US2762381A - Cosmetic container - Google Patents

Description

Sept. 11, 1956 w. c. RAINER 2,762,381

COSMETIC CONTAINER Filed Feb. 1, 1955 2 Sheets-Sheet 1 INVENTOR W'z'lLiam C. Rain er ATTORNEY Sept. 11, 1956 w. c RAINER COSMETIC CONTAINER 2 Sheets-Sheet 2 Filed Feb. 1, 1955 INVENTOR I M2712) cad-Mr BY Q Wfiwfi ATTORNEYS United States Patent QSMET C CONT William C. Rainer, Baltimore, Md assignor to Crown Cork & Seal Company, Inc., Baltimore, Md., a coraer t on of New York pp ic ion F r ary v5.195 Seri l No. 4.85. 63 8 Claims. (Cl. 132-79) Th P se t in ehtiohrelates to a cosme ic con ainer h 1a a plur i y of line s, one of whi h has a m rror surface.

i n o j t o the pres nt inven ion t Provide a s e on a ne w th a line hav ng a mh er surtace.

Ah the obje f th s invention. is. to courle a liner With h nner pr te t ve l ner f the container.

An additional object is to increase the resistance. of the e s f h c aine a a nst pe etra ion o gases fend Water po and wh hetetc e. es s nt e atmqspheric infiltration.

A u r je 0f h n ention s to Provide a iner surface which can be readily freed iron; contents of the container which occur thereon due to ereepage.

A still fur o je of thi in ent on a to pro ide liners. for cosmetic containers which are grease-proof and are also tough and flexible.

Still further objects and the entire ecope. of applicability of the present invention will become'apparen t jrorn the detailed description given hereinafter; it shonld be understood, however, that the detailed description and specific examples, while indicating preferred embodimente of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description.

The present application is. a continuation-impart of my copending application Serial No. 299,142, filed July 16, 1952, now abandoned.

In the drawings, there is shown a preferred" embodiment of the invention.

Figure 1 is a cross section showing a container cover having a mirrored liner therein.

Figure 2 is a cross section showing a container having a protective inner liner attached thereto.

Figure 3 is a cross section showing a container with the coverand mirrored liner in place on the container, the mirrored liner being on top of the proteetive inner liner.

Figure 4 is a perspective view showing the mirrored liner and the cover.

Figure 5' is a cross section showing an alternative form of a container cover having a mirrored linertherein.

Figure 6 is a cross-sectional view similar to Figure 1, but showing a preferred form of the invention, wherein the mirrored liner has a thin coating of a silicone;

Figure T is a cross -sectional view similar to Figure 2, but illustrating they use of a sili'conecoatingon the protective inner liner;

Figure 8 is. a crossrsectional view similar to: Figure. 3, but. show nghe preferred. modification wherein a h n elsilieehe employed.

efe ing to. the dra gs. t. canhe se n t at he ew te tiv nner: liner 2.. h s a. fiat: peripheral. edgene tie l 4 resting penthe edge 6. of. a. con a ne .8 Di h s-ed in: ard y o this. ed e po t n, the pro ct ve litt r. is nre ed ith a depe di ad .0 r efer ly at V- or U-shaped cross, section. The outer side of the bead has a surface 12 which extends inwardly and is inclined in- 1- 2,762,381 Ice Patented Sep 11, 1956 ..1..;.V ..........1 run... an...

Ih r is a o provided a se n plast c l ner 26 aia rla a m lalhzed ra e to form a mirror surface. 28;. The s e and liner is m os ed: toprovld n. nnula Shoulder so bov its p anar eircumte nce and adi ent i s Pe phe y The second liner 2.6 is thus l onditionedito amt snugly it in the similarly contou ed na lkere ess 'the p a ie inner P o ective liner o the ont ner. wh n cl sure s sc ewed into s fina seal ng pos on, aSa hQWB in Figure 3.

- Preferably... the mirro ed ec n lin is P manen y secur d Within the o e s tha wh n the. cover is remo ed, he liner s mme iate y il ble s a mirror- The roun ed ann lar shoul er. on h m r o e l n Prefer bly, p oiects,,a out 0.03 a e ts pla arci ellmfer he r" f f v 11* he mirror Su f e. can be pplied to the Pla ti liner 6 y rn tallizh he su ac th o W h'an nfinitesimal depos t of a um num. sll ei g or-ethe meta to fo m unitary liher- The li er 6 can h uadfe omp et ly gi t of p a t c or. i t e alt rnative, he l ner e h made of a rulphea d cu hion faced it a Plastic. Som t mealt sad htag hs o mploy h a mi r red p ast e I and a separate pulpboard liner which, can serve as a back:-

board liner. I

ferent plastics and both of them or onlyliner 26 need be metallized. Film-forming plastics ingeneialcan be used to formthe plastic liners. Typical examplesof such materials are cellulose esters, e. g. cellulose acetate, thermosetting or thermoplastic synthetic resins, e. g. polystyrene, bilaterally oriented copolyrners o f'styrene with acrylic materials, such as acrylonitrile or methyl methacrylate and bilaterally oriented polymerized methyl methacrylate.

