CN112281305A

CN112281305A - Preparation method of high-elasticity hot air non-woven material with good recovery

Info

Publication number: CN112281305A
Application number: CN202011112698.8A
Authority: CN
Inventors: 唐模秋; 唐新雄; 黄永星; 莫寒文; 赵日宁; 石海桥
Original assignee: Guangdong Jiasiwei New Material Technology Co ltd
Current assignee: Guangdong Jiasiwei New Material Technology Co ltd
Priority date: 2020-10-16
Filing date: 2020-10-16
Publication date: 2021-01-29

Abstract

The invention discloses a preparation method of a high-elasticity hot-air non-woven material with good restorability, which comprises the steps of fiber opening, supporting forming and web forming, fluffy shaping, reinforcing, cooling shaping and the like. The preparation method of the invention has simple process, and can produce the hot air non-woven material with good fluffiness and high fluffy rebound rate. Tests prove that the high-elasticity hot-air non-woven material prepared by the preparation method of the high-elasticity hot-air non-woven material with good restorability has good bulkiness and high bulkiness rebound rate, meets the requirements of hot pressing and ultrasonic processing, and has the advantages of high restorability and rebound resilience, capability of keeping a full shape after processing and forming, bulkiness and air permeability and the like.

Description

Preparation method of high-elasticity hot air non-woven material with good recovery

Technical Field

The invention relates to the field of materials, in particular to a preparation method of a high-elasticity hot air non-woven material with good recovery property.

Background

The mask is a sanitary article, generally refers to a device which is worn at the mouth and nose part and used for filtering air entering the mouth and nose so as to prevent harmful gas, smell and spray from entering and exiting the mouth and nose of a wearer, and is made of gauze or paper and the like.

The mask has a certain filtering function on air entering the lung, and has a very good effect when being worn in respiratory infectious diseases and working in environments polluted by dust and the like. At present, masks sold on the market are generally divided into rectangular masks and cup-shaped masks, and the rectangular masks mainly comprise disposable medical surgical masks, activated carbon filter masks and the like. Cup-shaped masks are mainly divided into KN types and KP types at home, the KN type masks are suitable for filtering non-oily particles, and the KP type masks are suitable for filtering oily and non-oily particles. The non-oily particles refer to solid and non-oily liquid particles and microorganisms, such as coal dust, cement dust, acid mist, paint mist and the like; oily particles refer to oil smoke, oil mist, asphalt smoke, coke oven smoke, particles in diesel engine tail gas and the like. As for the haze resistance, the KN-grade mask can basically meet the requirements, and the KN-grade mask is also preferred by the public. The number behind the letter of the mask represents the protection grade of the mask, and the larger the number is, the higher the protection grade is. For example, 90 represents a filtering effect of 90% or more, and 95 represents a filtering effect of 95% or more.

As shown in the utility model with application number 201120051410.0, it discloses a disposable mask, which comprises four layers, the first layer is a non-woven fabric, the second layer is melt-blown fabric, the third layer is hot-air fabric, and the fourth layer is a non-woven fabric.

Most of the prior KN series masks have the structure, and the mask body generally comprises four layers. Among these, the most important are the two layers of material in the middle: one layer is a melt-blown cloth layer which is the core determining the filtering effect of the mask; the other layer is a hot air non-woven fabric layer which mainly plays a role in supporting and shaping. With the KN95 mask as a main article in protective articles for people, the mask has higher requirements on the filtering effect of the melt-blown fabric layer and the hot air non-woven fabric layer. The hot air non-woven fabric layer of the KN series mask on the market still has room for improvement in the performances of shaping, supporting, fluffing and the like.

Disclosure of Invention

The invention aims to provide a preparation method of a high-elasticity hot-air non-woven material which meets the requirements of hot-pressing processing and ultrasonic processing and has the advantages of high recovery, rebound resilience, full shape after processing and forming, fluffy ventilation and the like, and the preparation method has good recovery, and can at least solve one of the problems.

According to one aspect of the invention, the preparation method of the high-elasticity hot air non-woven material with good recovery performance is provided, and comprises the following steps:

s1, opening fibers: opening the fed ES fibers into a loose fibrous shape by an opening device;

s2, supporting and forming a net: carding, forming and forming a net by using at least one carding device on the fibers loosened in the step S1, and enabling the fibers to be supported in a mutually crossed mode;

s3, fluffy sizing: fluffing and shaping the web-formed hot air non-woven material prepared in the step S2 through a fluffy shaping device;

s4, reinforcement: compacting and reinforcing the upper and lower surfaces of the fluffy and shaped hot air non-woven material obtained in the step S3 through a reinforcing device;

s4, cooling and shaping: and cooling the hot air non-woven material reinforced in the step S4 by a cooling device and outputting the cooled hot air non-woven material.

