Tray for conveying magnetic head for magnetic disk

A tray for carrying a magnetic head for magnetic disks,

• wherein the tray is prepared by injection-molding a conductive polycarbonate resin composition,
• the tray has a surface roughness such that the ten-point average roughness (Rz) thereof as determined through a measurement employing a cutoff wavelength of 2.5 mm is 5 μm or smaller,
• when the tray is immersed in 50 ml of pure water while stirring the water at 60° C. for 60 minutes, the amount of chlorine ions which dissolve away from the tray is 0.01 μg or smaller per unit surface area (cm2) of the tray, and
• the tray has a surface resistance of from 103 to 1012 Ω.

A tray for carrying a magnetic head for magnetic disks,

• wherein the tray is prepared by injection-molding a conductive polycarbonate resin composition,
• the tray has a surface resistance of from 1×103 to 1×1012 Ω,
• the tray has a surface roughness such that in a measurement employing a cutoff wavelength of 2.5 mm, the proportion of 10%-cutting-level load length (tp) is 1% or higher and the count of peaks not smaller than ±0.1 μm based on the center line (Pc) is 100 or smaller per cm of the length of measurement, and
• when the tray is immersed in 50 ml of pure water while stirring the water at 60° C. for 60 minutes, the amount of chlorine ions which dissolve away from the tray is 0.01 μg or smaller per unit surface area (cm2) of the tray.

A tray for carrying a magnetic head for magnetic disks,

• wherein the tray is prepared by molding a polycarbonate resin composition containing a conductive loading material in an amount of from 0.25 to 50% by weight,
• the amount of a chlorinated hydrocarbon generated from the tray having a surface area of 12.6 cm2 under the conditions of a heating temperature of 85° C. and an equilibrium time of 16 hours is 0.1 μg/g or smaller when determined by head space gas chromatography,
• when the tray is immersed in 50 ml of pure water while stirring the water at 60° C. for 60 minutes, the amount of chlorine ions which dissolve away from the tray is 0.01 μg or smaller per unit surface area (cm2) of the tray, and
• the tray has a surface resistance of from 103 to 1012 Ω.

A tray for carrying a magnetic head for magnetic disks, said tray satisfying at least one of the following (1) to (5):

• (1) the tray is prepared by molding a conductive thermoplastic resin composition and has a surface resistance of from 1×103 to 1×1012 Ω,
• when the tray is immersed in 500 ml of pure water while applying 40 kHz ultrasonic thereto for 60 seconds, the number of particles having a particle diameter of 1 μm or larger which detach from the surface of the tray is 5,000 pcs/cm2 or smaller;
• (2) the tray has a surface roughness such that in a measurement employing a cutoff wavelength of 2.5 mm, the proportion of 10%-cutting-level load length (tp) is 1% or higher and the count of peaks not smaller than ±0.1 μm based on the center line (Pc) is 100 or smaller per cm of the length of measurement;
• (3) the amount of a chlorinated hydrocarbon generated from the tray having a surface area of 12.6 cm2 under the conditions of a heating temperature of 85° C. and an equilibrium time of 16 hours is 0.1 μg/g or smaller when determined by head space gas chromatography,
• (4) when the tray is immersed in 50 ml of pure water while stirring the water at 60° C. for 60 minutes, the amount of chlorine ions which dissolve away from the tray is 0.01 μg or smaller per unit surface area (cm2) of the tray;
• and
• (5) the total amount of all gases generated from the tray having a surface area of 12.6 cm2, the amount of methylene chloride generated therefrom, and the amount of a hydrocarbon generated therefrom in a measurement conducted under the conditions of a heating temperature of 85° C. and an equilibrium time of 16 hours are 1 μg/g or smaller, 0.1 μg/g or smaller, and 0.5 μg/g or smaller, respectively, when determined by head space gas chromatography.

