Blow molding is the manufacturing process by which hollow plastic parts like bottles and containers are formed. At Apex, we use a process called continuous extrusion blow molding to turn raw plastic into high-quality finished products for our customers.

Whether a bottle is manufactured to hold shampoo, barbecue sauce, alcohol, or a myriad of other contents, most of the time it requires a label or imprint before it reaches the marketplace. But unless that bottle undergoes Surface Treatment, the all-important identifying of the bottle’s contents can’t occur.

This article titled "How to Fix Pinch-off Failures" by Lew Ferguson from Parisons was reprinted with persmission by the author.

Article on "How to Fix Pinch-off Failures"

Before we start working on a new project for a customer, we always want to get project specifications first. We have over 40 years of experience in all kinds of blow-molded bottles and containers. It is important to work with an experienced molder that you are comfortable with. We have dozens of stock bottles and containers, but if you need something more unique, we can work with you on a custom tool.

The neck of a plastic bottle holds the closure onto the container with protruding threads. When determining the compatibility of continuous thread (CT) closures, it is important that both the bottle neck and closure have the same finish.

The finish of a CT bottle is composed of two numbers separated by a hyphen, such as 28-400. The first number is the outside thread diameter of the container in millimeters. The second number is the thread style or finish. That number determines the number of turns required to seat the closure on the container.

The backbone of any good Quality Assurance program is a solid Quality Management System (QMS). By adhering to the requirements of QMS, we can be assured that the appropriate work is being completed on each product. Apex Plastics is an ISO 9001:2008 registered company.

With extrusion blow molding, a good mold can get you a long way toward where you want to be. To get the rest of the way, the process – the type of plastic, processing parameters, head tooling selection, to name several – has to be carefully considered and controlled.

The Life of A Blow-Molded Product Mold

If you were preparing to drive cross country, chances are you’d schedule an inspection of your car well before you and your GPS (or maps) hit the road. The same rule of thumb applies to manufacturing a molded product.

Well before your manufacturer of choice schedules your “trip” (production run), they should conduct a thorough inspection of your “vehicle” (mold). The last thing you want is to have to explain to customers, salespeople, or channel partners that you encountered an unexpected breakdown halfway through your journey.

Does Your Manufacturer Follow Good Manufacturing Practices?

Apex Plastics is an FDA registered, ISO 9001:2008 plastics blow-molding manufacturer. Companies involved in the manufacture, process or packaging of medical devices, drugs for human or animals, and food intended for commercial distribution in the United States are required to register annually with the FDA. This includes contract manufacturing facilities that manufacture any of these goods to another establishment's specifications.

Setting Up for a New Part

The manufacture of any new part starts with the mold, but even once we have it there is still plenty of work to do. Creating parts that meet specifications for wall thicknesses, consistency, and weight requires precision, experience, and trial and error. Here's a quick look at some of the steps we take when setting up to make a new product.

At Apex Plastics, our employees are at the heart of everything that we make. When consistency and quality assurance are as important as they are to us, it is essential to have a workforce that is happy, healthy, passionate, and informed.

The job of training is neApex trainingver done, and we are always improving! Every Apex employee regularly gets job-specific training on: