Toyo Seikan Kaisha, Ltd.

Toyo Seikan Kaisya, Ltd.

Toyo Seikan Daisha, Ltd.

Toy Seikan Kaisha Ltd.

Katsuhiro Imazu

Tetsuo Miyazawa

Tomomi Kobayashi

Akira Kobayashi

Masanori Aizawa

Seishichi Kobayashi

Hiroshi Ueno

Masao Ishinabe

Sachiko Machii

Nobuyuki Sato

Kazuhiro Sato

Toshio Sue

Hiroshi Matsubayashi

Kenichirou Nakamaki

Yoshitsugu Maruhashi

Kazuo Taira

Ikuo Komatsu

Norimasa Maida

Makoto Horiguchi

Hisao Iwamoto

Akihiko Machii

Nobuyuki Satoh

Masashi Ichishima

Yoshiki Takesue

Toshiaki Watanabe

Hiroshi Fujimoto

Koji Yamada

Hideo Kurashima

Yasuji Nakamura

Kouji Suzuki

Yasushi Nishimura

Hiroo Ikegami

Takurou Ito

Yasufumi Tadaki

Naoto Watanabe

Satoshi Fujita

Norihito Saiki

Hiroko Hosono

Shunji Kaneko

Norihiko Saiki

Kenzo Matsui

Yutaka Okunishi

Atsuo Masaki

Harumi Sato

Kenichiro Nakamaki

Masao Miyata

Kazuhiro Satoh

A laminate obtained by laminating a resin composed chiefly of a polyester on a base material, said resin layer having a melt viscosity ratio (R) defined by the following formula (1),

Laminate and container made of the same

A laminate for can-making is disclosed, comprising a metal sheet and a thermoplastic resin layer provided on the surface of the metal sheet. The thermoplastic resin layer comprises a laminate film layer comprising a polyester-base resin intermediate layer (A) containing 10 wt % or more of coloring agent particles, a polyester-base resin outer surface layer (B) and a polyester-base resin backing layer (C). The outer surface layer (B) and the backing layer (C) each contains the coloring agent particles in an amount of 20 wt % or less and at the same time, in an amount less than that contained in the intermediate layer (A). Also disclosed is a process for making a can using the laminate.

Laminate sheet and process for making a seamless can using the same

The process for producing a resin-metal laminate material of the present invention is characterized by comprising providing a heating zone for a metal substrate, a die for feeding a thermoplastic resin in a film form, a pair of temperate laminate rolls for adhering the thermoplastic resin to at least one surface of the metal substrate, and quenching means for quenching the resulting laminate material, along a passage for the metal substrate, supporting and conveying a molten film of the thermoplastic resin from the die with the corresponding temperate laminate rolls and feeding it to a nipping position between the temperate laminate rolls, and fusing the thin film of the thermoplastic resin to at least one surface of the heated metal substrate by means of the temperate laminate rolls. This method can lead to the formation of a uniform and thin-film resin coating on the metal substrate at a high speed, and in addition, the formed resin film has very high intimate adhesiveness and film properties.

Process for producing a resin-metal laminate

A shock resistant seamless can comprising a side wall having an inside surface and an outside surface formed from a laminate of a metal substrate and a thermoplastic resin layer provided on the inside surface of the can side wall, wherein the inner surface of the side wall resin layer opposite the metal substrate comprises a plurality of dotted projections.

Seamless can and process for making the same

The present invention is a packaging material composed of a thermoplastic polyester as a constituent material. By adjusting the contents of a dibasic carboxylic acid and its oligomer derived from the polyester to 500 ppm or less, and adjusting sodium to 6 ppm or less and all alkali metals to 30 ppm or less, especially 20 ppm or less, the flavor retention of the packaging material can be markedly increased.

Packaging material having excellent flavor retention

A method of producing seamless cans wherein a blank holder 2 is inserted in a metal cup 5 coated with an organic film 12, a punch 1 is advanced into a cavity 7 in a die 3 while pushing the bottom 5a of the metal cup onto the flat surface portion 3a of the die by the blank holder 2, so that the side wall 5b of the metal cup 5 is brought into intimate contact with the flat surface portion 3a of the die and with the working corner 3b having a small radius of curvature, thereby to reduce the thickness of the side wall 5b by bend-elongation. Moreover, the portion to be subjected to the necking is ironed at an ironing ratio of not smaller than 5% by the punch 1 in cooperation with the front end 3b.sub.1, of the working corner 3b, or by the front end 3b.sub.1, and an ironing portion of a short cylindrical portion in front thereof, or by the punch 1 in cooperation with the ironing portion 3g of the die 3 by advancing the side wall 5b slightly toward the inside in the cavity 7, thereby to obtain a seamless can 20 having a reduced thickness in the side wall 5b. This method makes it possible to control the thickness distribution in the side wall and, hence, to produce seamless cans having reduced thickness in the side wall permitting the organic film to be least whitened during the necking working.

Method of producing seamless cans

A thin-walled, deep-draw-ironed seamless can comprising a laminate of a metal sheet and a biaxially stretched film of polyester or copolyester mainly comprising an ethylene terephthalate unit. The thickness of the side wall portion of the can is reduced to from 30 to 85% of the original thickness of the laminate. The film layer on the side wall portion of the can has a parallel component orientation (D1) defined by formula (1) of 65% or more and a half width (Wh) of the peak at an angle of diffraction 2.theta. of from 14.degree. to 20.degree. falling within 1.8.degree..

