GB/T 47556-2026Packaging machinery - Technical specification for the carbon emission reduction of PET bottles - Low pressure blowing systems (English PDF)

4.1 Composition and Basic Parameters

4.1.1 Composition The components of a low-pressure blow molding system for PET bottles include.

a) Bottle preform;

b) Blow molding die;

c) Blow molding machines and their auxiliary equipment.

4.1.2 Basic Parameters The names and units of the basic parameters of the PET bottle low-pressure blow molding system are as follows:

a) Blow-blowing pressure. The unit is megapascals (MPa);

b) Mass of the preform. in grams (g);

c) Linear dimensions of the preform. in millimeters (mm);

d) Dimensions of blow molding die. in millimeters (mm);

e) Operating temperature of blow molding die. in degrees Celsius (°C);

f) Rated production capacity of blow molding machine. unit is bottles per hour (bottles/h);

g) Number of blow molding stations for bottle blowing machines. in units.

4.2 Working Conditions

4.2.1 The work area should be free from external airflow and heat radiation that could affect the blow molding quality, and the air cleanliness should meet the requirements of Table

3.0.1 of GB 50073-2013. The regulations for Level N5 in China.

4.2.2 The operating ambient temperature is 15°C~35°C, with a fluctuation range of ±3°C; the relative humidity should not exceed 85%, and the altitude should not exceed 1000m.

4.2.3 The deviation between the external power supply voltage and the rated voltage shall comply with the provisions of

4.3 in GB/T 12325-2008.

4.2.4 The requirements for compressed air are as follows:

a) The compressed air supply pressure of the pneumatic system shall be 0.7MPa~1.0MPa, and the quality of the compressed air shall comply with GB/T 13277.1- The standard grades specified in 2023 are as follows: particulate matter grade not lower than grade 4, moisture and liquid water grade not lower than grade 4, and total oil content grade not lower than grade 4. No lower than level 2;

b) The compressed air supply pressure of the low-pressure blow molding system should meet the requirements of the blow molding machine for producing finished bottles, and the pressure fluctuation value should be less than [value missing]. The compressed air quality should meet the standard grade specified in GB/T 13277.1-2023, with a particle size not lower than

0.08 MPa. Level 1, with humidity and liquid water levels no lower than Level 4, and total oil content no lower than Level 1.

4.2.5 Cooling water requirements are as follows:

a) Temperature, pressure, and flow rate should meet the operating requirements of the blow molding machine;

b) pH value is 7~8;

c) Total hardness (as CaCO3) is less than 140 mg/L;

d) The size of the pollutant particles is no greater than

5.2 Preform Technical Requirements

5.2.1 Preform quality deviation The quality deviation of the preform should meet the requirements of Table 2.

5.2.2 Preform wall thickness difference The wall thickness difference of the preform should meet the requirements of Table 3.

5.2.3 Preform wall thickness deviation The deviation of the preform wall thickness should meet the requirements of Table 4.

5.2.4 Preform Verticality Deviation The verticality deviation of the preform should meet the requirements of Table 5.

5.2.5 Ovality of the preform The ellipticity of the preform should not exceed

0.25 mm.

5.2.6 Preform moisture content The moisture content of preforms for hot-fill beverage bottles should not exceed 0.2%, and the moisture content of preforms for non-hot-fill beverage bottles should not exceed 0.3%.

5.2.7 Other requirements for preforms Other requirements for preforms should comply with BB/T 0060.

5.3 Design and Performance Requirements of Blow Molding Dies

5.3.1 The molding surface texture of the blow molding die cavity should be smoothly transitioned.

5.3.2 Venting holes and/or venting grooves should be designed at the reinforcing rib positions of blow molding dies.

5.3.3 The ratio of the maximum spacing (D1) at the bottom of the groove to the maximum spacing (D2) at the top of the groove in the reinforcing rib section of the blow molding die cavity should be greater than [missing value]. 0.9, its location is shown in Figure 1.

5.3.4 The reinforcing ribs of the blow molding die cavity have a trapezoidal cross section, and the included angle (alpha) between the two sides of the trapezoid should be greater than 75°. The position is shown in Figure 2.

