US1896076A - Container and manufacture of same - Google Patents

Description

Feb. 7, 1933- e. o. FROSTAD CONTAINER AND MANUFACTURE OF SAME Filed July 25, 1929 4 Sheets-Sheet l @iNigFOR v aha Feb. 7, 1933. G. o. FROSTAD CONTAINER AND MANUFACTURE OF SAME Filed July 25, 1929 4 Sheets-Sheet 2 O f 3 .0 J,

I i INVENTOR 1933- G. o. FROSTAD CONTAINER AND MANUFACTURE OF SAME Filed July 25, 1929 4 Sheets-Sheet INVENTOR 1933- G. o. FROSTAD CONTAINER AND MANUFACTURE OF SAME Filed July 25, 1929 4 Sheets-Sheet 4 FIGJ4.

@NgfOR Patented Feb. 7, 1933 UNITED STATES PATENT orl-"lcs GEORGE O. FROSTAD, OF MILWAUKEE, WISCONSIN ASSIGNOB .TO NATIONAL PAPER CAN COMPANY, OF MILWAUKEE, WISCONSIN, A CORPORATION 01' WISCONSIN CONTAINER AND MANUFACTURE OF HAIR Application filed July 25,

This invention relates to containers and their manufacture. It relates more particularly to containers made of semi-flexible or workable material such, for example, as paper or fibrous material.

The invention further relates to a container of the type mentioned which is adapted for containing both solids and liquids, but which is particularly suitable for use in dispensing liquids in relatively small quantities such, for example, as milk in pints and quarts.

The invention also contemplates a novel method for manufacturing containers such as above mentioned and a. novel apparatus adapted for use in the manufacture thereof. Such method and apparatus are claimed in my copending application Serial No. 586,- 839 filed Jan. 15, 1932. which application is a division of this application.

This application is in part a continuation of each of my co-pending applications Serial Nos. 128,006 and 297,821. filed, respectively,

'on August 9, 1926, and August 6, 1928, the

latter of which is a division in part of the former.

Containers have heretofore been known which are made of semi-flexible or workable material and which are adapted for contain ing relatively small quantities of liquids. One known type of such containers is made up of a tapered body portion which is formed of a piece of material wider at one end than at the other, the opposite edges of which are glued or joined together. A bottom closure is connected with the larger end of the body and opposite wall portions at the smaller end of the body are brought together and clamped with a metal strip to complete the sealing of the container.

Containers such as that just described possess certain inherent defects and disadvantages, particularly when used for dispensing milk. In the first place there is a tendency for the milk to seep into the joint in the container body, possibly separaing the connected wall portions at the joint and permitting leakage, 1 and tending to cause pollution of the milk by the glue or binding agent.

In the second place, by reason of the fact that the size of the containerbody decreases 1929. Serial No. $80,983.

from bottom top, and also by reasonof the fact that opposite wall ortions are brought together at the top, t 0 cross sectional area of the container at its upper portion where the cream tends to separate from the milk is very much 1cm than the cross sectional area at the lower portions of the container. This fact tends to deter the separation of the cream from the milk, as cream separation is most effectively accomplished when the surface area is greatest. In other words, the effect is substantially the same as in the old type of narrow necked glass milk bottles. Some cream will find its way to the top, but on account of the reduced cross section at that portion of the container, a large percentage of cream which would separate out if the area were greater remains mixed with the milk. It is of course desirable that every opportunity be given for cream separation in order that as soon as the container is opened the cream may first be poured out in one vessel and then the'milk used separately.

In the third place, the use of a metal clip for clamping the opposite portions of the container body together at the top is most undesirable. Not only does the use of such a clip necessitate special machinery for feeding the metal strip and cutting it off in the sealing of the containers, which, when considered in connection with-the cost of the strip itself, greatly increases the cost of the containers, but there is also danger that the milk within the container may come in contact with the metal strip and thereby become contaminated. Considering the low cost of the container as a whole, the additional expense involved in the supply and application of a metal sealing strip is high.

