CN112853608B - Environment-friendly heat-preservation jute non-woven fabric packaging material and preparation method thereof - Google Patents
Environment-friendly heat-preservation jute non-woven fabric packaging material and preparation method thereof Download PDFInfo
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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
- D04H1/48—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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/12—Layered products comprising a layer of synthetic resin next to a fibrous or filamentary layer
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/40—Layered products comprising a layer of synthetic resin comprising polyurethanes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/06—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the heating method
- B32B37/065—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the heating method resulting in the laminate being partially bonded
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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
- D04H1/42—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
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- D—TEXTILES; PAPER
- D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B2505/00—Industrial
- D10B2505/10—Packaging, e.g. bags
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W90/00—Enabling technologies or technologies with a potential or indirect contribution to greenhouse gas [GHG] emissions mitigation
- Y02W90/10—Bio-packaging, e.g. packing containers made from renewable resources or bio-plastics
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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Mechanical Engineering (AREA)
- Nonwoven Fabrics (AREA)
Abstract
The invention relates to an environment-friendly heat-preservation jute non-woven fabric packaging material and a preparation method thereof, wherein jute short fibers and skin-core polyurethane short fibers are used as main raw materials to be made into a needle-punched fiber net, and the needle-punched fiber net is bonded by hot air to form a hot air bonding fiber net; then compounding the hot air bonding fiber net and the polyurethane film, and hot rolling the compound by two pairs of compression rollers in sequence to prepare a packaging material of the heat-insulating jute non-woven fabric; when two pairs of compression rollers are subjected to hot rolling compounding, each pair of compression rollers comprises a normal-temperature fiber soft roller and a heating smooth roller, and the temperature of the heating smooth roller is 80-90 ℃; the hot rolling speed of each pair of press rolls is 30-50 m/min, and the linear pressure of the press rolls is 100-300N/cm. The method does not use adhesive, and the prepared thermal insulation jute non-woven fabric packaging material has good environmental protection property, excellent mechanical property and thermal insulation property.
Description
Technical Field
The invention belongs to the technical field of jute non-woven fabric packaging materials, and relates to an environment-friendly heat-preservation jute non-woven fabric packaging material and a preparation method thereof.
Background
With the rapid development of takeaway and cold chain transportation, the demand of heat insulation materials is increasing day by day. At present, a layer of aluminum foil is adhered to the surface of heat-insulating cotton for packaging, so that the heat-insulating material is not biodegradable and pollutes the environment after being discarded. Therefore, the development of the environment-friendly heat-insulation packaging material has a far-reaching significance.
China is one of the most abundant countries of hemp resources in the world, and the jute short fibers have low heat conductivity coefficient, high strength and biodegradability, but are coarse and hard, small in entanglement among fibers, poor in cohesion and difficult to comb into nets. When the thermal insulation material is prepared, hot air adopted in the prior art penetrates through the fiber layer through hot air, so that the fiber net is uniformly heated, bonding fibers are melted to play a bonding role, the hot air non-woven fabric has a good space structure, gaps among the fibers are large, the hot air non-woven fabric is soft and fluffy in touch and has high elasticity and stiffness, and meanwhile, the problem of poor wear resistance is caused by the characteristics.
In order to solve the problem of wear resistance, a film treatment technology can be considered, wherein the polyurethane film has high wear resistance, good elasticity, low heat conductivity coefficient, good characteristics in the aspects of adhesion, oil resistance, low temperature resistance, heat aging resistance and the like, water repellency, biodegradability and no pollution to the environment. However, in the existing preparation process of the non-woven fabric and film composite material, in order to improve the interface bonding fastness, an adhesive is often adopted as an interface layer to improve the interface effect of the composite material. Free formaldehyde in common adhesives such as phenolic aldehyde, urea formaldehyde and melamine formaldehyde, and styrene in unsaturated polyester adhesives cause environmental pollution and harm to human health.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides an environment-friendly heat-insulating jute non-woven fabric packaging material and a preparation method thereof.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a method for preparing environment-friendly heat-insulating jute non-woven fabric packaging material comprises the following steps of firstly, preparing a needle-punched fiber net by using jute short fibers and skin-core polyurethane short fibers as main raw materials; then the needle punched fiber net is bonded by hot air to form a hot air bonding fiber net; then the hot air bonding fiber net and the polyurethane film are subjected to hot rolling compounding by two pairs of press rolls in sequence to prepare a heat-insulating jute non-woven fabric packaging material;
the mass content of jute fiber in the raw material is not less than 50 percent, and the mass content of sheath-core polyurethane short fiber is not less than 30 percent;
when two pairs of compression rollers are subjected to hot rolling compounding, each pair of compression rollers comprises a normal-temperature fiber soft roller and a heating smooth roller, and the temperature of the heating smooth roller is 80-90 ℃; the hot rolling speed of each pair of press rolls is 30-50 m/min, and the linear pressure of the rolls is 100-300N/cm.
