National Standard of China for automatic rotary PET bottle blow molding machine

National Standard of China for automatic rotary PET bottle blow molding machine
Here is everything you want to know about National Standard of China for automatic rotary PET bottle blow molding machine from A to Z.

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National Standard of China for automatic rotary PET bottle blow molding machine

01.

Scope

This standard specifies the terms and definitions, models, types, basic parameters and working conditions, technical requirements, test methods, inspection rules, signs, Packaging, transportation and storage.
This standard applies to the fully automatic rotary PET bottle blowing machine (hereinafter referred to as the blowing machine) that uses the two-step bottle-making process to blow PET bottles for packaging in the fields of beverages, alcohol, condiments, food, daily chemicals, and medicine.

02.

Normative references

The following documents are essential for the application of this document. For dated references, only the dated version applies to this document.
For undated references, the latest edition (including all amendments) applies to this document.
GB/T191 Graphical Marks for Packaging, Storage and Transportation
GB/T 2828.1 Counting Sampling Inspection Procedure Part 1: Lot-by-Lot Inspection Sampling Plan Retrieved by Acceptance Quality Limit (AQL)
GB2894 Safety signs and their usage guidelines
GB/T3766 General technical conditions for hydraulic systems
GB4806.1 Hygienic Standard for Rubber Products for Food
GB5226.1—2008 Mechanical and electrical safety-Mechanical electrical equipment-Part 1: General technical conditions
GB/T7311 Packaging Machinery Classification and Model Compilation Method
GB/T7932 General technical conditions for pneumatic systems
GB/T9969 Industrial Product Instruction Manual General Provisions
GB13113 Hygienic standard for polyethylene terephthalate molded products for food containers and packaging materials
GB13114 Hygienic standard for polyethylene terephthalate resin for food containers and packaging materials
GB/T13277.1—2008 Compressed Air Part 1: Pollutant Purification Level
GB/T13306 Signs
GB/T13384 General technical conditions for packaging of mechanical and electrical products
GB/T14253 General technical conditions for light industrial machinery
GB16798 Food Machinery Safety and Hygiene
GB/T16855.1 Machinery Safety-Related Safety Components of Machinery Control System-Part 1: General Rules for Design
GB19891 Machinery Safety – Hygienic requirements for mechanical design
JB/T7232 Packaging machinery – Simple method for determination of noise sound power level
JB7233 Packaging Machinery Safety Requirements
QB/T1868 Polyethylene terephthalate (PET) carbonated beverage bottle
QB2357 Polyester (PET) soft drink bottle
QB/T2665 Polyethylene terephthalate (PET) bottle for hot filling

03.

Terms and Definitions

The following terms and definitions apply to this document

3.1
unscrambling preform
The process of arranging the preforms neatly and regularly from the silo to the preform feeding track of the blowing and warming machine.
3.2
preform block
The preform is stuck during the transfer process.
3.3
blowing station
The unit that can complete the functions of stretching and blowing bottles is composed of a stretching mechanism, a mold and a mold base device.
3.4
blow molding bottle
The preheated preform enters the mold cavity, and is stretched and blown into the finished bottle with compressed air.
3.5
two stage
The method of dividing the production of finished bottles into two independent processes of blanking and blowing finished bottles.
3.6
preform damaged ratio
In the normal production process of the blow molding machine, the percentage of the number of preforms lost to the total number of qualified preforms input.
3.7
qualified blow molding bottle ratio
In the normal production process of the blow molding machine, the percentage of qualified sample bottles to the total number of sample bottles.

04.

Model, type, basic parameters and working conditions

4.1 Model

Example:
ZPXHD20 means that the number of blow molding stations is 20, the finished bottle is a large cavity automatic rotary PET bottle blowing machine suitable for hot filling, the first design

4.2 Type and basic parameters

4.2.1 Type of blow molding machine:
a) According to the applicable filling temperature of the finished bottle, it is divided into: hot filling (represented by “H”), cold filling (not indicated);
b) According to the type of cavity, it is divided into: small cavity (the diameter of the blowing bottle is less than 75 mm, indicated by “X”); large cavity (the diameter of the blowing bottle is greater than 120 mm, indicated by “D”); The bottle diameter ranges from 75 mm to 120 mm, not indicated).

