Method for forming a holder (1), by blow moulding, with a wall (3), whereby a preform is pushed against a first and second mould part (10, 11) to form an intermediate form, in which the second mould part (11) is moved and takes the intermediate form with it in order to form an edge (5) between the first and second mould part (10, 11), whereby the mould parts (10, 11) are such that the edge (5) includes a first and second edge part (13, 14)), of which the second (14) is closer to the wall (3) than the first, of which the first (13) makes an angle () to the direction of movement of the second mould part (11) and of which the second (14) makes a larger angle () to it.

A double walled container has a container bottom that is blow molded after an intermediate portion of a parison in the vertical direction is sandwiched by a split mold from the horizontal direction; at least a portion of the container bottom is sandwiched by the split mold; the container bottom has a bottom projection on the underside of the container bottom made of the outer layer of a rigid outer layer container and the outer layer of a flexible inner layer container; in the bottom projection, an extended portion of the rigid outer layer container and an extended portion of the flexible inner layer container have protrusions and recesses of different heights in the horizontal direction; and the protrusions and recesses are combined so that the extended portions of the rigid outer layer container and the flexible inner layer container do not shift vertically with respect to each other.

A blow mold for making PET containers comprising an inner surface corresponding to the outer outline of the container, on which there are one or more cavities or projections configured to make corresponding respective projections or cavities of the outer surface of the container, wherein the mold comprises one or more venting grooves along the edge delimiting said cavities or projections. A plurality of venting holes are possibly arranged along such grooves, as well as it is also possible for some venting holes to be arranged outside thereof. The width and depth of these are selected according to the wall thickness of the container to be blown to prevent that the deformation of the container during the blowing obstructs the venting grooves and leaves visible marks on the container.

A blow mold assembly is disclosed having removable neck insert mold components for forming features of a container for engaging a removable container closure and manually operable retention devices for releasably retaining the neck insert mold components with mating mold components of the mold assembly. Advantageously, each manually operable retention device includes a clamp mechanism movable between a release position and a clamp position by manual operation and the clamp mechanism is effective to resist forces acting on the clamp to move the clamp to a release position when the clamp is in the clamp position. Each manually operable retention device is retained with an associated mating mold component when a neck insert mold component is removed from or installed to the mold assembly.

Provided is a hollow mold which can improve the manufacturing efficiency for a hollow mold including a protrusion. Ventilation duct 3 (hollow mold) includes main body part 20 including hollow part 30 therein, and protrusion 33 protruding outward from main body part 20. End surface 51 of main body part 20 and end surfaces 53 and 55 of protrusion 33 are flush with each other. A cutting operation is linearly performed along the end portion of main body part 20 to the end portion of protrusion 33 in plan view, whereby removal of burr 61 of protrusion 33 to form the end surface is efficiently performed.

A resin fuel tank includes a peripheral wall portion that is configured to structure a portion of a fuel tank main body portion that is made of resin and in which fuel is stored, the peripheral wall portion having a parting line portion that is visible from an outer side of the fuel tank main body portion, and a projecting portion that is solid, is disposed along the parting line portion, and is configured to project outward, integrally with the peripheral wall portion, from the peripheral wall portion toward the outer side of the fuel tank main body portion.

A method for producing a plastic container by internal pressure forming including arranging a hose-shaped preform between the molding dies of a mold, formed having a mold cavity; closing the mold and forming or preforming a container from the preform by internal pressure, wherein a circumferential section of the preform is pressed through a mold gap into a chamber surrounding the mold cavity and is pressed in the chamber against claw pairs having stationary inner retaining claws and movable outer tear-away claws; and laterally moving the outer tear-away claws, causing the circumferential section between the outer tear-away claws and the inner retaining claws to be torn open and the container to be split into two container halves. Also disclosed is a mold suitable for performing the method.

A resin panel includes a first structure and a second structure stacked on each other. The structures includes reference surfaces that serve as the front surface and the back surface of the resin panel respectively. Each of the structures includes a plurality of protrusions protruding inwardly from the reference surface. The protrusions of the structure face the protrusions of the other structure each other. Jutting portions of linear shape are formed between adjacent protrusions of each of the structures. The structures are joined such that apical portions of the protrusions of each structure abut one another.

A blow mold for making PET containers comprising an inner surface corresponding to the outer outline of the container, on which there are one or more cavities or projections configured to make corresponding respective projections or cavities of the outer surface of the container, wherein the mold comprises one or more venting grooves along the edge delimiting said cavities or projections. A plurality of venting holes are possibly arranged along such grooves, as well as it is also possible for some venting holes to be arranged outside thereof. The width and depth of these are selected according to the wall thickness of the container to be blown to prevent that the deformation of the container during the blowing obstructs the venting grooves and leaves visible marks on the container.

A mold for manufacture by extrusion blow molding includes two parts. At least one of the parts includes at least one first section having a first molding surface including at least one primary contact region to form, by pressing, zones for fixing at least one internal component inside a parison, a second section having a second molding surface, the second section of the part of the mold being movable with respect to the associated at least one first section of the part of the mold, and at least one third section movable with respect to the associated at least one first section of the part of the mold, the at least one third section having a third molding surface including at least one secondary contact region to reduce, by pressing, a predetermined volume inside the parison.