The present invention provides an optical film containing an additive. The optical film includes a high concentration portion containing the additive, and a low concentration portion containing the additive at a concentration lower than the high concentration portion. The low concentration portion is provided on both sides of the high concentration portion in a thickness direction of the optical film, and the low concentration portion is provided on both sides of the high concentration portion in a width direction of the optical film.

A percussion instrument includes: a cylindrical shell portion having an open upper surface side; and a drumhead stretched to be installed on the upper surface side of the shell portion, wherein the drumhead includes: a membrane formed of a membranous material, having a struck head portion configured as a striking face to be struck by a performer and an outer periphery located on an outer circumferential side of the struck head portion; and an annular frame formed of a resin material and having the outer periphery of the membrane fixed thereto, and the drumhead is integrally formed by the membrane and the frame by injection molding.

A method for recycling EVA plastic foamed material may include steps of collecting excess plastic foamed compound; granulating through hot melt method; weighing and mixing granular plastic compound; rolling mixed compound into plastic film; and foaming plastic film to produce EVA foam mat. The excess plastic foamed compound can be recycled and reused in the present recycling method, which has environmental benefits and reduces the manufacturing cost. Also, the EVA foam mat, which is formed from the high-quality of the plastic film coupled between two unfoamed plastic mat bodies, has strong structural strength and prolonged lifetime, which prevents the EVA foam mat from deformation due to heavy pressure and protects the floor or tiles thereunder.

Provided are a production method of a mold, a manufacturing method of a pattern sheet, a production method of an electroform, a production method of a mold using an electroform, and an original. The production method includes: preparing an original having an inclined portion which is formed in an enclosed shape on an outer peripheral portion of a protruding pattern formed at a center portion on a base and gradually increases in thickness from inside toward outside, and a thermoplastic resin sheet; and forming a recessed pattern on the thermoplastic resin sheet by pressing the original which is heated against the thermoplastic resin sheet at a position where a flat surface of the original and a surface of the thermoplastic resin sheet are separated from each other, cooling the original in the state where the original is pressed, and separating the original from the thermoplastic resin sheet.

The present invention provides an insulation film, comprising a film upper layer and a film lower layer, wherein both of the film upper layer and film lower layer are made of a PC or PET material, the PC or PET material contains a flame retardant to meet the flame retardance and puncture resistance property thereof; a film intermediate layer located between the film upper layer and the film lower layer, the film intermediate layer is made of the blends of PP and/or PE and PC and/or PET; an upper surface of the film intermediate layer is bound together with a lower surface of the film upper layer, a lower surface of the film intermediate layer is bound together with an upper surface of the film lower layer.

A hydro-formed film includes a polymeric web having a first substantially planar surface and a second substantially planar surface opposite the first substantially planar surface, and a plurality of three-dimensional micro-apertures extending from the first substantially planar surface. The plurality of three-dimensional micro-apertures have a mesh count in a range of about 40 to about 75 apertures per linear inch. The hydro-formed film has a Compression Sensor Point (CSP) count of at least about 80.

The present invention provides an insulation film (100), comprising a film upper layer (101) and a film lower layer (103), wherein both of the film upper layer (101) and film lower layer (103) are made of a PC or PET material, the PC or PET material contains a flame retardant to meet the flame retardance and puncture resistance property thereof; a film intermediate layer (102) located between the film upper layer (101) and the film lower layer (103), the film intermediate layer (102) is made of the blends of PP and/or PE and PC and/or PET; an upper surface of the film intermediate layer (102) is bound together with a lower surface of the film upper layer (101), a lower surface of the film intermediate layer (102) is bound together with an upper surface of the film lower layer (103).

Ferrite films, antennas including ferrite films, and methods of making thereof are provided. The methods can include tape casting of a slurry to produce a green film, wherein the slurry includes a ferrite powder, a dispersant, and a binder in a suitable solvent; and densifying the green film to produce the ferrite film having a thickness of 50 m to 5 mm. The methods can be used to make large area films, for example the films can have a lateral area of about 1000 cm.sup.2 to 3000 cm.sup.2. VHF/UHF antennas are including the ferrite films are also provided.

A method of forming a blown film comprising extruding a molten composition through a die opening to form a film; wherein the molten composition comprises at least one polyethylene and within the range from 0.10 wt % to 10 wt % of a cyclic-diene terpolymer by weight of the composition; causing the film to progress in a direction away from the die opening; cooling the film at a distance from the die opening, the distance adjusted to effect the properties of the film; and isolating a blown film therefrom.

Example systems and methods are described including backing paper for use with uncured pre-impregnated material. An example system includes a backing paper having a first surface and a second surface. The system also includes a coating material positioned on the first surface of the backing paper. A blowing agent is encapsulated within the coating material.