Blow Molding Machine
Blow molding machines are used to make hollow plastic products such as bottles and jars. They also produce automobile components like air ducts and bumpers. They are known for their efficiency and precision in producing blow-molded products.
Plastic resin is fed through the hopper or screw, which heats and melts it. It is then pushed out through the die to form the parison.
Extrusion
Extrusion blow molding machines use a continuous process to produce high volumes of quality hollow plastic products. It uses a series of molds positioned around the periphery of a rotating wheel. Different parts of the wheel correspond to various blow molding processes like parison clamping, cutting, inflating, cooling and ejecting.
The melted plastic pellets enter an extruder screw that has a heating unit that melts the material, thereby creating a tubular preform called a parison. The parison passes through a screen and breaker plate, which removes inconsistencies and contaminants. The molten plastic is then forced through a die to create the desired shape and cross section of the finished product.
As the parison exits the die, it is cooled by air contact or metal contact cooling systems before being quenched to solidify it. This step ensures that the new product is of the highest possible quality and consistency. It also eliminates defects, such as dents and bumps. It also reduces production time and allows the manufacturer to meet demanding customer specifications. The machine also produces a lower cost product that is environmentally friendly and easy to recycle.
Clamping
Blow molding uses low-pressure air to shape a plastic tube called a blow molding machine parison. This process is used to manufacture plastic bottles of all shapes and sizes. Millions of people use these bottles every day to hold soda, water, and cleaning products. The blow molding process can also produce a wide variety of other thermoplastic products.
A good quality clamping device is important for the success of a blow-molding machine. It needs to be able to provide the necessary force to lock the mold, withstand the parison inflation pressure, and cut off tailings and flash. There are two main types of clamping systems: hydraulic and mechanical.
The clamping device 1 of a blow molding machine has a body portion 2, a crank mechanism 9, and connecting rods 92, 93. A drive motor 10 provides a driving force to the crank mechanism 9. The movable platen 6 and the rear platen 5 are connected to the crank arm 91 through the connecting rods 92, 93. The hung parison P is positioned within the cavity of the split mold halves 7, 8. The clamping mode action of the mold-clamping device is shown in FIGS.
Inflating
Blow molding is a popular process that produces hollow plastic products. It is also a relatively cost-efficient manufacturing technique for high volumes of product. This method allows manufacturers to create a variety of products including plastic bottles, shampoo bottles and automotive ducting. The process is also easy to sanitize and lightweight.
During the inflating stage on a blow molding machine, the plastic preform is heated with compressed air and then placed inside of a mold to form the final shape. The plastic workpiece is then cooled and ejected from the mold. The types of blow molding machines vary and include rotating wheels that have different sections that correspond to the stages of parison clamping, inflating, cooling and ejecting.
Injection and injection-blow molding are two common types of blow molding machines. Injection and injection-blow molding machines use the same process to produce hollow plastics, but they differ in how they do it. Injection-blow molding is more time-intensive than extrusion-blow molding. It also requires more maintenance to prevent contamination and carbon buildup. Cleanliness is key for blow molding facilities because contamination can cause expensive production problems. Purging on a regular basis helps to prevent contamination and maintain a high level of productivity.
Cooling
Cooling on a blow molding machine is an important process step that helps to shorten cycle times, improve size stability, reduce shrinkage deformation of small products, and extend the life of the product and mold. It also reduces material stresses and enables the use of thinner wall thicknesses. Wittmann Battenfeld’s Internal Air Cooling Systems (formerly marketed by Farragtech and now part of the company) offer a solution.
During the extrusion blow molding process, plastic resin is melted and forced into a hollow tube shape known as a parison. The parison is then clamped into place in a metal mold, and compressed air is blown into it to form the final product. The inflated product is then ejected from the mold when it has cooled.
Injection blow molding is a similar process but is less common because it takes longer. blow molding machine factory Injection blow machines are used for a variety of applications and can produce bottles, containers, and other hollow plastic products. Injection blow machines are typically more expensive than extrusion and stretch blow molding machines because they use a mandrel instead of the core pins used in the other two processes.
Ejecting
Blow molding machines utilize a series of steps to create hollow plastic products. These include extruding the resin, clamping it in place, and blowing it to shape it into a mold. These machines are used in a variety of industries to manufacture items such as bottles, containers, and packaging. They are also useful for making toys, bellows, blade cases, tool boxes, tea pots, and even plastic sports equipment.
During the injection station a ram usually a reciprocating screw forces the melted thermoplastic resin under pressure into a closed split parison cavity injection mold. The preform, which is shaped as a jar- or bottle neck, is then affixed to a core rod and brought to the blow station. At this final station, the mold closes, a trigger bar opens the core rod air passage and compressed air blows the parison to form the desired plastic shape of the product.
Unlike injection molding, which is a multistage process, blow molding is a single stage. This reduces cycle times and makes it a more efficient method for producing a wide range of plastic products.
