Abstract: Continuous thermoplastic sheeting is manufactured by extruding thermoplastic material from a circular die to form seamless thin walled tubing. This hot, seamless tube is pressed together between a water cooled draw roll and a water cooled elastomerically coated roll to form sheet material which is transparent and without the speckled finish caused by included air.

Abstract: An improved non-detachable end closure has an outwardly facing dome-shaped opening flap. Non-detachable end closures, wherein the rivet for tab attachment is located in the center of the opening flap, may evidence low panel distortion under internal pressure. Forming the opening flap as an outwardly-facing dome provides increased distortion resistance and making the tab ring-shaped permits nesting of the ring in shielded location to prevent accidental opening. The arrangement of a dome within a well, which nests the ring tab, permits locating an expandable securing lug for the tab to the non-detachable dome panel within an upwardly widening space between the dome and interior of the ring tab. The structure makes the ring tab relatively inaccessible and inhibits the tendency of users who are familiar with current detachable ring pull tabs from pulling the tab off and encourages the user to push the tab inwardly.

Abstract: A standard easy-open closure is converted to a child-resistant safety closure by the addition of an insert which is mounted on the rivet between the end panel and the tab. The insert extends beneath the piercing member and prevents cracking of the end panel score. The tab must be depressed, thereby allowing the insert to be rotated from beneath the piercing member, before the closure may be removed. These two additional operations, which must be performed in proper sequence, render removal of the closure beyond the capability of the young child.

Abstract: This invention relates to a method for preparing a collagen casing from a collagen source which had been subjected to a rigourous liming for effectively completely liming the hide collagen. The fully limed hide collagen is soaked in a dilute edible acid having a pH below about 5.5 for a time sufficient to reduce the pH in the center of the hide to about 4 - 5.5, and then washing the neutralized hide with water until the pH of the supernatant after a 20 minute exposure with the hide, is within about 0.2 pH units of that of the incoming water. The hide is then ground and formed into a collagen slurry and processed in conventional manner into edible collagen casings.

Abstract: A laminated film suitable as a food packaging film comprised of a base layer of an oriented polypropylene film, a layer of a vinylidene chloride polymer adhered to one surface of the base layer, a layer of first ethylene/vinyl acetate copolymer having a vinyl acetate content greater than 10 percent by weight adhered to the vinylidene chloride polymer layer and a top layer of a second ethylene/vinyl acetate copolymer having a vinyl acetate content less than 10 percent adhered to the first ethylene/vinyl acetate copolymer layer.BACKGROUND OF THE INVENTION1. Field of the InventionThis application is a continuation-in-part of copending application Ser. No. 81,941 filed Oct. 19, 1970, and now abandoned.This invention relates to an improved packaging film and more particularly relates to a laminated packaging film having low permeability to gases and a method for the preparation thereof.2.

Abstract: Pigmented photopolymerizable ethylenically unsaturated ester compositions used as coatings and printing inks are stabilized to premature gelation by incorporating therein a stabilizing amount of a thiocarbamate compound having the formula ##EQU1## OR A METAL CATION HAVING A VALENCE OF 1 TO 3 AND EACH OF R, R.sub.1, R.sub.2, and R.sub.3 (same or different) are hydrogen, aryl, saturated and unsaturated alkyl groups having 1 to 20 carbon atoms, aralkyl or alkaryl groups having 7 to 15 carbon atoms and amino, sulfo-and oxy-substituted alkyl and aryl groups, n is an integer of 1 to 3 and x is an integer from 0 to 1.