Do you know the bridge of the nose on the mask?Do you know the bridge of the nose on the mask?
This year, with the outbreak of the new crown epidemic, the production and sales of masks in China have increased substantially. Masks can prevent the spread of droplets and prevent the invasion of bacteria and viruses, and are an important means of protection. However, due to the protrusion of the nose, regardless of the thickness of the mask, the top of the mask cannot be completely sealed to the contour of the nose. If there is no bridge of the nose, outside air with bacteria and other harmful substances enters the nasal cavity through the large gaps on both sides of the nose bridge The effect will be greatly reduced, so the bridge of the nose plays the role of supporting the mask to fit the nose bridge.
The structure of the nose bridge needs to have bending and deformation with the action of external force, not rebound without loss of external force, maintain the existing shape with excellent performance, to prevent the glasses from forming moisture, and should have better comfort. The role in the use of masks is mainly to fit and shape the face of different people. Next, we will take a look at the "backbone" of the mask-the nose bridge from the commonly used materials, production processes and specifications of the nose bridge.
What are the commonly used materials for the nose bridge?
1. Metal aluminum strip
Made of metal aluminum sheet. The nose bridge made of this material has a good bending effect, but due to the large bending strength, it is easy to damage the human body, and it is difficult to separate and recycle the used mask after use.
The material of the aluminum nose bridge for masks is different from that of ordinary aluminum alloy products. This material has the advantages of anti-rust, anti-corrosion and high brightness; the surface of the aluminum strip has uniform penetration, good straightness, no deformation and stable size; , Good toughness, continuous bending with bending equipment; excellent adhesion with various types of glue; excellent sealing effect; not easy to leak, long service life, large demand. Commonly used: N95, N100, R95, P95, 9000, FFP2, FFP3 and other masks.
2. Galvanized thin iron wire covered with polyolefin polymer material
The nose bridge is coated with a layer of polyolefin polymer material on the galvanized thin iron wire with a diameter of 0.45mm-0.55mm. At present, most domestic mask factories use this type, with higher production capacity. This manufacturing principle is the same as wire and cable processing.
3. Full plastic nose bridge
This kind of nose bridge is mainly made of modified PE, PP and other materials after drying, stretching and cooling to shape, and then packaged into a roll by a traction machine. Among them, the toughness and ductility of PE material are more ideal. The all-plastic nose bridge has good hardness, impact resistance, and tensile resistance, and has good extrusion performance during the production process. The shrinkage after molding is small, and the dimensional stability is good.
What is the production process of the nose bridge?
1 aluminum metal strip
Production process: noodle electronic feeder-roller feeder-aluminum stamping machine-light material rack
2 coated galvanized fine iron wire
Production process: the material is dried by the dryer—extruded by the extruder—stretched—cooled and formed—the tractor is sent to the disc—wrap
3 Full plastic nose bridge
Production process: feeding-setting-traction-winding
What is the production standard of the nose bridge?
The performance of the nose bridge needs to meet the standards of mask production, that is, it needs to meet the standards of GB2626, GB19083, YY / T 0969, etc. It has strong plasticity and adjustability.
Common specifications of nose bridge
Nose bridge general specifications: 0.5 × 3mm, 0.5 × 4mm, 0.6 × 4mm, 0.5 × 5mm, 0.6 × 5mm, 0.8 × 3mm, 0.8 × 3.5mm, 0.8 × 3.8mm, special specifications can be customized.
In addition to meeting the specific requirements of mask production, the nose bridge also needs to consider the requirements of environmental protection. How to recycle the mask after use, how to separate it, and what is most beneficial to the environment, these must be fully considered.