Abstract: A molten polypropylene having tacticity expressed in terms of an isotactic pentad fraction of 95 mol % or more is flowed. The molten-polypropylene is cooled to a temperature range of ?200 degrees C. to 50 degrees C. and maintained at the above temperature for 0.1 second to 100 seconds, thereby providing a rapidly-cooled polypropylene higher order structure of which main constituents are a mesophase or monoclinic crystal domain having a size of 100 nm or less and an amorphous phase. The rapidly-cooled polypropylene higher order structure is heated to a temperature range in which endothermic transition occurs and that is equal to or lower than a melting temperature of polypropylene to be heat-treated.

Abstract: A multi-layer structure having two or more layers which comprises a surface layer (a) comprising a thermoplastic resin and having a thickness of 10 to 80 &mgr;m and an adjacent layer (b) comprising a thermoplastic resin or a thermoplastic resin containing an inorganic filler, an interlaminar peeling strength between the surface layer (a) and the adjacent layer (b) being in the range of 0.3 to 2.0 kg/15 mm; and a container comprising this multi-layer structure, wherein the container is excellent in sealing properties, heat resistance and opening properties.

Abstract: There is herein disclosed a multi-layer structure which can suitably be used to manufacture a container in which sealing properties are improved for the prevention of container breakage during sterilization by heating, cooking by heating, distribution or the like and heat resistance is improved for the prevention of container deterioration and which is excellent in opening properties; and a container having the above-mentioned excellent characteristics which comprises this multi-layer structure.

Abstract: Disclosed is an apparatus for thermoforming a thermoplastic blank (10) into a plastic container (1) having a cup-shaped main body (2) with a radially extending flange (3). A blank holder (12) is conveyed by a conveyor (15) along a predetermined path of travel in a predetermined direction. During one circulation, a plurality of blanks are supplied by a blank feeder (16) to the blank holder, a central portion (10a) of each blank is heated by direct contact with upper and lower heating boards (19a, 19b) of heating unit (18) to preferably above a melting point of the blank material, then the heated portion is formed into the cup-shaped main body by a forming unit (20), then a peripheral portion (10b) is annealed by a flange annealing unit (26), and finally the product containers are removed from the blank holder by a pick-up unit (28). The vacant blank holder (12″) is returned to the blank feed station. An annular ridge (3a) or skirt flange (3b) may be formed, preferably at the flange annealing station.

Abstract: A snap-fastener bag according to the present invention is composed of a quadrilateral bag body, a deaerating passage provided along a bottom-seal and a snap fastener provided along the opening. The deaerating passage is provided by configurating a deaerating passage opening as a non-adhesive part through one side-seal and along the bottom-seal and by configurating an adhesive part near the bottom of the side-seal to near the other side-seal positioned at a predetermined interval from the bottom-seal in parallel to adhere between the top and bottom films. A paint film coated with a sticky substance having the kinematic-viscosity of 4-5,000.times.10.sup.-6 m.sup.2 /s (100.degree. C.) such as polybutene is applied in the deaerating passage.

Abstract: An easy-open, hermetically-sealed, packaging bag 1 whose opening end is heat-sealed, with a sealing material interposed therein, wherein the sealing material comprises (a) an intermediate resin strip comprising a low-sealable resin layer and (b) two outer resin strips, the outsides of the outer resin strips being strongly bonded to the inside of the packaging bag by heat-sealing and being weakly melt-bonded to both sides of the intermediate resin strip, the innermost ends of the melt-bonded interfaces between the intermediate resin strip and the outer resin strips are located inner in the packaging bag than the innermost ends of the heat-sealed parts between the packaging bag and the outer resin strips.

Abstract: A multilayer container with a flange for sealing with a lid, wherein the thickness of the inner surface layer at the inner edge of the flange is thinner than that in the sealing area, is produced by a method wherein a circular portion of a multilayer sheet to be the flange is held at a certain pressure while the multilayer sheet is being thermoformed under specified molding conditions, with the other portion than the circular portion being stretched. Even a seal ring having an even surface serves as a means for sealing the resulting multilayer container with a lid while ensuring easy openability.

Abstract: A multilayer container with a flange for sealing with a lid, wherein the thickness of the inner surface layer at the inner edge of the flange is thinner than that in the sealing area, is produced by a method wherein a circular portion of a multilayer sheet to be the flange is held at a certain pressure while the multilayer sheet is being thermoformed under specified molding conditions, with the other portion than the circular portion being stretched. Even a seal ring having an even surface serves as a means for sealing the resulting multilayer container with a lid while ensuring easy openability.

Abstract: A hermetically sealed package comprising:(a) a multilayer container comprising at least an innermost layer and a layer adjacent to the innermost layer, the innermost layer and the layer adjacent to the innermost layer being joined by a pressure sensitive adhesive, the multilayer container including(1) a recessed portion;(2) a flat flange portion adjoining integrally the rim of the recessed portion; and(3) a notch surrounding the boundary between the recessed portion and the flat flange portion, the notch being provided on the flat flange portion in the innermost layer of the multilayer container; and(b) a top film including(1) a lid portion for sealing the multilayer container, the lid portion being adhered strongly to the flat flange portion of the multilayer container at the outside of the notch; and(2) a tab portion for picking the top film, the tab portion extending from the rim of the lid portion, being integral with the lid portion, and being not adhered to the flat flange portion;the coefficient of adh