JB/T 7547-1994 High-density polyethylene ultra-thin film blowing for packaging
Some standard content:
Machinery Industry Standard of the People's Republic of China
JB/T7547-94
High-density polyethylene for packaging
Ultra-thin film blow molding unit
Published on December 9, 1994
Ministry of Machinery Industry of the People's Republic of China
Implementation on October 1, 1995
Mechanical Industry Standard of the People's Republic of China
High-density polyethylene for packaging
Ultra-thin film blow molding unit
Subject content and scope of application
JB/T754794
This standard specifies the product classification, technical requirements, test methods, inspection rules and marking, packaging, transportation and storage of high-density polyethylene ultra-thin film blow molding units for packaging (hereinafter referred to as blow molding units). This standard applies to high-density polyethylene resin with a density of more than 0.941g/cm2, and blow molding units with a film thickness of less than 0.015mm blown by the tube film blow molding process. 2
Reference standards
Packaging storage and transportation graphic signs
GB/T13306 Signs
GB/T13384 General technical conditions for packaging of electromechanical products 3 Terms
3.1 Nominal specific power
The power of the extruder drive motor required to process 1kg of products per hour. 3.2 Specific flow
The production capacity per screw revolution, which characterizes the efficiency of the extruder in producing qualified products. 4 Product classification
Blow molding units are divided into: 100~350, 350~700, 500~1000mm according to the width of the film products. 4.1
The blow molding unit consists of a plastic extruder, blow molding film traction auxiliary machine, winding auxiliary machine, electrical control system and other parts. 4.2
The main performance and basic parameters of the blow molding unit shall comply with the provisions of Table 1. 4.3
Performance parameters
Film product specifications
Blow molding unit screw diameter
Product output Q
Specific flow
Nominal specific power
Film width deviation
Film thickness and deviation
Film plasticizing quality
(kg/h)/(r/min)
kW/(kg/h)
Approved by the Ministry of Machinery Industry on December 9, 1994
100~350
0.01±0.003||t t||Film product width
350700
0.01±0.0035
500~1000
0.01±0.004
Good plasticization, obvious "water pattern" and "cloud" are allowed65
0.01±0.004
1995-10-01 implementation
5 Technical requirements
JB/T7547-94
5.1 Products shall comply with the provisions of this standard and be manufactured according to drawings and technical documents approved by the prescribed procedures. 5.2 Parts and outsourced parts shall be inspected and qualified according to product drawings, and purchased parts shall be inspected and qualified by the factory quality inspection department before assembly. 5.3 Each part of the blow molding unit shall have necessary protective devices in terms of mechanical transmission, electricity and heat to ensure the safety of operators and production. 5.4 Technical requirements for main parts
5.4.1 Screw
5.4.1.1 Material: 38CrMoA1A, other alloy structural steels such as 42CrMo, 40Cr, etc., and wear-resistant alloys added (spraying, surfacing) on the threads.
5.4.1.2 Surface treatment: 38CrMoAlA needs to be nitrided, with a nitriding depth of 0.3 to 0.6mm. The outer surface hardness of the screw is 700 to 940HV, and the brittleness is not greater than level 2. Other steels can also be plated with hard chrome. 5.4.2 Barrel
5.4.2.1 Material: 38CrMoAIA, other alloy structural steels or wear-resistant alloy bushings added to the inner hole can also be used. 5.4.2.2 Inner hole surface treatment: 38CrMoAIA needs to be nitrided, with a nitriding depth of 0.4 to 0.7 mm, a hardness of 940 HV or more, and a brittleness of no more than level 2.
5.5 The surface of the outer mold, mold core and the flow channel through which the plastic melt flows should be hard chrome plated or nitrided. 5.6 Appearance quality
5.6.1 The surface of the blow molding unit should not have obvious protrusions, depressions, roughness or damage not specified in the drawing. 5.6.2 Each control device should have a clear mark and be fixed in a clear position. 5.7 Assembly quality
5.7.1 The clearance between the screw and the cylinder should be uniform on the circumference, and the diameter clearance should comply with the requirements of the drawing. 5.7.2 When placed horizontally, the cylinder and the screw are allowed to contact in the cylinder, but when running after adding lubricating oil, the screw and the barrel shall not be stuck or scratched.
5.7.3 The direction of rotation of the screw should be correct.
5.7.4 The flow channel of the die head should have a smooth transition, and its contact surface should be well connected without leakage. 5.7.5 The air inlet of the die head and the air and water pipelines should be unobstructed, well sealed, and no leakage is allowed. 5.7.6
The parallelism error of the compression rubber roll, guide roll and winding roll to the traction roll should not exceed 2mm/m. 5.7.7 The tangent error between the symmetric center plane of the herringbone plate and the outer circle generatrix of the traction roller should not exceed 3mm. The axis of the die head should be consistent with the traction center, and the error should not exceed 5mm. 5.7.8
Each clamping roll, guide roller, fan, and air compressor should operate normally and turn correctly. 5.7.10
The winding mechanism should operate in a coordinated and reliable manner.
Each air intake, water supply, and lubrication system should work normally without leakage. The connection surfaces of each fastening part should fit well and without looseness. The parts of the product that should be oiled and not easy to operate should be lubricated with lubricating oil (grease) or anti-rust oil during the assembly process. The electrical components should be intact, the markings of the electrical components in the electric control box should be consistent with the drawings, and the ends of all wires should be covered with sleeves with corresponding symbols specified in the drawings.