6eliulosic liners have certain defects which influence their dimensional stability, e. g,, due to plasticizer extraction orm-igration and, hence, render them less than ideal.

@ertain-bf the syntheticplastic's,while being suitable as l'i-ner' material, also have defects which render them less than perfect.

It has been found that the difficulties encountered with these and; other materials can be overcome by using bi laterally oriented polystyrene as the plastic in forming mirrored liner 26 and, preferably, in forming inner protective liner 2. The bilaterally oriented polystyrene has superlative characteristics of age stability, grease-proofness, moisture impermeabili-ty, transparency, reflectivity, and rigidity which; together with great toughness, cause it to function as the preferred liner material in the present invention.

Polystyrene, which is not bilaterally oriented, is too brittle to be an ideal liner. it has been discovered that this inherent weaknessin polystyrene can be overcome without the aid of pla-st-ieizer inclusion, which tends to impair its chemical strength, by stretch-orienting the plastic both longitudinally and laterally, so as to increase the original area of said plasticby 900%. Polystyrene, which has been bilaterally oriented in sheet form, manifests, in; relation to uno-riented stock, a crazing strength increase of approximately 400%, and a tensile strength increase of about 200% in the direction of stretch, as weil as induced flexibilityand added toughness; Pure The liners 2 and 25 can be of the same ordif polystyrene sheets, thus modified, have window-like transparency and vibrate with a metallic ring, resembling, paradoxically, metal glass. Liners, fabricated from such bilaterally oriented polystyrene, require ,no modifying components, as opposed to the previous types of cellulose composition and are therefore, more chemically inert and better suited to retain indefinitely the aforementioned qualities and, additionally, are more easily fabricated into the previously disclosed shapes or any of the shapes taught in Patent No. 1,995,350, for example, and will not fracture with usage. Orientation, as applied to plastics, signifies that the molecules have been displaced from a completely haphazard distribution into some more orderly arrangement. Longitudinal orientation produces longitudinal molecular arrangements by reason of the lengthwise stretching of an extruded sheet of uniform cross section in the temperature range where the material is rubbery.

j Lateral orientation develops linear molecular arrangements by reason of the side stretching of an extruded sheet in the temperature range where the material is rubbery.

Bilateral orientation is an expression of the combined laterial and longitudinal stretching of an extruded sheet under controlled temperature conditions. Thestrength of the extrusion is thereby increased in both directions with a corresponding reduction in strength, in the direction straight through the thickness of the sheet where the stress of external forces is the least. The molecules do not change the angle of their extended'contours with re-, spect to the length or width of the sheet but line up into position more nearly parallel to the surface. Bilaterally oriented polystyrene may be produced, to example, by the Plax method, in which the extruded sheet is initially directed through a series of metal cooling rolls (approximately 160 F.) which supplies the necessary tension to the sheet and then travels through an oven at 255 R, which distributes the temperature uniformly over the entire sheet. The sheet next passes to the stretching oven where its travel is accelerated by the side grippets to a speed of 2 /3 to 3 /2 times its delivery to the oven, developing thereby a corresponding longitudinal stretch. Here, it is likewise expanded laterally so that a dual stretch is imparted to the whole. In the stretching oven, the sheet is subjected to a temperature gradient from 240 F. at the entrance to 250 F. in the center area, down to 175 F. at the exit. Finally, the sheet is cooled, trimmed and wound on cylinders. a

By reason of the flexibility and ruggedness imparted by means of bilateral orientation to the otherwise brittle polystyrene film, successful stamping and embossing thereof have been accomplished. Even though stamp ingand embossing are effective at ordinary 'temperational to the operating speed and the temperature of the' die and plastic, it is preferred to use a temperature of 200 F. and an embossing pressure of 10,000'pounds.

subject to change, depending on the speed and the embossing definition desired.

The 200 F. operating temperature is preferred in view of the elastic memory of the polystyrene film. When completely relaxed, the film will remain dimensionally stable at any temperature, unless an external stress be applied. If however, it has been stretched, e. g., through orientation, it tends to resume its relaxed shape and will contract as soon as its temperature is raised to the point where mobility commences, which lies between 210 and 215 F.

Either or both of the liners 2 and 26 can be tinted, e. g., of an eggshell blue or flesh pink color, to add to the saleability of the cosmetic preparation, although, this is not essential. If desired, the protective inner liner 2 can also be metallized.

