Abstract: A necked-in and flange portion is formed in the open end of a seamless can body by using a can end holder driven for rotation about its axis, an axially movable inner roll of a reduced diameter disposed adjacent the can end holder, and a spinning roll positioned axially stationary outside the can body. While the can body with the open end telescoped onto the can end holder and in contact with the inner roll is rotated together with the can end holder, the spinning roll is advanced toward the can end holder and forced into the open end, and simultaneously the can body is moved in an axial direction away from the can end holder together with the inner roll, to form the necked-in and flange portion.
Abstract: A method of making a hermetically sealed container is disclosed. In the method, a water vapor (40) is blown into a container body (1) that has been placed with a product such as solid foods or the like leaving a space portion (3). Immediately thereafter or immediately after an inert gas (51) has been blown into the container body, the container body is hermetically sealed. The container has a relatively low negative internal pressure which is controllable with a small range of variation. The water vapor (40) is generated by blowing a non-condensable gas such as air, nitrogen gas or the like at a constant flow rate into a water (13) which is controlled to a constant temperature. When the inert gas (51) is blown, only the surface and its vicinity of the product (4) is heated by blowing the water vapor (40).
Abstract: A pull-tab for an easy-to-open can container is mounted on a lid provided at an opening of a partially-open type container that contains a liquid such as a refreshing beverage. The pull-tab is fixed by a rivet at a predetermined portion of a removable portion surrounded by a score provided on the lid. A dish-like or bowl-like recessed portion is formed around the peripheral edge of a rivet insertion hole of the pull-tab. The peripheral edge of the rivet insertion hole is turned upward along the peripheral wall of the recessed portion to form a horizontally turned portion. A reinforcing edge is provided around the entire peripheral edge of the pull-tab with the exception of the distal end portion at a portion thereof at which the rivet insertion hole is provided. The length of this portion at which no reinforcing edge is provided is made smaller than the outer diameter of the recessed portion. Therefore, it is possible to efficiently prevent the pull-tab coming off the rivet when the container is opened.
Abstract: A metallic container composed of a first and a second section each composed of a metallic cup-like fabricated article having a primer coating, the two sections being lap-bonded at their circumferential open end portions by means of a thermoplastic film-like adhesive. A process for producing said metallic container is also provided which comprises a fabricating step of producing the first and second sections, an adhering step of heat-adhering a film-like adhesive to the peripheral surface of the open end portion of the second section to be laid inwardly, and a bonding step of bonding the open end portions of the first and second sections. In the metallic container, the film-like adhesive, forming a circumferential overlapping portion, is adhered to the edge of the open end portion of the second section and its inner circumferential surface following the edge.
Abstract: A can body of surface treated steel plate, such as TFS, having adjacent longitudinally extending edges of tubular shaped member welded by irradiation of laser beam and provided with inside surface of welded seam having reliable paint retaining characteristic and free from projections, such as upset. For the purpose, welding is carried out such that inside and outside width of molten-solidified zone and structure changed zone will be maintained within a predetermined range and that metallic wire or elongated backing strip is located oppositely to lower surface of both edges being butt-welded.
Abstract: A process and an apparatus for producing a welded can body having an organic coated welded part are provided in which the exposed metal portion on the inside of the welded part of the can body and its vicinity is covered with a tape of an organic resin alone or a mixture of an organic resin with an inorganic material such as a pigment, a metal, etc. The resin tape is entirely supported by a mandrel to be disposed inside the can body, and pressed against the inside surface of the welded part and its vicinity. By heating the welded part of the can body, the resin tape is heated during pressing.
Abstract: A method of making a can body is provided. The method comprises forming a ferromagnetic metal blank into a can body preform having adjacent confronting side edges whose edge faces are spaced, magnetizing the confronting edges to have a reverse polarity to each other, so that the confronting edge faces be attracted to each other and brought into abutting relationship to form an abutting portion, and joining the abutting portion. An apparatus for making a can body according to the method is also provided.
Abstract: A method of making a welded can body wherein the opposite marginal edge portions of a metallic blank are overlapped to form a can body preform with an overlapped portion, and then the overlapped portion is electric-resistance mash-seam welded by using a pair of wire electrodes abutting on both the surfaces of the overlapped portion. At least one of the pair of the wire electrodes is formed with a flat main portion and a marginal projection including a slope contiguous to the flat main portion on the surface thereof, which surface is adapted to abut on the surface of the overlapped portion.
Abstract: There is disclosed a hermetic sealed container filled with a positive pressure generating contents. The container is sealed with a lid comprising a spherical-shaped outwardly protruded panel portion formed with an opening, and a seal tab bonded to the outer surface thereof to cover the opening.
Abstract: A plastic cap is made by introducing an upper plunger formed with a thread groove and a lower plunger into the cavity of a die, while compressing a molten plastic stock between the upper and lower plungers, with the upper plunger sliding along the inner peripheral surface of a holding pad which is held in contact with the upper surface of the die, whereby the skirt portion of the cap is formed by the material of the plastic stock flowing out from between the first and second plungers into between the first plunger and the inner peripheral surface of the die cavity.
