Papermaking felt for ultra-wide paper machine

Abstract

The utility model provides a papermaking felt for an ultra-wide paper machine, which comprises a first surface layer fiber, two layers of second surface layer fibers, a middle layer fiber, a plied yarn bottom net, two layers of pure monofilament bottom nets and a reverse side fiber, the first surface layer fiber is positioned above the two layers of second surface layer fibers, and the middle layer fiber is positioned below the two layers of second surface layer fibers; the plied yarn bottom net is located below the middle-layer fiber, and the two layers of pure monofilament bottom nets are located below the plied yarn bottom net; the reverse side fiber is positioned below the two layers of pure monofilament bottom nets; the first surface layer fiber, the two layers of second surface layer fibers, the middle layer fiber, the plied yarn bottom net, the two layers of pure monofilament bottom nets and the reverse side fiber are connected. The papermaking felt for the ultra-wide paper machine provided by the embodiment of the utility model has good cohesion and dehydration channels, is strong in openness and not easy to block, and ensures the service life of the papermaking felt.

Description

Technical Field

[0001] The utility model relates to the technical field of papermaking felts, in particular to a papermaking felt used for an ultra-wide paper machine. Background Art

[0002] Papermaking felts are technical textiles used in the press area of ​​papermaking machines, responsible for press dehydration, paper transfer and paper surface finishing. In order to increase production and efficiency, the papermaking industry is currently developing rapidly towards high width, high speed and high line pressure.

[0003] At present, traditional papermaking felts generally include multiple layers of fibers and a bottom mesh. The bottom mesh is usually made of synthetic fibers. Due to the high width, which is often accompanied by high speed and high line pressure, this undoubtedly increases the dehydration pressure of the papermaking felt, making the papermaking felt prone to clogging, thus affecting the service life of the papermaking felt. Utility Model Content

[0004] The utility model aims to solve one of the technical problems in the above-mentioned technology at least to a certain extent.

[0005] To this end, one purpose of the utility model is to provide a papermaking felt for an ultra-wide paper machine, which has good adhesion and dewatering channels, strong openness, and is not easy to be blocked, thereby ensuring the service life of the papermaking felt.

[0006] To achieve the above-mentioned purpose, the first aspect of the utility model proposes a papermaking blanket for an ultra-wide paper machine, comprising: a first surface fiber, two layers of second surface fibers, a middle layer fiber, a twisted silk bottom mesh, two layers of pure monofilament bottom mesh and back fibers, wherein the first surface fiber is located above the two layers of the second surface fiber, and the middle layer fiber is located below the two layers of the second surface fiber; the twisted silk bottom mesh is located below the middle layer fiber, and the two layers of the pure monofilament bottom mesh are located below the twisted silk bottom mesh; the back fibers are located below the two layers of the pure monofilament bottom mesh; the first surface fiber, the two layers of the second surface fiber, the middle layer fiber, the twisted silk bottom mesh, the two layers of the pure monofilament bottom mesh and the back fibers are connected.

[0007] In addition, the papermaking felt for an ultra-wide paper machine according to the utility model may also have the following additional technical features:

[0008] Specifically, the twisted yarn base mesh is nylon 6, 3 / 1 broken twill structure, and has a gram weight of 270gsm.

[0009] Specifically, the pure monofilament base mesh is nylon 6, 1 / 1 plain weave structure, and has a grammage of 280 gsm.

[0010] Specifically, the first surface fiber is nylon 66, with a linear density of 24-33dtex and a gram weight of 140-160gsm; the second surface fiber and the back fiber are nylon 66, respectively, with a linear density of 40-60dtex and a gram weight of 160-180gsm; the middle layer fiber is nylon 66, with a linear density of 100dtex and a gram weight of 200gsm.

[0011] Compared with the prior art, the utility model has the following beneficial effects: the papermaking felt used for an ultra-wide paper machine of the utility model, through the combined design of a twisted wire bottom net and a pure monofilament bottom net, not only ensures that the felt has good adhesion, but also has a good dehydration channel. The whole blanket uses more coarse denier fibers, which makes the green blanket relatively air permeable, more open, and not easy to be blocked, providing a strong guarantee for the service life of the blanket.

[0012] Additional aspects and advantages of the present invention will be given in part in the following description and in part will become apparent from the following description or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0014] Figure 1 The figure is a schematic diagram of the structure of a papermaking felt for an ultra-wide paper machine according to an embodiment of the utility model.

