Zhangjiagang Tongda Machinery Co., Ltd

Plastic is a versatile material that is often manipulated into the most unnatural shapes. These shapes become toys, household tools and décor, manufacturing components and even automotive parts. Manufacturers create the many shapes using a technique called molding. One of the most efficient molding methods is blow molding.
Other Types of Molding
To mold plastic, you must melt it and then somehow place it into a mold. Injection molding involves squirting the plastic in, while casting is pouring the plastic into a mold. Blow molding is like injection molding as the plastic is squirted into the mold. But, the plastic is followed by an injection of air that pushes the plastic to the insides of the mold, according to Pennsylvania State University’s Engineering Science and Mechanics Department. The liquid plastic keeps expanding until it covers the interior walls of the mold.
Less Expensive than Other Methods
According to Proven Technology Inc., an industrial blow molding equipment consulting service, the blow molding technique is the least expensive of the plastic molding methods. It uses the least amount of plastic and results is little waste. The molds used for blow molding are also less expensive than other injection molding parts, according to Partner in Plastics, a manufacturer that uses blow molding techniques.
Product Versatility
The blow molding method creates a very thin plastic product. The air injection also forces plastic material into all crevices that the mold has. These two traits make blow molding the best technique for creating complex shapes that are irregular and hollow. Proven Technologies also states that blow molding allows for a double wall within plastic products, increasing strength in the oddest shapes.
Faster Production
The extremely thin plastic dries faster than cast molded and even other injection molded products. There is simply less material to dry. The injection is also quick because of the small amount of plastic used compared to other molding methods.
Jet Pulverizer Systemswww.jetpulverizer.com
Dry Grinding & Size Reduction Jet Pulverizers made in the USA

According to the China Plastic Machine Industry Association statistics show that during the first half of 2011, China’s plastics machinery industry output value reached 22.543 billion yuan, an increase of 27%. Among them, export delivery value reached 3.712 billion yuan, an increase of 43%. The main types of export products is injection molding machines, extruders, blow molding machine, blow molding machine, rolling machine, etc., which presses the device’s major export volume and value growth to achieve double, respectively, 24,121 units and $ 670 million, up increased by 16% and 38%.
Imports, since the second quarter, reducing substantially the number of imports, in the first half imports fell 19%, but imports 23% of the amount remains the rapid increase, which indicates that the average unit price of imports has improved.
The most typical plastic calendering machine, the first half of 2011 imports rose nearly 2 percent, but imports value increase of up to 155%. The injection molding machine plastic machine as the main products of this situation, first half of 2011, China accounted for the injection molding machine plastic machinery equipment imports 67% of total imports, imports amounted to 40%. Although imports fell 12%, but the amount of an increase of 4% of imports. In the first half, China’s export volume and value of the injection molding machine, respectively, year on year growth of 46% and 49%.
From the analysis of sources of imports, first half of 2011, China from Japan, Germany, China Taiwan, Italy, Korea, the United States, Austria, Switzerland, France, The Netherlands imported 10 countries and regions the number of presses and the total amount of imports over the same period accounted for and the total amount of 97.32% and 94.93%.
Although a quarter of Germany surpassed Japan to become the largest of China’s major import sources presses products, but with the Japanese press in the second quarter, industry recovered from the whole first half of 2011, Japan remained China’s largest plastic machinery products source of imports, and imports fell 36.76% in the case, but the amount of imports from Japan increased by 12.62%.
In addition, the top 10 sources of imports, the Netherlands is the fastest growing countries. First half of 2010, China imported from the Netherlands only the amount of $ 03,700, while the amount of imports over the same period in 2011 increased to $ 14,017,300.

Q: how can we eliminate the HDPE blown film process in the pattern, I do not know how to do it usually is, or improved formulations, or improve the ability of plasticizing screw tube, I hope you post some selfless own experience, so that we can upgrade their technology. I will say some of their own experience.
Answer 1: There is no pattern handle clean water is not the reason?
2: Is the so-called “shark skin” phenomenon! Should be a part of melt fracture.
Reason: because the melt flow in the cylinder, the cylinder wall and the wall there are differences between the flow rate, while leaving the die mouth, the whole being melt was not any resistance, the gap between the two zero. Is the relative velocity layers change, causing the mouth melt flow mode, generating a strong oscillation, leading to a phenomenon!
The solution:
1, adding additives: additives such as organic silicone type (silicone plastic additives) or with Vladimir polymer additives (PPA).
2, an appropriate increase in temperature can also increase the melt flow!
  HDPE film blowing, sometimes because of the temperature, sometimes because of the type of raw materials to problems of more or less the pattern, but sometimes that is increasing the height of the temperature, changing the model is still somewhat plastic. Once the wind tried to film ring head elevated, or that raise, but really a bit useful, this is what works.

While PET bottle development was proceeding in the US, a large manufacturer of injection moulding machines in Japan, was leading a project to develop a machine to make biaxially oriented PP ( polypropylene) containers. They recognized that the prototype machine could be used to produce the new PET bottles and, in December 1975, the One stage ASB 150 injection stretch blow moulding machine for making the new biaxial oriented PET bottles was unveiled. All one stage injection stretch blow moulding machines derived from this original Stretch Blow design are referred to as classic one stage machines, as the concept has long since been extended into other PET developments. The classic one stage machines design is extremely versatile in that the same basic machine design can be used to make a wide variety of bottles and jars in all shapes and sizes, which was the standard single stage machine in the early years, had eight cavities for 1.5 litre bottles.

