US912285A - Process for making paper barrel-staves. - Google Patents

Description

J. T. COLLINS.

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APPLIUATIOI FILED APB. 1B, 1008.

Patented Feb. 16, 1909.

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,r1/lll JOHN T. COLLINS, OF HARTFORD, CONNECTICUT.

PROCESS FOR MAKING PAPER BARBEL-STAVES.

Specification of Letters Patent.

Patented Feb. 16, 1909.

Application led April 18, 1908. Serial No. 427,925.

To all whom 'it may concern:

Be it known that I, JOHN T. COLLINS. a citizen of the United States of America, and resident of Hartford, in the county of Hartford and State of Connecticut, have invented certain new and useful Improvements in Processes for liflaking Paper Ilarrel-Staves, of which the following is a full, clear, and exact description.

This invention pertains to process for making paper barrel staves, and has for its object a process which will produce in a single operation a stave which is cut, shaped, formed with chines and Crozes, and simultaneously compressed into the desired finished product ready for purposes of assemblage into barrels, or the like.

The process more particularly resides in a peculiar softening, by steaming, meistening, or other approved method, of sheeted paper pulp stock or blank material from which the staves are produced, prior to such stock or blank material being shaped by compression. The steaming or moistening penetrates the stock only to a comparatively small extentV of its thickness, being but a surface softening thereof, leaving the core, bulk, or mass of the stock in its original hardened state or condition. The softening of the stock takes place at the ends, sides top and bottom faces of the stock.

In the following specification the details of the process will be more fully set forth, further objects being disclosed and set forth therein. i

In the drawings, showing one form of apparatus whereby the process may be practiced: Figure 1, is an inverted view of the male die forming a part ofthe apparatus, Fig. 2, is a plan View of the female or bed die, Fig. 3, is a longitudinal section taken through the two dies the same in the act of forming a sta\e, Fig. 4, is a transverse section of Fig. 3, on line 4-1 of Fig. 3, Fig. 5, is a fragmentary view slightly enlarged showin@ the stock of sheeted paper pulp from willich the staves are formed, illustrating by dotted lines the extent of steaming or otherwise softening of the stock, Fig. 6. is an enlarged transverse section taken through a completed stave, illustrating by dotted lines the form assumed by staves of paper pulp after having been made accordln to the practice which has generally obtained prior to thisinvention, and Fig. 7, is a reduced transverse section of a stave blank showing by dotted lines the extent of softening of the sheetcd paper pulp.

The female or bed die is composed of a base plate l, on the upper face of which the die proper is carried, the latter as depicted in the drawings having a concave compres sion face or surface 2 whose curvature conforms to that of the outer side or face of the finished stave. Adjacent the bounding edges of surface Q, the die is formed with a groove 3, which in outline conforms to that of the stave product, this Groove receiving a filling of lead or other soft metal 4, for a purpose presently obvious. Base plate l, is equipped with Guiding posts 5, projecting upwardly therefrom, whose function it is to provide guiding movement to the male die member in its operations, for which purpose the supporting plate 6 of the male die member is formed With openings 7, receiving posts 5.

The male die member is formed with a die compression face or surface 8, of convex contour, its curvature corresponding to that of the female die face or surface. Suitablv secured to the sides and ends of the male die are cutting blades 9, the side blades being shaped or curved from end to end to conform to the configuration of the finished staves, which latter taper in curved lines from their middle portions to their ends. It is to be especially observed in Fig. 4;, that the inner side faces of the blades 9, are tapered as indicated at 9, so as to impart to the side edges of the staves their roper angularity. The end blades prescri e the predetermined len th of the staves and when combined Wi'i the side blades constitute, so to s eak, the sharpened Walls of a box. The b ades or knives are beveled at their free ends as indicated at l0, so as to effect a positive and clean cut of the a er pulp, the knives or blades finding a soft fied in the inset lead strips 4, as above set forth so as to not dull or otherwise impair the efficiency of the cutting edges of the knives or blades. The male die member on its die face is further formed adjacent its ends with outwardly projecting croze forming ribs 11, whose function it is to form the croze at each endof the stave. Beyond these ribs the male die face is formed with a slight depression 12, to form the chines.

