CN114411339B

CN114411339B - Production process of medical non-woven fabric with one-way elasticity and medical non-woven fabric

Info

Publication number: CN114411339B
Application number: CN202210099010.XA
Authority: CN
Inventors: 周立新; 周祥元
Original assignee: SUZHOU EMY MEDICAL SUPPLIES CO Ltd
Current assignee: SUZHOU EMY MEDICAL SUPPLIES CO Ltd
Priority date: 2022-01-25
Filing date: 2022-01-25
Publication date: 2023-04-14
Anticipated expiration: 2042-01-25
Also published as: CN114411339A

Abstract

The application relates to the field of non-woven fabrics, and particularly discloses a production process of medical non-woven fabrics with unidirectional elasticity and the medical non-woven fabrics. The production process of the medical non-woven fabric with the unidirectional elasticity comprises the following steps of S1, melting raw materials: s2, spinning; s3, cooling and forming the spinning: s4, preparing a fiber web; and S5, feeding the fiber web into an oven, simultaneously performing unidirectional stretching on two side edges of the fiber web, gradually shrinking along the conveying direction of the fiber web, gradually reducing the temperature in the oven along the conveying direction of the fiber web, and naturally cooling to room temperature to obtain the unidirectional elastic non-woven fabric. The production process of the medical non-woven fabric with the unidirectional elasticity has the effect of enabling the non-woven fabric to obtain excellent unidirectional elasticity.

Description

Production process of medical non-woven fabric with one-way elasticity and medical non-woven fabric

Technical Field

The application relates to the field of non-woven fabrics, in particular to a production process of medical non-woven fabrics with unidirectional elasticity and the medical non-woven fabrics.

Background

The non-woven fabric is a non-woven fabric which is formed by mechanically making fibers into a net, then carrying out spunlace, needling or hot rolling reinforcement, and finally carrying out after-treatment, and has the excellent performances of light weight, softness, antibiosis and the like. In the specific production process, the production process generally comprises the steps of melting raw materials, spinning, cooling and forming, preparing a fiber web, drying and cooling to room temperature, wherein in the drying step, the formed non-woven fabric is subjected to thermal shrinkage through an oven, so that the non-woven fabric has certain shrinkage.

However, in the actual preparation process, the non-woven fabric which is directly dried and thermally shrunk has certain contractibility, but the contractibility is lower, and the effect is poor particularly when the non-woven fabric with unidirectional elasticity is prepared.

Disclosure of Invention

In order to effectively ensure that the non-woven fabric has excellent unidirectional elasticity, the application provides a production process of medical non-woven fabric with unidirectional elasticity and the medical non-woven fabric.

In a first aspect, the application provides a production process of medical non-woven fabric with unidirectional elasticity, which adopts the following technical scheme: the production process of the medical non-woven fabric with the unidirectional elasticity comprises the following steps:

s1, melting raw materials:

s2, spinning;

s3, cooling and forming the spinning:

s4, preparing a fiber web;

and S5, feeding the fiber web into an oven, simultaneously performing unidirectional stretching on two side edges of the fiber web, gradually contracting along the conveying direction of the fiber web, gradually reducing the temperature in the oven along the conveying direction of the fiber web, and naturally cooling to room temperature to obtain the unidirectional elastic non-woven fabric.

By adopting the technical scheme, the fiber web originally has certain density, the good shrinkage effect is difficult to obtain by directly carrying out thermal shrinkage, and the fiber web is stretched and then thermally shrunk without certain directivity in the shrinkage process, so that the non-woven fabric can obtain the shrinkage in a specific direction and has excellent shrinkage; and the temperature is gradually reduced, so that the contractibility of the non-woven fabric can be further maintained.

In a specific possible embodiment, the maximum temperature in the oven is between 150 ℃ and 170 ℃ and the minimum temperature is between 50 ℃ and 60 ℃.

In a specific possible embodiment, the maximum temperature inside the oven is 160 ℃ and the minimum temperature is 60 ℃.

By adopting the technical scheme, the non-woven fabric can obtain excellent shrinkage performance.

In a specific embodiment, the nonwoven fabric is cooled to room temperature within 2-4 mm after exiting the oven.

Through adopting above-mentioned technical scheme, the non-woven fabrics is through the pyrocondensation back, again to non-woven fabrics rapid cooling to can further ensure that the non-woven fabrics obtains good shrink performance.

