Injection blow molding machine (injection blow molding machine) is a device that combines injection molding with blow molding process, and is mainly used to produce hollow plastic products, such as plastic bottles, containers, etc. The following is a detailed introduction from the two aspects of principle and characteristics:

Working principle of injection blow molding machine
The molding process of injection blow molding machine is mainly divided into three stages, and the molding of plastic is realized through the coordinated movement of mold and mechanical device:
Injection molding stage
After the plastic raw material (such as polyethylene, polypropylene, etc.) is heated and melted, it is injected into the parison mold through the injection device to form a tubular parison with a certain shape and thickness (similar to the prototype of a test tube).
This stage determines the basic structure and dimensional accuracy of the product.
Blow molding stage
The parison mold is opened, and the robotic arm transfers the parison to the blow molding mold and closes the mold.
Compressed air is introduced into the parison, so that the parison expands under the action of air pressure and adheres to the inner wall of the mold to form the desired hollow product shape (such as bottle body, container contour).
Cooling and demoulding stage
After the blow molding is completed, the product in the mold is cooled and solidified by the cooling system to ensure stable shape.
The mold opens, and the mechanical device takes out the molded product to complete a production cycle.

The main features of the injection blow molding machine:

process advantages and high product precision.
The size and weight of the parison can be accurately controlled during the injection molding stage. The air pressure is evenly distributed during the blow molding process, so that the wall thickness of the product is uniform and the dimensional error is small (such as the bottle thickness tolerance can be controlled within ±0.1mm), which is suitable for products with high precision requirements (such as medicine bottles, cosmetic packaging).

Excellent surface quality
The mold surface has high finish, the plastic melt flows evenly during the molding process, the product surface is smooth and seamless, and no post-polishing treatment is required. It is especially suitable for the production of transparent products (such as beverage bottles).
High material utilization rate
The injection blow molding process produces almost no waste (the parison size is accurate, and the material is evenly distributed during blow molding). Compared with traditional blow molding processes (such as extrusion blow molding), the waste of raw materials can be reduced by 10%~20%.High production efficiency
The injection and blow molding processes are completed continuously on the same equipment, with a high degree of automation and a short single cycle time (usually 10 to 30 seconds), which is suitable for mass production (such as dozens of products can be produced per minute).

Equipment performance characteristics:

multi-station collaborative operation.
Injection blow molding machines usually adopt a multi-station turntable structure (such as three stations: injection, blow molding, and demolding), and each process is carried out simultaneously to reduce standby time and improve production efficiency.Advanced automation control
Equipped with PLC (programmable logic controller) and touch screen operating system, it can accurately control process parameters such as temperature, pressure, and time, support recipe storage and one-button switching, and adapt to the production needs of different products.
Easy mold replacement
The mold adopts a modular design, and no complicated debugging is required when replacing. You only need to adjust the parameters to quickly switch product specifications (such as bottles of different capacities), which is suitable for multi-variety small batch production scenarios.

Application scenario characteristics: Suitable for small precision products, especially for the production of hollow products with a capacity of 10ml~2L, such as:
Medical field: oral liquid bottles, injection bottles (required to be sterile and accurate in size);
Daily chemical field: shampoo, lotion bottles (beautiful appearance, good sealing);
Food field: condiment bottles, beverage bottles (good barrier properties to prevent the contents from deteriorating).Products have strong functionality
Special properties of products can be achieved through process control, such as:
High barrier properties: Through multi-layer co-injection blowing process (such as PE+EVOH+PE), the barrier capacity for oxygen and water vapor is improved, and the shelf life of food is extended;
High strength: Reasonable design of bottle body structure (such as reinforcing ribs) to improve anti-fall performance.

Environmental protection and energy consumption characteristics:

 Low energy consumption operation, the heating system adopts energy-saving heating coils (such as electromagnetic heating), which can save more than 30% energy compared with traditional resistance heating, and the temperature control is more accurate.
Good environmental protection
There is no dust or exhaust gas emission during the production process, and the waste can be recycled and reused, which meets the requirements of environmental protection production.