Prior to subjecting the stock of which the staves are formed to the action of the apparatus above set forth, the stock, which may be in the form of a sheet or strips of proper dimensions, is steamed, moistened or otherwise softened at the external or surface p0rtions only. leaving the greater mass or hulk at the inside in its normal hard condition. By so softening only the surface ortions of the stoves., stock or blank as ccpicted by dotted lines in Fig. 5 of the drawings, the linished stave when removed from the dies at the completion of their operation, re- I tains its proper are shape. 'erc the stoel: i to be softened by steaming entirely through i its mass, a stave after leaving the dies, would in drying curl in an extreme manner i as shown by dctted line Fig. o.

The stave stock or blanks are produced: from sheeted. per ulp of greater thick ness than the gillen product for instant-e 1 if the stock is tive-eighths of an inch iul thickne they are colngu'essed b5' the die zicv E tion to three-eighths of an inch in thickness. It; is therefore to be observed that the surface or partial softening of the blanks is of the greatest and utmost importance. since the body. mass. or bulli of the blank is allowed to remain iu its original hard condition, and is in fact given second compresv sion to further increase its degree of hardness. Moreover it is to be noted that the; .softened lne of pulp will by the act ofC compression be hardened to an extreme degrec inasmuch as the unsatened or hard portion of the :ness of pulp wi l provide a rm solid hed on which the wtened mass is i compressed. Thus both the softened and unsoftened portions proit by their di'erent stated conditions during the process of compression.

in operation the snoei: us aina-said either i in sheets or in .strips of proper length har ing been surfaced softened is introduced between the two dies. The male die is then operated in any suitable manner to compress the stock so that the same assumes the position between the dies as depicted in P" 3 of the drawings. The descent of the maille die upon the stock is accom anied by simultnneons cutting action of t e blades which trim the stock and cut the saine into desired length and width. The chine-s and croates are also formed in this stated operation and the side blades due to their bevel as illustrated in F 4, impart the required angularity to the stare sides such as is necessary to provide a perfect it between adjacent stares in the finished barrel. The lead inset or lling contacts with the cutting edges of the knives and thereby provides a sealing joint or union between the two dies preventing the egress of the softened pulp during the heeey compression of the stock.

It is understood that the sheeted paper pnl from which-the stares are made is in lts' lshed condition .at the'tme of softenng,`that fs;to say in its'mannacture it has Etna cned by compression or otherwise.

To practice the present invention the hardened sheet pulp is partially softened and its softened portions shaped by compression to form the finished stave as depicted in the drawings. Thus the re-com ression of the softened arts gives added Hardness to the surface ot the stares, rendering the surface finish of increased durability, since the compression of the softened parts is backed up or rorided a bard bed by the unsoftened bull; of the stock.

Haring thus described the invention what claimed is l. A. process of making barrel stares of sgi-.cried paper pulp consisting in softening the stock at its bounding surfaces only, leav. ing its center in its original hardened condi- :i=n and in then shaping the stave.

2. -i process of making barrel stares of lae1-tcd paper pulp which consists in partially softening the side faces of the pulp stock and in then shaping the stoves by compression.

3. proces` of making barrel stares of previously hardened and compressed paper pnlp which consists in softening the pulp adjacent the surface thereof so as to leave the core or bulk of the stare in its original hardened condition, and in then shaping the stave and displacing ortions of its softened snrface to form the c ines and crozes.

4. A process of making barrel stares from szeeted :iper pulp which consists in partially so and then in shaping such softening parts, by compression, on the unsoftened parte of the paperlpnlp. n I I l f u. :x pluck-:s ui inhaling udii'rn ui 16311 paper pulp which consists in partallv softenng the stock, conpressiug such softened parts to harden and shape the same, and simultaneously cutting the stock into stares of re usite size.

6. process of making barrel stares of sheeted paper pulp which consists in softening the surface portions of the stock and leaving the mass or bulk o the stock in its original hardened condition., and then in compressing the softened portions to shape the stare whereby the finished stave has a less thickness than the slieeted paper pulp.

T. The herein described process of makinv barrel stares of sheeted aper pulp whic has a thickness in excess oi) the finished stave, which consists in softening the stave faces and leaving the center thereof in its original hard condition and in then compressing Ysuch softened faces to sha e the same.

Signed by me ut gpringeld, Masmchw sette, in presence of two subscribing witnesses.

JOHN T. COLLINS. Witnesses:

G. R. Datecom, W. Bnnmws.

enng hardened sheeted paper pulp

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