Composite point arrangement structure of composite net roller

Abstract

According to the composite point arrangement structure of the composite net roller, two innovative arrangement modes, namely interval arrangement and disordered arrangement, of composite points on the surface of the composite net roller are matched with precise composite point parameter design, and a synergistic effect is formed with main flower points of an embossing roller; through the design of high-density composite points, accurate arrangement and 10%-60% of contact area proportion, the defects of pressure concentration, roller body abrasion, product hardening and peduncle formation and the like caused by existing composite point arrangement are overcome, the performance balance of soft hand feeling, full and clear patterns, firm lamination and perforation resistance of an embossed product is achieved, and meanwhile the service life of the roller body is prolonged. The structure is adaptive to short-fiber low-gram-weight base paper, is high in process stability and has remarkable industrial application value and market competitiveness.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of paper processing, in particular to a composite point arrangement structure of a composite screen roller. BACKGROUND

[0002] In the field of paper embossing processing, convex-to-net point roller embossing is one of the mainstream composite processes, and its core relies on the embossing of the composite points on the surface of the composite screen roller and the main flower points of the embossing roller to realize the compounding and embossing of multiple base papers. However, the arrangement of the composite points of the existing composite screen roller has significant defects, which makes it difficult to balance product quality and roller life: On the one hand, the existing composite points are mostly arranged in a spiral or regular array, and in the long-term embossing process, the contact position between the composite points and the main flower points is fixed and the pressure is concentrated, which will repeatedly extrude the surface of the main flower points to form a tooth-shaped groove, not only damaging the integrity of the main flower points and causing the pattern to deform and blur, but also exacerbating the wear of the roller body and shortening the service life. On the other hand, if the pressure is dispersed to expand the gap between the composite points, the density of the composite points will be insufficient, the main flower pattern will be easily incomplete, and the total area ratio of the composite points will be insufficient, resulting in poor lamination firmness and easy perforation. If the number of composite points is simply increased without optimizing the arrangement, it will form a local hard area, causing the product to feel hard and not meeting the needs of high-end products.

[0003] Therefore, there is an urgent need for an innovative composite point arrangement structure to solve the core problems of "pressure concentration, roller wear, pattern defects, and hard feel" from the root. SUMMARY

[0004] The present application aims to overcome the shortcomings of the prior art and provide a composite point arrangement structure of a composite screen roller, which realizes uniform pressure dispersion, roller wear resistance, soft product feel, and complete pattern through two innovative arrangement methods (layered array interval arrangement, disordered distributed arrangement) and precise composite point parameter design. In order to achieve the above-mentioned purpose, the present application provides a composite point arrangement structure of a composite screen roller, which is applied to a composite screen roller for embossing and compounding of multiple base papers. The surface of the composite screen roller is provided with a plurality of composite points, wherein the area of each composite point is 0.01-0.05 mm², and the area ratio of all composite points on the surface of the composite screen roller is 10%-60%. The arrangement method of the composite points is interval arrangement, and the "layered array unit" is the basic arrangement unit. A plurality of layered array units are arranged in an interval distribution on the surface of the composite screen roller. A single layered array unit is composed of a plurality of nested sub-units, and each layer of sub-units is arranged in an interval distribution along the radial direction or a preset track of the layered array unit. Each layer of sub-units is arranged in an interval distribution along the contour track of the sub-unit. Further, the relative position relationship between two adjacent said hierarchical array units is any one of tangential, local overlap or spaced arrangement.

[0005] Further, when two adjacent said hierarchical array units are locally overlapped, the area of the overlapping region is ≤ 30% of the area of a single hierarchical array unit.

[0006] Further, each layer of said sub-units can be coaxially arranged or arranged differently; the shape of each layer of said sub-units is any one of a closed contour of a circular ring, a triangle or an ellipse.

[0007] Further, the contour size of each layer of said sub-units increases sequentially along the radial direction of the hierarchical array unit, and the number of complex points of the outer sub-units is more than that of the inner sub-units.

[0008] Further, the remaining area of the surface of the complex screen roller except the covered area of the hierarchical array units is fully covered with a plurality of complex points, and the parameter characteristics of the complex points in this area are consistent with those of the complex points (21) in the hierarchical array units.

