The present disclosure relates to paper rolls, and more particularly, to a method and mechanism for fixing a tail end of a paper roll.

During the production of paper rolls, a paper roll having a longer axial dimension should be processed such that its tail end is fixed on the roll before being cut into a plurality of rolls of paper having with a shorter axial dimension, to avoid the loose of the paper roll.

In the manufacturing industry of paper rolls, the tail end of the paper roll is usually bonded on the roll with glue. There are various problems in such method of fixing the tail end of the paper roll with glue. For example, the machine is easy to be soiled by the glue, it is difficult to maintain humidity and concentration of the glue, it is difficult to control the amount of glue to be applied, and there is a heavy workload for machine maintenance and cleaning.

In a Chinese patent with a publication number of CN101674993B, entitled with "Method and device for closing the tail end of a log of web material", the tail end of the paper roll is fixed by mechanical ply-bonding method. Such method may address issues caused by the use of glue, but the tail end of the paper roll is laminated with the outer layer of the paper roll. When the laminating force is relatively large, the outer layer of the paper roll is easy to be damaged, and when the laminating force is relatively small, it is easy to cause the fixing of the tail end of the paper roll insecure, so that the paper roll may be accidentally loosened in the subsequent cutting process, to cause a shutdown accident.

It is an objective of the present disclosure to provide a method for fixing a tail end of a paper roll, which can both address issues caused by the use of glue for fixing, and avoid the damage to the outer layer of the paper roll.

It is another objective of the present disclosure to provide a paper roll obtained in accordance with the method.

According to one aspect of the present disclosure, a method for fixing a tail end of a paper roll is provided, including: instead of bonding the tail end of the paper roll with glue, wrapping a circumference surface of the paper roll with a paper sheet made of material different from that of the paper roll; and joining a head and a tail ends of the paper sheet together by way of mechanical joining, instead of bonding the head and tail ends of the paper sheet together with glue, so that the tail end of the paper roll is hooped onto the paper roll.

Preferably, the mechanical joining includes any one of: laminating overlapping portions between the head and tail ends of the paper sheet to form a whole; and pressing the overlapping portions to form convex-concave patterns respectively, and the head and tail ends of the paper sheet are fitted together through the convex-concave patterns.

According to another aspect of the present disclosure, a paper roll is provided, including a tail end of the paper roll hooped onto the paper roll by a paper sheet made of material different from that of the roll of paper, without bonded with glue, the paper sheet having a head and a tail ends joined together by a mechanically joining mechanism, instead of bonded with glue.

Preferably, the mechanically joining mechanism includes any one of: a mechanism in which the overlapping portions between the head and the tail ends of the paper sheet are laminated to form a whole; and a mechanism in which the overlapping portions between the head and the tail ends of the paper sheet are pressed to form convex-concave patterns respectively, and the head and the tail ends of the paper sheet are fitted together through the convex-concave patterns..

At least one end of the head and the tail ends of the paper sheet extends from the overlapping portions to form a lateral wing.

The present disclosure has following advantages: it addresses issues caused by the use of glue for fixing the tail end of the paper roll that the machine is easy to be soiled by the glue, it is difficult to maintain humidity and concentration of the glue, it is difficult to control the amount of glue to be applied, and there is a heavy workload for machine maintenance and cleaning; and the tail end of the paper roll can be fixed without applying pressing force on the tail end of the paper roll and the outer layer of the paper roll or using other methods like that, to avoid the damage to the outer layer of the paper roll, and facilitate the improvement in the quality of the finished rolls of paper.

• FIG. 1 is a structural schematic diagram illustrating a cross section of a paper roll according to a first embodiment of the present disclosure.
• FIG. 2 is a structural schematic diagram illustrating a cross section of a paper roll according to a second embodiment of the present disclosure.
• FIGS. 3-9 respectively show various embodiments in which both head and tail ends of a paper sheet wrapping a paper roll are joined together by way of mechanical joining.

