Product Category

PET Bottle Blow Molding Machine

Process of Bottle Blow Molding Machine

1. The entire preform transfer

The automatic feeder loads the preform to the gripping position, and the gripping clamp removes the preform and enters the heating oven through the conveyor chain.

2. Pre-heating

The preform enters the infrared tube oven through the transmission chain for heating. The infrared oven has two rows of horizontal red-line lamps, and the temperature of each lamp can be adjusted by the micro-controller PLC. The upper and lower red-line lamps are stable at a constant temperature but different in height. In order to keep the bottle diameter unchanged, the bottom of the preform mouth is generally not heated. At the same time, because it is in a high temperature environment, the temperature is cooled through the dispersion tube in the chiller. The temperature from the middle of the preform to the bottom of the bottle is all thermostatically controlled. Because the hot gas evaporates upwards, the temperature of the bottom of the bottle is relatively low, otherwise it is easy to cause the bottom of the bottle to be too thin and cause the bottom of the bottle to rupture.

3. Blow into a bottle

The heated preform enters the mold clamping device for blowing. The hot preform enters the mold clamping device to seal the preform. Same as the pre-blowing gas, the stretching rod at the bottom stretches the preform upwards, pre-blowing the gas to a certain degree, blowing at low pressure, and at the same time entering the blowing at high pressure. In a very short period of time, the bottle is instantly formed at one time, and the bottle is blown. Before the pre-blowing of the gas, a cold dryer is usually installed. The gas passes through a filter to filter the moisture in the air and the oil in the equipment lubrication. The gas is clean, and the formed bottle has no oil smell. In addition, the hot preform in the mold closer will increase the heat of the mold and the temperature in the mold, which will affect both the bottle and the equipment. The chiller will ensure that the temperature of the mold drops quickly and ensure the quality and output of the bottle.

4. Recover extra gas

After the high-pressure and low-pressure gas in the bottle has been blown once, the exhaust of the gas will cause energy waste and increase energy consumption. By installing a gas recovery device, the pre-blowing gas and the blowing gas will enter the gas storage tank through the one-way valve , Can save 25% of energy consumption.

Types of PET bottle blowing machines

According to the different needs of customers, semi-automatic blowing machines and fully automatic blowing machines have been derived.Semi-automatic blowing machine that inserts preforms by hand and automatically takes out bottles.Fully automatic blowing machines including the linear stretch blowing machine and rotary stretch blowing machine,the difference is the rotary stretch blowing machine production speed is faster than linear stretch blowing.

Two important factors when choose pet automatic blow molding machine

1. Different specifications such as bottle radius, capacity, production capacity, etc., should be considered.

2. The reputation of the manufacturer. It is recommended to choose manufacturers with design capabilities and continuous research and development capabilities, as well as perfect after-sales services.

Xinmeiyuan Machinery focus on bottle blowing field for nearly 25 years, we can give the best suggestions for you.