4.2.2 The main structure of the blow molding machine:
a) Preform storage and conveying device;
b) Preform heating device;
c) die set;
d) Blowing device.

4.2.3 Basic parameters of blow molding machine:
a) Rated production capacity: bottle/h;
b) Number of blow molding stations: pcs;
c) Voltage, frequency: V, Hz;
d) Power: kW;
e) Dimensions: (length × width × height) mm;
f) Mass: kg;
g) Maximum blowing diameter: mm;
h) Maximum blowing height: mm;
i) Maximum working pressure: MPa.

4.3 working conditions

4.3.1 The specifications of the preform should be consistent, and the material of the preform and the size of the mouth of the preform should comply with the relevant standards. The preform should meet the production technical requirements of the blowing machine and the finished bottle blowing requirements.

4.3.2 Blowing compressed air is divided into low-pressure operation compressed air and process compressed air (including pre-blowing and main-blowing). GB/T13277.1-2008 relevant provisions, and should comply with the provisions of Table 1

Table 1 What is the Compressed air quality requirements for blow molding machine

Substances in compressed airCompressed air for low pressure operationProcess compressed air
particles< class 5 max size 5 0 pm< Class 1 maximum size 1.0 pm
water< Level 4
Dew point 3 ℃ at the highest pressure
< Level 4
Dew point 3 ℃ at the highest pressure
Oil<Class 2 maximum content 0.1 mg/m3
< Class 1 maximum content 0.01 mg/m3

4.3.3 The cooling water used in the cooling system can be recycled, and the cooling water shall meet the following requirements:
a) pH value is 7~8;
b) The total hardness (calculated as CaCO3) is less than 140 mg/L;
c) The particle size of pollutants is not more than 0.1 mm;
d) Appropriate amount of antifreeze preservatives should be added.

4.3.4 If the mold is heated by oil, the heating oil should use special heat transfer oil that can be heated to 180 °C.

4.3.5 The deviation between the power supply voltage of the blow molding machine and the rated voltage should be kept within the range of ±7%.

4.3.6 There should be no external air flow and heat radiation affecting the quality of blowing in the working room. The ambient temperature during work is 15 °C ~ 35 °C (the fluctuation range is ±3 °C), and the air is filtered by primary and intermediate effects.

05.

Technology requirement

5.1 General requirements

5.1.1 The blow molding machine shall be manufactured according to the drawings and technical documents approved by the prescribed procedures.
5.1.2 The blow molding machine should run smoothly, and the movement parts and components should be sensitive, coordinated, and accurate, and there should be no jamming and abnormal noise.
5.1.3 The air circuit, liquid circuit and lubrication system of the blow molding machine should be unblocked, free from blockage and leakage.
5.1.4 The preform should not be stuck before entering the heating device.

5.2 Performance requirements

5.2.1 The production capacity of the blow molding machine should meet the requirements of the rated production capacity, and the production efficiency in continuous production should not be less than 96%.
5.2.2 Under normal working conditions, the surface temperature of the external part of the blow molding machine in contact with the human body should not be higher than 50 °C.
5.2.3 The preform loss rate of the blow molding machine should not exceed 0.3%.
5.2.4 The finished bottle for cold filling shall comply with the relevant regulations of QB/T1868 and QB2357, and the finished bottle for hot filling shall comply with the relevant regulations of QB/T2665.
5.2.5 The bottle body should not be polluted during the blowing process, and the hygienic requirements of the finished bottle should comply with the provisions of GB13113.
5.2.6 When the blowing machine is working normally, the noise sound pressure level should not be greater than 85dB(A).
5.2.7 The heating and cooling device of the mold should be able to meet the temperature requirements of the mold, and the stability of pressure and flow should be ensured when using fluid medium.
5.2.8 The temperature deviation of the left and right half molds and the bottom mold of the blow molding machine in contact with the bottle body should not exceed 5 °C.
5.2.9 The working temperature of the hot-filling mold body should not be higher than 170 °C, and the temperature deviation at the same position of the mold at each station should be ±1.5 °C.
5.2.10 The blow molding machine shall have the function of single-mode blowing test and multi-station pre-blowing test function to meet the needs of single-mode and multi-station blowing tests. The maximum diameter and height deviation of multi-station pre-blown bottles should not exceed ±5 mm.
5.2.11 The pre-blowing pressure of each station should be consistent, with a deviation of ±0.01 MPa, and the deviation of high-pressure air-blowing pressure is ±0.1 MPa.