5.3.5 The radius of the top fillet (alphat) of the reinforcing ribs on the molding surface of the blow molding die should not be less than

0.3 mm, and the radius of the bottom fillet (alphab) should not be less than... It is

2.0 mm, and its location is shown in Figure 3.

5.3.6 The ratio of the center depth (H1) of the bottom mold of the blow molding die to the maximum diameter (D3) of the bottom mold should not be greater than 0.2, and its position is shown in Figure 4.

5.3.7 The ratio of the concave depth to the line width of the text on the bottom mold of the blow molding die should be greater than 1.3, and the ratio of the convex depth to the line width should be less than 0.75.

5.3.8 The working temperature deviation between the symmetrical positions of the left and right half mold surfaces of the hot-fill beverage bottle blow molding die should not exceed 1.0°C. The working temperature deviation between the symmetrical positions of the left and right halves of the blow molding die for beverage bottles should not exceed 1.5°C.

5.3.9 Other requirements for blow molding dies shall comply with the requirements of GB/T 38461.

5.4 Design and Performance Requirements of Blow Molding Machine

5.4.1 The blowing pressure at each blow molding station on the blow molding machine should be consistent, with a pre-blow pressure deviation of ±0.01MPa and a main blow pressure deviation of... It is ±0.08MPa.

5.4.2 The blow molding machine for carbonated beverage bottles shall be equipped with an external cooling device and/or an internal cooling device for cooling the bottom of the carbonated beverage bottle.

5.4.3 Other requirements for blow molding machines shall comply with GB/T 29648.

5.5 Technical Requirements for PET Bottles PET bottles shall comply with the provisions of GB/T 41167 or the requirements of the purchaser.

5.6 Energy Conservation and Emission Reduction Requirements The total power consumption of a low-pressure blow molding system should be lower than that of a general blow molding system.

6.3 Preform Test

6.3.1 Preform Quality Deviation Test Weigh the sample using an electronic balance with an accuracy of not less than 0.01g, and calculate the difference between the weighed value and the design value.

6.3.2 Preform Wall Thickness Difference Test Using a thickness measuring instrument with an accuracy of not less than

0.01 mm, measure the outer circle of the section 3 mm from the bottom parting line of the preform towards the bottle mouth. Measure and calculate the difference between the maximum and minimum values.

6.3.3 Preform Wall Thickness Deviation Test The preform wall thickness includes the preform body wall thickness and the preform bottom wall thickness. The test method for its wall thickness deviation is as follows:

a) Preform wall thickness. Using a thickness gauge with an accuracy of not less than

0.01 mm, measure the thickness at a point 3 mm from the bottom parting line towards the bottle mouth. The outer circle of the cross-section is measured, and the maximum and minimum values are recorded. The differences between the maximum and minimum values and the design values are calculated respectively.

b) Preform bottom wall thickness. Use a thickness gauge with an accuracy of not less than

0.01 mm to measure around the bottom gate of the preform and record the maximum value. Calculate the difference between the maximum and minimum values and the design value, respectively.

6.3.4 Preform Verticality Deviation Test

6.3.4.1 Test Instruments The verticality deviation tester is shown in Figure 5, with an accuracy of not less than 0.02mm.

6.3.4.2 Test Procedure Take a preform and place it in a perpendicularity deviation tester. Fix the preform opening to the preform opening fixture. Deviate from the parting line at the bottom of the preform towards the bottle opening. At 3mm, rotate one revolution and record the maximum and minimum values of the measuring table with probe. Calculate the perpendicularity deviation according to formula (1).

6.3.5 Preform Ovality Test Using a dimensional measuring instrument with an accuracy of not less than

0.01 mm, measure the parting line of the preform at a point 3 mm off from the bottom of the preform, between the preform opening and the parting line of the preform body. The diameter has 6 directions less. The difference between the maximum and minimum values is calculated according to formula (2).

6.3.6 Preform Moisture Content Test Take 6 preforms, and cut 3g-10g of the preform body from each preform into small pieces, each piece weighing 0.5g-1.0g, according to GB/T 14190-2017. The moisture content of the preform shall be calculated in accordance with the provisions of 5.7.1.

