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Plastic Blow Molding Machine

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It is a machine for blowing bottles. The simple explanation is a machine that can blow plastic particles (softened into a liquid) or prepared preforms into a bottle through a certain process.


1 English name

English name: Blow Molding Machine or Blow Moulding Machine

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2 Features

Plastic hollow containers are widely used in the beverage, medicine, cosmetics, food and chemical industries due to their light weight, low price, and high safety. It has attracted more manufacturers to choose plastic containers instead of glass containers. Today's advanced equipment, molds and raw materials in the plastics industry are all presented in front of us. New technologies and new applications are emerging endlessly, and the field of plastic hollow molding is also fruitful. With the world oil price soaring, the price of plastic raw materials is also high, and the development of alternative products with low energy consumption and raw materials is also one of the market trends.

· Using oil-free airbag mold clamping technology, the clamping force is large, and the force of the elbow joint is small, and the life is long. · Fly-out sealing technology is used to make sealing, especially for wide-mouth bottles, easier. · Using Keyence PLC and touch screen, easy operation and high reliability.

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3 definitions

Blow molding machine is a kind of equipment for making plastic granules into hollow containers by blow molding process. At present, the more common types include hollow extrusion blow molding machines using PP and PE, and PET, PC or PP molding twice. Injection stretch blow molding machine, and newly developed multi-layer hollow extrusion blow and stretch blow molding.

At present, most of the blow molding machines are two-step blow molding machines, that is, plastic raw materials must be made into preforms before blowing. PET plastics are commonly used today. Blow molding machine: After the liquid plastic is sprayed out, the plastic body is blown to a certain shape of the cavity by using the wind blown by the machine to make a product. This machine is called a blow molding machine. It is also a type of blow molding machine, that is, a hydraulic blow molding machine.

The tubular plastic parison obtained by extrusion or injection molding of a thermoplastic resin is placed in a split mold while it is hot (or heated to a softened state). After the mold is closed, compressed air is passed into the parison to blow the plastic parison It swells tightly against the inner wall of the mold, and after cooling and demolding, various hollow products are obtained.

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4 Craft history

Enoch Ferngren and William Kopitke first validated the blow molding process. The principle of this process is derived from glass blowing. In 1938, Ferngren and Kopitke built a bottle blower and sold it to Hartford Empire. This is the beginning of the commercial blow molding process. In the 1840s, the variety and quantity of plastic products were very limited, so the blow molding process did not develop rapidly until very late. With the increase of product types and the increase of productivity, more and more plastic products made by the blow molding process soon. In the U.S. soft drink industry, the number of plastic containers has grown from zero in 1977 to 10 billion in 1999.

The blow molding process was used to produce low-density polyethylene vials during World War II. In the late 1950s, with the birth of high-density polyethylene and the development of blow molding machines, blow molding technology was widely used. The volume of the hollow container can reach thousands of liters, and some production has been controlled by computer. Plastics suitable for blow molding include polyethylene, polyvinyl chloride, polypropylene, polyester, etc. The hollow containers obtained are widely used as industrial packaging containers.

According to the parison manufacturing method, blow molding can be divided into extrusion blow molding and injection blow molding. Newly developed are multilayer blow molding and stretch blow molding.

The extrusion process is to extrude the plasticized plastic into an extrusion blow die through a screw, and then cooperate with the following mold and compressed gas to achieve product molding.

The extrusion blow molding process consists of 5 steps: 1 plasticized raw materials are made of the plasticized raw materials; 2. part of the parison is cut off and the parison is cut off by closing the mold; 3. gas is filled into the mold cavity The embryo is formed and cooled; 4. Open the mold and take out the formed container; 5. Trim the flash to obtain the finished product.

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5 course

First, warm up

The preform (embryo) is irradiated with an infrared high temperature lamp, and the preform (embryo) body part of the preform (embryo) is heated and softened. In order to maintain the shape of the bottle mouth, the preform (embryo) mouth does not need to be heated, so it must be heated. Cooling device for cooling operation.

