Composite sheet material for magnetic and electronic shielding and product obtained therefrom

A magnetic-card holder having two covering sheet members of rectangular shape superposed on each other and connected flexibly to each other at their edges along one corresponding side of the rectangle, at least one of the two covering sheet members having on its inner side a storage pocket for accommodating a magnetic card, wherein the improvement comprises:

• each of said two covering sheet members including a pair of walls defining a double-walled structure, and a composite sheet material comprising:
• a composite sheet metal including an electrodeposited iron foil with a thickness of at least 10 um and not more than 50 um, and a pair of metal plating layers on opposite surfaces of said electrodeposited iron foil, said metal plating layers being formed of a metal selected from the group consisting of zinc, tin, nickel, chromium, copper and lead,
• said composite sheet material being sandwiched between said pair of walls so as to cover a substantive part of the area of said covering sheet member.

A magnetic-card protection case for accommodating at least one magnetic card, including a front and a back flat wall member of rectangular shape superposed on each other and connected to each other at their edges along three sides of the rectangle, said front and back flat wall members being left unconnected at their edges along the remaining one side to provide an opening through which said magnetic card is inserted between the front and back flat wall members, wherein the improvement comprises:

• each of said front and back flat wall members including a pair of walls defining a double-walled structure, and a composite sheet material comprising a composite sheet metal including an electrodeposited iron foil with a thickness of at least 10 um and not more than 50 um, and a pair of metal plating layers on opposite surfaces of said electrodeposited iron foil, said metal plating layers being formed of a metal selected from the group consisting of zinc, tin, nickel, chromium, copper and lead, said composite sheet material being sandwiched between said pair of walls so as to cover a substantive part of the area of the respective flat wall member.

A shielding envelope of generally rectangular shape formed of a composite sheet material for accommodating at least one magnetic recording medium and/or at least one electronic component for storage and transportation thereof, said composite sheet material comprising a composite sheet metal including an electrodeposited iron foil with a thickness of at least 10 um and not more than 50 um, and a pair of metal plating layers on opposite surfaces of said electrodeposited iron foil, said metal plating layers being formed of a metal selected from the group consisting of zinc, tin, nickel, chromium, copper and lead.

A shielding housing of generally box structure for accommodating at least one magnetic recording medium and/or at least one electronic component for storage and transportation purpose, said housing comprising a storage box body having an opening, and a covering lid for closing said opening of the box body, said storage box body and said covering lid being made of a composite sheet material comprising a composite sheet metal including an electrodeposited iron foil with a thickness of at least 10 um and not more than 50 um, and a pair of metal plating layers on opposite surfaces of said electrodeposited iron foil, said metal plating layers being formed of a metal selected from the group consisting of zinc, tin, nickel, chromium, copper and lead.

A storage file formed of a composite sheet material for storing a magnetic recording medium, comprising a composite sheet metal including an electrodeposited iron foil with a thickness of at least 10 um and not more than 50 um, and a pair of metal plating layers on opposite surfaces of said electrodeposited iron foil, said metal plating layers being formed of a metal selected from the group consisting of zinc, tin, nickel, chromium, copper and lead.

A shielding material for magnetic and electronic shielding of electric wire(s), formed of a composite sheet material comprising a composite sheet metal including an electrodeposited iron foil with a thickness of at least 10 um and not more than 50 um, and a pair of metal plating layers on opposite surfaces of said electrodeposited iron foil, said metal plating layers being formed of a metal selected from the group consisting of zinc, tin, nickel, chromium, copper and lead.

A shielding material for magnetic and electronic shielding of electric wire, comprising a shielding sheet formed of a composite sheet material, comprising a composite sheet metal including an electrodeposited iron foil with a thickness of at least 10 um and not more than 50 um, and a pair of metal plating layers on opposite surfaces of said electrodeposited iron foil, said metal plating layers being formed of a metal selected from the group consisting of zinc, tin, nickel, chromium, copper and lead, said shielding sheet having at least at one end thereof a pressure sensitive adhesive layer of a predetermined width, said shielding sheet wrapping an electric wire such that said adhesive layer extends along the electric wire and is positioned over a portion of the shielding sheet for fixing said one end of the shielding sheet to said portion.

A wall-decorative material for magnetic and electronic shielding, consisting of a composite sheet material comprising a composite sheet metal including an electrodeposited iron foil with a thickness of at least 10 um and not more than 50 um, and a pair of metal plating layers on opposite surfaces of said electrodeposited iron foil, said metal plating layers being formed of a metal selected from the group consisting of zinc, tin, nickel, chromium, copper and lead.