[0009] A complex point arrangement structure of a complex screen roller, applied to a complex screen roller for multi-layer base paper embossing and compounding, wherein the surface of the complex screen roller is provided with a plurality of complex points, the area ratio of all complex points on the surface of the complex screen roller is 10%-60%, and the surface size D2 of each complex point is 0.01-0.05 mm²; the arrangement mode of the complex points is disordered arrangement, the complex points are randomly distributed without fixed unit boundaries on the surface of the complex screen roller, and the surface size, adjacent gap and embossing height of each complex point independently and randomly fluctuate within a preset parameter range.

[0010] Further, when disordered arrangement is adopted, the fluctuation range of the surface size of the complex points is 0.01-0.05 mm², and the fluctuation range of the adjacent gap is 0.04-0.15 mm.

[0011] The above-mentioned scheme has the beneficial effects that: 1) uniform pressure dispersion: both arrangement modes avoid fixed concentration of complex points, the compounding pressure is dispersed to multiple small contact points through hierarchical nesting and random distribution design, the product hardening and stringing problems are solved, and the hand feeling is soft; 2) prolong the service life of the roller body: the non-fixed contact point design reduces the repeated friction between the main flower points and the complex points, and the service life of the roller body is prolonged by more than 60% compared with the prior art. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is a schematic diagram of a fine line compounding and embossing device.

[0013] Figure 2 It is a local enlarged schematic view of the main flower points and the complex points.

[0014] Figure 3Schematic diagram of parameter characteristics of primary flower points and composite points.

[0015] Figure 4 Schematic diagram of the roll surface development of a composite roll.

[0016] Figure 5 Schematic diagram of a single layered array unit.

[0017] Figure 6 Schematic diagram of the relative relationship of two adjacent layered array units as tangential arrangement.

[0018] Figure 7 Schematic diagram of the relative relationship of two adjacent layered array units as local overlapping arrangement.

[0019] Figure 8 Schematic diagram of the relative relationship of two adjacent layered array units as interval arrangement.

[0020] Figures 9 to 11 Schematic diagram of layered array units of different closed contour forms.

[0021] Wherein, 1 - embossing roll, 2 - composite roll, 11 - primary flower point, 21 - composite point, A0 - layered array unit. DETAILED DESCRIPTION

[0022] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the accompanying drawings. The preferred embodiments of the present application are shown in the drawings. However, the present application can be realized in many different forms and is not limited to the embodiments described herein. The purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0023] Referring to the accompanying drawings Figures 1-2 As shown in the drawings, in the present embodiment, a composite point arrangement structure of a composite roll is applied to a composite roll 2 for embossing and compounding of multi-layer base paper, wherein the multi-layer base paper (at least two layers of stacked base paper) passes through the roll gap between the embossing roll 1 and the composite roll 2, and is embossed and compounded together by the roll pressing cooperation of the two, thereby forming a texture pattern on the surface.

[0024] In the present embodiment, the embossing roll 1 is provided with a primary flower pattern composed of a plurality of primary flower points 11 arranged in an interval (the primary flower pattern here can be set according to actual product requirements), wherein the dot structure of the primary flower pattern satisfies the following characteristics: Feature one: the area size D1 of each main dot 11 is 0.15-0.9 mm2, which breaks through the design inertia of the prior art "main dot 11 is large" (the area size of the main dot 11 in the prior art is mostly ≥1.0 mm2), and through setting the area size D1 range, the key of "pattern clarity" and "softness" is considered. If the area size D1 of the main dot 11 is >0.9 mm2, even if the contact area ratio is controlled, the absolute contact area of a single main dot 11 is still too large, which is easy to cause local hardening; if the area size D1 of the main dot 11 is <0.15 mm2, the main dot 11 is easy to have insufficient engraving precision due to too small size, and the pattern is blurred.

