Abstract: A plastic bottle has as a wall-forming component a layer of a copolymer consisting essentially of 99 to 70% by weight of vinylidene chloride and 1 to 40% by weight of at least one acrylic or methacrylic monomer and further including up to 100 parts by weight of at least one member selected from other ethylenically unsaturated monomers per 100 parts by weight of the total amount of the first two monomers, the copolymer having an oxygen permeability constant of less than 9.times.10.sup.-14 cc.multidot.cm/cm.sup.2 .multidot.sec.multidot.cmHg as measured at a temperature of 20.degree. C. and a relative humidity of 100% and a water vapor permeability constant of less than 3.times.10.sup.-3 g.multidot.cm/m.sup.2 .multidot.day as determined according to the method of JIS Z-0208.This plastic bottle is obtained by casting an aqueous latex or the like of the above-mentioned copolymer in a bottle mold and drying the cast latex. This aqueous latex may be formed as a coating layer on a preformed plastic bottle.

Abstract: Disclosed is a process for the preparation of cans which comprises pressing a flexible lid comprising an aluminum foil as a substrate and a heat-sealable resin layer formed on the surface thereof to a metallic can body being formed of a surface-treated ferromagnetic steel plate and having a curl on the edge of an opening in such a positional relation that the curl portion of the can body confronts the resin layer of the lid, and induction-heating the curl portion selectively by a high-frequency induction-heating coil located in the vicinity of the periphery of the curl portion to form a seal between the curl portion and the lid by heat-sealing. According to this process, the curl portion to be heat-sealed is selectively heated, and heat-sealing can be accomplished in a short time while preventing deterioration of a lacquer or sealant.

Abstract: A polyester film-heat-bonded metal sheet is provided, which comprises a biaxially oriented polyester film or films, heat-bonded to a metal sheet by means of an adhesive layer interposed therebetween. The adhesive layer is made of a polyblend comprised of, based on the weight of the polyblend, 5 to 80 wt. % of at least one high melting point polyester having a melting point of at least 200.degree. C. and 20 to 95 wt. % of at least one low melting point polyester having a melting point of at least 100.degree. C., but not higher than a temperature which is 5.degree. C. lower than the melting point of the high melting point polyester. The polyblend may contain a minor amount of a polyolefin resin. The polyester film-heat-bonded metal sheet has good formability and is suitable for cans and other containers. The containers exhibit enhanced impact resistance, adaptability to retort treatment and corrosion resistance.

Abstract: While a portion of a blank made of molecularly orientable plastic resin, which is to be formed into the flange portion of a cup-shaped container, and another portion of the blank, which is to be formed into the bottom wall portion of the container are individually compressed at the molecularly orientable temperature, the portion to be formed into the bottom wall portion is introduced into a die cavity, to form the side wall portion of the container with the material extended by the compressing operation, thereby to form a cup-shaped container with a flange portion.

Abstract: An easy open can cap has an elongated tear strip defined by a main score and a ring pull tab attached to the tear strip by a rivet. A bending score is provided on the tear strip near the rivet, the bending score extending perpendicular to a longitudinal extending center line of the tear strip so that when the ring pull tab is initially lifted, the tear strip bends at the bending score to thereby reduce the applied force necessary for initiating opening of the tear strip. The main score has a starting end portion extending partially around the area of said rivet and a terminating end portion at the opposite end of the tear strip, the main score having a transitional portion between the starting end portion and the terminating end portion with the transitional portion having a thinner score residual than that of the starting end portion.

Abstract: A cap adapted for use as a container cover where the cap has a thermoplastic resin liner pressed formed onto the inner surface of a cap shell. The plastic liner is formed such that the difference between the intrasurface orientation index of the outer peripheral portion of the liner and the intrasurface orientation index of the central portion of the liner does not exceed 0.37 where the intrasurface orientation index is defined as the sum of the orientation coefficient of the liner in the radial direction and the orientation coefficient of the liner in the circular direction.A method of making a cap having a thermoplastic liner where the liner is press-formed into shape under conditions whereby the difference between the intrasurface orientation index of the outer peripheral portion of the liner and the orientation index of the central portion of the liner does not exceed 0.37.