The preform defines the neck detail, weight and overall height of the final bottle. Changes to blow mould shape, provided it fits in the blow mould block width can be accommodated. This can include slight ovalization, panels and changes to the shoulder area. With quick connectors it is possible to change a blow mould in advanced machine in 20-30 minutes. If alternative bottles are required, it should be specified at the start of a project so that it can be incorporated in the mould design.

Yes PET is recyclable. One of the striking features of the material is its recyclability. Post-consumer containers are collected from households and processed to make raw material for new applications. The resulting resin is the raw material used to make containers. PET can be recycled to a wide variety of methods: melt reprocessing, molecule break down (de-polymerisation), purification and re-polymerisation and through energy recovery. Mechanical recycling of PET bottles requires washing and grinding of recovered material. Chemical recycling is another established method for recovering reclaimed post-consumer waste.

There are two types of PET Blow Moulding machineries

• Fully Automatic Pet Blow Moulding Machine
• Semi Automatic Pet Blow Moulding Machine

Fully Automatic Pet Blow Moulding Machine

Fully Automatic Pet Blow Moulding Machine is equipped with fully electrical automatic preform loader & LCD display programmed with high speed Microcontroller for easy operation.

Semi Automatic Pet Blow Moulding Machine

Semi Automatic Pet Blow Moulding Machine is equipped with built-in automatic microprocessor, pneumatic cylinders & Valves Pressure reduction adjustable valve controls the speed of the stretching & die operations.
Use of Pet Blow Moulding Machine
Fully Automatic Pet Blow Moulding Machine and Semi Automatic Pet Blow Moulding Machine are useful in manufacturing Pet bottles and jars used for Mineral & Distilled water and also to make containers for

• Packaging Goods
• Edible Oil
• Pesticides
• Pharmaceuticals
• Carbonated Soft Drinks
• Liquor
• Cosmetics and Confectioneries
• Candy
• Sauce
• Juices

PET Blow molding or PET blow moulding is a manufacturing process used in the plastics and polymers industries in which hollow plastic parts are formed. PET Blow molding is a process of inflating a hot, hollow, thermoplastic preform or parison inside a closed mold so its shape conforms to that of the mold cavity.

Blow moulding machine for forming a bottle having a calibrated neck finish

An extrusion blow moulding machine for forming a bottle having a calibrated neck finish from an extruded parison, including a blow pin assembly comprising a blow pin tip that comprises (a) a plurality of orifices around the circumference of the blow pin and adjacent the base of the bottle neck to help spread the parison material around the neck and assist in cooling and (b) oval cut-outs positioned in line with the parting line of the mold to receive excess material and reduce push-down of excess material at the base of the bottle neck.

Containers and other hollow articles are frequently formed by blow molding. The blow molding process involves providing a tube of heated and softened plastics material (parison) about which a two-piece mold is closed. Air or another gas is introduced under pressure into the parison to expand it against the walls of the mold, forming the desired hollow article. Such blow molding machines can be of various types, the most common of which are extrusion-blow mold machines and injection-blow molding machines.

More specifically, in the extrusion-blow molding process, the blow moulding machinery is closed over the parison pinching off (closing) the ends of the tubular parison. Air or another gas is injected inside the parison through a blow pin, expanding the parison to match the mold cavity. Obviously, the mold in this process controls only the shape of the outer surface of the bottle, including the neck. Since the outer surface of the neck has an irregular contour to facilitate use in dispensers or water coolers, the corresponding inner surface is also irregular since the material forming the inside wall is not constrained, resulting in varying wall thickness that further distorts as the bottle cools to ambient temperature.

In summary, the method and apparatus defined by the present blow moulding machine facilitate production of economical, easily cleaned water bottles from a wide range of materials. Advantages to the water bottle industry are the wide range of plastic materials that can be used and the range of neck sizes that can be suitably formed. Another achievement is producing the straight inner diameter of the neck that facilitates total cleaning during bottle recycle.

blow moulding machine blow molding machines blow moulding machinery

To learn more about this article, kick here: http://tongda8.livejournal.com/

An extrusion blow moulding machine, including several molding units borne by a carrousel rotating about a substantially vertical axis (A1), wherein each molding unit is mounted on the carrousel such that it can be tilted about a substantially horizontal axis.

More particularly, it concerns blow moulding machinery provided with several molding units carried by a carrousel that is rotatable around an appreciably vertical axis. In a known way, each molding unit has a two-part mold, both parts being movable with respect to each other between an open position and a closed position.

The blow mold machine described in this document has molding units that can slide vertically with respect to the carrousel between an upper working position and a lower retracted position. Immediately after a molding unit has seized a section of preform, and until this unit has been released below the extrusion head by rotation of the carrousel, the molding unit is moved toward its retracted position. This makes it possible to prevent the preform from spilling over onto the upper face of the mold during extrusion in a situation in which the preform or preforms are continuously extruded.

A purpose of the blow moulding machines, therefore, is to propose an improved design of a machine of the type described above, this design allowing machines to be produced that have a high rate of production.

To that end, the invention proposes a machine of the type described above, characterized in that the molding unit is mounted on the carrousel in order to be able to tilt around an appreciably horizontal axis.

The provision of tilting molding units is particularly beneficial because of the very small increase in height that this involves for the machine. In addition, a pivot connection can easily be made between the cradle and the base , which is particularly rigid, to ensure the perfect positioning of the molding unit with respect to the blow-molding units and the extrusion head .

Thus, the blow molding machine according to the invention makes it possible to expect high operating speeds while still being perfectly reliable.