Synthetic resin card and method of producing the same
First Claim
1. A synthetic resin card comprising:
- a substantially planar core layer; and
a first outer layer and a second outer layer laminated on front and back surfaces of the core layer, respectively, wherein the difference δ
in the angle of orientation between the first and second outer layers is 20°
or less; and
at least one of the first and second outer layers is provided with a recording layer.
1 Assignment
0 Petitions
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.
26 Citations
12 Claims
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1. A synthetic resin card comprising:
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a substantially planar core layer; and
a first outer layer and a second outer layer laminated on front and back surfaces of the core layer, respectively, wherein the difference δ
in the angle of orientation between the first and second outer layers is 20°
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, 9, 10, 11)
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8. (canceled)
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12. A method for producing a synthetic resin card comprising laminating a first outer layer and a second outer layer on front and back surfaces of a substantially planar core layer,
wherein the first and second outer layers are selected so that the difference δ - in the angle of orientation between the first and second outer layers is 20°
or less;
the 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 layer; and
a recording layer is formed on at least one of the first outer layer and the second outer layer.
- in the angle of orientation between the first and second outer layers is 20°
Specification