US2354564A - Sheet pulp container male die apparatus - Google Patents

Description

July 25, 1944. l.. M. WILEY l I 2,354,564

SHEET PULP CONTAINER MALE DIE APPARATUS July 25, 1944. l 1 M. WILEY SHEET PULP CONTAINER MALE DIE APPARATUS 2 Sheets-Sheet 2 Filed May 27, 1942 Patented July 25, 1944 SHEET PULP coN'rAmEa MALE4 ma APPARATUS Lee M. Wiley,

to Julian T.

Marion, Ind., assignor. of one-third Lett and one-third to Reeley B.'

Wiley, both of Marion, Ind.

Application-May 21. 1942, se'iai No. 444,672

7 Claims. (Cl. 18e-45) This invention relates to a male plunger die structure capable of changing shape under presy sure and when confined by a complementary female die.

This application is a continuation-in-part of application Serial No. 288,343,'fi1ed August .4,l 1939, now Patent No. 2,337,581, entitled Sheet.

pulp container forming process and apparatus therefor, and more particularly Figs. 16 to 19,

. inclusive, thereof, and application Serial No.

316,742 filed February 1, 1940, entitled Sheet pulp container forming process and apparatus therefor, and more particularly Figs. 1 and 2 thereof.

The former application refers to and discloses a solid metal male die of non-expanding type (Fig. 16) and a metallic, mechanically expanding male die (Figs. 1'1 to 19). The latter application refers to and `discloses a solid rubber male die deformable under pressure."

In all punches or male dies, not ported for pressure or vacuum application, the present invention is applicable.

It has been long known that paper material is somewhat abrasive in character when Ethere is relative movement between the material and a working member engaging same.

-In the former application, .the plunger or male parts are exposed to the presence of moisture, size, synthetic and natural resins, et cetera, and the latter enter between the relatively movable parts' of the die and tend to rust and clog same, respectively. Y

In the latter application, the rubber plunger or male die to have the necessary rigidly includes hardening and/or toughening agents, such as lamp black and the like. This plunger working on clear pulp sheets discolors, by sluillng rub-y ber particles and coloring materialsthe resulting container, which when finished are usually ivory`= like in appearance, unless the pulp impregnating materials utilized are controlled to produce a substantially transparent product.

Since these containers usually are utilized in lieu o f china (cups) and glass jars (cans) et cetera, wherein clean and sanitary appearance is highly desirable, it vis important that any discoloration be prevented. e

Lubricant between relatively movable parts of the mechanically expansible plunger or male die,

also if it escapes externally will discolor the product. p

The chief object oi the present invention, therefore, is to provide means to not only protect the die against wear, clogging et cetera but more position.

to Fig. l,

particularly to protect the ware against .discoloration.

sistsr in providing Vplungers or male dies of the aforesaid types c-`with very thin latex coverings of about the same .thickn ss, elasticity and consistency of toy balloons. uch sheaths are similar to the die in the non-expanded form and are smaller than the same so that they require stretching for die mounting and accordingly are held upon the die' by their own tension and will not be stripped from the die in the normal use thereof.` This sheath preferably' is substantially colorless and of approximately pure latex.

Other objects and features of the invention will be set forth more fully hereinafter.

The full nature of the invention will be understood from the accompanying drawings and the following description and claims.

In the drawings y e Fig. 1 is a central sectional view through an apparatus for blanki-ng, preliminarily creasing and then iitting a precreased blank into a receiving female mold with the male die therein and under initial pressure and with a sheath interposed between the male die and the article being formed thereby.

Fig. 2 is a similar view of the female die, the article, the male die with the sheath thereon, the latter being shown in the fully expanded Fig. 5 is a'central sectional view of theinven- I tion shown in Figs. 3 and 4, the section being taken along the line 5 lof Fig. 3 and in the direction of the arrow. i p

Fig. 6 is a perspective view of a sheath unapplied to the expansible male die.

