What are the specific requirements for the workshop environment when installing POY spinning testing machine?

The installation of POY (pre-oriented yarn) spinning testing machine has strict requirements on the workshop environment to ensure the stable operation of the equipment and the spinning process accuracy. The following are specific environmental requirements and key points:

I. Temperature and humidity control

1. Temperature

Scope: The workshop temperature should be kept at 20 2℃ (it can be fine-tuned according to the process).

Influence: Temperature fluctuation will change the viscosity of polymer melt, leading to unstable spinning or abnormal fiber properties (such as decreased breaking strength).

Measures: Equipped with constant temperature air conditioning system to avoid the equipment being close to heat sources (such as heating devices, doors and windows).

2. Humidity

Range: relative humidity is controlled at 50%~65% RH.

Influence: Too high humidity can easily make raw materials (such as polyester chips) absorb moisture and affect spinning quality; If the humidity is too low, the risk of static electricity will increase, leading to hairiness and broken ends.

Measures: Use dehumidifier/humidifier to adjust, and lay antistatic materials on the ground.

Second, the cleanliness requirements

1. Air cleanliness

Standard: It is recommended to reach the standard of 10,000-class clean room (the number of dust particles with particle size ≥0.5μm ≤ 352,000/m).

Influence: Dust may block the spinneret hole, pollute the melt or entangle the roller, resulting in spinning breakage or fiber defects.

Measures:

The workshop is sealed, and the entrance is provided with a shower room or a shoe changing area;

Clean equipment and ground regularly and use vacuum cleaner (to avoid dust);

The raw material storage area is isolated from the processing area.

2. No corrosive gas

Requirements: Keep away from corrosive gas sources such as acid, alkali and sulfide (such as chemical storage area).

Influence: Corrosive gas will corrode the metal parts of equipment (such as spinning box and metering pump), which will affect the precision and life.

Measures: Keep the workshop well ventilated and isolated from the process that produces corrosive gas.

Third, space and layout

1. Installation space

Distance: the distance between the equipment and the wall and adjacent equipment is ≥ 1.5m, which is convenient for operation and maintenance; A space of ≥ 2m is reserved above the spinning box for easy disassembly of the spinneret assembly.

Bearing capacity of the ground: the ground should be firm and flat, with a bearing capacity of ≥ 500 kg/m (cement concrete or steel structure platform is recommended), so as to avoid vibration affecting the spinning stability.

2. Pipeline layout

Electrical: independent power supply line, equipped with voltage regulator or UPS to prevent voltage fluctuation (voltage deviation ≤ 10%);

Pneumatic: the compressed air pipeline should be dry and clean, and the air pressure should be stable (0.4~0.6MPa). A filter device should be installed to remove oil and water impurities.

Material pipeline: the melt conveying pipeline shall be insulated (temperature error ≤ 1℃) to avoid solidification or degradation of the melt.

Fourth, ventilation and exhaust

1. Local ventilation

An exhaust device is arranged above the spinning box to exhaust oligomers, volatiles (such as acetaldehyde) and heat in time, and the exhaust air volume should meet the air exchange times of ≥15 times/hour.

The exhaust pipe should be corrosion resistant, and the outlet should be far away from the fresh air inlet to avoid polluting the circulating air.

2. Overall ventilation

The workshop maintains a slight negative pressure (to prevent dust from overflowing), and fresh air system is adopted to introduce filtered clean air to ensure the health of operators and the heat dissipation of equipment.

Five, anti-static and grounding

1. Anti-static measures

Anti-static materials (such as conductive rubber) are used on the ground and equipment surface, and the grounding resistance is ≤ 10Ω;

Operators should wear anti-static work clothes and gloves to avoid electrostatic interference with filament forming or potential safety hazards (such as dust explosion).

2. Equipment grounding

Electrical system and metal frame shall be reliably grounded (grounding resistance ≤4Ω) to prevent leakage and electromagnetic interference, and ensure the stable operation of control systems (such as sensors and frequency converters).

Vi. Vibration and Noise Control

1. Vibration control

Keep away from vibration sources (such as stamping equipment and large motors). When installing the equipment, use damping pads or vibration isolation devices, and the vibration amplitude shall be ≤ 0.1 mm/s..

Vibration may lead to the displacement of spinning assembly, the decrease of precision of metering pump or the yarn jitter, which will affect the fiber uniformity.

2. Noise control

The operating noise of the equipment is less than or equal to ≤85dB. If it exceeds the noise, it is necessary to install a sound insulation cover or wall to protect the hearing of the operators.

Seven, lighting requirements

The light intensity in the operation area is ≥300lux, and anti-glare lighting is adopted, which is convenient for observing the spinning state (such as yarn thickness and broken ends) and equipment operation parameters.

summary

The installation environment of POY spinning testing machine needs to comprehensively consider factors such as temperature and humidity, cleanliness, spatial layout, ventilation and anti-static, etc. It is suggested to work out an environmental plan in cooperation with equipment suppliers, and conduct environmental parameter testing (such as dust particle number, temperature and humidity, grounding resistance) after installation to ensure that it meets the technical requirements and process standards of the equipment.