CN113340745A - Method for detecting performance of nose clip for mask - Google Patents
Method for detecting performance of nose clip for mask Download PDFInfo
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- CN113340745A CN113340745A CN202110600723.5A CN202110600723A CN113340745A CN 113340745 A CN113340745 A CN 113340745A CN 202110600723 A CN202110600723 A CN 202110600723A CN 113340745 A CN113340745 A CN 113340745A
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- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000001514 detection method Methods 0.000 claims abstract description 38
- 239000004033 plastic Substances 0.000 claims abstract description 36
- 229920003023 plastic Polymers 0.000 claims abstract description 36
- 238000012360 testing method Methods 0.000 claims abstract description 33
- 238000005452 bending Methods 0.000 claims abstract description 22
- 230000007704 transition Effects 0.000 claims description 7
- 238000012545 processing Methods 0.000 claims description 2
- 239000003153 chemical reaction reagent Substances 0.000 abstract description 2
- -1 polypropylene Polymers 0.000 description 4
- 238000001914 filtration Methods 0.000 description 3
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- 229910001335 Galvanized steel Inorganic materials 0.000 description 1
- 241000700605 Viruses Species 0.000 description 1
- 244000052616 bacterial pathogen Species 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000008397 galvanized steel Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000002633 protecting effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/20—Investigating strength properties of solid materials by application of mechanical stress by applying steady bending forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/04—Chucks
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0676—Force, weight, load, energy, speed or acceleration
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a method for detecting the performance of a nose clip for a mask, which belongs to the field of detection of the nose clip for the mask, and comprises the following steps: A. preparing a sample; B. carrying out a plastic deformation test on a sample by using a detection device, wherein the detection device is used for fixing the A end of the sample, then the B end of the sample is bent for 180 degrees, the pressure is relieved, the rebound angle phi between the B end and the A end is measured, the measured rebound angle phi is used for converting the plastic deformation, the plastic deformation is the percentage value of the rebound angle and the bending angle, and the plastic deformation is less than or equal to 3%; C. carrying out repeated bending test on the sample after the plastic deformation test by using a detection device; D. and (6) judging the result. The invention can solve the problems that the detection of the nose clip in the prior art is verified through manual or reagent wearing, effective and reliable detection equipment and method are lacked, and the performance of the nose clip is not strictly judged.
Description
Technical Field
The invention relates to the field of detection of nose clips for masks, in particular to a performance detection method of a nose clip for a mask.
Background
The mask is a sanitary product for filtering air entering the mouth and the nose, can effectively filter harmful germs, dust, particles and the like in the air, is commonly used in hospitals, factories and other places, and is increasingly applied to daily trips of people along with increase of urban air haze and outbreak of virus epidemic situation of partial air transmission. The filtering and protecting effect of the mask mainly depends on the filtering capacity of the material of the mask, and the attaching effect of the mask attached to the face is very important. In order to ensure that the mask can be better attached to the outline of the human face, mask lines, namely nose bridge strips, nose clip lines and the like are arranged on the existing mask and used for attaching the mask to the human face.
The fit shaping performance of the mask nose clip line is very important for the protective effect of the mask, YY/T-0969-disposable medical mask and YY-0469-2004-medical surgical mask are required, the nose clip for the mask is required to be made of bendable and plastic materials in the two standards, the structure of the existing nose clip is generally composed of metal wires and a layer of plastic extruded on the plastic, the difference between the metal wires and the plastic affects the plasticity and the bending performance of the nose clip, the existing experimental method is manual bending and actual wearing verification, no specific performance parameter requirements exist, and the performance of the nose clip is not strictly judged.
Disclosure of Invention
The invention aims to provide a method for detecting the performance of a nose clip for a mask, and aims to solve the problems that in the prior art, the detection of the nose clip is verified through manual or reagent wearing, effective and reliable detection equipment and method are lacked, and the performance of the nose clip is not strictly judged.
