Recently, a customer contacted HANTENCNC to inquire about purchasing a 300W laser cleaning machine for restoring old building facades, wooden doors, wooden stairs, windows, and other small objects. He is considering a 15 mJ model, but He has also been recommended a 5 MJ one. He asks us to provide guidance on choosing the right laser cleaner for old buildings. This post mainly discusses how to choose the right laser cleaner for old buildings.
1. About Ancient Building Cleaning
Building cleaning involves removing oxidation layers or graffiti from building surfaces, revealing the original color of the underlying stone, and restoring the building’s original charm.
Commonly, the oxidation layer is complex in composition; it is often a mixture of various substances. Common oxidation layers include biological attachments such as moss, calcium carbonate crusts, and sulfide deposits, and some iron-containing stones may produce iron oxide, as seen on the surfaces of some stelae in the Lingyan Temple in Changqing, Shandong Province.
Ancient buildings are extremely precious. The primary principle of cleaning work is to protect the stone structure itself and prevent any damage. Traditional methods, such as mechanical grinding or chemical cleaning, have their own applications, but all carry the risk of damage or residual issues.
Traditional methods, like mechanical grinding and polishing, may wear away the precious historical surface, and chemical agents may remain, eroding the stone’s interior. But laser cleaning can make effective cleaning while ensuring no damage to the object.
2. Does Laser Cleaning Damage the Historic Buildings?
The wavelength of laser cleaning is 1060-1080 nm, belonging to the near-infrared spectrum with relatively low photon energy.
As an emerging cleaning technology, when a laser irradiates the stone surface, the calcium carbonate substrate absorbs very little energy and reacts very little. However, contaminants adhering to the surface—such as iron oxide, calcium sulfate scale, moss, etc.—have high absorption rates for the laser.
After absorbing laser energy, contaminants rapidly heat and expand, breaking their bond with the stone surface and peeling off the substrate. The entire process does not damage the stone itself, achieving non-damage cleaning.
Therefore, laser cleaning can achieve excellent cleaning results for most architectural stone materials, without damaging the historic building.
3. How to Choose a Right Laser Cleaning Machine for Old building?
Many companies, even individual sellers, want to buy a “one-size-fits-all” laser cleaning machine for cleaning ancient buildings, wood, and industrial surfaces.
However, using the wrong laser cleaner can severely damage ancient buildings. To be honest, there is no such machine as a universal laser cleaning machine.
Based on 20 years of experience and numerous application cases with laser cleaning machines, HANTENCNC strongly recommends that, for historical building cleaning, a pulse laser cleaner is the right choice. The core technology of pulse laser cleaning is the cold treatment of the material surface, and the power of the laser cleaning machine cannot be too high.
Until now, HANTENCNC has provided pulse laser cleaning machines with power options ranging from 100W to 2000W and maximum single-pulse energies of 5mJ, 15mJ, 50mJ, and 100mJ (customizable).
For historical building restoration, we recommend choosing a laser cleaning machine with a power of 500W or below 500W, paired with a maximum single-pulse energy of 15 mJ, to achieve the optimal balance between cleaning efficiency and material non-destructiveness.
The following sections contain video demonstrations of exterior building cleaning provided by HANTENCNC’s clients for feedback.
4. Real Customer Cases from HANTENCNC
To understand the practical applications and cleaning effects of HANTENCNC’s laser cleaning machine in building restoration applications, the following are some real customer feedback from HANTENCNC for your reference.
4.1 Ancient Building Laser Cleaning
4.2 Laser Cleaning Graffiti Cases
4.3 Laser Renovation of Building Facades - REAL HANTENCNC Cases
5. HANTENCNC Recommended Models
In conclusion, choosing the right cleaning equipment means finding the best balance between cleaning efficiency and non-destructive protection.
What HANTENCNC recommends is not just laser cleaner models that have been thoroughly tested, but also safety standards and professional commitment derived from numerous historical building restoration cases worldwide.
To help you make a decision more quickly, below are our most widely used and highly praised best-selling models in architectural cleaning projects:
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