GB/T 29648-2026Fully automatic rotary PET bottle blow moulding machines (English PDF)

4.2 Composition

4.2.1 Main components of a blow molding machine.

a) Preform storage, sorting, and conveying equipment;

b) Preform heating device;

c) Preform transfer device after heating;

d) Blow molding station;

e) Finished bottle transfer device;

f) Bottle breakage detection and rejection device;

g) Electrical control system;

h) Transmission mechanism.

4.2.2 Optional accessories for blow molding machines.

a) Air recovery device;

b) Detection device.

4.3 Basic Parameters Names and units of basic parameters for blow molding machines.

a) Rated production capacity. bottles/hour;

4.4 Working Conditions

4.4.1 The operating ambient temperature should be 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.

4.4.2 The blow molding machine workshop should be free from external airflow and heat radiation that could affect the blow molding quality, and the air cleanliness should comply with GB 50073-2013. The specifications for level N5 in Table 3.0.1.

4.4.3 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.

4.4.4 Compressed air shall comply with the following requirements.

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 2023 regulations stipulate that the particle size distribution must be no lower than level 4, the moisture and liquid water distribution must be no lower than level 4, and the total oil content distribution must be no lower than level 4. Level 2;

b) The compressed air supply pressure of the 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].

0.1 MPa, the quality of compressed air shall comply with the provisions of GB/T 13277.1-2023.particle size not lower than level 1, humidity and The liquid water grade is not lower than grade 4, and the total oil content grade is not lower than grade 1.

4.4.5 Cooling water shall meet the following requirements.

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

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

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

0.1 mm.

4.4.6 If the mold uses oil heating, the heating oil should be heat transfer oil that can be heated to 180°C.

5.1 General Requirements

5.1.1 Blow molding machines shall be manufactured in accordance with the drawings and technical documents approved according to the prescribed procedures.

5.1.2 The blow molding machine should operate smoothly, and the moving parts should move sensitively, coordinately, and accurately, without jamming or abnormal noise.

5.1.3 The air circuit, cooling water circuit, and lubrication system of the blow molding machine should be unobstructed, without blockages or leaks.

5.1.4 When there is a shortage of preforms or when preforms are stuck, there should be an audible and visual warning.

5.2 Performance Requirements

5.2.1 The production capacity of the blow molding machine should meet the rated production capacity requirements, and the production efficiency should not be less than 97% during continuous production.

5.2.2 Finished bottles shall comply with the provisions of GB/T 41167-2021 and related standards, and the bottle blowing qualification rate shall not be less than 99.5%.

5.2.3 The preform loss rate should not exceed 0.25%.

5.2.4 The time for the preform heating device to rise from ambient temperature to operating temperature should be less than 3 minutes.

5.2.5 Blow molding should not be performed when there is no preform in the blow molding die.

5.2.6 The blow molding machine should have a single-mold blow molding test function; during the test, the preform should enter the set mold.

5.2.7 The blow molding machine should have a pre-blow bottle testing function, and the maximum diameter (or diagonal) deviation of the bottles pre-blown at each station should not exceed that of the finished bottle. The maximum height deviation of pre-blown bottles at each station should not exceed 8% of the finished bottle height, which is 8% of the diameter (or diagonal).

5.2.8 The pre-blowing pressure of each station should be consistent, with a deviation of ±0.01MPa; the deviation of the main blowing pressure should be ±0.1MPa.

5.2.9 When the blow molding machine is working normally, the noise sound pressure level should not exceed 85 dB(A).

5.3 Requirements for blow molding dies

5.3.1 The performance of blow molding dies shall comply with the provisions of

5.2.3 in GB/T 38461-2020.

5.3.2 The manufacturing quality and assembly requirements of blow molding dies shall comply with the provisions of

5.4 in GB/T 38461-2020.

5.3.3 The height deviation of the reference surface of the blow molding die at each station is ±0.05mm.

5.3.4 The mold closing clearance should be controlled within the range of 0.10mm~0.15mm (for molds requiring heating, the mold closing clearance should be the clearance at the time the mold temperature is reached). gap).

5.4 Remote Service Requirements

5.4.1 Blow molding machines should have remote service capabilities.

5.4.2 Blow molding machines with remote service capabilities should meet the following requirements.

a) Configure a selection device to start a remote service, such as a lockable mode selector with password, authentication, or equivalent functionality. Device;

b) Remote service connection can only be achieved through active initiation on the blow molding machine itself. When the blow molding machine is in remote service mode, the blow molding machine... Instructions should be issued, and status should be displayed;

c) All safety functions activated on the blow molding machine (e.g., emergency stop) should take precedence over all remotely activated functions, in case of remote service connection interruption. It will not lead to any dangerous situation.

