Compressed air and requirements in the production process of washing and protecting daily chemicals

In the production process of washing and protecting daily chemicals, compressed air is mainly used to drive pneumatic equipment, stir raw materials, transport materials and product packaging. In order to ensure product quality and production safety, compressed air needs to meet cleanliness, dryness, oil content, microbial control and no odor and other core requirements, as follows:

core Requirements for 1. Compressed Air

1. cleanliness
   • solid particulate matter: The compressed air shall not contain dust, rust, wear particles and other impurities, so as not to pollute the product or block the pipeline.
   • Standard according to ISO 8573-1, the grade of solid particles is usually ≤ 2 (particle size ≤ 0.5 μm, quantity ≤ 100,000/m & sup3;), and some high-precision processes may require ≤ 1.
2. dryness
   • moisture control: Moisture can cause pipeline corrosion, valve sticking, and even affect product stability (e. g. emulsion delamination, powder agglomeration).
   • Standard the pressure dew point temperature should be 5-10 ℃ lower than the minimum ambient temperature, usually ≤-20 ℃(ISO 8573-1 grade 3 or higher), to ensure that no condensed water is generated during the transmission of compressed air.
3. Oil content
   • oil pollution hazard: Lubricating oil or oil vapor can contaminate products (such as shampoo, shower gel), cause deterioration or produce peculiar smell, and even cause consumer allergies.
   • Standard: Total oil content (including liquid oil, oil mist and oil vapor) must be ≤ 0.01 mg/m & sup3;(ISO 8573-1 Class 1), some processes may require less.
4. microbial control
   • bacterial contamination: Microorganisms (such as bacteria and molds) in compressed air can contaminate products, shorten shelf life, and even endanger consumer health.
   • Standard: Need to pass through high-efficiency filter (such as 0.01μm accuracy) and sterilization filter to ensure that the microbial content is ≤ 1CFU/m & sup3;(refer to the pharmaceutical industry standard).
5. No odor
   • odor pollution: Odors in compressed air (e. g. lubricating oil odor, pipe rust odor) will be transferred to the product and affect the consumer experience.
   • Standard: need through activated carbon filtration or catalytic oxidation technology to remove odor, to ensure that the compressed air is colorless and tasteless.

Configuration and Maintenance of 2. Compressed Air System

1. purification equipment selection
   • filter: Adopt multi-stage filtration system, including primary filter (to remove large particles), high-efficiency filter (to remove small particles) and oil removal filter (to remove oil vapor).
   • Dryer according to the dew point requirements, select the freeze dryer (pressure dew point ≥ 3 ℃) or adsorption dryer (pressure dew point ≤-40 ℃), and the high-precision process needs to be used in combination.
   • sterilization filter: Install sterilization filters in key process links (such as filling) to ensure that microorganisms meet the standards.
2. Regular maintenance and inspection
   • filter Element Replacement: Replace the filter element according to the differential pressure indication or regular schedule to prevent clogging or filter failure.
   • Dryer maintenance: Clean the condenser, check the drainage system, and ensure the activity of the adsorbent (such as molecular sieve).
   • Oil-water separator: Regular drainage to prevent oil and impurities from entering the downstream equipment.
   • online monitoring: Install dew point meter, oil content detector and particle counter to monitor compressed air quality in real time.
3. Piping and Tightness
   • material Selection stainless steel or food grade plastic pipes are used to avoid corrosion and chemical precipitation.
   • Tightness check: Regularly check the pipeline connection and equipment interface to prevent external pollutants from entering.

3. industry case and standard reference

• food & Beverage Industry: Compressed air shall conform to ISO 8573-1 Level 2 (solid particles ≤ 1μm, dew point ≤ 3 ℃, oil content ≤ 1 mg/m & sup3;), but the daily chemical industry has stricter requirements (e.g. oil content ≤ 0.01 mg/m & sup3;).
• Pharmaceutical Industry: GMP standard requires that when compressed air directly contacts drugs, solid particles ≤ 0.1 μm, dew point ≤-40 ℃, oil content ≤ 0.01 mg/m & sup3;, microorganism ≤ 1CFU/m & sup3;, the daily chemical industry can refer to this standard.
• Electronic industry: Compressed air needs to prevent static electricity and pollution, solid particles ≤ 0.1 μm, dew point ≤-70 ℃, oil content ≤ 0.01 mg/m & sup3;, some processes in the daily chemical industry (such as precision filling) can be used for reference.