[0025] Feature two: the area ratio of all main dots 11 on the surface of the embossing roller 1 is 1.5%-10%, which discards the misunderstanding of the prior art "high ratio for pattern integrity", and the ratio range balances the visual effect and process stability through "point density control". When the ratio is >10%, the distance between the main dots 11 is too close, and continuous hard areas are easy to form after compounding; when the ratio is <1.5%, the main dots 11 are sparse, which leads to incomplete pattern, and the embossing roller 1 is easy to vibrate due to uneven stress.

[0026] Feature three: the gap L1 between any two adjacent main dots 11 is 0.3-1 mm, which forms an optimal gap ratio of "1:0.5-1:6.7" with the area size D1 of the main dot 11. The gap L1 is the core of the "stress release channel". When the gap L1 is <0.3 mm, the base paper between the main dots 11 has not enough space to release the compression elongation, which is easy to cause hidden creping; when the gap L1 is >1 mm, the distance between the main dots 11 is too large, which leads to discrete pattern and poor visual continuity. For example, when the 0.4 mm2 area size D1 of the main dot 11 is matched with the 0.5 mm gap L1, the elongation stress release rate reaches 90%, and there is no creping phenomenon.

[0027] Feature four: the embossing height H1 of the main dot 11 is 0.3-0.65 mm, which is special for adapting to the fiber strength characteristics of short fiber base paper. Different base paper thickness corresponds to the setting of the adaptive embossing height H1 of the main dot 11, that is, for thin base paper (corresponding thickness 0.15-0.3 mm), the embossing height H1 can be 0.3-0.45 mm, and for thick base paper (corresponding thickness 0.3-0.7 mm), the embossing height H1 can be 0.46-0.65 mm. When the embossing height H1 is too high, the point collapse phenomenon is easy to occur, and the maintenance cost is high, while when the embossing height H1 is too low, the dot is not durable, and the service life is short. Finally, the pattern has poor three-dimensionality, penetrates the paper, and the edge produces burr, etc. Paper quality problems.

[0028] The preferred range of the above-mentioned main flower point 11 parameters is that the area size D1 is 0.3-0.6 mm2, the area ratio is 3%-7%, and the embossing height H1 is 0.35-0.65 mm (the preferred height is determined by the thickness of the raw paper, and selecting an appropriate embossing height H1 can form clear indentations on the short fiber raw paper, while the perforation rate is low, the wear resistance is good, and the service life is high). This combination is verified by orthogonal experiments to optimize the overall performance of the product. The shape of the main flower point 11 can be circular, square, diamond, or irregular polygon, and the size error of a single main flower point 11 is controlled within ±0.05 mm2 to ensure pattern consistency.

[0029] In the present embodiment, the composite roller 2 surface is provided with a high-density distribution of composite points 21, wherein the composite points 21 meet the following characteristics: Characteristic one: the area size D2 of each composite point 21 is 0.01-0.05 mm2, which is special in that it breaks through the problem of "composite point 21 size is rough" in the prior art - the area size of the composite point 21 in the prior art is mostly ≥0.2 mm2, which easily leads to a high single composite point contact ratio, while the small size composite point in the present application ensures that the contact ratio is 10-60% through high-density distribution, and avoids local pressure concentration. An area size D2 <0.01 mm2 that is too small can cause insufficient processing precision (low laser engraving pass rate). The range of the area size D2 here is a balance between "precise control of contact ratio" and "processing feasibility": 0.01 mm2 is the critical value of processing precision (laser engraving pass rate ≥95%), and 0.05 mm2 is the upper limit critical value of contact area (which can stably control the contact ratio ≤60% in cooperation with the main flower point 11).

[0030] Characteristic two: the area ratio of all composite points 21 on the composite roller 2 surface is 10%-60%, which is special in that it discards the design mistake of "giving priority to main flowers and ignoring composite points" in the prior art - the area ratio of the composite point 21 in the prior art is mostly <10%, which only relies on the main flower point 11 to achieve lamination, resulting in insufficient firmness. This ratio is the optimal interval for "overall engagement strength" and "roller load": a ratio ≥10% can form dense engagement points, and in cooperation with the main flower point 11 contact area, it can achieve "multiple point distributed load bearing"; a ratio ≤60% can avoid pressure concentration on the composite roller 2 surface (roller surface pressure ≤0.8 MPa), prolonging the service life.

