Ejecting a molten liquid plastic material into a preformed mold creates extrusion blow molded plastics. The two halves of the mold are pressed together and air pressure is used to blow in the liquid plastic until it fully fills the preformed cavity conforming to the mold’s shape. When the molding process in completed, the molded plastic component is emptied from the mold and trimmed of any over molded plastic fragments that are not part of the intended finished piece.
The component is allowed to cool until totally solid and the plastic fully congeals and any additional finishing work is then done to the piece. Some molds have multi-injectors and several plastic components can be fabricated at the same time. Multi-molding allows for a more rapid fabrication process.
Advantages of Extrusion Blow Molding for Blow Mold Plastics
The extrusion blow molding fabrication process is appropriate for creating parts that do not have to be highly precise, can have only one thickness, and do not need to have precise exterior finishes. Extrusion blow molding may be a superior and more inexpensive process for you, since injection molding and injection blow molding can be a more costly process due to higher cost of the injector apparatus. The Western Case team can assist you in figuring out which particular molding process suits your product fabrication needs so that you can plan accordingly.
We have fabricated and helped launch successful projects for all of the world’s top automotive companies. We are proud to be a supplier and we seek to provide our utmost in the area of quality assurance, precision engineering, and project management support.
Western Case’s time honored experience extends to the following manufacturing areas:
Automotive components for exteriors
- Paneling and Railing
- Bumper Support
- Mud Guards
- Door Locking Systems
Automotive Molded Systems – Interior Components
- Garnish Pillars
- Storage Systems
Interior Wrapping for Automotive applications
- Console Lids
- Shifter Knobs
- Steering Wheels
Under the Hood plastic components
- Fan Shroud
- Cooling Systems
- Fuel Tank Systems
- Electrical Covers
Decorative Automotive plastic components
- Interior /Exterior Trim
Blow molding uses air pressure to inflate soft plastic into the cavity of a mold. It produces one-piece plastic parts that are hollow with thin walls, like bottles and other containers. These blow mold plastics typically are produced in very large quantities because many are utilized for mass-market consumer beverages.
Blow Molding Technology – Where It Originated
Blow molding technology originated with the glass industry, which competes with the plastics industry in the recyclable and disposable bottle market.
The Steps of Blow Molding Production
Blow molding has two steps.
1. The first step is fabricating a molten plastic tube, known as a parison. This is done either through injection molding or extrusion.
Injection molding uses an injection unit and a clamping unit and can form three-dimensional shapes. Extrusion pushes the material through a two-dimensional opening and through a series of sizes or shapes until it reaches the desired form. It produces linear shapes.
2. The second step in blow molding is inflating the tube until it reaches the desired shape.
Blow molding only is used for thermoplastics.
Materials Used for Blow Mold Plastics
The most commonly used polymer is polyethylene, especially high molecular weight polyethylene (HMWPE) and high density polyethylene (HDPE).
These more expensive materials are more economical than low-density polyethylene, since the stiff container walls can be thinner. Blow moldings also can be made from polyethylene terephthalate, polyvinyl chloride and polypropylene.
Most products from blow molding production are used for disposable containers for liquid consumer goods. Other products include 55-gallon shipping drums for powders and liquids, 2000-gallon storage tanks, automobile gasoline tanks, toys and small boat and sailboard hulls.
Blow molding production is a process that takes plastic and turns it into hollow items using an extruder and a mold. The result of this process has certain benefits that include environmental resistance, gas and vapor barriers, resistances against impact, clarity or color, and the ability to be printed on.
Advantages to Using Blow Mold Plastics
There are many advantages to using blow mold plastics, the first of which is the fact that it helps to lower the overall costs of molds. This is because those much lower pressures are used for production. Another benefit is that blow molding carries with it much lower machinery costs if you look at the costs in terms of each unit weight of materials that end up being processed with the machines.
Another advantage to using blow-molding production is the fact that threads can be molded externally on the bottles, adding to the way the bottle is shaped. Additionally, large open ends can be created if needed by choosing a symmetrical mold that can be evenly split open.
Depending on the geometry of the mold and the size of the parison used, we can determine the outside dimensions of each mold for a customizable fit. You can also control the thickness of the walls and manage the weight very specifically with customized design.
Contact Our Blow Molding Production Company to Get Started with Your Project
Contact Western Case at 877-593-2182 of email us at firstname.lastname@example.org to find out more information about how we help you with blow molding.
Western Case made the move to a new state-of-the-art facility late last year. The addition of six large, single and multiple head blow molders has increased our production capacity by nearly 2.5 times. The WCI management team is setting new sales targets due to this increase in capacity, and as of quarter two 2014 our custom blow molding production is returning very favorable results.
By moving from a 20,000-square-foot facility to a 58,000-square-foot facility, Western Case has positioned itself to be one of the leading blow molding plastic companies in the country. Western Case’s plastic carrying cases are already one the most respected plastic carrying case lines available in the market. Now, we have ability to take on higher volume custom blow molding and custom plastic carrying case projects.