CN111945292A - High-elasticity non-woven material for drying roll and preparation method thereof - Google Patents

High-elasticity non-woven material for drying roll and preparation method thereof Download PDF

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Publication number
CN111945292A
CN111945292A CN202010730323.1A CN202010730323A CN111945292A CN 111945292 A CN111945292 A CN 111945292A CN 202010730323 A CN202010730323 A CN 202010730323A CN 111945292 A CN111945292 A CN 111945292A
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ptt
fiber
needling
fibers
surface layer
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CN111945292B (en
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张得昆
张志贵
李艳
赖艳
张星
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Baoji Jiaxin Filter Technology Co ltd
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Xian Polytechnic University
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    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/44—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling
    • D04H1/46—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres
    • D04H1/498—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres entanglement of layered webs
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
    • D04H1/4326—Condensation or reaction polymers
    • D04H1/435—Polyesters
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
    • D04H1/4382—Stretched reticular film fibres; Composite fibres; Mixed fibres; Ultrafine fibres; Fibres for artificial leather
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/44—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling
    • D04H1/46—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres
    • D04H1/48—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres in combination with at least one other method of consolidation
    • D04H1/485—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres in combination with at least one other method of consolidation in combination with weld-bonding

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Nonwoven Fabrics (AREA)

Abstract

The invention discloses a high-elasticity non-woven material for a drying roll, which comprises an upper surface layer, a middle layer and a lower surface layer, wherein the upper surface layer and the lower surface layer are composed of the following raw material components in percentage by mass: 70-90% of PTT fiber, 10-30% of ES fiber, and the sum of the two raw materials is 100%; the middle layer is 100% of PTT fiber; the invention also discloses a preparation method of the high-elasticity non-woven material for the drying roller, which comprises the steps that the upper surface layer and the lower surface layer are PTT/ES fiber needled felts prepared by opening, carding, lapping and pre-needling, and the middle layer is a PTT fiber needled felt prepared by opening, carding, lapping and pre-needling; and then the upper surface layer, the middle layer and the lower surface layer are laid into a sandwich structure for needle punching compounding, and then hot rolling treatment is carried out. The nonwoven material for the wringing roller made of the nonwoven material not only has good elasticity, but also has good liquid absorption performance and strength, and can meet various performance requirements of the nonwoven wringing roller.

Description

High-elasticity non-woven material for drying roll and preparation method thereof
Technical Field
The invention belongs to the technical field of non-woven product processing, relates to a high-elasticity non-woven material for a drying roll, and further relates to a preparation method of the high-elasticity non-woven material for the drying roll.
Background
Non-woven fabrics, also known as non-woven materials, are a new type of processing technology different from traditional textiles, and are generally formed by the following processes: the textile short fiber or filament is firstly oriented or randomly arranged to form a fiber web structure, and then is reinforced by adopting a mechanical, thermal bonding or chemical bonding method. The non-woven fabric produced by the non-woven technology has the advantages of short production flow, low production cost and the like.
The squeezing roller is a main tool for squeezing liquid on the surface of a strip or uniformly coating the surface of the strip, most domestic squeezing rollers at present are rubber squeezing rollers or metal squeezing rollers, and the squeezing is realized by rigidly squeezing the liquid by tightly combining a rubber body and the strip, so that the defects of poor squeezing effect, short service life, easy cutting and cracking, low friction coefficient and the like exist. The non-woven fabric drying roller consists of a high-strength non-woven fabric and a metal mandrel, and the drying principle is as follows: when the board is just contacted with the roller, the liquid is absorbed and the dam effect is realized due to the porosity and the compressibility of the non-woven fabric roller; when the plate runs to the center of the roller gap, the non-woven fabric gap on the roller is highly compressed, liquid in the non-woven fabric is squeezed out, and meanwhile, the roller generates a sealing effect; when the plate leaves the roller, the compression action is reduced, the roller gap is opened, and the residual liquid on the surface of the plate is absorbed; the process is continuously carried out along with the rotation of the roller, so that the residual liquid on the surface of the strip material is squeezed. In the whole squeezing or oiling process, the elastic force is high in requirement, when the elastic force is good, the squeezing roller can have good squeezing or even oiling effect by applying small pressure, the damage to the non-woven fabric roller and the plate is small, and the service life of the non-woven fabric roller and the surface quality of the plate are favorably improved. Therefore, the development of the high-elasticity non-woven fabric drying roller has good market potential and academic significance.
