2026 PET Semi-Automatic/Automatic Bottle Blowing Machine Operation and Maintenance: Comprehensive Guidelines for All Process Steps

PET semi-automatic/fully automatic blow molding machines are specialized production equipment used to heat PET preforms and blow-mold them into hollow plastic containers. In 2026, domestic packaging industry standards for blow‑molding production will continue to tighten. By mastering the key operational considerations across the entire process, equipment failure rates can be reduced by more than 30%, significantly boosting overall production efficiency. As a long‑standing manufacturer specializing in blow‑molding equipment, Taizhou Jiubao Machinery has distilled its frontline operational expertise into the following practical guidelines. For tailored solutions, please visit our official website at gb.cnjiubao.com.

Pre-Startup Precautions for PET Semi-Automatic and Fully Automatic Bottle Blowing Machines

Pre‑startup verification of PET semi‑automatic and fully automatic blow‑molding machines is a critical prerequisite for mitigating subsequent production risks. By 2026, mainstream manufacturing standards will require that at least three basic inspections be completed prior to startup.

Key Points for Pre-Worksite and Power Supply Inspections

First, ensure that the floor in the equipment installation area has a levelness tolerance of no more than 2 mm, that there are no flammable or explosive materials piled up nearby, and that ventilation and heat‑dissipation pathways remain unobstructed to prevent overheating of high‑temperature components from creating potential hazards. At the same time, verify that the supply voltage matches the equipment’s rated voltage, that the grounding connections are secure and free of looseness, and that the gas pressure is stable within the 0.8–1.0 MPa range, with no leaks in the piping system.

Requirements for Compliance Verification of Preforms and Consumables

Prior to production, verify the material identification of the PET preforms to be processed; do not use non‑compliant preforms containing recycled content exceeding the permitted limit. Inspect the preforms for defects such as cracks, material shortages, or visible stains to prevent bottle breakage during subsequent molding. Additionally, confirm that consumables—including lubricating oil and high‑pressure air filter elements—are within their expiration dates and have not been used beyond their shelf life.

Standardized Precautions for Starting Up PET Semi-Automatic and Fully Automatic Bottle Blowing Machines

The startup and commissioning of PET semi‑automatic or fully automatic blow‑molding machines must follow the prescribed sequence step by step; skipping the heating and preheating stages to start production directly is strictly prohibited to prevent damage to critical components.

Heating System Parameter Commissioning Specification

The heating zones should be matched to the wall thickness and gram weight of the preform being processed. For standard mineral water bottle preforms, the heating temperature is typically set between 90°C and 120°C, with a temperature difference across zones not exceeding 5°C. The preheating time should be maintained at 15–30 minutes to ensure uniform heating throughout the preform, thereby preventing uneven wall thickness after molding.

Mold-closing and bottle-blowing pressure calibration procedure

Complete equipment commissioning step by step according to the standardized procedures:

1. First, start the equipment and run it at no load for 3 minutes, ensuring that all drive components operate without abnormal noises or jams.
2. Set the mold‑closing pressure to 3–5 MPa and verify that the mold‑closing gap is tightly sealed with no misalignment.
3. First, perform low-pressure blow molding, then gradually increase the high-pressure to 2.5–3.5 MPa. Produce 3–5 trial bottles to verify the molding quality.

Precautions for Operational Safety of PET Semi-Automatic and Fully Automatic Bottle Blowing Machines

During continuous operation of the PET semi‑automatic or fully automatic blow‑molding machine, operators must remain on duty at their designated workstations at all times, refrain from leaving their posts without authorization, and implement comprehensive protective measures throughout the entire process.

Key Points for Mitigating Risks Associated with High-Temperature Components

During operation, the surface temperature in the heating furnace area can exceed 80°C. Operators must not directly touch high‑temperature components such as heating lamps and heating jackets. When changing preforms or taking samples, they must wear designated heat‑resistant gloves to prevent burns. Clear high‑temperature warning signs should be posted around the equipment, and unauthorized personnel are prohibited from approaching it.

Standard for Immediate Handling of Abnormal Faults

During operation, if any abnormal conditions occur—such as unusual noises, bottle breakage, or a sudden drop in pressure—immediately press the emergency stop button. Allow the equipment to come to a complete stop and cool down before troubleshooting. Under no circumstances should you reach into the mold‑closing area or the high‑temperature chamber while the machine is running to perform cleaning, to prevent mechanical injuries.

