Approximately 40% of the HDPE produced goes into the blow molding market, making it the workhorse process of the HDPE industry. Blow molding is the forming of a hollow object by inflating or blowing a thermoplastic molten tube called a “parison” in the shape of a mold cavity.
Can HDPE be molded?
High-Density Polyethylene can be molded into a variety of different shapes and sizes . With its linear structure and optimal strength, HDPE can withstand environmental stresses such as high-temperature treatment and physical impact.
What plastics can be blow Moulded?
Low density Polyethylene (LDPE), High Density Polyethylene (HDPE), Polypropylene (PP), Polycarbonate (PC) , Polystyrene (PS), Co-polyester, Polyethylene Terephthalate (PET), Polyvinyl Chloride (PVC), Nylon, Acrylonitrile Butadiene Styrene (ABS) are the main resins utilized with blow molding.
What is HDPE blow?
Extrusion blow molding is the largest process user of high-density polyethylene (HDPE). ... Blow molding is the forming of a hollow object by inflating or blowing a thermoplastic molten tube called a “parison” in the shape of a mold cavity.
Which plastics are most commonly used for blow molding?
- Acrylonitrile Butadiene Styrene (ABS) ABS is well-suited for housings, containers, and other household goods. ...
- High-Density Polyethylene (HDPE) ...
- Low-Density Polyethylene (LDPE) ...
- Polypropylene (PP) ...
- Polystyrene (PS) ...
- Polyurethane (PU) ...
- Santoprene. ...
- Kostrate.
Is blow molding cheap?
The costs in blow molding are lower as compared to injection molding. Machinery costs are typically lower as well. One-piece construction so that there’s no need to connect part halves, which can achieve shapes that injection molding cannot produce.
Why are blow molds so expensive?
When something is rare and there is a demand for it, it’s hard to come by and often very expensive. With the rarity of well-maintained blow molds also comes the fact that some of the original companies that made these products are out of business. This makes them even more collectible.
What is HDPE?
- Shampoo Bottles.
- Toys.
- Chemical Containers.
- Pipe Systems.
- Milk Jugs.
- Recycling Bins.
- Grocery Bags.
- Cereal Box Liners.
How do you blow plastic mold?
The process is divided into three steps: injection, blowing and ejection . The injection blow molding machine is based on an extruder barrel and screw assembly which melts the polymer. The molten polymer is fed into a hot runner manifold where it is injected through nozzles into a heated cavity and core pin.
What is the minimum air pressure required in the blow molding process?
Explanation: In the blow molding process, there is some amount of pressure that has to be given to the air for blowing the bottles. The amount of pressure to be given depends on the material. The minimum pressure that can be given in this process is 400 kPa .
Can ABS plastic be blow molded?
ABS is a relatively hard plastic, used to injection mold football helmets. Blow molding grade ABS is typically opaque and colored for use in electronics housings and small appliances. ABS molds well after drying.
How many types of blow molding are there?
In general, there are three main types of blow molding: extrusion blow molding, injection blow molding, and injection stretch blow molding. The blow molding process begins with melting down the plastic and forming it into a parison or, in the case of injection and injection stretch blow molding (ISB), a preform.
What materials are used in blow molding?
- Polypropylene (PP)
- Polyethylene (HDPE, MDPE, LDPE)
- Nylon (PA)
How do I know if I have blow molding?
Examples of parts and products that are created using blow molding include water bottles, shampoo and other small bottles , automotive parts, stadium seating and chairs, watering cans, coolers, or any other type of hollow parts.
How much does a blow mold cost?
A single cavity, extrusion blow mold suitable to produce up to 100M units per year may cost as little as $3,000 . An eight cavity, extrusion blow mold with automatic detabbing equipment may cost as much as $25,000 but may generate sufficient cost savings to return the investment within a short period.
Is blow molding cheaper than injection molding?
The precision of an injection mold generally makes it more expensive than a blow mold . Blow molds have more design freedom between mold halves since each mold half forms it’s own wall shape. With blow molding, the mold is only 50% of the battle.