Reference will first be had to Figs. 1 and 2, the so-called solid rubber die disclosure and initially In this iigure there is provided two spaced supports l0 and IlA between which there is passed intermittently a at pulp sheet A. Also positioned between these two supports and slidably supported by one support, herein i0, as at I2 and'yleldingly constrained as at |31 is a stripper plate il. Adjacent thereto is a cutting die i5 55, rigid with one support and associated therewith The chief feature of the present invention cona top plan view of one embodiment and in juxtaposition thereto-is another and c0- operating cutting" die I6 rigid with support ||.l

ating creasing structure including the cooperating portions and I8 which are movable towards and away from each other inthe aforesaid relative movement of the spaced supports previously set forth. Accordingly, when the blank is formed by shearing, the same is creased and then a support I9, carrying the stem neck 20 and a male die head arrangement 2| of solid rubber type, advances through the apertures Ila, |6a and |'|a to. draw the blank through the tubular portion 22 of the creasing structure.

Continued travel of the die seats the precreased, partially formed blank designated in Fig. 1 by the letter B in a receiver die 23, of female type. This die is supported upon a .base 24 which is movable and the die is provided with a valve controlled vent arrangement 25 and 25 to permit the escape of air trapped in the die in the initial seating of the semi-formed article and the male t punch therein. Continued movement of the member I9, since the rubber die is deformable under greater pressure, will cause the rubber die to conform to the interior 23a of the female die, thus forcing the article B `toconform thereto and at the same time to compress the preformed utea in the article side wall and also to redistribute the stock, as illustrated more particularly in Fig. 2.

Herein the female die 23 includes a throat or open mouth 21 and the male portion includes an annular extension or sleeve 28 which adjacent the die head forms a chamber 29. When the throat portion 21 andthe skirt portion 28 are suitably associated together, as show n in Fig. 2, and the member I9 is sufficiently advanced, the two telescope and accordingly confine thesocalled solid plunger and cause the latter to fill the chamber 29 as illustrated in Fig. 2 and fully occupy the enclosed arrangement except for that portion occupied by the article B.

As previously pointed out, there are certain inherent disadvantages resulting from the use of the construction as thus briefly described.

Referring to Fig. 6 it will bel observed that fthere is therein illustrated a sheath substantially cylindrical in form in its body portion, the same being indicated by -the numeral 3 0. One end isv closed as at 3|. The other end is open and defined by a reenforced portion- 32. This sheath is of substantially the same thickness and elasticity as toy balloon stock. It is, however, colorless, or substantially so. It is of substantially pure latex.

This sheath is applied to the solid rubber male die 2| and by reason of its elasticity it 'will stretch and conform to the same substantially throughout its entire area of contact with the die. These sheaths may have an initial conformation corresponding to the die outline et cetera. However, this is not necessary because of the inherent elasticity of` the sheath material. When applied to the rubber die` the sheath will closely conform to the surface of the die throughout all the sheath covered portions of that surface and this is by reason of the fact of the inherent elasticity before mentioned and the frictional contact between the sheath and the die.

It is observed that in Figs. 1 and 2 the die has from. Herein the numeral indicates a main.

in such an instance in view of the fact that the largest diameter of the die is intermediate the ends thereof, care must be exercized to exclude all air trapped between the sheath and the die end and this is effected as follows:

The sheath maybe inverted so that its end portion 3| may be pressed against the reentrant portion and then it can be reinverted after all the air has been removed between the reentrant portionof the die and the sheath. This will cause the sheath to substantially conform to the die end. Then the rest of the sheath can be worked back toward the neck portion supporting the die proper and when the die is completely covered, the remainder of the sheath will engage upon the rear face of the die head portion, this rear face being indicated by 2lb.

After proper mounting, the apparatus previously described, is manipulated in proper timed relation, as set forth in the application before mentioned,-to form a blank, precrease it, seat it in the receiver mold, then collapse the flutings in the side walls and then redistribute the stock, by. extension of the solid rubber die. During this operation, the sheath is interposed between the article and the die and accordingly, the die is not subjected to wear and neither will'the die Slough the rubber particles therefrom incident to such wear nor will any of the coloring matter or the other material in the die which mightemanate therefrom be applied to the article, vso that the article is clean and devoid of extraneous matter.

The elasticity is such, as previously set forth, that the sheath adheres to the male die so that when the male die is retracted from the receiver mold the sheath moves therewith, being in effect unitized therewith. Naturally when the movement is such that the malev die 'is no longer expanding, `.there is no suction between the articlesupport, 5| indicates a sleeve slidable thereon and within a collar portion 52, the two being aligned by means of a pin 53 carried by the portion 50 and seated in the aperture 54 in the collar 52. This pin between the main support portion 50 and the collar 52 rides in a slot 55 in the sleeve 5|.

a reentrant free end 2 la. In mounting the sheath 75 Secured to the sleeve 5| is a collar 55 which is suitably associated with mechanism for mechanically expanding the die, as hereinafter briefly pointed out.

