Rotational molding processes for producing hollow articles include the steps of: a) filling a mold with a polymer composition comprising: i) an organic polymer; and ii) a rotational molding densification accelerator (RMDA) selected from the group consisting of alkoxylated fatty alcohols, alkoxylated fatty esters, alkoxylated fatty amines, alkoxylated fatty amides, and combinations thereof; b) rotating the mold around at least one axis while heating the mold in an oven, thereby fusing the composition and spreading it to the walls of the mold; c) cooling the mold; and d) opening the mold; and e) removing the hollow article from the mold. The rotational molding processes using such polymer composition results in faster densification, which allows for reduction in overall cycle times for making the hollow articles.

A system for the production of an object from a material containing a hardenable base material by rotational moulding includes a die having die walls surrounding a cavity wherein an object is to be formed, the die being provided with a flow channel for conducting a heat exchange fluid and heating or cooling the die, a rotation device for rotating the die, for bringing melted base material into contact with the die walls surrounding the die cavity and forming the object by rotational moulding, and thermal assemblies comprising a heating assembly and a cooling assembly for promoting flow of heat exchange fluids through the flow channel.

Methods for constructing a building module which is a sandwich panel comprising a first region which provides part of the roof structure of a building, a second region which provides part of the wall structure of building, and a third region which provides part of the floor structure of the building.

A weight device with handle comprises a body (3) of approximately spheroidal and hollow shape containing a ballast (5) and comprises a handle (7) having an approximately C shape and with ends (9) incorporated in the wall (11) of the body (3) or in respective protrusions (13) of said wall (11). The wall (11) of the body (3) comprises an outer layer (15) and an inner layer (17) which are mutually adherent and extending in almost every portion of the body (3). The outer layer (15) is made of soft and/or shockproof material of the closed-cell or open-cell foam type or of the elastomeric type with impact energy absorption. The inner layer (17) is made of rigid or semi-rigid material and of a type that ensures the stability of the shape of the body (3) over time, of cross-linked thermoplastic resin or other stable material with a high elastic modulus.