Disclosure of Invention
The invention aims to provide a high-elasticity non-woven material for a wringing roller, which has the characteristics of good elasticity and liquid absorption.
The invention also aims to provide a preparation method of the high-elasticity non-woven material for the drying roll.
The technical scheme adopted by the invention is that the high-elasticity non-woven material for the drying roll comprises an upper surface layer, a middle layer and a lower surface layer, wherein the upper surface layer and the lower surface layer are the same in raw material components and are composed of the following raw material components in percentage by mass: 70-90% of PTT fiber, 10-30% of ES fiber, and the sum of the two raw materials is 100%; the middle layer is 100% of PTT fiber.
The invention is also characterized in that:
the PTT fiber has the linear density of 1-4 dtex and the length of 45-70 mm, and the ES fiber has the linear density of 1.5-3dtex and the length of 38-65 mm.
The invention adopts another technical scheme that the preparation method of the high-elasticity non-woven material for the drying roll is implemented according to the following steps:
step 1, weighing the following raw materials in percentage by mass:
the upper and lower skin layers are: 70-90% of PTT fiber, 10-30% of ES fiber, and the sum of the two raw materials is 100%;
an intermediate layer: 100% of PTT fiber;
step 2, mixing the PTT fibers and the ES fibers of the upper surface layer and the PTT fibers and the ES fibers of the lower surface layer weighed in the step 1 respectively to form mixed fibers;
step 3, opening and mixing the mixed fiber obtained in the step 2 by using an opener to obtain pretreated mixed fiber;
step 4, opening and mixing the PTT fibers of the middle layer weighed in the step 1 by using an opener to obtain pretreated fibers;
step 5, carding the pretreated mixed fibers and the pretreated fibers obtained in the step 3 and the step 4 by adopting a carding machine respectively, and outputting a fiber web from the carding machine;
step 6, respectively carrying out crossed lapping or air-laid on the fiber net obtained in the step 5;
step 7, respectively carrying out pre-needling reinforcement on the fiber web formed by the crossed lapping or air-laying in the step 6 to form a PTT/ES fiber needled felt and a PTT fiber needled felt;
step 8, laying the PTT/ES fiber needled felt and the PTT fiber needled felt obtained in the step 7 into an upper layer, a middle layer and a lower layer, wherein the PTT/ES fiber needled felt, the PTT fiber needled felt and the PTT/ES fiber needled felt are sequentially subjected to needling compounding to form a needled composite felt;
and 9, carrying out hot rolling on the needled composite felt obtained in the step 8 to obtain the high-elasticity non-woven material for the drying roll.
The other technical scheme of the invention is also characterized in that:
in the step 1, the linear density of the PTT fibers is 1-4 dtex, the length of the PTT fibers is 45-70 mm, the linear density of the ES fibers is 1.5-3dtex, and the length of the ES fibers is 38-65 mm.
The needling depth of the pre-needling reinforcement in the step 7 is 7 mm-9 mm, and the needling density is 40 needling/cm2About 60 spines/cm2。
In the pre-needling of the mixed fiber PTT/ES in the step 7, the gram weight of the needled felt is 70g/m2～90g/m2。
In the pre-needling of the PTT fiber in the step 7, the gram weight of the needled felt is 150g/m2～170g/m2。
In the needling composition in the step 8, the needling depth is 7 mm-9 mm, and the needling density is 80 needling/cm2150 thorn/cm2。
In the step 9, the hot rolling temperature is 140-170 ℃, the roll spacing is 0.5-1.5 mm, and the roll speed is 0.56-2.8 m/min.
