Detection method for plasticity of mask nose bridge strip

Abstract

The invention discloses a detection method for plasticity of a mask nose bridge strip, and belongs to the technical field of medical supplies. The detection method specifically comprises the following steps: clamping the nose bridge strip of the mask to form a certain clamping angle, loosening the clamping, measuring the angle change of the nose bridge strip in an optical projection mode, judging that the plasticity of the nose bridge strip of the mask is qualified when the angle change is less than 1 degree, and otherwise, judging that the plasticity is unqualified. By detecting the plasticity of the nose bridge strip, the quality of the nose bridge strip can be visually reflected, and then the protection performance of the mask is reflected.

Description

Technical Field

[0001] The invention belongs to the technical field of medical supplies, and in particular relates to a method for detecting the plasticity of a nose bridge strip of a mask. Background Art

[0002] The protective performance of masks is generally reflected by their filtration efficiency, so existing masks usually improve their protective performance by enhancing the filtration efficiency of the mask fabric. However, the protective performance of masks also includes items such as the tightness, protective effect, and leakage of the mask. The nose bridge affects the fit between the mask and the wearer's face, so the quality of the nose bridge has a direct impact on the tightness, protective effect, and leakage of the mask. Therefore, in addition to testing the filtration efficiency of the mask fabric, it is also necessary to test the plasticity of the mask nose bridge.

[0003] The nose bridge is the backbone of the mask. It is a hard strip inside the mask that supports the fit between the mask and the nose frame, ensuring that harmful substances from the outside world do not easily enter the respiratory tract. There are generally three types of nose bridges commonly used in masks: all-plastic nose bridges, aluminum nose bridges, and plastic-coated metal core nose bridges.

[0004] Many of the current domestic mask standards have regulations and requirements for nose bridge strips: GB 19083-2010 "Technical Requirements for Medical Protective Masks" requires that the nose clip should be adjustable; YY 0469-2011 "Medical Surgical Masks", YY / T 0969-2013 "Disposable Medical Masks" and GB / T 38880-2020 "Technical Specifications for Children's Masks" all require that the nose clip be made of plastic materials. Plasticity refers to bending and deformation under the action of external forces, and will not rebound after the external force is lost. It has the excellent performance of maintaining the existing shape unchanged. The nose bridge strip plays a role in fixing the nose bridge and ensuring the protective performance of the mask. The nose bridge strip with poor plasticity is easy to rebound after the mask is worn and pressed, and cannot fit the wearer's nose bridge, affecting the protective performance of the mask. However, there is currently no specific method to test the plasticity of the nose bridge strip. Summary of the invention

[0005] Technical problem to be solved: In response to the above technical problem, the present invention provides a method for detecting the plasticity of the nose bridge strip of a mask. By detecting the plasticity of the nose bridge strip, the quality of the nose bridge strip can be intuitively reflected, and then the protective performance of the mask can be reflected.

[0006] Technical solution: A method for detecting the plasticity of the nose bridge of a mask, specifically: clamping the nose bridge of the mask to form a certain clamping angle, releasing the clamping, and measuring the angle change by optical projection. When the angle change is less than 1°, the plasticity of the nose bridge of the mask is judged to be qualified, otherwise it is judged to be unqualified.

[0007] Preferably, when the clamping angle is 30°, 60°, 90° and 120°, and the angle change after loosening the clamp is less than 1°, the plasticity of the nose bridge of the mask is judged to be qualified, otherwise it is judged to be unqualified.

[0008] Preferably, the clamping angle is 30°.

[0009] Preferably, the method for measuring the angle change is specifically as follows: placing the nose bridge bar on an optical projector so that the engraved lines on the projection screen are aligned with the engraved lines on the zero-position indicator plate, and at this time, the cross lines of the projection screen are parallel to the X and Y coordinates of the workbench; placing the nose bridge bar on an appropriate position of the workbench, rotating the projection screen so that one of the cross lines on it coincides with one side of the nose bridge bar, and the angle of the digital display box is reset to zero; then rotating the projection screen and moving the workbench so that the other sides coincide, and at this time, the angle displayed on the digital display box is the angle after the nose bridge bar is clamped and released.

[0010] Beneficial effects: The plasticity of the nose bridge strip directly affects the mask's tightness, protective effect, leakage and other items that reflect the mask's protective performance. The present invention can intuitively reflect the plasticity of the nose bridge strip by detecting the change in the clamping angle of the nose bridge strip, thereby improving the quality of the mask's nose bridge strip, and improving the mask's quality and protective performance.

[0011] The invention provides a method for quickly and effectively detecting the plasticity of a nose bridge strip of a mask. DETAILED DESCRIPTION

[0012] The present invention will be further described below in conjunction with specific embodiments.