Blow molding

At this stage, the preforms (preforms) that have been preheated are placed in a blow mold that has been prepared, and the high-pressure inflation is performed on them to blow the preforms (preforms) into the required bottles.

Bottle blowing machines on the market are generally divided into two types: fully automatic and semi-automatic.

The fully automatic bottle blowing machine completes the two operations of bottle blowing through the operation of the robot, eliminating the process of manually putting the preheated preform (embryo) into the blowing mold in the middle. Greatly speed up the production rate, of course, the price is higher than the semi-automatic.

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6 product selection

How to choose the model of blow molding machine you need is also a topic that everyone pays attention to.

Generally, choose the model of the blow molding machine according to the product you need. For manufacturers with different dosages, the general concerns are the number of cavities, the capacity of the bottle, and the hourly output.

It is very important to choose the model that meets your needs by your needs. Today, there are quite a few domestic manufacturers of blow molding machines. Selecting a good brand manufacturer on the basis of a reasonable price should also be the key to consider. The larger domestic manufacturers of blow molding machines are mainly concentrated in Taizhou, Zhejiang. In addition, many manufacturers have the ability to design and produce independently. They can customize the required models according to customer requirements, and have a large plant to allocate the processing and production of various components. In addition, a good after-sales service system provides customers with intimate Technical support.

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7 operating steps

Step 1: Place the preform in a preform container and automatically enter the preform positioning device via the conveying device.

Step 2: The preform mouth is automatically loaded on the preform holder and then sent to the drying tunnel.

Step 3: After heating, the preform is sent to the blow-pull platform, and then the mold is locked. The low-pressure blow-pull, high-pressure blow-pull, exhaust, and then open the mold.

Step 4: Bottles are removed from the blowing platform by an automatic demolding system.

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8 Technology Development

Beverage companies have two major needs for bottle blowing equipment. One is that due to the continuous rise in the price of plastic raw materials, beverage companies do not want to reduce packaging costs to maximize profits, so they need to use advanced bottle blowing equipment to produce lighter weight. Secondly, due to the rapid changes in the market, beverage manufacturers must respond flexibly to the shorter and shorter life cycle of beverages. Corresponding to this is the increasingly frequent product update problem in the production of PET bottles. During the production process, Need to reduce the time to change the mold to a low level. These two major needs pose a big problem for the supplier of blowing equipment.

Closed loop technology refers to integrating the process parameters of the line verification into the process control system of the stretch blow molding machine to form a closed production cycle process that combines automatic control and automatic adjustment. Intelligent machine control technology aims to improve the quality assurance system of the blow molding machine. Through the use of the AgrPETWallplus monitoring system, various data such as bottle wall thickness can be monitored. During work, the data deviating from the system rating will be immediately identified, and this information will be transmitted to the control system of the preform heating unit of the blow molding machine in a timely manner. The control system will quickly reflect and individually control each heating lamp in the heating furnace Rating. Therefore, even if the data of each bottle is different, the quality of the bottle produced is still stable and reliable under the condition that the initially set process parameters remain unchanged.

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9 Maintenance

1 Feeding level without feeding: There are several situations that need to be checked:

Whether the hopper is out of material, if it is: you need to add the material quickly

No: Please check if the control contactor of the hoist is in the energized state. If it is in the energized state, quickly check whether the motor is in the energized and loaded state, because the preform is likely to be stuck by the preform Belt, the simple way at this time is to help lift manually.

If it is checked that the control contactor of the hoist is not energized, check whether the preform detection sensor is not on the same line as the reflector.

2 Feed the old card feed tray: This situation is a headache. From experience, if the length of the preform (embryo) is longer and the weight is larger, then this phenomenon is relatively small.

3 The bottle cannot be removed from the mold after blowing.

First, the mold should be opened, and the mold should be opened and closed manually. If it is normal, run it in the dry running state, if it is normal.

Please check your exhaust time setting. If the exhaust setting is normal and the blow-up bottle fails every time, it can be judged that the exhaust valve is a problem. Please open the exhaust valve to check the condition of its springs and seals (this Another kind of failure is that the exhaust sound is relatively loud or there is an unclean sound).

