JallyTalk-Demark Laser

Test Results on Our Wood‑Specific Laser Cleaning Equipment – A Personal Update from Jally, Founder of DMK



Following our earlier post about wood cleaning, I’d like to share the latest test results from our team. We’ve been actively searching for various sample pieces and running extensive trials on different varnishes and oil‑based paints used on wooden furniture. Now we have some concrete findings to present.


What Makes This Machine Different

This device is the outcome of six months of dedicated R&D by our team at DMK. We specifically targeted wood’s well‑known sensitivity to heat and its tendency to accumulate thermal energy. The optimizations we made – in beam quality, pulse control, and scanning patterns – now allow us to effectively strip single‑component and two‑component polyurethane and epoxy varnishes that were previously very difficult, if not impossible, to remove with conventional lasers. More importantly, we achieve this without burning or charring the wood. Based on our tests, I’m confident that this machine covers the vast majority of wood cleaning applications.


Performance Highlights


For single‑component epoxy and polyurethane varnishes, our equipment delivers fast and effective cleaning – roughly 1.5 times the efficiency of traditional Gaussian‑beam lasers. That alone is a solid improvement.


But the real breakthrough is with two‑component epoxy and polyurethane varnishes. Conventional lasers simply could not handle them. Why? Because after curing with a hardener, these varnishes form a hard, wear‑resistant film. Wood’s natural roughness gives them exceptional adhesion, and their transparent surface absorbs very little laser energy. Forcing the process only caused heat buildup and scorched the wood. Our redesigned system, however, uses a tailored beam profile, refined pulsing, and optimised scanning trajectories to minimise heat penetration, reduce accumulation, and provide just enough removal force – so we can now strip two‑component varnishes cleanly and safely.


Key Points to Keep in Mind When Cleaning Varnishes

From our hands‑on experience, I want to emphasise two practical considerations:

Solid wood vs. plywood – Solid wood is generally much easier to clean. Many plywoods use resin‑based adhesives that bond extremely strongly with epoxy varnishes, making stripping difficult. While plywood is often lower in value and less likely to be laser‑cleaned in real‑world jobs, it’s still critical to identify the substrate before you start.


Wood density matters – Higher‑density woods (rosewood, ebony, teak, oak) have compact lignin structures and fewer voids, so heat accumulates slowly and the thermal damage threshold is higher – they are relatively forgiving. Low‑density woods like pine, fir, and paulownia are much more challenging; their porous structure traps heat quickly, and even a slightly longer laser dwell time can cause scorching.
For those, I strongly recommend lowering the power and increasing the scanning speed to stay well below the damage threshold.


Why I Believe Laser Cleaning Is a Great Path for Wood


As the founder of DMK, I see laser cleaning as an exceptionally promising niche for wood restoration and refinishing. Traditional sanding inevitably removes a thin layer of wood and alters the surface. Chemical strippers can penetrate deep into the grain and leave residues. Laser cleaning, on the other hand, is non‑contact, chemical‑free, relatively fast, and produces no hazardous waste. For antique restoration, residential renovation, and high‑end furniture refurbishment, the market potential and technical advantages are enormous – and we’re just getting started.


I hope these insights are helpful. We’ll continue to refine our technology and welcome any feedback or questions from the community.

– Jally, Founder of DMK

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5 days ago | [YT] | 10

JallyTalk-Demark Laser

DMK LASER代表のJallyです。いつも弊社製品をご愛顧いただき、誠にありがとうございます。

この度、2026年9月16日（水）～19日（土）、東京ビッグサイトにて開催される『国際ウェルディングショー』に出展いたします。

私も現地ブースに立ち、皆様と直接お会いして技術交流ができることを心から楽しみにしております！🤝

🌟 今回の自慢のラインナップ
✅ 年間販売台数No.1の信頼！洗浄ヘッド重量わずか1.55kgで、作業負担を大幅に軽減した最新パルスレーザー洗浄機。
✅ 最新1000W空冷式モデルが初お披露目！連続波とパルスのハイブリッドで、コストを50%削減しながらも高効率・精密加工を実現しました。

「スマートプロセス＆先端技術」をテーマに、レーザー洗浄・溶接・切断・マーキングまで、最新鋭のソリューションを一挙公開します。

📍 私たちが待っている場所
📅 期間：2026年9月16日(水)〜19日(土)
🏛️ 会場：東京ビッグサイト 西展示棟 2ホール
🏢 ブース番号：2-20-5
(〒135-0063 東京都江東区有明3丁目11番1号)

ぜひブースへお越しいただき、私や技術スタッフと直接お話ししましょう！
皆様にお会いできるのを、心よりお待ちしております！✨

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6 days ago | [YT] | 5

JallyTalk-Demark Laser

Think your wood is impossible to clean? We’re tackling the toughest wood-cleaning challenges on the market!

