| 摘要 |
A reinforcement device to be incorporated to punched folder sheets which increases paper resistance around the punched areas of the folder sheet and reduces their deterioration. In one embodiment, a reinforcement strip is added during the manufacturing process so as to reinforce the area of the punched hole. The reinforcement strip may be added before or after punching the holes, and may be a continuous or non-continuous strip. The reinforcement device may be used with a variety of paper sizes or weights, and may be made of a variety of materials, for example, polyurefin, PVC film or polyamide.
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