The invention has the beneficial effects that:
(1) the non-woven material for the wringing roller prepared by the processing method has higher elasticity, and when the wringing roller prepared by the processing method is used for liquid wringing or uniform oiling on the surface of a strip, the wringing roller can be in close contact with the surface of the strip by applying smaller pressure on the surface of the strip, so that the wringing effect or the uniformity of oiling can be improved, the processing quality of the strip can be effectively improved, and the energy consumption required by drying the strip can be reduced.
(2) The nonwoven material for the wringing roller prepared by the processing method has higher elasticity, the wringing roller prepared by the processing method can be closely contacted with the surface of the strip without applying large pressure to the surface of the strip, the effect of good wringing or uniform oiling of the plate is achieved, the pressure of the wringing roller and the strip is low, the nonwoven material is not easy to damage, the service life of the nonwoven roller can be effectively prolonged, and the production cost of strip enterprises is reduced.
Drawings
FIG. 1 is a flow chart of a method of making a highly elastic nonwoven material for a wringer roller of the present invention;
fig. 2 is a schematic structural diagram of the high-elasticity nonwoven material for the wringing roller prepared by the method of the invention.
Detailed Description
The present invention will be described in detail with reference to the following embodiments.
The high-elasticity non-woven material for the drying roll comprises an upper surface layer, a middle layer and a lower surface layer, wherein the upper surface layer and the lower surface layer are the same in raw material components and are composed of the following raw material components in percentage by mass: 70-90% of PTT fiber, 10-30% of ES fiber, and the sum of the two raw materials is 100%; the middle layer is made of 100% of PTT fibers, the linear density of the PTT fibers is 1-4 dtex, the length of the PTT fibers is 45-70 mm, the linear density of the ES fibers is 1.5-3dtex, and the length of the ES fibers is 38-65 mm.
The invention relates to a preparation method of a high-elasticity non-woven material for a drying roll, which is implemented according to the following steps:
step 1, weighing the following raw materials in percentage by mass:
the upper and lower skin layers are: 70-90% of PTT fiber, 10-30% of ES fiber, and the sum of the two raw materials is 100%;
an intermediate layer: 100% of PTT fiber;
the PTT fiber has the linear density of 1-4 dtex and the length of 45-70 mm, and the ES fiber has the linear density of 1.5-3dtex and the length of 38-65 mm;
the purpose of this step is set up to: the PTT fiber mainly provides good elasticity for the product of the invention, and the ES fiber mainly plays a role in thermal bonding, so that the product of the invention has good strength, and simultaneously, the elasticity of the PTT fiber is fully exerted;
step 2, mixing the PTT fibers and the ES fibers of the upper surface layer and the lower surface layer weighed in the step 1 respectively to form mixed fibers;
step 3, opening and mixing the mixed fiber obtained in the step 2 by using an opener to obtain pretreated mixed fiber;
opening is mainly performed by a wool mixer (opener), such as: type B261 fearnaught;
step 4, carding the pretreated mixed fibers obtained in the step 3 by using a carding machine, and outputting a fiber web from the carding machine;
the purpose of this step is set up to: further opening and fully carding the opened fibers;
step 5, performing crossed lapping or air-laid on the fiber net obtained in the step 4;
the purpose of this step is set up to: the fiber web reaches the required square meter gram weight, and the fibers in the fiber web are uniformly distributed in all directions;
step 6, carrying out pre-needling reinforcement on the fiber web formed in the step 5 to form a PTT/ES needled felt;
the technological parameters to be controlled in the pre-needling reinforcing process are as follows: the needling depth and the needling density are adopted, and the fibers in the fiber web are mutually entangled together through needling, so that the fiber web is in a three-dimensional structure;
in this step: the needling depth is 7 mm-9 mm, and the needling density is 40 needling/cm2About 60 spines/cm2The gram weight of the PTT/ES needled felt is 70g/m2～90g/m2；
Step 7, opening and mixing the PTT fibers of the middle layer by using an opener to obtain pretreated fibers;