In order to achieve the purpose, the basic technical scheme of the invention is as follows: a method for detecting the performance of a nose clip for a mask comprises the following steps:
A. preparing a sample;
B. carrying out a plastic deformation test on a sample by using a detection device, wherein the detection device is used for fixing the A end of the sample, then the B end of the sample is bent for 180 degrees, the pressure is relieved, the rebound angle phi between the B end and the A end is measured, the measured rebound angle phi is used for converting the plastic deformation, the plastic deformation is the percentage value of the rebound angle and the bending angle, and the plastic deformation is less than or equal to 3%;
C. carrying out repeated bending test on the sample after the plastic deformation test by using a detection device;
D. and (6) judging the result.
The scheme adopts the common low-carbon galvanized steel wire with the diameter of 0.8-1.2mm, which meets the requirements specified in YB/T-5294-2009-general-purpose low-carbon steel wire, and polypropylene and polyethylene are mixed according to a certain proportion to be used as the plastic of the nose clip. According to the scheme, a plastic deformation sample and a repeated bending test are designed for the performance detection of the nose clip, the elastic plasticity and the bending performance of the nose clip are respectively and effectively tested, a special detection device is designed, the rebound angle is tested after the sample is bent for 180 degrees, 3 percent is determined to be a qualified standard of the plastic deformation through repeated test verification, the elastic plasticity condition of the sample can be truly and accurately fed back, the actual service performance condition of the nose clip detected by adopting the scheme is proved to meet the technical requirements of YY/T-0969 plus 2012-disposable medical mask and YY-0469 plus 2004-medical surgical mask, the scheme can effectively and reliably detect and judge the performance of the nose clip, the detection and judgment process is rigorous, and the result is true and accurate.
Further, 5 specimens were cut out from a 2000mm sample of the nose clip line to be tested in step A, the length of each specimen was 100mm, and the specimens were subjected to a flattening treatment. The test sample obtained in the optimized way can meet the real use requirement of the nose clip on one hand, and can truly and accurately reflect the integral performance condition of the nose clip line sample on the other hand, and the test sample is uniformly straightened before the test, so that the accuracy and reliability of the subsequent test result are ensured.
And furthermore, the detection device in the step B comprises a lower clamping plate and an upper clamping plate, a clamping groove with the width larger than or equal to the width of the sample is processed on the upper clamping plate, the end A of the sample is clamped and fixed on the lower clamping plate by the upper clamping plate in the step B, and the end B of the sample is bent and then is in close contact with the upper clamping plate, and the sample does not have protrusion or depression. As the main body structure of the preferable upper clamping plate and the lower clamping plate as the detection device, the flat plate structure is adopted to be more stable, the clamping of the sample is more stable, the mode that one end of the sample is fixed and the other end of the sample is movably bent is adopted, the sample is kept in close contact with the upper clamping plate after being bent, and the simulation of the bending deformation process of the sample to the real use condition is ensured.
And further, recording the springback angle phi of each of 5 samples in the step B, and taking the middle value of the 5 times of plastic deformation as the plastic deformation of the sample. Preferably, the plastic deformation performance of the whole nose clip sample can be accurately and really fed back by measuring the rebound angles of 5 samples and then taking the intermediate value.
Further, in the step C, each sample tested in the step B is subjected to straightening treatment, then the sample is bent by 180 degrees on a detection device and unfolded to be in a straight state, the operation is repeated for 10 times for each sample, and the sample is judged to be qualified if the sample is not broken in the step D. Preferably, the sample after the plastic deformation test is straightened again, the accuracy and reliability of the subsequent deformation test of the sample are ensured, the sample is bent and deformed after being clamped again through the detection device, the bending times of the 0.8-1.2mm common low-carbon steel wire are more than or equal to 6 times according to the regulations in the YB/T5294-2009 standard, the bending performance is improved because the nose is clamped with the protection of polypropylene and polyethylene plastics, the sample is detected by matching with the detection device in the scheme, and the deformation performance of the sample can be fed back truly, accurately and reliably after 10 times of repeated bending.
Further, the end a of the sample is held stationary between the upper and lower plates of the detection apparatus in step C. As optimization, one end of the test sample is ensured to be stable in the detection process, so that the bending operation on the other end is stable and reliable, and the test result is accurate, real and reliable.
And further, in the step B, clamping grooves are processed on the upper surface and the lower surface of the upper clamping plate, and the edges of the upper clamping plate at the end parts of the clamping grooves are in arc transition. As the optimal clamping to the sample is stable and reliable, the upper clamping plate edge structure adopting circular arc transition can ensure that the surface of the sample is complete in the bending process, the damage of a detection device to the sample in the test process is avoided, and the real performance of the test feedback sample is ensured.