The preparation method comprises the working procedures of fiber opening, supporting forming and web forming, fluffy shaping, reinforcing, cooling and shaping and the like, and the hot air non-woven material with good fluffy property and high fluffy rebound rate can be produced by simple working procedures. Tests prove that the high-elasticity hot-air non-woven material prepared by the preparation method of the high-elasticity hot-air non-woven material with good restorability has good bulkiness and high bulkiness rebound rate, the thickness of the high-elasticity hot-air non-woven material before rebound is 3.01mm, the rebound rate after 30min is 26.6%, the rebound rate after 60min is 31.6%, the rebound rate after 120min is 42.3%, the rebound rate after 240min is 50.5%, and the rebound rate after 720min is 61.8%. The high-elasticity hot-air non-woven material prepared by the preparation method of the high-elasticity hot-air non-woven material with good restorability has the advantages of simultaneously meeting hot pressing processing and ultrasonic processing, having high restorability and rebound resilience, being capable of keeping a full shape after processing and forming, being fluffy and breathable and the like.

In some embodiments, in step S1, the ES fibers are composed as stereo-crimped ES composite fibers.

In some embodiments, the ES fibers have a denier of 1.2 to 7 denier and a length of 38 to 51 mm.

In some embodiments, in step S2, the carding device comprises a chest cylinder, a middle transfer roller, a big cylinder, a doffer and a disorder roller which are arranged in sequence from the feeding end to the discharging end, and the speed ratio of the doffer to the disorder roller is 1.6-2.3.

In some embodiments, the random rollers are two groups, namely a first random roller group and a second random roller group, each group of random roller groups comprises an upper random roller and a lower random roller, and the speed ratio of the two adjacent random rollers is 1.1-1.5.

In some embodiments, in step S3, the fluffy shaping device is a thermal bonding oven, and a plurality of sections of heating boxes are arranged from the feeding end to the discharging end of the fluffy shaping device, and the heating shaping temperature in each section of heating box is in gradient.

In some embodiments, 5 sections of heating boxes are arranged from the feeding end to the discharging end of the fluffy shaping device, the shaping temperature of the first section of heating box is 129-137 ℃, and the frequency of the fan is 8-15 Hz; the setting temperature of the second section of heating box body is 129-137 ℃, and the frequency of a fan is 10-20 Hz; the setting temperature of the third section of heating box body is 130-140 ℃, and the frequency of a fan is 15-25 Hz; the setting temperature of the fourth section of heating box body is 130-140 ℃, and the frequency of a fan is 20-35 Hz; the setting temperature of the fifth section of heating box body is 128-135 ℃, and the frequency of the fan is 20-35 Hz.

In some embodiments, in step S4, the reinforcing device comprises three smooth rolls with adjustable spacing, the spacing between the smooth rolls is adjusted within a range of 1.3-7 mm, the heating temperature of the three smooth rolls is 60-140 ℃, and the distance between the smooth roll and the outlet end of the fluffy shaping device is 50-200 mm.

In some embodiments, in step S5, the cooling device is composed of a pair of cooling rollers, and the cooling temperature of the cooling device is 5 to 30 ℃.

In some embodiments, after step S5, the method further includes:

s6, rolling: and (4) winding the hot-air non-woven material cooled in the step (S5) by a winding device.

The invention has the beneficial effects that:

the invention discloses a brand-new preparation method of a hot air non-woven material, which comprises the working procedures of fiber opening, supporting forming and web forming, fluffy shaping, reinforcing, cooling and shaping and the like, and the working procedures are simple, but the hot air non-woven material with good fluffiness and high fluffy rebound rate can be produced. Tests prove that the high-elasticity hot-air non-woven material prepared by the preparation method of the high-elasticity hot-air non-woven material with good restorability has good bulkiness and high bulkiness rebound rate, the thickness of the high-elasticity hot-air non-woven material before rebound is 3.01mm, the rebound rate after 30min is 26.6%, the rebound rate after 60min is 31.6%, the rebound rate after 120min is 42.3%, the rebound rate after 240min is 50.5%, and the rebound rate after 720min is 61.8%. The high-elasticity hot-air non-woven material prepared by the preparation method of the high-elasticity hot-air non-woven material with good restorability has the advantages of simultaneously meeting hot pressing processing and ultrasonic processing, having high restorability and rebound resilience, being capable of keeping a full shape after processing and forming, being fluffy and breathable and the like.

