Capping FAQ · Food & beverage packaging
Was ist eine Laschenverschließmaschine?
A common question from food and sauce brands. Npack designs and manufactures several types of lug capping machines for the food industry — but to make sense of the equipment, it helps to start with the cap itself.
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What is a lug cap?
If you’ve ever twisted open a jar of tomato sauce, pickles, or another sauce jar product, you’ve probably encountered a lug cap — though you might not have known its name. Unlike common continuous-thread caps (think the classic screw-top jars from brands like Ball or Mason), lug caps use a specialized design.
Instead of a single continuous spiral thread, lug caps feature several angled metal tabs — or “lugs” — inside the cap’s skirt. When you place the cap on the jar and twist, these lugs catch and lock onto matching threads on the jar itself. That means you only need to turn the cap about half a rotation, or even less, to get a secure seal or to open it back up.
Angled internal lugs catch matching threads on the jar — a partial twist locks or releases the seal, instead of a full spiral rotation.
This design not only makes lug caps quick and easy to use, but also helps achieve a tight seal with minimal effort — perfect for both food preservation and high-speed production lines. So next time you open a jar with a quick twist, you can thank the clever engineering behind the humble lug cap. For more detail, see this reference on lug caps.
Was ist eine Laschenverschließmaschine?
A lug capping machine is a semi-automatic or automatic capping machine that places and twists on the lug cap onto a glass jar or bottle. It’s one type of capping machine, popular in food packaging. Machines can be semi-automatic or automatic, single-head or multi-head — the right model depends on your packaging output requirements.
Main types of lug capping machines
When choosing the right machine for sealing lug caps, it helps to understand the primary types found in the industry. Each suits different production needs and bottle types.
Vacuum capping machines
Ideal for products that need an airtight seal — sauces, pickles, or jams. These machines remove air from the bottle before applying the cap, significantly extending shelf life.
Spindle capping machines
Use sets of spinning wheels (spindles) to tighten caps as bottles move along a conveyor. Popular for their speed and adaptability across bottle sizes.
Chuck capping machines
Equipped with a gripping chuck that securely holds and rotates the cap onto the bottle for a tight, precise application. Especially suited to heavier or uniquely shaped caps.
Die Auswahl des richtigen Typs hängt von Ihren Produktanforderungen, dem gewünschten Automatisierungsgrad und den Besonderheiten Ihrer Produktionslinie ab.
Determining the right number of capping heads
If you’re matching your production target to the right equipment, a simple guideline helps: each capping head on a rotary chuck capping machine can generally handle about 2,000 bottles per hour.
Keep in mind that larger caps or tricky bottle shapes can slightly reduce throughput. For smaller production runs or simpler operations, a single-head system typically handles up to about 30 bottles per minute. As speed requirements grow, upgrading to more capping heads keeps the line efficient and reliable.
Schlussfolgerung
Lug capping machines are popular packaging equipment for sealing glass jars and bottles, particularly for food and beverage products. They’re commonly found on containers holding hot-filled goods like pasta sauces, salsas, and a variety of spreads. If you’re not sure how to choose a lug capping machine, feel free to contact us for help.
Not sure which lug capper fits your line?
Tell us your jar size, cap type, and target output — we’ll help you match the right vacuum, spindle, or chuck capping setup.