One of the first steps in creating a molded plastic product is to decide on a manufacturing technique. Blow molding and injection molding are two popular processes with unique advantages and drawbacks. It's important to develop a good understanding of both methods before you can determine which one is most suitable for your company's needs. This blog post will discuss the difference between a blow mold and an injection mold, and the most common types of products made using each technique.
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Blow Molding vs. Injection Molding
While blow molding and injection molding both involve filling molds with melted plastic, their processes and the types of objects they can create are very different. Let's take a look at each method.
What is Blow Molding?
Blow molding creates hollow products from thermoplastic materials. Technicians create performs, or parisons, by heating and expanding plastic tubes. The preform is placed between two dies that contain the final product's desired shape. Next, air is supplied into the tube, causing it to gradually expand and conform to the mold's shape.
After the blowing process is complete, the product is cooled and then ejected from the mold. It is then trimmed of any excess material and prepared for secondary processes.
Blow Molding Advantages
Blow molding allows manufacturers to create high quantities of hollow plastic products in a short period of time. Some of the benefits blow molding delivers include:
- Low machinery costs
- Automated production
- High product variety
- Many production methods, such as extrusion blow molding, stretch blow molding, and others
Blow Molding Products
Blow molding has become a very popular manufacturing process. Many industries use it to create containers or other products. Some of the most common applications for blow molding products are:
- Automotive components
- Appliance parts
- Children's toys
- Industrial bulk containers
- Medical supplies
- Marine products
- Lawn and garden items
- Product packaging
- Sporting goods
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What you need to know before selecting a molder for your project
Download our eBook, “10 Must-Ask Questions When Choosing a Plastic Injection Molder.” Inside, we cover key questions like:
- Does the molder guarantee the molds for the life of a project?
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Download Your Free CopyWhat is Injection Molding?
Injection molding is the process of creating solid plastic parts using precision molds and tooling. It involves using a machine to inject molten plastic materials into a custom-developed mold to produce a product. Injection molding is an excellent way to economically mass produce custom, solid plastic products.
Injection Molding Advantages
Injection molding is an excellent method for producing high-precision, highly repeatable plastic parts at a minimal cost per unit. Some key advantages of injection molding include:
- Fast and efficient production
- Low labor expenses
- Exceptional design flexibility
- Compatible with a wide range of materials
Injection Molding Products
In applications where a high degree of design intricacy is required or where high-volume production runs are needed, injection molding provides an effective solution. This versatile process creates a wide variety of products, including:
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Suggested reading:
- Agricultural components
- Automotive components
- Electronic housings
- Toys
- Plastic bottles
- Healthcare products
- Construction products
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How Can Automatic Shrink Wrapping Machine Manufacturers Improve Your Packaging Efficiency?Blow molding and injection molding are two popular methods for creating plastic parts. At The Rodon Group, we offer custom plastic injection molding solutions developed with quality and efficiency in mind. As an ISO 9001:2015-certified manufacturer, we specialize in high-precision plastic parts that adhere to tight tolerances. If you think injection molding might be a good solution for your next project, get in touch with our team or request a quote today.
Blow molding (spelled “blow moulding” in most of the English-speaking world outside of the United States) is an extremely affordable, sustainable, and versatile process for manufacturing plastic products, but, as is the case with any manufacturing method, it has its benefits and drawbacks. Blow molding can refer to a few different methods, including extrusion blow molding, injection blow molding, and injection stretch blow molding.
While the types of blow molding vary, the benefits of this revolutionary technology are universal.
What are the Advantages of Blow Molding Plastic?
The three major advantages of blow molding are:
- Low Cost
- Speed
- Versatility
1. Blow Molding is Relatively Inexpensive
Cost is a big factor in any manufacturing, especially a large-scale, industrial plastic manufacturing job. Blow molding is typically quite inexpensive compared to other fabrication methods, making it completely customizable and scalable to your or your client’s needs. Furthermore, it simplifies applying external threads, improving overall product quality and consistency.
2. Blow Molding is Fast
Blow molding is also a relatively fast manufacturing solution. Professional grade injection or extrusion blow molding machinery is capable of producing huge quantities of finished plastic products and can run for a virtually indefinite amount of time. Whether you need a short run of plastic bottles or a large order of custom plastic cases, injection blow molding might be the solution for you.
3. Blow Molding is Versatile
The versatility of blow molding is a big advantage and a reason it revolutionized a number of industries. The diverse number of customizable bottles, containers, and other products makes blow molding especially attractive to food suppliers, medical and pharmaceutical companies, and more.
Blow molding also provides a wide range of resins and colors to choose from high-density and low-density polyethylene (HDPE and LDPE) to polypropylene (PP) to engineering resins such as K-Resin, PETG, and Polycarbonate.
Disadvantages of Blow Molding Plastic
The two major disadvantages of blow molding are:
- Plastic Waste
- Design Limitations
1. Blow Molding Plastic Contributes to Plastic Waste
One disadvantage of blow molding plastic is the fact that you’re working with plastic, a petroleum product. That said, many plastic polymers used in blow molding are recyclable, and our industry is hard at work finding more durable, versatile, and sustainable materials.
2. Design Limitation of Blow Molding
Another disadvantage is the limitations in the design of blow molded products; hollowed out custom plastic bottles, rectangular plastic cases, and other similarly shaped objects are usually the best fit for this process.
The Advantages of Blow Molding Outweigh the Disadvantages!
As you can see, the benefits of blow molding are more numerous and significant than the disadvantages, as long as the product you have in mind is a good fit for one of our processes. Blow molding produces durable, inexpensive products in large quantities, and those products are often recyclable when they reach the end of their life cycle. When you speak to a Blow Molded Products customer service specialist, we’ll have you walk us through your needs and vision for your product. If we think another approach would be best, we’ll tell you and can help guide your project in the right direction. Contact our expert team today at (951) 360-6055!
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