It will be observed that the support for the die structurewhich is associated with the portion 50 is caused to move at appropriate times so that the member 50 is moved longitudinally into a receiver mold wherein there is positioned an article ofthe character previously described. l

f portion l Ycam face 16 on the sleeve 5I.

The end of themember 601s enlarged and extended laterally at the free end 'as at 80 and this is suitably tapered at its outer portion 6I. The' collar portion 62, before mentioned is integrall with the portion 62 and the latter is secured to the portion v6|) by the means indicated at 63, ,64, 65, and the nut 66, there being three of these constructions.

It will'be observed that this'connection is `of shouldered'type so that there is provided between the upper edge 61a and the lower edge 62a or faces, a channel of predetermined height. The

60 is recessed as at 61. Portion-62 is recessed as at 66. A movable portion of the die 69' which has an exterior face 1n includes a portion 1| seatable in the recess 61 and the portion 12 seatable in the recess 68. Springs 13 and 1,4 respectiVeIy,- urge this member 69 into the'retracted position. The member 69 has the inner inclined face 15 andthis is engageable by the wedge portion .16, an extension of the sleeve .5L When the wedge moves down-see Fig 4-the member 66 moves outwardly from th fullline position shown v in Fig. 4, to the dotted line position thereof.

There also is provided somewhat similar members 19 having the exposed face 86 somewhat similar to the 4exposed face 10. Herein the recess 61 is of annular character and the `member 19 includes a depending portion 8l. It is also seated in such recess. Themember 1Q has the inner\inclined face 66 also engageable by` the The member 19 includes a 82 therethrough and through rthis bore extends the portion 64, previously set forth. The portion 64 in turn is recessed as at 84 and springs 85 are interposed between one wall ofthe bore 82 and the member 6d being seated in the recesses 84 thereof. Hence, the member 19 is normally constrained to retracted position. When the' sleeve 5l is caused to advance toward the free end @il the wedge cam face 1B engages the severalfaces 15 and 86 of` the several expansible members and I moves them outwardly to the dotted line positions to form a complete `periphery of expanded type.

The sheath shown in Fig. 6 is mounted on this solid metal mechanically expansible male die and when the latter is in the collapsed or retracted position and when so mounted, the reeneforced end 32 rests on the shoulder face Q3 of the portionl t2 as illustrated. This shoulder edge may be slightly rounded as indicated at @I so that 'it will not have a sharp cutting edge and, therefore, will not cut the sheath. As previously described, such a sheath, by reason of its inherent elasticity and because it is initially slightly smaller than the male die when collapsed, will' stretch and be frictionally engaged withl the male die when collapsed and yet will expand as required, when the die is enlarged laterally. In operation the friction lock between the sheath and die is such that any suction action between the article and the male die following the dieing operation will not .be

longitudinal bore s upon the die.

From the foregoing, thereto it will be apparent that in both embodiments of the invention illustrated, the article is protected from the male die` and they male die in turn is protected from the action lof the article so that replacement of the sheaths'as they wear, et cetera, will insure substantially permanency of the dies mentioned.

While the invention has been described in association -with laterally expansible dies, it'is apparent Athat a sheath of this character may be utilized to prevent wear of the male die when the same is of solid metal and non-*expansible type, at least one of which is illustrated in one of the aforesaid copending applications.

While the invention has been'illustrated and described in great detail in the drawings and Lforegoing description, the same is to be considered as illustrative and not restrictive in character.

The several modifications described herein as well as others which willreadily suggest themselves to persons skilled inthis art, all are con- 'sidered to be within the broad scope of the invention, reference being had to theappended claims.