As a preferred technical scheme:
in the preparation method of the environment-friendly heat-preservation jute non-woven fabric packaging material, the raw materials comprise 50-70% by mass of jute fibers and 30-50% by mass of sheath-core polyurethane short fibers.
The preparation method of the environment-friendly heat-preservation jute non-woven fabric packaging material comprises the following specific process flows of:
compounding jute short fibers and skin-core type polyurethane short fibers, and then primarily mixing and uniformly mixing;
the preliminary mixing is as follows: performing preliminary mixing in a coarse opener;
the uniform mixing is as follows: conveying the primarily mixed fibers to a cotton storage box of a cotton mixer, conveying the fibers through a brad curtain, and allowing the fibers to enter a vibrating cotton box after the fibers are acted by a cotton homogenizing roller and a cotton stripping roller so as to uniformly mix the fibers;
the angle nail curtain speed of the cotton mixing machine is 45-80 m/min, the horizontal curtain speed is 0.3-0.7 m/min, the rotation speed of a cotton homogenizing roller is 582-882 r/min, and the rotation speed of a cotton stripping roller is 412-686 r/min;
opening and carding the uniformly mixed fibers to prepare a fiber web;
feeding the uniformly mixed fibers into a fine opener to further open the raw materials, and outputting the raw materials to an air pressure cotton box through an air pressure pipeline to form sheet cotton type mixed fibers; carding the banquet type mixed fibers into a thin fiber web by a carding machine;
in the carding process, the rotating speed of a licker-in is 600-900 r/min, the rotating speed of a cylinder is 300-500 r/min, the rotating speed of a doffer is 15-40 r/min, and the speed of a working roll is 670-960 r/min;
firstly, lapping and disorderly drafting a fiber web, and reinforcing the fiber web by needling to obtain a needled fiber web;
the lapping mode is cross lapping;
the disorder drafting is to make the laid fiber net pass through a disorder drafting machine to increase the disorder degree of the fiber net structure; the entanglement degree of the fibers during needling is improved, and the draft multiple in the disordered draft process is 2.2-2.6;
the needling density is 100-200 spines/cm in the needling process2The needling depth is 6-8 mm, the needling frequency is 150-350 needling/min, and the number of needling channels is 2;
forming a hot air bonding fiber web by hot air bonding the needle punched fiber web; the fibers in the hot air bonding fiber net are crossed to form a disordered three-dimensional net structure, so that the bulkiness is high, and the hand feeling is soft; the hot air bonding jute fiber net has high bulkiness and can lock more static air inside. And the heat preservation performance of the composite material can be further improved by compounding the composite material with a polyurethane film.
And (3) bonding the fiber net and the polyurethane film by hot air, and performing hot rolling compounding by two pairs of press rolls to prepare the heat-insulating jute non-woven fabric packaging material.
According to the preparation method of the environment-friendly heat-preservation jute non-woven fabric packaging material, the transverse breaking strength of the needled fiber net is 25-40N, the longitudinal breaking strength is 20-30N, the bursting strength is 15-25N, and the wear resistance index is 10-20 times/mg.
According to the preparation method of the environment-friendly heat-preservation jute non-woven fabric packaging material, the hot air bonding temperature is 85-95 ℃ and the time is 10-20 s.
According to the preparation method of the environment-friendly heat-preservation jute non-woven fabric packaging material, the melting point of the skin layer of the skin-core polyurethane short fiber is 70-80 ℃, and the melting point of the core layer is 120-150 ℃.
According to the preparation method of the environment-friendly heat-preservation jute non-woven fabric packaging material, the thickness of the polyurethane film is 0.015-0.02 mm, the heat conductivity coefficient is 0.024W/(m.K), and the melting point is 80 ℃.
The invention also provides the thermal insulation jute non-woven fabric packaging material prepared by the method, wherein the middle layer is a three-layer structure of a hot air bonding fiber net, and the upper layer and the lower layer are polyurethane films; the jute short fibers and the skin-core type polyurethane short fibers in the middle layer are entangled and bonded, and the polyurethane films on the upper layer and the lower layer are bonded with the skins of the skin-core type polyurethane short fibers in the hot air bonding fiber net; the polyurethane film and the jute non-woven fabric are combined by chemical bonds.
As a preferred technical scheme:
according to the heat-insulating jute non-woven fabric packaging material, the polyurethane film and the jute fiber net are combined by chemical bonds, and the interface acting force is strong.
