Discussion on cleanliness of steel drum painting workshop
Discussion on cleanliness of steel drum painting workshop Text / Yang Wenliang At present, high-cleaning barrels have become the normal demand of many high-end users of steel drums. Under the circumstances of increasing user requirements, some barrel-making enterprises have begun to transform the production workshop to meet the production requirements of high-clean barrels. The most critical process for producing high-cleaning drums is in the latter stage, because even the front section is not clean enough during production, and can be cleaned cleanly in the post-coating pre-treatment process. Therefore, the cleanliness of the steel drum painting workshop is the key environment to ensure the production of high cleaning barrels. First, what is cleanliness? Cleanliness refers to the number of particles and the amount of particles contained in the air per unit volume, which is the standard for distinguishing the cleanliness of space. Painting cleanliness refers to the air cleanliness (dust content) of the entire paint shop. In fact, the paint shop has included the cleanliness of the surface of the steel drum, the degree of water pollution in the cleaning process, the drying and cleanliness of the air supply and compressed air, the cleanliness of the paint and various raw and auxiliary materials, etc. Manage projects to avoid secondary pollution from pollution sources. A clean room (zone) is a room (area) that requires control of dust particles and microbial content. According to the requirements of the production process, the clean area should be divided into a highly clean area and a general clean area. The number of microbes and the number of dust particles in the clean room (zone) need to be regularly monitored and recorded. Second, the cleanliness standard 1. International Standard (ISO14644) The air cleanliness standard is a limit indicator of the concentration of particles having a certain particle size per 1 m3 of air. The international clean room standard ISO14644 has nine levels of ISO1~9 (see ISO14644-1 below): Maximum concentration limit (number of particles, one / m3) 5μm particles, one / 2.83L Approximate to the traditional level 0.1μm 0.2μm 0.3μm 0.5μm 1.0μm 5.0μm ISO1 level 10 2 ISO2 level 100 twenty four 10 4 ISO3 level 1000 237 102 35 8 Level 1 ISO4 level 10000 2370 1020 352 83 Level 10 ISO5 level 100000 23700 10200 3520 832 29 Level 100 ISO6 level 1000000 237000 102000 35200 8320 293 Level 1000 ISO7 level 352000 83200 2930 8.2919 10000 level ISO8 level 3520000 832000 29300 82.919 100000 level ISO9 level 35200000 8320000 293000 829.19 2. Chinese Standard (GB/T16292-1996) Maximum allowable dust / cubic meter Maximum allowable number of microorganisms ≥0.5μm 0.5μm Floating bacteria / cubic meters Settling bacteria/dish Level 100 3500 0 5 1 10000 level 350000 2000 100 3 100000 level 3500000 20000 500 10 300000 level 10500000 60000 - 15 3. Standards applicable to the barrel industry: For different areas of the steel drum painting workshop, the barrel company should use the cleanliness shown in the following table as the standard: name geographic range Dust particle content limit (number / 2.83L) Frequency of inspection ISO14644 1 to 5 μm 5~10μm >10μm Times/week grade 1 High clean area Spray booth, leveling area, drying oven, paint booth <50000 0 to 10 ≤1 1 ISO7 level 2 Clean area Pretreatment line, air cooling area, upper cover area, marking area <50000 10~100 ≤10 1 ISO7 level 3 General clean area Conveyor track, workshop office, personnel passage, workshop bathroom - - ≤100 1 ISO8 level 4 Other area Warehouse, etc. - - ≤100 1 ISO8 level At present, the cleanliness of the high clean area of ​​the paint shop of the barrel enterprise is controlled above the IS07 level. Third, perceptually understand the particle size General particle size comparison: Fourth, the control of the cleanliness of the steel drum painting workshop 1. Daily monitoring: monitoring and testing of airborne particulate content in the workshop environment According to the standard of cleanliness of the barrel industry, it can be divided into four areas (high clean area, clean area, general clean area, other areas). There is a quantitative data standard for the dust content of each area. In order to achieve the above grades, the dust content of the air in each part of the workshop can be measured regularly with a dust meter. 2, daily monitoring: workshop ventilation environment monitoring The wind balance of the painting workshop must meet the process requirements, and the spray booth and the workshop must ensure a slight positive pressure. The rest of the area can maintain a normal pressure state. The ventilation environment of the workshop requires regular monitoring and statistics. Serial number Test items Theoretical value Frequency of detection Test method description 1 Wind speed Spraying area: 0.45~0.5m/s 1 time / week Place the probe of the anemometer at a height of 1 m from the grille, and uniformly detect 4 to 10 points in each zone. 2 wind direction Design by court 1 time / week Suspend the 20cm long tape in each section and check the direction of the tape 3 Positive and negative pressure Micro-positive pressure 1 time / day Suspend the 20cm long tape on the spray booth door, open the spray booth door, and check the direction of the tape 3, daily monitoring: cleanliness control environment (sub-regional) (1) High cleanliness area: ◎When a person enters the paint cleaning room, it must blow ≥10s in the air shower room. Non-regional personnel need to wear a disposable shoe cover when entering the clean room; ◎The operator must wear a one-time coverall when entering the spray booth, and change the one-time one-piece suit one day; ◎ Drying furnace process maintenance, maintenance should be carried out during the shutdown period according to the workshop process requirements; ◎The doors and windows of the paint booth should be kept closed every day, and the doors and windows should not be opened at will. When accepting the paint, first close the inner door and then open the outer door. After the paint has entered the workshop, close the outer door, then open the inner door and carry the paint. It is forbidden to open the inner and outer doors at the same time; ◎ In addition to the relevant staff in and out of the paint booth, other personnel are prohibited from entering; ◎ Before entering the workshop, the chemicals on the surface of the packaging drum must be lightly rubbed to ensure that they are clean before entering the workshop; (2) Clean area: ◎ Pre-treatment raw materials are placed on the surface without dust, and the ground is kept clean; ◎In and out of the UBS spray booth, need to replace the labor insurance shoes; (3) General clean areas and other areas: ◎The original auxiliary materials enter the workshop to check the cleanliness of the outer surface, so as to prevent dust from entering the workshop with the auxiliary materials; ◎It is necessary to clean the equipment, tooling and conveying device according to the cycle; ◎The factory and painting room should ensure micro positive pressure; ◎It is necessary to clean the tools such as process equipment and spraying tools regularly to ensure that the tools are cleaned of dust and debris.
Protect the page material white transparent, can clearly see the content of the paper.Suitable for office and school students to protect the paper inside from damage.Sheet protection page price is very cheap, bulk purchase price is better.
We have 32 holes, 30 holes, 26 holes, 23 holes, 20 holes, 11 holes, 3 holes and other specifications of the protection page, size A4, A5, B5 and other sizes.
Plastic Sheet Protectors,Sheet Protectors,Pvc Green Bag,Single Archive File Bag shaoxing chaofeng stationery manufacturing CO.,LTD. , https://www.chaofengstationery.com
Leveling area: 0.2~0.3m/s 