5.3 Technical conditions of mold assembly

5.3.1 When blowing different finished bottles, the molds should be easy to replace, and the installation dimensions of each station should ensure that the molds can be universally interchanged.
5.3.2 When installing the mold, it should be ensured that the joint surface is completely fitted and the bolt connection is firm and reliable.
5.3.3 After the mold is installed, check the installation height. The height deviation of the mold reference plane at each station is ±0.05 mm, and the horizontal height tolerance of the two halves of the mold is not greater than 0.1 mm. The movement stroke of the mold opening and closing cam and the bottom mold lifting cam The deviation is 0.03 mm~0.05 mm.
5.3.4 The clamping gap should be controlled within the range of 0.1 mm~0.15 mm (the clamping gap of the hot filling mold is the gap when the mold temperature is reached).

5.4 Electrical Safety Requirements

5.4.1 Each circuit control system of the blow molding machine should be safe, reliable and accurate, and meet the requirements of GB5226.1:
a) All electrical connectors are firmly connected and numbered;
b) The operation button should be flexible, and the indicator light should be normal;
c) There should be an emergency stop device, the effective operation of the emergency stop actuator suspends the subsequent command, and the operation command is valid until it is reset. Reset should only be done manually at the point where the emergency action command was initiated. A commanded reset should not restart the machine, but only allow restarting.
5.4.2 The protection level of the electrical cabinet should reach IP54.
5.4.3 The insulation resistance measured when 500Vd.c. is applied between the power circuit wires and the protective bonding circuit shall not be less than 1 MΩ.
5.4.4 All exposed conductive parts of the blow molding machine shall be connected to the protective bonding circuit according to the requirements in 8.2.1 of GB5226.1-2008. The connection between the ground terminal or the ground contact and the grounded metal part should have a low resistance value, and its resistance value should not exceed 0.1Ω.
5.4.5 The power circuit wires of the blow molding machine and the protective connection circuit should be subjected to a withstand voltage test for at least 1s.

5.4.6 The blow molding machine shall be equipped with a mechanical emergency braking device. When the power is off, the braking device shall be in the braking state, and the braking device shall be equipped with a manual reset switch.
5.4.7 The blow molding machine should be equipped with an automatic compressed air pressure relief device. When the emergency brake button is pressed or the safety door is in the open state, the compressed air automatic pressure relief device should be automatically activated to quickly relieve the pressure.
5.4.8 The blow molding machine shall have the function of shielding the cavity, and when the cavity is shielded, it will automatically stop the mold from entering the blank.

5.5 Safety and health requirements

5.5.1 The safety protection of the blow molding machine shall meet the following requirements:
a) The safety protection of the blow molding machine shall comply with the provisions of JB7233; and shall be equipped with safety protection devices whose safety level shall comply with the provisions of GB/T16855.1.
b) There should be clear and conspicuous safety warning signs such as manipulation, lubrication and anti-scalding on the blow molding machine, and the safety signs should comply with the provisions of GB2894.
c) The blow molding machine should be provided with interlock protection to ensure the safety of personnel, materials and equipment. When blowing hot-filling bottles, safety fences should be installed around the mold thermostat and the heating oil circuit.
d) Fasteners such as bolts, nuts and other parts on the blow molding machine should be reliably fixed to prevent loosening and should not fall off due to vibration.
e) The safety performance of the pneumatic system of the blow molding machine shall comply with the provisions of GB/T7932, and the safety performance of the liquid system shall comply with the provisions of GB/T3766.
5.5.2 The raw materials used in the blow molding machine and the purchased supporting parts shall have the quality certificate of the manufacturer.
5.5.3 The rubber seals of the blow molding machine shall comply with the provisions of GB4806.1.
5.5.4 For the blow molding machine used in the food industry, the safety and hygiene requirements of the principles of material selection, design, manufacture and configuration shall comply with the provisions of GB16798. The safety and hygiene requirements of the mechanical design of the blow molding machine shall comply with the provisions of GB19891.
5.6 Appearance quality and specification requirements
5.6.1 The processing, assembly and appearance quality of the blow molding machine shall comply with the relevant regulations of GB/T14253.
5.6.2 The paint and spray layer on the non-processed surface of the blowing machine should be smooth, uniform in color, and free from obvious defects such as dirt, flow marks, and blistering.
5.6.3 The surface-treated parts of the blow molding machine should be uniform in color and free from defects such as blistering, layering, and rusting.
5.6.4 The instruction manual of the blow molding machine should be written in accordance with the provisions of GB/T9969, and the instruction manual should specify the oiling cycle of the transmission part of the blow molding machine.

