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Tag Archives: blow molding materials

What Materials are Used in Blow Molding Projects?

The extrusion method of blow molding plastic creates a product with a hollow inside. There are common blow molding materials used such as LDPE, HDPE and PP.

The Most Preferred Blow Molding Technique

If you want the full optical effect from pigments, the extrusion molding method is the preferred option. This method ensures that the pigments are aligned and even.

Co-extrusion is a potent method obtaining high coverage and favorable effects. Pearl luster and other similar effects happen when the inner layer is covered.

What to Consider with the Materials in Production

As is the case with most industrial production, it’s imperative that serious consideration be given to the materials used. The cost, processing, and resin properties are also important items to consider.

There may seem like an endless number of plastic materials available, but a great many of them won’t be the most suitable or appropriate for your product. Knowledge and expertise with blow molding materials is critical to your success.

The Easiest Materials to Use

There are a lot of low cost materials that are also some of the easiest materials to use. Polyethylene (PE) and polypropylene (PP) are very popular resins used for molding. These materials are not only inexpensive but they are chemical resistant. When working with plastics it is important to be cognizant of temperature performance. PP and PE each perform better in different temperatures; PP will perform better in higher temperatures as compared to PE.

Designing the Blow Molding Project

Be certain to use accurate design information for you project. There are a lot of resins that can be used in blow molding, but different resins require different processes to assure success. Many are required to be dry prior to processing but the criterion does differ. Get specific directions from engineering personnel prior to proceeding.

How Extrusion Blow Molding Production Works and Materials Used to Create Products

The process of extrusion blow molding is most commonly used in the manufacturing of hollow vessels that can be of nearly any size from small, squeeze bottles such as food coloring comes in, to large septic or water retention tanks.

Materials Used in Blow Molding Manufacturing

There are various materials used for blow molding, but they are limited to thermoplastics.

Polyethylene is the most commonly used of the entire blow molding materials, more specifically HDPE and HMWPE (High Molecular Weight Polyethylene). When compared to the properties seen in low density PE, it is more cost effective to use these higher quality materials.

While the materials may be more costly, the walls of the container can be thinner while still producing a quality end product. Other materials used in blow molding production include PP (polypropylene), PVC (polyvinylchloride), and Polyethylene terephthalate.

High Density Polyethylene

HDPE stands for High Density Polyethylene and its inherent properties make it suitable for a wide variety of applications. It has a high tensile strength, high rigidity, excellent chemical and solvent resistance, and it conforms to the FDA standards for direct contact with food. Each year, over eight million tons of HDPE is used in the manufacturing of such blow molded containers as detergent bottles, milk jugs, trash containers, etc.

That accounts for almost 1/3 of the total worldwide production of HDPE annually. While containers used for consumer goods make up a large portion of products made using blow molding, it is used for many other products as well. Toys, large storage tanks, 55 gallon drums for shipping liquids or powders, and gas tanks are just a few of the other products made with HDPE.

What Products Does Blow Molding Production Create?

Blow molding production can be used to produce high quality, functional, and lightweight containers that are well suited to many uses. While the materials may vary, depending on the product being manufactured, the durability and cost effectiveness of blow molding remains consistent from beginning to end.

Contact Western Case at 877-593-2182 of email us at info@westerncase.com to get a quote for your custom blow molding project.

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