Methods have been discovered that make it possible to continuously extrude tubes of P4HB and copolymers thereof. These methods allow tubes of P4HB and copolymers thereof to be produced without radial deformation of the tubes despite the slow crystallization of the polymer and copolymers. The methods can produce tubes of P4HB and copolymers thereof with tightly defined outside and inside diameters which are required for medical application. These tubes are produced by radial expansion at temperatures above the melting temperature of P4HB and copolymers thereof, and using low tube cooling temperatures and prolonged cooling times. The tubes made from P4HB and copolymers thereof are flexible, and can be prepared with high elongation to break values.

Methods of making oxidation and wear resistant polymeric materials using peroxide cross-linking and high temperature melting process are disclosed. A multiple step procedure for enabling the manufacturing of such material without size limitations is also disclosed.

The present disclosure discloses an injection molding method for fabricating a transparent device, and belongs to the technical field of material processing. The method comprises: preparing a nano-microsphere structural polymer material from a long-chain polymer material; obtaining a glass transition temperature and a viscous flow transition temperature of the nano-microsphere structural polymer material; obtaining a processing temperature of the nano-microsphere structural polymer material according to the glass transition temperature and the viscous flow transition temperature; drying the nano-microsphere structural polymer material; plasticizing the dried nano-microsphere structural polymer material according to the processing temperature; filling the plasticized nano-microsphere structural polymer material; cooling the filled nano-microsphere structural polymer material; and demolding the cooled nano-microsphere structural polymer material to form a transparent device. With the present disclosure, the technical effect that the fabricated device has high precision and no oriented optical distortion and strain birefringence is achieved.

A device for dropletizing a flowable product, having an outer drum, which is arranged in a rotatable manner on a core and is provided with a plurality of through-openings in its circumference. A feed duct extends in the longitudinal direction of the core and a distribution device bearing against the inner circumference of the outer drum are provided in the core. At least one supply duct is provided between the feed duct and the distribution device along the length of the feed duct, and a shut-off member for setting a free cross section of the at least one supply duct is provided.

A method for manufacturing a plastic composition, comprising: mixing thermoplastic polymer material particles and thermoset composition particles comprising cured thermoset polymer, the mixing comprising rising the temperature of the composition and at least partly melting the surface of thermoplastic polymer material particles, and simultaneously mixing the particles allowing thermoset composition particles adhere to the thermoplastic polymer material particles, and cooling the composition.

A composition for use as a binder system for road marking formulations and methods for making thereof is disclosed. The binder system is provided as pellets. The method provides for making the pelletized binder system, and mixing the pelletized binder system with fillers and other components, heating the mixed ingredients forming into a molten mixture for applying on a road surface. The pelletized binder system comprises at least a resin and an elastomer in one embodiment; at least a resin and a plasticizer in a second embodiment; and at least a resin, an elastomer, and a plasticizer in a third embodiment.

In the context of a system that uses a pellet-type extruder head to form solid objects by moving the extruder relative to a build surface while melting and extruding pellets of raw material, systems and methods are provided which comprise cooling at least a portion of a pathway by which the pellets of raw material are conveyed to a rotating extruder lead screw of the extruder head.

In a tower integrated by the heating and drying section and the cooling section, both sides of the heating and drying section housing are provided with an air inlet box and an air outlet box; the air inlet box is communicating with a heat exchanger and distribution pipes in the heating and drying section housing, the air outlet box is communicating with distribution pipes in the heating and drying section housing and a dust remover; both sides of the cooling section housing are provided with an air inlet box and an air outlet box; the air inlet box is communicating with a heat exchanger and distribution pipes in the cooling section housing; the air outlet box is communicating with distribution pipes in the cooling section housing and a dust remover. The integral device improves the heat exchange effect and preventing the polypropylene particles from aging.

Methods of making oxidation and wear resistant polymeric materials using peroxide cross-linking and high temperature melting process are disclosed. A multiple step procedure for enabling the manufacturing of such material without size limitations is also disclosed.

Methods of making oxidation and wear resistant polymeric materials using peroxide cross-linking and high temperature melting process are disclosed. A multiple step procedure for enabling the manufacturing of such material without size limitations is also disclosed.