In a specific embodiment, in step S5, the web is first stretched to an increase in width of 30-35% of the original width and then gradually contracted to a natural state.

By adopting the technical scheme, the possibility of irreversible deformation of the non-woven fabric due to over-stretching is reduced, and meanwhile, the non-woven fabric can be ensured to obtain excellent shrinkage performance.

In a specific embodiment, the oven includes the support frame, be equipped with on the support frame and be used for the heating cabinet, be equipped with the relative backup pad that sets up on the support frame, the backup pad runs through the heating cabinet, it is equipped with the slide to slide in the backup pad, be equipped with the mounting panel on the slide, it has a plurality of supporting rods of slidable to run through on the mounting panel, the one end of supporting rod is equipped with the centre gripping subassembly that is used for the centre gripping non-woven fabrics, and the other end ball articulates there is the gyro wheel, be equipped with the deflector that is located slide one side in the backup pad, the deflector is opened there is the gliding spout of confession gyro wheel, two interval between the spout reduces along the length direction of backup pad gradually.

Through adopting above-mentioned technical scheme, when the board that slides moved in the backup pad, the supporting rod can take place to slide on the mounting panel under the spacing of deflector, and the supporting rod can move towards another backup pad to can reduce the tensile force to the non-woven fabrics, reach the tensile purpose of progressively contracting to the non-woven fabrics.

In a specific possible implementation scheme, a driving motor is arranged on the sliding plate, a rotating gear is mounted on an output shaft of the driving motor, and a rack plate meshed with the rotating gear is arranged on the supporting plate.

Through adopting above-mentioned technical scheme, utilize the meshing of rotating gear and rack on the rack board for driving motor can drive the shifting board and remove.

In a specific implementation scheme, the clamping assembly comprises a bearing block arranged on a clamping rod, an installation rod is arranged on the clamping rod, a pressing rod is connected to the installation rod in a threaded manner, and a pressing block is arranged on the pressing rod.

Through adopting above-mentioned technical scheme, through rotating the pressure bar and remove with drive pressure piece orientation bearing piece to utilize pressure piece and bearing piece to reach the purpose of centre gripping non-woven fabrics side.

In a specific implementation scheme, the support frame is provided with two threaded rods and a power motor connected to the threaded rods, the threaded rods are provided with threads in opposite directions, and the threaded rods penetrate through the two support plates and are in threaded connection with the support plates.

Through adopting above-mentioned technical scheme, adjustable two backup pads are from interval for the oven can be used to the non-woven fabrics of different specifications.

In a second aspect, the present application provides a unidirectional elastic nonwoven fabric, which adopts the following technical scheme:

the medical non-woven fabric is prepared by adopting a production process of the medical non-woven fabric with unidirectional elasticity.

In summary, the present application has the following beneficial effects:

1. this application adopts the method to stretch simultaneously and pyrocondensation to the non-woven fabrics for the non-woven fabrics can obtain good shrink performance, makes it have the elasticity of specific direction.

2. This application can further effectively ensure that the non-woven fabrics can maintain good shrink performance through the non-woven fabrics rapid cooling to coming out through the heating cabinet.

Drawings

Fig. 1 is a schematic view of the structure of the oven in example 1.

FIG. 2 is a schematic view showing the connection of the support plate, the clamping rods and the guide plate in example 1.

Fig. 3 is a plan view of the guide plate in embodiment 1.

Fig. 4 is an enlarged view of a portion a in fig. 2.

Fig. 5 is a sectional view of the heating tank in embodiment 1.

Fig. 6 is an enlarged view of a portion B in fig. 5.

Fig. 7 is a sectional view of a cooling tank in embodiment 9.

Description of reference numerals: 1. a support body; 11. a guide bar; 12. a threaded rod; 13. a power motor; 2. a heating box; 21. heating plates; 211. an installation port; 212. an air blowing port; 213. heating wires; 214. a first fan; 3. a support plate; 31. a sliding groove; 32. a rack plate; 33. a guide plate; 331. a chute; 4. a slide plate; 41. a drive motor; 411. a rotating gear; 42. mounting a plate; 43. a clamping rod; 431. a roller; 44. a clamping assembly; 441. a bearing block; 442. mounting a rod; 443. a pressing rod is abutted; 444. a pressing block; 5. a cooling tank; 51. a second fan.

Detailed Description

The present application will be described in further detail with reference to the following drawings and examples.