Seamless can

A laminated metal sheet obtained by laminating a polyester film on a metal sheet, wherein the polyester film has a double refraction represented by the following relation,

Polyester-metal laminated sheet and seamless cans using the same

An organic resin-coated seamless can with necked-in portion is disclosed, which is produced by subjecting a resin-coated steel sheet to drawing-re-drawing for reducing thickness or to drawing-re-drawing-ironing for reducing thickness-ironing and which has a ratio of diameter of necked-in portion to diameter of body of 0.9 or less than that, said steel sheet being coated by 5- to 30-.mu.m thick organic resin layer on both surfaces of aluminum-killed, surface-treated steel sheet of 0.01 to 0.13 % by weight in total carbon amount and not more than 6.5 .mu.m in average grain diameter having been subjected to over-aging after continuous annealing to adjust to not more than 10 ppm in solid-dissolved carbon amount. This can scarcely has rough surface or pinholes in the necked-in portion even when the necked-in portion has been considerably compressed upon its formation.

Seamless can with necked-in portion

A polyester laminated draw-formed can which suppresses frothing phenomenon when a carbonated beverage is contained therein and exhibits excellent corrosion resistance, and a coated metal plate used for the production of the cans. The coated metal plate for cans comprises a laminated material of a metal plate, a polyester film layer consisting chiefly of ethylene terephthalate units and, as required, an adhesive primer layer interposed between the metal plate and the polyester film, wherein the polyester film layer that is on the inner surface side of the can has a surface that is molecularly oriented in at least the biaxial directions, and larger protrusions on the surface over a visual field of 100 .mu.m.times.100 .mu.m as observed using an interatomic force microscope (AFM) have an average height (H) of three points of 0.20 .mu.m or smaller.

Coated metal plate for cans and seamless cans formed therefrom

A seamless can obtained by forming a laminated material of a metal and a polyester film into a cup such that a final draw ratio defined by H/D (H:height, D:diameter of the bottom portion) is not smaller than 1.5, wherein a polyester (A) on the bottom portion of the container has a biaxial orientation degree (R.sub.X) of from 2.5 to 20 defined by the following formula (1),

Seamless can and a method of producing the same

A laminated draw-formed container that is obtained by draw-forming a laminated material of a metal plate on which a resin film is laminated into a cup having bottom, wherein said resin film comprises a surface layer of a high molecular oriented copolymerized polyester derived from acid components of 85 to 97% of terephthalic acid and 3 to 15% of isophthalic acid, and a diol component, and a lower layer of a low molecular oriented copolymerized polyester (B) derived from acid components of 84.5 to 96.5% of terephthalic acid and 3.5 to 15.5% of isophthalic acid, the amount of the isophthalic acid being larger than that of the copolymerized polyester (A) of the surface layer, and a diol component, and said surface layer having a double refraction method orientation degree (.DELTA. n) as represented by the following relation,

Laminated draw-formed container having excellent flavor-retentivity and

Container

A laminated sheet metal for the manufacture of containers is made from a sheet metal and, a layered thermoplastic resin film wherein the primer resin includes from about 50 to about 98 weight percent of polyamidodicarboxylic acid-modified epoxy resin, from about 2 to about 50 weight percent of curing agent resin, and from about 0.05 to about 10 weight percent of curing catalyst; also disclosed is a primer resin composition for use in the manufacture of laminated sheet metal for use in the manufacture of containers, made from about 50 to about 98 weight percent of polyamidodicarboxylic acid-modified epoxy resin, from about 2 to about 50 weight percent of curing agent resin, and from about 0.05 to about 10 weight percent of curing catalyst.

Laminated sheet metal for container manufacture and primer used in

A thickness-reduced deep-draw-formed can obtained by using, as the substrate, a cold-rolled steel plate having a carbon content in the steel of 0.02 to 0.15% by weight, a manganese content in the steel of 0.2 to 1.0% by weight, a mean diameter of crystal grain of smaller than 6.0 .mu.m, a tensile strength over a range of from 35 to 55 kg/mm.sup.2, and a thickness of 0.17 to 0.30 mm in a step of subjecting an organic resin-coated structure of the surface-treated steel plate to the thickness-reducing deep-draw forming. This makes it possible to suppress the generation and accumulation of heat in the organic resin-coated steel plate to a level lower than the conventional levels. Therefore, the organic resin coating is prevented from being peeled off or damaged and, as a result, the corrosion resistance can be markedly improved. Moreover, wrinkles can be effectively prevented from developing at the time of reducing the thickness, and the forming can be continuously carried out at a high speed without being substantially affected by the generation or accumulation of heat. It is further possible to easily carry out the post treatments such as necking, flanging and multi-beading after the forming. The thickness-reduced deep-draw-formed can of the invention is effective particularly for preserving various kinds of juices, coffee, oolong tea and any other beverages after it is hermetically sealed, retort-sterilized and reduced for its internal pressure.

Thickness-reduced draw-formed can

Growing community of inventors

Yokohama, Japan

Katsuhiro Imazu