[0015] Reference numerals: 10, first surface layer fibers; 11, second surface layer fibers; 12, middle layer fibers; 13, twisted yarn bottom net; 14, pure monofilament bottom net; 15, back side fibers. DETAILED DESCRIPTION

[0016] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0017] The following describes a papermaking felt for an ultra-wide paper machine according to an embodiment of the present invention with reference to the accompanying drawings.

[0018] like Figure 1 As shown, the papermaking felt for an ultra-wide paper machine according to an embodiment of the utility model may include: a first surface layer fiber 10, two layers of second surface layer fibers 11, a middle layer fiber 12, a twisted wire bottom mesh 13, two layers of pure monofilament bottom mesh 14 and back fibers 15.

[0019] Among them, the first surface fiber 10 is located above the two layers of second surface fiber 11, the middle layer fiber 12 is located below the two layers of second surface fiber 11, the plywood bottom mesh 13 is located below the middle layer fiber 12, the two layers of pure monofilament bottom mesh 14 are located below the plywood bottom mesh 13, and the back fiber 15 is located below the two layers of pure monofilament bottom mesh 14. The first surface fiber 10, the two layers of second surface fiber 11, the middle layer fiber 12, the plywood bottom mesh 13, the two layers of pure monofilament bottom mesh 14 and the back fiber 15 are connected.

[0020] It should be noted that the first surface fiber 10, two layers of second surface fiber 11, middle layer fiber 12, twisted yarn bottom mesh 13, two layers of pure monofilament bottom mesh 14 and back fiber 15 described in this embodiment are connected together through a needle punching process.

[0021] Specifically, in the process of producing papermaking felts for ultra-wide paper machines, the twisted yarn bottom net 13 and the pure monofilament bottom net 14 are first overlapped, and then the two are shaped by the following method: the two are placed on a workbench of an external shaping device, the temperature of the workbench is less than 80°C, and the temperature is gradually increased to 165°C, and then shaped from fast to slow, for a total of 4 rounds. After shaping, the temperature is lowered to below 80°C, and the twisted yarn bottom net 13 and the pure monofilament bottom net 14 are removed.

[0022] The combined design of the twisted yarn bottom net 13 and the pure monofilament bottom net 14 ensures that the blanket has good adhesion and good dehydration channels. The whole blanket uses more coarse denier fibers, which makes the green blanket relatively air-permeable, open and not easy to be blocked, thus providing a strong guarantee for the service life of the blanket.

[0023] Afterwards, the middle layer fibers 12, two layers of second surface layer fibers 11 and the first surface layer fibers 10 are laid on the twisted silk bottom mesh 13, and the back fibers 15 are laid on two layers of pure monofilament bottom mesh 14. The various parts are connected together through a needling process. The front and back sides are needled simultaneously, which effectively improves the bonding strength between the layers of fibers and further ensures the wear resistance of the blanket.

[0024] The papermaking felt is then heat-set by applying water and pressure to hot rollers on both sides. The roller surface temperature is about 120°C during water spraying and pressure application, and about 180°C during setting.

[0025] The blanket is shaped by spraying water on both sides to increase pressure. The air permeability of the finished blanket is relatively low, which solves the problem of the long initial adaptation period of the blanket. By designing the blanket to be tight outside and loose inside, the contradiction between initial adaptability and service life is solved. The bottom net is shaped by four circles of temperature rise and fall, from fast to slow, to ensure the stability of the bottom net, lay the foundation for the stability of the blanket, ensure the dimensional stability of the blanket, and enable the blanket to operate stably under long-term fatigue use.

[0026] In one embodiment of the present invention, Figure 1 As shown, the twisted silk base mesh 13 is nylon 6, 3 / 1 broken twill structure (warp yarn 0.2*4, weft yarn 0.4*1, warp density 96, weft density 80), and the gram weight is 270gsm (gsm is the international paper weight unit, meaning grams per square meter, the full name is Gramme / Square Meter).

[0027] It should be noted that the plied yarn base mesh 13 described in this embodiment adopts a 3 / 1 broken twill structure. The 3 / 1 broken twill structure is composed of left and right twills, and the warp and weft lines adopt a three-up-one-down interlaced structure to form a broken and discontinuous twill line structure at the junction.

[0028] It should be noted that the main type of nylon is aliphatic polyamide fiber, which can be synthesized from one monomer, such as lactam or amino acid. The Arabic numerals after the nylon name indicate the number of carbon atoms in the lactam or amino acid used, such as nylon 6, nylon 11 and nylon 66.