step 8, carding the pretreated fibers obtained in the step 7 by using a carding machine, and outputting a fiber web from the carding machine;
step 9, performing crossed lapping or air-laying on the fiber net obtained in the step 8;
step 10, carrying out pre-needling reinforcement on the fiber web formed in the step 9 to form a PTT needled felt;
in this step: the needling depth is 7 mm-9 mm, and the needling density is 40 needling/cm2About 60 spines/cm2The gram weight of the PTT needled felt is 150g/m2～170g/m2。
Step 11, laying and overlapping the surface layer PTT/ES needled felt obtained in the step 6 and the middle layer PTT needled felt obtained in the step 10 into a sandwich structure, wherein the middle layer is the PTT needled felt, the upper surface layer and the lower surface layer are the PTT/ES needled felt, and carrying out needling compounding to form a three-layer structure needled composite felt;
in the needling composite process, the needling depth is 7 mm-9 mm, and the needling density is 80 punches/cm2150 thorn/cm2；
The purpose of this step is to: the fiber net with the sandwich structure is needled and reinforced to form a needled composite felt, and the structure of the middle layer is different from that of the upper and lower surface layers, so that the needled composite felt shows special performance;
step 12, carrying out hot rolling on the three-layer structure needled composite felt obtained in the step 11 to obtain a high-elasticity non-woven material for a drying roll;
in the hot rolling process, the hot rolling temperature is 140-170 ℃, the roll spacing is 0.5-1.5 mm, and the roll speed is 0.56-2.8 m/min.
The purpose of this step is to: through hot rolling, ES fibers in the upper surface layer and the lower surface layer of the needled composite felt are heated to melt and are bonded with PTT fibers to form a surface layer with a compact structure, so that the strength of the needled composite felt can be effectively improved, meanwhile, two ends of PTT elastic fibers in the middle layer are bonded and fixed with the upper surface and the lower surface of the needled felt, the deformation recovery performance of the PTT elastic fibers in the middle layer can be obviously improved, meanwhile, the PTT fibers in the middle layer are relatively loose, a large number of gaps are formed in the middle layer, and the water absorption performance of the composite felt is favorably improved.
Example 1
Weighing the following raw materials in percentage by mass: upper and lower skins: 70% of PTT fiber (2dtex multiplied by 70mm), 30% of ES fiber (1.5dtex multiplied by 38 mm); an intermediate layer: PTT fiber (2dtex is multiplied by 70mm)100 percent;
mixing the opened surface PTT fibers and ES fibers to form mixed fibers;
opening and mixing the mixed fibers by using an opener to obtain pretreated mixed fibers;
carding the obtained pre-treated mixed fiber by using a roller carding machine with a fiber disordering mechanism, and outputting a fiber web from the carding machine;
carrying out crossed lapping on the fiber web output by the carding machine;
pre-needling and reinforcing the fiber net formed by cross lapping to form a PTT/ES needled felt; in the pre-needling reinforcing process, the needling depth is 7mm, and the needling density is 50 needling/cm2The gram weight of the PTT/ES needled felt is 80g/m2；
Opening and mixing the intermediate layer PTT fibers by using an opener to obtain pretreated fibers;
carding the obtained pre-treated mixed fiber by a roller carding machine with a fiber disorder mechanism, and outputting a fiber web from the carding machine;
carrying out crossed lapping on the fiber web output by the carding machine;
pre-needling and reinforcing the fiber net formed by cross lapping to form a PTT needled felt; in the pre-needling reinforcing process, the needling depth is 7mm, and the needling density is 50 needling/cm2The gram weight of the PTT needled felt is 160g/m2；
Laying PTT/ES needled felts on the surface layer and PTT needled felts in the middle layer into a sandwich structure, wherein the PTT needled felts are arranged in the middle layer, the PTT/ES needled felts are arranged on the upper surface layer and the lower surface layer, and carrying out needling compounding to form a three-layer needled composite felt; when needling is carried out in a compounding manner, the needling depth is 7mm, and the needling density is 80 needling/cm2；
Hot rolling the needled composite felt; in the hot rolling process, the hot rolling temperature is 145 ℃, the roll gauge is 0.5mm, and the roll speed is 0.56m/min, so that the high-elasticity non-woven material for the wringing roll is obtained.