The inventionvclaimed is:

1. -I n a die structure comprising a substantially closed end female die adapted to receive a cupf' scopically, mounted upon the body portion and sumcient to 5mn the sheath from the die. Any

\ and furthermore, any 1ubricatinn included in this [male die cannot accidentally escape and discolor. the article. Furthermore, the .sheath itself takes -die received free end peripherally enveloping the same and the female die received free end of the male die, the internal peripheral dimensions of said sheath normally' being slightly smaller than the external peripheral dimensions of the body portion when not expanded, said sheath having sucient inherent elasticity for self-retention upon the male die body portion and for expanding therewith.

2. In a die structure comprising a, substantially closed end female die adapted to receive a cuplike, pressure moldable product, and a male die supported atene end `by a male die support and with the product between the dies, said male die comprising a body portion ysupported at one end by said support and the end opposite the supported end being free and of. pressure molding type and laterally expansible incident to the application of axial pressure thereto after insertion into the female die, and a rubber-'like sheath. telescopically mounted upon the body portion and peripherally enveloping the same and the female of the male die, the internal peripheral dimensions of said sheath normally being slightly smaller than the external peripheral dimensions of the body portion when not expanded,

herent elasticity for self-retention upon the male die body portion and for expanding therewith, the male die support at its junction with the male die having a cross-sectional area appreciabiy less than that of the male die at .that junction, whereby tlemale die at that Junction forms a shoulder, saidy shia-th having its open any abrasive wear which the articles might have one end said sheath having a. suilicient irl-- end positioned upon said shoulder and dened by a slightly reenforced edge.

3. A die structure asy deiined by claim 1 wherein said expansible male die comprises relatively i movable parts and is of mechanically expansible type, said sheath preventing clogging of the male die parts.

4. A die structure as dened by claim 1 wherein said expansible male die is of so-called solid rubber type, said sheath closely conforming to the surface thereof for the protection of the prod-I uct in al1 stages of die expansion, said sheath being of a rubber-like material other than that ofthe so-called solid rubber type and which will not contaminate the interior surface of the pressure moldable product.

5. In a die structure comprising a substantially closed end female die adapted tolreceive a ,cuplike, pressure moldable product, and a male die supported at one end by a male die support and with the product between the dies, said male die comprising a body portion supported at one end by said support and the endopposite the supported end being free and of pressure molding type and laterally expansible incident to the application of axial pressure thereto after insertion into the female die, and a rubber-like sheath telescopically mounted vupon the body portion and peripherally envelopingthe same and the female die received free end of the male die, the internal peripheral dimensions of said sheath normally being slightly -smaller than the external peripheral dimensions of the body portion Awhen not expanded, said sheath having a suftlcient inherent elasticity for self-retention upon the male die body portion and for expanding therewith, the male die support at its junction with the male die having a cross-sectional area appreciably less than that of the male die at that junction, whereby the male die at that junction forms a shoulder, said sheath having its open end positioned upon said shoulder and defined `by a slightly reenforced edge, said expansible male die comprising relatively movable parts and being of mechanically expansible type, said sheath preventing clogging ofthe male die parts.

6. In a. die structure comprising a substantially closed end female die adapted to receive a cup- 6 by said support and the end opposite the sup- :ported end being free and of pressure molding type and laterally expansible incident to the application of axialpressure thereto after insertion into the female die, and a rubber-'like sheath l telescopically mounted upon the body portion and peripherally enveloping the same and the female die received free end of the male die, the internal peripheral dimensions of said sheath normally being slightly smaller than the external l peripheral dimensions of the body portion when not expanded, said sheath having a sutilcient inherent elasticity for self-retention upon the male die body portion and vfor expanding therewith, the male die support at its junction with the male die having a cross-sectcldnal area appreciably less than that of the male die at that. v

Junction, whereby the male die at that junction forms a shoulder, said sheath having its open end positioned upon said shoulder and deilned by a slightly reenforced edge, said expansible die being of so-called solid rubber type. said sheath closely conforming to the surface thereof for the protection of the product in al1 stages oi' die expansion, said sheath being of a-rubber-like material other than that of the so-called solid rubber type and which will not contaminate the interior surface of the pressure moldable product.

7. In a. die structure the combination of a male die, a support therefor, and a rubber-like sheath,

the male die comprising a body portion supported at one end by the support and the end opposite the supported end being free and of pressure molding type and laterally expansible for molding purposes, the sheath beingnormally slightly smaller in cross-sectional area than that of the support providing a shoulder, the sheath terminating at the shoulder and bearing thereon.l

' LEE M.

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