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Injection blow Moulding
Injection Stretch blow Moulding
Extrusion blow Moulding
Injection molding is a method to obtain molded products by injecting plastic materials molten by heat into a mold, and then cooling and solidifying them.
The method is suitable for the mass production of products with complicated shapes, and takes a large part in the area of plastic processing.
Advantages Of Injection Molding
Fast production and highly efficient
Low labor costs
Large material choice
Low scrap rates
Ability to include inserts.
Good color control
Reduced finishing requirements
INJECTION BLOW MOLDING
Blow molding is the process of inflating a hot, hollow, thermoplastic preform or parison inside a closed mold, so its shape conforms to that of the mold cavity. A wide variety of blow molded hollow parts, including plastic bottles, can be produced from many different plastics using this process.
Within the injection blow molding process, the material is injection molded. The hot material, still on the core pin, is then indexed to the blow molding station where it is blown into a bottle and allowed to cool. The bottle is then indexed to the next station and ejected. Injection blow molding allows more precise detail in the neck and finish (threaded) area than extrusion blow molding. Little improvement in physical properties is realized in the injection blow molding process since very little orientation occurs.
Advantages Of Injection Blow Molding
High Dimensional Accuracy
Mass Scale Production
Injection Molded Neck
Low Weight Fluctuation
Good Material Distribution Consistency
Low Weight Fluctuation
High Cavitation Capability with Smaller Bottle Sizes
Blow Molding Materials
The thermoplastic raw materials that are utilized within the blow molding process come in the form of small pellets or granules, which are first melted and formed into a hollow tube, called the parison. Blow molded parts can be formed from a wide range of thermoplastic materials, including:
Acrylonitrile Butadiene Styrene (ABS)
ABS is well-suited for housings, containers, and other household goods. However, ABS lacks the superior chemical resistance of other common blow molding plastics.
High-Density Polyethylene (HDPE)
HDPE’s desirable physical properties—including chemical resistance, temperature resistance, and a high strength-to-density ratio—make it one of the most popular blow molding materials. HDPE is easily molded and suitable for both consumer goods and industrial applications, including a wide range of bottles and containers.
Low-Density Polyethylene (LDPE)
Compared to HDPE, LDPE is softer and more flexible, making it an excellent choice for plastic bags and flexible packaging such as squeeze bottles. LDPE and HDPE do share some properties, such as being chemically inert and easy to mold.
Acrylonitrile Butadiene Styrene (ABS)
PP is another widely-used, versatile molding plastic that resembles HDPE in many ways. The main difference is that PP is stiffer, less dense, and resistant to very high temperatures.
PS is sometimes better recognized as the chief component of Styrofoam, but in its solid form it is a rigid plastic useful for cases, food containers, and laboratory equipment. While very cost-effective, PS is notably brittle, so it will likely be a poor choice when durability is a concern.
PU is easy to mold and useful for a versatile range of products used in industrial facilities or marine environments. It is rigid and available in temperature-resistant varieties, which makes it a popular choice for difficult working environments.
Stretch Blow Molding
This blow molding process involves the production of hollow objects, such as bottles, having biaxial molecular orientation. Biaxial orientation provides enhanced physical properties, clarity, and gas barrier properties, which are all important in products such as bottles for carbonated beverages.
There are two distinct stretch blow molding techniques. In the one-stage process, preforms are injection molded, conditioned to the proper temperature, and blown into containers—all in one continuous process. This technique is most effective in specialty applications, such as wide-mouthed jars, where very high production rates are not a requirement.
In the two-stage process, preforms are injection molded, stored for a short period of time (typically 1 to 4 days), and blown into containers using a reheat-blow (RHB) machine. Because of the relatively high cost of molding and RHB equipment, this is the best technique for producing high volume items such as carbonated beverage bottles.
Extrusion Blow Molding
The extrusion blow molding process begins with the conservative extrusion of a parison or tube, using a die like those used for making plastic pipe.
The extrusion blow molding process begins with the conservative extrusion of a parison or tube, using a die like those used for making plastic pipe. The parison is then extruded downward between the two halves of an open blow mold. When the parison reaches the proper length, the mold closes, catching and holding the neck end open and pinching the bottom end closed. A rod-like blow pin is inserted into the neck end of the hot parison to simultaneously form the threaded opening and to inflate the parison inside the mold cavity. After the bottle cools, the mold opens to eject the bottle. The excess plastic is trimmed from the neck and bottom pinch-off areas.
Blow Molding & Injection Molding
Injection molding and blow molding are the two most popular ways to produce high quality, cost-effective plastic parts and products, however they have differences. The most noticeable difference between parts made by injection molding and parts made by blow molding is that injection molding creates solid parts, while blow molding creates hollow parts.
If you’re producing something that needs one rigid wall, injection molding may be what you’re looking for. Some common examples of parts created with injection molding are bottle caps, hair combs, and housings for computers and televisions. Conversely, if you are looking for a product that is flexible, operational, and can hold a fluid, like a bottle or a cooler then blow molding is what you need.