The surface density of the heat-preservation jute non-woven fabric packaging material is 60-80 g/m2The transverse breaking strength is 65-85N, the longitudinal breaking strength is 55-75N, the bursting strength is 40-60N, the abrasion resistance index is 90-110 times/mg, and the heat conductivity coefficient of the heat-insulating jute non-woven fabric packaging material is 0.015-0.02W/(m.K).
The principle of the invention is as follows:
because the jute fiber is coarse and has higher rigidity, the fiber is difficult to form a net in the non-weaving process, and the fiber is not easy to be tangled, so that the strength of the fiber net is low. The skin-core type polyurethane short fiber is added, so that the jute fiber can be formed into a net, and the uniformity of the fiber net is improved. During needling, jute short fibers and slender soft sheath-core polyurethane short fibers are easier to entangle, the strength of the fiber web is improved, but the strength improvement is limited. Therefore, the fiber web is reinforced by a hot air bonding mode, and the strength of the fiber web is further improved. The hot air bonding belongs to a non-contact heating mode, hot air penetrates through a fiber layer to enable fibers to be uniformly heated in a free state, the fibers are uniformly bonded on fiber cross points, and a structure that fibers inside a needled fiber net are crossly entangled is fixed. Since no pressure is applied during heating, the through-air bonded nonwoven material is bulky and soft.
The melting point of the sheath-core polyurethane short fiber is lower than the thermal decomposition temperature of jute fiber, and the sheath-core polyurethane short fiber can be used as bonding fiber. When in hot air bonding, the core layer part with higher melting point is not melted by controlling the temperature of the hot air, plays a role of a skeleton, keeps intertwined with the jute fiber and is in a three-dimensional net structure; the skin layer polyurethane fiber with low melting point is molten, and has good compatibility, compact structure between interfaces and strong bonding effect because of strong hydrogen bond acting force between polyurethane macromolecules and jute short fibers, and a three-dimensional net structure formed by the core layer polyurethane fiber and the jute fiber can be fixed, so that a large amount of static air can be locked, and the heat preservation performance of the fiber is good.
In order to further improve the heat preservation performance and the surface smoothness of the hot air bonding fiber net, the polyurethane film with low heat conductivity coefficient is compounded with the fiber net, and the heat preservation performance is further improved. In general, a pair of hard smooth rolls heated and pressurized at the same time are used in the hot rolling process, but since the smooth rolls are heated at the same time, heat is transferred to the inside of the web at the same time, the heat is concentrated, and the three-dimensional structure in the web is destroyed, resulting in poor heat retaining property. When the hot rolling is carried out, the upper surface of the hot air bonding fiber net is bonded with the polyurethane film through the hot rolling of the pair of upper press rolls serving as heating smooth rolls and the lower press roll serving as a normal-temperature fiber soft roll, and the heat of the upper press rolls is transferred to the inside and the lower layer of the fiber net, so that the heat inside the fiber net is low, the bonding fibers are not melted again, and the three-dimensional structure inside the fiber net is not damaged due to the hot rolling; and hot rolling the fiber net by another pair of press rolls, wherein the upper press roll is a normal-temperature fiber soft roll, the lower press roll is a heating smooth roll, the lower surface of the hot-air bonding fiber net is bonded with the polyurethane film, the heat of the lower press roll is dissipated when being transferred upwards, and similarly, the three-dimensional structure inside the fiber net cannot be damaged by hot rolling.
In the hot rolling process, the polyurethane film and the molten polyurethane fibers on the surface of the fiber net are mutually fused to form a bonding effect; meanwhile, a strong hydrogen bond acting force exists between the polyurethane macromolecules and the jute short fibers, so that the high-compatibility high-strength polyurethane fiber has good compatibility and is tightly combined with an interface.
Advantageous effects
The temperature of hot air bonding in the non-weaving process used in the invention is 85-95 ℃, and the hot air bonding time is 10-20 s; the hot rolling temperature is 80-90 ℃, the hot rolling speed is 30-50 m/min, and the roller line pressure is 100-300N/cm. Under the condition, the bonding strength between the sheath-core polyurethane short fiber and the jute short fiber is high, the polyurethane film is tightly bonded with the hot air bonding fiber net, and the heat-insulating property is excellent. The density of the non-woven fabric is 60-80 g/m2The transverse breaking strength is 65-85N, the longitudinal breaking strength is 55-75N, the bursting strength is 40-60N, the wear-resisting index is 90-110 times/mg, and the heat conductivity coefficient of the heat-insulating jute non-woven fabric packaging material is 0.015-0.02W/(m.K).