Abstract: A continuous heating apparatus for metal caps having at least one pair of high frequency electric conductors where the conductors are separated by an interval smaller than the diameter of the bottoms of the caps to be heated. A guide panel is spaced from the conductors and is adapted to engage the open end of the metal caps when the caps are moved away from the conductors towards the guide panel due to the repulsion effect occurring between the high frequency current in the conductors and current induced in the caps. A transport device moves the metal caps relative to the conductors.

Abstract: Disclosed is a method for assaying an iron-exposed portion of a coated steel plate or a processed product thereof, which comprises bringing a surface, to be measured, of the coated steel plate or processed product thereof, a reference electrode and a counter electrode into contact with a buffer solution having a pH value of from 9.0 to 11.0, effecting in this state electrolysis between the counter electrode and the coated steel plate or processed product thereof under such conditions that the voltage of the coated steel plate or processed product thereof to the reference electrode is 0.8 to 1.5 volts as calculated as a saturated calomel electrode, and evaluating the iron-exposed portion by measuring an electric current flowing between the counter electrode and the coated steel plate or processed product thereof or by observing precipitation and deposition of an oxide or hydrated oxide of iron.

Abstract: A method of manufacturing peelable adhesive structures. It comprises preparing a first paint solution containing vinyl resin and a stably emulsified hydrocarbon or natural resin having softening point less than 180.degree. C. and concentration between 50 and 200 parts by weight per 100 parts of vinyl resin dispersed in a continuous phase of the vinyl resin. The first paint solution is applied onto a metal base material (1) to form a first coating layer (2). A second coating layer (3) is formed by applying a second paint solution containing epoxy resin and polyethylene oxide at a concentration of between 0.5 and 90 weight percent of epoxy resin over the first coating layer. The first and second coating layers have thicknesses ranging from about 0.5 to 100 mg/m.sup.2. A layer of olefin resin (4) is joined to the second coating layer.

Abstract: A metal cap having a primer layer thereon which has a thermal adhesiveness with respect to a lining layer and wherein part of the lining at the bottom of a cap is thermally adhesively fixed to the primer layer.A method of manufacturing a metal cap including steps of applying a primer to the cap which has a thermal adhesiveness with respect to a lining layer and heating only a portion of the bottom of the cap to cause only part of the lining to become affixed to the primer.

Abstract: Disclosed is a paint for a can which comprises an epoxy resin component formed by condensation of a dihydroxyl compound with an epihalohydrin and a curing agent component, said epoxy resin component containing terminal .alpha.-glycol groups at a concentration of 0.05 to 0.60 equivalent per Kg of the resin.This paint provides a coating capable of retaining a high adhesion even with the lapse of time and resisting a severe treatment such as retort sterilization.When this paint is applied to a bonded can, leakage of the content from the side seam with the lapse of time can be effectively prevented. When this paint is applied to a can provided with an easy-open can lid, occurrence of the enamel feather can be prevented at the time of opening the lid.

Abstract: A high frequency induction heating apparatus for heating articles where the apparatus has a heating station, a source of high frequency current including a vacuum tube oscillator means and a plurality of high frequency electric conductors which extend through the heating station and which are connected to the source and to ground. The conductors are series connected such that one-half of the conductors form inflow conductors positioned adjacent one another in one-half of the heating station and the remaining one-half of the conductors form outflow conductors positioned adjacent one another in the remaining one-half of the heating station. Conductors connected closer to the source are positioned further from the article to be heated than conductors connected closer to ground in order to prevent dielectric breakdown between the conductors and the article to be heated.

