The factors affect the bottle blowing machine
have bottle preform and its heating, blow (
Position, pressure, and flow)
, stretching rod, high-pressure blow,
And mould, etc.
Below small make up just tell you to detailed.
1, bottle preform billet is known as the parison, is PET pellet injection molding, it requires no more than 10% recycled material, recycling number cannot be more than twice.
Injection molding mold or heating of the reoccupy after mold must be cooled more than 48 h, and use the bottle preform storage time can't more than 6 months, different production date, especially long interval bottle preform cannot mix, the main reason is that bottle preform materials model, with the proportion of secondary material and residual stress caused by different bottle preform, and these factors on the bottle blowing molding process has significant influence, should according to actual circumstances, specific treatment.
2, heat the bottle of billet heating are done by the heating furnace, by artificial setting, automatic adjustment.
It is advisable to the height of the heating furnace in 25 mm or so, from the transmission wheel 19.
About 6 mm.
Bottle preform on the transmission wheel continuous run through the whole oven, this bottle of billet is heated more evenly, can better molding, overcome the bottle preform before static heating, the shortcomings of manual rotation and uneven heating.
But heating furnace, such as improper adjustment, can cause blowing bottle wall thickness distribution uneven (up and down
As light under heavy)
Greaten, bottle products defects such as overweight, stiff neck, even cause torsion failure of mechanical components.
The company mainly produces automatic bottle blowing machine.
Bottles of billet heating temperature generally set is 85 -
120 ℃, colorless bottle preform, belt color bottle preform is lower.
Temperature setting too high or too low will cause product defects, such as broken, white fog, etc.
Regions of temperature can be adjusted according to the forming conditions of the products detailed, at the same time to consider oven lamp open situation.
In addition, oven output power setting is has a great influence on a bottle of billet heating, it controls the whole oven heat output.
When long-term don't boot, boot up again, the initial output power should be set corresponding higher, the normal production process and reduces gradually to normal state, the output power is usually about 80% advisable, especially when the environment temperature below 5 ℃, the effect is more significant.
Bottle blowing production technology and production environment temperature also has a certain relationship, general environment temperature to room temperature (
22 ℃ or so)
It is advisable.
If temperature is too high, the products solidifying point is seen agglomeration;
Temperature is too low, the machine starts up product performance is not stable, specific operation according to the actual situation and experience to regulate.
3, the role of preliminary forecast wind in blowing process is to make the bottle preform begun to take shape, at the same time by stretching rod longitudinal stretching increase the longitudinal strength.
The whole process is pre blow CAM in the process of bottle blowing pushing three-way valve to blow position, and the one-way valve to cooperate to complete.
Preliminary blowing position, pressure, and flow can affect the quality of the bottle.
Preliminary blowing location in advance, will appear at the bottom of the bottle center deflection, thinning, the foot wall thickness unevenness and pale, weight light, stiff neck, even at the bottom of the penetration defect;
Blow after the fault location, will appear under the light on the defects such as weight, center of thickening, sag.
Gas flow blowing air flow is controlled by a one-way valve, usually 3 - open
It is advisable to four laps.
The center of the bottom of the gas flow is big, heavy, thin, slant, foot white, wall thickness unevenness;
Center of gas flow is small, thick, piecewise excess weight.
Pressure blowing pressure at 0.
It is advisable to 1 mpa.
Under high pressure, may cause the heavy light, center deflection, the foot wall thickness unevenness, white, etc. ;
At the bottom of the pressure is low, not fully stretched, heavy, center of thick.
Bottle foot, the center of the molding situation has the greatest effect in the quality of the bottle, improper adjustment is often caused by blasting bottle (
Under the condition of normal experiment)
And the fatal defects such as leakage.
4 the effect of high pressure and high pressure wind makes molten material at full stretch, close to the mould wall, make the bottle full forming, carries on the transverse tensile at the same time, improve the transverse strength.
Its position and pressure were the major influencing factors.
High pressure air pressure is commonly 3.
4 mpa, which is by the molding characteristics and filling beverage (
The nature of the decision.
Its location, there are two, that is, the location and the location of the exhaust of high pressure gas, between the time for the molding of the holding time, the length of this period of time has a great influence on the stability of the bottle capacity.
High pressure air, easy to make the bottle shape and the shortage of foot to blow.
5, stretching rod stretching rod is in advance at the same time in conjunction with the pre blow the bottle preform stretching after heating device, reset before it after high-pressure blow and exhaust.
Stretching rod must be smooth vertical movement up and down in the bottle blowing process, and driving pressure of 0.
The clearance between the bottom die and 8 mpa, to 2.
5 mm, which is a third - bottle preform thickness
Clearance is too large, can cause bottle center migration;
Gap is too small, thinning of the center.
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