Sheet Product Comprising at Least Two Plies Joined by Gluing with Non-Uniform Distribution of the Glue

Abstract

The sheet product, such as paper, wound in a roll, comprises at least two plies (V1, V2) joined together by gluing, at least one of which is embossed. The product has longitudinal bands or areas (1, 3) which are characterized by a different quantity of glue, with more glue in proximity to the edges.

Description

TECHNICAL FIELD [0001] The present invention relates to sheet products, with two or more plies joined to one another by gluing, for example and in particular (although not exclusively) made of tissue paper. [0002] More specifically, the invention relates to sheet products especially of the type wound in a roll, such as kitchen towels, toilet paper and the like. STATE OF THE ART [0003] In the production of toilet paper, kitchen towels and other products made of tissue paper or creped paper, two or more plies of paper joined to one another by ply-bonding or gluing are normally used. When the plies are joined by gluing they are normally embossed, that is, subjected to permanent mechanical deformation with the formation of protuberances on the plies. The glue is applied to the front surface of the protuberances of at least one of the two plies and the plies thereby embossed and provided with glue are laminated between two embossing rollers or between one embossing roller and one laminat...

AI Technical Summary

Benefits of technology

[0007] The object of the present invention is to produce a product which reduces or eliminates, either entirely or partly, the drawbacks mentioned above.

[0008] More specifically, the object of the present invention is to produce a multi-ply tissue paper product wherein distribution of the glue is optimized to join the plies adequately, with a reduction of the negative consequences of the glue on the characteristics of softness and / or on the absorption capacities of the product.

[0010] The invention is based on the idea that to join the plies forming the finished product glue only requires to be distributed in areas, and that during use the paper product is utilized in different ways from area to area. The invention is thus based on the idea of reducing the quantity of glue in those areas where it can have a negative effect on the characteristics of softness and / or absorption capacities of the product, concentrating the presence of the glue mainly along the edge areas.

[0011] In fact, in the case of toilet paper, for example, it is always used prevalently in the central area of the sheets of paper, while in normal use the edge areas are not utilized. Therefore, a quantity of glue concentrated on the edge areas does not reduce the characteristics of softness in the area of the product, which comes into contact with the user. On the other hand, the glue applied along the edges, or prevalently along the edges, guarantees optimum joining of the plies.

[0012] Also in the case of kitchen towels, the presence of glued longitudinal edge areas and intermediate areas devoid of glue or in any case having a smaller quantity of glue attains the aforesaid advantages of increased softness and absorption capability with respect to traditional products, thanks to the reduction in the quantity of glue especially in the intermediate areas, that is, in the central areas of the product.

[0013] In the specific case of kitchen towels, it is advantageous to provide S supplementary glued areas, having an extension essentially parallel to the longitudinal edges, so that the finished product in substance has more than two glued bands or areas disposed along the longitudinal edges and in intermediate positions with respect to the transverse extension of the product. By producing these areas wherein gluing is concentrated by means of more evident embossing, for example, linear embossings with greater height with respect to micro-embossing distributed over the entire remaining surface of the product, the kitchen towel can attain further advantages. In fact, the presence of areas with more evident and glued embossing increases grip of the hand on the sheet of paper resulting in an increased cleaning effect, useful when the product is used, for example, to clean or dry the surfaces of furniture, dishes or other objects. The presence of embossings in a central area of the product, especially if obtained with continuous instead of discontinuous projections, makes it possible to obtain a sort of scoring effect and thus invites folding of each sheet of kitchen towel, with further advantages during use.

Problems solved by technology

In the first place the glue—being an expendable material—increases the cost of the finished product.

In the second place, the presence of glue decreases the softness of the product, which becomes more rigid, and has a negative influence on the absorption capacities thereof.

However, these measures are not always sufficient to obtain a product with the desired softness and / or having the desired characteristics of absorption.

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