Furthermore, on account of the joining of opposite portions of the container body to form the top closure, the entire body is placed consequently weakens the container and introduces a further danger of leakage.

Some of the disadvantages abovenoted may be to a certain extent obviated by using a container of a different sha e, such, for example, as a cylindrical container. Containers of cylindrical shape have heretofore been used for dispensing milk in stores, but their usefulness would not extend to the delivery of milkin large quantities to domestic consumers. The cost and inconvenience involved in hand ling cylindrical containers is ver great owing to the fact that only a relatively small number of such containers can be carried b a man at one time. The generally we go shaped type of container such asabove described is therefore most suitable for dellvcry from house to house because of the fact that a deliveryman, by placing the tops of the containers together, can carry as many as four or five in each hand without danger of dropping them. This factor is of importance because of the speed which must be exercised in delivering fresh milk early in the momin %)ne of the objects of this invention is to provide a container of generally comcowedge shape which entirely obviates all of the disadvantages above noted with respect to the known types of milk dispensing containers referred to. I provide a container, the body of which may be formed without the undesirable joint extending from top to bottom, which provides an enlarged cream separation space, which does away with the use of a metal clip for sealing the container at its top, which is effectively sealed at the bottom in spite of deformation or warping, and which is very easy to handle even in large numbers. I further provide a method of forming such containers and an apparatus for use in their manufacture which greatly reduce the ultimate cost.

I provide for the utilization of a cylindrical body blank which may, if desired, be formed out of a substantially rectangular piece of paper joined or glued together at its opposite edges, but which is preferably convolutely or spirally wound upon a mandrel. With this type of construction parafiine or other waterproofing agent may be applied after the body wall is made. The blan may be of laminar construction composed of several thin plies of wound material. Melted parafline is preferably sprayed on the paper as it is wound, thus holding the plies together and thoroughly waterproofing the laminated body, as described, for example, in the patent to Hulbert, No. 1,380,103, granted May 31, 1921. The cylindrical laminated bodies are of stronger contruction and are much more satisfactory than those formed in a single layer from a tapered blank.

The perimeter of the tapered blanks above described gradually decreases at cross sections thereof from bottom to top. Therefore, even though opposite wall portions are one dimension and forcin brought together at the top, thus decreasing the material out laterally to increase the ot er dimension, the greater dimension at the top of .a container made up of a tapered bod blank is even less than the diameter at the ottom of the container. The cross sectional area at such upper portion is so small as to be almost negligile'. When, however, a cylindrical body blank is used and opposite portions thereof at the to are brought together to form a closure, t e decrease in one dimension causes a corresponding increase in the other dimension, so that after the container has been closed the breadth of it at the top is considerably greater than its diameter at the bottom. This results in a very much greater cream space and also provides a larger handle or grip portion at the top of the container, greatly facilitating its carrying by the deliveryman.

I provide for joining opposite wall portions at the top of the container without the use of a separate sealing means, such as a metal stri The sealing of the container is accomplis ed substantially in a single operation and may be done more quickly and much more economically than when a metal strip is applied. The top of the container presents a small portion of somewhat enlarged size which assists in grasping and holdin the container. Furthermore, the danger 0 cut ting the hand on the sharp edges of the metal strip is also done away with.

I further rovide a container of the type in question aving a bottom closure means comprising a closure member interengaging with the body and an auxiliary closure member cooperating therewith so as to maintain the closure in spite of the stress tending to disengage the closure means and body by reason of the deformation or warping of the latter and in spite of the tendency toward disintegration due to wetting of the inside of the closure by the contents of the container.

A number of the representative objects of the invention have been mentioned above, but other obj cots and advantages will become apparent as the following description of certain present preferred embodiments of the invention proceeds.

In the accompanying drawings I have shown certain present preferred embodiments of the invention, wherein,

Figure 1 is a perspective view of a container with portions cut away to show its construction,

Figure 2 is a vertical cross section through the container shown in Figure 1 and showing the enlarged cream separation space.

