This disclosure relates generally to corrugated pipe, and more particularly to corrugated pipe with an outer wrap. In one embodiment, a pipe includes an axially extended bore defined by a corrugated outer wall having axially adjacent, outwardly-extending corrugation crests, separated by corrugation valleys. The pipe also includes an outer wrap applied to the outer wall. The outer wrap may include fibers and plastic. The outer wrap may span the corrugation crests producing a smooth outer surface.

A hybrid polymer-matrix composite is described, containing between 10.0% and 45.0% by weight of cellulosic fiber up to 3.0 mm long and with a maximum moisture content of 5.0%; between 5.0% and 40.0% by weight of synthetic fiber up to 4.0 mm long and compatibilizing additives, said constituents being homogenized directly in the twin-screw extruder, with each reinforcing fiber entering via a specific feeder, to be adjusted to the temperature and shearing applied to the reinforcing fibers, guaranteeing the correct dispersion of the fiber for encapsulation by the polymer matrix, optimizing interface interactions and perfect homogenization.

Disclosed is a device for processing plastic materials, having a shredding unit, a conveying unit having a screw (7), and an extruder, having at least one extruder screw (11), adjoining the screw, wherein the central longitudinal axis (3) of the screw (7) is oriented at an angle to the central longitudinal axis (10) of the extruder screw (11), in particular at an angle of 80° to 100°, preferably 90°, and the longitudinal axis (3) of the screw (7) is offset with respect to the longitudinal axis (10) of the extruder screw (11) by an offset (v) in the direction of the direction of rotation (12) of the extruder screw (11) at or in the region of the discharge opening (8) or the intake opening (16) of the conveying unit.

[Problem] To provide: a biaxially oriented polyester film that exhibits excellent transparency, enables easy secondary processing such as coating and vapor deposition, provides excellent post-secondary-processing properties, and is environmentally friendly in that the film is made from polyester resins recycled from the market and society, including those from PET bottles; and a production method for such a film. [Solution] A biaxially oriented polyester film comprising a polyester resin composition containing particles and polyester resins recycled from the market and society, including those from PET bottles, the film having at least one surface that satisfies all requirements (1)-(3). (1) The number of fine projections having a height less than 3 nm per an area of 4×10-12m2 is 250-600. (2) The number of fine projections having a height not less than 3 nm per an area of 4×10-12m2 is 300-600. (3) The arithmetic average height Sa is 0.01-0.025 μm.

An optical resin formed body manufacturing method includes: (i) depressurizing an inside of a container holding a molten optical resin; (ii) pressurizing the inside of the container holding the molten optical resin; and (iii) shaping the optical resin taken out of the container into a given shape. The steps (i) and (ii) are sequentially performed once each or are alternately performed two or more times each. In the step (i), a duration t1 [min] of the depressurization of the inside of the container is set such that the duration t1 and a viscosity .Math.1 [Pa•s] of the molten optical resin satisfy a relation .Math.1/t1 < 200. In the step (ii), a duration t2 [min] of the pressurization of the inside of the container is set such that the duration t2 and a viscosity .Math.2 [Pa•s] of the molten optical resin satisfy a relation .Math.2/t2 < 200.

A process is disclosed for combining a polysaccharide ester polymer with one or more plasticizers in a way that produces a homogeneous blend. The polysaccharide ester polymer can be in the form of particles and fed to a heated extruding device. Separate quantities of plasticizer can then be combined with the polysaccharide ester polymer particles as they are conveyed through the extruding device. Through the process of the present disclosure, a homogenous blended product can be formed that can then be used to form various articles including fibers, films, and molded articles.

A system for producing a homogenous extrudate powder coating composition having predetermined properties, the system comprising a color library database that is configured to store one or more input formulation data objects capable of use in controlling the inputs and operation of an electronically controlled homogenous extrudate mixer.

A manufacturing method of a halogen-free flame-retardant thermoplastic braided fiber reinforced polymer composite board, comprising steps of: preparing a recycled material containing a halogen-free flame-retardant thermoplastic braided fiber reinforced polymer composite; adding a polymer base material to the recycled material to form a core layer material and extruding the core layer material with a low shear extruder; hot pressing the core layer material by rollers to obtain a recycled fiber core layer; preparing a reinforcement layer containing a fiber material or a fabric with pores; and stacking and hot pressing the recycled fiber core layer and the reinforcement layer.

A thermoplastic resin pellet is columnar. A cross-sectional shape taken along a plane orthogonal to a height direction of the thermoplastic resin pellet has a longer diameter represented by “a” and a shorter diameter represented by “b”. A ratio a/b is greater than or equal to 1.0, and the ratio a/b is less than or equal to 2.6. A ratio α of a unit height volume of a cylindrical portion of a hopper of a molding machine, into which the thermoplastic resin pellet is loaded, to a volume of the thermoplastic resin pellet is greater than 16. A method for manufacturing an electric cable includes supplying the thermoplastic resin pellet to the hopper, melting the thermoplastic resin pellet in the cylinder to supply molten resin to the die, and extruding the molten resin from the die to form a sheath on a core wire.

The present invention relates to a processing technology for manufacturing seepage irrigation pipe with alternating effluent sections and non-effluent sections, and in particular, to the field of underground seepage irrigation in agriculture and forestry. The processing technology combines the production unit for water-effluent pipes with the production unit for non-effluent pipes, and produces the seepage irrigation pipeline by adjusting the raw material ratios, controlling the spindle speed, spindle acceleration time, and spindle deceleration time of the two pipeline production units, to generate a seepage irrigation pipe with alternating effluent sections and non-effluent sections. The lengths of the effluent sections and non-effluent sections can be adjusted, the pipe wall thickness can also be adjusted by adjusting the inner and outer diameter of the internal mold of the pipe forming unit, a seepage irrigation pipe with alternating effluent sections and non-effluent sections is environment-friendly, efficient, water-saving, and useful for underground irrigation.