Drawings

Fig. 1 is one of simplified schematic diagrams illustrating a manufacturing process of a method for manufacturing a highly elastic hot air non-woven material having good recovery properties according to an embodiment of the present invention;

FIG. 2 is a second simplified schematic diagram of a process for preparing the highly elastic hot air non-woven material with good recovery property shown in FIG. 1;

FIG. 3 is a simplified block diagram of a system for making the highly elastic, hot air non-woven material of FIG. 1;

fig. 4 is a simplified structural diagram of a system for producing the highly elastic heated air nonwoven material having good recovery properties shown in fig. 1.

Reference numerals in FIGS. 1 to 4: 21-a feeding device; 22-an opening device; 23-a first cotton mixing box; 24-a second cotton mixing box; 25-a carding unit; 26-fluffy sizing device; 27-a reinforcement device; 28-a cooling device; 29-a winding device; 251-thoracic cylinder; 252-a middle transfer roller; 253-big cylinder; 254-doffer; 255-random rollers.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Fig. 1 to 4 schematically show a method for producing a highly elastic hot air nonwoven material having excellent recovery properties according to an embodiment of the present invention.

As shown in fig. 1 to 4, the preparation method of the high-elasticity hot-air non-woven material with good recovery property comprises the following steps:

s1, opening fibers: the fed ES fibers are opened into a loose fibrous form by an opening device 22.

In the step, the denier of the ES fiber is 1.2-7 denier, and the length is 38-51 mm.

The selected ES fibers are as follows: the hydrophilic three-dimensional crimped ES fiber is 2.5D multiplied by 40mm in specification, and the mass percent is 60 percent; the hydrophilic three-dimensional crimp ES fiber is 2.0D multiplied by 38mm in specification and 40% in mass percentage. The specific opening process is as follows: the method comprises the steps of unpacking three-dimensional curled ES fibers (PE/PET), putting the unpacked ES fibers into a feeding device 21, feeding the unpacked ES fibers into an opening device 22 through the feeding device 21, and grabbing the two agglomerated ES fibers to a high-speed beater through a barbed nail inclined curtain by the opening device 22 to open the agglomerated ES fibers into small pieces or bunched fibers. The two ES fibers are mixed and then are further mixed and loosened through air flow conveying, and then are sequentially conveyed to the first cotton mixing box 23 and the second cotton mixing box 24 for mixing and loosening. The feeding device 21, the opening device 22, the first cotton mixing box 23 and the second cotton mixing box 24 of the present embodiment are all common devices.

S2, supporting and forming a net: the fibers opened in step S1 are carded, formed into a web by at least one carding device 25, and the fibers are supported by being crossed with each other at a high degree.

In the step, the carding device 25 comprises a chest cylinder 251, a middle transfer roller 252, a large cylinder 253, a doffer 254 and a disorder roller 255 which are arranged in sequence from a feeding end to a discharging end, and the speed ratio of the doffer 254 to the disorder roller 255 is 1.6-2.3.

As shown in fig. 4, the disorder rollers 255 of the present embodiment are provided in two sets, namely, a first disorder roller 255 set and a second disorder roller 255 set, and the second disorder roller 255 set is disposed behind the first disorder roller 255 set. Each group of disordered rollers 255 comprises an upper disordered roller 255 and a lower disordered roller 255, and the speed ratio of the front and rear adjacent disordered rollers 255 is 1.1-1.5.

The specific comber is as follows: the opened and mixed ES fibers are pre-carded by a chest cylinder 251 provided with four groups of working rollers, and transferred to a large cylinder 253 provided with five groups of working rollers by a middle transfer roller 252 for fine carding. The fibers are stripped and transferred by the upper doffer 254 and the lower doffer 254 after the large cylinder 253, the original sequence of the fibers is disturbed by the pair of disorder rollers 255, wherein the speed ratio of the doffer 254 and the disorder rollers 255 can be further selectively set to 1.9, and the speed ratio of the front disorder rollers 255 and the rear disorder rollers 255 can be further selectively set to 1.23, so that the fiber heights are mutually supported in an intersecting way, and a supporting type fluffy fiber layer is formed.

S3, fluffy sizing: the web-formed hot-air nonwoven material obtained in step S2 is subjected to bulky setting by a bulky setting device 26.

In this step, the bulk setting device 26 may be a thermal bonding oven. A plurality of sections of heating boxes are arranged from the feeding end to the discharging end of the fluffy shaping device 26. The heating and shaping temperature in each section of heating box body is in gradient.

