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Sheet material for forming cover of e.g. catalog, has sprocket holes extending via inner layer made of fluid-resistant material till base layer that is moisturized along folding line by holes, where holes are distributed over folding length
Sheet material for forming cover of e.g. catalog, has sprocket holes extending via inner layer made of fluid-resistant material till base layer that is moisturized along folding line by holes, where holes are distributed over folding length
The sheet material (10) has a base layer made of a fluid-absorbing material, and an inner layer made of a fluid-resistant material, where the inner layer is connected with the base layer by an adhesive. The inner layer has a row of sprocket holes (22-1, 22-2, 24-1, 24-2) along a folding line of cover folds (14-1, 14-2, 18-1, 18-2) to be formed, where the sprocket holes extend through the inner layer till the base layer, and are distributed over the folding length. The base layer is moisturized along the folding line by the sprocket holes. Independent claims are also included for the following: (1) a method for forming a book cover (2) a device for forming a row of sprocket holes on an inner layer.
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