Described are a mold and molding process for manufacturing devices and containers that are scalable, modular, and lockable laterally and vertically with other like devices or containers. The mold is formed with a cup mold and top end mold sections specially designed to allow for molding and demolding a container with an undercut. The cup mold includes, on a vertical wall, one or more undercuts. Multiple undercuts may further form tongues with undercuts each of which forms a groove with undercuts on the molded article, and/or one or more grooves with undercuts each of which form a tongue with undercuts in the molded article. Molding and Demolding of the article with undercuts is further enabled by utilizing an improved method of molding said article with an undercut, and demolding said article from the mold once it is molded, by improvements to each stage of the molding process, including the preform stage, the conditioning station stage, the blow stage and the release stage.

Method for processing hot-filled plastic containers are provided. In some embodiments, the method may include hot-filling a plastic container, sealing the container, and conveying the sealed container, each with an inner annular wall and a push-up portion in a first position. In some embodiments, the method may further include creating a vacuum pressure in the hot-filled and sealed container and repositioning the push-up portion from the first position to a second position under a mechanical force.

The invention relates to a blow-molded recipient including a reservoir, the reservoir having a bottom wall including an opening, a central element arranged at the opening of the reservoir, and a socket arranged to surround the central element. Both the socket and the central element show a lower end and an upper end and are connected by their respective upper ends by a disc with a central aperture. The assembly includes the socket, the central element and the disc, forming a ring that comes into one piece. At least a part of the bottom wall of the reservoir is arranged to face the disc. The reservoir is irreversibly fixed to the ring.

The invention relates to a blow-molded recipient including a reservoir, the reservoir having a bottom wall including an opening, a central element arranged at the opening of the reservoir, and a socket arranged to surround the central element. Both the socket and the central element show a lower end and an upper end and are connected by their respective upper ends by a disc with a central aperture. The assembly includes the socket, the central element and the disc, forming a ring that comes into one piece. At least a part of the bottom wall of the reservoir is arranged to face the disc. The reservoir is irreversibly fixed to the ring.

In one example, a method includes positioning, within a mold, a device with a movable element that defines a portion of a volume, and the volume is contained within the mold, as part of a molding process, at least partly defining a molded watercraft by introducing plastic into the mold, disposing the plastic about the movable element, and with the movable element, excluding the plastic from the portion of the volume that is defined by the movable element so as to define a recess and an undercut that are integral with the watercraft and extend lengthwise with respect to a centerline of the watercraft, and the recess and undercut are integral, and communicate, with each other.

In one example, a method includes positioning, within a mold, a device with a movable element that defines a portion of a volume, and the volume is contained within the mold, as part of a molding process, at least partly defining a molded watercraft by introducing plastic into the mold, disposing the plastic about the movable element, and with the movable element, excluding the plastic from the portion of the volume that is defined by the movable element so as to define a recess and an undercut that are integral with the watercraft and extend lengthwise with respect to a centerline of the watercraft, and the recess and undercut are integral, and communicate, with each other.

An apparatus for blow-molding plastic containers includes at least one blow-molding station which defines at least one molding cavity which extends around a main axis of extension and further includes at least two lateral bodies and a respective bottom for each molding cavity that is defined by the blow-molding station. The bottom defines a recessed central portion, which is arranged around the main axis of extension, and a lateral containment portion, which has petal-shaped regions which have a substantially radial extension.

The invention relates to a recipient comprising a reservoir, the reservoir having a bottom wall comprising an opening; a central element arranged at the opening of the reservoir; a socket arranged to surround the central element; wherein both the socket and the central element show a lower end and an upper end, and are connected by their respective upper ends by means of a disc with a central aperture, wherein the assembly comprising the socket, the central element and the disc is forming a ring that comes into one piece; in that at least a part of the bottom wall of the reservoir is arranged to face the disc and in that the reservoir is irreversibly fixed to the ring.

A plastic container has a mouth portion, a main body, and a base portion which adjoins the main body. The base portion has a central region as well as a diaphragm which runs in a circumferential direction and extends from the central region to the main body. The central region is pivotable relative to the main body between at least two positions which differ with regard to an internal volume of the container. The wall has at least one and preferably at least two circumferential grooves and are spaced apart from one another. The central region has a projection extending in the direction of the interior of the plastic container, and at least one web extending at least in part in a radial direction in the circumferential wall.

The disclosure relates to a fuel tank including a tank wall which has at least two wall sections opposite one another and a stiffening device situated between the two opposite wall sections. The disclosure further relates to a method for manufacturing such a fuel tank. According to the invention, it is provided that the stiffening device includes at least one connecting strut, each end of which has a profile section, which engages with one complementary profile section each on the two opposite wall sections of the container wall in a tension-resistant manner in such a way that the connecting strut absorbs compressive forces acting on the container wall. The method according to the disclosure for manufacturing a fuel tank including a stiffening device of the aforementioned type is characterized by the following steps: shaping the tank from a thermoplastic material in a blow mold, at least two coupling sections being created on opposite wall sections and an opening being created in one of the wall sections; removing the container from the blow mold; manual or mechanical insertion of at least one connecting strut via the opening into an interior of the container, the ends of at least one connecting strut each including a profile section, which may be coupled to one of the coupling sections of the wall sections in a tension-resistant manner; and manual or mechanical coupling of the profile sections of the connecting strut to the coupling sections of the wall sections.