Composite printing roller set and printing paper product

Abstract

The utility model discloses a composite printing roller set and a printing paper product, and belongs to the technical field of household paper production equipment. According to the composite printing roller set, the first body paper and the second body paper are jointly gathered into the gap between the first embossing roller and the second embossing roller, the printing boss on the first embossing roller is used for pressing the surface of the first body paper, and at least one printing pattern composed of a plurality of first pressing marks is formed; the composite fine points on the second embossing roller are pressed on the surface of the second body paper and located in the area of the first indentations, and a plurality of second indentations are formed. The first indentation and the second indentation are actually obtained by thinning partial areas of respective raw paper, so that the overall thickness of the composite paper cannot be influenced, and the problems of attractiveness and thickness are well considered. In addition, the first interwoven layer and the second interwoven layer are formed at the bottom of the first indentation, so that the base paper is compounded more firmly.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of paper production equipment, more specifically, relate to a kind of composite printing roller set and printing paper product. BACKGROUND

[0002] Tissue paper is a necessity in people's daily life, and is usually composed of two or more layers of base paper. In order to enhance the water absorption and appearance of the tissue paper, many tissue papers have printed patterns on their surfaces to meet market demand. Traditional embossed tissue paper is usually bonded by spraying glue, but the glue is toxic and corrosive, so using such tissue paper can harm people's health. In addition, the glue will harden after solidification, affecting the feel of use.

[0003] To solve the defects caused by the above-mentioned glue coating, some glue-free composite paper products and equipment have appeared in the market. The main working principle is to extrude multiple base papers by mechanical pressure, so that the fibers of the base papers interweave together, thereby forming a glue-free composite.

[0004] In some schemes, a "point-to-plane" glue-free composite method is used, that is, the base paper is pre-embossed to form a pattern; then, a plurality of composite protrusions on the surface of one printing roller and the flat surface of another smooth roller extrude and composite the pattern area of the pre-embossed base paper.

[0005] Although this "point-to-plane" composite method can realize glue-free composite of paper, when the two base papers are pressed at the cutting point of the printing roller and the smooth roller, the pattern on the base paper near the smooth roller will be extruded to a certain extent, resulting in unclear pattern and poor embossing effect.

[0006] In some schemes, a "point-to-point" glue-free composite method is used, that is, the base paper is pre-embossed to form a pattern; then, a plurality of composite protrusions on the surface of one printing roller and a plurality of composite protrusions on the surface of another printing roller extrude and composite in the pre-embossed pattern area.

[0007] This composite method can effectively avoid damage to the pre-embossed pattern and ensure the integrity of the pre-embossed pattern. However, this "point-to-point" composite method has high precision requirements for the relative position of the composite protrusions on the two printing rollers, and needs to ensure that the composite protrusions on the two roller bodies are in one-to-one correspondence, thereby greatly increasing the operation difficulty of actual production.

[0008] In view of the above problems, the prior art has appeared "fine line composite" technology, that is, first, a plurality of printing bosses on the printing roller cooperates with the rubber roller to form a pre-printing pattern on the base paper; then the printing bosses on the printing roller cooperates with the composite fine points on another fine line roller to form a plurality of composite points in the pre-printing pattern area. Thus, the integrity of the printing pattern can be well ensured, and the position requirement between the printing boss and the composite fine point is reduced.

[0009] It can be seen that the prior art has related disclosure on the glue-free composite embossing technology, but there is still room for optimization. For example, in the existing glue-free composite embossing technology, each layer of base paper is pre-formed with a pattern (generally formed by extrusion of printing bosses on the rubber roller and the printing roller) before being compressed, and then the recessed part of the pattern is compressed to form a composite, so that the composite paper will form an air layer between adjacent composite areas. Although the existence of the air layer can improve the appearance of the composite paper, it will also make the volume of the composite paper too large, thereby adversely affecting the saving of packaging materials and transportation costs. Especially for small packages of paper products carried by hand, the thickness of the single paper towel is increased in the same packaging space, which sacrifices the number of paper towels, thereby greatly reducing the satisfaction of customers. Practical new type content

[0010] 1. Problem to be solved

[0011] In view of the problem that the existing glue-free composite device cannot well balance the appearance and thickness, the utility model provides a composite printing roller set and a printed paper product. In the utility model, the base paper is compressed to form an embossed pattern with a certain shape by using the thickness of the base paper itself, and the thickness of the base paper is not increased, so that the appearance and thickness are well balanced.

[0012] 2. Technical scheme

[0013] In order to solve the above problems, the technical scheme adopted by the utility model is as follows:

[0014] A composite embossing method of the utility model,

[0015] The roller set adopted has a first printing roller and a second printing roller, the roller surface of the first printing roller is provided with a plurality of printing bosses, and the roller surface of the second printing roller is densely distributed with a plurality of composite fine points at intervals;

[0016] During processing, the distance H between the top of the printing boss and the roller surface of the second printing roller is controlled to be less than the overlapping thickness of the base paper; the first base paper and the second base paper are jointly fed into the gap between the first printing roller and the second printing roller, and the first base paper and the second base paper are extruded by the first printing roller and the second printing roller to complete the printing and composite work at the same time;

[0017] The printing boss is pressed on the surface of the first base paper to form at least one printing pattern composed of a plurality of first indentations; and the composite fine point corresponding to the printing boss is pressed on the surface of the second base paper to form a plurality of second indentations.

