US1538199A - Method of making paper dishes - Google Patents

Description

May 19, 1925.

E. G. MAXWELL METHOD OF MAKING PAPER DISHES Filed Feb. 15, 1923 Patented May 19, 19 25.

UNITED. STATES PATENT OFFICE.

METHOD OF MAKING PAIPER DISHES.

Application filed February 15, 1923. Serial No. 619,320.

To all whom it may concern.

Be it known that I, ETHEL GRACE MAX- WELL, a citizen of the United States of America, and resident of Wheeling, county 5 of Ohio, and State of West Virginia, have invented certain new and useful Improvements in Methods of Making Paper Dishes, of which the following is a specification.

This invention relates broadly to a method of making paper dishes, and more particularly to a paper receptacle of the type commonly employed by dealers in groceries and packing house products as containers for butter, lard and other semifluid commodities.

The primary object of the invention is to provide a method of making a substantially rectangular container or dish which is permanently formed of a single sheet or blank of paper without folds; gussets or other overlapping parts. i

A further object is to provide a method of makinga dish of the character mentioned having an oblong form and which'possemes such shape that its sides may be pressed or partially collapsed inward into closely appreaching relation without inducing a re sultant lowering of its ends to a level below that of its sides.

A still further object is to provide a method of making a flexible paper container which is pressed into permanent dish form 1 and which presents perfectly; plain and smooth interior and exterior surfaces. 35 In describing the invention in detail, reference is herein had to the accompanying drawings, in which Figure 1 is a top plan view of my improved dish;

4.0 Figure 2 is a side elevat1on of the same;

Figure 3 is a sectional View of the forming dies illustrating the means employed in sha ing the dish; and I Figure 4 is a plan view of the blank from which the dish is formed.

The dish composing the invention is formed from a single blank of heavy pulpboard paper and has a flat bottom 1 of rectangular form from which the sides 2 and ends 3 incline upward and outward. Said ends 3 are preferably made of materially greater height than the sides 2, so that when the latter are pressed toward each other, or partially collapsed, as in handling when filled, the ends will not thereby be lowered tor a level below that of said sides and, consequently, will not permit the contents to overflow said ends.

The dish is formed by means of a male die 4 and a female die 5 which coact to effect stretching displacement and redisposal of the fibers of the ends of the blank without any compressing or stretching of the rectangular bottom of the blank and with relatively slight, if any, compressing or stretching of the sides. To render such redistribution of the fibers readily accomplishable, the paper stock, preferably composed of a combination or mixture of mechanically and chemically treated wood pulp, is thoroughly steamed and paraffined, so that slight displacement of the cohering mass of fiber-like matter may be effected under the compressing and. drawing action which is exerted between the curved end portion of the companion dies. It will be understood that, since the displacement of the fibrous material of the blank occurs almost wholly in the end portions of the latter, the end portions of the dies, when fitted together, are separated a distance slightly greater than the thickness of the paper stock acted upon, so that in approaching its 'seat within the female die the male die acts to so displace and I'earrangethe fibers of the end portions of the blank that the latter possemes the relatively different form or shape required.

As used in the appended claims, the expremion plain and smooth surface is in tended to mean unbroken or free from folds, corrugations, pleats or overlap-ping portions.

What is claimed is 1. The herein described method ofmak- D5 ing a rectangular paper dish having its ends of greater'height than its sides, which consists 1n steam heating and parafining a paper blank, then in subjecting the blank to pressure to shape the dish and to form 100 the ends thereof of a thickness exceeding that of the sides, the excess paper stock in the sides of the blank being displaced under the pressure and caused to flow inwardly across said ends and supplementing the 1435 stock in the. latter.

2. The herein described method of making a rectangular paper dish which consists in moistening a paper blank, and then subjecting the blank to pressure on its opposite faces to shape the dish and to cause stock in the opposite sides of the dish to be displaced and to flow inwardly for supplementing the stock in the dish ends, so as to provide the dish with plain ends of a thickness exceeding that of its sides.

ln testimon whereof, I aifix my signature in presence 0 two subscribing witnems.

. ETHEL GRACE MAXWELL. lVitnesses E. T. MAXWELL, H. E. DUNLAP.

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