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.