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.