A tray for carrying a magnetic head for magnetic disks,

• wherein the tray is prepared by molding a conductive thermoplastic resin composition, and
• when the tray is immersed in 50 ml of pure water while stirring the water at 60° C. for 60 minutes, the amount of chlorine ions which dissolve away from the tray is 0.01 μg or smaller per unit surface area (cm2) of the tray, and
• the tray has a surface resistance of from 1×103 to 1×1012 Ω, and that when the tray is immersed in 500 ml of pure water while applying 40 kHz ultrasonic thereto for 60 seconds, the number of particles having a particle diameter of 1 μm or larger which detach from the surface of the tray is 5,000 pcs/cm2 or smaller, or
• the tray has a surface roughness such that the ten-point average roughness (Rz) thereof as determined through a measurement employing a cutoff wavelength of 2.5 mm is 5 μm or smaller, or
• the amount of a chlorinated hydrocarbon generated from the tray having a surface area of 12.6 cm2 under the conditions of a heating temperature of 85° C. and an equilibrium time of 16 hours is 0.1 μg/g or smaller when determined by head space gas chromatography.

A tray for carrying a magnetic head for magnetic disks,

• wherein the tray is prepared by molding a conductive thermoplastic resin composition and has a surface resistance of from 1×103 to 1×1012 Ω,
• when the tray is immersed in 500 ml of pure water while applying 40 kHz ultrasonic thereto for 60 seconds, the number of particles having a particle diameter of 1 μm or larger which detach from the surface of the tray is 3,500 pcs/cm2 or smaller,
• wherein when the tray is immersed in 50 ml of pure water while stirring the water at 60° C. for 60 minutes, the amount of chlorine ions which dissolve away from the tray is 0.01 μg or smaller per unit surface area (cm2) of the tray, and
• the amount of a chlorinated hydrocarbon generated from the tray having a surface area of 12.6 cm2 under the conditions of a heating temperature of 85° C. and an equilibrium time of 16 hours is 0.1 μg/g or smaller when determined by head space gas chromatography.

A tray for carrying a magnetic head for magnetic disks,

• wherein the tray is prepared by molding a conductive thermoplastic resin composition and has a surface resistance of from 1×103 to 1×1012 Ω,
• when the tray is immersed in 500 ml of pure water while applying 40 kHz ultrasonic thereto for 60 seconds, the number of particles having a particle diameter of 1 μm or larger which detach from the surface of the tray is 5,000 pcs/cm2 or smaller,
• the tray has a surface roughness such that the ten-point average roughness (Rz) thereof as determined through a measurement employing a cutoff wavelength of 2.5 mm is 5 μm or smaller,
• the amount of a chlorinated hydrocarbon generated from the tray having a surface area of 12.6 cm2 under the conditions of a heating temperature of 85° C. and an equilibrium time of 16 hours is 0.1 μg/g or smaller when determined with a head space gas chromatogram, and
• when the tray is immersed in 50 ml of pure water while stirring the water at 60° C. for 60 minutes, the amount of chlorine ions which dissolve away from the tray is 0.01 μg or smaller per unit surface area (cm2) of the tray.

A tray for carrying a magnetic head for magnetic disks,

• wherein the tray is prepared by molding a conductive thermoplastic resin composition and has a surface resistance of from 1×103 to 1×1012 Ω,
• wherein the tray has a surface roughness such that in a measurement employing a cutoff wavelength of 2.5 mm, the proportion of 10%-cutting-level load length (tp) is lower than 4%,
• when the tray is immersed in 50 ml of pure water while stirring the water at 60° C. for 60 minutes, the amount of chlorine ions which dissolve away from the tray is 0.01 μg or smaller per unit surface area (cm2) of the tray, and
• the amount of a chlorinated hydrocarbon generated from the tray having a surface area of 12.6 cm2 under the conditions of a heating temperature of 85° C. and an equilibrium time of 16 hours is 0.1 μg/g or smaller when determined with a head space gas chromatogram.