US2305494A - Milk bottle cap - Google Patents

Description

De. 15, 1942. I J. F. PRICE MILK BOTTLE CAP Filed Jfine 24-, 1940 array/rem.

- materials.

Patented Dec. 15, 1942 UNITED STATE 2,305,494 mm no'r'rm car JohnF. Price, Fulton, N.

Falls Corporation, Fulton, N.

of New York Y., asslgnor to Oswego Y., a corporation Application June 24, 1940, Serial No. 342,108

ZClaims.

This invention relates to bottle caps of the hood type formed of fibrous material such as paper board. These caps are usually formed from a disk of sheet material with the marginal portion of the disk contracted about the top of the bottle in folds of pleats which are adhesively secured together. Inview of the fact that the fibrous material readily absorbs an appreciable amount of moisture, such caps become loosened on the tops of bottles unless the cap is coated or impregnated with some material to render the same impervious to moisture. This coating usually consists of a wax, such as paraffin. However, the paraflin coating has several disadvantages. Certain lacquers and thermoplastics, such for example as copolymer of vinyl chloride and acetate, are preferable to paraflin in that they form-an impervious coating and also serve as an adhesive to secure the pleats of the cap in contracted condition. These substances are known as wetting That is, certain liquids have a strong adhesion to these materials. I have found that if the under surface of the caps are coated with such materials, any liquid or moisture which may collect at the bottom edge of the cap passes upwardly between the tightly contracted skirt of the cap and the glass bottle by capillary. attraction resulting from the adhesion of the moisture with both the under surface of the coated cap and the glass surface of the bottle. The obiection of such creepage is that moisture on the outside of the bottle neck may be unsterile with the result that when it passes upwardly to the pouring lip of the bottle, an unsanitary condition is effected.

This invention has as an object a paper hood bottle cap embodying a construction whereby the outer surface of the cap is impervious to moistu're, the folds or pleats of the skirt portion of the cap are adequately secured together in overlapping relation, the underside of the cap in contact with the top of the bottle protected from the absorption of moisture, and 'the skirt por-' tion of the cap being constructed so as to prevent capillary attraction of outside moisture upwardly between the skirt of the cap and the bottle neck.

The invention consists in the novel features and in the combinations and constructions hereinafter set forth and claimed.

In describing this invention, reference is had to the accompanying drawing in which like characters designate corresponding parts in all the views.

Figure l is a side elevational view. partly in section, of a cap embodying my invention and a contiguous portion of the bottle neck.

Figure 2 isa bottom plan view of the cap shown in Figure 1 illustrating the arrangement of the coating on the inner or under side of the cap.

Figure 3 is an enlarged fragmentary view taken on line 3-3, Fi e 1.

The cap illustrated is formed of paper board and is here shown in the nature of a circular blank or disk III, the marginal portion of which is scored or folded to form pleats H which assume an overlapping relation when the cap is applied to the bottle. The entire outer surface of the cap is coated with an impervious moistureproof material l2. Preferably, this coating is a thermoplastic adhesive which also serves to secure the pleats VII in overlapping condition.

In order to prevent the absorptionof any moisture that may be present on the top of the bottle when the cap is applied thereto, I also coat the under side of the central 'or discoidal portion of the cap with the thermoplastic resin as indicated at l2. In the event any milk should be present on the top edge of the bottle when the cap is applied thereto, the same acts more or less as an adhesive when dry, with the result that the under side of the cap is more or less adhered to the top edge of the bottle, and when the cap is subsequently removed fibers or threads are likely to be torn from the paper, whereby an unattractive and undesirable surface is presented over which the contents of the bottle must be poured. The coating ii on the under side of the discoidal portion prevents any such possibility.

The under side of the pleats II is also coated as at l3 with the same material with which the outer surface of the cap is coated. The coatings serve the dual purpose ofpreventing absorption of moisture in thepleated portions II and in additionally securing the pleats in overlapping relation. The remainder of the under side of the skirt, including the portions ll intermediate the pleats, is uncoated. This uncoated area functions to absorb any moisture in contact therewith and this absorption is sufllcient to prevent capillary attraction of the moisture upwardly between the skirt of the cap and the neck of the bottle. With this arrangement, the cap is rendered impervious to moisture to the extent that the adhesively secured pleats II will not open up to permit the .cap to become loosened upon the bottle. At thy same time, the top edge ofthe bottle is maintained in a sanitary condition.

- What I claim is: J

1. A milk bottle cap formed from paper board 10 tively absorbent.

comprising a discoidal portion extending across the top oi the bottle and a depending skirt formed with overlapping portions and encircling the top of the bottle, the entire outer surface of the cap and the under side of the discoidal portion and said overlapping portions being coated with a thermoplastic resin to render the same impervious to moisture, and the remaining arena! the under side of the cap being uncoated and rela- JOHN F. PRICE.

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