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Precautions During the Mold Debugging Phase of PET Semi-Automatic/Automatic Bottle Blowing Machines

When changing molds on PET semi‑automatic or fully automatic blow‑molding machines to accommodate products of different specifications, it is essential to perform precise alignment verification to prevent misalignment, which can result in defects such as flash and deformation in the finished bottles.

Mold Installation Alignment Verification Requirements

Before installing the mold, thoroughly clean any residual oil or foreign matter from the mold‑closing mating surfaces. Ensure that the alignment pins on the upper and lower halves are fully inserted into their respective locating holes. Tighten the clamping bolts progressively in a diagonal sequence. After installation, manually rotate the machine to verify that the mold opens and closes smoothly without binding or misalignment. Only proceed with equipment startup and trial production once compliance has been confirmed.

Adaptation logic for bottle-type parameters of different specifications

For small‑capacity bottles up to 500 mL, set the blow‑molding delay to 1–2 seconds. For large‑capacity plastic drums of 5 L or more, adjust the blow‑molding delay to 3–5 seconds and proportionally extend the cooling and pressure‑holding time by a factor of 2–3 to prevent deformation and sink marks caused by insufficient cooling.

Precautions for Daily Operation and Maintenance of PET Semi-Automatic/Automatic Bottle Blowing Machines

Regular maintenance and servicing of PET semi‑automatic and fully automatic blow‑molding machines can effectively extend the equipment’s service life. The following are reference data, based on field measurements conducted by Taizhou Jiubao Machinery in 2026, for the maintenance intervals of various machine models:

Reference for the Scheduled Replacement Intervals of Wear Parts

In daily production, maintain a ledger for the replacement of wear‑and‑tear parts, and replace components such as sealing rings, filter cartridges, and heating lamps on schedule. Do not allow these parts to remain in service beyond their recommended service life to prevent secondary failures such as air leaks or insufficient heating.

Key Points for the Storage of Long-Term Shutdown Equipment

If the equipment is to remain out of service for more than 7 days, drain any residual high-pressure gas from the interior, completely remove all remaining lubricating oil from the oil lines, apply anti-rust oil to metal components, install dust‑proof covers, and store the equipment in a dry, well‑ventilated area to prevent moisture‑induced corrosion.

Precautions Regarding Qualifications for Operators of PET Semi-Automatic and Fully Automatic Bottle Blowing Machines

Operators of PET semi‑automatic and fully automatic blow‑molding machines must undergo specialized technical training and pass the required assessment before commencing work; personnel without relevant experience are prohibited from operating the equipment at will.

Pre-employment Competency Assessment Requirements

Operators must be familiar with the equipment’s basic structure, operating procedures, and emergency stop locations, and possess fundamental skills for handling abnormal situations. Only after passing the assessment may they independently perform production operations.

Regular Training Implementation Guidelines

Manufacturing enterprises must conduct quarterly training on blow‑molding machine operation, update operating procedures, and provide cautionary briefings based on real‑world accident cases to enhance operators’ safety awareness.

Precautions for Troubleshooting PET Semi-Automatic and Fully Automatic Bottle Blowing Machines

When a PET semi‑automatic or fully automatic blow‑molding machine malfunctions, follow a standardized troubleshooting procedure step by step to avoid blindly disassembling components and causing additional secondary issues.

According to mainstream industry research, by 2026, more than 70% of blow‑molding machine failures will be attributable to improper operating procedures and inadequate routine maintenance—issues that can be effectively prevented through proactive preventive management.

Common Approaches to Tracing and Troubleshooting Bottle-Related Defects

If white spots appear on the bottle base, first check whether the preform heating temperature is insufficient. If flash occurs at the bottle mouth, first verify that the mold halves are properly aligned; troubleshoot and pinpoint the issue step by step, starting with the simplest causes and progressing to more complex ones.

Rigid Requirements for Power Disconnection and Lockout During Maintenance Operations

When performing internal maintenance on equipment, the main power supply must be disconnected, a “Under Maintenance—Do Not Close” warning sign must be posted, and a designated person must be assigned to monitor the power‑switch area to prevent accidental energization and related injuries.

This article was generated by AI and is for reference only.