Figure 3 is a vertical cross section through a portion of one form of container,

Figures 4 and 5 are fragmentary perspective views of upper portions of containers,

eeann Figures 6 and 7 are fragmentary perspective views in cross section showing upper portions of two forms of container,

Figure 8 is a vertical cross section through an apparatus for sealing containers,

Figure .9 is a perspective view of an ap paratus for sealing containers,

Figure 10 is a. diagrammatic view showing the sealing of a container,

Figure 11 is a central vertical cross section through the bottom portion of a container, the section plane being substantially parallel to the top closure,

Figure 12 is a central vertical cross sect-ion through the bottom portion of the container shown in Figure 11, the section plane being substantially perpendicular to the top closure,

Figure 13 is a perspective view partly in section of a container body having a bottom closure applied thereto but before being filled and before formation of the top closure.

Figure 114 is a cross section through a portion of a container body having one type of bottom closure applied thereto but before being filled and before formation of the top closure,

Figure 15 is a cross section through a portion of a container such as that shown in Fig- 11115114 but after formation of the top closure, an

Figure 16 is a cross section taken at right angles to that of Figure 15.

Referring more particularly to the drawings, there is shown in Figures 1 and 2 'a container comprising a body 2, with which is connected :1- bottom closure 3. The body 2 is made from a substantially cylindrical blank, opposite portions of which are brought together at the top to form a top closure 4. The cylindrical blank is preferably convolutely wound upon a substantially cylindrical mandrel. By reason of the cylindrical shape of the blank, when opposite wall portions are brought together at the top to form the top closure 4, one dimension is greatly reduced and the other dimension correspondingly increased, so that the breadth of the container at the top is greater than its diameter at "the bottom. Although the opposite dimension is small, yet. because of the greatly increased breadth of the container, a

substantial cream separation space is provided at its upper portion. In Figure 2, the

line 5 denotes the separation line between the body of milk 6 and the separated cream 7.

The bottom closure 3, as shown in Figures 1 and 2, comprises a disc. the edges of which are rolled inwardly with the extremity of the body and the body and closure beaded together. The bead supports the closure above the bottom of the container and takes the strain of the contents of the container off of the portions of the body and closure which are rolled together. This form of closure has been found generally satisfactor for most purposes, but the present pre erred form, and the one which most effectively maintains the seal of the container at the bottom in spite of the stresses due to warping and deformation and in spite-of the wetting of the inside of the container by the contents thereof, comprises a pair of cooperating closure members, as will be presently described. The top closure 4 is provided by rolling or turning the doubled container wall upon itself in a manner also to be presently described.

The container is preferably structurally completed substantially coincidentally with the filling of it. Before the container is filled, either the bottom closure must be connected with the container body, or the top closure must be formed. lVhen the bottom closure is first applied, the container is filled through the top and after it has been filled the top closure is made. If it is desired to first form the top closure, the container may be inverted and filled through the bottom, after which the bottom closure may be applied.

I provide apparatus adapted for forming the top closure either before or after the container has been filled. In Figure 8 is shown an apparatus adapted for forming the top closure before filling, and in Figure 9 is shown an apparatus adapted for forming such closure after the container has been filled. Regardless, however, of .whether the closure is formed before or after filling, the closure is complete entirely independently of any applied sealing means, such as the metal strip above referred to.

Referring now more particularly to F igure 8, there is shown a body blank 8 which is placed over a wedge shaped support 9, which may be carried on a movable base 10 in a can-making machine, and automatically positioned by retractable clamping jaws 11. The jaws 11 hold the container body and clamp the upper portion of the container walls at 12, while a curling die 13 is moved downwardly to form the joint. One of the clamping jaws 11 is recessed at 14 to provide for the curling of the joined edges of the body as the die.13 moves downwardly. The extremity of the die is rounded at 15 whereby to reverse the direction of the joined wall extremities and to cause them to curl into the recess 14. After the wall ends have been curled together, a slight additional pressure may be brought to bear upon them by the die 13, whereby to somewhat compress the material together to insure a liquid-tight joint.