06.

Test methods

6.1 Test conditions

6.1.1 The test environment temperature should be 15 °C~35 °C.
6.1.2 The polyethylene terephthalate resin used in the test shall meet the requirements of GB13114.

6.2 General Requirements Check

6.2.1 Dry running test
After each bottle blowing machine is assembled, it should be tested for empty running, and the continuous empty running time should not be less than 48h. Check the running condition of the blowing machine, which should meet the requirements of 5.1.2, 5.4.1, 5.4.6 and 5.4.7.
6.2.2 Air, liquid and lubrication system tightness inspection
The air circuit, liquid circuit and lubrication system of the blow molding machine can be checked for tightness by the following methods:

a) Gently wipe around the seals of pneumatic components and lubrication systems with absorbent cotton, and observe whether there is any oil stain on the absorbent cotton;
b) Apply high-foaming detergent water to the seals of the pneumatic components to observe whether there is air leakage;
c) After the hydraulic system is assembled, the pressure test should be done at 1.25 times the rated pressure for 30 minutes, there should be no leakage, and the pressure drop should not be greater than 5%.

6.3 Performance test

6.3.1 Production capacity test
Under the normal production conditions of the blowing machine, run continuously at the rated speed for 10 minutes, count the total number of finished bottles completed by blowing, and carry out a total of two times, calculate the production capacity according to formula (1), and the two calculation results should conform to 5.2.1 Provisions.

V=M1/10 x 60                  (1)

where:
V ——production capacity, the unit is bottle per hour (bottle/h);
M1——The total number of finished bottles, the unit is bottle.

6.3.2 Production efficiency test
The test can be carried out at the user’s production site. Under the normal production conditions of the blow molding machine, the blow molding machine runs continuously at the rated speed for 8 hours each time, and is carried out three times in a week. The average value of the three times shall meet the requirements of 5.2.1.

n=M2/(F x T) x 100%                    (2)

where:
n ——production efficiency, %;
F —— rated production capacity, the unit is bottle per hour (bottle/h);
T ——effective time, the unit is hour (h);
M2——The total number of finished bottles, the unit is bottle.
The effective time T is: the test time 8h minus the sum of all downtimes (∑t) of any mechanism during the test time not caused by the failure of the blow molding machine itself. Calculate according to formula (3):

T=8- ∑t                    (3)

where:
T ——effective time, the unit is hour (h);
∑t——The sum of all downtimes of any institution not caused by the failure of the blow molding machine itself, the unit is hours (h)

6.3.3 Determination of surface temperature of blow molding machine
Use a thermometer with an accuracy of 0.1 °C to measure the surface temperature of the outside of the blow molding machine in contact with the human body, which should meet the requirements of 5.2.2.

6.3.4 Preform loss rate test
Under the normal production conditions of the blow molding machine, the continuous operation at the rated speed is not less than 60 minutes, and the total number of qualified preforms and the number of finished bottles put into the test process are counted, and the preform loss rate is calculated according to formula (4).

L=(1-m/q) x 100%          (4)

where:
L ——preform loss rate, %;
m ——the number of finished bottles, the unit is bottle;
q ——The total number of qualified preforms, the unit is bottle.