Refer to FIG. 1. It shows a paper roll 1 and a paper sheet 2 wrapping a circumference surface of the paper roll 1. In order to clearly distinguish the paper roll 1 and the paper sheet 2, it is intended to leave a large gap between the paper roll 1 and the paper sheet 2 in FIG. 1. And, in order to clearly show the tail end 1a of the paper roll 1, it is intended to draw the tail end 1a of the paper roll to have a tilted shape in FIG. 1. In fact, there is no gap between the paper roll 1 and the paper sheet 2, and the tail end 1a a of the paper roll is hooped onto the paper roll 1 by the paper sheet 2.

Both head and tail ends of the paper sheet 2 are tilted radially outwardly, to from overlapping portions 2a. In the overlapping portion 2a, both the head and the tail ends of the paper sheet 2 are joined together in a mechanically joining mechanism, instead of bonded with glue. In this embodiment, the mechanically joining mechanism is formed by applying sufficient laminating force on the overlapping portions 2a, to bond the paper fibers together, so that the both head and tail ends of the paper sheet 2 are joined together. The whole overlapping portions 2a may be joined together, and alternatively parts of the overlapping portions 2a may be joined together, for example, laminating may be performed on the overlapping portions 2a at regular intervals along the axial direction of the paper roll (i.e., a direction perpendicular to the figure), so that there is no need to join the whole overlapping portions together.

FIG. 2 shows another embodiment, which is different from FIG.1 in that the tail end 1a of the paper roll 1 and the paper sheet 2 are joined together by a mechanically joining mechanism. Other structural features of this embodiment are the same as those in FIG. 1. The mechanically joining mechanism of the tail end 1a of the paper roll 1 and the paper sheet 2 is the same as the mechanically joining mechanism of the head and tail ends of the paper sheet 2.

FIGS. 3-9 show some different embodiments in which the head and tail ends of the paper sheet 2 are joined together by way of mechanical joining. These structural schematic diagrams may be equivalent to partial enlarged view of the overlapping portions 2a of the head and tail ends of the paper sheet in FIG. 1. The following description will illustrate the different embodiments by reference to FIGS. 3-9 respectively.

In FIG. 3, the overlapping portions of the head and tail ends of the paper sheet 2 are pressed with concavo-convex patterns 3, and the head and tail ends of the paper sheet 2 are fitted together through the concavo-convex patterns.

FIG. 4 may be seen as a variation of FIG. 3. The concavo-convex patterns in FIG. 4 are bumps each of which is provided with a through-hole 4 formed by puncture with a needle or the like.

In FIG. 5, one end of the head and tail ends of the paper sheet 2, i.e., the left end in the figure is bent and wraps the other end to form a wrapping mechanism. In order to clearly show how the end of the paper sheet is bent, it is intended to leave a visible gap at the wrapping portion in FIG. 5. In fact, the head and tail ends of the paper sheet are joined together closely, without gap therebetween. The embodiments shown in FIGS. 3 and 4 may also apply the wrapping mechanism shown in FIG. 5.

In FIG. 6, both the head and tail ends of paper sheet 2 extend from the overlapping portions to form lateral wings 2b, 2c, respectively. As the advantage of such structure, it is convenient for the user to separate the joined head and tail ends of the paper sheet 2 by drawing the lateral wings 2b, 2c. Further, on the basis of FIG. 6, in FIG. 7, each of the lateral wings 2b, 2c is folded to increase the thickness of the lateral wing and enhance the strength.

In FIG. 8, one end of the head and tail ends of paper sheet 2, i.e., the left end in the figure extends from the overlapping portions to form a single lateral wing 2b. Further, on the basis of FIG. 8, in FIG. 9, the lateral wing 2b is folded to increase the thickness of the lateral wing and to enhance the strength.

The embodiments shown in FIGS. 3 and 4 may also apply the lateral wing mechanisms shown in FIGS. 6-9.