Abstract: Adjusting method and apparatus for a cylindrical article peripheral surface coating machine characterize in that a coating clearance between a coating roller and a cylindrical article fitted over each mandrel on a travelling mandrel conveyor, the coating clearance being formed for allowing the coating roller to be brought into rolling contact with the cylindrical article when the latter has entered the coating zone, a transfer clearance between the coating roller and a transfer roller formed for allowing the latter to be brought into rolling contact with the former, and a receiving clearance between the transfer roller and a fountain roller formed for allowing the latter to be brought into rolling contact with the former, are made adjustable each independently without affecting each other.

Abstract: A process for manufacturing a closure cap having a liner. A mass of molten thermoplastic is positioned in the inner face of a cap shell. The mass is spread by a heated punch and the spread mass is then formed by a cooled punch to the final liner shape.

Abstract: An internal pressure inspecting method and system for determining the degree of unevenness of the surface of an elastic cover of each of one or more hermetically sealed containers, the unevenness being produced according to the internal pressure. The distance from a fixed position exterior of the hermetically sealed container to said cover surface is determined by measuring the change in inductance utilizing the action of electromagnetic induction, at a plurality of points i.e. the center and peripheral portions thereof. A value is derived by calculation of the difference between a mean value of both measured values at any one point in the peripheral portion and at the position on the diametric line which is in symmetrical relation therewith with the center of the container cover as the center of symmetry, and the measured value at the center of the container cover. The internal pressure of said hermetically sealed container is determined from this value.

Abstract: Disclosed is a retort-sterilizable laminated pouch having an excellent loading pressure resistance, which comprises two laminated sheets, each comprising a flexible gas-barrier substrate and a heat-sealable crystalline olefin resin layer formed on one surface of said substrate, said laminated sheets being piled in the form of a pouch where the olefin resin layers confront each other and the periphery of the pouch of the piled sheets being heat-sealed, wherein the crystalline olefin resin layer is composed of polyethylene having a flow ratio (Kp), defined by the following formula, of at least 165: ##EQU1## wherein MI.sub.2 stands for the melt index (g/10 min) as determined according to the condition E of ASTM D-1238 and MI.sub.20 stands for the melt index (g/10 min) as determined according to the condition E of ASTM D-1238 except that the load is changed to 20.0 Kg and the sample collecting time is changed to 30 seconds, and a density of at least 0.935 g/cc.

Abstract: A container cap having a coated metal shell. A peelable adhesive layer joins a liner to the shell. The peelable adhesive layer comprises a local coating resin layer having a diameter less than that of the metal shell and a layer of an epoxy resin.

Abstract: A high frequency induction heating circuit for heating a plurality of articles where the heating circuit has a semiconductor oscillation circuit which includes a series resonance circuit having a heating coil and a condensor. A detection circuit for detecting changes in impedance and frequency variations in the heating coil is included as well as a current control circuit which is responsive to the detection circuit. A varible control gain regulation apparatus is included in the current control circuit such that current supplied to the coil becomes a non-constant current control depending on the number of articles to be heated.

Abstract: An apparatus for dispensing and molding lining material into metallic cap shells. The apparatus has a conveyor mechanism for conveying shells from a shell supply station to a lining material dispensing station and then on to a shell transfer station including a molding mechanism for molding lining material in the shells. An induction heater heats the shells moving from the supply station to the lining material dispensing station and from the dispensing station to the shell transfer station.

Abstract: A high frequency induction heating apparatus having a heating station and transport means for moving an article to be heated through the heating station. A pair of high frequency electrical conductors are contained in the heating station and are connected to a source of high frequency electrical current such that high frequency current will flow through the conductors in mutually opposite directions. The conductors are inclined or tapered with respect to the path of movement of the article through the heating station to assure that the complete area of the article facing the conductors is heated during its movement through the station or to vary the temperature gradient of the area facing the conductors. Ferrite cores may be included on the side opposite the conductors from the article to be heated in order to increase heating of particular areas of the article.