We’re developing a dedicated laser cleaning system optimized specifically for wood – and we’re offering gifts in exchange for your samples.

By fine-tuning the optical path, improving beam quality, and refining scanning patterns, we’ve made wood cleaning easier and more effective than ever. Tests on common coatings – varnish, oil-based paint, and water-based paint – show results far superior to traditional Gaussian beam equipment. What’s more, our unit achieves about 1.5× the cleaning efficiency of conventional laser cleaners with the same power.

But with so many wood types and finishes out there, we can’t source them all ourselves – and that’s where you come in. We challenge you: send us any wood samples that have defeated your previous laser attempts. No restrictions on wood type or surface contaminants. Our engineers will test them and send you a video of the results.

Everyone who submits a sample gets a gift or a generous discount coupon for DMK’s new wood laser! The campaign runs from July 31 to August 31 – don’t miss out. Join the challenge today!

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2 weeks ago (edited) | [YT] | 3

JallyTalk-Demark Laser

Since the launch of DMKLaser's annual procurement festival, we've delivered over 20 core three‑piece solutions. This number may not be huge, but to me and my team, it means over 20 customers who chose to bet on our delivery capability and service commitment.

Anyone in this industry knows that a good machine isn't about the price tag on any single component – it's about whether the entire system runs reliably, delivers on time, and stays cost‑effective to maintain over the long haul. What we do is simply help our customers solve all these problems in one go.

A big thank you to our partners Raycus, Raytools,SUP, BOchu, S&A, and above all, to every customer who chose DMK. We're still on this journey, pushing forward.

The festival continues. I'm always open for conversations. DM me if you're interested.

——Jally

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3 weeks ago | [YT] | 7

JallyTalk-Demark Laser

From stepping into this industry over 20 years ago to today — I want to say thank you to every customer who has trusted DMK.


I'm Jally, founder of DMK Laser. When I first entered the laser industry more than two decades ago, I never imagined that one day our equipment would be running in factories across so many countries around the world.

Along this journey, what I'm most proud of is not how many machines we've sold, but the customers who chose us, trusted us, and even helped us become better.

Some of you started with a single handheld welder and now run fully automated production lines. Some began as small local workshops and now serve end-users in over a dozen countries. Some of you messaged me late at night when you ran into installation issues, and we stayed up together until we found a solution.

These are the moments that remind me: building laser equipment is not about a one‑time deal — it's a long‑term responsibility.

That's why we launched our "Machine Sourcing Festival" this third quarter — not to chase sales numbers, but to give back to our new and old friends in a more tangible way.
The Core 3‑Piece Package (laser source + processing head/control system + chiller) comes directly from tier‑1 channels, with full traceability. Raycus lasers carry a 26‑month warranty, counted from our shipping date.


This isn't an ad. It's my personal commitment, as founder, to everyone who puts their trust in DMK.

Drop a comment and share your story with DMK — whether you're a long‑time partner or just getting to know us, I'd love to hear from you.

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1 month ago | [YT] | 12

JallyTalk-Demark Laser

What a joyful day! 🎉
Cake 🍰, gifts 🎁, flowers 💐, games 🎮—and the warmest company of my wonderful colleagues. Today, DMKlaser held our group birthday party, and I was truly honored to be one of the birthday celebrants alongside our amazing team.

To all my colleagues: may your work always thrive, and as for me—well, I’ll keep wishing myself forever young, forever eighteen! 😄

We were also delighted to have our friends from Brazil join the celebration during their DMK laser technology training. It was a double celebration, as they received their DMK certification today! A big congratulations to these three talented engineers and to every birthday star among us.

Thank you for all the love and cheer. Here’s to many more sweet moments together.

——With heartfelt best wishes, Jally

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1 month ago | [YT] | 9

JallyTalk-Demark Laser

The Dragon Boat Festival traces back over two thousand years to a journey rooted in the spirit of "safeguarding."
Dragon boat races honor heroic souls, while the fragrance of *zongzi* leaves pays tribute to loyal spirits.

