed to pre-stress the skin of the baffle but would not stabilize the skin against local buckling which the light solidified foam accomplishes effectively. I

In addition to lightness and rigidity other advantages of battles made in accordance with this invention are ease of handling and ease of adjustment and other advantages 'derive from the characteristically clean form of this construction and elimination of intolerable vibration.

In brief, the bathe comprises a light sheet steel casing which is filled with a foam plastic which has the effect of pro-stressing and stabilizing the sheet steel skin, providing a rigid structure with a very high stiffness to weight ratio.

Also, by fitting an appropriate type of wear strip, table roll baffles may retard the rate of drainage through the Fourdrinier wire, increase the rate of drainage through the Fourdrinier wire and prevent throwback of white water onto the underside of the Fourdrinier wire, or against adjacent table rolls.

From the foregoing it will be seen that I have provided new and improved means for obtaining all of the objects and advantages of the invention.

I claim:

1. A baffie for a Fourdrinier machine including, a relatively light weight skin, end plates and a trunnion secured to each end of said end plates for supporting said bafiie in operative position on the machine, reinforcement means within said skin for providing stability whereby external loads applied to said skin are transmitted to said trunnlions, said baffie being filled with a solidified plastic material for stabilizing said skin and preventing buckling thereof, said baffle having a longitudinal recess in its upper edge for receiving a wear strip.

2. A bafiie for a Fourdrinier machine including, a relatively light weight skin, end plates and a trunnion secured to each end of said end plates for supporting said baffle in operative position on the machine, reinforcement means within said skin for providing stability whereby external loads applied to said skin are transmitted to said trunnions, said baffle being filled with a solidified plastic material for pre-stressing said skin and preventing buckling thereof, said bafile having a longitudinal recess in its upper edge for receiving a wear strip.

3. A bafiie for a Fourdrinier machine including, a relatively light weight skin, end plates and a trunnion secured to each end of said end plates for supporting said baffle in operative position on the machine, reinforcement means Within said skin for providing stability whereby external loads applied to said skin are transmitted to said trunnions, said baffie being filled with a solidified plastic material for stabilizing said skin and preventing buckling thereof and adjustable end fixings for supporting said trunnions, said baffle having a longitudinal recess in its upper edge for receiving a wear strip.

4. A baffie for a Fourdrinier machine including, a rela- 5. A bathe for a Fourdrinier machine including, a relatively light weight skin, end plates and a trunnion secured to each end of said end plates for supporting said baflle in operative position on the machine, reinforcement means within said skin for providing stability whereby external loads applied to said skin are transmitted to said trunnions, said baflle being filled with a solidified plastic material for pre-stressing said skin and preventing buckling thereof, said bafile having a longitudinal recess in its upper edge and a replaceable Wear strip in said recess.

6. A baflle for a Fourdrinier machine including, a relatively light Weight skin, end plates and a trunnion secured to each end of said end plates for supporting said bafile in operative position on the machine, reinforcement means within said skin and connected to the opposite surfaces thereof for providing stability whereby eX- ternal loads applied to said skin are transmitted to said trunnions, said baflle being filled with a solidified plastic material for stabilizing said skin and preventing buckling thereof, said bafile having a longitudinal recess in its upper edge for receiving a Wear strip.

' 7. A bafii for a Fourdrinier machine including, a relatively light weight skin, end plates and a trunnion secured to each end of said end plates for supporting said bafiie in operative position on the machine, reinforcement means Within said skin for providing stability whereby external loads applied to said skin are transmitted to said trunnions, said bafile being filled with a solidified plastic material for pre-stressing said skin and preventing buckling thereof, said bafiie having a longitudinal recess in its upper edge and a replaceable wear strip in said recess applied to said skin are transmitted to said trunnions on the machine, said baflie being filled with a solidified plastic material for stabilizing said skin and preventing buck- 7 ling thereof, said bafile having a longitudinal recess in its upper edge for receiving a wear strip.

References Cited in the file of this patent UNITED STATES PATENTS 541,336 Savery Iune18, 1895 1,781,928 Liebeck Nov. 18, 1930 2,409,910 StOber Cd. 22, 1946 2,629,698 Sterling Feb. 24, 1953 2,718,824 Hornbostel Sept. 27, 1955 2,744,454 -Wage!ik1iecht May 8, 1956 2,767,461 Leb'oldeb al. Oct. 23, 1956 2,855,021 Hoppe Oct. 7, 1958 2,858,746 "Goodvvillie' NOV. 4, 1958 2,393,486 Mani July 7, 2,900,023 Hornbo'stel- Aug. ,18, 1959 2,928,465 Wrist Mar. 15, 1960 FOREIGN PATENTS I 561,716

Great Britain June 1, 1944

Claims

1. A BAFFLE FOR A FOURDRINIER MACHINE INCLUDING, A RELATIVELY LIGHT WEIGHT SKIN, END PLATES AND A TRUNNION SECURED TO EACH END OF SAID END PALTES FOR SUPPORTING SAID BAFFLE IN OPERATIVE POSITION ON THE MACHINE, REINFORCEMENT MEANS WITHIN SAID SKIN FOR PROVIDING STABILITY WHEREBY EXTERNAL LOADS APPLIED TO SAID SKIN ARE TRANSMITTED TO SAID TRUNNIONS, SAID BAFFLE BEING FILLED WITHA SOLIDIFIED PLASTIC MATERIAL FOR STABILIZING SAID SKIN AND PREVENTING BUCKLING THEREOF, SAID BAFFLE HAVING A LONGITUDINAL RECESS IN ITS UPPER EDGE FOR RECEIVING A WEAR STRIP.