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 is provided having a sidewall, a downwardly extending upper lip, and a perforated line defined at a top edge of the container where the lip and sidewall are joined. The sidewall and lip may be formed from a container body constructed of a single sheet of material that is wrapped such that marginal edge portions of the blank are brought together in overlapping fashion to form a side seam. When the sidewall and lip are formed from such a blank of material, the perforated line is formed a specified distance below a top edge of such blank. The perforated line reduces the amount of force, heat and lubricant required in order to form (e.g., curl, roll, fold or bend) the upper lip of the container. The slits of the perforated line may extend across a width of the blank in either a uniform or variable fashion.

A device for attaching a mouthpiece to an innerliner of an aircraft water tank is provided. A cylinder portion of an innerliner is thermally deformed to conform to an inner circumferential portion of a cylinder-like portion, and an inner circumferential portion of a dome portion of the innerliner is attached to a skirt portion by an adhesive. A lower mold includes two sections inserted inside the innerliner from the inner side of a mouthpiece in a folded state. The two sections are opened inside the innerliner and a holding member holds the two sections in an open state. The lower mold can be disposed in the innerliner sealed from the inner side of the mouthpiece, and abutment of an outer abutting surface of an upper mold against a first annular surface and abutment of an inner abutting surface of the lower mold against a second annular surface can be performed.

A film winding assembly for use in FRP tank production includes a pedestal, two supporting bases are slidingly provided on the pedestal, translation assemblies engaging with the two supporting bases are provided on the pedestal, the two support bases are configured to be hollow, sliding plates are slidably connected in the two supporting bases, a plurality of cushioning springs are connected in between the sliding plates and the two supporting bases, fixing seats are connected on the sliding plates. With the winding assembly according to the present invention, vibration generated during winding can be efficiently cushioned, users can lock the tank body quickly, tediousness and manpower consumption due to manual locking can be avoided, furthermore, with the present assembly, during winding of the tank body, particles stained on the plastic film can be cleanly timely.

It is possible to achieve reduction in the occurrence of tension decrease at fiber bundles in a sheet. A method of manufacturing a tank includes several steps. A feed step is carried out of feeding a sheet including aligned fiber bundles while applying tension to the sheet in the longitudinal directions of the fiber bundles. The method further includes a detection step of detecting a decreased tension part subjected to tension decrease in the sheet being fed and a tension recovery step of compensating for the tension decrease at the decreased tension part by spraying an organic solvent if the decreased tension part is detected in the detection step. The method also includes a winding step of winding the sheet having been fed on a liner.

The present invention relates to a rotomolded article, comprising at least one metallocene-catalyzed polyethylene resin comprising at least two metallocene-catalyzed polyethylene fractions A and B, 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 melt index MI2 of at least 25.0 g/10 min as determined according to ISO 1133, condition D, at 190 C. and under a load of 2.16 kg, and 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 0.938 g/cm.sup.3 to at most 0.950 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.

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.

A container for storing liquids includes an inner layer including a storage space for storing liquids; an outer layer; and multiple spacers fastened between the inner layer and the outer layer to form multiple compartments. The spacer includes a first surface and a second surface. The first surface is secured to an adhesive layer of the inner layer. The first surface has many cavities. The second surface is secured to the outer layer and having projections complimentarily secured to the cavities. A manufacturing method of the container is also provided. Therefore, it can solve the problem permeation and adhesive failure caused by leaking. It can generate an early alarm by detecting any leaking or permeation of the container.

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.

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.