Today, DMK takes up the baton of this "safeguarding" legacy—
Yet, we sculpt time with light and define quality through precision.

May your life strike happiness with laser-like precision;
May our endeavors forge ahead, cutting through waves at full speed like a dragon boat.

While *zongzi* offer a myriad of flavors, light possesses immense, mighty power.
Wishing you a peaceful and healthy Dragon Boat Festival; DMK is here to safeguard you with the passion of light.

2 months ago | [YT] | 4

JallyTalk-Demark Laser

Laser Cleaning Heads Enter the 2.0 Era



Today, we are introducing two newly upgraded cleaning heads and the significant improvements they offer.

Following R&D, finalization, and rigorous testing, our new cleaning heads—compatible with 100W–1000W pulsed lasers—were officially launched last month. Key upgrades include:



1. Cleaning width increased to 200mm, significantly boosting efficiency
Previously, the maximum cleaning width was only 110mm. After incorporating customer feedback and analyzing market trends, we redesigned the galvanometer, optical path, and f-theta lens to expand the cleaning width to 200mm without compromising beam quality. This improvement substantially increases operational efficiency in applications such as removing surface rust and cleaning narrow workpieces.



2. Added status indicator light for enhanced operational safety
While this feature was present on earlier low-power air-cooled models, it was previously removed to accommodate expanded cleaning functions. Since laser cleaning machines utilize an invisible 1064nm infrared laser, we have added an integrated front-and-rear status indicator light to warn nearby personnel and clearly signal the laser's operating status.



3. Flip-cover protection to prevent accidental operation
The flip-cover protection feature on the GT-500 cleaning head was highly acclaimed for effectively preventing issues such as accidental laser firing or firing with the lens cap still attached. We have retained this design on the new 100–300W pulsed cleaning heads, receiving positive market feedback.



4. Ergonomic emergency stop button included as standard
Previously, emergency stop buttons were optional add-ons with less-than-ideal aesthetics, even though some countries mandate their inclusion. To further enhance safety and mitigate accident risks, both new cleaning heads come standard with an emergency stop button. In an emergency, a simple press with the thumb cuts off power, the laser beam, and the gas supply, eliminating potential hazards.



5. Fully equipped as standard—more features at no extra cost
In the past, features like "laser-off on defocus" and emergency stop buttons were optional extras requiring additional payment. Our standard cleaning heads now come fully integrated with features such as beam cutoff upon defocus, dual-red-dot assisted focusing, an emergency stop button, status indicator lights, a rotatable control screen, and a protective flip cover; additionally, an optional cleaning head work light can be added at no extra cost depending on the operating environment. Furthermore, models with power ratings below 300W feature a standard fiber-bend protection design to prevent costly damage caused by fiber breakage.



From the very beginning of R&D, the development of our two laser cleaning heads has centered on two core priorities: genuine customer needs and operational safety. We carefully incorporated user feedback regarding cleaning efficiency and ease of use, increasing the maximum scan width from 110mm to 200mm and adopting a "standard-means-fully-loaded" approach—delivering enhanced capabilities without raising the price. At the same time, we have elevated safety standards to an unprecedented level; features such as status indicators, protective flip covers, and emergency stop buttons across the entire lineup are designed to maximize the safety of operators and on-site personnel during operations involving invisible infrared laser beams. This upgrade represents not only a revolution in product performance but also a tangible demonstration of our commitment to our customers and our deep respect for safety.