Example 2
Weighing the following raw materials in percentage by mass: upper and lower skins: PTT fiber (1.5dtex multiplied by 45mm)75 percent and ES fiber (2.0dtex multiplied by 51mm)25 percent; an intermediate layer: PTT fiber (1.5dtex is multiplied by 45mm)100 percent;
mixing the opened surface PTT fibers and ES fibers to form mixed fibers;
opening and mixing the mixed fibers by using an opener to obtain pretreated mixed fibers;
carding the obtained pre-treated mixed fiber by a roller carding machine, and outputting a fiber web from the carding machine;
air-laying the fibers output by the carding machine;
pre-needling and reinforcing the fiber web formed by air-laying to form a PTT/ES needled felt; in the pre-needling reinforcing process, the needling depth is 8mm, and the needling density is 50 needling/cm2The gram weight of the PTT/ES needled felt is 90g/m2；
Opening and mixing the intermediate layer PTT fibers by using an opener to obtain pretreated fibers;
carding the obtained pre-treated mixed fiber by a roller carding machine, and outputting a fiber web from the carding machine;
air-laying the fiber web output by the carding machine;
pre-needling and reinforcing the fiber web formed by air-laying to form a PTT needled felt; in the pre-needling reinforcing process, the needling depth is 8mm, and the needling density is 50 needling/cm2The gram weight of the PTT needled felt is 160g/m2；
Spreading a surface layer PTT/ES needled felt and a middle layer PTT needled felt into a sandwich structure, wherein the middle layer is the PTT needled felt, the upper surface layer and the lower surface layer are the PTT/ES needled felt, and carrying out needling compounding to form a three-layer structure needled composite felt; when needling is carried out in a compounding manner, the needling depth is 8mm, and the needling density is 100 punches/cm2；
Hot rolling the needled composite felt; in the hot rolling process, the hot rolling temperature is 150 ℃, the roll gauge is 1mm, and the roll speed is 1m/min, so that the high-elasticity non-woven material for the drying roll is obtained.
Example 3
Weighing the following raw materials in percentage by mass: upper and lower skins: PTT fiber (3dtex multiplied by 60mm) 80%, ES fiber (2.5dtex multiplied by 38mm) 20%; an intermediate layer: PTT fiber (3dtex is multiplied by 60mm)100 percent;
mixing the opened surface PTT fibers and ES fibers to form mixed fibers;
opening and mixing the mixed fibers by using an opener to obtain pretreated mixed fibers;
carding the obtained pre-treated mixed fiber by a roller carding machine with a fiber disorder mechanism, and outputting a fiber web from the carding machine;
carrying out crossed lapping on the fiber web output by the carding machine;
pre-needling and reinforcing the fiber net formed by cross lapping to form a PTT/ES needled felt; in the pre-needling reinforcing process, the needling depth is 9mm, and the needling density is 60 punches/cm2The gram weight of the PTT/ES needled felt is 80g/m2；
Opening and mixing the intermediate layer PTT fibers by using an opener to obtain pretreated fibers;
carding the obtained pre-treated mixed fiber by a roller carding machine with a fiber disorder mechanism, and outputting a fiber web from the carding machine;
carrying out crossed lapping on the fiber web output by the carding machine;
pre-needling and reinforcing the fiber net formed by cross lapping to form a PTT needled felt; in the pre-needling reinforcing process, the needling depth is 9mm, and the needling density is 60 punches/cm2The gram weight of the PTT needled felt is 170g/m2；
The surface layer PTT/ES needled felt and the middle layer PTT needled felt are laid and stacked into a sandwich structure, the middle layer is the PTT needled felt, the upper and lower surface layers are the PTT/ES needled felt, and the needling composition is carried out to form a three-layer structure needled composite felt; when needling is carried out in a compounding manner, the needling depth is 9mm, and the needling density is 150 needling/cm2；
Hot rolling the needled composite felt; in the hot rolling process, the hot rolling temperature is 160 ℃, the roll gauge is 1.5mm, and the roll speed is 1.5m/min, so that the high-elasticity non-woven material for the drying roll is obtained.
