Tissue printing pressing roller

Abstract

A working surface of the paper towel printing pressure roller is composed of smooth cylindrical surfaces at two ends and a knurling surface in the middle, and the knurling surface is provided with line grooves which are densely arranged in parallel or a pattern part which is formed by staggering the line grooves which are densely arranged in parallel. The device is used on a paper towel printing machine and is matched with a patterned surface roller which is relatively provided with convex points to stamp paper towels, so that the problem of paper layer dispersion can be solved.

Description

Technical Field

[0001] This utility model relates to the field of paper towel manufacturing machinery technology, and in particular to a machine part used in a paper towel printing machine to press an unfolded wide roll of paper towel raw material onto a roller with patterned raised dots on its surface. Background Technology

[0002] Existing tissue printing machines use a pressure roller with patterned raised dots on its surface to press unfolded tissue rolls against the printing roller. The working surface of this roller is a smooth cylindrical surface. According to the requirements of tissue embossing, the raised dots on the roller that works with the pressure roller are very small, typically 0.1-0.2 mm in height, and the top surface of the raised dots is also small, generally 0.6-0.7 mm in length and width. Therefore, existing pressure rollers have the following shortcomings when printing on tissue rolls: Since tissue rolls are composed of multiple layers of soft paper, after being pressed by the pressure roller and the roller, the printed tissues suffer from paper layer dispersion. This is especially problematic when using small-diameter pressure rollers or when printing on tissue rolls made primarily of sugarcane bagasse or bamboo pulp; the resulting paper layer dispersion can be so severe that the printed tissues become unusable. Utility Model Content

[0003] This invention provides a paper towel printing roller to solve the problem of paper layer dispersion when printing with existing paper towel printing rollers.

[0004] To solve the above problems, the working surface of the paper towel printing pressure roller of this utility model is composed of smooth cylindrical surfaces at both ends and an embossing surface in the middle. The embossing surface has closely arranged parallel grooves. The groove depth H = 0.1-0.2mm, the groove top width T = 0.1-0.3mm, and the groove top opening width T1 = 0.2-0.3mm. The diameter of the cylindrical surface is D, and the groove top diameter of the embossing surface is D1, where D ≥ D1.

[0005] In the aforementioned paper towel printing pressure roller, the width L of the cylindrical surface is ≥ 5 mm, and the diameter D of the cylindrical surface is preferably 90-120 mm; the groove can be a rectangular groove with the same bottom width as the top opening width or a trapezoidal groove with a bottom width T2 smaller than the top opening width T1.

[0006] To solve the above problems, the paper towel printing pressure roller of this utility model can also have a working surface composed of smooth cylindrical surfaces at both ends and an embossing surface in the middle. The embossing surface has a pattern formed by multiple sets of closely arranged parallel grooves. The groove depth H1 = 0.1-0.2mm, the groove top width T1 = 0.1-0.3mm, the diameter of the cylindrical surface is D2, and the groove top diameter of the embossing surface is D3, where D2 ≥ D3.

[0007] In this scheme, the width L2 of the cylindrical surface is ≥ 5 mm, and the diameter D2 of the cylindrical surface of the paper towel printing pressure roller is preferably 90-120 mm. The groove can be a rectangular groove whose cross-section is the same as the bottom width and the top opening width, or it can be a trapezoidal groove whose bottom width T2 is less than the top opening width T1.

[0008] By adopting the above technical solution, this utility model has the following beneficial effects compared with the prior art:

[0009] The working surface of the tissue printing pressure roller consists of a smooth cylindrical surface and an embossing surface in the middle. This embossing surface has parallel, closely spaced grooves or multiple sets of parallel, closely spaced grooves intersecting to form patterns. The grooves have a depth of 0.1-0.2 mm and a top width of 0.1-0.3 mm. This structure allows multiple layers of soft tissue paper to be pressed onto the embossed roller with raised patterns on its surface. This results in multiple indentations on the raised patterns of the embossed roller, thus completely preventing the tissue paper from separating after printing. Attached Figure Description

[0010] Figure 1 This is a front view of the paper towel printing pressure roller of Embodiment 1 of this utility model.