By employing a dual liner system in the closure-cow tainer combine, the sealing character thereof is proportionately enhanced and the delicate surface 28 of the closure liner mirror is retained unsullied. This is accomplished by having the rounded annular shoulder 30 of liner 26 nest snugly within the ringlike recess 10 of the protective liner 2 in the manner previously described. Thus, there is a close and intimate contact between the liners 2 and 26substantially throughout their entire surface areas. 1

In addition to its other functions, the ring-like recess 10 of the protective liner 2 etfects extended surface contact to engage the inner circumferential wall of the container. As it also receives the annular shoulder of the liner 26 totally within its confines, it serves to complement the strength of the inner seal by virtue of the rigidified contours of the liner couple joining forces and exerting adouble pressure influence downwardly and laterallyagainst the contacting surface areas of the container wall. The intimacy of contact between the specially constructed liners 2 and 26 also functions as an additional sealing aid to insure maximum protection against atmos- 1 tically sided metal cover shell 32 prior to assembly of the inner metal thread'34. Both the liner and metal thread are then locked into position with the aid of inward and upward curling of the raw edge of the'shell extremity as Capillarity has frequently created problems in the packaging of cosmetic creams, emulsions, etc., and there have been various methods proposed to eliminate or reduce this effect. One suggestion has been to provide a cap liner and an inner discwithin the container which arespaced apart sufficiently to break the capillary action.

While the primary purpose of the present invention is to fcnrri'a composite seal including amirror surface and to effect maximum protection of the container contents against theravages of atmospheric oxidation, still, the presentcontainer-closure system is also effective to a considerable extent in reducing capillarity. The rigidity'of the embossed inner liner 2 and embossed cap liner 26 which, .upon engagement-with each other set up radial stresses outward from the rim of annular contact, tends thereby to confine product creepage to the circumferi ential areas. However, if some creepage should develop over the inner surfaces, easy removal of the same can be accomplished by mere wiping of the surfaces of the inner liner and the cap liner carry a minute film of silicone which is a preferred embodiment of the present invention. This "form of invention is illustrated in Fig- The applied pressure of 10,000 pounds, however, maybe ures 6 to 8 which disclose (Figure 6) the use of a minute film of silicone 40 as a coating for the liner 26 and (Figure 7) a similar minute film of silicone 42 as a coating for the liner 2. Figure 8 shows the minute film of silii cone 44 which is a merger of coatings 40 and 42 and which results when the liner 26 is placed in position on top of the liner 2. The silicone, preferably, is employed as a lubricant in cutting and embossing the inner liner and the cap 'liner. The very small amount of silicone thus formed on the surfaces of the liners is effective for the intended purpose. The silicone serves the additional purpose of a destaticizer and also aids in preventing of sticking of the liners to the container or to each other. Various silicones can be used, including the alkyl or alkylaryl', e. g., the polydimethyl siloxanes and various mixed polymethylphenyl siloxanes.

What is claimed is:

1. In combination, a container having an opening therein bounded by a wall having an edge, a first plastic liner disc extending across said opening and having a peripheral portion thereof engaging said edge of the container, an annular surface on said disc disposed inwardly of said edge portion thereof and engaging said wall within said edge and extending downwardly within the opening and inclined away from the wall to form a recess, a second plastic liner disc having a thin metal coating thereon to form a mirror surface, said second disc having an annular shoulder thereon contoured to fit said recess, said second disc removably resting snugly on top of said first plastic disc with said shoulder fitted in said recess, a cover for said opening of greater diameter than the opening and extending across said edge and means to secure the cover to the container.

2. The combination of claim 1, wherein said inclined surface is formed by the outer surface of a depending circular bead formed in the first disc.

3. The combination of claim 1, in which the disc liners are formed of bilaterally oriented polystyrene.

4. The combination of claim 1, in which the discs are coated with a film of silicone.

5. In combination, a cylindrical container having an opening therein bounded by a wall having an edge, a first plastic liner disc extending across said opening and having a peripheral portion thereof engaging said edge of the container, an annular surface on said disc disposed inwardly of said edge portion thereof and engaging said wall within said edge and extending downwardly Within the opening and inclined away from the wall to form a recess, a second plastic liner disc having a thin metal coating thereon to form a mirror surface, said second disc having an annular shoulder thereon contoured to fit said recess, said second disc removably resting snugly on top of said first plastic disc with said shoulder fitted in said recess, a cover for said opening of greater diameter than the opening and extendingacross said edge, said second disc being permanently secured within said cover and means to secure the cover to the container.

6. The combination of claim 5, wherein said inclined surface is formed by the outer surface of a depending circular bead formed in the first disc.

7. The combination of claim 5, wherein said inclined surface is formed by the outer surface of a depending circular bead formed in the first disc and the disc liners are both formed of bilaterally oriented polystyrene.

8. The combination of claim 7, in which the discs are coated with a film of a silicone.

References Cited in the file of this patent UNITED STATES PATENTS 1,592,819 Buschman July 20, 1926 1,995,350 Hoag Mar. 26, 1935 2,358,270 Wild Sept. 12, 1944 2,399,997 Flaster May 7, 1946 OTHER REFERENCES Plastics Technology-Stretch Orientation of Polystyrene and Its Interesting Results, from India Rubber World, May 1948 (pages 225-231). (Stretch Digest.)

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