[0031] Characteristic three: the gap L2 between any two adjacent composite points 21 is 0.04-0.15 mm, which is special in that it forms a "1:0.5-1:1.5" golden density ratio with the area size of the composite point 21, ensuring that the composite points 21 are evenly distributed and have no functional interference. When the gap L2 <0.04 mm, the composite points 21 are prone to edge sticking during processing or use, resulting in abnormal contact area; when the gap L2 >0.15 mm, the density of the composite points 21 is insufficient, and they cannot cover the 10%-60% contact requirement of the main flower point 11.

[0032] Feature four: the embossing height H2 of the composite point 21 is 0.06-0.12 mm, which is special in forming a "1:2-1:16" gradient design with the embossing height H1 (0.3-0.65 mm) of the main embossing point 11, avoiding "height conflict" and strengthening "mechanical occlusion". When the height is <0.06 mm, the composite point 21 is only attached to the surface of the base paper; when the height is >0.12 mm, the composite point 21 is easy to penetrate the base paper and directly rigidly contact with the main embossing point 11, leading to accelerated wear of the embossing roller 1.

[0033] The above parameters of the composite point 21 and the main embossing point 11 form precise coordination - through the design of "small size composite point 21 + high density distribution", a structural support for a contact area ratio of 10%-60% is provided, finally realizing the characteristics of "soft hand feeling" and "firm lamination". Specifically, the embossing composite is through the pressing mode of the embossing of the main embossing point 11 and the composite point 21, the core of which is to control the actual contact area ratio between a single main embossing point 11 and a plurality of composite points 21 to be 25%-40% of the area of a single main embossing point 11. The contact area ratio is not randomly selected, but is obtained through a 3-factor 4-level orthogonal experiment, with the main embossing point 11 surface size D1, the composite point 21 density, and the pressing pressure as variables, and the hand hardness (Shore hardness) and the lamination peel strength as evaluation indexes, finally determining the above ratio interval as the optimal parameter range.

[0034] In order to facilitate understanding of the above "contact area ratio of 10%-60% of the main embossing point 11 and the composite point 21", the following further explains and describes.

[0035] The fundamental contradiction of the prior art lies in the "imbalance between contact area and product performance": 100% full contact can ensure firm lamination, but the pressure concentration leads to the close gathering of base paper fibers, which inevitably causes hardening and knotting; while the contact area <20%, the composite point 21 is not firmly occluded, leading to decreased lamination strength and easy perforation. Based on this, the present embodiment controls the contact area ratio to be 10%-60%, realizing the balance between "pressure dispersion" and "firm occlusion": Pressure dispersion level: the composite point 21 only contacts part of the area of the main embossing point 11, avoiding the concentration of pressure in the whole area of the main embossing point 11, reducing the degree of extrusion of base paper fibers, improving the softness of the hand feeling, and at the same time, the elongation of the base paper can be released through the non-contact area of the main embossing point 11, completely solving the problem of knotting; Firm occlusion level: a contact area of 25%-40% ensures that the composite point 21 and the main embossing point 11 form sufficient mechanical occlusion, and in combination with the 10%-60% high area ratio of the composite screen roller, the overall lamination strength is guaranteed, and the anti-perforation performance is significantly improved.

[0036] In the present embodiment, the main dot 11 has a size D1 (0.15-0.9 mm2) as the "basic carrier" of the contact area. If the main dot 11 is too large, even if the contact ratio is unchanged, the actual contact area will be too large, resulting in hardness. The composite dot 21 has a size D2 (0.01-0.05 mm2) and a high-density distribution (gap L2 0.04-0.15 mm), which provides a guarantee for "precise contact" and ensures that the composite dot 21 can uniformly cover 25%-40% of the area of the main dot 11, avoiding contact blind areas or excessive overlap. Therefore, the contact area ratio is not an isolated parameter, and it needs to be precisely coordinated with the size and density of the main dot 11 and the composite dot 21.

[0037] Further, in order to facilitate the understanding of the above contact area, the following is verified and explained in combination with specific orthogonal experiments.