Examples

Example 1

The production process of the medical non-woven fabric with the unidirectional elasticity comprises the following steps:

s1, putting raw material polyurethane into a screw extruder, and extruding a melt;

s2, putting the melt into a spinning box to be extruded into filaments;

s3, cooling and shaping the extruded filaments in a blowing mode, wherein the temperature of wind is 25 ℃;

s4, feeding the filaments obtained in the step S3 into a starting machine, a carding machine, a lapping machine, a pre-needling machine, a barb machine and a main needling machine in sequence, and then carrying out hot rolling, wherein the temperature of a hot rolling upper roll is 90 ℃, the temperature of a hot rolling lower roll is 85 ℃, and the manufactured gram weight is 25g/m ² The web of (a);

s5, feeding the fiber web into an oven, simultaneously performing unidirectional stretching on two side edges of the fiber web, stretching the width of the fiber web to a width increment of 30% of the original width, gradually reducing the stretching of the fiber web in the conveying process until the fiber web is restored to a natural state, gradually reducing the temperature of the oven from 150 ℃ to 50 ℃ along the conveying direction of the fiber web, outputting the fiber web through the oven, and naturally cooling to room temperature to obtain the unidirectional elastic non-woven fabric.

Referring to fig. 1 and fig. 2, the oven in this embodiment includes a support frame, the support frame includes two support bodies 1 that are disposed oppositely and are U-shaped, the two support bodies 1 jointly support a heating box 2, and the heating box 2 is provided with a cloth inlet and a cloth outlet. The two ends of the support body 1 between the two support bodies 1 are both connected with a guide rod 11 and a threaded rod 12, and the support body 1 is provided with a power motor 13 connected to the threaded rod 12. Be equipped with two rectangular backup pads 3 between two supporters 1, guide bar 11 runs through backup pad 3 and backup pad 3 can slide on guide bar 11, is equipped with opposite direction's screw thread on threaded rod 12, threaded rod 12 run through two backup pads 3 and with 3 threaded connection of backup pad, when power motor 13 drive threaded rod 12 rotates, can make two backup pads 3 be close to each other or keep away from each other.

Referring to fig. 2, a sliding groove 31 is formed in the top surface of the support plate 3 along the length direction of the support plate 3, a sliding plate 4 is arranged on the top surface of the support plate 3, and a sliding strip located in the sliding groove 31 is arranged on the bottom surface of the sliding plate 4, so that the sliding plate 4 can only move along the length direction of the support plate 3. The driving motor 41 is installed on the sliding plate 4, the rotating gear 411 is installed on the output shaft of the driving motor 41, the rack plate 32 is arranged on the side face of the supporting plate 3 along the length direction of the supporting plate 3, and the rotating gear 411 is meshed with the rack on the rack plate 32, so that after the driving motor 41 is started, the sliding plate 4 can be driven to move along the length direction of the supporting plate 3.

Referring to fig. 2 and 3, a mounting plate 42 is mounted on the sliding plate 4, a plurality of uniformly distributed clamping rods 43 penetrate through the mounting plate 42 in the width direction of the support plate 3, one end of each clamping rod 43 is provided with a clamping assembly 44 for clamping the side edge of the non-woven fabric, the other end of each clamping rod is hinged with a connecting rod, and the connecting rod is connected with a roller 431. The supporting plate 3 is provided with a guide plate 33, the guide plate 33 is provided with a sliding groove 331 along the length direction thereof, and the roller 431 is positioned in the sliding groove 331. The guide plates 33 are straight outside the heating box 2 and arc inside the heating box 2, i.e., the distance between the two guide plates 33 is gradually reduced along the length of the support plate 3. When the sliding plate 4 drives the non-woven fabric to move, the roller 431 moves in the sliding groove 331 because the guide plate 33 is arc-shaped, so that the clamping rods 43 on the two mounting plates 42 can gradually approach each other, thereby gradually reducing the stretching of the clamping assembly 44 to the non-woven fabric.

Referring to fig. 4, the clamping assembly 44 includes a support block 441 disposed on the clamping rod 43 and an L-shaped mounting rod 442, a pressing rod 443 is screwed to the mounting rod 442, and a pressing block 444 cooperating with the support block 441 is disposed at an end of the pressing rod 443. When the non-woven fabric is clamped, the side edge of the non-woven fabric is stretched to the bearing block 441, and then the pressing rod 443 is rotated to enable the pressing block 444 to tightly press the non-woven fabric, so that the purpose of clamping the side edge of the non-woven fabric is achieved.

