A polyethylene composition comprising may include a multimodal high-density polyethylene, comprising at least a lower molecular weight fraction and a higher molecular weight fraction, and a low density polyethylene, wherein the low-density polyethylene is present in an amount of greater than 1 to 20% by percent weight of the total composition. Methods for increasing die swell in blow molding processes may include polymerizing ethylene and optionally one or more alpha-olefin comonomers to obtain a multimodal HDPE comprising at least a lower molecular weight fraction and a higher molecular weight fraction, and blending a low-density polyethylene with the multimodal HDPE.

A method for continuously producing a composite material is disclosed. In some implementations, the method includes supplying a thermoplastic resin having an initial density, mixing polypropylene-graft-maleic anhydride (PPgMA) formed of a plurality of interconnected PPgMA molecules throughout the thermoplastic resin, distributing a plurality of carbon particles throughout the thermoplastic resin and the plurality of interconnected PPgMA molecules, and forming, by rotational molding, the composite material based on a combination of the thermoplastic resin, the PPgMA, and at least some of the plurality of carbon particles.

Disclosed herein, amongst other things, is a molded article, such as a preform that is blow moldable to form a container, and a related method of forming and recycling a container. The structure and steps includes injection molding a molded article having tubular body.

Unitary measuring pipettes include a tubular body of biaxially oriented thermoplastic material, together with size reduction, elimination, and/or reorientation of longitudinally spaced, raised circumferential witness features, to mitigate or avoid interference between such witness features and graduated volumetric markings on an outside surface of the tubular body. Methods and apparatus for vacuum forming of unitary measuring pipettes are also provided. Gas permeable apertures or pores having a maximum width of no greater than 150 microns, in ranges of 10-100 microns, 10-50 microns, or subranges thereof, may be defined in face plates or inserts received by mold blanks, or defined in molding surface of cooperating mold bodies, and may be used to produce a tubular pipette body having reduced height witness features. Cooperating mold bodies may each be produced from multiple mold body sections with gas passages defined therein and/or therebetween.

Method for heating a preform (1) comprising: introducing the preform (1) into a heating apparatus (5) comprising an array of infrared emitters (50) arranged in multiple columns (Cj) and multiple rows (Ri), orienting angularly the preform at an input angular position by rotating the preform around the longitudinal axis; setting power levels of the infrared emitters (50) so as to divide the array of infrared emitters (50) into subsets of columns (SCn), each subset of columns (SCn) generating heat at a different power level from an adjacent subset of columns (SCn); and heating the preform (1) with the array of infrared emitters (50) while translating the preform (1) in a direction parallel to the rows (Ri) of the array at a translation speed, and simultaneously rotating said preform (1) around its longitudinal axis (A1) in front of said infrared emitters (50) at a rotation speed.

A polyethylene terephthalate composition (PET), an injection-molded bottle preform made from a PET composition, a refillable PET container blow-molded from the preform, catalyst compositions used for making the PET composition, methods for making the PET composition, methods for injection-molding a PET bottle preform, methods for blow-molding a refillable PET bottle from a preform and methods for improving the rewash stability and recyclability of refillable PET bottles particularly for carbonated soft drinks.

A blown film of soil biodegradable aliphatic polyesters produced primarily from diacid and diol monomers. The diacid monomers may be of any type including succinic acid, adipic acid, and hexanedioic acid. The diol monomer may be of any type including ethylene glycol, propanediol, butanediol, and hexanediol. Commercial aliphatic polyesters produced from diacid and diol monomers include polybutylene succinate (PBS), polybutylene adipate succinate (PBAS), and polybutylene adipate (PBA). Comonomers may also be added. Such comonomers include chemicals with a single carboxylic acid, hydroxy, or amine moiety, which act as chain terminators, chemicals with three or more carboxylic acid, epoxy, and/or hydroxy moieties which, act as branching agents.

A graphene reinforced polyethylene terephthalate composition is provided for forming graphene-PET containers. The graphene reinforced polyethylene terephthalate composition includes a continuous matrix comprising polyethylene terephthalate and a dispersed reinforcement phase comprising graphene nanoplatelets. The graphene nanoplatelets range in diameter between 5 μm and 10 μm with surface areas ranging from about 15 m.sup.2/g to about 150 m.sup.2/g. In some embodiments, the graphene reinforced polyethylene terephthalate comprises a concentration of graphene nanoplatelets being substantially 3% weight fraction of the graphene reinforced polyethylene terephthalate. The graphene reinforced polyethylene terephthalate is configured to be injection molded into a graphene-PET preform suitable for forming a container. The graphene-PET preform is configured to be reheated above its glass transition temperature and blown into a mold so as to shape the graphene-PET preform into the container.

Provided is a single-layer container containing a polyester resin (X), a polyamide resin (Y), a blue colorant (A), and a red colorant (B). The content of the polyamide resin (Y) is from 0.05 to 7.0 mass%, and the content of the blue colorant (A) is from 1 to 40 ppm.

A method for continuously producing a composite material is disclosed. In some implementations, the method includes supplying a thermoplastic resin having an initial density, mixing polypropylene-graft-maleic anhydride (PPgMA) formed of a plurality of interconnected PPgMA molecules throughout the thermoplastic resin, distributing a plurality of carbon particles throughout the thermoplastic resin and the plurality of interconnected PPgMA molecules, and forming, by rotational molding, the composite material based on a combination of the thermoplastic resin, the PPgMA, and at least some of the plurality of carbon particles.