A method and apparatus for the formation of double-walled containers with the structure of two integrally connected and adjacent containers extending in the same direction with an air gap between them, stretch-blow moulded as single bodies out of thermoplastic material, and suitable for mass-production. A thermoplastic tubular blank is formed and then heat-conditioned. The heat-conditioned tubular blank is then mechanically stretched longitudinally and blow-formed outwards by gas pressure to conformingly and stretchingly assume the tubular blank to the shape of a first dual-container shaped mould cavity set in order to form a stretch-blow moulded first container integrally connected to a second container, with both containers extending in opposite directions. Next, additional heat-conditioning is applied to further heat-condition as necessary the stretch-blow moulded second container and if deemed an advantage, at least part of the first container. Then at least one profiled inversion piston shaped as a male mould member with an outer surface configuration that defines the inner surface configuration of the article being formed and a second container shaped mould cavity set with a single-container shaped configuration are provided along with one or more wall stability devices which are applied to at least part of the wall surface(s) of either or both of the two integrally connected stretch-blow moulded containers, such that the second smaller container side wall(s) are at least substantially not in contact with the second container shaped mould cavity set and may be inverted at least partially inside-out, while at the same time the second smaller container bottom wall at least substantially does not invert, in order for the second smaller container to become a substantially mirror-image inverted second smaller container extending in the same direction as, and interior to, the first container.

The present invention relates to a disposable folding paper cup that folds flat and, when unfolded by the pressing of a folded portion, has a cylindrical upper end, the paper cup comprising: a cup body, which is made of a coated paper of which the inner surface is coated with a cup body coating layer, forms a cylindrical shape when unfolded, and forms a flat surface when both sides thereof are folded at folding lines; bending lines forming oval press parts that unfold bisymmetrically around each folding line when the folding line height center portion of the cup body is pressed, and dividing the oval press parts, spaced from the upper and lower ends of the cup body, therefrom; a bottom sheet which is a coated paper having a bottom sheet coating layer formed on the surface thereof so as to be fused with the cup body coating layer at the inner side of the lower end of the cup body, of which both ends are primarily fused therewith while the bottom sheet is folded along a transverse center folding line that is upwardly convex, and which is fused with the bottom edge of the folded cup body to form a bottom fused band; and fusion columns at which the front and rear surfaces, having the folding line at the center thereof, and the bottom sheet, having the end portion fitted therebetween, form a column shape higher than the fusion height of the bottom fused band and lower than the lower end of the bending line, thereby fusing, at a portion at which the bottom fused band and the folding line meet, the end portion of the bottom sheet through the three sides altogether.

A collapsible receptacle, such as a beverage cup, that is reconfigurable between expanded and collapsed configurations with an inner sleeve with first and second opposed major walls divided by opposed fold lines, an outer sleeve with first and second opposed major walls divided by opposed fold lines, and a liner retained by the inner and outer sleeves. The receptacle is retained in an expanded configuration when the opposed fold lines of the inner and outer sleeves are not aligned, and the receptacle can be collapsed when the opposed fold lines are aligned. A lid can be removably retained by a retaining ring. The opposed fold lines of the inner and outer sleeves can be disposed in groups, such as groups of two fold lines, so that the sleeves have opposed minor walls. The major walls can taper in thickness from their mid-portions to the opposed fold lines.

Embodiments of the present invention provide a cover of a collapsible cup. According to one embodiment, a device comprises a cover for a cup, the cover comprising a lid having a periphery, a peripheral wall extending from the periphery of the lid generally oblique or perpendicular to the general orientation of the lid, and a compartment attached to or formed within the lid, the compartment forming a unitary structure of the lid and the compartment, wherein the compartment extends beyond the periphery to create an overhang portion of the compartment beyond the lid.

A foldable silicone cup includes a foldable cup body and a cap. The foldable cup body includes a middle portion, an upper portion, a lower portion, and a foldable configuration. The silicone cup can be folded for carrying conveniently and saving space. A waterproof ring is provided between a cap body and a lid of the cap to ensure that the circuit inside the cap won't be damaged due to water. The inner side of a cup mouth is provided with a sealing ring to provide a sealing effect.

A collapsible, reusable drinking container is provided having a first opening suitable for pouring and filling, a second opening for accessing the interior of the container for cleaning, and a flexible straw for drinking the contents while the container is held in an upright position. The first opening is reversibly sealed with a cap, the second opening with an interlocking ridge and groove fastener, and the straw is reversibly sealed using a plug, a cap, a push-pull cap, a reversibly discontinuous portion of the straw, or an element for reversibly kinking the straw. The straw is attached to the container wall, to the cap for sealing the first opening, or to the fastener for sealing the second opening.