Example 4
Weighing the following raw materials in percentage by mass: upper and lower skins: PTT fiber (2.5dtex multiplied by 51mm) 85%, ES fiber (3.0dtex multiplied by 38mm) 15%; an intermediate layer: PTT fiber (2.5dtex multiplied by 51mm)100 percent;
mixing the opened surface PTT fibers and ES fibers to form mixed fibers;
opening and mixing the mixed fibers by using an opener to obtain pretreated mixed fibers;
carding the obtained pre-treated mixed fiber by a roller carding machine with a fiber disorder mechanism, and outputting a fiber web from the carding machine;
carrying out crossed lapping on the fiber web output by the carding machine;
pre-needling and reinforcing the fiber net formed by cross lapping to form a PTT/ES needled felt; in the pre-needling reinforcing process, the needling depth is 8.5mm, and the needling density is 40 punches/cm2The gram weight of the PTT/ES needled felt is 70g/m2；
Opening and mixing the intermediate layer PTT fibers by using an opener to obtain pretreated fibers;
carding the obtained pre-treated mixed fiber by a roller carding machine with a fiber disorder mechanism, and outputting a fiber web from the carding machine;
carrying out crossed lapping on the fiber web output by the carding machine;
pre-needling and reinforcing the fiber net formed by cross lapping to form a PTT needled felt; in the pre-needling reinforcing process, the needling depth is 8.5mm, and the needling density is 40 punches/cm2The gram weight of the PTT needled felt is 170g/m2；
The surface layer PTT/ES needled felt and the middle layer PTT needled felt are laid and stacked into a sandwich structure, the middle layer is the PTT needled felt, the upper and lower surface layers are the PTT/ES needled felt, and the needling composition is carried out to form a composite needled felt with a three-layer structure; when needling is carried out in a compounding way, the needling depth is 8.5mm, and the needling density is 120 needling/cm2；
Hot rolling the needled composite felt; in the hot rolling process, the hot rolling temperature is 170 ℃, the roll gauge is 0.9mm, and the roll speed is 2m/min, so that the high-elasticity non-woven material for the drying roll is obtained.
