In their classic shape, doors have remained almost unchanged for centuries. Today’s solutions significantly improve functional properties while adapting their appearance to current trends. The market offers a wide range of options to meet all, often very strict, requirements as well as individual user needs and preferences.
Thermal insulation and tightness are among the most important criteria when choosing doors. One of the biggest challenges for manufacturers during door design is sealing the lower part of the sash and the threshold area. The situation becomes even more complicated when creating so-called barrier-free doors. In such cases, the sash remains a few millimeters above the floor, which leads to gaps and insufficient sealing.
At the same time, barrier-free doors are an attractive solution for many customers – comfortable and safe. They are ideal where comfort is essential, such as in our homes, schools, kindergartens, hospitals, or care facilities, especially for people with mobility difficulties.
The market now offers solutions that allow for effective door sealing even in such cases.
Automatic drop-down threshold – principle of operation
One of the helpful solutions is the automatic drop-down threshold. These simple sealing devices are designed to fill the gap between the bottom edge of the door leaf and the floor. Their use significantly reduces noise, prevents drafts and light penetration, and helps avoid heat loss.
The insulating properties and tightness of drop-down thresholds are ensured by a movable seal that operates automatically when opening and closing the door leaf. A special button activates and releases springs that move the silicone seal, pressing it against the floor. This allows the door to be sealed when closed. The seal rises as soon as the door is opened. This solution works perfectly where a conventional threshold cannot be used. It is particularly recommended for interior doors.
Drop-down seal – advantages of the solution
Progi opadające powinny mieć cechy zapewniające długi czas niezawodnej pracy oraz pozytywny wpływ na ergonomię produkcji drzwi. Progi serii A’Line, proponowane przez Alumaster Polska, spełniają ten warunek – ich wytrzymałość bezawaryjnej pracy to 1 000 000 cykli. Posiadają zakres cięcia do 20 cm (w odróżnieniu od większości dostępnych na rynku mających zakres cięcia do 10 cm), dzięki temu pozwalają producentowi drzwi na lepszą optymalizację magazynową – wydłużony zakres cięcia przekłada się na lepsze zarządzanie stanami magazynowymi.
Aline drop-down thresholds also feature a brass activation button and are equipped with a mechanism with two springs, ensuring smooth seal operation. They are available in multiple shapes and sizes, allowing use in virtually any door, regardless of material or manufacturing technology.
This solution is appreciated by many customers across Europe and worldwide. A great example is Belgium, where drop-down thresholds are widely known and used. In Poland, an increasing number of manufacturers (including interior door producers) are deciding to implement this solution. To provide customers with products offering the best functional properties while meeting individual needs, manufacturers are constantly seeking new solutions.
Drop-down thresholds are perfect where traditional threshold solutions are insufficient – they ensure comfortable movement in homes, schools, and kindergartens. Used in care facilities and hospitals, they make movement easier for elderly people and those with limited mobility. They are also an ideal solution for offices and hotels.
Thanks to their simple design and easy installation, they are an extremely attractive option. They can be used in doors made of PVC, aluminum, wood, and steel.
It’s worth remembering that drop-down thresholds perfectly meet acoustic sealing, smoke-tightness, and wind protection requirements, prevent dust from entering rooms, and make movement easier for people with mobility limitations, as they do not create an architectural barrier.
Drop-down thresholds – learn more
Detailed specifications of drop-down thresholds from our offer are described in the catalog.
We also encourage you to explore our full range in this area via our new B2B platform.
