How Are Bottle Closures Measured?

To identify a bottle closure, you need to know its inside diameter in millimeters. This diameter is then identified by its manufacturer-designated number. Watch this video for a demonstration of how to measure bottlenecks and caps. For more information, contact O.Berk Company. You can also refer to the manufacturers’ website. Read on to learn more about measuring bottle closures. You need to consider several different measurements, including concavity, Thread finish, Size, and Pull-up.

Cap concavity

How are bottle closures measured for concavity? Previously, manufacturers relied on a laser to determine the level of concavity. This method wasn’t ideal because not all bad caps were detected. After each batch, the quality assurance team manually checks bad caps with a micrometer. Although this method has proven helpful in finding bad caps, it is still time-consuming and leaves a chance for the bad caps to reach the printing company. In addition, rejected orders must be melted down and reproduced, wasting both time and money.

The most common closures for bottles, such as screw-on and metal crown caps, are made of plastic. Because of the flexibility of most plastic materials, they are susceptible to blow-off. Most carbonated beverages can generate enough internal pressure to blow off plastic caps. To combat this problem, plastic caps usually incorporate an inner skirt that enters the bottle’s mouth to seal the beverage. The inner skirt is sometimes reinforced with an outer strengthening collar.

Thread finish

Bottle closures come in various styles, but one of the most common is the “L” thread profile. This profile has a 30-degree thread contact surface and is common among bottle closures. It is less expensive to produce, lines more easily, and works well with most closures, including those made for PET bottles. Listed below are some examples of the various thread finishes available. When choosing a bottle closure for your beverage container, you should consider these factors.

A thread finish is a way to distinguish between two types of closures. The thread finish on the cap refers to the outside diameter of the bottle opening. The threads are made of a spiral, and the cap must have the same finish to fit properly. When choosing a closure, be sure that it matches the thread finish of the container. For example, a 24/400 closure will not fit a bottle of a different size.

Thread size

The diameter of bottle closures is measured in millimeters. The size of a bottle closure is measured across the thread, starting at the outermost point. Closures are also sized according to their thread finishes or the thread’s height, or the number of turns. The Society of Plastics Industry sets standard heights and turns for threaded closures. Therefore, the diameter and thread size are important considerations when choosing a bottle closure.

For example, a screwed-on closure is made with a thread profile of 30 degrees. The “L” thread profile is much less expensive and easier to the line. In general, this thread profile works well with most bottle closures. The “L” thread profile is also widely used for newer molds, PET bottles, and more. It is ideal for various applications and can be found in many different sizes.


The pull-up bottle closure measurement is a secondary non-destructive test to determine the proper application of closures. Pull-up measures the distance between the bottle and the closure thread in selecting the proper application. Sometimes referred to as an “application angle,” this measurement determines how far the closure has been applied to the bottle. It is essential when using bottle closures manufactured in a factory or by a contract manufacturer.

To use the pull-up bottle closure measurement, start by aligning the zero mark on the gauge with the ‘zero’ mark on the bottle. The zero point is typically found at the half-moon shape in the bottle’s transfer flange. Next, turn the gauge clockwise or counterclockwise by one-eighth of an inch to the closure pull-up indicator mark. Once the dial on the pull-up gauge is positioned with the closure pull-up indicator mark, the bottle is ready for use.


With the vast assortment of plastic bottles, jars, and lab supplies, Qorpak can fulfill various needs. The company offers phenolic, ethylene, and polypropylene bottles and different lids and closures. Qorpak’s range of laboratory packaging solutions includes a range of lids, closures, and trigger sprayers. Moreover, the company provides clear glass and metal bottles with various closures, including screw thread and polypropylene.

The most crucial factor in measuring the size of the cap is the overflow capacity, or the bottle’s volume when it is filled to the brim. Another important factor in determining the size of a bottle closure is the headspace, the space between the cap’s neck opening and its contents. Some volatile chemicals or gases may leak from this space, making it important to determine this space. The Qorpak Cap and Bottle Measurer will help you choose the neck’s diameter.

SICK Profiler 2

The SICK Profiler 2 is a device that accurately measures the concavity of bottle caps. It does this by calculating the horizontal position of the closure based on its image data. For example, in testing the device on a batch of 1000 caps, we could automatically remove caps with a concavity greater than 76 mm. We can also use the machine for several additional applications, including detecting contamination in beverage containers.

The SICK Profiler 2 measures the oxygen content of bottle closures, which is a key factor in the preservation of wine. The closures used in still wines must meet a range of criteria. For example, they must be fault-free and offer optimal conditions for storage. Oxygen-related characteristics of bottle closures are essential for sustainable development. This is one of the reasons why consumers should seek out companies that have adopted sustaina

Christopher Lewis

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