6.3.5 Blowing qualification rate test
Under normal production conditions, the blow molding machine should run continuously at the rated speed for not less than 60 min. According to the method specified in GB/T 2828.1, sample the produced bottles. A sampling plan for normal inspection is adopted. The general inspection level is Class II, according to AQL. =0.25, and according to 5.2.4,
The quality of the sample bottle shall be checked as specified in 5.2.5.

6.3.6 Noise Test
In the process of continuous operation, the noise of the blowing machine should be measured by the method specified in JB/T7232, and the following method can also be used: when the noise value adopts the A-weighted sound pressure level, the environmental background noise value is the same as the measured blowing machine. When the difference between the working noise values ​​is greater than 10dB(A), use a precision sound level meter to measure the noise in the four directions of the front, rear, left and right directions of the blowing machine, 1m away from the blowing machine and 1.5m away from the operating platform. The maximum value of the measured noise value is taken as the noise value of the blow molding machine.

6.3.7 Determination of mold preheating temperature
After installing the molds at each station of the blow molding machine, turn on the mold temperature machine, set the oil temperature of the mold body and the bottom mold to a suitable temperature, and use a thermometer with an accuracy of 0.1 °C to measure the left and right half molds and the bottom respectively. The surface temperature and temperature difference between the mold and the bottle body should meet the requirements of 5.2.8.

6.3.8 Mold temperature deviation test
The temperature of the mold temperature machine was set to 150 °C, and after heating for 50 min, the surface temperature of the mold at the same position of each station was measured with a thermometer with an accuracy of 0.1 °C.

6.3.9 Single-mode bottle blowing test function and multi-station pre-blowing test function test
6.3.9.1 Functional test of single mold blowing test
Close the station that does not blow the bottle, only open the station that needs to be tested, and then enter the normal production state, check whether the model number of the bottle blown by the blow molding machine is consistent with the model number of the set station, and check the other different stations. Test in sequence.
6.3.9.2 Multi-station pre-blowing test function test
Turn off the high-pressure blowing function, only turn on the pre-blowing function, and blow a bottle with a whole mold. The bottle that is pre-blown by the blow molding machine should meet the requirements of 5.2.10.

6.3.10 Pre-blowing pressure and high-pressure blowing pressure deviation test
6.3.10.1 Pre-blowing pressure deviation test
Manually turn on the pre-blowing test function, carry out the air-blowing test for each station, and record the pressure of each station. The actual pressure deviation of each station shall comply with the provisions of 5.2.11.
6.3.10.2 High pressure blowing pressure deviation test
Under normal working conditions, check the high-pressure blowing pressure of each station. The actual pressure deviation of each station shall comply with the provisions of 5.2.11.

 

6.4 Electrical safety test
6.4.1 Use an insulation resistance meter to measure the insulation resistance according to the provisions in 18.3 of GB5226.1-2008, which shall comply with the provisions of 5.4.3.
6.4.2 When the power supply of the electrical installation is cut off and the current is obtained from the power supply with a no-load voltage not exceeding 12V (AC or DC), and the current is equal to 1.5 times the rated current or 25A (whichever is the greater), Pass this current alternately between the ground terminal and each accessible metal part. Measure the voltage drop between the grounding terminal and each accessible metal part, and calculate the resistance value from the current and voltage drop, which shall comply with the provisions of 5.4.4.6.4.3 Use a withstand voltage tester to perform the withstand voltage test according to the provisions of 18.4 in GB5226.1-2008, which shall comply with the provisions of 5.4.5.

6.5 Inspection of safety and hygiene requirements
6.5.1 Check the safety protection of the blow molding machine, which shall comply with the provisions of 5.5.1.
6.5.2 Check the material report and quality certificate of the blow molding machine, which shall meet the requirements of 5.5.2~5.5.4.
6.6 Appearance quality inspection
Visual inspection of the appearance quality of the blow molding machine should meet the requirements of 5.6.1~5.6.3.

07.

testing regulations

7.1 Inspection classification

The inspection of the blow molding machine is divided into factory inspection and type inspection. The inspection items, requirements and test methods are as specified in Table 2.