Referring to fig. 5 and 6, a plurality of heating plates 21 are installed on both the top plate and the bottom plate of the heating box 2 through hanger rods, and the plurality of heating plates 21 are symmetrically disposed to heat the non-woven fabric. The heating plate 21 is provided with a mounting port 211 and an air blowing port 212 communicated with the mounting port 211, the heating plate 21 is provided with a heating wire 213 positioned in the mounting port 211 and a first fan 214 positioned at the mounting port 211, the air is heated by the heating wire 213, and the heated air is blown to the non-woven fabric by the first fan 214, so that the purpose of heating the non-woven fabric is achieved. By setting different heating temperatures to the heating wires 213 of the plurality of heating plates 21, the temperature inside the heating box 2 assumes a gradually decreasing state.

Example 2

This example differs from example 1 only in that the temperature of the heating box was gradually decreased from 160 ℃ to 50 ℃ in the transport direction of the web.

Example 3

This example differs from example 1 only in that the temperature of the heating box was gradually reduced from 170 ℃ to 50 ℃ in the direction of transport of the web.

Example 4

This example differs from example 2 only in that the temperature of the heating box was gradually reduced from 160 ℃ to 55 ℃ in the direction of conveyance of the web.

Example 5

This example differs from example 2 only in that the temperature of the heating box was gradually decreased from 160 c to 60 c in the direction of conveyance of the web.

Example 6

This example differs from example 1 only in that the web is first stretched to a width increase of 35% of the original width, and then the web stretch is gradually reduced during transport until the web returns to its natural state.

Example 7

This example differs from example 1 only in that the web is first stretched to a width increase of 20% of the original width, and then the web stretch is gradually reduced during transport until the web returns to its natural state.

Example 8

This example differs from example 1 only in that the web is first stretched to a width increase of 50% of the original width, and then the web stretch is gradually reduced during transport until the web returns to its natural state.

Example 9

This example differs from example 1 only in that after the web has been conveyed out of the heating box 2, the temperature of the web is rapidly lowered to room temperature within 2min by means of the cooling box 5.

Referring to fig. 7, the cooling box 5 is disposed at one side of the heating box 2, a plurality of second fans 51 are uniformly distributed in the cooling box 5 along the conveying direction of the fiber web, and the fiber web is blown by the second fans 51, so that the purpose of rapidly cooling the fiber web can be achieved.

Example 10

The medical non-woven fabric is prepared by adopting the production process of the medical non-woven fabric with unidirectional elasticity in the example 1.

Comparative example

Comparative example 1

This comparative example differs from example 1 only in that, in step S5, the web is not stretched and is directly subjected to the heat-shrinking operation.

Comparative example 2

The comparative example differs from example 1 only in that in step S5 the web is uniaxially stretched and sent out of the heating box with a constant stretching force maintained.

Comparative example 3

The comparative example is different from example 1 only in that the temperature of the heating chamber is maintained at 150 ℃ in step S5, and the nonwoven fabric is discharged from the heating chamber and then naturally cooled to room temperature.

Performance test

The nonwoven fabric produced by the production process in each example and each comparative example was subjected to a tensile elastic recovery test using a CRE type tensile tester, specifically as follows: fixing two sides of the sample in the width direction in a holder, starting an instrument, slowly stretching the non-woven fabric until the width increase is 100% of the original width, stopping for 3 minutes, then taking down the non-woven fabric, flatly laying the non-woven fabric on a test bed, measuring the width of the non-woven fabric when the non-woven fabric is recovered to a natural state, and then calculating the stretching elastic recovery rate, wherein the stretching elastic recovery rate is not (the width in the natural state after stretching-the original width)/the original width is 100%. 10 samples were taken for each example and each comparative example and the results averaged.

The elastic recovery from stretching when the nonwoven fabric was slowly stretched to increase in width by 80%, 60%, 50%, 30% and 10% of the original width was measured in the above manner.

