CN111317197A

CN111317197A - Preparation method and application of recyclable filtering structure suitable for breathing

Info

Publication number: CN111317197A
Application number: CN202010148274.0A
Authority: CN
Inventors: 贝史伟; 贝闻涛; 顾亚琴
Original assignee: Shanghai Juchen Baby Clothing Co ltd
Current assignee: Shanghai Juchen Baby Clothing Co ltd
Priority date: 2020-03-05
Filing date: 2020-03-05
Publication date: 2020-06-23

Abstract

The invention provides a preparation method and application of a recyclable filtering structure suitable for breathing, wherein the preparation method of the filtering structure comprises the following steps: s1, firstly, paving the voile layer, the PTFE filter membrane layer and the voile layer in sequence; and S2, and fixing the edge of the whole filter structure. The invention adopts the preparation process of firstly layering and then fixing the edges, solves the problem that the PTFE membrane is easy to be adsorbed by static electricity to generate displacement during processing, and obtains the filtering structure which can be recycled and is suitable for breathing. The filtering performance of the mask or the mask cushion prepared from the mask or the mask cushion on fine particles with the diameter of 75nm exceeds 95 percent and reaches the standard of a KN95 mask. And the protective effect is still maintained above 95% after the composition is generally used for 10-20 times under different use strengths through boiling water, 84 disinfection and alcohol wiping. The mask or mask cushion can maintain the filtering performance for 200 hours under the conditions of normal wearing and no damage of the film.

Description

Preparation method and application of recyclable filtering structure suitable for breathing

Technical Field

The invention relates to the technical field of masks, in particular to a preparation method and application of a recyclable filtering structure suitable for breathing.

Background

When the epidemic situation is suddenly coming, the public focuses on health safety measures in different occasions, and the mask pad are used as the most important personal protective articles in the novel coronavirus pneumonia situations such as NCP, SARS and the like, and the demand of the mask and the mask pad is increased rapidly. This places a great deal of stress on manufacturers of masks and mask cushions, especially the raw materials of mask bodies are often in short supply.

Conventional masks include fabric masks, gauze masks, activated carbon masks, non-woven fabric masks, melt-blown fabric masks, and the like. Wherein, the particulate matter filter effect of fabric gauze mask, gauze mask is lower, and more focus is on prevent wind and protect the nose skin. The activated carbon mask needs activated carbon to manufacture a filter valve, and the manufacturing difficulty is high. For example, patent document CN206027248U discloses a high-efficiency filtration meltblown, but when the supply of raw materials for meltblown is limited, the meltblown mask cannot be produced.

Therefore, there is a need for improved structures for new mask materials.

Disclosure of Invention

In view of the drawbacks of the prior art, it is an object of the present invention to provide a method for manufacturing a filter structure suitable for breathing that can be recycled and its use.

The purpose of the invention is realized by the following technical scheme:

the invention provides a preparation method of a filtering structure suitable for breathing, which comprises the following steps:

s1, firstly, paving the voile layer, the PTFE filter membrane layer and the voile layer in sequence;

s2, and then fixing the edges of the entire filter structure, thereby obtaining the filter structure.

Preferably, the fixing method is fixing by using sewing threads, and the distance between the sewing threads and the edge of the filter structure is 0.3-0.5 cm. The edges of the whole filtering structure are fixed, so that the PTFE filtering membrane layer can not be displaced in the subsequent processing process, and the smoothness of the PTFE filtering membrane layer is ensured.

Preferably, the voile count used in the preparation of the voile layer is: 60-100 of radial yarn count and 60-100 of transverse yarn count; the density adopted is 70-110 of warp density and 70-110 of weft density.

More preferably, the voile count used in the preparation of the voile layer is: 60-80 parts of radial yarn count and 60-80 parts of transverse yarn count; the density adopted is 80-100 of warp density and 80-100 of weft density. For example, the yarn count may be 60/60, 65/65, 70/70, 75/75, 80/80, 60/70, 60/75, 60/80, 70/80 or 75/80 (radial/transverse yarn count), and the density may be 80/80, 85/85, 90/90, 95/95, 100/100, 80/85, 80/90, 80/95, 80/100, 90/80, 90/85, 90/95, 90/98, 90/100, 95/80, 95/85, 95/90 or 95/100 (warp/weft density), but is not limited thereto.

