Advantages of a Blow Molding Machine
Blow molding is a popular manufacturing process that helps companies produce plastic bottles and other hollow-bodied workpieces. Its advantages include high production capacity and low operating costs.
The first step in blow molding is extrusion, which involves melting and shaping the plastic to form a preform or parison. Then, compressed air is blown into it.
Extrusion
A good plastic extrusion machine can produce a wide range of products. These machines are also known for their durability and precision. They can also be used with a blow molding machine variety of thermoplastics. In addition to these benefits, they can also help reduce production costs and mitigate defects in finished products.
The extrusion process begins with a raw material such as plastic pellets that are fed through a hopper into a rotating screw that is heated and turned into a homogeneous mass. The molten mass is then passed between two separated mold halves. After the mass is clamped by the molds it is inflated with compressed air and conforms to the mold walls.
The extrusion process can be continuous or intermittent. Continuous extrusion can produce larger-volume containers than injection molding. However, it can take longer to cool and deflate the parison. In addition, the temperature of the extruded product may be too high to maintain its shape. In this case, a vacuum sizing system may be necessary to prevent warping. In addition, a cooling bath may be used to uniformly cool the product and ensure its consistency.
Clamping
In the blow molding process, a parison of plastic is extruded into a tube shape and then clamped by the machine. This clamping force is transmitted to the mold and causes it to close around the parison, taking its form. The process produces plastic bottles of various sizes and shapes that are used by millions of people each day for soda, water, cleaning products, food, and more.
The mold-clamping device of the present invention includes a body portion and tie bars that are forwardly and backwardly movable while supported in a horizontal posture by the body portion. The tie bars have front and rear platens that are disposed on their front end and rear end portions, respectively, as well as a movable platen which is disposed on the tie bar in such a way to face the front platen. Split mold halves are arranged on the front and movable platens.
The device also includes a fixed position adjusting mechanism and an expanding blow molding machine factory and contracting length adjusting mechanism. This enables the clamping force to be uniformly applied to the abutment surfaces of the split mold halves without transmitting clamp forces through the frame.
Inflating
Blow molding is a process used to create hollow plastic products. It involves heating the plastic resin to a high temperature, shaping it with air pressure, and then inflating it to give it its final shape. Blow molded plastics are used in a variety of industries, including cosmetics and pharmaceuticals. They are also common in household appliances, such as spray water bottles and storage tanks for shampoos and cleaning materials.
The first step in the blow molding process is sealing or clamping the parison, which is a tube of heated plastic that will take on the final form of the product. After the preform is sealed, compressed air is blown into it to inflate it. As the air is inflated, it conforms to the mold, and when the product is cooled, the mold opens up and the plastic is ejected. The cooling process typically takes a few minutes, and the ejected plastic is sent to another stage of production for finishing. The product is then inspected for quality and compliance with industry standards and regulations.
Cooling
Cooling in blow molding involves the use of a cooling system to ensure that the plastic is not overheated during the extrusion and molding process. This helps reduce flash, stabilizes the pressure of the extruder, and improves the quality of the molded plastic. Cooling systems can be designed with milled channels or drilled holes. They can also include bubblers to connect the cooling channels to form a fountain-like flow of coolant that spreads across the entire mold surface.
Blow molders need to be able to quickly cool products in order to shorten blow molding cycles and prevent shrinkage deformation of small product sizes. Wittmann Battenfeld’s Internal Air Cooling Systems (IACS) are a great way to achieve this. They replace regular blown air with chilled compressed air, which lowers molding stress and speeds cycle times. This system can be used with almost any blow molding machine, and it is available in various configurations to fit your specific application. The system is easy to install and requires minimal maintenance. It also consumes less energy and is CFC-free and ozone friendly.
Ejection
Blow molding is a process used to produce plastic containers, bottles and other hollow plastic products. The molten plastic is blown with air pressure to take on the shape of the mold. The product is then cooled and hardened into the desired shape. This method of production has roots in glass blowing and is still widely used today.
There are three main factors to consider when choosing a machine for blow molding. First, the extruder capacity is important in terms of how much plastic it can melt and extrude per hour. The second factor is the injection station clamp tonnage capacity. Finally, the mandrel capacity is also important, as it determines the interior circumference of the parison.
Injection blow molding utilizes a single tool, making it more restrictive than other types of blow molding. It is also subject to high temperature gradients, molecule orientation, and high stretch rates. The process requires a large amount of energy, which in turn consumes oil. As a result, it is not environmentally sustainable. This is a concern because the plastics produced by this process do not biodegrade.