If you encounter a situation where a lot of molds are produced normally and you can't open the mold, please check if there are screws in the clamping pin, and also check if the clamping force is too large. Standard readjusted.

4 Bottles are always pinched

Whether the position of the robot is out of position.

5 Two robots collide

This situation requires manual resetting of the robot, which is caused by misalignment

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10 operating specifications

Essential knowledge for safe operation of automatic bottle blowing machine

(1) Lubricating oil must be applied to each moving part before each shift is started. (Manipulator, manipulator guide, mold opening and closing guide)

(2) Swing arm can be added once every day (3-4). Warm machine large chain and small chain can be once a month. Check the main engine reducer and heater reducer frequently for oil shortage. The main bearing can be added once every 3 months.

(3) Before production, check whether the moving parts are firm, whether the screws are loose and fall off, especially where the impact force is strong, and whether the belt drive part is abnormal.

(4) Check whether the high-pressure gas source, low-pressure gas source, power source, and water source are normal.

(5) Check whether each emergency stop switch, safety door switch, and protection device detection switch are normal.

(6) Check whether the heating head enters the embryo and whether the embryo is working properly. If the insert is not in place, the nut can be adjusted.

(7) Check whether the lamp is damaged or broken. Replace it in time.

(8) Check whether each pneumatic component leaks air and whether the action is sensitive.

(9) Check whether the triplet is leaking abnormally, whether it is blocked, and whether the water storage capacity of the water cup is too full.

(10) When there is an abnormality in the solenoid valve of the automatic blow molding machine, it should be cleaned in time (cleaning once every 3.5 million bottles).

How the blow molding machine works

The blow molding machines are mainly divided into three categories: extrusion blow molding machines, injection blow molding machines and special structure blow molding machines. The processing technology is mainly divided into two kinds of one-step method and two-step method. One-step and two-step blow molding machine molding process, mainly used for PET and BOPP hollow container molding. Both have their own characteristics and are widely used. In comparison, the two-step method is more suitable for centralized production of preforms and dispersed blown bottles; and the one-step method is more suitable for online production of beverage companies.
The blowing process of the bottle blowing machine mainly has 6 steps: 1) first put the heated plastic embryo into the mold; 2) use the clamping cylinder to tighten the mold; 3) use high pressure or mechanical structure to make the mold Locking; 4) Pre-blowing at medium and high pressure, while stretching the cylinder to expand the mold; 5) High-pressure blowing, the preform is shaped according to the mold, and the pressure is maintained for a certain period of time; Reset-remove the bottle.

Pneumatic equipment is used in many places during the operation of the blow molding machine; from unloading-locking-stretching-high-pressure blowing \ deflation-taking bottles, this series of actions are assisted by pneumatic equipment. For example, if you stretch the high-pressure blowing and deflating circuit, as shown in Figure 2, we can see that the gas path is divided into two parts, the atmospheric part and the high-pressure part.

Improvement of Delta Pneumatic Equipment for Blow Molding Machine
In this system, Delta's pneumatic products can greatly improve the system in the normal pressure part. We recommend using Delta's pneumatic equipment:
1) Solenoid valve: Delta YSVF3000 \ 5000 series.
Its characteristics are: large solenoid valve flow; high life-more than 50 million times; the pilot adopts dual intake structure, strong environmental resistance; beautiful appearance.
2) Cylinder: Delta YCA3 series; large cylinder YCS1 series, YCQ2 series, YMB series; rodless cylinder (door opening cylinder): YPL series; swing cylinder: YMSQ series.
Its characteristics are: for the high speed of the bottle blowing machine, the use environment is poor, etc., the cylinder's dynamic sealing ring is changed to a PPD sealing ring structure, this sealing ring will be automatically compensated after high-speed gas pressure, thereby reducing the sealing ring and the cylinder wall Contact pressure increases cylinder life.
3) Air Gripper: YCHB series, YCHA series.
Its characteristics are: complete variety, high quality and high cost performance.
4) Filtration part: YAC series; YAFF and YAMG series products.
Its characteristics are: low power, energy saving and environmental protection, and long product life.

References

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