Example 5
Weighing the following raw materials in percentage by mass: upper and lower skins: 90% of PTT fiber (2dtex multiplied by 40mm), 10% of ES fiber (1.5dtex multiplied by 60 mm); an intermediate layer: PTT fiber (2dtex is multiplied by 40mm)100 percent;
mixing the opened surface PTT fibers and ES fibers to form mixed fibers;
opening and mixing the mixed fibers by using an opener to obtain pretreated mixed fibers;
carding the obtained pre-treated mixed fiber by a roller carding machine, and outputting a fiber web from the carding machine;
air-laying the fiber web output by the carding machine;
pre-needling and reinforcing the fiber web formed by air-laying to form a PTT/ES needled felt; in the pre-needling reinforcing process, the needling depth is 7.5mm, and the needling density is 50 punches/cm2The gram weight of the PTT/ES needled felt is 80g/m2；
Opening and mixing the intermediate layer PTT fibers by using an opener to obtain pretreated fibers;
carding the obtained pre-treated mixed fiber by a roller carding machine, and outputting a fiber web from the carding machine;
air-laying the fiber web output by the carding machine;
pre-needling and reinforcing the fiber web formed by air-laying to form a PTT needled felt; in the pre-needling reinforcing process, the needling depth is 7.5mm, and the needling density is 50 punches/cm2The gram weight of the PTT needled felt is 160g/m2；
The surface layer PTT/ES needled felt and the middle layer PTT needled felt are laid and stacked into a sandwich structure, the middle layer is the PTT needled felt, the upper and lower surface layers are the PTT/ES needled felt, and the needling composition is carried out to form a composite needled felt with a three-layer structure; when needling is carried out in a compounding way, the needling depth is 7.5mm, and the needling density is 80 punches/cm2；
Hot rolling the needled composite felt; in the hot rolling process, the hot rolling temperature is 155 ℃, the roll gauge is 1.3mm, and the roll speed is 2.5m/min, so that the high-elasticity non-woven material for the wringing roll is obtained.
Example 6
Weighing the following raw materials in percentage by mass: upper and lower skins: 88% of PTT fiber (3.5dtex multiplied by 70mm), 12% of ES fiber (1.5dtex multiplied by 56 mm); an intermediate layer: PTT fiber (3.5dtex is multiplied by 70mm)100 percent;
mixing the opened surface PTT fibers and ES fibers to form mixed fibers;
opening and mixing the mixed fibers by using an opener to obtain pretreated mixed fibers;
carding the obtained pre-treated mixed fiber by a roller carding machine with a fiber disorder mechanism, and outputting a fiber web from the carding machine;
carrying out crossed lapping on the fiber web output by the carding machine;
pre-needling and reinforcing the fiber net formed by cross lapping to form a PTT/ES needled felt; in the pre-needling reinforcing process, the needling depth is 8mm, and the needling density is 60 punches/cm2The gram weight of the PTT/ES needled felt is 90g/m2；
Opening and mixing the intermediate layer PTT fibers by using an opener to obtain pretreated fibers;
carding the obtained pre-treated mixed fiber by a roller carding machine with a fiber disorder mechanism, and outputting a fiber web from the carding machine;
carrying out crossed lapping on the fiber web output by the carding machine;
pre-needling and reinforcing the fiber net formed by cross lapping to form a PTT needled felt; in the pre-needling reinforcing process, the needling depth is 8mm, and the needling density is 60 punches/cm2The gram weight of the PTT needled felt is 150g/m2；
The surface layer PTT/ES needled felt and the middle layer PTT needled felt are laid and stacked into a sandwich structure, the middle layer is the PTT needled felt, the upper and lower surface layers are the PTT/ES needled felt, and the needling composition is carried out to form a composite needled felt with a three-layer structure; when needling is carried out in a compounding manner, the needling depth is 8mm, and the needling density is 150 punches/cm2；
Hot rolling the needled composite felt; in the hot rolling process, the hot rolling temperature is 165 ℃, the roll gauge is 1.5mm, and the roll speed is 2m/min, so that the high-elasticity non-woven material for the drying roll is obtained.
The elasticity, water absorption and strength of the highly elastic nonwoven material for squeeze rolls obtained in examples 1 to 6 of the present invention are shown in table 1 as compared with the conventional material for squeeze rolls:
TABLE 1 comparison of Properties
Figure BDA0002602952490000141
It can be seen from table 1 that the high-elasticity nonwoven material for a wringing roller obtained by the method of the present invention is superior to the conventional wringing roller material in elasticity, water absorbency, and strength.
The processing method of the high-elasticity non-woven material for the drying roll provided by the invention has the advantages that PTT and ES fibers are processed by utilizing a needling non-woven technology, the performance of the non-woven fabric drying roll is obviously improved, the service life of the drying roll is effectively prolonged, and the production cost is reduced.