[0018] In some embodiments, a second interlaced layer is formed in the area where the bottom of the first indentation does not overlap with the second indentation.

[0019] In some embodiments, the height of the composite fine point is greater than the thickness of the second base paper, so that the second indentation formed by the composite fine point can be more clearly presented on the first base paper.

[0020] In some embodiments, the height of the composite fine point is 0.05-0.2mm.

[0021] In some embodiments, the first base paper and / or the second base paper is pre-pressed with a plurality of third indentations; the plurality of third indentations form a printing pattern or a concave point with a certain shape.

[0022] In some embodiments, the pressing depth of the third indentation is less than the pressing depth of the first indentation, and when the third indentation is in the area of the printing boss, it can be further pressed and combined on the first indentation.

[0023] The utility model discloses a composite printing roller group, including mutually abutting first flower roller and second flower roller, the roller surface of first flower roller forms a plurality of printing bosses, and the roller surface of second flower roller is densely distributed with a plurality of composite fine points at intervals, wherein,

[0024] The distance H between the top of the printing boss and the roller surface of the second flower roller is 0.08-0.28mm, so that the first pressing area is formed between the printing boss and the composite fine point, and the fine point is formed on the paper and filled in the corresponding line of the printing boss; the second pressing area is formed between the printing boss and the roller surface of the second flower roller.

[0025] In some embodiments, the height of the composite fine point protruding from the roller surface of the second flower roller is 0.10mm-0.25mm.

[0026] In some embodiments, the pressing area of the composite fine point is less than 0.1mm 2 , and the gap between adjacent composite fine points is 0.05-0.5mm.

[0027] In some embodiments, further comprising at least one set of pre-embossing roller group composed of a third embossing roller and a rubber roller, the third embossing roller is distributed with a plurality of pre-embossing protrusions; wherein the pre-embossing protrusions form an embossing pattern with a certain shape, or a series of protrusions, or a combination of embossing pattern and protrusions.

[0028] In some embodiments, the height of the pre-embossing protrusions is less than the height of the embossing protrusions.

[0029] In some embodiments, the height of the embossing protrusions is 0.8-2.5mm; the height of the pre-embossing protrusions is 0.5-2.0mm.

[0030] The utility model discloses a kind of composite embossing roller groups, including mutually abutting first embossing roller and second embossing roller, the roller surface of the first embossing roller is equipped with a plurality of embossing protrusions, the roller surface of the second embossing roller is distributed with a plurality of composite fine points at interval densely;Wherein,

[0031] The embossing protrusions and the composite fine points form first pressing area, which forms fine points on paper and fills in the corresponding texture of embossing protrusions, and the second pressing area is formed between the embossing protrusions and the roller surface of the second embossing roller, and the height of the composite fine points protruding from the roller surface of the second embossing roller is 0.08-0.28mm.

[0032] The utility model discloses a kind of embossed paper products, including mutually laminated first base paper and second base paper, the first base paper, second base paper is formed with first indentation and second indentation on the opposite surface under the mechanical pressing of the same roller group;Wherein,

[0033] The densely distributed second indentation fills in the first indentation area, and first interlaced layer is formed in the overlapping area of two indentations.

[0034] In some embodiments, the bottom of the first indentation and the non-overlapping area of the second indentation form a second interlaced layer.

[0035] In some embodiments, the part of the first base paper and the second base paper in the first indentation area is in a mutually laminated state, and the part in the non-first indentation area is in a mutually adhered state, and the depth of the first indentation and the second indentation does not exceed the thickness of the respective base paper.

[0036] In some embodiments, third indentation is formed on the first base paper and / or the second base paper, the area of the third indentation is greater than the area of the second indentation, and the third indentation forms an embossing pattern with a certain shape, or a series of concave points, or a combination of embossing pattern and concave points.

[0037] In some embodiments, the third impression is a series of concave dots, and the concave dots fill the entire area of the base paper surface not having the first impression, or the concave dots and the first impression form a patterned area with a boundary therebetween.

[0038] 3. Advantages

[0039] Compared with the prior art, the present application has the following advantages:

[0040] (1) The composite embossing method of the present application can emboss the first paper with the first impression and the second paper with the second impression, and simultaneously complete the composite operation between the two papers, by using the thickness of the base paper itself. Since the first impression and the second impression are actually obtained by compressing the partial area of the respective base paper, they will not affect the overall thickness of the composite paper, thus well balancing the appearance and thickness. In addition, the first interlaced layer and the second interlaced layer are formed at the bottom of the first impression, thus making the composite between the base papers more firm.

[0041] (2) The composite embossing roller set of the present application can complete the embossing and composite operation between the base papers simultaneously by the cooperation of the two rollers, without the need for pre-embossing to obtain the embossed paper product with the embossed pattern. This ensures the appearance of the paper product while not excessively increasing the thickness of the paper product. In addition, by controlling the distance between the top of the embossing boss and the roller surface of the second roller, the composite area between the base papers can be greatly improved to ensure the firmness of the composite between the base papers. At the same time, the risk of excessive wear or even breakage of the composite dots due to the large pressing force required for embossing can be eliminated.

[0042] (3) The embossed paper product of the present application can form an embossed pattern with a certain shape on the surface of the first base paper through the first impression, and the shape of the second impression can be presented on the first base paper through the first impression, which can effectively enrich the appearance of the paper product. At the same time, the part between the first base paper and the second base paper in the first impression area is in a mutual layering state, which can effectively ensure the layering area. The part between the first base paper and the second base paper in the non-first impression area is in a mutual adhering state, which avoids the existence of air layer, thus being conducive to ensuring the thickness of the composite paper. BRIEF DESCRIPTION OF DRAWINGS

[0043] Figure 1 FIG. 1 is a structural schematic view of a composite embossing roller set of the present application;

[0044] Figure 2 FIG. 2 is a partial enlarged view of position A in FIG. 1; Figure 1

[0045] Figure 3 FIG. 4 is a cooperation schematic view of the first roller and the second roller after the roller surface is unfolded in the present application; ​

[0046] Figure 4 It is another structural schematic view of a composite printing roller set in the utility model;

[0047] Figure 5 It is a structural schematic view of a printing paper product in the utility model;

[0048] Figure 6 It is Figure 5 It is a local enlarged schematic view of B in the middle.

[0049] Figure 7 It is a distribution mode of concave points on the printing paper product in the utility model;

[0050] Figure 8 It is another distribution mode of concave points on the printing paper product in the utility model.

[0051] In the figure: 100, first printing roller; 110, printing boss;

[0052] 200, second printing roller; 210, composite fine point;

[0053] 300, pre-embossing roller set;

[0054] 400, first base paper; 410, first indentation;

[0055] 500, second base paper; 510, second indentation;

[0056] 610, first interlaced layer; 620, second interlaced layer. DETAILED DESCRIPTION

[0057] In order to further understand the content of the utility model, the utility model is described in detail in combination with the drawings.

[0058] In the description of the utility model, it should be explained that the orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like is the orientation or position relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0059] The prior art appears "fine line composite" technology, that is, first, a plurality of printing bosses on a printing roller cooperates with a rubber roller to form a pre-printing pattern on the base paper; then the printing bosses on the printing roller cooperates with a plurality of composite fine points on another fine line roller to form a plurality of composite points in the area of the pre-printing pattern; since the size of the composite points is small and the pressure is large during pressing, fine line points can be easily formed. The advantage is that the integrity of the printing pattern can be easily controlled and the position requirement between the printing bosses and the composite fine points is reduced. However, the thickness of the product is large and the amount of paper contained in the same volume is reduced.

[0060] To solve the problem of thickness, an optimization scheme that can be thought of is to change the smooth roller to a fine line roller to cooperate with the printing roller to reduce the thickness. However, due to the problem of pressure, the fine line will be quickly worn out; if the pressure is small, the front pattern cannot be clearly displayed, which makes this scheme unable to be applied in actual production.

[0061] The utility model provides a kind of composite printing roller set and printing paper product, and its main point is that printing pattern is formed on the surface of printing paper product, and is filled with fine point, improves definition degree.Simultaneously, it needs to be indicated that the printing pattern in the utility model can be graphics, character or the combination of both, and can be determined according to actual needs.

[0062] The utility model will be further described below in combination with specific embodiment.

[0063] The first base paper 400 and the second base paper 500 are overlapped and are pressed by the first printing roller 100 and the second printing roller 200 to complete printing and composite work simultaneously. The roller surface of the first printing roller 100 is provided with a plurality of printing bosses 110, and the plurality of printing bosses 110 can be combined into at least one printing pattern. The roller surface of the second printing roller 200 is densely distributed with a plurality of composite fine points 210 at intervals, and the pressing surface area of the printing boss 110 is more than twice the area of the composite fine point 210, so that each printing boss 110 can be extruded and cooperated with a plurality of composite fine points 210. At the same time, the distance H between the top of the printing boss 110 and the roller surface of the second printing roller 200 is less than the overlapping thickness of the base paper.

[0064] It is worth mentioning that the first base paper 400 and the second base paper 500 in the embodiment can be single-layer base paper or multi-layer base paper, which is not limited here.

[0065] The specific steps of the composite embossing method of the embodiment are as follows.

[0066] The first base paper 400 and the second base paper 500 are jointly fed into the gap between the first printing roller 100 and the second printing roller 200, and the printing convex 110 is used to press the surface of the first base paper 400 to form at least one printing pattern composed of a plurality of first impressions 410.

[0067] The composite fine points 210 are used to press the surface of the second base paper 500 in the area of the first impressions 410 to form a plurality of second impressions 510. Since the distance H between the printing convex 110 and the roller surface of the second printing roller 200 is smaller than the superimposed thickness of the jointly fed base papers, the first interlaced layer 610 can be formed by pressing in the area where the bottom of the first impression 410 and the second impression 510 overlap between the first base paper 400 and the second base paper 500. In the area where the bottom of the first impression 410 and the second impression 510 do not overlap, the multi-layer base paper is also pressed to form a second interlaced layer 620, and the pressing force of the first interlaced layer 610 is greater than that of the second interlaced layer 620 to ensure the firmness of the composite between the first base paper 400 and the second base paper 500.

[0068] It should be noted that the distance H between the printing convex 110 and the roller surface of the second printing roller 200 can be adjusted according to the thickness (i.e. the number of layers) of the base paper to be compounded. When single-layer base paper is used for compounding, the distance H can be appropriately reduced; when multi-layer base paper is used for compounding, the superimposed thickness of each base paper also increases; at this time, the value of the distance H can be appropriately increased to form deeper impressions, so that the printing pattern formed by the impressions is clearer and has stronger three-dimensionality.

[0069] In the embodiment, the first base paper 400 and the second base paper 500 are both double-layer base papers. Since the first base paper 400 and the second base paper 500 in the embodiment are not pre-printed, the superimposed thickness of each base paper can be approximately regarded as the sum of the thicknesses of the base papers. That is, the superimposed thickness of the four base papers in the embodiment is about 0.2-0.28 mm (usually 11-14 g per layer of facial tissue paper, and the thickness is about 0.05-0.07 mm), so the distance H between the printing convex 110 and the roller surface of the second printing roller 200 can be controlled within the range of 0.08-0.28 mm, for example, 0.09 mm, 0.14 mm, 0.20 mm, 0.26 mm, etc. The control of the distance ensures the clarity of the impressions and the pressure during compounding, and also ensures that the base paper is not broken.

[0070] In some embodiments, the height of the composite fine points 210 should be greater than the thickness of the second base paper 500. At the same time, under the premise that the second base paper 500 is not broken, the height of the composite fine points 210 should be as large as possible to make the second impressions 510 formed by the composite fine points 210 more clearly present on the first base paper 400, so as to further ensure the clarity of the printing pattern.

[0071] But considering that in the present embodiment, the printing and the compounding are carried out synchronously, in order to be able to press to form the indentations on the original thickness of the base paper, the pressing pressure between the two pattern rollers is greater than the pressure in the traditional method of pre-pressing the pattern and then compounding. At this time, if the height of the compounding fine points 210 is too large, it will cause the compounding fine points 210 to be excessively worn or even broken. Therefore, in the present embodiment, the height of the compounding fine points 210 is controlled to be 0.05-0.2 mm, for example, 0.06 mm, 0.13 mm, 0.18 mm, etc. On the one hand, it can ensure the clarity of the indentations, and on the other hand, it is beneficial to prolong the service life of the compounding fine points 210.

[0072] In addition, in some cases where there is no strict requirement on the thickness of the package, such as kitchen paper and bathroom paper, before the first base paper 400 and the second base paper 500 are merged into the two pattern rollers for printing and compounding, the first base paper 400 can be pre-pressed with a plurality of third indentations to further enrich the appearance of the printed paper product and improve its water absorption. Of course, the second base paper 500 can also be pre-pressed with a plurality of third indentations.

[0073] The third indentation will be further described in detail below by taking the first base paper 400 with the third indentation as an example. The third indentation described above can form a pattern with a certain shape, or can form a series of concave points on the paper surface, or a combination of the two, etc. At the same time, it should be noted that when the third indentation is used to form a pattern, the third indentation needs to be staggered with the first indentation 410 to prevent the pre-formed third indentation from being damaged when the first indentation 410 is pressed.

[0074] In some embodiments, in order to minimize the impact on the overall thickness of the printed paper product, the pressing depth of the third indentation can be less than the pressing depth of the first indentation 410.

[0075] The compounding and embossing method of the present embodiment is essentially to utilize the thickness of the superimposed base paper to press the first indentation 410 on the first base paper 400 and the second indentation 510 on the second base paper 500, and at the same time to complete the compounding operation between the two base papers. Since the first indentation 410 and the second indentation 510 are actually obtained by pressing the partial area of each base paper, they will not affect the overall thickness of the compounded paper, thus well balancing the problems of appearance and thickness; at the same time, it also makes the printed pattern have high clarity.

[0076] In order to implement the compounding and embossing method described above, the present embodiment provides a compound printing roller set.

[0077] As Figure 1 , Figure 2As shown, the composite printing roller set of the embodiment comprises a first printing roller 100 and a second printing roller 200 which abut against each other and have opposite rotating directions. The first printing roller 100 has a plurality of printing bosses 110 formed on the roller surface, and the plurality of printing bosses 110 form at least one printing pattern with a certain shape. The second printing roller 200 has a plurality of composite dots 210 densely and intermittently distributed on the roller surface. Meanwhile, at the composite position, the composite dots 210 and the printing bosses 110 cooperate with each other to press and composite the first raw paper 400 and the second raw paper 500 which flow into the composite position, and a series of fine lines are filled in the lines formed by the printing bosses 110. The "composite position" herein refers to the position where the first printing boss 110 and the second printing boss 210 rotate to a position where the gap between the first printing boss 110 and the second printing boss 210 is the smallest, and the first raw paper 400 and the second raw paper 500 flow into the composite position to be pressed and composited, and the position is the composite position. Meanwhile, it should be noted that the distance H between the pressing surface of the printing boss 110 and the roller surface of the second printing roller 200, and the distance h between the pressing surface of the printing boss 110 and the pressing surface of the composite dot 210 are both for the composite position.

[0078] In some embodiments, the printing boss 110 described above can be in the shape of a dot or a line. The line-shaped printing boss 110 can be a straight line, a curve, or a combination thereof. Meanwhile, the line-shaped printing boss 110 can be segmented, or can extend through the entire axial direction of the first printing roller 100, or a combination thereof, and the specific formation and size of the line-shaped printing boss 110 are subject to the printing pattern to be formed, and are not limited herein.

[0079] In some embodiments, the composite dot 210 described above can be in the shape of a dot or a line, but the pressing surface of the composite dot 210 is smaller than that of the printing boss 110. The specific pressing area of the composite dot 210 can be determined according to actual production requirements. Generally, the pressing surface area of the composite dot 210 is not more than 0.2 mm 2 , and when the composite dot 210 is in the shape of a line, the length and width of the pressing surface of the composite dot 210 are not more than 0.6 mm. It should be noted that the pressing surface herein refers to the end surface of the printing boss 110 and the composite dot 210 which abut against each other at the composite position, and can also be understood as the top of each. Meanwhile, the plurality of composite dots 210 do not form a printing pattern with a certain shape, but only re-outline and press composite in the area of the printing pattern formed by the printing boss 110. It can also be understood that the plurality of composite dots 210 do not form a new printing pattern, but only outline the inside of the printing pattern formed by the printing boss 110, so that the printing pattern formed by the printing boss 110 can be more clearly presented on the front and back surfaces of the composite paper product.

[0080] Specifically, as Figure 3 ,Figure 5 As shown, (for ease of display, Figure 3 In this embodiment, at the composite position, the spacing h between the pressing surface of the printing boss 110 and the pressing surface of the composite point 210 is less than the superimposed thickness D of the first base paper 400 and the second base paper 500, so that a first pressing area can be formed between the printing boss 110 and the composite point 210. When the first base paper 400 and the second base paper 500 do not have patterns formed in advance, the superimposed thickness D is the superposition of the thicknesses of the respective base papers.

[0081] When the first base paper 400 and the second base paper 500 jointly flow into the first pressing area, the printing boss 110 presses the first base paper 400 to form a first indentation 410 that is concave from the outside to the inside as a whole. The composite point 210 presses the second base paper 500 to form a second indentation 510 that is concave from the outside to the inside as a whole, and a first interlaced layer 610 is formed at the intersection of the second indentation 510 and the first indentation 410. In the area of the first interlaced layer 610, the fibers of the first base paper 400 and the second base paper 500 interweave with each other, so that the two base papers are combined together in a layered state.

[0082] In this embodiment, the first indentation 410 and the second indentation 510 are actually formed by thinning the portions of the respective base papers at the composite position. Therefore, the first indentation 410 is formed while not protruding from the inner surface of the first base paper 400. Therefore, the thickness of the first base paper 400 is not increased. At the same time, since the second indentation 510 is formed in the area covered by the first indentation 410, the second indentation 510 does not form a completely new pattern, but in the case of a relatively thin base paper, the shape of the second indentation 510 can be presented on the first base paper 400 through the first indentation 410, so that the pattern formed by the first indentation 410 is more delicate and clear, and the stereoscopic effect is stronger, greatly increasing the aesthetic appeal of the composite paper.

[0083] In some embodiments, at the composite position, the spacing H between the pressing surface of the printing boss 110 and the surface of the second printing roller 200 (i.e., the concave area between adjacent printing bosses 110) is also less than the superimposed thickness D of the first base paper 400 and the second base paper 500, so that a second pressing area can be formed between the printing boss 110 and the surface of the second printing roller 200. When the first base paper 400 and the second base paper 500 jointly flow into the second pressing area, the flowing base papers can also be extruded and combined to form a second interlaced layer 620. Although the pressing strength of the second interlaced layer 620 is less than that of the first interlaced layer 610, it can also have a composite effect.

[0084] Similarly, the second interlaced layer 620 is formed by compressing two base papers, and thus does not increase the thickness of the base papers. That is, the paper after compounding is in a laminated state at the bottom of the entire first indentation 410, greatly increasing the laminated area between the base papers, and effectively improving the firmness of the compound. At the same time, the part of the paper after compounding in the area other than the first indentation 410 is in a mutually adhering state, so that the overall thickness is approximately the same as the laminated thickness before compounding.

[0085] In some embodiments, the distance H between the pressing surface of the printing boss 110 and the roller surface of the second printing roller 200 at the compounding position is 0.08-0.28mm. This is because the thickness of a single base paper is generally about 0.05-0.07mm, and when both the first base paper 400 and the second base paper 500 are single base papers, the laminated thickness D is about 0.10-0.14mm. At this time, the value of H is the minimum value of 0.08mm, which is not only smaller than the laminated thickness of 0.10mm, but also ensures that the base paper is subjected to sufficient extrusion force in the second pressing area to form the second interlaced layer 620. Since the compounding point 210 protrudes from the roller surface of the second printing roller 200, the distance between the compounding point 210 and the printing boss 110 is smaller than H, so that the incoming base paper is subjected to greater extrusion force in the first pressing area to form the first interlaced layer 610 with better pressing effect. Of course, the specific size of the value of H can be adjusted according to the actual laminated thickness of the first base paper 400 and the second base paper 500.

[0086] In some embodiments, in order to ensure that the second indentation 510 on the second base paper 500 can be more clearly presented on the first base paper 400, the height of the compounding point 210 should be as large as possible under the premise that the second base paper 500 is not broken, so that the second indentation 510 formed by the compounding point 210 can be more clearly presented on the first base paper 400, to further improve the appearance of the printed paper.

[0087] However, considering that in the present embodiment, printing and compounding are performed simultaneously, in order to be able to press the indentation on the original thickness of the base paper, the pressing between the two printing rollers needs to be greater than the traditional pre-pressing pattern. At this time, if the compounding point 210 has a large height, it will cause excessive wear of the compounding point 210, and even breakage.