Preferably, the PTFE filter membrane layer used in step S1 is coated with a non-woven fabric layer on both sides. The PTFE filter membrane layer has strong electrostatic adsorption, and can be used as an intermediate layer together with the non-woven fabric layers attached to the two sides when the filter structure is prepared, so that the spreadability of the PTFE filter membrane is ensured, the phenomena of wrinkling and the like of the single PTFE filter membrane are prevented, and the smooth operation of the working procedure is ensured.

The invention also provides a filtering structure suitable for breathing prepared by the method, which comprises a layer A, a layer B and a layer C, wherein the layer A, the layer B and the layer C are overlapped from outside to inside to form a ventilating breathing passage of a three-dimensional space;

the two sides of the layer A comprise an outer side and an inner side facing the layer B, and the two sides of the layer B comprise an outer side facing the layer A and an inner side facing the layer C; the two sides of the layer C comprise an inner side and an outer side facing the layer B;

the layer B is a PTFE filter membrane layer;

the layer A and the layer C are voile layers;

the outer surface of the layer A is an environment exposed surface, and the outer surface of the layer C is a human body opposite surface;

the filter structure also comprises a D layer and an E layer; the D layer is positioned between the A layer and the B layer, and the E layer is positioned between the B layer and the C layer;

and the D layer and the E layer are both non-woven fabric layers.

Preferably, a nose pad is arranged in the middle of the filtering structure. The nose pad comprises a bending part, wherein the bending part is convex in front and forms an accommodating space at the rear;

the size of the accommodating space is matched with the nose of the wearer;

the nose pad supports the mask or the mask pad, so that the phenomenon that the mask or the mask pad touches, is attached to or covers nostrils is avoided when a wearer breathes.

In a preferred embodiment, the bending part or the whole nose support is made of a material which is easy to bend and shape, and a wearer can adjust the front and back positions of the bending part of the nose support and/or adjust the shapes of the bending part, such as the bending degree and the like according to the size of the nose;

the bent part can be a strip, the cross section can be circular, or a flat strip structure is adopted, the outline adopts the design of a round corner and a round edge, the scratch or the puncture of the mask or the mask cushion is avoided, in some preferred embodiments, before the mask or the mask cushion is washed, the nose support can be pulled out and separated from the mask or the mask cushion, the nose support is inserted and installed after the washing, and the process can avoid the puncture and the damage of the mask or the mask cushion through the round corner and the round edge.

The invention also provides a preparation method of the mask, which comprises the following steps:

A. preparing a filter structure according to the method of claim 1;

B. pleating the knife holes on the filtering structure, and then folding the pleating positions at the upper opening and the lower opening of the filtering structure according to the positions of the pleating knife holes to form pleating;

C. adopting double-light single-needle edge rolling to the pleats of the upper opening and the lower opening to form an edge rolling strip, and forming an edge rolling cavity in the edge rolling strip;

D. a nose bridge strip penetrates into the binding cavity of the upper opening;

E. adopting double-light single-needle edge rolling to form edge rolling strips on the left edge and the right edge;

F. and packaging positioning structures of the ear belts at the left end and the right end of the filtering structure to obtain the mask.

Preferably, in step B, the depth of the tuck knife eye is not more than 0.3 cm;

the width of the upper opening and the lower opening is 1.0-1.5cm, or the width of the upper opening is 1.8-2.2cm, and the width of the lower opening is 1.5-1.8 cm;

in the steps C and E, the width of the binding strip is 0.5-0.8 cm.

Preferably, step B further comprises forming a plurality of second pleats in the middle of the filtering structure, parallel to the pleat positions of the upper and lower openings; the width of the second pleats is 1.0-1.5cm, and the spacing between the plurality of second pleats is 1.2-1.8 cm.

The invention also provides a mask prepared according to the method. The ear of the mask is provided with an adjusting buckle, and the tightness can be adjusted according to the shape of the face.

The invention also provides a mask pad which comprises the filtering structure.

Compared with the prior art, the invention has the following beneficial effects:

the invention adopts a preparation process of firstly layering and then fixing the edges, solves the problem that the PTFE membrane is easy to be adsorbed by static electricity to generate displacement during processing, and obtains a filtering structure which can be recycled and is suitable for breathing. The mask or the mask cushion prepared by the filtering structure has high air permeability and impermeability, and the filtering performance of the filtering structure to fine particles with the diameter of 75nm exceeds 95 percent and reaches the standard of a KN95 mask. The mask or mask pad is boiled in boiling water, disinfected by 84 times and wiped by alcohol, and the protective effect is still maintained at more than 95% under different use strengths after the mask or mask pad is generally used for 10 to 20 times. The mask or mask cushion can maintain the filtering performance for 200 hours under the conditions of normal wearing and no damage of the film. When the mask is worn for 8 hours in a day, the mask can be at least equal to 20 common disposable masks. Therefore, compared with a disposable mask, the amount of waste generated by the mask is 1/20, and auxiliary materials such as ear bands, nose clips and the like for preparing the mask are only 1/20, so that the mask saves a large amount of resources and energy consumption and has important significance for environmental protection. The mask or the mask cushion is used by the ordinary people, but the key indexes of the mask or the mask cushion meet the requirements of medical masks, so that the mask or the mask cushion is safer and more reliable to use.

Drawings

Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:

FIG. 1 is a schematic view of a filter structure according to example 1 of the present invention;

FIG. 2 is a schematic view of a filter structure according to example 2 of the present invention;

FIG. 3 is a schematic diagram of filtration in the filter structure according to example 2 of the present invention;

FIG. 4 is a schematic front view of the mask according to example 3 or 5 of the present invention;

FIG. 5 is a schematic view showing the rear structure of the mask according to example 5 of the present invention;

FIG. 6 is an enlarged cross-sectional view of the mask of example 5 of the present invention;

FIG. 7 is an enlarged view of the structure A in FIG. 6;

wherein, 1-a filtration structure; 11-A layer, 12-C layer; 13-D layer; 14-E layer; 2-opening; 3-B layer; 4-hidden button; 5-ear band; 6-nose clip.

Detailed Description

The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All falling within the scope of the present invention.

Example 1

A filtering structure suitable for breathing comprises an A layer 11, a B layer 3 and a C layer 12, wherein the A layer 11, the B layer 3 and the C layer 12 are overlapped from outside to inside to form a breathable breathing channel of a three-dimensional space;

the two sides of the A layer 11 comprise an outer side and an inner side facing the B layer 3, and the two sides of the B layer 3 comprise an outer side facing the A layer 11 and an inner side facing the C layer 12; the two sides of the C layer 12 comprise an inner side and an outer side facing the B layer 3;

the A layer 11 and the C layer 12 are all voile layers, and the voile count adopted during preparation of the voile layers is as follows: 60-80 parts of radial yarn count and 60-80 parts of transverse yarn count; the density adopted is 80-100 of warp density and 80-100 of weft density.

The B layer 3 is a middle filter layer, in particular a PTFE filter membrane layer.

The outer surface of the A layer 11 is an environment exposed surface, and the outer surface of the C layer 12 is a human body facing surface.

The preparation method of the filter structure comprises the following steps:

The fixing method is characterized in that sewing threads are adopted for fixing, and the distance between the sewing threads and the edge of the filtering structure is 0.4 cm.

Example 2

A filtering structure suitable for breathing is shown in figures 2 and 3 and comprises an A layer 11, a B layer 3 and a C layer 12, wherein the A layer 11, the B layer 3 and the C layer 12 are overlapped from outside to inside to form a breathable breathing passage of a three-dimensional space; the composite material further comprises a D layer 13 and an E layer 14, wherein the D layer 13 is positioned between the A layer 11 and the B layer 3, and the E layer 14 is positioned between the B layer 3 and the C layer 12;

The D layer 13 and the E layer 14 are both nonwoven fabric layers.

The preparation method of the filter structure comprises the following steps:

And a non-woven fabric layer is attached to two sides of the PTFE filter membrane layer adopted in the step S1.

Example 3

A reusable mask comprises a filter structure 1 shown in embodiment 1, and ear bands 5 provided at both ends of the filter structure, the ear bands being made of elastic cloth.

The preparation method of the mask comprises the following steps:

A. preparing a filter structure according to the method described in example 1;

D. a nose bridge strip penetrates into the edge rolling cavity of the upper opening to form a nose clip 6;

In the step B, the depth of the pleat knife eye is not more than 0.3 cm;

the width of the upper opening and the lower opening is 1.1cm, or the width of the upper opening is 2cm, and the width of the lower opening is 1.7 cm;

in the steps C and E, the width of the binding strip is 0.7 cm.

Example 4

A reusable mask comprising the filter structure shown in example 2 and ear bands provided at both ends of the filter structure, the ear bands being made of elastic cloth.

The preparation method of the mask comprises the following steps:

A. preparing a filter structure according to the method described in example 1;

In the step B, the depth of the pleat knife eye is not more than 0.3 cm;

in the steps C and E, the width of the binding strip is 0.7 cm.

