Anti-static safety regulations for chemical fiber production

In the first chemical fiber production process, equipment (such as yarn guides, rollers and other parts) and chemical fiber or chemical fiber contact friction, and when compressed, stretched, or even dried in the air, there will be charging phenomenon. . Most of the chemical fiber raw materials and semi-finished products have a resistivity of more than 1×109 Ω·m, and the static charge generated is not easily leaked, and the accumulation of static electricity is easily formed. This regulation does not apply to the anti-static of liquids, powders, etc. in the production of chemical fiber.
The second hazard of chemical fiber static electricity

1. When there is a potential difference between the human body and other objects, the electric shock will cause mental stress and other phenomena, and may cause a secondary accident.

2. Rejection and attraction caused by static electricity, even if the electrostatic potential is not high (such as several hundred volts), it will cause the fiber to spread, increase the flying flower, wrap the pressure roller and roller, etc., increase the breakage, resulting in abnormal production.

3. After the chemical fiber is electrostatically charged, it is easy to adsorb dust and the like, which affects the quality of the chemical fiber.

4. In the production of non-woven fabrics (such as carpets), when the fiber is opened, the pressed fibers are subjected to various impacts, and the static charges are generated by friction, so that the loose fibers are attached to the frames, pipes, etc. to cause fibers. Uneven thickness, affecting the unevenness of the product.

5. Static electricity makes the packaging of the fiber not tight, affecting storage and increasing transportation costs.

6. Due to the influence of static electricity, a large amount of chemical fiber dust is flying, causing pollution to the production environment.

Article 3 Any procedures, equipment or places with electrostatic hazards shall adopt corresponding anti-static safety measures to control the electrostatic potential of the insulator below the recommended allowable value:

1 For the place where the electric insulator is prevented from causing electric shock to the operator, the electrostatic potential of the insulator should be controlled below 10kV.

2. When static electricity strikes the operator, it may cause a secondary accident. Except that the electrostatic potential of the insulator should be controlled below 10kV, corresponding safety measures should be taken for the equipment or device.

Article 4: Chemical fiber production adopts measures to increase the relative humidity of the surrounding environment of hydrophilic insulating materials to prevent static electricity accumulation. The relative humidity of the surrounding environment of the electrified body is controlled to be more than 60% without affecting the quality of the product.

Article 5 The role of antistatic oil: Some antistatic oils can ionize in water and increase their conductivity. Most antistatic oils can increase hygroscopicity.

1. Antistatic oil requirements: After the antistatic oil agent is added, the fiber properties cannot be deteriorated, and there is no corrosive effect on the machine equipment, which can not cause pollution of the production environment and human health. The performance of the antistatic agent should be stable and the effect is remarkable.

2. Selection and addition amount of antistatic oil agent: According to product variety, specification and holding requirements, processing conditions, and equipment requirements according to post-processing, select the appropriate antistatic oil agent and oil agent to make the product reach The resistance value specified by the quality standard, if the standard is not specified, the resistivity of the product should be less than 1 × 109 Ω·m.

3. Antistatic oil adding method: chemical fiber semi-finished product or after one or more uniform spraying, impregnation or adding before fiber forming.

Article 6 uses a static eliminator or ionizes the air around the charged body to eliminate the static charge accumulated on the material being processed.

1. Principle of static eliminator selection: The static eliminator should be selected according to the level of the electrostatic potential of the object, the elimination requirements, the operating characteristics, and the properties of the medium.

2. Types of static eliminators: inductive static eliminators, high voltage corona discharge static eliminators, ion current static eliminators, and radioisotope static eliminators.

3. Selection of installation position of static eliminator: easy to process operation, good static elimination effect, relative to the maximum potential of the charged body, close to the charged body, avoiding the metal background.

Article 7 When selecting materials for machine parts, consideration should be given to using electrostatic sequences to generate opposite charges to neutralize them, thereby eliminating or reducing static electricity.

1. When the chemical fiber is drawn, the rubber coating of the drafting device should be a conductive rubber.

2. Polyethylene staple fiber conveyor belt should use conductive rubber products or static elimination measures.

3. For the doffing of polyester filaments and cotton filaments after drawing, use a paper tube or a plastic cylinder that conducts static electricity. Do not use plastic tubes with good insulation and untreated.

