Closures are a vital component of bottle packaging. They provide a seal to prevent the loss of product.

They can be made of various materials, such as cork, rubber, or plastic foam. They can also feature an o-ring or closure liner to maintain a seal.

Sealing

Closures for bottles generally consist of a sealant that forms a protective barrier between the bottle and the closure. They protect against moisture, oxygen, and external contaminants. They also help preserve products and increase shelf life.

Seals for jars and bottles can be applied manually or automatically. Using a seal requires proper application torque and an extended rest period after the pressure-sensitive liner is installed to activate its adhesion properties.

The manufacturer determines the optimal application torque for closure. This torque is typically in inches-pounds and can be found on the packaging resource guide.

The primary sealing features for bottles include nub seals, plugs, claws, and gasket systems. Some of these features double as torque limiting, stress localization, or application torque limiting devices.

Dispensing

Dispensing is preparing and distributing medication to patients based on a prescription. This process is essential to rational drug use and can have significant health impacts if not done correctly.

Disposable bottle closures allow one to easily dispense liquid products by flipping them open and dumping or squeezing them out. They come in many different styles and are used by companies worldwide.

A common type of closure is the disc top cap. These caps snap onto a bottle and close after dispensing by pressing it down.

They can be an excellent option for personal and pet care products like shampoos, conditioners, shower gel, lotion creams, etc. They also have a slightly wider opening, ideal for thicker liquid products.

Other bottle closures include droppers and pumps, which dispense a balanced product. They are usually glass or plastic and have measurement markings to allow consumers to dispense just the right amount of product.

Tamper-Evident

Tamper-evident, or tamper-proof, closures seal bottles and indicate whether a bottle is open. Food and beverage, pharmaceutical, dietary supplements, medical devices, and other industries are just a few that use them.

Generally speaking, tamper-evident closures use a sealant to create a tight seal around the bottle and seal the container. It is instrumental in preserving product integrity and giving consumers confidence in their purchases.

Recyclable

Recyclable closures help reduce pollution and energy use by reducing the need to produce new plastic products. They also prevent materials from being discarded in landfills and waterways, where they can cause harm to marine life.

In addition, they help keep bottle caps in use and out of landfills. It can prevent them from rotting and decomposing in landfills, which could lead to dangerous chemicals leaking into the environment.

Advancements in resin design and mold technology have enabled a greater degree of lightweight, with improved barrier and sealability properties, in closures designed to replace two-part solutions. This trend will continue as converters, and brand owners look for ways to incorporate more recycled content into their products and designs.