The mask prepared by the embodiment has high air permeability and impermeability, and the filtering performance of the mask to fine particles with the diameter of 75nm exceeds 95 percent, thereby reaching the standard of KN95 mask. The mask can be worn normally, and the filtering performance can be maintained for 200 hours under the condition that the film is not damaged. After the mask prepared by the embodiment is boiled in boiling water, disinfected by 84 and wiped by alcohol, the protective effect is still maintained to be more than 95% under different use strengths after the mask is generally used for 10-20 times.

Example 5

A recyclable mask has the same overall structure as that of the mask in example 4, except that: and a plurality of second folds are formed in the middle of the filtering structure, and the second folds are parallel to the folding positions of the upper opening and the lower opening. The preparation method differs from that in example 3 only in that: the width of the second pleats is 1.1cm, and the pitch between the plurality of second pleats is 1.5 cm.

The mask prepared by the embodiment has high air permeability and impermeability, and the filtering performance of the mask to fine particles with the diameter of 75nm exceeds 95 percent, thereby reaching the standard of KN95 mask. The mask can be worn normally, and the filtering performance can be maintained for 200 hours under the condition that the film is not damaged. After the mask prepared by the embodiment is boiled in boiling water, disinfected by 84 and wiped by alcohol, the protective effect is still maintained to be more than 95% under different use strengths after the mask is generally used for 10-20 times. Therefore, the mask prepared by the invention has the characteristic of recycling.

Example 6

A method of manufacturing a reusable mask, substantially the same as that of example 4, except that: in step B, the gather width of the upper port is 2cm, and the gather width of the lower port is 1.7 cm.

Example 7

This embodiment is a variation of embodiment 3, and is different from the variations shown in fig. 4 to 7 in that: in this implementation, 1 both ends of filtration leave opening 2 and link up, layer B both ends are equipped with spacing hole, layer A11 and layer C12 are provided with correspondingly and are equipped with the hidden discount 4 with the spacing hole complex of layer B3, can make layer B3 insert or take out at any time from this. The layer B3 can thus be removed at any time for sterilization, so that the remaining filter structure can be cleaned without damaging the PTFE filter of the layer B3.

Example 8

A mask pad comprising the filter structure of example 1. The mask cushion prepared by the embodiment can be recycled.

The invention has many applications, and the above description is only a preferred embodiment of the invention. It should be noted that the above examples are only for illustrating the present invention, and are not intended to limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications can be made without departing from the principles of the invention and these modifications are to be considered within the scope of the invention.

Claims

1. A method of making a filtration structure suitable for breathing, comprising the steps of:

2. A method of making a filter structure suitable for breathing as claimed in claim 1 wherein the fixing is by sewing with a thread which is spaced from the edges of the filter structure by a distance of 0.3 to 0.5 cm.

3. The method of making a filtration structure suitable for breathing in accordance with claim 1, wherein the voile layer is made with a voile count of: 60-100 of radial yarn count and 60-100 of transverse yarn count; the density adopted is 70-110 of warp density and 70-110 of weft density.

4. The method of claim 1, wherein the PTFE filter membrane layer used in step S1 is coated with a non-woven fabric layer on both sides.

5. A filter structure suitable for breathing prepared according to the method of any one of claims 1 to 4, comprising a layer A, a layer B and a layer C, wherein the layer A, the layer B and the layer C are overlapped from outside to inside to form a ventilation breathing passage of a three-dimensional space;

the layer B is a PTFE filter membrane layer;

the layer A and the layer C are voile layers;

and the D layer and the E layer are both non-woven fabric layers.

6. The preparation method of the mask is characterized by comprising the following steps:

A. preparing a filter structure according to the method of claim 1;

D. a nose bridge strip penetrates into the binding cavity of the upper opening;

7. The mask preparation method according to claim 6, wherein in step B, the depth of the pleat holes is not more than 0.3 cm;

in the steps C and E, the width of the binding strip is 0.5-0.8 cm.

8. The mask preparation method according to claim 6, wherein the step B further comprises forming a plurality of second pleats in the middle of the filtering structure, parallel to the pleat positions of the upper and lower openings; the width of the second pleats is 1.0-1.5cm, and the spacing between the plurality of second pleats is 1.2-1.8 cm.

9. A mask made according to the method of claim 6.

10. A mask pad comprising the filter structure of claim 5.