Detailed Description
The invention will be further illustrated with reference to specific embodiments. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
The performance index testing method comprises the following steps:
the method for testing the transverse breaking strength comprises the following steps: GB/T24218.3-2010;
the method for testing the longitudinal breaking strength comprises the following steps: GB/T24218.3-2010;
the method for testing bursting strength comprises the following steps: GBT 24218.5-2016;
the abrasion resistance index test method comprises the following steps: GB/T21196.1-2007, GB/T21196.2-2007, GB/T21196.3-2007 and GB/T21196.4-2007;
the method for testing the heat conductivity coefficient comprises the following steps: GBT 22588-.
Example 1
A preparation method of an environment-friendly heat-preservation jute non-woven fabric packaging material comprises the following specific process flows:
(1) compounding jute short fibers (50 percent by mass) and sheath-core polyurethane short fibers (50 percent by mass), and then primarily mixing and uniformly mixing; wherein the melting point of the skin layer of the skin-core type polyurethane short fiber is 80 ℃, and the melting point of the core layer is 150 ℃; when the materials are uniformly mixed, the speed of a fillet nail curtain of a cotton mixing machine is 80m/min, the speed of a horizontal curtain is 0.7m/min, the rotating speed of a cotton homogenizing roller is 882r/min, and the rotating speed of a cotton stripping roller is 686 r/min;
(2) opening and carding the uniformly mixed fibers to prepare a fiber web; wherein, the rotating speed of the licker-in the carding process is 900r/min, the rotating speed of the cylinder is 500r/min, the rotating speed of the doffer is 40r/min, and the speed of the working roll is 960 r/min;
(3) firstly, carrying out cross lapping and disordered drafting with the draft multiple of 2.6 on a fiber web, and then reinforcing the fiber web by needling to obtain a needled fiber web; wherein, in the needling processThe needling density is 200 spines/cm2The needling depth is 8mm, the needling frequency is 350 needling/min, and the number of needling channels is 2;
the transverse breaking strength of the prepared needled fiber web is 40N, the longitudinal breaking strength is 30N, the bursting strength is 25N, and the abrasion resistance index is 20 times/mg.
(4) Forming a hot air bonding fiber web by hot air bonding the needle-punched fiber web; wherein the hot air bonding temperature is 95 ℃ and the time is 10 s;
(5) hot air is used for bonding the fiber net and a polyurethane film (the thickness is 0.02mm, the heat conductivity coefficient is 0.024W/(m.K), the melting point is 80 ℃), and hot rolling compounding is carried out successively by two pairs of press rolls to prepare the heat-preservation jute non-woven fabric packaging material; when the two pairs of compression rollers are subjected to hot rolling compounding, the two pairs of compression rollers comprise a normal-temperature fiber soft roller and a heating smooth roller, and the temperature of the heating smooth roller is 90 ℃; the hot rolling speed of each pair of press rolls is 50m/min, and the linear pressure of the press rolls is 100N/cm;
the prepared thermal insulation jute non-woven fabric packaging material is of a three-layer structure, jute short fibers and skin-core polyurethane short fibers in the middle layer are entangled and bonded, and polyurethane films on the upper surface layer and the lower surface layer are bonded with the skin-core polyurethane short fibers of the needle-punched fiber net; the polyurethane film and the jute non-woven fabric are combined by chemical bonds; the surface density of the packaging material of the heat-preservation jute non-woven fabric is 80g/m2The transverse breaking strength is 85N, the longitudinal breaking strength is 75N, the bursting strength is 60N, the wear-resisting index is 110 times/mg, and the thermal conductivity coefficient of the heat-insulating jute non-woven fabric packaging material is 0.015W/(m.K).
Example 2
A preparation method of an environment-friendly heat-preservation jute non-woven fabric packaging material comprises the following specific process flows:
(1) compounding jute short fibers (55 mass percent) and sheath-core polyurethane short fibers (45 mass percent) and then primarily mixing and uniformly mixing; wherein the melting point of the skin layer of the skin-core type polyurethane short fiber is 80 ℃, and the melting point of the core layer is 150 ℃; when the materials are uniformly mixed, the speed of a fillet nail curtain of a cotton mixing machine is 70m/min, the speed of a horizontal curtain is 0.7m/min, the rotating speed of a cotton homogenizing roller is 812r/min, and the rotating speed of a cotton stripping roller is 622 r/min;
(2) opening and carding the uniformly mixed fibers to prepare a fiber web; wherein, the rotating speed of the licker-in the carding process is 862r/min, the rotating speed of the cylinder is 460r/min, the rotating speed of the doffer is 35r/min, and the speed of the working roll is 912 r/min;
(3) firstly, carrying out cross lapping and disordered drafting with the draft multiple of 2.5 on a fiber web, and then reinforcing the fiber web by needling to obtain a needled fiber web; wherein the needling density in the needling process is 180 needling/cm2The needling depth is 8mm, the needling frequency is 300 needling/min, and the number of needling channels is 2;
the transverse rupture strength of the prepared needle-punched fiber web is 37N, the longitudinal rupture strength is 28N, the bursting strength is 23N, and the abrasion resistance index is 18 times/mg.
