US2876684A

US2876684A - Head box

Info

Publication number: US2876684A
Application number: US638616A
Authority: US
Inventors: James J Fusco
Original assignee: Sandy Hill Iron and Brass Works
Current assignee: Sandy Hill Iron and Brass Works
Priority date: 1957-02-06
Filing date: 1957-02-06
Publication date: 1959-03-10
Anticipated expiration: 1976-03-10

Description

HEAD Box Filed Feb. e, 1957 Match 10, 1959 INVENToR.

United States Patent O F HEAD Box James J. Fusco, Glens Falls, N. Y., assignor to The Sandy Hill Iron & Brass Works, Hudson Falls, N. Y., a corporation Application February 6, 1957, Serial No. 638,616

3 Claims. (Cl. 92--44) This invention relates to new and useful improvements in paper making machines and is `directed more particularly to improvements in a head-box construction for such machines. .t

The principal objects of the invention are directed to the provision of a novel head-box construction characterized by means to maintain a predetermined head, to obviate ilocculation, and to facilitate the forming of a sheet of a more uniform caliper.

According to specialI features of the invention, a predetermined head is automatically maintained or controlled accordingly as the volume of stock delivered thereto may uctuate due to the operation of the stock supplying means, such as a pump or the like, while the level or head of-stock mayybe' varied depending on the characteristics of stock, velocity of discharge, and other variables.

To obviate flocculation and other objectionable conditions of operation, the head-box is formed for upward stock flow, with a relatively high stock pond, and with a flow of stock from the pond at intervals upwardly therealong all without affecting the head. Stock flowing from the pond at intervals is returned or recirculated to the source of stock supply.

According to the novel arrangement of the head-box, stock flowsnpwardly therein, and is discharged at its lower portion in the normal way. Automatic means associated with the lower portion of the head-box provides for a controlled flow of stock` from the head-box, accordingly as the stock supply fluctuates from a predetermined volume, thereby to maintain a predetermined head. Means spaced upwardly of the headbox provides a controlled flow of stock from the headbox without affecting the predetermined head. In this way, there is constant stock flow upwardly into and through the head-box and outwardly therefrom resulting in stock recirculation, without objectionably affecting stock discharge or the head, and, at the same time, functioning for the formation of a sheet of more uniform caliper, and overcoming ilocculation and other objectionable conditions.

While the novel features of the invention will be described in the form at present preferred, in connection with the wire of a Fourdrinier paper machine, it will be understood that the head-box construction of the invention may be used with various types of machines.

In the following description and claims, various details will be identified by specific names for convenience. These names however are intended to be as generic in their application as the art will permit.

Various changes and modifications may be made in the form of the apparatus, within the spirit and scope of the invention, to adapt the apparatus for various uses, and therefor it is desired to be limited, if at all, by the appended claims, rather than the following description and drawings wherein:

Fig. 1 is a rear elevational view, more or less dia- 2,876,684 Patented Mar. '10, 1959 ICC.

grammatic, of a head-box construction, embodying the novel features of the invention; and

Fig. 2 is a vertical sectional view through the headbox construction shown in Fig. 1.

Referring now to the drawings more in detail, the novel features of the invention will be fully described.

The head-box construction 2 of the invention is generally formed by vertically extending rear and forward walls 4 and 6 respectively which are connected at opposite vertical sides by end walls 8.

A lower slice member 10 extends forwardly from rthe forward wall and an apron 12 is disposed therebelow. An outer lip 14 of the slice is adjustable in the usual manner by threaded` jack screws, such as 16, which are connected at lower ends to the lip 14. The screws extend through brackets, such as 18, which are secured to the head-box. Manually engageable wheels or nuts 20 are engaged with the screws 16. By rotating the nuts in one direction or the other, the lip 14 is adjustable to provide a predetermined outlet 22 for the discharge of stock from the head-box. A breast-roll is represented by 24, which would normally support the Fourdrinier wire of a paper machine.

The outlet 22 will be adjusted to discharge stock at a predetermined velocity to the wire where the head-box is used in connection with a Fourdrinier machine, or as may be desired with other types of machines.

The head-box has a lower stock entrance portion. 28 and holy rolls 30, of well known form, may be provided for their usual function.