Further, the arc transition radius of the edge of the upper splint is 0.6 mm. The arc radius is preferably designed according to the size of the nose clip, so that the fitting detection device can be more compact in the test process of the test sample, and the deformation of the test sample can be more accurate in feeding back the elastoplasticity and the deformation performance.
Further, step B and step C are both carried out at an ambient temperature of 23 + -2 deg.C. It is preferable that the elastic-plastic property and the deformation property of the reaction sample can be more truly and accurately obtained at such an ambient temperature.
And furthermore, in the step B, the upper clamping plate is connected to the lower clamping plate through screws, the horizontal surface of the sample is upwards arranged on the lower clamping plate, the upper clamping plate is buckled on the lower clamping plate, the sample is embedded into the clamping groove, and the screws are screwed after the end of the sample A is compressed to enable the upper clamping plate to compress and fix the sample on the lower clamping plate. The clamping to the sample is stable and reliable as the optimization, the structure of the detection device is simple, the use and operation are simple and convenient, and the test to the sample is more convenient.
Drawings
FIG. 1 is a schematic diagram showing a test state of a sample in example 1 of the present invention;
fig. 2 is an isometric view of example 2 of the present invention.
Detailed Description
The following is further detailed by way of specific embodiments:
reference numerals in the drawings of the specification include: the device comprises a lower clamping plate 1, an upper clamping plate 2, a threaded hole 3, a sample 4, a clamping groove 5, an A end 6 and a B end 7.
Embodiment 1, a method for detecting the performance of a nose clip for a mask, comprising the steps of:
A. preparing samples 4, cutting 5 samples 4 from a 2000mm tested nose clip line sample, wherein the length of each sample 4 is 100mm, and straightening the samples 4;
B. the test specimen 4 was subjected to a plastic deformation test at an ambient temperature of 23 ± 2 ℃ using a test apparatus substantially as shown in figure 1: the detection device comprises a lower clamping plate 1 and an upper clamping plate 2, wherein a threaded hole 3 is processed on the upper clamping plate 2, the threaded hole 3 is correspondingly processed on the lower clamping plate 1, the upper clamping plate 2 is connected to the lower clamping plate 1 through a screw, clamping grooves 5 with the width larger than or equal to that of a sample 4 are processed on the upper surface and the lower surface of the upper clamping plate 2, the edges of the upper clamping plate 2 at the end parts of the clamping grooves 5 are in arc transition, and the radius of the arc transition is 0.6 mm; fixing an A end 6 of a sample 4 by using a detection device, placing the horizontal surface of the sample 4 on a lower clamp plate 1, covering an upper clamp plate 2 on the lower clamp plate 1, embedding the sample 4 into a clamp groove 5, tightly pressing the A end 6 of the sample 4, screwing a screw to enable the upper clamp plate 2 to tightly press and fix the sample 4 on the lower clamp plate 1, bending a B end 7 of the sample 4 by 180 degrees, tightly contacting the B end 7 of the sample 4 with the upper clamp plate 2 after bending, without protrusion or depression, then removing pressure, measuring a rebound angle phi between the B end 7 and the A end 6, converting the measured rebound angle phi into a plastic deformation amount, wherein the plastic deformation amount is a percentage ratio of the rebound angle to the bending angle, is less than or equal to 3%, recording the rebound angles phi for 5 samples 4 respectively, and taking the middle value of the 5 times of the plastic deformation amount as the plastic deformation amount of the sample;
C. performing repeated bending test on the sample 4 subjected to the plastic deformation test by using a detection device at the ambient temperature of 23 +/-2 ℃, straightening each sample 4 subjected to the test in the step B, keeping the A end 6 of each sample 4 fixed between the upper clamping plate 2 and the lower clamping plate 1 of the detection device, bending the sample 4 on the detection device by 180 degrees, unfolding the sample to be in a straight state, and repeating the operation for 10 times for each sample 4;
D. as a result, the sample 4 after the test of step C was judged as passed without breaking.
Embodiment 2, this embodiment provides the detection device in embodiment 1, as shown in fig. 2, including upper plate 2 and lower plate 1, the middle part of upper and lower both sides of upper plate 2 has been processed and has been pressed from both sides groove 5, and the width of pressing from both sides groove 5 is more than or equal to the width of nose clamp sample 4, and the edge rounding processing of upper plate 2 at the clamp groove tip, fillet radius 0.6 mm. Threaded holes 3 are processed in the upper clamping plates 2 on two sides of the clamping groove 5, the threaded holes 3 are correspondingly processed in the lower clamping plate 1, and the upper clamping plates 2 are detachably connected to the lower clamping plate 1 through screws.