6.3.7 Other requirements for preform testing Check other requirements for the preform according to BB/T 0060.

6.4 Blow Molding Die Test

6.4.1 Test on the forming surface of the blow molding die cavity Visually or by touch inspect the molding surface of the blow molding die cavity.

6.4.2 Test of venting structure of blow molding die Visually inspect the reinforcing ribs of the blow molding die for vent holes and/or vent grooves.

6.4.3 Test on the ratio of the bottom to the top of the groove in the reinforcing rib section of the blow molding die cavity Using a dimensional measuring instrument with an accuracy of not less than

0.01 mm, measure the maximum spacing between the bottom of the grooves of the reinforcing ribs in the mold cavity of the blow molding die. The maximum spacing at the top is calculated as the ratio of the maximum spacing at the bottom of the trench to the maximum spacing at the top of the trench, according to formula (3).

6.4.4 Test on the included angle between the two sides of the reinforcing rib section of the blow molding die cavity Use an angle measuring instrument with an accuracy of not less than 0.1° to measure the included angle between the two sides of the cross-section of the reinforcing rib of the blow molding die cavity.

6.4.5 Test on the top and bottom fillet radii of the reinforcing ribs on the molding surface of blow molding die Inspect the reinforcing ribs on the molding surface of the blow molding die. Use a dimensional measuring instrument with an accuracy of not less than

0.01 mm to measure the top and bottom of the reinforcing ribs. Bottom corner radius.

6.4.6 Test on the ratio of the center depth of the bottom mold to the maximum diameter of the bottom mold in blow molding dies Using a dimensional measuring instrument with an accuracy of not less than

0.01 mm, measure the center depth and maximum diameter of the bottom mold of the blow molding die. Formula (4) is used to calculate the ratio of the center depth of the bottom mold to the maximum diameter of the bottom mold in blow molding.

6.4.7 Test on the ratio of text depth to line width in the bottom mold of blow molding die Using a dimension measuring instrument with an accuracy of not less than

0.01 mm, measure the depth and line width of the bottom mold text of the blow molding die, and calculate according to formula (5). The ratio of the depth of the text in the base model to the line width.

6.4.8 Temperature Deviation Test of Blow Molding Die Install the blow molding die onto the blow molding machine, set a suitable mold temperature, and after the blow molding machine has stabilized, measure the temperature with an accuracy of not less than 0.1°C. A temperature instrument was used to measure the surface temperature at symmetrical positions on the left and right halves of the blow molding die, and the temperature deviation between the left and right halves was calculated.

6.4.9 Other requirements for blow molding dies (tests) Check other requirements for blow molding dies according to GB/T 38461.

6.5 Blow Molding Machine Test

6.5.1 Pre-blowing pressure and main-blowing pressure deviation test The pre-blowing pressure and main-blowing pressure deviation tests should be conducted separately, and the test methods are as follows:

a) Pre-blown bottle pressure deviation. Manually activate the pre-blown bottle test function, perform pre-blown bottle tests at each station, record the pressure at each station, calculate the average value, and then... The average value is used as the baseline, and the pressure deviation of each workstation is recorded.

b) Deviation in main blown bottle pressure. Under normal operating conditions, record the main blow pressure at each station, calculate the average value, and use this average value as a benchmark to record the pressure at each station. deviation.

6.5.2 Test of Cooling Device for Carbonated Beverage Bottle Blow Molding Machine Visually inspect whether the carbonated beverage bottle blowing machine has a cooling device.

6.5.3 Other requirements and tests for blow molding machines Check other requirements for blow molding machines according to GB/T 29648.

6.6 PET Bottle Test Inspect the quality of PET bottles in accordance with GB/T 41167 or as required by the customer.

7.Evaluation of Energy Conservation and Emission Reduction Effects While ensuring production capacity and quality, the blow molding machine should operate continuously for no less than 8 hours each for the low-pressure blow molding system and the general blow molding system, and inspect... Check the total power consumption of the blow molding system, and calculate the difference between the total power consumption of the low-pressure blow molding system and the total power consumption of the general blow molding system per 10,000 bottles according to formula (6). Value, which is the carbon emission reduction per 10,000 bottles.