(4) Forming a hot air bonding fiber web by hot air bonding the needle punched fiber web; wherein the hot air bonding temperature is 93 ℃, and the time is 12 s;
(5) hot-air bonding the fiber net and a polyurethane film (the thickness is 0.02mm, the heat conductivity coefficient is 0.024W/(m.K), the melting point is 80 ℃), and hot rolling compounding is carried out successively by two pairs of press rolls to prepare the heat-preservation jute non-woven fabric packaging material; when the two pairs of press rolls are subjected to hot rolling compounding, the two pairs of press rolls both comprise a normal-temperature fiber soft roll and a heating smooth roll, and the temperature of the heating smooth roll is 87 ℃; the hot rolling speed of each pair of rollers is 47m/min, and the linear pressure of the rollers is 150N/cm;
the prepared thermal insulation jute non-woven fabric packaging material is of a three-layer structure, jute short fibers and skin-core polyurethane short fibers in the middle layer are entangled and bonded, and polyurethane films on the upper surface layer and the lower surface layer are bonded with the skin-core polyurethane short fibers of the needle-punched fiber net; the polyurethane film and the jute non-woven fabric are combined by chemical bonds; the surface density of the packaging material of the heat-preservation jute non-woven fabric is 76g/m2The transverse breaking strength is 81N, the longitudinal breaking strength is 71N, the bursting strength is 57N, the abrasion resistance index is 106 times/mg, and the thermal conductivity coefficient of the heat-insulating jute non-woven fabric packaging material is 0.016W/(m.K).
Example 3
A preparation method of an environment-friendly heat-preservation jute non-woven fabric packaging material comprises the following specific process flows:
(1) compounding jute short fibers (60 mass percent) and sheath-core polyurethane short fibers (40 mass percent) and then primarily mixing and uniformly mixing; wherein the melting point of the skin layer of the skin-core type polyurethane short fiber is 80 ℃, and the melting point of the core layer is 150 ℃; when the materials are uniformly mixed, the speed of a fillet nail curtain of a cotton mixing machine is 60m/min, the speed of a horizontal curtain is 0.6m/min, the rotating speed of a cotton homogenizing roller is 765r/min, and the rotating speed of a cotton stripping roller is 582 r/min;
(2) opening and carding the uniformly mixed fibers to prepare a fiber web; wherein, the rotating speed of the licker-in the carding process is 812r/min, the rotating speed of the cylinder is 420r/min, the rotating speed of the doffer is 30r/min, and the speed of the working roll is 860 r/min;
(3) firstly, carrying out cross lapping and disordered drafting with the draft multiple of 2.5 on a fiber web, and then reinforcing the fiber web by needling to obtain a needled fiber web; wherein the needling density in the needling process is 160 needling/cm2The needling depth is 7mm, the needling frequency is 270 needling/min, and the number of needling channels is 2;
the transverse rupture strength of the prepared needle-punched fiber web is 34N, the longitudinal rupture strength is 26N, the bursting strength is 21N, and the abrasion resistance index is 16 times/mg.
(4) Forming a hot air bonding fiber web by hot air bonding the needle punched fiber web; wherein the hot air bonding temperature is 93 ℃, and the time is 14 s;
(5) hot-air bonding the fiber net and a polyurethane film (the thickness is 0.02mm, the heat conductivity coefficient is 0.024W/(m.K), the melting point is 80 ℃), and hot rolling compounding is carried out successively by two pairs of press rolls to prepare the heat-preservation jute non-woven fabric packaging material; when the two pairs of compression rollers are subjected to hot rolling compounding, the two pairs of compression rollers comprise a normal-temperature fiber soft roller and a heating smooth roller, and the temperature of the heating smooth roller is 85 ℃; the hot rolling speed of each pair of press rolls is 42m/min, and the linear pressure of the press rolls is 180N/cm;
the prepared thermal insulation jute non-woven fabric packaging material is of a three-layer structure, jute short fibers and skin-core polyurethane short fibers in the middle layer are entangled and bonded, and polyurethane films on the upper surface layer and the lower surface layer are bonded with the skin-core polyurethane short fibers of the needle-punched fiber net; the polyurethane film and the jute non-woven fabric are combined by chemical bonds; thermal insulation jute non-woven fabricThe surface density of the cloth-making packaging material is 72g/m2The transverse breaking strength is 77N, the longitudinal breaking strength is 68N, the bursting strength is 53N, the wear resistance index is 102 times/mg, and the thermal conductivity coefficient of the heat-insulating jute non-woven fabric packaging material is 0.018W/(m.K).