[0011] Figure 2 This is a right view of the paper towel printing pressure roller of Embodiment 1 of this utility model.

[0012] Figure 3 yes Figure 2 A magnified view of a section at point B.

[0013] Figure 4 yes Figure 1 Sectional view at point C.

[0014] Figure 5 yes Figure 4 A magnified view of a section at point D.

[0015] Figure 6 A schematic diagram of the parallel groove structure of Embodiment 2 of this utility model. Detailed Implementation

[0016] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments:

[0017] Example 1: Paper towel printing pressure roller with closely spaced parallel rectangular grooves

[0018] Figures 1 to 5The tissue printing pressure roller shown is mounted on the outside of the roller shaft during use. Its working surface consists of smooth cylindrical surfaces at both ends and an embossing surface in the middle. The width of the cylindrical surfaces is L, where L = 5 mm, and the width of the embossing surface is 120 mm. The embossing surface has closely spaced parallel grooves. These parallel grooves are rectangular grooves with a bottom width equal to the top opening width. The groove depth is H, where H = 0.1 mm, and the top width is T, where T = 0.17 mm. The diameter of the cylindrical surfaces is D, where D = 110 mm, and the top diameter of the grooves in the embossing surface is D1, where D = 110 mm. D is greater than or equal to D1 to prevent damage to the grooves on the embossing surface. In other embodiments, the diameter D of the cylindrical surface can be determined according to the length of the tissue printing pressure roller, so as to ensure that the tissue printing pressure roller does not bend under working pressure and the degree of deformation is less than one-fifth of the groove depth. When the length of the tissue printing pressure roller is less than 250 mm, the diameter D of this cylindrical surface is 90-120 mm, which does not affect the printing quality and can effectively prevent the paper layer from being dispersed when printed.

[0019] Example 2: A paper towel printing pressure roller with closely spaced parallel trapezoidal grooves.

[0020] Figure 6 The paper towel printing pressure roller shown has closely spaced parallel trapezoidal grooves. Except for the parallel grooves being trapezoidal grooves wider at the top and narrower at the bottom, its structure and shape are completely identical to those in Example 1. In this example, the depth of the trapezoidal grooves is H1, H1 = 0.15 mm, the top width is T, T = 0.17 mm, the top opening width is T1, T1 = 0.3 mm, and the bottom width is T2, T2 = 0.2 mm. The bottom width being smaller than the top width helps prevent paper layer dispersion in the printed paper towels.

[0021] For this type of paper towel printing pressure roller with closely spaced parallel trapezoidal grooves, in other embodiments, as long as the groove top width T is controlled within the range of 0.1-0.3 mm, the groove top opening width T1 is controlled within the range of 0.1-0.3 mm, and the groove depth H1 is controlled within the range of 0.1-0.2 mm, the paper layer dispersion of the printed paper towel can be effectively prevented.

[0022] In the above embodiments 1 and 2, the parallel grooves of the paper towel printing pressure roller of this utility model are all circular parallel grooves along the generatrix of the cylinder. In other embodiments, they can also be elliptical annular parallel grooves along the outer contour of the oblique section of the cylinder, or multiple sets of grooves formed by the intersection of two sets of elliptical annular parallel grooves.

Claims

1. A tissue printing impression roll characterized by: The working surface consists of smooth cylindrical surfaces at both ends and an embossed surface in the middle. The embossed surface has closely spaced parallel grooves with a groove depth H = 0.1-0.2 mm and a groove top width T = 0.1-0.3 mm. The diameter of the cylindrical surface is D, and the groove top diameter of the embossed surface is D1, where D ≥ D1.

2. The towel printing press roll of claim 1 wherein: The width L of the cylindrical surface is ≥ 5 mm, and the diameter D of the cylindrical surface is 90-120 mm.

3. A towel printing pressure roller according to claim 1 or 2, characterised in that: The groove is a rectangular groove with the same width at the bottom as the width of the opening at the top.

4. A printing pressure roller for paper towels according to claim 1 or 2, characterized in that: The groove is a trapezoidal groove with a bottom width T2 that is smaller than the top opening width T1.

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