How much does a blow molding machine 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.
Can PET be blow molded?
PET is a popular choice for drinks bottles because it is lightweight, safe and fully recyclable. The PET bottle blow moulding process works by reheating a pre-moulded PET preform which is then automatically positioned into a mould.
What is PET stretch blow moulding machine?
Pet Stretch Blow Molding Process Stretch Blow Molding is a process used for producing bottles commonly used for water, juice and other related items.
What is PET blow machine?
Two Stage Blow Molding Machine In the early developments, performs were made by continuously extruding a PET tube. To make these prefroms, a perform manufacturing machine that took a continuously extruded PET tube, heated and closed one end, and then heated the other and formed a thread finish by blow moulding.
How do you manufacture PET bottles?
In the making of PET plastics, terephthalic acid is combined with Methanol to produce Dimethyl Terephthalate and water. This product is then combined with Ethylene Glycol at a temperature of 305 degrees Fahrenheit to create another substance, known as Bis(2-hydroxethyl) terephthalate and methanol.
How do you blow a PET preform?
First, process the plastic into a preform (injection or extrusion) and place the high-temperature preform in a blow mould. Inject compressed air into the preform to inflate it until it is close to the cavity wall, and maintain the blowing pressure until the bottle cools.
How does a blow molding machine work?
The process involves heating a plastic tube (known as a preform or parison) to its melting point and then putting that into the cavity of a mold. They then use compressed air to inflate the molten plastic like a balloon so that it takes the shape of the mold but is hollow inside.
What is PET material?
PET (also abbreviated PETE) is short for polyethylene terephthalate, the chemical name for polyester. PET is a clear, strong, and lightweight plastic that is widely used for packaging foods and beverages, especially convenience-sized soft drinks, juices and water.
How are preforms blown?
In the ISBM process, the preforms are heated (typically using infrared heaters) above their glass transition temperature, then blown using high-pressure air into bottles using metal blow molds. The preform is always stretched with a core rod as part of the process.
What are the disadvantages of blow moulding?
Disadvantages of blow moulding
- Limited to hollow parts.
- Low strength.
- To increase barrier properties, multilayer parisons of different materials are used (thus not recyclable)
- Trimming is necessary to make wide neck jars spin.
- Limited to thermoplastics (rotational moulding can be used with thermosets)
Is blow moulding cheaper than injection moulding?
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.