[0013] Example 1

[0014] A method for detecting the plasticity of the nose bridge of a mask, the process is as follows:

[0015] Use the clamps with angles of 30°, 60°, 90°, and 120° to clamp the nose bridge bar to form angles of 30°, 60°, 90°, and 120°. Release the clamp and place the nose bridge bar on the optical projector JT300, aligning the engraved lines on the projection screen with the engraved lines on the zero index plate. At this time, the crosshairs of the projection screen are parallel to the X and Y coordinates of the workbench.

[0016] Place the nose bridge bar on the appropriate part of the workbench, rotate the projection screen so that one of the crosshairs on it coincides with one side of the nose bridge bar, and reset the angle of the digital display box to zero; then rotate the projection screen and move the workbench so that the other side coincides. At this time, the angle displayed on the digital display box is the angle of the nose bridge bar after it is clamped and released.

[0017] The change in angle between the nose bridge strip when it is loosened and clamped reflects the plasticity of the nose bridge strip. At the same time, the protective effect of the mask with the corresponding nose bridge strip is tested according to Appendix B of GB / T32610-2016 "Technical Specifications for Daily Protective Masks".

[0018] The test results are as follows:

[0019] Full plastic nose bridge 1

[0020]

[0021] Full plastic nose bridge 2

[0022]

[0023] Full plastic nose bridge 3

[0024]

[0025] Full plastic nose bridge 4

[0026]

[0027] Full plastic nose bridge 5

[0028]

[0029] Aluminum nose bridge 1

[0030]

[0031] Aluminum nose bridge 2

[0032]

[0033] Aluminum nose bridge 3

[0034]

[0035] Aluminum nose bridge 4

[0036]

[0037] Aluminum nose bridge 5

[0038]

[0039] Plastic coated metal core nose bridge strip 1

[0040]

[0041] Plastic coated metal core nose bridge strip 2

[0042]

[0043] Plastic coated metal core nose bridge strip 3

[0044]

[0045] Plastic coated metal core nose bridge strip 4

[0046]

[0047]

[0048] Plastic coated metal core nose bridge strip 5

[0049]

[0050] From the above data, it can be seen that the angles of nose strips made of different materials change differently after the clamping is released. The angle of the plastic-coated metal core nose strip changes the least, followed by the aluminum nose strip, and the all-plastic nose strip changes the most. From this, it can also be judged that the order of the best plasticity is: plastic-coated metal core nose strip, aluminum nose strip, and all-plastic nose strip. At the same time, it is also verified that the plasticity of the nose strip has a greater impact on the protective effect of the mask. The better the plasticity of the nose strip, the better the protective effect of the mask. Improving the plasticity of the nose strip can effectively improve the protective effect of the mask. According to the GB / T 32610-2016 "Technical Specifications for Daily Protective Masks" standard, the lowest level D requires a protective effect of ≥65%. From the above test data, it can be seen that the protective effect of the mask using the aluminum nose strip 5 is 65.5%, which exceeds 65%. The protective effect of the mask using the plastic-coated metal core nose strip also exceeds 65%, and the angle after loosening the clamp is also <1°. Therefore, the limit adopted by the present invention for judging whether the plasticity of the nose bridge strip is qualified is: the change of the clamping angle must be less than 1°, which can effectively reflect the plasticity of the nose bridge strip of the mask.

Claims

1. A method for detecting the plasticity of a nose bridge of a mask, characterized in that: The detection method is as follows: clamping the nose bridge of the mask to form a certain clamping angle, releasing the clamping, and measuring the angle change by optical projection. When the angle change is less than 1°, the plasticity of the nose bridge of the mask is determined to be qualified, otherwise it is determined to be unqualified.

2. A method for detecting the plasticity of a nose bridge of a mask according to claim 1, characterized in that: When the clamping angles are 30°, 60°, 90° and 120°, and the angle changes after loosening the clamp are all less than 1°, the plasticity of the nose bridge of the mask is judged to be qualified, otherwise it is judged to be unqualified.

3. A method for detecting the plasticity of a nose bridge of a mask according to claim 1, characterized in that: The clamping angle is 30°.

4. A method for detecting the plasticity of a nose bridge of a mask according to claim 1, characterized in that: The method for measuring the angle change is specifically as follows: placing the nose bridge bar on the optical projector so that the engraved lines on the projection screen are aligned with the engraved lines on the zero-position indicator plate, and at this time the cross lines of the projection screen are parallel to the X and Y coordinates of the workbench; placing the nose bridge bar on an appropriate position of the workbench, rotating the projection screen so that one of the cross lines on it coincides with one side of the nose bridge bar, and the angle of the digital display box is reset to zero; then rotating the projection screen and moving the workbench so that the other side coincides, and at this time the angle displayed on the digital display box is the angle after the nose bridge bar is clamped and released.

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