TABLE 1 tensile elastic recovery of the nonwoven in each of the examples and comparative examples

/>

Referring to table 1, compared with comparative example 1, the stretch elastic recovery rate of the nonwoven fabric in example 1 is significantly better than that of comparative example 1, which shows that the nonwoven fabric prepared by the production process disclosed by the application has excellent contractibility and good unidirectional elasticity; and the combination of the comparative example 2 and the comparative example 3 shows that the combination of gradually reducing the stretching force on the non-woven fabric and gradually reducing the temperature of the oven in the heat-shrinkable process of the non-woven fabric can be more beneficial to improving the contractility of the non-woven fabric, so that the non-woven fabric can obtain better one-way elasticity.

As can be seen from examples 1 to 5, the temperature of the heating chamber is set with reference to the temperature range disclosed in the present application, so that the nonwoven fabric can obtain more excellent shrinkability.

The combination of examples 1, 6 to 8, and examples 1 and 6 showed that the nonwoven fabric had better shrinkability, and that the nonwoven fabric could not have better shrinkability due to too low tension during heat shrinkage, but could be irreversibly deformed due to too high tension, and thus had lower shrinkability, indicating that the nonwoven fabric could have better shrinkability by stretching the nonwoven fabric in accordance with the scope disclosed herein.

With the combination of the embodiment 1 and the embodiment 9, compared with natural cooling, the non-woven fabric is rapidly cooled by blowing air, which is more favorable for the non-woven fabric to obtain better contractibility.

The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.

Claims

1. The production process of the medical non-woven fabric with the one-way elasticity is characterized by comprising the following steps of:

s1, melting raw materials:

s2, spinning;

s3, cooling and forming the spinning:

s4, preparing a fiber web;

s5, feeding the fiber web into an oven, simultaneously performing unidirectional stretching on two side edges of the fiber web, gradually contracting along the conveying direction of the fiber web, gradually reducing the temperature in the oven along the conveying direction of the fiber web, and naturally cooling to room temperature to obtain unidirectional elastic non-woven fabric; the highest temperature in the oven is 150-170 ℃, and the lowest temperature is 50-60 ℃;

in step S5, the fiber web is stretched to the width increment of 30-35% of the original width and then gradually contracted to a natural state.

2. The process for producing medical non-woven fabric with unidirectional elasticity according to claim 1, wherein the process comprises the following steps: the maximum temperature in the oven was 160 ℃ and the minimum temperature was 60 ℃.

3. The process for producing medical nonwoven fabric with unidirectional elasticity according to claim 1, wherein: and (4) cooling the non-woven fabric to room temperature within 2-4mim after the non-woven fabric is discharged from the oven.

4. The process for producing medical nonwoven fabric with unidirectional elasticity according to claim 1, wherein: the oven includes the support frame, be equipped with heating cabinet (2) on the support frame, be equipped with backup pad (3) of relative setting on the support frame, backup pad (3) run through heating cabinet (2), it is equipped with slide plate (4) to slide on backup pad (3), be equipped with mounting panel (42) on slide plate (4), it has a plurality of supporting rods (43) of slidable to run through on mounting panel (42), the one end of supporting rod (43) is equipped with centre gripping subassembly (44) that are used for centre gripping non-woven fabrics, and the other end ball articulates there is gyro wheel (431), be equipped with deflector (33) that are located slide plate (4) one side on backup pad (3), deflector (33) are opened and are supplied gyro wheel (431) gliding spout (331), two interval between spout (331) reduces along the length direction of backup pad (3) gradually.

5. The process for producing medical nonwoven fabric with unidirectional elasticity according to claim 4, wherein: be equipped with driving motor (41) on slide plate (4), install rotating gear (411) on the output shaft of driving motor (41), be equipped with rack plate (32) with rotating gear (411) meshing on backup pad (3).

6. The process for producing medical nonwoven fabric with unidirectional elasticity according to claim 4, wherein: the clamping assembly (44) comprises a bearing block (441) arranged on the clamping rod (43), an installation rod (442) is arranged on the clamping rod (43), the installation rod (442) is connected with a pressing rod (443) in a threaded mode, and a pressing block (444) is arranged on the pressing rod (443).

7. The process for producing medical nonwoven fabric with unidirectional elasticity according to claim 4, wherein: the support frame is provided with two threaded rods (12) and a power motor (13) connected to the threaded rods (12), the threaded rods (12) are provided with threads in opposite directions, and the threaded rods (12) penetrate through the two support plates (3) and are in threaded connection with the support plates (3).

8. Medical non-woven fabrics, its characterized in that: the medical non-woven fabric with the one-way elasticity is prepared by adopting the production process of any one of claims 1 to 7.