Further, 5 sections of heating boxes are arranged from the feeding end to the discharging end of the fluffy shaping device 26. The setting temperature of the first section of heating box body is 129-137 ℃, and the frequency of a fan is 8-15 Hz; the setting temperature of the second section of heating box body is 129-137 ℃, and the frequency of a fan is 10-20 Hz; the setting temperature of the third section of heating box body is 130-140 ℃, and the frequency of a fan is 15-25 Hz; the setting temperature of the fourth section of heating box body is 130-140 ℃, and the frequency of a fan is 20-35 Hz; the setting temperature of the fifth section of heating box body is 128-135 ℃, and the frequency of the fan is 20-35 Hz.

The concrete use is as follows: and (4) guiding the support type fluffy fiber layer formed in the step (S2) into a fluffy shaping box body, wherein the shaping temperature of the first section of the box body can be further selected to be 133.1 ℃, the fan frequency can be further selected to be 10Hz, the shaping temperature of the second section can be further selected to be 134.6 ℃, the fan frequency can be further selected to be 15Hz, the shaping temperature of the third section can be further selected to be 134.6 ℃, the fan frequency can be further selected to be 20Hz, the shaping temperature of the fourth section can be further selected to be 135.0 ℃, the fan frequency can be further selected to be 25Hz, the shaping temperature of the fifth section can be further selected to be 133.0 ℃ and the fan frequency can be further selected to be 25 Hz.

S4, reinforcement: the upper and lower surfaces of the air-through nonwoven material fluffed and set in step S3 are densely consolidated by the consolidation means 27.

In this step, the reinforcing device 27 comprises three smooth rolls with adjustable gauge. The adjusting range of the spacing between the smooth surface rollers is 1.3-7 mm, the heating temperature of the three smooth surface rollers is 60-140 ℃, and the distance between the smooth surface rollers and the outlet end of the fluffy shaping device 26 is 50-200 mm.

The concrete use is as follows: and melting and reinforcing the surface fibers of the fluffy fiber layer from the fluffy shaping box body by three smooth rollers. Wherein, the distance between the smooth roll closest to the fluffy shaping box body and the outlet of the fluffy shaping box body is 60mm, the distance between the smooth roll closest to the fluffy shaping box body and the middle smooth roll is 3.5mm, and the distance between the middle smooth roll and the smooth roll farthest from the fluffy shaping box body is 3.2 mm. The heating temperature of the three smooth surface rollers is 80 ℃, 120 ℃ and 105 ℃ in sequence.

S4, cooling and shaping: the heated air nonwoven material consolidated in step S4 is cooled by the cooling device 28 and output.

In the step, the cooling device 28 consists of a pair of cooling rollers, and the cooling temperature of the cooling device 28 is 5-30 ℃. The cooling roll of the embodiment is a water cooling roll, the cooling temperature can be further selected to be 23 ℃, and the high-elasticity hot air non-woven material with good recovery property can be prepared after cooling.

In some embodiments, after step S5, the method further includes:

s6, rolling: the hot air nonwoven material cooled in step S5 is wound up by the winding device 29.

In the actual use process, the high-elasticity hot-air non-woven material with good recovery property prepared in the step S5 can be directly applied to producing masks such as KN95 and the like or other sanitary materials, and can also be directly rolled by the rolling device 29 for standby.

The invention discloses a brand-new preparation method of a hot air non-woven material, which comprises the working procedures of fiber opening, supporting forming and web forming, fluffy shaping, reinforcement, cooling shaping and the like, and is simple in working procedure.

And (3) performance testing:

the high-elasticity hot-air non-woven material with good restorability prepared in the above embodiment is subjected to a product performance test.

(1) And (3) weight test:

testing an instrument: one thousandth electronic balance; the test method comprises the following steps: GB/T24218.1-2009; the test results are given in table 1 below.

TABLE 1 weight test results recording Table

Examples	Quantitative gram weight (g/m2)
		High-elasticity hot-air non-woven material with good recovery	50

(2) And (3) thickness testing:

testing an instrument: : YG141 fabric thickness tester; the test method comprises the following steps: GB/T24218.2-2009; and (3) testing conditions are as follows: 0.5kPa, 10 s. The test results are shown in table 2 below.

TABLE 2 thickness test result recording table

As can be seen from the above examples and test structures, the high-elasticity hot-air nonwoven material prepared by the method for preparing a high-elasticity hot-air nonwoven material with good recovery property of the present invention has good bulkiness and high bulk rebound resilience, and has a thickness of 3.01mm before rebound, a rebound resilience after 30min of 26.6%, a rebound resilience after 60min of 31.6%, a rebound resilience after 120min of 42.3%, a rebound resilience after 240min of 50.5%, and a rebound resilience after 720min of 61.8%. The high-elasticity hot-air non-woven material prepared by the preparation method of the high-elasticity hot-air non-woven material with good restorability has the advantages of simultaneously meeting hot pressing processing and ultrasonic processing, having high restorability and rebound resilience, being capable of keeping a full shape after processing and forming, being fluffy and breathable and the like.