[0088] To this end, in the present embodiment, the height of the composite fine point 210 is controlled in the range of 0.06mm-0.25mm, preferably 0.10mm-0.20mm, on the basis of the interval H between the pressing surface of the printing boss 110 and the roller surface of the second printing roller 200 being 0.08-0.28mm. For example, 0.13mm, 0.17mm, 0.19mm, etc. On the one hand, the clarity of the pressure mark can be ensured, and on the other hand, the service life of the composite fine point 210 can be prolonged. In the present embodiment, the first base paper 400 and the second base paper 500 are both two-layer base papers, and the height of the composite fine point 210 protruding from the roller surface of the second printing roller 200 is preferably about 0.15mm, for example, 0.14mm, 0.15mm, 0.16mm, etc. That is, in the present embodiment, the clarity of the second pressure mark 510 on the first base paper 400 is not excessively required. However, when 2-8 base papers are used for compounding, the second pressure mark 510 can also be presented on the first base paper 400.

[0089] In some embodiments, in order to reduce the friction loss of the composite fine point 210, the first printing roller 100 and the second printing roller 200 have different diameters, so that the composite fine points 210 at different positions are alternately extruded and matched with the printing boss 110, thereby effectively prolonging the service life of the composite fine point 210.

[0090] Meanwhile, the hardness of the printing boss 110 and the composite fine point 210 is 50-70HRC. The selection of this hardness is on the one hand to ensure that the printing boss 110 and the composite fine point 210 have a certain strength to meet the needs of compounding, and on the other hand, to prevent the printing boss 110 and the composite fine point 210 from being easily broken due to excessive hardness.

[0091] Further, since the composite fine point 210 is alternately extruded and matched with the printing boss 110, in order to ensure the synchronicity of the wear of the composite fine point 210 and the printing boss 110, the hardness of the printing boss 110 can be slightly greater than that of the composite fine point 210. Preferably, the hardness of the printing boss 110 is controlled in the range of 55-65HRC, and the hardness of the composite fine point 210 is controlled in the range of 50-60HRC.

[0092] In some embodiments, since the friction loss of the composite fine point 210 is effectively controlled, the composite fine point 210 can be made smaller, and the compounding area thereof can be less than 0.1mm 2 , for example, 0.02mm 2 , 0.05mm 2 , 0.07mm 2 , 0.09mm 2etc. The composite fine points 210 of smaller size can draw more densely within the printing pattern area formed by the printing boss 110, which is equivalent to filling the printing pattern area with more fine points, or in other words, forming more "pixels", thereby effectively improving the printing pattern resolution, making the printing pattern look more realistic and clear. However, if the fine points are too densely filled, visual fatigue will occur when observed, making the printing pattern feel less clear. In addition, if the fine points are too densely filled, i.e. the spacing between adjacent composite fine points 210 is too small, it will be not conducive to the formation of the second interlaced layer 620. In particular, for some kitchen and bathroom paper with relatively thick fibers, at this time, if the spacing between adjacent composite fine points 210 is too small, the base paper is difficult to be squeezed into the spacing, thereby affecting the formation of the second interlaced layer 620. Therefore, in the present embodiment, the spacing between adjacent composite fine points 210 is controlled within the range of 0.05-0.5mm, for example, 0.08mm, 0.14mm, 0.22mm, 0.35mm, 0.45mm, etc. Preferably, 0.15mm-0.3mm, for example, 0.18mm, 0.25mm, etc. In the present embodiment, by reasonably controlling the size and spacing of the composite fine points 210, the clarity of the printing pattern can be ensured, and the formation of the second interlaced layer 620 will not be affected, so as to ensure the firmness of the composite between the base papers.

[0093] Preferably, the composite fine points 210 are overall columnar structures, and the pressing surface of the composite fine points 210 is a square structure. The length and width of the square pressing surface are both 0.1-0.3mm, for example, 0.12mm, 0.18mm, 0.26mm, etc. At the same time, the spacing between adjacent composite fine points 210 is controlled within the range of 0.08-0.25mm, for example, 0.12mm, 0.18mm, 0.23mm, etc. Compared with the traditional spherical pressing surface, since the square pressing surface is a plane, the pressing force on the base paper within the entire pressing area of the pressing surface is more uniform, thereby being conducive to ensuring the composite effect.

[0094] Specifically in the present embodiment, the height of the composite fine points 210 is 0.2mm, and the spacing between adjacent composite fine points 210 is 0.15mm. The pressing surface of the composite fine points 210 is overall a square structure of 0.2mm*0.2mm. At the same time, in order to prevent the edges and corners of the square pressing surface from easily scratching the base paper, the edges and corners of the square pressing surface can be rounded.

[0095] Reference Figure 4As shown, as another embodiment of a composite printing roller set of the present embodiment, it comprises a pre-embossing roller set 300 and a composite roller set composed of the above-mentioned first embossing roller 100 and second embossing roller 200. The pre-embossing roller set 300 can be provided with one set for pre-embossing the first base paper 400 or the second base paper 500. The pre-embossing roller set 300 can also be provided with two sets for pre-embossing the first base paper 400 and the second base paper 500 respectively to form third embossing on the respective base paper.

[0096] Specifically, the pre-embossing roller set 300 comprises a third embossing roller and a rubber roller abutting against each other, and a plurality of pre-printing protrusions are formed on the roller surface of the third embossing roller. The pre-printing protrusions can be arranged in a certain pattern shape to enrich the pattern shape of the composite paper and enhance its aesthetic feeling. At this time, in order to prevent the pre-printing protrusions from being damaged by being pressed again in the later composite process, the pattern formed by the pre-printing protrusions on the base paper should be staggered with the pattern formed by the printing protrusions 110.