Example 4
A preparation method of an environment-friendly heat-preservation jute non-woven fabric packaging material comprises the following specific process flows:
(1) compounding jute short fibers (with the mass percent of 60%) and skin-core polyurethane short fibers (with the mass percent of 40%) and then primarily mixing and uniformly mixing; wherein the melting point of the skin layer of the skin-core type polyurethane short fiber is 70 ℃, and the melting point of the core layer is 120 ℃; when the materials are uniformly mixed, the speed of a fillet nail curtain of a cotton mixing machine is 55m/min, the speed of a horizontal curtain is 0.5m/min, the rotating speed of a cotton homogenizing roller is 700r/min, and the rotating speed of a cotton stripping roller is 512 r/min;
(2) opening and carding the uniformly mixed fibers to prepare a fiber web; wherein, the rotating speed of the licker-in the carding process is 756r/min, the rotating speed of the cylinder is 380r/min, the rotating speed of the doffer is 25r/min, and the speed of the working roll is 786 r/min;
(3) firstly, performing cross lapping and disordered drafting with the draft multiple of 2.4 on a fiber web, and reinforcing the fiber web by needling to obtain a needled fiber web; wherein the needling density in the needling process is 140 needling/cm2The needling depth is 7mm, the needling frequency is 240 needling/min, and the number of needling channels is 2;
the transverse breaking strength of the prepared needle-punched fiber web is 30N, the longitudinal breaking strength is 24N, the bursting strength is 18N, and the abrasion resistance index is 15 times/mg.
(4) Forming a hot air bonding fiber web by hot air bonding the needle punched fiber web; wherein the hot air bonding temperature is 90 ℃ and the time is 16 s;
(5) hot-air bonding the fiber net and a polyurethane film (the thickness is 0.015mm, the heat conductivity coefficient is 0.024W/(m.K), the melting point is 80 ℃), and hot rolling compounding is carried out successively by two pairs of press rolls to prepare the heat-preservation jute non-woven fabric packaging material; when the two pairs of press rolls are subjected to hot rolling compounding, the two pairs of press rolls both comprise a normal-temperature fiber soft roll and a heating smooth roll, and the temperature of the heating smooth roll is 83 ℃; the hot rolling speed of each pair of press rolls is 38m/min, and the linear pressure of the press rolls is 220N/cm;
the prepared thermal insulation jute non-woven fabric packaging material is of a three-layer structure, jute short fibers and skin-core polyurethane short fibers in the middle layer are entangled and bonded, and polyurethane films on the upper surface layer and the lower surface layer are bonded with the skin-core polyurethane short fibers of the needle-punched fiber net; the polyurethane film and the jute non-woven fabric are combined by chemical bonds; the surface density of the packaging material of the heat-preservation jute non-woven fabric is 68g/m2The transverse breaking strength is 72N, the longitudinal breaking strength is 63N, the bursting strength is 49N, the wear-resisting index is 98 times/mg, and the thermal conductivity coefficient of the heat-insulating jute non-woven fabric packaging material is 0.018W/(m.K).
Example 5
A preparation method of an environment-friendly heat-preservation jute non-woven fabric packaging material comprises the following specific process flows:
(1) compounding jute short fibers (65 mass percent) and sheath-core polyurethane short fibers (35 mass percent) and then primarily mixing and uniformly mixing; wherein the melting point of the skin layer of the skin-core type polyurethane short fiber is 70 ℃, and the melting point of the core layer is 120 ℃; when the materials are uniformly mixed, the speed of a fillet nail curtain of a cotton mixing machine is 50m/min, the speed of a horizontal curtain is 0.4m/min, the rotating speed of a cotton homogenizing roller is 682r/min, and the rotating speed of a cotton stripping roller is 470 r/min;
(2) opening and carding the uniformly mixed fibers to prepare a fiber web; wherein, the rotating speed of the licker-in the carding process is 686r/min, the rotating speed of the cylinder is 340r/min, the rotating speed of the doffer is 20r/min, and the speed of the working roll is 712 r/min;
(3) firstly, performing cross lapping and disordered drafting with the draft multiple of 2.3 on a fiber web, and reinforcing the fiber web by needling to obtain a needled fiber web; wherein the needling density in the needling process is 120 needling/cm2The needling depth is 6mm, the needling frequency is 200 needling/min, and the number of needling channels is 2;
the transverse rupture strength of the prepared needle-punched fiber web is 27N, the longitudinal rupture strength is 22N, the bursting strength is 17N, and the abrasion resistance index is 14 times/mg.