What has been described above are merely some embodiments of the present invention. It will be apparent to those skilled in the art that various changes and modifications can be made without departing from the inventive concept thereof, and these changes and modifications can be made without departing from the spirit and scope of the invention.

Claims

1. The preparation method of the high-elasticity hot air non-woven material with good recovery performance is characterized by comprising the following steps of:

s1, opening fibers: opening the fed ES fibers into a loose fibrous form by an opening device (22);

s2, supporting and forming a net: carding, forming and forming the fibers opened in the step S1 into a net through at least one carding device (25) to enable the fibers to be supported in a high-degree cross way;

s3, fluffy sizing: fluffing and shaping the web-formed hot air non-woven material prepared in the step S2 through a fluffing and shaping device (26);

s4, reinforcement: the upper surface and the lower surface of the hot air non-woven material which is fluffy and shaped in the step S3 are densely reinforced through a reinforcing device (27);

s4, cooling and shaping: and (3) cooling the hot air non-woven material reinforced in the step (S4) by a cooling device (28) and outputting the cooled hot air non-woven material.

2. The method of claim 1, wherein in step S1, the ES fiber composition is a three-dimensionally crimped ES composite fiber.

3. The preparation method of the high-elasticity hot-air non-woven material with good recovery property according to claim 2, wherein the ES fibers have a denier of 1.2-7 and a length of 38-51 mm.

4. The method for preparing a highly elastic hot air non-woven material with good recovery property according to claim 1, wherein in step S2, the carding device (25) comprises a breast cylinder (251), a middle transfer roller (252), a big cylinder (253), a doffer (254) and a disorder roller (255) which are arranged in sequence from a feeding end to a discharging end, and the speed ratio of the doffer (254) to the disorder roller (255) is 1.6-2.3.

5. The method for preparing a highly elastic hot air non-woven material with good recovery property according to claim 4, wherein the random rollers (255) are divided into two groups, namely a first random roller (255) group and a second random roller (255) group, each random roller (255) group comprises an upper random roller (255) and a lower random roller (255), and the speed ratio of the two adjacent random rollers (255) is 1.1-1.5.

6. The method of producing a highly elastic heated air nonwoven material with good recovery properties according to claim 1, wherein in step S3, the fluffy shaping device (26) is a thermal bonding oven, a plurality of sections of heating boxes are arranged from the feeding end to the discharging end of the fluffy shaping device (26), and the heating and shaping temperatures in the sections of heating boxes are gradient.

7. The preparation method of the high-elasticity hot-air non-woven material with good restorability according to claim 6, wherein 5 sections of heating boxes are arranged from the feeding end to the discharging end of the fluffy shaping device (26), the shaping temperature of the first section of heating box is 129-137 ℃, and the fan frequency is 8-15 Hz; the setting temperature of the second section of heating box body is 129-137 ℃, and the frequency of a fan is 10-20 Hz; the setting temperature of the third section of heating box body is 130-140 ℃, and the frequency of a fan is 15-25 Hz; the setting temperature of the fourth section of heating box body is 130-140 ℃, and the frequency of a fan is 20-35 Hz; the setting temperature of the fifth section of heating box body is 128-135 ℃, and the frequency of the fan is 20-35 Hz.

8. The method for preparing a highly elastic hot air non-woven material with good restorability according to any one of claims 1 to 7, wherein in step S4, the reinforcing means (27) comprises three smooth rolls with adjustable gauge, the gauge between the smooth rolls is adjusted within a range of 1.3 to 7mm, the heating temperature of the three smooth rolls is 60 to 140 ℃, and the distance between the smooth rolls and the outlet end of the fluffy shaping means (26) is 50 to 200 mm.

9. The method for producing a highly elastic hot-air nonwoven material having good restorability according to any one of claims 1 to 7, wherein the cooling device (28) is composed of a pair of cooling rolls, and the cooling temperature of the cooling device (28) is 5 to 30 ℃ in step S5.

10. The method for preparing a highly elastic hot air non-woven material with good recovery property according to any one of claims 1 to 7, further comprising, after step S5:

s6, rolling: and (3) winding the hot air non-woven material cooled in the step (S5) by a winding device (29).