[0038] The calculation formula is: contact area ratio (%) = (actual total contact area of a single main dot 11 and composite dot 21 ÷ area of a single main dot 11) x 100%, wherein the area of a single main dot 11 (i.e. the nominal surface size of the main dot 11) can be calculated by measuring the maximum circumscribed contour size of the main dot 11 using a diameter gauge; the actual total contact area of a single main dot 11 and composite dot 21: after pressing, the area of the composite dot 21 indentation area on the surface of a single main dot 11 is measured by a high-precision fiber scope combined with image recognition software.

[0039] Based on the above calculation method, the orthogonal experiment data with the main dot 11 size D1 = 0.4 mm2 and the composite dot 21 size D2 = 0.012 mm2 as the basic parameters are shown in the following table: According to the experimental data, only when the contact area ratio is 25%-40%, the product meets the requirements of "hand hardness ≤30HA, laminated peeling strength ≥0.8 N / 25 mm, and no starting" at the same time, verifying the non-obviousness and necessity of the parameter range.

[0040] In order to facilitate explanation, the following further explains and describes in combination with specific implementation cases.

[0041] Implementation Case One: 1. Roller body preparation: the embossing roller 1 is processed by laser engraving to form a plurality of main flower points 11 on the roller surface, wherein the main flower points 11 satisfy the following characteristics: the main flower points 11 have a surface size D1 of 0.4 mm2 (diameter 0.71 mm, size error ±0.03 mm), the center distance between adjacent main flower points 11 is 1.21 mm (gap L1 is 0.5 mm), the embossing height H1 is 0.4 mm (height error ±0.02 mm), and the area ratio of all main flower points 11 on the surface of the embossing roller 1 is 5%. The composite mesh roller 2 is processed by laser engraving to form circular composite points 21, wherein the composite points 21 satisfy the following characteristics: the composite points 21 have a surface size D2 of 0.012 mm2, the center distance between adjacent composite points 21 is 0.22 mm (gap L2 is 0.096 mm), the embossing height H2 is 0.08 mm, and the area ratio of all composite points 21 on the surface of the composite mesh roller 2 is 32%.

[0042] 2. Selection of base paper: short fiber low grammage paper (usually 8-20 g / m2, thin base paper with a thickness of only 0.07-0.13 mm) is selected, and multiple layers of low grammage paper are stacked.

[0043] 3. Product detection: the embossed composite finished paper is detected according to the following standards: ① Hand hardness: 10 points are randomly selected in the embossed area using a Shore A hardness tester, and the average value is 29HA; ② Pattern definition: observed through a 10 times magnifying glass, the edges of the main flower points 11 are not blurred; ③ Laminated peeling strength: tested by a tensile testing machine, the average value is 0.9 N / 25 mm; ④ Picking and perforation: observed by the naked eye (distance 50 cm) and measured by a thickness gauge (accuracy 0.001 mm), the thickness difference of the embossed area is ≤0.05 mm, there is no picking, and the perforation rate is 0. The product meets the high-end standard of GB / T 20808-2011 "Tissue Paper".

[0044] Implementation case two: 1. Roller body preparation: the embossing roller 1 is processed by laser engraving to form a plurality of main flower points 11 on the roller surface, wherein the main flower points 11 satisfy the following characteristics: the main flower points 11 have a surface size D1 of 0.6 mm2 (edge length 0.77 mm), the center distance between adjacent main flower points 11 is 1.57 mm (gap L1 is 0.8 mm), the embossing height H1 is 0.45 mm, and the area ratio of all main flower points 11 on the surface of the embossing roller 1 is 7%. The composite mesh roller 2 is processed by laser engraving to form circular composite points 21, wherein the composite points 21 satisfy the following characteristics: the composite points 21 have a surface size D2 of 0.05 mm2, the center distance between adjacent composite points 21 is 0.24 mm (gap L2 is 0.093 mm), the embossing height H2 is 0.12 mm, and the area ratio of the composite points 21 is 40%.

[0045] 2. Base paper selection: short fiber low basis weight paper (usually 8-20 g / m², thin base paper with a thickness of only 0.07-0.13 mm) is selected, and multiple layers of low basis weight paper are stacked.

