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What reasons will affect the production speed of fully automatic blow molding machines
Edit:Taizhou Huangyan Yige Machinery Co., Ltd.   UpDate:2019-07-31

Preforms of automatic blow molding machines and their heating, pre-blowing (orientation, pressure and flow), stretching rods, high-pressure blowing (pressure, orientation), and molds are all factors that influence the bottle-making machine to make bottles in the process.

Preform

Preforms, also called parisons, are PET pellets that have been injection molded. It pleads that the share of recovered materials cannot exceed 10%, and the number of withdrawals cannot exceed two. The preforms after injection molding or the preforms that are reused after heating must be cooled for more than 48 hours, and the storage time of the preforms used must not exceed 6 months. The different consumption dates, especially the preforms that are too long, cannot be mixed. The main reason is It is caused by different raw material types used in the preform, the proportion of the secondary material mixed in and the remaining stress in the preform. These factors have a serious impact on the molding process of the blow molding bottle, and should be treated according to the actual situation.

2. heating

The preform heating is completed by a heating furnace, which is manually set and automatically scheduled. The height of the heating furnace is preferably about 25mm, and it is about 19.6mm away from the conveying wheel. The preform continuously works through the entire oven on the delivery wheel, so that the preform is heated more uniformly and can be better formed, which suppresses the shortcomings of the preform that stopped heating and manual rolling and was unevenly heated. However, if the heating furnace is not adjusted properly, the wall thickness of the blown bottle will be unevenly spread (such as light and heavy), the bottle mouth will become larger than the standard, and the neck will be shortcomings, which will cause the torsion of the mechanical parts. The temperature in each area can be adjusted according to the molding situation of the product. Let's consider the open condition of the oven lamp. In addition, the setting of the output power of the oven also has a great influence on the heating of the preform, which controls the heat output of the entire oven. When it is not turned on for a long time, when it is turned on again, the initial output power should be set correspondingly higher, and then gradually reduced to the normal state during normal consumption. The output power is generally about 80%, especially when the ambient temperature is below 5 ° C. The effect is more significant.

Blowing bottle consumption process and consumption environment temperature also have a certain relationship, the ambient temperature is generally room temperature (about 22 ℃) is appropriate. If the temperature is too high, the product tends to appear agglomerates; if the temperature is too low, the product performance is unstable when the machine starts, and the specific operation should be scheduled according to the actual situation and warp direction.

3.Pre-blowing

The role of pre-blowing in the blowing process is to make the preform take shape, and to stretch its longitudinal strength by stretching the rod together. The whole process is that the pre-blowing cam pushes the three-way valve to the pre-blowing position during the blowing process, and is completed by the check valve. Pre-blow orientation, pressure and flow can all affect bottle quality.

Orientation: The pre-blowing orientation is advanced, and the center point of the bottom of the bottle is skewed and thinned. The wall thickness of the feet is uneven and whitish. It will show disadvantages such as light up and down, heavy center point, and depression.


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