5.5 Electrical Safety Requirements

5.5.1 The electrical control system of the blow molding machine shall comply with the requirements of GB/T 5226.1-2019, and shall be safe, reliable and accurate in operation.

5.5.2 The design of safety components in the blow molding machine control system shall comply with the relevant provisions of GB/T 16855.1.

5.5.3 The insulation resistance measured when DC 500V is applied between the power circuit wires and the protective connection circuit of the blow molding machine shall not be less than 1MOmega.

5.5.4 The power circuit wires and protective connection circuits of the blow molding machine shall undergo a withstand voltage test for at least 1 second without flashover breakdown. Phenomenon.

5.5.5 The blow molding machine shall have a reliable grounding device and a clear grounding mark. All exposed conductive parts shall comply with GB/T 5226.1- The requirements of section

8.2 of.2019 stipulate connection to the protective linkage circuit. The connection between the grounding terminal or grounding contact and the grounding metal component should have... Low resistance value; its resistance value should not exceed 0.1Omega.

5.5.6 The protection level of the electrical cabinet enclosure shall meet the IP54 protection level specified in GB/T 4208-2017.

5.5.7 The functional requirements and design of the emergency stop device for the blow molding machine shall comply with the provisions of GB/T 16754-2021, and the actuation mechanism of the emergency stop device shall... The emergency stop device should use a button that is easy to operate with the palm of your hand, and the control position should comply with the provisions of

4.3.2 in GB/T 16754-2021.

5.5.8 The blow molding machine shall have a function to prevent accidental start-up, and its design shall comply with the provisions of GB/T 19670.

5.5.9 The control cabinet of the blow molding machine and the energy circuits that generate hazards should have lock/tag functions.

5.5.10 The corresponding protective measures taken for each dangerous moving device or dangerous part that may be accessed from the normal working position, and their safety The required performance level (PLr) of the control system should meet the requirements of Table 1.

5.5.11 Safety control units shall use safety circuits, and safety control circuits shall use a safety voltage of no more than 36V.

5.6 Mechanical Safety Requirements

5.6.1 The safety protection of blow molding machines shall comply with the provisions of JB7233, and their safety design shall comply with the provisions of GB/T 15706.

5.6.2 The design and manufacture of protective devices for blow molding machines shall comply with the provisions of GB/T 8196, and safety doors for operator access shall be equipped with safety features. The design and selection of all door-related interlocking devices shall comply with the provisions of GB/T 18831.

5.6.3 Blow molding machines shall have clear and conspicuous warning and reminder signs, and safety signs shall comply with the provisions of GB 2894.

5.6.4 Fasteners such as connectors, bolts, and nuts of blow molding machine parts should be secure and should not come off due to vibration.

5.6.5 Protective devices shall be installed when moving parts such as gears, transmission belts, and chains are exposed. Reciprocating motion mechanisms shall have limit devices for extreme positions.

5.6.6 Protective devices or heat insulation devices should be installed on parts of the blow molding machine where operators may come into contact with high-temperature surfaces and suffer burns. Protection.

5.6.7 The preform heating device of the blow molding machine shall comply with the following provisions.

a) Install temperature display instruments and temperature control protection devices. When the temperature is higher or lower than the set value, the feeding of billets and the removal of billets from the furnace should be stopped. The inner bottle preform has an audible and visual warning.

b) The external surface temperature does not exceed 50°C;

c) Protective covers, baffles, or other protective devices should be installed at both ends of the preform inlet and outlet and at the edges of the conveying device;

d) A removal mechanism is provided to remove the preform from the heating device in the event of a power outage, unexpected power failure, or equipment malfunction;

e) Install an exhaust system to remove harmful gases.

5.6.8 The blow molding machine shall be equipped with a pressure control protection device. When the pressure is higher or lower than the limit value, there shall be an audible and visual warning and the feeding of preform shall be stopped.

5.6.9 The blow molding machine shall have an overload protection device, which shall stop the machine and sound an alarm when an overload occurs.

5.7 Materials and Design Requirements

5.7.1 The purchased components used in the blow molding machine shall have quality certificates from the manufacturer.

5.7.2 The hygiene requirements for the mechanical design of blow molding machines shall comply with the provisions of GB/T 19891.

5.7.3 For blow molding machines used in the food industry, the safety and hygiene requirements for material selection, design, manufacturing, configuration, and installation shall comply with GB 16798. According to the regulations.