[0097] Of course, the pre-printing protrusions can also not form a certain pattern shape. That is, the pre-printing protrusions are not intended to form a certain pattern on the base paper, but only form a plurality of "concave points" on the base paper for increasing the hand feeling and water absorption of the composite paper. At this time, there is no need to consider the staggering relationship between the "concave points" and the pattern formed by the printing protrusions 110. It is only necessary to ensure that the height of the printing protrusions 110 is greater than the height of the pre-printing protrusions, so that the "concave points" previously formed on the base paper are destroyed when the composite printing roller set is pressed and new embossing is formed. However, regardless of which structure form the pre-printing protrusions adopt, the mutual cooperation of the third embossing roller and the rubber roller will inevitably make the thickness of the base paper thicker. Therefore, it can be applied to the production of some printing paper products which do not have strict requirements on thickness.

[0098] In some embodiments, in order to control the thickness of the paper within an acceptable range as much as possible, the height of the pre-printing protrusions should be less than the height of the printing protrusions 110. Preferably, the height of the pre-printing protrusions is 0.5-2.0mm, for example, 0.6mm, 1.3mm, 1.7mm, etc. The height of the printing protrusions 110 is 0.8-2.5mm to meet the requirement of some kitchen paper and toilet paper to have deep embossing. For example, 1.1mm, 1.6mm, 2.3mm, etc.

[0099] This embodiment of a composite printing roller assembly utilizes the cooperation of two printing rollers to simultaneously complete the printing and lamination operations between various base papers. Printed paper products with printed patterns can be obtained without pre-printing, ensuring the aesthetic appeal of the paper products without excessively increasing their thickness. Furthermore, by controlling the distance between the top of the printing protrusion 110 and the roller surface of the second printing roller 200, the height of the composite fine dots 210 protruding from the roller surface of the second printing roller 200 does not exceed 0.2mm. This significantly increases the lamination area between the base papers, ensuring the strong bonding between them. Simultaneously, it eliminates the risk of excessive wear or even breakage of the composite fine dots 210 caused by the large pressing force required for printing.

[0100] refer to Figure 5 , Figure 6 As shown, this embodiment also provides a printed paper product, including a first base paper 400 and a second base paper 500 laminated together. Under mechanical pressing by the same roller group, the first base paper 400 and the second base paper 500 respectively form a plurality of first indentations 410 and a plurality of second indentations 510 on their opposite surfaces. Each of the plurality of first indentations 410 can form at least one printed pattern, and each first indentation 410 is filled with a plurality of densely distributed second indentations 510. Simultaneously, a first interlacing layer 610 is formed at the junction of the first indentations 410 and the second indentations 510, thereby connecting the first base paper 400 and the second base paper 500 together.

[0101] For ease of description below, the surfaces of the first base paper 400 and the second base paper 500 that are close to each other are defined as the inner surfaces of their respective base papers, and the surfaces that are far apart from each other are defined as the outer surfaces of their respective base papers.

[0102] like Figure 5 As shown, when observing the printed paper product from the outer surface of the first base paper 400, in addition to seeing the pattern formed by the first embossing 410, one can also see the densely packed second embossings 510 through the first embossing 410. Furthermore, since the second embossings 510 are distributed at the bottom of the first embossing 410, and the area of ​​the second embossings 510 is much smaller than that of the first embossing 410, when observing the printed paper product from the outer surface of the first base paper 400, several small dots can be seen at the bottom of the first embossing 410, making the first embossing 410 clearer and also giving it a stronger three-dimensional effect. Similarly, when observing the printed paper product from the outer surface of the second base paper 500, one can also see the pattern formed by the densely packed second embossings 510, which is actually obtained by the second embossings 510 outlining the bottom of the first embossing 410.

[0103] Further, the first base paper 400 and the second base paper 500 are also formed with a second interlaced layer 620 at the bottom of the first indentation 410 and in the area of the non-second indentation 510. That is, the second base paper 500 and the portion of the first base paper 400 in the area of the first indentation 410 are in a mutual interlaced state, so that the composite of the two is more firm. Meanwhile, when the first base paper 400 and the second base paper 500 are not pre-pressed, the portions of the printed paper product in the area of the non-first indentation 410 are in a mutual adhering state. That is, at this time, the thickness of the printed paper product is basically the same as the thickness of the first base paper 400 and the second base paper 500 when they are mutually superimposed.

[0104] In order to further improve the aesthetics of the printed paper product, the first base paper 400 and the second base paper 500 can be pre-pressed, that is, the first base paper 400 and the second base paper 500 can be pre-formed with a third indentation on the first base paper 400 before being jointly extruded and combined. The third indentation can form a patterned design with a certain shape; it can also not form a patterned design with a certain shape, but only present a series of "dimple" points on the base paper; it can also be a combination of "dimple" points and patterns, that is, part of the third indentation forms a patterned design, and part of the third indentation forms a dense "dimple" point.

[0105] Of course, in order to ensure the integrity of the pattern, the patterned design formed by the pre-printing needs to be staggered with the patterned design formed by the first indentation 410. At the same time, in order to minimize the impact on the overall thickness of the printed paper product, the pressing depth of the third indentation can be less than the pressing depth of the first indentation 410.

[0106] Reference Figure 7 As shown in some embodiments, the third indentation is a series of dimple points, and the dimple points fill the entire area of the non-first indentation 410 on the surface of the base paper.