(4) Forming a hot air bonding fiber web by hot air bonding the needle punched fiber web; wherein the hot air bonding temperature is 87 ℃ and the time is 18 s;
(5) hot-air bonding the fiber net and a polyurethane film (the thickness is 0.015mm, the heat conductivity coefficient is 0.024W/(m.K), the melting point is 80 ℃), and hot rolling compounding is carried out successively by two pairs of press rolls to prepare the heat-preservation jute non-woven fabric packaging material; when the two pairs of press rolls are subjected to hot rolling compounding, the two pairs of press rolls both comprise a normal-temperature fiber soft roll and a heating smooth roll, and the temperature of the heating smooth roll is 83 ℃; the hot rolling speed of each pair of press rolls is 35m/min, and the linear pressure of the press rolls is 260N/cm;
the prepared thermal insulation jute non-woven fabric packaging material is of a three-layer structure, jute short fibers and skin-core polyurethane short fibers in the middle layer are entangled and bonded, and polyurethane films on the upper surface layer and the lower surface layer are bonded with the skin-core polyurethane short fibers of the needle-punched fiber net; the polyurethane film and the jute non-woven fabric are combined by chemical bonds; the surface density of the packaging material of the heat-preservation jute non-woven fabric is 64g/m2The transverse breaking strength is 69N, the longitudinal breaking strength is 59N, the bursting strength is 44N, the wear-resisting index is 94 times/mg, and the thermal conductivity coefficient of the heat-insulating jute non-woven fabric packaging material is 0.02W/(m.K).
Example 6
A preparation method of an environment-friendly heat-preservation jute non-woven fabric packaging material comprises the following specific process flows:
(1) compounding jute short fibers (70 mass percent) and sheath-core polyurethane short fibers (30 mass percent) and then primarily mixing and uniformly mixing; wherein the melting point of the skin layer of the skin-core type polyurethane short fiber is 70 ℃, and the melting point of the core layer is 120 ℃; when the materials are uniformly mixed, the speed of a fillet nail curtain of a cotton mixing machine is 45m/min, the speed of a horizontal curtain is 0.3m/min, the rotating speed of a cotton homogenizing roller is 582r/min, and the rotating speed of a cotton stripping roller is 412 r/min;
(2) opening and carding the uniformly mixed fibers to prepare a fiber web; wherein, the rotating speed of the licker-in the carding process is 600r/min, the rotating speed of the cylinder is 300r/min, the rotating speed of the doffer is 15r/min, and the speed of the working roll is 670 r/min;
(3) firstly, performing cross lapping and disordered drafting with the draft multiple of 2.2 on a fiber web, and then reinforcing the fiber web by needling to obtain a needled fiber web; wherein, the needle is needled in the needling processThe density of the thorn is 100 thorn/cm2The needling depth is 6mm, the needling frequency is 150 needling/min, and the number of needling channels is 2;
the transverse breaking strength of the prepared needled fiber web is 25N, the longitudinal breaking strength is 20N, the bursting strength is 15N, and the abrasion resistance index is 10 times/mg.
(4) Forming a hot air bonding fiber web by hot air bonding the needle punched fiber web; wherein the hot air bonding temperature is 85 ℃ and the time is 20 s;
(5) hot-air bonding the fiber net and a polyurethane film (the thickness is 0.015mm, the heat conductivity coefficient is 0.024W/(m.K), the melting point is 80 ℃), and hot rolling compounding is carried out successively by two pairs of press rolls to prepare the heat-preservation jute non-woven fabric packaging material; when the two pairs of compression rollers are subjected to hot rolling compounding, the two pairs of compression rollers comprise a normal-temperature fiber soft roller and a heating smooth roller, and the temperature of the heating smooth roller is 80 ℃; the hot rolling speed of each pair of press rolls is 30m/min, and the linear pressure of the press rolls is 300N/cm;
the prepared thermal insulation jute non-woven fabric packaging material is of a three-layer structure, jute short fibers and skin-core polyurethane short fibers in the middle layer are entangled and bonded, and polyurethane films on the upper surface layer and the lower surface layer are bonded with the skin-core polyurethane short fibers of the needle-punched fiber net; the polyurethane film and the jute non-woven fabric are combined by chemical bonds; the surface density of the packaging material of the heat-preservation jute non-woven fabric is 60g/m2The transverse breaking strength is 65N, the longitudinal breaking strength is 55N, the bursting strength is 40N, the wear-resisting index is 90 times/mg, and the thermal conductivity coefficient of the heat-insulating jute non-woven fabric packaging material is 0.02W/(m.K).
