US168186A - Improvement in the manufacture of pasteboard - Google Patents

Description

' 2Sheets--Sheetl.- G. W. RUSSELL,

Manufacture hf Pasteboard. I No. I68,l86, r Patented Sept.28,l875'.

III] I 4w. WRussdl.

MPEG3, FHOITO-LHHDGRAPHER. WASHINGTON. D is.

facture, directly from the NI'IED STATES GEORGE W. RUSSELL, OF LAWRENCEMASSAGHUSETTS.

'IMPROVEMENT IN MANUFACTURE OF PASTEBOARD.

Specification forming part of Letters Patent No. 168,186, dated September 28, February 23, 1875.

To all whom it may concern:

Be it known that I, GEORGE W. RUSSELL, of Lawrence, Essex county, Massachusetts, have invented a Method of Manufacturing Thick Papers, of which the following is a specification:

This invention relates to means for producing thick papers for various purposes, which are obtained by the unison or joining together of several layers or sheets; and consists in the method, hereinafter explained, of pasting or cementing together two or more webs of partially-completed paper in the process of manuvats, and previous to being dried.

Thedrawings accompanying this specification represent, in Figure 1, a plan, and in Fig. 2 a vertical and longitudinal section, of a cylinder paper-machine embodying my invention. Fig. 3 is a side elevation of a portionof one of the stuff-vats, showing the .application of my mechanism thereto. Fig. at of the said draw-- ings represents a perspective of one of the stuff-vats, showing the application of the pasting trough and roll.

In these drawings, A and B represent two stuff vats of a cylinder paper machine, so called, the cylinder molds which wallow in the pulp contained in such vats, and upon which the film or web of pulp is formed, being shown at O G and D D, respectively, while the endless carrying-aprons for supporting the web as it leaves the mold are shown respectively at E F, and the various rollers about which such aprons. travel at a a a, &c. The pressrolls nearest each vat are shown at b b and c 0, respectively, and the web of pulp from each vat at d and 6, respectively, the rolls for sup porting the first web (1, after the latter leaves its endless apron and before joining the second web, being shown at f f, &c.

The above elementary features are common to cylinder paper-machines now in general use, and contain in themselves nothing to which I lay claim.

In carrying the principle of my invention into practice, I combine with the machine an apparatus for applying a coat of paste to the under side of the upper web, and to efi'ect this result I proceed as follows: Between the housings or standards g g, which surmount the vat 1875 application filed B and carry the rolls f f before named, I dispose a horizontal trough, H, which spans the area between the housings, and is capable of containing a small quantity of paste. overflow-pipe, i, connects the interior of the trough with a cistern, j, arranged alongside of the vat B, and serves to carry back to such cistern any excess of paste, which would otherwise overflow the trough, while a second pipe, is, connects the interior of the cistern with a pump, "5, arranged alongside of it, and I a third pipe, m, connects the pump with the interior of the trough. A paste distributing or applying roll, n, is disposed within the trough, and wallows in the paste contained in the latter, and this roll is so situated that the first web of pulp travels in contact with it. A pulley, 0, is affixed to one end of the roll a or its journal, and. this pulley is belted'to a drivin g-pulley affixed to the journal of the. lower press-roll 0, which rotates the roll a in the paste contained within the trough. The pump 1 isdriven by a suitable power, and serves to force paste from the cistern j to the trough H, to supply the amount taken up and applied by the roll n, and the overflow-pipe leading back to the cistern enables me to keep the trough filled at all times without danger of overflowing it.

The result of this arrangement of the pasting mechanism will be seen at a glance.

The under side of the first Web 11, as it trav- I els over the pasting-roll it, receives a coat of paste from such roll, and as the two webs meet and pass together through the press-rolls c 0 they are thoroughly united, and subsequently dried upon the drier of the machine.

The two webs d and e, as they reach the vicinity of the pasting-roll, are naturally in a somewhat porous and plastic orsemipulpy condition and in a state highly favorable to receive the paste to the best advantage, as the fibers are in practically a loose and open condition, and the paste permeates them to such an extent as to efiect an almost homogeneous mass or web.

I am enabled to produce by my method a thick paper or board, composed of several sheets or layers, which will never split or bein texture.

produced by the union of several sheets or layers in different manners. For instance, in the manufacture of printers press-boards or papers, two or more webs are completed in the machine, with the exception of drying, wound upon reels, and, while in a moist condition, united or run together, without means of securing'them other than the natural adhesive properties which they possess or may have acquired while in a pulpy condition. I am also aware that thick papers have been manufactured by running together two webs in a semi-pulpy'condit-ion prior to their entrance to the press-rolls; but in this instance, as in the first, no means outside of the pulp, as it leaves the vat, are brought into use to secure the webs together.

I have found, during an extensive experience as a paper-manufacturer, that these modes of producing thick papers cannot be depended upon, as there isgreat tendency of the webs or sheets to separate; and I have found this objection especially applicable to the manufacture of hristol-board, so called, and paper for merchandise tags and labels, the two latter especially,.owing to the hard usage they undergo.

invention to exist.

I claim- 1. The described improvement in the manufacture of thick paper from two or more webs of pulp, which consists in the application of paste to said webs at the time and in the manner set forth that is to say, while said webs are yet in a plastic, semi-pulpy, and incomplete condition, and in transit to the pressrolls, by which the several pasted webs are united and joined in a single homogeneous sheet, as described.

2. The combination, with a paper-machine, of a trough for receiving a limited quantity of paste, a roll wallowing in such paste, and transmitting the latter to one or more webs of pulp, and finally of a cistern for containing a considerable quantity of paste, and a pump connected with such cistern, for delivering such paste to the trough, an overflow-pipe extending from the trough to the cistern, and the whole being substantially as and for the purposes stated.

GEORGE W. RUSSELL.

Witnesses: v

J. M. WHEATON, A. N. BURBANK.

Images