Abstract: An easy-to-open lid for a liquid container containing, for example, a refreshing beverage has a lid panel provided with a score line defining a severable area. The lid panel has a rivet integral therewith and anchoring a pull-tab adapted to be pulled by a finger. The lid further has at least one stiffening dimple formed in the severable area of the lid panel such as to resist the bending force applied to a region around the rivet. The dimple is formed as a rib convexed inwardly or outwardly of the container from the plane of the lid panel and extending across the boundary line between the region near the rivet and the other portion of the lid panel.
Abstract: There is provided a method of making a welded can body having a mash seam weld which includes a heat affected zone extending continuously in the longitudinal direction thereof and is formed with no pitting. The weld is formed by mash seam welding a lapped portion of a can body preform made of a surface treated steel sheet while allowing an alternating current to flow through the lapped portion via a water-cooled elongated electrode and a water-cooled rotary electrode. The alternating current has a crest factor satisfying an expression 1.5.ltoreq.Ip/Ie.ltoreq.2.0, where Ie and Ip designate an effective value and a peak value, respectively, of the alternating current.
Abstract: A device for feeding electric power to a roll-like revolving electrode in an electrical resistance welding machine includes a feeder rotor provided in a shaft formed integrally with a revolving electrode and a feeder plate extending in the moving direction of the revolving electrode and disposed in contact with the periphery of the feeder rotor. The periphery of the feeder rotor is electrically coupled to the electrode surface of the revolving electrode, and the feeder plate is connected to a power supply. Consequently, the electrode surface of the revolving electrode is electrically coupled to the power supply.
Abstract: An apparatus for supporting an elongated ram which is adapted to reciprocate horizontally at a high velocity is provided. The apparatus comprises a slide yoke fixed onto the base of the ram for driving the ram, the slide yoke comprising at least two sets of hydrostatic pressure sliding oil pockets in the longitudinal direction thereof; and a hydrostatic pressure bearing for supporting the ram, the hydrostatic pressure bearing having at least three sets of oil pockets in the longitudinal direction thereof which are spaced with bushings therebetween.
Abstract: An ironing apparatus for forming a cup-like metallic article such as an one-piece metallic can body is provided. The apparatus comprises a punch provided on a tip of a ram adapted to reciprocate in the horizontal direction and a plurality of ring dies cooperating with the punch. In the apparatus, the punch reciprocates such that the center of the end face thereof moves along a locus curved downwardly with the gravity, and the die is disposed to be slightly inclined with respect to a vertical plane such that the axis of the die extends substantially in the tangential direction of the locus at the location of the die.
Abstract: There is provided a method of making a metallic container having a predetermined or standard height and a circumferential seam of the type which is formed by fitting a first open end portion of an upper can body having a venting portion and a second open end portion of a lower can body having a bottom portion to each other with a heat sealable adhesive layer therebetween to form a metallic container preform having a fitted portion, and heating the fitted portion thereby to fuse the adhesive layer.
Abstract: An improved apparatus for producing welded metallic can bodies is provided. The apparatus has two roll-like revolving electrodes and an elongate electrode, and the lap portions of two can bodies are disposed respectively between the two revolving electrodes and the elongate electrode. An alternating current flowing through these lap portions is supplied by coupling the two revolving electrodes to an ac power supply, or by dividing the elongate electrode into two electrically insulated portions and coupling these portions to the power supply.
Abstract: In a method for laminating a film of a synthetic resin to the surface of a base metal, the improvement which comprises coating an adhesive synthetic resin powder either as such or as a dispersion in water or in a low-boiling organic liquid on said metal surface and heating the coating to melt the powder, or directly coating said synthetic resin powder in the molten state on said metal surface, thereby to bond the synthetic resin powder thereto, superposing said film of synthetic resin on the resulting coating, heating the assembly under pressure, and then cooling the resulting laminate.
Abstract: In a redrawing-ironing apparatus provided with a punch fixed on a ram, a die means including a redrawing die and ironing dies, an annular piston for fastening the die means, a cup retained pad adapted to push the inner periphery of the bottom of a drawn cup placed on the redrawing die, and pins fixed on the annular piston and extending axially, the free end surface of the pin is engaged with the flange of the cup retainer pad at the end of the redrawing. As a result, the earing portions of the drawn cup can be prevented from being thinned and broken into fragments at the redrawing.
Abstract: Disclosed are a method of and apparatus for making a welded metallic can body by effecting a mash resistance welding on a lapped side portion of a can body preform by means of a combination of a cooled elongated electrode and a cooled rotary electrode and, as required, with wire electrodes interposed between the lapped side portion and these electrodes. Also, disclosed are a tinfree steel welded can body and its making method wherein it is formed by a mash resistance welding on a lapped side portion of a can body preform made from tinfree steel, without requiring the removal of surface chromium film from the welded portion and its vicinity.