Claims (8)
1. A preparation method of an environment-friendly heat-preservation jute non-woven fabric packaging material is characterized by comprising the following steps: firstly, preparing a needle-punched fiber net by using jute short fibers and skin-core polyurethane short fibers as main raw materials; then the needle punched fiber net is bonded by hot air to form a hot air bonding fiber net; then the hot air bonding fiber net and the polyurethane film are subjected to hot rolling compounding by two pairs of press rolls in sequence to prepare a heat-insulating jute non-woven fabric packaging material;
the mass content of jute fiber in the raw material is not less than 50 percent, and the mass content of sheath-core polyurethane short fiber is not less than 30 percent;
when two pairs of compression rollers are subjected to hot rolling compounding, each pair of compression rollers comprises a normal-temperature fiber soft roller and a heating smooth roller, and the temperature of the heating smooth roller is 80-90 ℃; the hot rolling speed of each pair of press rolls is 30-50 m/min, and the linear pressure of the press rolls is 100-300N/cm;
the hot rolling compounding by two pairs of press rolls in sequence is as follows: hot rolling by using a pair of upper press rolls as heating smooth rolls and a lower press roll as a normal-temperature fiber soft roll to bond the upper surface of the hot-air bonding fiber web with the polyurethane film, and hot rolling by using another pair of press rolls, wherein the upper press roll is the normal-temperature fiber soft roll, and the lower press roll is the heating smooth roll to bond the lower surface of the hot-air bonding fiber web with the polyurethane film;
the heat-preservation jute non-woven fabric packaging material is of a three-layer structure with a fiber net at the middle layer and a polyurethane film at the upper layer and the lower layer; the jute short fibers and the skin-core type polyurethane short fibers in the middle layer are tangled and bonded, and the upper layer polyurethane film and the lower layer polyurethane film are bonded with the skins of the skin-core type polyurethane short fibers in the hot air bonding fiber net; the polyurethane film and the jute non-woven fabric are combined by chemical bonds.
2. The method for preparing the environment-friendly heat-insulating jute non-woven fabric packaging material according to claim 1, wherein the raw materials comprise 50-70% by mass of jute fiber and 30-50% by mass of sheath-core polyurethane short fiber.
3. The preparation method of the environment-friendly heat-preservation jute non-woven fabric packaging material according to claim 1, characterized by comprising the following specific process flows:
(1) compounding jute short fibers and skin-core type polyurethane short fibers, and then primarily mixing and uniformly mixing;
(2) opening and carding the uniformly mixed fibers to prepare a fiber web;
(3) firstly, lapping and disorderly drafting a fiber web, and reinforcing the fiber web by needling to obtain a needled fiber web;
(4) forming a hot air bonding fiber web by hot air bonding the needle punched fiber web;
(5) and (3) bonding the fiber net and the polyurethane film by hot air, and performing hot rolling compounding by two pairs of press rolls to prepare the heat-insulating jute non-woven fabric packaging material.
4. The method for preparing the environment-friendly heat-insulating jute non-woven fabric packaging material according to claim 3, wherein the transverse breaking strength of the needled fiber web is 25 to 40N, the longitudinal breaking strength is 20 to 30N, the bursting strength is 15 to 25N, and the wear resistance index is 10 to 20 times/mg.
5. The method for preparing the environment-friendly heat-insulating jute non-woven fabric packaging material according to claim 3, wherein the temperature of hot air bonding is 85-95 ℃ and the time is 10-20 s.
6. The method for preparing the environment-friendly heat-insulating jute non-woven fabric packaging material according to claim 3, wherein the melting point of the skin layer of the skin-core polyurethane short fibers is 70-80 ℃, and the melting point of the core layer is 120-150 ℃.
7. The method for preparing the environment-friendly heat-insulating jute non-woven fabric packaging material according to claim 3, wherein the thickness of the polyurethane film is 0.015-0.02 mm, the heat conductivity coefficient is 0.024W/(m.K), and the melting point is 80 ℃.
8. The method for preparing the environment-friendly heat-insulating jute non-woven fabric packaging material according to any one of claims 1 to 7, wherein the surface density of the heat-insulating jute non-woven fabric packaging material is 60 to 80g/m2The transverse breaking strength is 65-85N, the longitudinal breaking strength is 55-75N, the bursting strength is 40-60N, the wear-resisting index is 90-110 times/mg, and the heat conductivity coefficient of the heat-insulating jute non-woven fabric packaging material is 0.015-0.02W/(m.K).
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