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2 months ago | [YT] | 12

JallyTalk-Demark Laser

High-End MOPA Laser Marking Application: High-Brightness Mirror-Finish Laser Engraving
💡 Technical Principle: From Micro-Level "Melt-Smoothing" to Macro-Level "Mirror Finish"
At its core, this technology is a process of physical modification rather than a chemical reaction. It alters the surface's microscopic topography by using a laser heat source to remelt the material.
Laser Surface "Melt-Smoothing": The essence of high-brightness laser engraving lies in focusing a high-power continuous laser beam (typically with processing power >120W and peak power up to 200W) onto the aluminum alloy surface. This generates intense heat instantaneously, rapidly melting the surface metal into a liquid state.
Physical Rearrangement and Solidification: Driven by surface tension, the molten metal flows naturally to fill in existing microscopic irregularities. Subsequently, the metal cools and resolidifies rapidly, creating a new, flat, and glossy surface.
"Roughness" as an Advantage, Not a Hindrance: A slightly rough aluminum alloy surface absorbs laser energy more effectively; conversely, an overly smooth surface (such as a highly reflective mirror finish) reflects most of the laser energy, making processing difficult. Therefore, surfaces prepared via processes like sandblasting provide an ideal "canvas" for the subsequent mirror-finish marking.
The final result is influenced by parameters such as laser power, scanning speed, and fill spacing, as well as the specific aluminum alloy material. There are three typical application workflows: laser marking followed by overall anodizing (yields the best results; suitable for high-end electronics); anodizing followed by laser marking (simpler process but damages the oxide layer; suitable for small-batch modifications); and laser marking after sandblasting (creates a brilliant logo against a matte background; used for automotive interiors, sports equipment, etc.).

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2 months ago | [YT] | 2

JallyTalk-Demark Laser

Why does the workpiece turn black after laser rust removal, even though the rust is gone?

There are five main reasons why the material turns black after laser rust removal.
First, thermal damage caused by laser energy. If the laser power is too high or the scanning speed is too slow, the laser dwells on the same area for too long; continuous heat accumulation causes ablation or remelting of the metal substrate surface, forming a black oxide layer. Even with pulsed lasers, if the repetition frequency is too high—preventing heat from the previous pulse from dissipating—subsequent pulses can cause a cumulative thermal effect, ultimately leading to oxidation and blackening.
Second, high‑temperature oxidation reactions. The high temperatures generated during laser rust removal cause the metal substrate to react with atmospheric oxygen, producing black oxides such as iron(II,III) oxide (magnetite). This is the most common cause of blackening when operating in an air environment.
Third, the transformation of rust types—which is not necessarily a bad thing. Yellow‑brown goethite can transform into black magnetite under laser action; this transformed layer is denser, more stable, and even offers some protective qualities, though it still appears black.
Fourth, differences in laser characteristics. Continuous‑wave lasers deliver constant energy, leading to significant heat accumulation and a high risk of substrate remelting and severe oxidation, resulting in pronounced blackening. Standard pulsed lasers, due to their extremely short pulse durations, exhibit “cold processing” characteristics—heat does not have time to conduct deep into the substrate, so blackening is minimal. However, high‑power multimode pulsed lasers—despite being pulsed—can still cause heat accumulation due to the combination of high power and high frequency. Additionally, multimode flat‑top beams may require higher total energy to remove the rust layer, or localized overheating at the beam edges can occur, potentially leading to blackening.
Fifth, the initial state of the material. If the original rust layer contains a large amount of tightly bonded black rust, the laser’s removal efficiency is reduced, and the residual black rust makes the surface appear black.

To address these causes of blackening, the following solutions are primarily employed.

First, optimize laser process parameters—this is the most critical measure. Specific actions include: appropriately lowering laser power to identify the energy threshold that removes rust without damaging the substrate; increasing scanning speed to reduce dwell time per point and minimize heat accumulation; lowering pulse frequency to prevent thermal overlap from successive pulses; maintaining a beam overlap rate between 20% and 50%; and optimizing pulse duration based on material properties, as excessively short pulses risk substrate damage while excessively long pulses increase the heat‑affected zone.

Second, enhance surface cooling. Using a blower or air knife during the cleaning process offers two benefits: it prevents removed contaminants from re‑adhering to the surface and helps lower the workpiece temperature, thereby suppressing high‑temperature oxidation reactions at the source and yielding a bright metal finish.

Third, select the appropriate laser type based on the material and the condition of the rust. For large areas with thick rust layers where surface quality requirements are less stringent, continuous‑wave (CW) lasers can be used to prioritize efficiency, accepting a certain degree of surface darkening. For high‑precision, high‑value components where substrate integrity is paramount, single‑mode or low‑power pulsed lasers—combined with a shielding gas—are preferable. In cases of heavy rust where laser treatment alone may be insufficient, consider mechanical pre‑treatment or alternative rust removal methods.

In summary, the darkening associated with laser rust removal is primarily caused by oxidation or ablation resulting from uncontrolled heat management. The solution lies in reducing heat input, accelerating heat dissipation, and fine‑tuning parameters such as power, speed, frequency, and overlap rate to strike the optimal balance between cleaning effectiveness and thermal damage. I hope this information proves helpful.

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2 months ago | [YT] | 11