Snap-on closure

Different consumer needs, whether for infant, child, or adult, varies the concentrations of the active ingredients in a nasal drug formulation. Fig. 4 shows a typical nasal spray system fitted with a snap-on closure. The dispensing system can be adapted to the anatomy of the patient. The actuators for pediatric application are slimmer in their geometry and the dosage volume is reduced (Fig. 5). 

Fig. 4 100 gL nasal spray system with snap-on closure. 

A snap-fit, or snap-on, closure is made of a resilient material and is designed to deform as it passes over a protruding feature on the container (Fig. 11.7). Removal of the closure requires deformation again to snap the closure back over the protruding feature, which is typically a retaining ring. When the closure is in place, some resilient part of the closure system that is in contact with the container remains deformed, and provides a seal as it attempts to return to its original dimen-... 

A snap-on closure where a raised ring is forced over a bead or lip. An example is the SteriUab snap cap eye drop bottle (Sect. 24.4.2). 

A typical container closure system is a plastic (usually HDPE) bottle with a screw-on or snap-off closure and a flexible packaging system, such as a pouch or a blister package. A typical closure consists of a cap — often with a liner — frequently with an inner seal. If used, fillers, desiccants, and other absorbent materials are considered primary packaging components. 

Ground joint stoppers and snap-on plastic caps are commonplace, but many laboratory containers do not come with built in stoppers or seals. In the absence of a formal closure, or closures such as corks or rubber stoppers, there is the covering film, PARAFILM M . ... 

These were widely used in the UK for pharmaceutical tablets, powders, etc., but are now less popular in Europe and the USA due to cost compared with glass and plastic. Closures are plug (polythene), snap-on over bead (polythene), or metal screw cap... 

A sifter-top container (or a powder castor) is ajar that has a sifter top (this is a closure with small diameter openings to apply a powder onto the skin) and a lid. The sifter-top container is made of plastic, usually polypropylene. The sifter-top container can be filled via the top, after taking the sifter-top applicator off or via a snap-on base. Sifter-top containers are available in the volumes of 50 and 100 mL. 

To improve appearance and differentiate a product from the competition a deep-drawn valiant, the deep snap reseal, is available. The deep-drawn closure allows space for more graphics on the skirt of the cap, which can be seen from the store shelf. In addition, the deeper skirt allows easier removal and application of the closure. 

The metal tube is a multiple-use container sealed with a moisture-proof closure. The tablets are stacked on top of one another. Consequently, a minimum of air surrounds them. The tubes are seamless, extruded aluminum packages. They are closed by tightly fitting plastic snap caps that contain a desiccant chamber. Tubes of plastic materials, such as polyvinyl chloride or polypropene, have been tested with effervescent tablets. Acceptable stability was obtained with some of these products. Plastic tubes are used more often due to their lower cost and lower noise level during the packaging operation. 

Sew-on fasteners provide simple, easy-to-use fabric closures for clothing, accessories, and home decorating. These sew-on fabric and clothing fasteners can be used instead of buttons, snaps, or zippers and are washable by machine or dry cleaning. Simply hand- or machine-stitch aroimd the edges of the tape and backstitch to secure. 

Figure 11-94. This nonbackoff cap, or NBO, from Sunbeam goes on like a screw cap and seals like a snap cap to provide a liquid-tight closure. These caps are injection molded from Marlex polypropylene supplied by the Phillips Chemical Co. Although conventional screw caps are easy to use, they can work loose or back off during shipping and handling. Although snap caps sometimes are difficult to operate, they provide a positive seal—the cap is either open or closed.

Dampers that snap closed have often incurred sufficient vacuum on the downstream side to coUapse the duct (see Ref. 1). Smoke and other control dampers that close normally and restrict the total air flow of a rotating fan can cause pressure (or vacuum) within the duct equal to fan shutoff pressure. A fan might require a full minute after the motor is deenergized before coasting to a safe speed (pressure). Provide adequate duct construction, relief doors, or delayed damper closure (as approved by the authority having jurisdiction). 

Zippers are nothing short of miraculous when they function properly. When they jam or break in public, however, our love affair generally cools. But don t default to snaps. Velcro, or hook-and-eye closures simply because you re intimidated by zippers. It s not rocket science. It just takes a little practice. For your first-time zipper projects, try to choose a zipper with a slider on the smallish side. They re easier to deal with because they re less bulky. Also, do your best to match the length of the zipper with the length of the opening in your project. 

Consider a snap/flt-type latch for a closure on a door or box or similar device. Consider the configuration shown in Figure 7.3 and model it as a cantilever beam where the deflection 5 must be at least equal to the height h if the latch is to work ... 

---