5.7.4 The lubricants, heating oils, cooling water, etc. used in the blow molding machine should not contaminate the bottle body.

5.8 Appearance Quality Requirements

5.8.1 The surface of the blow molding machine should be flat and smooth, easy to clean, and free from obvious sharp edges, burrs, scratches, dents, and other defects.

5.8.2 The paint and powder coating layers of the blow molding machine, as well as the surface-treated parts, should be smooth, even in color, and free from obvious scratches, dirt, or flow marks. Defects such as blistering, delamination, and corrosion.

5.8.3 The weld seams of welded parts should be smooth and free of defects that affect the appearance quality.

5.8.4 Exposed portions of electrical, pneumatic, lubrication, and cooling water pipes should be arranged compactly and neatly, and secured with pipe clamps where necessary. The pipe should not be twisted or folded.

5.9 User manual requirements

5.9.1 The instruction manual for blow molding machines shall be prepared in accordance with the provisions of GB/T 9969.

5.9.2 The instruction manual for the blow molding machine should include relevant content on operation, mold replacement, maintenance and repair.

6.2 General Requirements Inspection

6.2.1 No-load test After each blow molding machine is assembled, a no-load test should be performed. The continuous no-load test time should not be less than 4 hours to check the machine performance.

6.2.2 Inspection of the sealing performance of the air circuit, cooling water circuit and lubrication system The following methods can be used to check for leaks.

a) Conduct a sealing test using compressed air as the medium and at the pipeline design pressure, and apply soapy water or detergent to the seal of the pneumatic components. Check for air leaks at the seals and pipe connections;

b) After the cooling water system is assembled, a pressure test should be conducted at

1.25 times the rated pressure for 30 minutes. There should be no leakage, and the pressure drop should not be excessive. At 5%;

c) Gently wipe around the seals and pipe connections of the lubrication system with degreased cotton and observe whether there are any oil stains on the cotton.

6.3 Performance Test

6.3.1 Production Capacity Test When the blow molding machine is working normally, it runs continuously at the rated speed for 30 minutes. The total number of finished bottles produced is counted, and the production is calculated according to formula (1). ability.

6.3.2 Production Efficiency Test When the blow molding machine is working normally, it runs at its rated production capacity for 8 hours. The total number of finished bottles completed is counted, and the production efficiency is calculated according to formula (2).

6.3.3 Blow Molding Yield Test When the blow molding machine is operating normally, it should run at its rated production capacity for at least 1 hour, continuously extracting sample bottles at a rate more than three times the number of samples from the blow molding station. Perform at least 5 tests, with 10-minute intervals between each test, and count the total number of sample bottles. The total number of sample bottles collected should not be less than.200. The test method described in Chapter 6 of GB/T 41167-2021 is used to check the number of non-conforming sample bottles and calculate the blow molding pass rate according to formula (3).

6.3.4 Preform Loss Rate Test When the blow molding machine is working normally (this can be done simultaneously with test 6.3.2), record the total number of preforms input into the blow molding machine and the number of bottles lost within 8 consecutive hours. The number of preforms (excluding losses caused by factors other than the blow molding machine itself) is used to calculate the preform loss rate according to formula (4).

6.3.5 Temperature Rise Test Use a stopwatch to measure the time required for the preform heating device to rise from ambient temperature to operating temperature.

6.3.6 Functional test for bottle blowing without preform When the blow molding machine is working normally, control the bottle preform to enter the mold cavity intermittently, and check whether the blowing stops at the station where there is a shortage of bottle preform.

6.3.7 Single-mold blow molding test function experiment Shut down the blow molding stations that are not in operation, and only turn on the blow molding stations that need to be tested. Resume normal production and inspect the finished bottles produced by the blow molding machines. Check whether the mold number matches the set mold number of the blow molding station, and test other different blow molding stations in sequence.

6.3.8 Pre-blown bottle test function experiment Turn off the main blowing function, turn on the pre-blowing function, run the blow molding machine to blow bottles at each station, and measure the diameter of the sample bottles at each station (or...). Calculate the deviation between the diameter (or diagonal) and height of the sample bottles blown at each station and the dimensions of the finished bottles.

6.3.9 Pre-blowing pressure and main blowing pressure deviation test

6.3.9.1 Pre-blowing air pressure deviation test Manually activate the pre-blowing test function, perform a pre-blowing test on each blow molding station, record the pressure at each station, and calculate the average. The pressure deviation is calculated bas...