[0046] 3. Product testing: the embossed and compounded finished paper is tested according to the following standards: ① Hand hardness: 10 points are randomly selected in the embossed area and measured by a Shore A hardness tester, and the hand hardness is 30HA; ② Pattern definition: observed by a 10x magnifying glass, the main flower point 11 edge has no blur; ③ Laminated peeling strength: tested by a tensile testing machine, the average value is 1.1 N / 25 mm; ④ Picking and perforation: observed by the naked eye and measured by a thickness gauge, the embossed area thickness difference is ≤0.05 mm, there is no picking, and the perforation rate is 0. The product meets the high-end standard of GB / T 20808-2011 "Tissue Paper".

[0047] Comparative Example 1 - Comparative experiment using convex-to-flat roller process: the same main flower point 11 parameters and base paper as in Example 1 are used, and only the compound mesh roller 2 is replaced with a flat roller, the compounding pressure is 0.5 MPa, and the other parameters are the same. The product testing results are: hand hardness 52HA (far exceeding the standard of ≤30HA of the present application), continuous longitudinal picking (picking height 0.15 mm) occurs in the main flower point 11 area, the laminated peeling strength is 1.0 N / 25 mm, although the firmness meets the standard, the softness and appearance cannot meet the medium and high-end requirements.

[0048] Comparative Example 2 - Comparative experiment using convex-to-dot roller process: The same main flower point 11 parameters and base paper as in Example 1 are used, and the compound mesh roller 2 is replaced with a prior art dot roller (compound dot 21 face size 0.25 mm², gap 0.3 mm, area ratio 20%), and the compounding pressure is 0.5 MPa. The detection results are: the contact area ratio of main flower point 11 and compound dot 21 is 18%, the hand hardness is 39HA, but the laminated peeling strength is only 0.6 N / 25 mm, the main flower pattern is partially incomplete due to the large gap of compound dot 21, the perforation rate is 1.2%, and it cannot meet the firmness and integrity requirements.

[0049] Through the comparative experiments of Example 1, Example 2, Comparative Example 1 and Comparative Example 2, the superiority of the core process of "small size main flower point 11 + high density compound dot 21 + 10%-60% contact area ratio" is verified, and the specific summary is as follows: Core process parameter difference comparison table Based on the core performance data of Example 1 and Comparative Examples 1 and 2, the advantages of the present application lie in the "balance of contradictory properties": 1. Balance between feel and strength: Comparative Example 1 (smooth roller) has a peel strength of 1.0 N / 25 mm but a hardness of 52 HA, while Comparative Example 2 (traditional dot roller) has a hardness of 31 HA but a peel strength of only 0.6 N / 25 mm; while Implementation Case 1 achieves "hardness of 29 HA + peel strength of 0.9 N / 25 mm", which is both soft and strong, solving the pain point of existing technology that is "hard but not strong, strong but hard".

[0050] 2. Pattern integrity: In contrast to Example 2, the pattern is incomplete due to the large gap (0.3mm) between composite dots 21; in Implementation Case 1, the high-density distribution of composite dots 21 (0.1mm gap) balances visual effect and service life.

[0051] In summary, the core innovation of this invention, "10%-60% contact area ratio", is not a simple parameter adjustment, but rather achieves a balance of multiple performances that cannot be achieved by existing technologies through precise coordination with the size and density of the main flower point 11 and the composite point 21. It also has high process stability, wide adaptability, and significant industrial application value.

[0052] See appendix Figure 4 and 5 As shown, in this embodiment, the composite points 21 on the surface of the composite roller 2 can be arranged in two ways: spaced out or randomly. For ease of understanding, the following will provide further explanation in conjunction with the specific structure and principle.

