A thrust reverser cascade of an aircraft engine comprises a frame and a vane overmolded onto the frame. The frame and the vane each comprise reinforcement fibers in a thermoplastic matrix. A method is disclosed for manufacturing the thrust reverser cascade or another part comprising an aerodynamic surface configured to interact with a flow of fluid. The method comprises providing a first portion of the part and overmolding a second portion of the part onto the first portion where the second portion includes the aerodynamic surface.

In this molded surface fastener, an engaging element includes a columnar stem portion, and micro pawl portions protruding outward from an upper end outer peripheral edge of the stem portion in a plan view of the engaging elements. A pawl width dimension of the micro pawl portions is smaller than a line segment connecting two points on the upper end outer peripheral edge of the stem portion. The micro pawl portions protrude toward a base portion. This molded surface fastener has a high peel strength and a shear strength with respect to a female surface fastener.

In this molded surface fastener, an engaging element includes a columnar stem portion, and micro pawl portions protruding outward from an upper end outer peripheral edge of the stem portion in a plan view of the engaging elements. A pawl width dimension of the micro pawl portions is smaller than a line segment connecting two points on the upper end outer peripheral edge of the stem portion. The micro pawl portions protrude toward a base portion. This molded surface fastener has a high peel strength and a shear strength with respect to a female surface fastener.

A helmet manufacturing method involves: producing a shell and a protector, the shell having two opposing cheek-protecting portions, the protector having a jaw-protecting portion and a neck-protecting portion connected to the jaw-protecting portion; putting the shell and the protector in a die such that bottom edges of the cheek-protecting portions of the shell connect to a top edge of the neck-protecting portion of the protector; introducing a foam material into the die, apply heat and pressure to the foam material such that the foam material expands and binds to an inner side of the shell and an inner side of the protector; and taking a helmet finished product out of the die. Therefore, both the jaw-protecting portion of the integrally-formed protector and the helmet finished product are reinforced.

A helmet manufacturing method involves: producing a shell and a protector, the shell having two opposing cheek-protecting portions, the protector having a jaw-protecting portion and a neck-protecting portion connected to the jaw-protecting portion; putting the shell and the protector in a die such that bottom edges of the cheek-protecting portions of the shell connect to a top edge of the neck-protecting portion of the protector; introducing a foam material into the die, apply heat and pressure to the foam material such that the foam material expands and binds to an inner side of the shell and an inner side of the protector; and taking a helmet finished product out of the die. Therefore, both the jaw-protecting portion of the integrally-formed protector and the helmet finished product are reinforced.

A method of 3D printing a part using a photopolymer build material including the steps of characterizing a three-dimensional curved surface using a mathematical equation and a specification; characterizing at least one surface transition between at least two parallel slice planes that intersect the characterized three-dimensional curved surface using a surface transition equation; generating at least one set of 3D printing instructions to selectively solidify the photopolymer build material; and 3D printing the part using the at least one set of 3D printing instructions.

A method of 3D printing a part using a photopolymer build material including the steps of characterizing a three-dimensional curved surface using a mathematical equation and a specification; characterizing at least one surface transition between at least two parallel slice planes that intersect the characterized three-dimensional curved surface using a surface transition equation; generating at least one set of 3D printing instructions to selectively solidify the photopolymer build material; and 3D printing the part using the at least one set of 3D printing instructions.

A resin molding method is capable of reducing the use amount of micropellets and obtaining a resin molded article having required characteristics. A resin molding method includes a disposing step of disposing a preliminary molded body laminated and formed in a three-dimensional shape in a molding die, a filling step of heating and melting the preliminary molded body by an electromagnetic wave transmitted through the molding die and filling the molding die with a molten resin material, and a cooling step of cooling and solidifying the molten resin material in the molding die. In the cooling step, a resin molded article integrated so as to eliminate a lamination interface of the preliminary molded body is formed in the molding die.

A resin molding method is capable of reducing the use amount of micropellets and obtaining a resin molded article having required characteristics. A resin molding method includes a disposing step of disposing a preliminary molded body laminated and formed in a three-dimensional shape in a molding die, a filling step of heating and melting the preliminary molded body by an electromagnetic wave transmitted through the molding die and filling the molding die with a molten resin material, and a cooling step of cooling and solidifying the molten resin material in the molding die. In the cooling step, a resin molded article integrated so as to eliminate a lamination interface of the preliminary molded body is formed in the molding die.

A wire grid structure and a manufacturing method therefor, and a projection screen are provided. The manufacturing method includes: extruding a molten mixed material body in a melt extruder to a casting roll to form a casting piece; patterning the casting piece by means of an impression roll to form a precursor having a preset wire grid structure pattern, where the precursor is wound on the impression roll and has a first dimension in a height direction; stretching the precursor by a first group of stretching rolls and a second group of stretching rolls in two opposite directions along a direction perpendicular to the height direction to form the wire grid structure, a preset distance being configured between the first group of stretching rolls and the second group of stretching rolls. The wire grid structure has a second dimension in the height direction that is greater than the second dimension.