US 6,180,203 B2 · Rotational moulding process

Abstract

A method for rotational molding of articles, including the step of rotationally molding a mixture of particulate plastics material comprising at least one thermoplastics material having a first particle size and a second thermoplastics material having a larger particle size wherein, in use, said first thermoplastic material fuses to form an outer skin and subsequently said second thermoplastics material fuses to form an inner skin bonded to the outer skin of a resultant molded article. The method may also include the step of incorporating a quantity of rollable molded reinforcing elements in the mold with said first and second thermoplastics materials, wherein the reinforcing elements are located in a spaced array thereby forming bridges between opposed inner skin surfaces as they expand. Articles, such as a shipping pallet, rotationally molded using the method are also disclosed.

Claims17

Dependent claims

A method for rotational moulding of articles, comprising the steps of:

(a) rotationally moulding a mixture of particulate plastic material including at least one thermoplastic material having a first particle size and a second thermoplastic material comprised of a reclaimed plastic material and having a larger particle size;
said second thermoplastic material having a melt temperature higher than the melt temperature of the first thermoplastic material, said first thermoplastic material being homopolymeric, and said second thermoplastic material being a mixture of polymeric species;
(b) wherein, in use, said first thermoplastic material fuses to form an outer skin and subsequently said second thermoplastic material fuses to form an inner skin bonded to the outer skin of a resultant moulded article.

Dependencies are inferred from the claim text.

Rotational moulding process

Life of this patent

Rotational moulding process

Life of this patent

Abstract

Claims17