[0029] In one embodiment of the present invention, Figure 1 As shown, the pure monofilament bottom mesh 14 is nylon 6, 1 / 1 plain weave structure (warp yarn 0.4*1, weft yarn 0.4*1, warp density 80, weft density 80), and the gram weight is 280gsm.

[0030] It should be noted that the pure monofilament base mesh 14 described in this embodiment adopts a 1 / 1 plain weave structure, wherein the 1 / 1 plain weave structure is a basic structure in which the warp and weft points alternate in a 1:1 ratio, and the structure formed by the warp yarns and weft yarns interlaced one above and one below is called a plain weave.

[0031] In one embodiment of the present invention, Figure 1 As shown, the first surface fiber 10 is nylon 66, with a linear density of 24-33dtex (dtex is the symbol of decitex, which is abbreviated as decitex, and the full name is decitex, which refers to the weight of 10,000 meters of fiber or yarn at a specified moisture regain), and a gram weight of 140-160gsm. The second surface fiber 11 and the back fiber 15 are nylon 66, respectively, with a linear density of 40-60dtex and a gram weight of 160-180gsm. The middle layer fiber 12 is nylon 66, with a linear density of 100dtex and a gram weight of 200gsm.

[0032] It should be noted that the nylon 6 product described in this embodiment has the characteristics of small diameter, high strength, wear resistance, softness and gentle touch on the skin, and has a wide range of uses in the fields of clothing, silk, umbrellas, fishing net yarn, cord yarn, carpet yarn and engineering plastics.

[0033] Nylon is mainly filament, and a small amount of short fibers are mainly used for blending with wool, cotton or other chemical fibers to improve the strength and durability of the fabric. Some nylon filaments are used for silk, scarves, lace, etc., and most of them are processed into stretch yarn, which is used to make socks, nylon shirts, gloves, etc., which are strong and durable.

[0034] In summary, the papermaking felt used for an ultra-wide paper machine of the utility model is designed to be relatively open through the design of the bottom mesh combination and the mesh variety and ratio, thereby ensuring the service life of the felt; the air permeability of the finished felt is reduced by spraying water and pressurizing the front and back sides respectively, thereby improving the initial adaptability of the felt; the mesh is fixed by heating and cooling and from fast to slow, thereby completely stabilizing the plywood bottom mesh and the two-layer pure monofilament bottom mesh, thereby making the felt dimensionally stable during long-term operation.

[0035] In the description of this specification, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0036] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0037] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in this field can change, modify, replace and deform the above embodiments within the scope of the present invention.

Claims

1. A papermaking felt for an ultra-wide paper machine, characterized in that: include: A first surface layer fiber (10), two layers of second surface layer fibers (11), a middle layer fiber (12), a twisted silk bottom net (13), two layers of pure monofilament bottom net (14) and a back surface fiber (15), wherein: The first surface layer fibers (10) are located above the two layers of the second surface layer fibers (11), and the middle layer fibers (12) are located below the two layers of the second surface layer fibers (11); The plied yarn bottom net (13) is located below the middle layer fiber (12), and the two layers of pure monofilament bottom nets (14) are located below the plied yarn bottom net (13); The reverse fiber (15) is located below the two layers of pure monofilament bottom mesh (14); The first surface fiber (10), two layers of the second surface fiber (11), the middle layer fiber (12), the twisted yarn bottom net (13), two layers of the pure monofilament bottom net (14) and the back fiber (15) are connected.

2. The papermaking felt for an ultra-wide paper machine according to claim 1, characterized in that: The twisted yarn bottom net (13) is nylon 6, 3 / 1 broken twill structure, and has a gram weight of 270gsm.

3. The papermaking felt for an ultra-wide paper machine according to claim 1, characterized in that: The pure monofilament bottom net (14) is nylon 6, 1 / 1 plain weave structure, and has a grammage of 280gsm.

4. The papermaking felt for an ultra-wide paper machine according to claim 1, characterized in that: The first surface layer fiber (10) is nylon 66, with a linear density of 24-33 dtex and a gram weight of 140-160 gsm; The second surface fiber (11) and the back fiber (15) are respectively nylon 66, with a linear density of 40-60 dtex and a gram weight of 160-180 gsm; The middle layer fiber (12) is nylon 66, with a linear density of 100 dtex and a gram weight of 200 gsm.

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