The foregoing is merely an example of the present invention and common general knowledge in the art of specific structures and/or features of the invention has not been set forth herein in any way. It should be noted that, for those skilled in the art, without departing from the structure of the present invention, several changes and modifications can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.
Claims (10)
1. A method for detecting the performance of a nose clip for a mask is characterized by comprising the following steps: the method comprises the following steps:
A. preparing a sample;
B. carrying out a plastic deformation test on a sample by using a detection device, wherein the detection device is used for fixing the A end of the sample, then the B end of the sample is bent for 180 degrees, the pressure is relieved, the rebound angle phi between the B end and the A end is measured, the measured rebound angle phi is used for converting the plastic deformation, the plastic deformation is the percentage value of the rebound angle and the bending angle, and the plastic deformation is less than or equal to 3%;
C. carrying out repeated bending test on the sample after the plastic deformation test by using a detection device;
D. and (6) judging the result.
2. The method for detecting the performance of the nose clip for the mask according to claim 1, wherein: in the step A, 5 samples are cut from a 2000mm tested nose clip line sample, the length of each sample is 100mm, and the samples are subjected to straightening treatment.
3. The method for detecting the performance of the nose clip for the mask according to claim 2, wherein: the detection device in the step B comprises a lower clamping plate and an upper clamping plate, a clamping groove with the width larger than or equal to the width of the sample is processed on the upper clamping plate, the end A of the sample is clamped and fixed on the lower clamping plate by the upper clamping plate in the step B, and the end B of the sample is bent and then is in close contact with the upper clamping plate, and the sample does not have protrusion or depression.
4. The method for detecting the performance of the nose clip for a mask according to claim 3, wherein: and B, respectively recording the springback angles phi of the 5 samples in the step B, and taking the middle value of the 5 times of plastic deformation as the plastic deformation of the sample.
5. The method for detecting the performance of the nose clip for a mask according to claim 4, wherein: and C, straightening each sample tested in the step B, bending the sample on a detection device by 180 degrees, unfolding the sample into a straight state, repeating the operation for 10 times, and judging that the sample is qualified if the sample is not broken in the step D.
6. The method for detecting the performance of the nose clip for the mask according to claim 5, wherein: and C, keeping the A end of the sample fixed between an upper clamping plate and a lower clamping plate of the detection device.
7. The method for detecting the performance of the nose clip for the mask according to claim 6, wherein: and B, processing clamping grooves on the upper surface and the lower surface of the upper clamping plate in the step B, wherein the edges of the upper clamping plate at the end parts of the clamping grooves are in arc transition.
8. The method for detecting the performance of the nose clip for a mask according to claim 7, wherein: the arc transition radius of the edge of the upper splint is 0.6 mm.
9. The method for detecting the performance of the nose clip for a mask according to claim 8, wherein: and the step B and the step C are both carried out at the ambient temperature of 23 +/-2 ℃.
10. The method for detecting the performance of the nose clip for a mask according to claim 9, wherein: and in the step B, the upper clamping plate is connected to the lower clamping plate through screws, the horizontal plane of the sample is upwards arranged on the lower clamping plate, the upper clamping plate is buckled on the lower clamping plate, the sample is embedded into the clamping groove, and the screws are screwed after the end of the sample A is compressed to enable the upper clamping plate to compress and fix the sample on the lower clamping plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110600723.5A CN113340745A (en) | 2021-05-31 | 2021-05-31 | Method for detecting performance of nose clip for mask |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110600723.5A CN113340745A (en) | 2021-05-31 | 2021-05-31 | Method for detecting performance of nose clip for mask |
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| CN113340745A true CN113340745A (en) | 2021-09-03 |
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| CN202110600723.5A Pending CN113340745A (en) | 2021-05-31 | 2021-05-31 | Method for detecting performance of nose clip for mask |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113865791A (en) * | 2021-09-28 | 2021-12-31 | 江苏省纺织产品质量监督检验研究院 | Method for testing airtightness of mask nose clip |
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Cited By (2)
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| CN113865791A (en) * | 2021-09-28 | 2021-12-31 | 江苏省纺织产品质量监督检验研究院 | Method for testing airtightness of mask nose clip |
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Application publication date: 20210903 |