A method for renovating the interior of a hollow structure such as a sewerage pit (1) is described. The method provides an access opening (16) to the hollow structure (1); provides a plurality of material sheets (3) comprising reinforcing fibers and a curable resin composition through the access opening (16) and against a wall (11a, 11b) of the hollow structure (1); and provides an inflatable pressure means (4a, 4b) within the hollow structure (1). The pressure means (4a, 4b) are inflated against the wall (11a, 11b). A curing means (6) is then provided within the hollow structure (1) for curing the resin composition; and the resin composition is cured to harden the material sheets and provide a renovated interior of the hollow structure (1).

A plastic container and a method for producing a plastic container for liquids, in particular an inner container for transport and storage containers for liquids comprising an outer jacket made of latticework or of sheet metal material and a pallet-type understructure, the plastic container being realized as a blow-molded body by blow molding from a tubular preform in a blow mold and having a container socket for connecting a container fitting in a fitting connecting area of a container wall, the container socket being provided with a container opening and being connected to a connecting flange of the container fitting via a welded joint, wherein the container wall has an inner layer made of a first plastic material and an outer layer made of a second plastic material, and the container socket has a longitudinal cross section widening toward the container opening in such a manner that an end face of the container socket is formed at least in part by an inner layer segment disposed opposite the outer layer, and a welding contact surface of the container socket is formed by the inner layer segment.

The present disclosure concerns process for manufacturing a closed head composite drum assembly, comprising: providing an inner shell defining a material-receiving cavity forming a material-filling opening in the inner shell; rotomolding at least partially a closed head outer drum defining an inner shell-containing cavity, the closed head outer drum at least partially enclosing the inner shell; and forming a bung opening in the closed head outer drum substantially in register with the material-filling opening. It also concerns a double wall closed head drum assembly.

A method for manufacturing a composite barrel structure includes fabricating a first plurality of composite panels that are assemblable into a first partial composite barrel section. The fabricating includes assembling a first layup of composite material and, concurrently, assembling at least one additional layup. The fabricating further includes heating the first layup with the at least one additional layup. A system for fabricating a plurality of panels that are assemblable into partial barrel sections includes a first workstation for fabricating a first plurality of composite panels that are assemblable into a first partial composite barrel section. The first workstation includes a first assembly station configured to concurrently assemble a first layup of composite material and at least one additional layup and a first heating station configured to heat the first layup concurrently with the at least one additional layup to yield the first plurality of composite panels.

The present disclosure relates to a method for manufacturing a nestable water tank, the method comprising molding a water tank comprising a hollow cylindrical body and cutting the water tank to form the nestable water tank comprising a tank body and a lid, wherein the tank body comprises: a side wall comprising a cylindrical shape running along a vertical axis, an interior surface, and an exterior surface; and a bottom connected to a bottom portion of the cylindrical tank, together forming a nestable water tank interior space capable of storing water within the nestable water tank interior space and comprising an interior bottom surface and an exterior bottom surface, wherein at least one of the tank body and the lid are each nestable with other similarly shaped tank bodies and lids.

A resin bath device for wet winding provided herein includes a resin stirring bath and a resin impregnation bath, where a bottom of a side wall of the resin stirring bath is connected to the resin impregnation bath, two ingredient baths are provided at two ends of the resin stirring bath, and a stirring mechanism is arranged inside the resin stirring bath. A resin dipping roller is mounted at a middle of the resin impregnation bath where a pressure roller is mounted at tops of side walls; an electric heating coil is arranged inside a bottom wall of the resin impregnation bath, and an electric heating rod is arranged at an axis of the pressure roller; and wire guide rollers are mounted at two ends of the side wall of the resin impregnation bath.

A composition comprising a high molecular weight, chromium catalyzed ethylene copolymer (also referred to as a polyethylene resin), a nucleating agent and zinc oxide.

A hot water storage device having a vessel includes a first section formed from a moulded material and a second section formed from a moulded material. An open end of the first section is sealingly engaged with an opposing open end of the second section to form the vessel. The first and second sections each have a generally cylindrical body portion and a closed end, comprising a head portion. The vessel includes a water inlet aperture moulded into the first or second section and a water outlet aperture moulded into the first or second section and wherein the inlet and outlet apertures are located on the body portion proximal to a tangent line between the body portion and the head portion.

A manufacturing system includes a plurality of rails, a plurality of head manipulating mechanisms respectively coupled to the rails, and a plurality of automated fiber placement (AFP) heads respectively coupled to the head manipulating mechanisms. The rails are arranged around a barrel-shaped layup tool, and each rail is parallel to a tool axis. Each head manipulating mechanism moves along a rail. The head manipulating mechanisms position the AFP heads in circumferential relation to each other about a tool surface of the layup tool. A total quantity of AFP heads comprises the maximum number of AFP heads that can be circumferentially arranged in longitudinal alignment with each other on the layup tool without interfering with each other while applying layup material over the tool when the layup tool is stationary and during rotation about the tool axis, to thereby fabricate a green state layup having a barrel shape.

The present invention relates to a rotomolded article, comprising at least one layer, wherein said at least one layer comprising comprises at least one metallocene-catalyzed polyethylene resin comprising at least two metallocene-catalyzed polyethylene fractions A and B; and at least one ionomer;

wherein the polyethylene resin comprises: at least 25% to at most 55% by weight of polyethylene fraction A based on the total weight of the polyethylene resin, wherein fraction A has a density at least 0.005 g/cm.sup.3 higher than the density of the polyethylene resin; and wherein the polyethylene resin has a density of at least 0.930 g/cm.sup.3 to at most 0.954 g/cm.sup.3 as measured according to ASTM D-1505 at 23° C.; a melt index MI2 of at least 1.0 g/10 min to at most 25.0 g/10 min as determined according to ISO 1133, condition D, at 190° C. and under a load of 2.16 kg.

The present invention also relates to a process for preparing said rotomolded article.