US389964A - Peters - Google Patents

Description

(No Model.)

E. HUBBARD. PROCESS 0F MANUFACTURING PAPER PAILS. No. 389,964.

5571.1atentedSept. 25, 41888.

A' .a e..i Q.. h l

vvuengwx Y l @AMM mme es.

UNTTED STATES PATENT Ormea.

EBER HUBBARI), OI" CHICAGO, ILLINOIS, ASSIGNOR TO CHARLES S. BURTON,

TRUSTEE, OF SAME PLACE.

PROCESS OF MANUFACTURING PAPER PAILS.

SPECIFICATION' forming part of Letters Patent; No. 389,964, dated September 25, 1888.

(No model.)

To all whom it may concern:

Be it known that I, HUBnARD, a citizen of the United States, residing at Chicago, county of Cook, State of Illinois, have invented certain new and useful Improvements in the Process of Manufacturing Paper Pails, which are fully set forth in the following specification, reference being had to the accompanying drawings, forming a part thereof.

1o Figure lis a partly sectional elevation of a metal form on which the pail is wound,with the body portion of the pail thereon, and a device for forming the bottom from pulp. Fig. 2 is a section at the line x rv, Fig. l; and Fig.

i5 3 is a vertical section of a pail formed by my invention.

This invention consists inthe process, llereinafter claimed, for making a paper pail integral, bottom and sides without joint, as of zo one piece, as ifmolded directly from pulp, but nevertheless having the body or sides niade of what is technically known as wound77 inaterial-that is, stratified paper formed of layer upon layer of paperpulp, or, to speak more exactly, film upon film. Such material is commonly produced by the process of winding the continuous iilrn as it comes from the cylinder of the paper-making machine about a revolving form, from which process it takes the name 3o ot' wound material or wound paper; but the same structure may obviously be produced by superposing successive films by other means than winding, and I use the name to indicate such a product however produced.

The bottom of my pail may be made either of wound or molded material. \Vhen made of wound material, it will be cut ont of a sheet of suitable thickness which has been formed in the usual manner by winding, as above 4o described,upon a cylinder and cut lengthwise, so as to be removed therefrom, and spread out in a flat sheet. XVhen formed of molded material, it will be molded directly upon the form upon which the body is wound, as more particularly hereinafter described; but in either ease it is formed in such manner and in such relation to the body portion as to be integral therewith even when it is not homogeneous. This result I accomplish as follows:

5o The body portion or side of the pail is formed by winding upon a form, A, a continuous film ot' paper-pulp drawn directly from the vat by the cylinder in the usual manner of making paper, the Winding being continued until the requisite thickness is obtained. This forni A is a metal cylinder or frustum of a cone, according to the shape of the pail to be made. As illustrated it is of the latter form. It may be hollow, but has a bottom, A', of sufficient thickness to serve the purpose of 6o forming the bottom of the pail, as hereinafter explained.

The body of the pail (indicated by the letter P) is wound as described, with a portion, p, protruding beyond the bottom of the form A. The 'form is then placed bottom upward upon a supporting bed or table, B, under a pistoni'ollower or die, D, which may be reciprocated vertically by any well-known means. (Not illustrated.) TherimE,havingthetaperingpart R, corresponding to the taper of the form A, is set down over and around the upper or smaller end ofthe pail on the form. The iuner diameter of this rim is only enough greater than that ofthe form to allow for the thickness of the paper body of the pail, so that the straight portion of said rim when it is placed, as described, about the pail and form com mences at the plane of the outer surface of the llat head Aof the Aform A, and, extending upward ther'eform, forms the side walls of a cylindrical chamber, into which is now placed the material of which the bottom is to be formed. This may be a sheet of wound paper pulp eut or formed of proper-size for such bottom and laid in upon the bottom (or, in its inverted position, the top) of the form, or it may be paper-pulp in mere mass. In either case the piston or follower F now descends into the rim R, which it closely tits, and forces the bottom material closely down upon the head of the form A and upon the lip or flange of the body p, which is also mashed down by the piston, so that a complete union is made between the said lip and the bottom material, both it and the bottom being in the condition of fresh-t1 c., undriedHpulp, the only difference being that the said iiange p is stratified, while the bottom may be unstratited mass; but the union effected is as complete as and loo perfectly similar to that which occurs between the successive films or layers of which the stratified body, including said flange, is composed.

If a chine is desired, the follower F will have a. portion cut away around its lower edge atf, into which the necessary amount of material will be forced as the follower descends upon the bottom. The follower being removed, the rim R may also be removed and the pail on the form A. placed in suitable place to become dry, when it may be ornamented or otherwise finished, as desired.

To facilitate the removal of the rim R, it is preferably made in several pieces, as illustrated, which are held together by a hoop, It, in the manner of the staves of an ordinary tub or barrel, and, this hoop being first removed, the said separate pieces or staves r may be withdrawn laterally away from the paper pail, thus avoiding` the danger of' in ntilating the pail, as might occur in drawing the rim off longitudinally, since it may not relieve easily from the fresh paper-pulp.

My process differs from any process which has heretofore been employed for the manufacture of pails or like articles in that the body and bottom are both in the condition of raw pulp when brought into contact for the purpose of uniting, so that they unite by the complete cohesion of the pulp which forms them respectively, and the structure when completed is integral and not merely cemented together.

I am aware that paper tubes made after the usual manner of formingpaper from pulp have been taken while yet moist and used as the body and portion of the bottom of a pail to which the remaining portion of the bottom, which was formed of paper strips and paperpulp and mueilaginons substance intermingled, was united by contact and pressure; but this method of forming pails is distinguished from mine in that the tube necessarily has become true paper (although still moist) before the bottom is applied to it, and such bottom cannot be securely joined to such body by a mere contact and cohesion, and in such process of manufacture reliance has to be placed upon interweaving the strips of paper which are used in the formation of the body and upon the use of mucilaginous substance to complete the union of the parts. I do not claim such a process; but my invention is dependent upon and limited to the fact that the condition ofthe parts when brought into contact for the purpose of uniting is that of pulp and not of paper.

I claiml. rIhe process of making paper pails, which consists of the following steps: first, depositing the pulp in successive layers or courses about a form to constitute the body of the pail; second, depositing on the end of the form on which the body is thus wound, and while said body is still wet pulp, a further quantity of wet pulp,la1;iping a portion ofsuch body, and molding said further quantity by suitable pressure against the cnd of the form to form the bottom,wliereby the body and bottom come into contact while both are still wet pulp, and in that condition cohere and become integral, and, third, drying the entire pail, substantially as set forth.

2. The process of making paper pails with a chine, which consists in the following steps: first, depositing wet pulp in successive layers or courses about a form to constitute a body; second, depositing on the end of' such form while the body is still wet pulp a further quant-ity of wet pulp, lapping a portion of the body to form the bottom of the pail; third, molding the pulp deposited for the bottom and thelapped portion of the body to form a chine at the margin of the bottom of'the pail; fourth, removing the molding device, and, fifth, drying thc entire pail, bottom, and chine on the form, substantially as set forth.

EBEE HU BBARD.

Attest:

(li-ms. S. BURTON, E. F. BURTON.

Images