Table 2 Inspection items

Serial number
Test items
Identify Category
Require
Experiment method
Type inspectionFactory inspection
1Electrical Safety Test
5 · 4 · 3一5 · 4 · 5 
2Dry running test5 · 1. 2、5 · 4 · 1、
5 · 4 · 6、5 · 4 · 7
6 · 2 · 1
3Air, liquid and lubrication system tightness inspection5 · 1 · 36 · 2 · 2
4production capacity test5 · 2 · 16 · 3 · 1
5Production efficiency test5 · 2 · 16 · 3 · 2
6Determination of surface temperature of blow molding machine
 
5 · 2 · 26 · 3 · 3
7Preform loss rate test5 · 2,36 · 3 · 4
8Blowing qualification rate test5 · 2 · 4一5 · 2 · 56 · 3 · 5
9Noise test5 · 2 · 66 · 3 · 6
10Determination of mold preheating temperature5 · 2 · 86 · 3 · 7
11Mold temperature deviation test5 · 2 · 96 · 3 · 8
12Single-mode blowing test function and multi-station pre-blowing test function test5 · 2 · 106 · 3 · 9
13Pre-blowing pressure and high-pressure blowing pressure deviation test5 · 2 · 116 · 3.10
14security check5 · 5 · 16 · 5 · 1
15Material inspection5 · 5 · 2、5 · 5 · 46 · 5 · 2
16Appearance quality inspection5 · 6 · 1、5 · 6 · 3 
17Product Labels and Technical Documents5 · 6 · 48 · 1、8 · 2 · 5

7.2 Factory inspection

Each blow molding machine should be inspected at the factory, and only after passing the inspection can it leave the factory.

7.3 Type inspection

7.3.1 Type inspection shall be carried out in one of the following situations:
——The old product is transferred to the factory for production or the new product is trial-formulated;
——After the formal production, such as material, structure and process have great changes, which may affect the performance of the blow molding machine;
——During normal production, after accumulating a certain amount of output, or conducting regular inspections every year;
——Resume production after long-term shutdown;
——There is a big difference between the factory inspection results and the last type inspection;
——The national quality supervision agency proposes type inspection requirements.
7.3.2 The type inspection shall comply with the provisions of Chapter 5, and the inspection items are shown in Table 2. All inspection items are qualified for type inspection. In the type inspection, if one of the continuity, insulation resistance, and withstand voltage tests of the protective bonding circuit in the electrical safety test fails, the type inspection is judged to be unqualified. If there is one unqualified item in other items, the unqualified item should be re-tested twice. If it is still unqualified, it will be judged that the type inspection of the blowing machine is unqualified.

08.

Marking, Packaging, Transportation and Storage

8.1 logo

The blow molding machine should fix the sign at the obvious position, and the size and technical requirements of the sign shall be in accordance with the provisions of GB/T13306. At least the following shall be indicated on the sign:
—Product number;
—product name;
—Product performance standards;
——The main technical parameters of the product;
— Date of manufacture and serial number;
— The name and location of the manufacturer.

8.2 Packaging

8.2.1 The transport packaging of the blow molding machine shall comply with the provisions of GB/T13384.
8.2.2 Before packaging of the blow molding machine, the exposed surface should be treated with anti-rust treatment.
8.2.3 The packaging box of the blow molding machine should have reliable moisture-proof measures, and should be firm and reliable to meet the requirements of transportation and loading and unloading.
8.2.4 The special tools and wearing parts that come with the blow molding machine should be packed and fixed in the packing box.
8.2.5 The technical documents shall be properly packaged and placed in the packing box, and shall include the following contents:
—Product certification;
—Instruction Manual;
—Packing List.
8.2.6 The outer surface of the packing box shall be clearly marked with the signs of delivery and transportation operations, and shall comply with the relevant provisions of GB/T191.

8.3 Transport and storage

8.3.1 The blow molding machine should be handled with care during transportation, inversion and collision are not allowed.
8.3.2 The blow molding machine should be stored in a dry and ventilated place without corrosive gas.

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John Lau.

John Lau.

John Lau, a project manager holding an engineering bachelor's degree, became fascinated with optimizing beverage production equipment during his university days. As an overseas project manager, he firmly believes that educating clients on achieving efficient workflows through customized equipment design is one of the most impactful aspects of his job.

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