US1181963A - Paper cup. - Google Patents

Description

G. J. BOHLMAN.

PAPER CUP.

TION FILED NOV. 2,1

Patented May 2, 1916.

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Specification of Letters Patent.

Patented llllay 2, 191th...

application filled November a, 1914. Serial No. M9363.

To allwhomz'tmay concern:

Be it known that I, GEORGE J. BOHLMAN, a citizen of the United States, ll/ledford, in the county of Middlesex and State of Massachusetts, have invented an Improvement in Pa er Cups, of which the following" is a speci cation.

This invention relates to paper drinking cups or other paper receptacles, and has for its object the production of a cup having an improved form of rolled-edge at either or both ends of its body. A rolled-edge at the top of the cup is of advantage as contrasted with the usual thin' shar additional stifl'ness and rigiditytothe cup, and also presents a smooth lip-engaging portion which will not have a tendency to cut the lip; and a rolled-edge at the bottom of the cup is also of advantage, as by it a stifl' flange is produced below the bottompiece, by which to support the cup in upright position, even when tilled, and by which the bottom-piece is held from dropping out, so that bottom-pieces composed of flat disks may be employed.

Heretotore paper cups have been produced with rolled-edges, but the methods employed for producing them have been and'an era amount of paraflin wax employed, which not only increased the expense but also increased the weight oi the cups to such an extent that when the cups were in a-pile oi, say, one hundred, the increased weight was objectionable. Furthermore, in warm weather the parafiin wax softened, and when several cups were nested in a pile they had a decided tendency to stick together, so mu'chso, in fact, that cups heavily or even moderately coated, or having portions heavily or moderately coated with paraflin wax, could notbe' used as an all-year-round cup. Even in case the rays of the sun were allowed to strike a pile, the araflin wax would not only soften, but would run, whereupon the cups of the pile would weld together.

in carryin out my invention, the paper therein, and while said cup-body is on the form on which it is made, or on a similar form, the para is applied to it in the term of a liquid spray, at a high temperature, which is caused to spread over its entire outside surface, and as a result the pa residing at.

edge, as it gives.

per becomes thoroughly saturated, and is,

therefore, 1n temper, and while in such condition it can be easily stretched and bent without breaking, and, therefore, while in temper, one or both of its end-portions are subjected to a suitable bending or edgerolling-device, by which they are rolled over, thereby to produce a rolled-edge at either or both ends, and then said body is allowed to cool and the parafin to set or corfigeal, whereupon the paper becomes quite sti and its rolled-edge becomes permanently set. In case the paper is thoroughly saturated with the hot or melted paraffin wax, it will be found that when congealed there is present on the surface of the paper a very thin coating. The complete satura tion of the paper isthe main requisite, so that it will be substantially waterproof, but the coatin which is present on the surface must be 0% no appreciable thickness, otherwise the cups, when nested, will have a tendency to stick together, particularly in warm weather. The roll which is formed at the I edge, is of small diameter, but is suficient for the purposes desired.

Figure 1, is a side elevation and partial longitudinal vertical. section of a paper drinking cup having both end portions formed with rolled edges. Fig. 2, is a side elevation and partial longitudinal vertical section of a paper drinking cup having its upper end-portion formed with a rolled edge. Fig. 3, is a side elevation of a paper cup before the rolled-edges are, produced, and illustrating a spray or jet of liquid paraflin which is being directed upon the cupbody, and the molds or forms which may serve as bending-devices. Fig. 4,.is a similar View, showmg the end-portions of the cup-body rolled over.

10 represents a pa er cup-body, and 12 a.

bottom-closure there or, both of which may be of any well-known or suitable construction. After the body is produced, it is placed on a form 15, or while reposing on the form on which it isrnade, a spray or et of melted parafin wax, indicated at 16, is

directed upon it, which is extended over' its entire surface, and which acts to coat the body but more particularly to saturate the aper, so that it is in good temper, andmay e easily bent without breaking. The liquid paraffin wax in the term of a spray spatters the paper, and the numerous spots coalesce to completely saturate the paper. He the p we its ends are rolled over by a suitable shot 11.; and bendingdevice, such for instance, as rep in Fig. 3, wherein a plate 20 is arrangedat the cup-body is in bottom of the form having a shallowgroove 21, semicircular in cross-section, adapted to receive the lower end of the cupbody, and by a slight downward pressure upon said body its end-portion or edge is caused to follow *the-curvedwall of said groove and thereby to stretch and bend out- -wardly, upwardly and'then inwardly, substantially com leting a circle, although the distance said nd is continued may var more or less. Also, a similarl grooved gala 30, is or maybe arranged a ove the orm, the groove 31 of which receives the upper end-portion of the cup-body, as said plate and form are moved one toward the other,

with the result that said end-portion is similarly bent. -After the bend or bends are formed the cup-bod is allowed to cool whereupon the para congeals, and the paper is caused, to remain in the position in which it is bent, becoming ermanently set.

The paperbody with its rol ed edge or edges thus formed 18 quite stiff, and are incidentally coated with a very thin film or layer of wax of uniform thickness, and although the rolled edge or edges areof small di- 9 them to which they ameter they are sufliciently rigid to prevent being broken by any pressure or'stram upon and provide smooth rounded lip-engaging portions which will not have a tendency to cut thelip.

The; paper-rece tacle herein. described 7 havinga rolled e which is com letely and uniformly; saturated with para are ordinarily su j t wax menses stance as described in my a plication No. 869,762, filed concurrently. w th this application.

Themethod herein described forms the sub ect matter of a divisional'application #9,261 filed February 19, 1915..

I cla1m 1. A frusto-conica-l paper drinking cup having a rolled edge at the top, sa'id cup including its rolled edge being completely saturated with parafiinwax, but having no .appreciable amount of paraflin wax upon its surface at any as described.

2A frusto-conical paper drinking cu having a rolled edge at the bottom whici engages the under side of the'bottom piece, saidcup including its rolled edge beingcompletely saturated withparaflin wax, but havpart thereof substantially mg noappreciable amount of parafiin wax upon its surface at any part thereof, substantially as described. I

In testimony-whereof, I have] signed my name to this's'pecification, in the presence of two subscribing witnewes.

GEORGE] 'J. BOHLMAN.

Witnesses: EmzAnn'rmM. HANSON,

Amos L. Terms.

arafiin wax may. be produced by other-met ods, as for in-

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