Article 8 Electrostatic grounding is used to cause static charges generated on the object to leak to the earth, thereby limiting the potential rise of the electrostatically charged object or limiting the resulting electrostatic discharge.

1. Requirements for electrostatic grounding

(1) The connection and contact of each conductor using electrostatic grounding should be firm and reliable to ensure the integrity of the electrical path;

(2) The resistance value of the electrostatic grounding system shall comply with the regulations;

(3) For the resistance value of the electrostatic grounding system, it should be tested once a year, and the measurement data file should be established. If the resistance value of the system under test does not meet the requirements, it should be repaired immediately;

(4) For metal conductors, the grounding resistance value of the direct grounding should be measured; for other objects, the leakage resistance value should be measured; for the part with jumper, the resistance value of the jumper should be measured;

(5) During the production process, partial inspection of equipment, etc., will cause temporary grounding in advance when the electrostatic connection loop of the relevant object is broken. After repair, it should be restored in time and retest the resistance value.

2. Range of electrostatic grounding

(1) The production device will generate static electricity that will endanger the production and cause the human body to be subjected to electrostatic shock, and can be grounded to eliminate static electricity;

(2) When the metal conductor on the production device is likely to generate static electricity and is charged, regardless of its size, it should be electrostatically grounded;

(3) When a conductor having a conductivity of 1 × 10 -8 S/m or more and an object having a surface specific resistance of 1 × 109 Ω or less are likely to generate static electricity or electrification, a metal conductor to be tightly bonded thereto should be attached to the object. , indirect grounding.

3. No need to be grounded by static electricity

(1) When a metal conductor that requires electrostatic grounding has been connected to a lightning protection or a protective grounding system that prevents electrical equipment from leaking;

(2) The surface of the object having a non-conductor and a surface specific resistance of 1 × 10 11 Ω or more;

(3) A part of the metal conductor is buried in the ground or when there is a jumper between the building and the metal such as the buried steel structure.

4. Grounding resistance value

(1) The total leakage resistance of the electrostatic ground connection system should not exceed 1×106Ω, and the resistance value of the grounding body should not exceed 100Ω;

(2) When the electrostatic grounding is shared with other grounding, the grounding resistance value should be determined according to the grounding requirements of other purposes.

The practice and requirements for electrostatic grounding are carried out in accordance with the relevant regulations.

Article 9 The safety management of anti-static hazards involves equipment, electrical, process, quality, production and other departments. The directly affiliated enterprises shall clarify their management responsibilities according to the actual conditions of the unit, and the safety supervision and management department shall be responsible for supervision and inspection.

Article 10 The personnel involved in the relevant work shall have knowledge of electrostatic safety technology and preventive measures for electrostatic hazard, and be familiar with the production process and equipment operating status. When it is found that the electrostatic potential exceeds the recommended allowable value or the specific resistance of the fiber product exceeds the required value, and it may cause an electrostatic accident and cause a decline in product quality indicators, it has the right to stop production and report to the leader to take effective preventive measures as soon as possible.

Article 11 All anti-static equipment, devices and protective equipment shall be designated by special personnel to be inspected and repaired regularly and filled out with registration cards.

Article 12 The relevant technical department shall appoint a special person to carry out regular inspections on the parts that are prone to static electricity, static eliminators and static grounding conditions in the various processes of chemical fiber production, and timely organize and report the test results.

1. Fiber belt static performance prediction project: fiber specific resistance test has fiber mass ratio resistance measurement, fiber volume ratio resistance measurement, fiber leakage resistance measurement.

2. In the actual production process, the static electricity detection item has the measurement of the electrostatic potential of the charged body (the electrostatic potential meter can be used with a non-contact static electricity meter, the maximum range is 100kV, and can be measured by binning, the accuracy is 5.0, using the instructions according to the instrument) Measurement of ambient temperature and relative temperature, and measurement of operating speed of charged body.

3. The purpose of static electricity detection: analyze the degree of damage, study preventive measures, and judge the elimination effect.

4. Classification of static electricity detection items: When using new raw materials, the charging performance of the objects is predicted; in the actual production process, the static state of the fibers is detected; and the electrostatic safety measures are judged and tested.