After the closure has been formed, the head may be moved to a different position and the tip of an air line applied to an opening 16 in the bottom of the head for blowing the container oil of the support. The'container thus formed will be filled from the flanged cap and forming a suitable closure has a recessed face 22 and is adapted reciprocation 'oint.

1 Referring now more particularly to Figure 9, there is shown an apparatus for forming the top closure of the container, part cularly after it has been filled. The container is held in the position shown by supporting means (not illustrated) and with the upper end open. The container walls are tightly pressed together by clamping jaws 17 working-on stationary guides 18 and actuated by cams 19. It will be noted that the work'- ing faces 20 of the jaws 17 are-corru ated to give a better clamping grip and a so to provide a bead adjacent the end of the container.

Immediately above the working faces 20, the jaws 17 are cut away so as to provide space for a curling die 21. The curlinq pie or in the vertical direction. \Vhen the jaws are first clamped, the edges of the container are in an upstanding position as indicated by chain lines 23 in Figure 4 9. These upstanding edges are engaged by the recessed face 22 of the die 21 and rolled into a joint.

One of the clamping jaws 17 is provided with an upturned lip 24 which guides the edge portions upwardly and insures a tight curl or roll. The contour of the lip 24 on its upper portion is preferably a portion of a circle of the same radius as the completed closure roll.

The apparatus shown in Figures 8 and 9 is designed to make the simplest form of closure, wherein the joined wall extremities are curled and pressed upon themselves. In Figure 9, a small head is shown just below the curled portions. Figure 3 shows a detail of a top closure formed substantially in this manner.

While a joint which is satisfactory for most purposes may be formed without any head or with only a slight'bead, such as is shown in Figures 3 and 9, I prefer to deform the container walls below the rolled portion to additionally strengthen the closure. This deformation may be accomplished by a downward pressure upon the top of the container, producing a closure such as that shown in Figure 5, wherein the neck of the container just below the curled portion is bent sidewise. A somewhat stronger joint is shown in Figure 4, wherein a distinct bead is impressed into the container walls below the curled portion. This bead also relieves the curled portion of some of the strain inciillustrated an apparatus for forming such a closure. The a paratus comprises clamping dies 25 having at faces which cooperate with a vertically movable die 26 having a flat lower face. After curling, the faces of the closure are compressed by the dies 25 and 26 so that the closure finally assumes a configuration with sharp corners. Such a closure is shown in Figure 7, while in Figure 6 a similar closure but having an additional head is shown. The closure of Figure 6 has been found in practice to be the strongest of all those herein disclosed. This is presumably because it not only has the curled portions squared off as above described, but the bead is provided below the curled and squared wall extremities, which has the advantages above noted. a

The top closure may be reinforced by rivets, staples or stitching, if desired. Such means have heretofore been used in connection with folded paper bags, but when used in combination with the container herein disclosed have a still greater reinforcing effect.

Although as above stated the bottom closure shown in Figures 1 and 2 is generally satisfactory for most purposes, I have found that on account of the stresses imparted to the container body by the deformation or warping brought about by joining opposite portions of the body to form the top closure, and on account of the wetting of the inside of the container by its contents, there is a. decided tendency for the container body to pull away from the bottom closure, particularly at the opposite sides thereof corresponding to the flattened faces of the container. The joining of the opposite top edges of the body pulls up the corresponding lower edges so that the bottom of the body instead of being substantially plane and circular is deformed so as to be convex outwardly in the direction transversely of the top closure. Therefore, unless the bottom closure and the container body are very intimately joined there is danger of leakage between them.

The present preferred bottom structure is shown in Figures 11, 12 and 13. In Figure 11 the container body is designated generally by reference numeral 27, opposite portions 28 and 29 thereof diverging from the bottom upwardly. This divergence is brought about by the flattening of the oppositewalls of the body, the effect being substantially the same as in Figure 2. The Walls of the body are interengaged with the edges of a closure disc 30 as shown at 31. The lower extremity of the body is turned inwardly and upwardly about adown-turned flange on the disc 30 so that the body terminates inwardly of the edge of angles to that of Figure 11, the same parts being shown. In this figure, the opposite about by the deformation or warpin of the container body as above described. T eedges of the supplemental disc 32 press outwardly against the inwardly and upwardly turned extremity of the container body and maintain such extremity in intimate contact with the flange of the disc 30. An annular depression or bead33 is formed in the material, and the edge of the disc 32 is seated in such depression to lock the closure. The annular bead 33 being spaced from the disc 30, the edge of the disc 32 is somewhat separated from the disc 30. The discs, however, lie flat against each other at the center of the bottom so that there is a slight spring effect caused by the disc 32, which is under some tension in the horizontal direction. This effect further assists in maintaining the seal of the bottom closure.