Stock may be delivered to` the entrance member 28 through any desired inlet construction which will be adapted to accomplish uniform stock distribution, longitudinally across the head-box. For illustrative purposes, for the intake of stock, an opening is represented by 32.

The inlet construction, not shown, connected to the entrance member 28, will be connected to a stock supply adapted to provide, as near as possible, a predetermined constant or uniform volume of stock, for a selected paper making operation. A portion 34 of the head-box rearwardly of the outlet 22, may be termed a chamber.

It will be noted that the forward and rear walls 6 and 4 are shown as extending vertically upwardly from the chamber in a generally diverging relation. The said walls are preferably arranged for a stock pond which is of relatively greater height than transverse width from front to back.`

In this way, it is possible to obtain a desired predetermined head which will be maintained. according to the invention.

Stock flows vertically upwardly providing the vertical pond and is returned or recirculated to the stock supply. To that end, a vertically extending conduit 40 is provided which is connected to a return 41 extending to the stock supply.

Headers

44, 46, 48 and 50, spaced vertically of the head-box, are provided and extend longitudinally of or across the head-box. Said headers are connected at intervals therealong with the head-box by a plurality of

connections

44', 46', 48 and 50.

The upper end 42 of conduit 40 is connected to the uppermost header 50, as shown.

Headers

46 and 48 have connections 52 and 54 respectively extending to the vertical conduit 40, and said connections have valves 52' and 54 respectively therein which, preferably, are manually operable. The header 44 is connected to the return by 56 and has a valve therein.

The valve 56 will be of the automatically operable type, and normally open, to some extent. This valve will be arranged to open and close to control the outflow of stock from the head-box to conduit 40 according to such variations in the head of stock in the pond as may result from slight uctuations or wanderings of the volume of stock as may occur, as stock is delivered from the stock supply to the lower end of the head-box.

The valve 56 may be operated by a float in the headbox or by means responsive to the pressure of stock in the head-box. The valve being normally open, there is a ow of stock from the chamber or lower portion of the head-box. The valve will be such as to open on rise of the head and close as the head lowers so as to maintain the head constant. The valves 52' and 54' will be open for the How of stock from the head-box to the conduit 40.

Thus there is a tlow of stock into and upwardly of the head-box. Stock is discharged from the outlet 22, but stock ows from the pond to the conduit through valve 56', and through valves 52 and 54', and through the upper connection 42, depending upon the level of stock.

The valves will be relatively adjusted for a desired predetermined head of stock and ow'of stoclf. from the head-box. With the upward ow of stock, llocculation and other undesirable operating conditions are obviated. At the same time, there is eiiicient stock recirculation. By reason of the plural connections from the head-box, such as 44', 46', 48 and 56', there is a uniform distribution of fibers longitudinally or acrossthe head-box. Altogether it istpossible to form a sheet of more uniform caliper and generally desirable characteristics, there being no possibility of settling of fibers, bunching or clumping thereof, or other conditions which commonly unfavorably influence sheet formation.

While the apparatus has been shown more or less diagrammatically it will be understood that it may be fabricated from secured together components, as may be convenient.

Various changes `and rnodihcationsl may be made in the form of the apparatus, without departing from the spirit 4 and scope of the invention, it is desired therefor to be limited, if at all., by the appended claims, rather than by the foregoing description of the invention.

It is desired to claim and secure by Letters Patent of the United States, the following:

l. Head-box and recirculation apparatus for paper making machine comprising, elongated front and rear and opposite end walls arranged in vertical relation providing an elongated vertically disposed head-box, lower ends of said walls formed to provide an inlet for stock and portions of the front wall thereabove extending forwardly to form an apron and a slice thereabove providing a stock outlet and a chamber rearward-ly thereof, an elongated conduit extending upwardly vertically and rearwardly of said rear wall having a stock return at the lower end thereof, plurality of vertically spaced elongated hori zontally disposed headers extending between said conduit and rear wall of the head-box, a connection between the lowermost of' said headers and stock return, connections between said conduit and the headers above said lowermost header, a plurality of horizontally spaced connections between each said header and the rear wall of said i head box, and means for controlling stock ow between References Cited in the le of this patent UNITED STATES PATENTS 2,619,011 Sta-ege Nov. 25, 1952 2,688,277 Luebke Sept. 7, 1954 2,737,687 Bennett Mar. 6, 1956