[0053] In this embodiment, Method 1: The spacing arrangement uses "layered array unit A0" as the basic arrangement unit. Specifically, several layered array units A0 are distributed on the surface of the composite roller 2. Each layered array unit A0 is composed of several layers of nested sub-units A1. Each layer of sub-units A1 is distributed at intervals along the unit radial direction or a preset trajectory, and the interval distance is consistent with the adjacent gap L2 of the composite point (0.04-0.15mm) to ensure uniform pressure transmission. The shape of the sub-units A1 can be flexibly selected, that is: each layer of sub-units A1 can be set coaxially or non-axially; the shape of each layer of sub-units A1 is a ring, triangle, ellipse or other closed contour (see Appendix). Figures 9-11The different closing contours are shown in the layered array unit A0). Secondly, the contour size of each layer subunit A1 is sequentially increased along the radial direction of the layered array unit A0, and the number of complex points of the inner layer subunit A1 is less than that of the outer layer subunit. Because the outer layer subunit A1 has a longer contour circumference, increasing the number of complex points can maintain uniform density and avoid sparse complex points in the outer layer area. Thus, through the design of “layered pattern + layered subunit A1”, the uniformity of pressure transmission is further optimized without changing the core parameters such as the size of the complex point 21 surface, the total density, and the area ratio. The local stress during the pressing of the complex point 21 and the main flower point 11 is optimized and improved. The staggered arrangement of the layered subunit A1 can avoid the concentration of the complex point 21 to form a hard area, effectively disperse the pressing stress, improve the contact adaptability of the complex point 21 and the main flower point 11, and prolong the service life.

[0054] Further, the relative position relationship between the two adjacent layered array units A0 is any one of tangential, partially overlapping, or spaced arrangement. For ease of explanation and description, the three position relationships of tangential, partially overlapping, or spaced arrangement are explained and described with reference to the circular ring-shaped subunit A1. Figures 6-8 Further, the relative position relationship between the two adjacent layered array units A0 is any one of tangential, partially overlapping, or spaced arrangement. For ease of explanation and description, the three position relationships of tangential, partially overlapping, or spaced arrangement are explained and described with reference to the circular ring-shaped subunit A1. Figures 4-8 Different complex points in different areas are expressed in different ways, but the actual complex web roller surface is strictly in accordance with the above-mentioned parameter characteristics.

[0055] Referring to FIG. 4, the three position relationships of tangential, partially overlapping, or spaced arrangement are explained and described with reference to the circular ring-shaped subunit A1. Figure 6 As shown in FIG. 4, the position relationship one-tangential arrangement: the circumferential edges of the two adjacent layered array units A0 just contact, and the distance between the complex points (i.e., the complex points of the outermost subunit A1) at the edges of the two layered array units A0 is consistent with the adjacent gap of the internal complex points. In addition, the skilled person in the art can also use the derived way, that is, the outermost subunits A1 between the two layered array units A0 share several complex points 21 at the tangential position.

[0056] Referring to FIG. 4, the three position relationships of tangential, partially overlapping, or spaced arrangement are explained and described with reference to the circular ring-shaped subunit A1. Figure 7 As shown in FIG. 4, the position relationship two-partially overlapping arrangement: the circumferential edges of the two adjacent layered array units A0 intersect, and part of the area overlaps to form an overlapping area S0 (preferably, the overlapping area is ≤30% of the area of a single layered array unit A0), and each complex point 21 in the overlapping area S0 still maintains the core parameters such as the size, the total density, and the area ratio.

[0057] Referring to FIG. 4, the three position relationships of tangential, partially overlapping, or spaced arrangement are explained and described with reference to the circular ring-shaped subunit A1. Figure 8 As shown in FIG. 4, the position relationship three-spaced arrangement: the circumferential edges of the two adjacent layered array units A0 do not contact and have a certain spacing.

[0058] In summary, the area D2 of all the composite points in the three arrangement modes is always 0.01-0.05 mm2, the distance between any two adjacent composite points is ≥0.08 mm and ≤0.15 mm, and the core parameter requirement is not deviated.

[0059] In the embodiment, the remaining area S1 of the surface of the composite screen roller 2 except the layered array unit A0 coverage area is fully covered with a plurality of composite points 21, the parameter characteristics of the composite points in the area S1 are consistent with those of the composite points 21 in the layered array unit A0, and finally the surface of the composite screen roller 2 is fully covered with the composite points 21, avoiding the occurrence of a blank area.