Figure 12 is a cross-section taken at right wall portions converge from the bottom upwardly. The effect of such convergence upon the bottom closure may be seen in the figure, wherein the opposite wall extremities are pulled up above the bottom of the container. It .is because of this fact that a tendency exists to disengage the body and bottom closure, and such tendency is overcome by the use of the double disc construction described.

Figure 13 shows a cylindrical body blank to which is connected a double disc bottom closure similar to that of Figures 11 and 12. The inner flan ed disc 34 of Figure 13 is of thinner stock t an the outer flat disc 35, the flange of the disc 34 being held within the upturned extremity of the container body and the disc 35 holding the extremity of the body against the disc 34. The disc 35 lies flat agamst the disc 34 throughout its entire extent instead of being sprung into place as is the disc 32 of the closure shown in Figures 11 and 12. The double wall extremity of Figure 13 is rolled inwardlyto embrace the edge of the disc 35 thereby to insure a tight joint. The container body as'clearly shown in Figure 13 is cylindrical before the top closure is made.

Figures 14, 15 and 16 show a somewhat different form of bottom closure wherein a flat disc 36 is provided on the inside of the container, an outer flanged disc 37 having its flange embraced by the inturned extremity of the body wall. The disc 36 lies on top of the closure thus formed and when the top closure is made there is a tendency to compress the disc 36 which has the effect of more firmly pressing it against the disc 37 and consequently of strengthening the closure. This effect will be seen in Figure 15.

When a closure such as that of Figures 14, 15 and 16 is used the edge of the inner disc 36 will usually be wet by the contents of the'container which will cause a slight expansion of the disc, thereby also increasing the strength of the joint. This expansion will compensate for the slight recession of the opposite portlons of the container wall as shown in Figure 16 due to formation of the top closure, This type of bottom closure is particularly useful in a container for liquids.

The double bottom closure construction serves to greater advantage in acontainer made of a substantially cylindrical body than in one made of a. tapered body. This is because the stress brought about by the deformation or warping of the bottom is greater when a cylindrical body is used than when a tapered body is used. The stress is proportionately less in the tapered body construction because the deformation of the walls is not so great. The top of the tapered body is of smaller diameter than the bottom, and the distance through which the opposite Wall portions must be moved to join them together is much less. This being the case, the stress which is transmitted to the bottom portion of the tapered container is proportionately less than when a cylindrical body is use Consequently, although the double bottom closure construction provides a much stronger container in either case, it is considerably more important when a cylindrical body blank is used.

It is also possible to wind the material upon a tapered mandrel, whereby to form a tapered body blank which would eliminate the longitudinal seam in the tapered type of container.

In fact the container body blank may assumev various shapes within the scope of the invent1on,--f or instance, it may terminate in a rectangular or polygonal bottom closure, the

upper extremities being brought to ether to form the top closure as described. hen containers of considerable length are used, both ends may be closed in the manner herein described with reference to the top closure. This method would be less satisfactory on short containers than on containers whose length is, say, at least four or'five times as great as the diameter of the body blank.

The preferred material of which the container is made is fibrous material or heavy paper. The terms fibrous material and paper as used in the claims include not only t e usual fibrous material used in making socalled paper cans, but also materials such as glassine paper and cellophane. Such materials are ordinarily very thin and not self-supporting, but may be made of sufficient body to be adapted for use in the making of a self-sustaining container as contrasted with a thin paper wrapper. A body, which may be either a single thickness of material or of laminated construction, as above explained, and which has a thickness of from .010 to .030 inches, has been found most satisfactory, as such a body is inherently selfsupporting and strong enough to sustain the seal of the container independently'of metallic clips or other such reinforcing means. When the body is made up of a plurality of plies of material, a single thickness of the 5 material need not necessarily be self-supporting of itself, but there should be enough thicknesses of it to form a self-supporting structure.

