Injection blow molding machine (injection blow molding machine) is a device that combines injection molding and blow molding, and is mainly used to produce high-precision, seamless hollow products. Its characteristics can be expanded from many aspects such as process principle, product performance, and production efficiency. The following is a detailed introduction:

1. Process principle and structural characteristics
Integrated molding process
The injection blow molding machine uses the integrated process of "injection molding bottle embryo → transfer to blow molding mold → blow molding", without manual intervention in bottle embryo transfer, reducing intermediate link losses.
The typical structure includes injection unit, mold moving mechanism, blow molding unit and control system, and each component has high collaborative precision (such as mold positioning error ≤ 0.1mm).
Speciality of mold design
The "injection mold + blow molding mold" double mold structure is adopted. The injection mold is used to mold the bottle embryo (including precision structures such as bottle mouth thread), and the blow molding mold determines the final shape of the product. The mold material is mostly corrosion-resistant steel (such as S136), and the service life can reach more than 500,000 times.

2. Product performance advantages
High precision and flawless
The bottle mouth has extremely high precision: the bottle mouth thread is directly formed by injection molding, the dimensional error is ≤0.05mm, the sealing is strong (such as beverage bottles can withstand 0.3MPa internal pressure without leakage), and no secondary processing is required.
No flash and seams: the material is evenly distributed during the blow molding process, the surface of the product is smooth, and the seam line is extremely fine (width <0.1mm), which is suitable for high-end packaging (such as cosmetic bottles, medicine bottles).
Wide material adaptability
Common materials include:
PET: used for mineral water bottles, carbonated beverage bottles (transparency ≥90%);
PP: used for microwave lunch boxes, baby bottles (temperature resistance ≥120℃);
PE: used for daily chemical products bottles (good flexibility, drop resistance >50J);
Special materials: such as EVOH (barrier material) used for edible oil bottles, oxygen permeability <0.1cc/day

3. Production efficiency and cost characteristics
High-speed automated production
Short cycle: The production cycle of small products (such as 500ml bottles) is only 8-12 seconds, and the production capacity of a single device can reach 3000-5000 bottles/hour, and supports 24-hour continuous operation (failure rate <0.5 times/thousand hours).
Fully automatic control: PLC + touch screen operating system, which can store more than 100 sets of process parameters, and the machine adjustment time when changing products is <30 minutes.
Energy saving and material saving
Compared with the traditional "injection preform + blow molding" two-step method, the injection blow molding machine does not need to reheat the bottle preform, and the energy consumption is reduced by 30%-40% (taking a 500ml bottle as an example, the two-step method consumes 0.12kWh per bottle, and the injection blow molding machine only consumes 0.07kWh).
The product wall thickness is uniform, and ultra-thin design can be achieved (such as 0.3mm wall thickness mineral water bottle), the raw material loss rate is less than 1%, and the material saving is 15%-20% compared with ordinary blow molding machines.

4. Targeted application scenarios
High-demand packaging field
Medical packaging: PP medicine bottles formed by injection blow molding meet GMP standards, without the risk of impurities falling off, and are suitable for tablet and capsule packaging (such as amoxicillin medicine bottles).
Food and cosmetics: PET injection blow bottles have high transparency and good barrier properties, and can be used for essence and perfume packaging (light-proof models need to add light-shielding masterbatch).
Complex structure products
Products with handles, special-shaped cross-sections (such as oval bottles, square bottles), and multi-layer structures (such as PE+EVOH composite bottles) can be produced without post-processing and assembly.

5. Comparison with Injection Stretch Blow Molding Machine (Core Difference)
Features Injection Stretch Blow Molding Machine Injection Stretch Blow Molding Machine
Stretching Process No longitudinal stretching Including longitudinal stretching (molecular bidirectional orientation)
Product Strength Ordinary strength (impact resistance ≤ 30J) High strength (impact resistance ≥ 80J)
Transparency General (PET bottle transparency 85%) High (PET bottle transparency above 92%)
Applicable scenarios Products with low strength requirements Beverage bottles, packaging bottles that need to withstand high pressure

6. Limitations
High equipment cost: The price of injection blow molding machine is usually between 150,000 and 800,000 yuan (such as about 300,000 yuan for 500ml model), which is 30%-50% higher than ordinary blow molding machine.
Product capacity limit: The production capacity of mainstream models is 5ml-2L, and other processes are required for ultra-large capacity products (such as 5L buckets).

Summary
The core advantages of injection blow molding machine are "high precision, high efficiency, and low loss", which is especially suitable for scenes with strict requirements on bottle mouth precision and product appearance. If you need to produce high-strength and high-transparency beverage bottles, you can give priority to the injection-stretch-blow machine; if you focus on precision packaging such as medicine and cosmetics, the injection-blow machine is more suitable. The specific selection needs to be comprehensively evaluated in combination with product demand and capacity planning.