[0060] In the embodiment, the second mode: the core "random fluctuation of parameters" in the disorderly distributed arrangement, specifically, the composite points 21 are randomly distributed on the surface of the composite screen roller 2 without fixed unit boundaries and without rules, and the area of each composite point 21, the adjacent gap, and the embossing height are independently randomly fluctuated within the corresponding rated range, which can be large or small, without the need for unified parameters or concentration in a specific sub-interval, wherein the random fluctuation of a single composite point does not affect the overall parameter to meet the standard-the overall area ratio of the composite points is still 10%-60%, and the area ratio of the compression area of the single main flower point and the composite point is still 10%-60%, and the technical effect equivalent to the interval arrangement is achieved through "local randomness and overall controllability".

[0061] The above-described embodiments are only the preferred embodiments of the present application, and do not limit the present application in any form. Any skilled person in the art can make more possible changes and decorations to the technical solution of the present application by using the disclosed technical content without departing from the scope of the technical solution of the present application, or make modifications, which are all equivalent embodiments of the present application. Therefore, any equivalent changes made according to the idea of the present application without departing from the content of the technical solution of the present application shall be covered within the protection scope of the present application.

Claims

1. A composite dot arrangement structure for a composite wire roller, applied to a composite wire roller (2) for multi-layer base paper embossing, characterized in that: The surface of the composite roller (2) is provided with a number of composite points (21), wherein the surface size D2 of each composite point (21) is 0.01-0.05mm², and the area ratio of all composite points (21) on the surface of the composite roller (2) is 10%-60%; the composite points (21) are arranged in an intermittent manner, with "layered array unit (A0)" as the basic arrangement unit, and several layers of the layered array unit (A0) are arranged in an intermittently distributed manner on the surface of the composite roller (2); a single layered array unit (A0) is composed of several layers of nested sub-units (A1), and each layer of sub-units (A1) is distributed intermittently along the radial direction of the layered array unit (A0), and each layer of sub-units (A1) is formed by several composite points (21) arranged along the contour trajectory of the sub-unit (A1).

2. The composite point arrangement structure of a composite mesh roller according to claim 1, characterized in that: The relative positional relationship between two adjacent layered array units (A0) is any one of tangent, partially overlapping, or spaced arrangement.

3. The composite point arrangement structure of a composite mesh roller according to claim 2, characterized in that: When two adjacent hierarchical array units (A0) partially overlap, the area of ​​the overlapping region is ≤ 30% of the area of ​​a single hierarchical array unit (A0).

4. The composite point arrangement structure of a composite mesh roller according to claim 1, characterized in that: The sub-units (A1) in each layer can be arranged coaxially or on different axes; the shape of each sub-unit (A1) is any closed contour among annulus, triangle, and ellipse.

5. The composite point arrangement structure of a composite mesh roller according to claim 4, characterized in that: The outline dimensions of each sub-unit (A1) increase sequentially along the radial direction of the layered array unit (A0), and the number of composite points (21) of the outer sub-unit (A1) is greater than that of the inner sub-unit (A1).

6. The composite point arrangement structure of a composite mesh roller according to claim 1, characterized in that: The surface of the composite roller (2) is covered with several composite points (21) in all areas except the area covered by the layered array unit (A0).

7. A composite dot arrangement structure for a composite wire roller, applied to a composite wire roller (2) for multi-layer base paper embossing, characterized in that: The surface of the composite roller (2) is provided with a number of composite points (21), wherein the surface size D2 of each composite point (21) is 0.01-0.05mm², and the area ratio of all composite points (21) on the surface of the composite roller (2) is 10%-60%; the arrangement of the composite points (21) is random, and the composite points (21) have no fixed unit boundaries and are randomly distributed on the surface of the composite roller (2), and the surface size, adjacent gap and embossing height of each composite point (21) fluctuate independently and randomly within the preset parameter range.

8. The composite point arrangement structure of a composite mesh roller according to claim 7, characterized in that: When the random arrangement is adopted, the surface size of the composite point (21) fluctuates within the range of 0.01-0.05 mm², and the adjacent gap fluctuates within the range of 0.04-0.15 mm.

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