In formin the container it is preferable to heat the stoc previous to certain operations. The container body is preferably passedthrou h a heating chamber or in contact with heate rollers so as to bring its temperature up to approximately 100 F. which greatly increases the pliability of the stock. This increased pliability is of considerable advantage in the formation of the top closure especially on account of the sharp fold at the extremities thereof. 4

The body may be dipped into a bucket of water at 110 to 120 F. whereupon the opposite walls are brought together. Heat may also be applied during subsequent steps in the formation of the completed container which will assist in providing a more perfect container. An electrical heatin unit may be used in the forming tools or the heat may be ap lied in any convenient manner.

he ty e of container herein disclosed is adapted or containing powders, which may be ejected through a small opening near the top of the container by periodically compressing the semi-flat sides toward each other, as one would operate a bellows. A small hole may be cut or punctured at an extremity of the top closure, whereby the container may be used for s raying bug powder, kitchen cleanser, and t e like.

When the container is used for containing liquids, a hole may be made in it near the top and a drinking straw inserted, thus enabling the liquid to be drunk directly from the container. If it is desired to completely open the container, a slot may be cut in it near the top, or the top closure may be entirely severed from the body. When the latter method is used, the body may be straightened out into cylindrical form, so that its contents can be drunk as from a tumbler. This is a distinct advantage over the tapered body container, as it is very difficult to drink from a vessel of that shape.

While I have shown and described certain present preferred embodiments of the invention, it is to be distinctly understood that the same is not limited thereto but may be otherwise variously embodied and practiced within the scope of the following claims.

I claim:

1. A fibrous milk dispensing container having a convolutely wound self-sustaining body opposite edge. portions of. which are brought together and rolled together to form a liquid-tight joint.

2. A fibrous container having opposite edge portions of the container walls brou ht together and beaded, the edge portions a j acent the bead being rolled into a closure joint.

3. A self-sustaining container having a convolutely wound body composed entirely of fibrous material and adapted for dispensing liquids having op together to form a liquid-tight joint.

4. A fibrous container comprising a convolutely wound body blank having opposite portions at an end thereof joined to form a closure.

5. A fibrous container com rising a body of generally wedge shape ut having a rounded extremity, the breadth of the generally wedge shaped portion being greater than the breadth of the rounded extremity.

6. A fibrous container havin -opposite edge portions of the container Walls brought together and rolled together to form a joint, the walls of the container bein drawn together between the rolled portion and the container body proper and havin a bead at such portion at which they are drawn together.

7. A self-sustaining container having opposite walls brought together, the outer portions of the walls being deformed to form a joint, portions of the walls between the de formed portion and the body being pressed together, and an additional deformation at such pressed together wall portions.

8. A self-sustaining container having walls converging at an acute angle and turned and re-turned upon themselves to form a joint, the walls between the joint and the body of the container being pressed into intimate contact with each other and having portions thereat which are deformed together.

9. A self-sustaining container of generally wedge shape the convergin walls of which are deformed to form a jolnt, the walls between the joint and the body of the container being pressed together and having a head at such pressed together portions.

10. A fibrous container comprising a body and a separate closure member connected with the bod at one end, the opposite edge portions of t e body being brought together and rolled together to form a joint, the sides of the body adjacent to the joint being pressed into intimate contact with each other and beaded together.

11. A fibrous container comprising a preformed tubular body, a circular closure secured to one end of the body, the opposite edge portions of such preformed body being brought together and rolled together to form a joint, the sides of the body adjacent to the joint being pressed into intimate contact with each other and deformed together.

In testimony whereof I have hereunto set my hand.

' GEORGE O. FROSTAD.

site walls brought

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