Claims (9)

1. The high-elasticity non-woven material for the drying roll is characterized by comprising an upper surface layer, a middle layer and a lower surface layer, wherein the upper surface layer and the lower surface layer are the same in raw material components and are composed of the following raw material components in percentage by mass: 70-90% of PTT fiber, 10-30% of ES fiber, and the sum of the two raw materials is 100%; the middle layer is 100% of PTT fiber.
2. The high-elasticity nonwoven material for the wringing roller according to claim 1, wherein the PTT fibers have a linear density of 1 to 4dtex and a length of 45 to 70mm, and the ES fibers have a linear density of 1.5 to 3dtex and a length of 38 to 65 mm.
3. The preparation method of the high-elasticity non-woven material for the drying roll is characterized by comprising the following steps of:
step 1, weighing the following raw materials in percentage by mass:
the upper and lower skin layers are: 70-90% of PTT fiber, 10-30% of ES fiber, and the sum of the two raw materials is 100%;
an intermediate layer: 100% of PTT fiber;
step 2, mixing the PTT fibers and the ES fibers of the upper surface layer and the PTT fibers and the ES fibers of the lower surface layer weighed in the step 1 respectively to form mixed fibers;
step 3, opening and mixing the mixed fiber obtained in the step 2 by using an opener to obtain pretreated mixed fiber;
step 4, opening and mixing the PTT fibers of the middle layer weighed in the step 1 by using an opener to obtain pretreated fibers;
step 5, carding the pretreated mixed fibers and the pretreated fibers obtained in the step 3 and the step 4 by adopting a carding machine respectively, and outputting a fiber web from the carding machine;
step 6, respectively carrying out crossed lapping or air-laid on the fiber net obtained in the step 5;
step 7, respectively carrying out pre-needling reinforcement on the fiber web formed by the crossed lapping or air-laying in the step 6 to form a PTT/ES fiber needled felt and a PTT fiber needled felt;
step 8, laying the PTT/ES fiber needled felt and the PTT fiber needled felt obtained in the step 7 into an upper layer, a middle layer and a lower layer, wherein the PTT/ES fiber needled felt, the PTT fiber needled felt and the PTT/ES fiber needled felt are sequentially subjected to needling compounding to form a needled composite felt;
and 9, carrying out hot rolling on the needled composite felt obtained in the step 8 to obtain the high-elasticity non-woven material for the drying roll.
4. The method for preparing the high-elasticity non-woven material for the drying roll according to claim 3, wherein the PTT fibers in the step 1 have the linear density of 1-4 dtex and the length of 45-70 mm, and the ES fibers have the linear density of 1.5-3dtex and the length of 38-65 mm.
5. According to claim 3The preparation method of the high-elasticity non-woven material for the drying roll is characterized in that the needling depth of the pre-needling reinforcement in the step 7 is 7-9 mm, and the needling density is 40 punches/cm2About 60 spines/cm2。
6. The method for preparing the high-elasticity non-woven material for the wringing roller according to claim 3, wherein in the pre-needling of the mixed fiber PTT/ES in the step 7, the gram weight of the needled felt is 70g/m2～90g/m2。
7. The method for preparing the high-elasticity non-woven material for the wringing roller according to claim 3, wherein in the pre-needling of the fiber PTT in the step 7, the gram weight of the needled felt is 150g/m2～170g/m2。
8. The method for preparing the high-elasticity non-woven material for the wringing roller according to claim 3, wherein in the needling composition in the step 8, the needling depth is 7mm to 9mm, and the needling density is 80 punches/cm2150 thorn/cm2。
9. The method for preparing the high-elasticity non-woven material for the wringing roller according to claim 3, wherein the hot rolling temperature in the step 9 is 140-170 ℃, the roll gauge is 0.5-1.5 mm, and the roll speed is 0.56-2.8 m/min.
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