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Production of Steel-Windows & Doors

ייצור חלונות בלגים מברזל בתובל מינימל

The History of Steel-Windows production

Steel Windows & Doors are produced in an industrial way for more than 150 years all around the world. The first technological leap was made by Sir Henry Bessemer in England. In 1856 he developed the “Hot-Rolling” technique. Hot-Rolling is an industrial process to shape steel profiles. The principles of this technique are being used today in order to offer Steel-Windows producers a variety of Slim Steel-Profiles, with various different shapes.

A second technological leap was made during the 1950’s, when processes of coating Steel with Zinc were developed. The Zinc coating, whether by dipping the steel-element in melted Zinc (“Hot-Dip”), or by Sprying the element with melted Zinc (“Spray-Flame”), protects the steel-element from corrosion in an effective way. The relatively thick Zinc layer serves as a physical barrier between the steel and the oxygen in the air. In addition, the Zinc protects the steel in a “chemical way” called – “Cathodic-Protection”.

A third technological development, is a technique that enables the production of Slim Steel Profiles with Thermal-Barrier. In order to maintain the strength of the steel-profile, the Thermal-Barrier is made of a strong, non-conductive thermosetting polymer. This technological development had opened the way for Steel-Windows & Doors to enter the segment of “Thermally-Efficient” solution, and to comply with the most stringent thermal-isolation standards.

Steel-Windows & Doors Production: From Profiles cutting to Quality Control

The production of Steel-Windows and Doors is unique in various manners. Steel-Windows & Doors are always custom-made, and hand-made. This short article will review the different processes involved in steel-windows craftsmanship which make these products so special.

All Steel profiles, Thermally-Broken, or Hot-Rolled are produced in 5.8 meters length, which fit a 20 feet container. They are cut in the factory, according to the production plan, using a manual or automatic saw. Then they are distributed to the welding tables.

Prior to the welding process, the profiles are organized and fixed to the table with special clamps. Then they are welded by highly skilled professional welders. The welding technique is chosen according to the specific material of the profile: MIG welding for Steel or Thermally-Broken Steel Profiles, and TIG welding for Stainless-Steel or Bronze Profiles. 

חבילות פרופילים בלגים מברזל. סימון הצבע הקצה הפרופיל מקל על זיהוי הפרופיל - למשקוף, לכנף או לאלמנט קבוע
Hot-Rolled Steel Profiles with Different Shapes: for Fixed, Casement etc.
עמדת חיתוך הפרופילים
Cutting Steel Profiles stand
לאחר שהפרופילים מסודרים על שולחן הריתוך, ומקובעים היטב ניתן לרתך אותם
Welding tables: the profiles are first fixed to the table. MIG Welding.

The quality of the welds is critical for the strength of the element and it’s fine look. Hence this artistic work requires special attention and highly skilled craftsmen. In order to keep the most elegant and clean look, each and every welding point is grinded with dedicated tools. 

השחזת ריתוך בפרופיל מיוחד עם נתק תרמי, עבודה מדוייקת נקייה מסימני ריתוך
Grinding of Thermally-Broken Welded Profiles

Zinc-Metalizing using Spray-Flame technique

Once the production of the steel element is completed, it continues to “Rust-Protection” processes. Sand-Blasting is a process of “cleaning” the profiles. The blasted steel grains remove the existing rust, and prepare the surface of the profiles for the next step: Zinc-Metalizing. 

Zinc Metalizing is done using a special Gun which melts Zinc wire/s and shoots the melted Zinc towards the surface of the profile. The process is also called Spray-Flame, and can be done using an actual Flame (generated by gas), or electric arch. This method of coating the surface of the profiles with melted zinc is considered to be the optimal alternative to “Hot-Dip” galvanizing. It is very efficient and provide good flexibility, especially when treating large elements with complicated shapes.

"ניקוי-חול" הוא למעשה התזת גרגירי פלדה שמנקים את פני השטח של הפרופילים ומכינים אותם לקראת שלב התזת האבץ החם
Sand Blasting - cleaning the profiles and preparing them for Zinc-Metalizing
חוט אבץ מוזן אל תוך אקדח עם להבה שמתיז אותו כשהוא לוהט על פני הפרופיל הבלגי. הכיסוי מיטבי ומצפה את כל פני השטח של הפרופיל, כולל הפינות
Zinc-Metalizing: coating the surface of the profiles with meletd zinc. The flame melts the Zinc wire and shoots it towards the steel-element

Multi-Layer Wet-Spray Painting 

Once the Steel-Element is fully covered with Zinc, and tested for its thickness and coverage, it is moved to the next stage: Paint & Polish.

All our Steel-Windows & Doors are treated as “Pieces of jewelry”. Between the Primer-paint and Top-coat, we polish the Joints, Hinges, cornets, and surface of the profiles in order to achieve a flawless and most elegant look.

We use top-quality German paints. The primer is rich in solids and provides additional protection again rust. The Top-Paint is the highest quality acrylic paint- resistant to UV and abrasion. 

Wet-Spray Painting is the optimal technique for the painting of Steel-Windows & Doors, especially if the portfolio include also Thermally-Broken profiles.    

The color selection is very wide, based on RAL Chart, and include also special and unique Natural Finishes.

חלונות ברזל מיוצרים באופן ידני ועוברים תהליכי ריתוך ופיניש ידניים. המוצר הסופי "נקי" מאד ואלגנטי
"Pieces of Jewlery": Each Steel Element is completely polished for the fines Look & Feel
המסגרות עם הצירים שעברו תהליכי ציפוי אבץ, צבע יסוד ופיניש, מוכנות בחדר הצבע לשלב הצבע העליון - בשיטת צביעה רטובה איכותית
Preparations for Wet-Spray Painting. 100% Hand-Made

Fittings and accessories assembly & Quality Control station

Once the paint is completely dry, all Steel-Frames are carefully inspected. If the paint quality is perfect the element is moved to its final station.

In this station, the special fittings and accesories are assembeld: Handles, Locks, Stays, Gaskets etc. In This station The element is fixed to a special stand, and completely tested for its functionla features, and its look. Only a perfect product will be packed and shipped.



thermally insulated glass, a frame house, igu panels, thermally insulated glass, tuval minimal,steel window sliding, white steel windows, steel window with glass

ייצור "קאסטום" של אביזרים מפליז לחלונות בלגים מברזל
Custom Production of Steel-Windows fittings & Accesories

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Steel Windows & Doors |  Sliding Steel Doors |  Thermally-Broken Profiles

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Tuval Minimal – Metal Industries Ltd.  |  office@tuvalminimal.com  |  www.tuvalminimal.com

HQ & Show-Room – 29 Tamar St. Even-Yehuda |  Production Plant – Neve Tzuf Industrial Zone – Halamish 

©2017 by Tuval Minimal – Metal Industries Ltd

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