The wiring in the electric control box should be neat, the wires of the slot board wiring should be neatly bundled, and the wires outside the box should be neatly fixed on the machine body. 5.7.15th
The resistance between the grounding terminal and any exposed conductor part of the electrical equipment shall not exceed 0.2α. The insulation resistance between the short-circuited power circuit and the protection circuit (including the base) wires shall not be less than 1MQ. The temperature of each bearing shell shall not exceed 70℃, and the temperature rise shall not exceed 35℃. The noise of the whole machine shall not exceed 85dB(A).
The temperature rise of the oil in the transmission box shall not exceed 35℃.
6 Test methods
6.1 Idle running test
JB/T7547-94
After the unit is assembled and qualified, the extruder shall be tested for low speed idling for no less than 3 minutes, and the auxiliary machine transmission system shall be tested for idling for no less than 30 minutes. The idling test of the air supply and water supply system shall be no less than 10 minutes. The requirements of 5.7.2~5.7.12 and 5.7.16~5.7.17 shall be met during the test.
6.2 Load running test
6.2.1 Test conditions
6.2.1.1 Raw materials: 0.941g/cm high-density polyethylene (MI0.05) film-blowing grade resin. 6.2.1.2 Maximum width (folded diameter) of the product. 6.2.1.3 The blow molding unit shall achieve the output of qualified products. 6.2.2 Test requirements
After the idle operation test is qualified, the load operation test shall be carried out. During the test, the parameters shall be checked to meet the requirements of Table 1 and 5.7.2, 5.7.4, 5.7.11 and 5.7.19.
6.3 Product output Q (kg/h)
Under the normal load operation of the unit, the qualified product output of the blow molding unit shall be measured for 15 minutes continuously, and its value shall not be lower than that specified in Table 1. 6.4 Specific flow rate 9
Under the conditions of Article 6.3, use a speed measuring device with an accuracy resolution of 0.1r/min and a range of 0 to 9999r/min to measure the actual screw speed n (r/min), and then calculate it according to formula (1): = Q/n..
6.5 Nominal specific power N
Under the conditions of Article 6.3, use a three-phase power meter to measure the extruder motor power N (kW), and calculate it according to formula (2): N = N/Q.. .
6.6 Film width and deviation
...(1)
·(2)
Under the conditions in 6.3, cut a sample film with a length of 2m, use a tape measure or steel ruler with an accuracy of 1mm to measure 3 locations at equal intervals, record the maximum and minimum values, and calculate the deviation.
6.7 Film thickness and deviation
Under the conditions in 6.3, cut a sample film with a length of 200mm, use a tape measure or steel ruler with an accuracy of 0.001mm thickness gauge, measure along the circumference of the sample, measure every 20mm for circumferences below 500mm, and every 40mm for circumferences above 500mm, record the maximum and minimum values, and calculate the deviation.
6.8 Plasticization qualitywwW.bzxz.Net
Observe with the naked eye under light transmission conditions.
6.9 Nitriding depth, hardness and brittleness of screws and cylinders shall be inspected according to the furnace samples. 6.10 Noise
Test 6 points with a type 1 sound level meter at 1m away from the machine and 1.5m high according to Figure 1, and take the average value. 3
7 Inspection rules
7.1 Factory inspection
JB/T7547-94
Extruder
Electrical protective screen
7.1.1 Each blow molding unit must be inspected and qualified by the quality inspection department of the manufacturer and accompanied by a product certificate before it can be shipped. 7.1.2 The test items are the product output, film width and deviation, film thickness and deviation, film plasticizing quality and technical requirements 5.6, 5.7.2~5.7.5, 5.7.9~5.7.12, 5.7.20 in Table 1. 7.2 Type inspection
Type inspection shall be carried out for blow molding units in any of the following situations: trial production and identification of new products or old products for transfer to factory production; after formal production, if there are major changes in structure, materials, and processes, which may affect product performance; during normal production, inspection shall be carried out once a year; when the product is resumed after long-term suspension; when the factory inspection results are significantly different from the last type inspection; when the national quality supervision agency proposes a requirement for type inspection. Type inspection test items shall include all the contents in the technical requirements of this standard. Type inspection sampling shall be drawn at 10% of the batch, but shall not be less than 1 unit. Marking, packaging, transportation, storage
Each blow molding unit shall be fixed with a product label in a conspicuous position. The product label shall comply with the provisions of GB/T13306 and indicate the following contents a.
Product model and name;
Main technical parameters;
Manufacturing date and factory number;
Manufacturer name.
8.2 Each blow molding unit shall be packed in a box when leaving the factory. The box shall be firm and reliable and comply with the provisions of GB/T13384. The markings on the box surface shall comply with the provisions of GB191. 8.3
Product instruction manual, product inspection certificate and packing list are provided randomly. b. Spare parts, accessories and random tools.
JB/T7547-94
8.4 The blow molding unit shall not vibrate violently during transportation, and collision is strictly prohibited during loading and unloading. 8.5 The blow molding unit shall be stored in a dry and ventilated place. Under normal storage conditions, the manufacturer guarantees that the product and spare parts, accessories and random tools will not rust within half a year from the date of leaving the factory, and anti-rust treatment shall be performed again if necessary. 9
Quality Warranty Period
If the user complies with the installation and use rules of the product, within 18 months from the date of delivery and within 12 months from the date of installation, if the product cannot work properly due to poor manufacturing quality, the manufacturer shall repair or replace it for the user free of charge (except for wearing parts). Additional Notes:
This standard was proposed and coordinated by the Hefei General Machinery Research Institute of the Ministry of Machinery Industry. This standard was drafted by the Hefei General Machinery Research Institute and Shantou Machine Tool Factory. The main drafters of this standard are Chen Guoping, Wu Ruiping, and Luo Qingchao. 5
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