Synthetic resin card and method of producing the same
First Claim
1. A synthetic resin card comprising:
- a substantially planar core section; and
a first outer layer and a second outer layer laminated on front and back surfaces of the core section, respectively,wherein,the first outer layer and the second outer layer have molecular orientations,the first outer layer and the second outer layer are adhered directly to the front and back surfaces of the core section by means of a thermal pressing and are symmetrically bonded to the core section, andthe difference Δ
in the angle of orientation between the molecular orientations of the first and second outer layers is 20°
or less causing the synthetic resin card warpage to be 1.5 mm or less, and at least one of the first and second outer layers is provided with a recording layer.
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Accused Products
Abstract
A synthetic resin card in which card warpage can be reduced and a method for producing the same are provided. By setting the difference Δ in the angle of orientation between outer layers symmetrically laminated on a card core section, it is possible to reduce imbalance of stress resulting from the difference in the shrinkage factor between the outer layers, and card warpage can be suppressed. Furthermore, by setting the thickness of the outer layers at 25 μm to 125 μm, rising of the surface of the synthetic resin card can be reduced. By reducing the card warpage and the rising of the surface of the synthetic resin card, it is possible to improve moving characteristics when the synthetic resin card is allowed to move in a device.
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Citations
15 Claims
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1. A synthetic resin card comprising:
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a substantially planar core section; and a first outer layer and a second outer layer laminated on front and back surfaces of the core section, respectively, wherein, the first outer layer and the second outer layer have molecular orientations, the first outer layer and the second outer layer are adhered directly to the front and back surfaces of the core section by means of a thermal pressing and are symmetrically bonded to the core section, and the difference Δ
in the angle of orientation between the molecular orientations of the first and second outer layers is 20°
or less causing the synthetic resin card warpage to be 1.5 mm or less, and at least one of the first and second outer layers is provided with a recording layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for producing a synthetic resin card comprising the steps of:
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laminating a first outer layer with a first molecular orientation and a second outer layer with a second molecular orientation on front and back surfaces of a substantially planar core section, respectively, by means of thermal pressing process so that said front and second outer layers are directly adhered to said planar core section, and forming at least one recording layer on at least one of the first outer layer and the second outer layer, wherein, the first and second outer layers are selected so that the difference Δ
in the angle of orientation between the molecular orientations of the first and second outer layers is 20°
or less so that the synthetic resin card warpage is 1.5 mm or less; andthe first and second outer layers are laminated so that the thicknesses of the first and second outer layers are symmetrical with respect to the core section. - View Dependent Claims (13, 14, 15)
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Specification