[0107] Reference Figure 8 As shown in some embodiments, the third indentation is a series of dimple points, and the dimple points do not fill the entire area of the non-first indentation 410 on the surface of the base paper, but are delimited from the area of the first indentation 410 forming the printed pattern, so that the printed pattern is more prominent and has a stronger three-dimensional effect. Of course, the third indentation can also be pre-formed on the second base paper 500.

[0108] The printed paper product of the embodiment can form a printed pattern with a certain shape on the surface of the first base paper 400 through the first indentation 410, and the shape of the second indentation 510 can be presented on the first base paper 400 through the first indentation 410, which can effectively enrich the appearance of the paper product and improve the clarity of the printed pattern; meanwhile, the parts of the first base paper 400 and the second base paper 500 in the first indentation area 410 are in a mutual layering state, which can effectively ensure the layering area; and the parts in the area without the first indentation 410 are in a mutual adhering state, avoiding the existence of air layer, thereby being beneficial to ensuring the thickness of the paper after compounding.

[0109] In addition, it should be noted that, although the existence of the first interlaced layer 610 and the second interlaced layer 620 can be obviously seen from the drawings. The drawings are only for the convenience of understanding the scheme of the present application, which does not mean that the first interlaced layer 610 and the second interlaced layer 620 must be detected. It can be understood that the existence of the first interlaced layer 610 and the second interlaced layer 620 is to compound the base paper. Therefore, when separating the base papers of the printed paper product after compounding, it can be felt that the base papers are mutually adhered in the corresponding area, which can be considered as the existence of the first interlaced layer 610 and the second interlaced layer 620.

[0110] The above description of the present application and its embodiments is illustrative, and the description is not restrictive, and the embodiments shown in the drawings are only one of the embodiments of the present application, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired by the above description, without departing from the creative purpose of the present application, similar structural modes and embodiments can be designed without creativity, which should belong to the protection scope of the present application.

Claims

1. A composite printing roller set comprising a first printing roller (100) and a second printing roller (200) which abut against each other, a plurality of printing bosses (110) being formed on the roller surface of the first printing roller (100), characterized in that: The second roller (200) is provided with a plurality of composite dots (210) distributed densely and spaced apart on the roller surface. The distance H between the top of the printing boss (110) and the roller surface of the second roller (200) is 0.08-0.28 mm, so that the printing boss (110) and the composite dots (210) form a first pressing area, which forms dots on the paper and fills in the corresponding pattern of the printing boss (110); and the printing boss (110) and the roller surface of the second roller (200) form a second pressing area.

2. A composite printing roller set according to claim 1, characterized in that: The height of the composite fine point (210) protruding from the roller surface of the second embossing roller (200) is 0.10mm-0.25mm; the pressing area of the composite fine point (210) is less than 0.1mm 2 , and the gap between adjacent composite fine points (210) is 0.05-0.5mm.

3. A composite printing roller set according to claim 1 or 2, characterized in that: Further comprising at least one pre-embossing roller group (300) composed of a third roller and a rubber roller, the third roller is provided with a plurality of pre-printing bosses; wherein the pre-printing bosses form a printing pattern with a certain shape, or a series of bumps, or a combination of printing patterns and bumps.

4. A composite printing roller set according to claim 3, characterized in that: The height of the pre-printing boss is less than the height of the printing boss (110).

5. A composite printing roller set according to claim 4, wherein: The height of the printing boss (110) is 0.8-2.5 mm; the height of the pre-printing boss is 0.5-2.0 mm.

6. A composite printing roller set comprising a first pattern roller (100) and a second pattern roller (200) abutting each other, the first pattern roller (100) being provided with a plurality of printing bosses (110) on the roller surface, characterized in that: The second roller (200) is provided with a plurality of composite dots (210) distributed densely and spaced apart on the roller surface. The printing boss (110) and the composite dots (210) form a first pressing area, which forms dots on the paper and fills in the corresponding pattern of the printing boss (110); and the printing boss (110) and the roller surface of the second roller (200) form a second pressing area; and the height of the composite dots (210) protruding from the roller surface of the second roller (200) is 0.08-0.28 mm.

7. A printed paper product comprising a first base paper (400) and a second base paper (500) layered on each other, characterized in that: The first base paper (400) and the second base paper (500) are respectively provided with a first indentation (410) and a second indentation (510) on their opposite surfaces under the mechanical pressing of the same roller group; wherein, The densely distributed second indentations (510) fill in the area of the first indentation (410) and form a first interlaced layer (610) in the overlapping area of the two indentations.

8. A printed paper product according to claim 7, characterized in that: In the non-overlapping area of the bottom of the first indentation (410) and the second indentation (510), a second interlaced layer (620) is formed.

9. A printed paper product according to claim 7, characterized in that: The portions of the first base paper (400) and the second base paper (500) in the area of the first indentation (410) are in a mutual layering state; the portions in the area other than the first indentation (410) are in a mutual adhering state; and the depth of the first indentation (410) and the second indentation (510) does not exceed the thickness of the respective base paper.

10. A printed paper product according to claim 7, characterized in that: A third indentation is formed on the first base paper (400) and / or the second base paper (500), the area of the third indentation is larger than that of the second indentation (510); the third indentation forms a printing pattern with a certain shape, or a series of concave points, or a combination of printing patterns and concave points.

11. A printed paper product according to any one of claims 7 to 10, characterized in that: The third indentation is a series of concave points, and the concave points fill in the entire area of the base paper surface other than the first indentation (410), or there is a boundary between the concave points and the area of the printing pattern formed by the first indentation (410).

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