Japanese Hair Straightening 日本式負離子直髮

Japanese Hair Straightening — The Science, Benefits and Who It’s Best For
日本式負離子直髮 — 原理、優點與適合髮質

(中文版請到下方)


Japanese Hair Straightening is one of the most advanced hair-smoothing systems in the world. Unlike temporary treatments, this process permanently restructures your hair’s bonds, giving a sleek, straight look that lasts for months.


The Science Behind Japanese Hair Straightening


The treatment works by breaking down the protein bonds in the hair shaft that determine your natural curl pattern. A special chemical solution (usually containing cysteamine or ammonium thioglycolate) softens the internal structure of each hair strand. After the solution is applied, the stylist uses a flat iron under controlled temperature to reshape the hair into a perfectly straight form. Finally, a neutralising lotion is used to reform the bonds — this time in the new straight configuration. The result is smooth, shiny, and straight hair that retains its structure even after washing or drying. Because the change happens inside the hair cortex, it’s considered a permanent treatment (the treated sections remain straight until new hair grows).


Benefits of Japanese Hair Straightening


  • Permanent results: Once done, the hair remains straight until it grows out.
  • Sleek, glossy finish: The hair cuticle lies flat, reflecting light for a mirror-like shine.
  • Low maintenance: No need for daily straightening; simply wash and air-dry.
  • Suitable for humid climates: Even in damp Scottish weather, the hair stays smooth and frizz-free.


At Jan Liu Hair Salon, we use premium Japanese systems Shiseido Professional, ensuring the perfect balance between straightening power and hair protection.


Suitable Hair Types


Japanese Hair Straightening is ideal for:

  • Natural frizzy, coarse, or wavy hair
  • Asian or mixed-texture hair that resists keratin treatments
  • Clients seeking long-term straightness and smoothness


However, it is not suitable for:

  • Hair that has been heavily bleached or over-processed
  • Fragile, thin, or severely damaged hair


Before every treatment, we perform a strand test to assess hair condition. This ensures the process is safe and effective for your specific hair type.


Japanese Straightening VS. Keratin Treatment


Many clients confuse Japanese Hair Straightening with Keratin Smoothing.

Here’s the difference:

Japanese Hair Straightening

Type: Permanent chemical restructuring

Result: Fully straight hair

Duration: 6–12 months (until new growth)

Suitable for: Strong, healthy hair


Keratin Treatment      

Type: Temporary smoothing   

Result: Smooth but natural texture   

Duration: 3–4 months   

Suitable for: Slightly frizzy or dry hair 

 

So, if your goal is permanent straight hair, Japanese straightening is the better choice. But if you want temporary smoothness and less heat, keratin may be enough.


Aftercare and Maintenance Tips


To keep your hair healthy and shiny after treatment:

  1. Avoid washing your hair for 72 hours after the procedure.
  2. Use sulphate-free shampoo and conditioner to maintain smoothness.
  3. Avoid tying or clipping your hair during the first few days.
  4. Schedule regular trimming and deep-conditioning treatments (e.g. Olaplex) to maintain strength and shine.
  5. When new hair grows, you can repeat the straightening process only on the regrowth areas.


FAQ


Q: How long does Japanese Hair Straightening last?
A: It usually lasts 6–12 months. Only new growth needs to be re-treated.


Q: Can coloured hair be straightened?
A: Yes, if the hair is in good condition. However, we do not recommend this treatment on bleached or double-processed hair.


Japanese Hair Straightening is the ultimate solution for smooth, sleek and manageable hair. At Jan Liu Hair Salon Edinburgh, we are trained in authentic Japanese systems in Shiseido. Whether you have Asian, frizzy, or thick hair, we’ll create a personalised plan to achieve lasting shine and confidence. Book your consultation today at  JanLiu Hair Salon.


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日本式負離子直髮(Japanese Hair Straightening) 是一項來自日本的高階美髮技術。與一般臨時性護理（例如 Keratin）不同，負離子直髮屬於 永久性髮質重組，可維持數月至一年以上。


技術原理


日本式負離子直髮的核心在於「重組頭髮內部蛋白鍵結」。


療程分為三個主要步驟：

  1. 軟化階段：使用含 胱胺酸 (Cysteamine) 或 巰基乙酸銨 (Ammonium Thioglycolate) 的藥水，暫時打開頭髮的角蛋白結構，使髮絲變得柔軟可塑。
  2. 高溫重整階段：由專業髮型師以 溫控直髮夾 精準拉直，使髮絲重新塑形成直線結構。
  3. 定型階段：以中和劑固定新形態的蛋白鍵結，令頭髮恢復強韌但保持筆直。


整個過程使頭髮結構徹底改變，因此屬「永久直髮」。只要新髮長出，已處理部分依然保持直順。


優點


  • 效果持久：一次療程可維持 6–12 個月，期間無需每日夾直。
  • 光澤自然：頭髮表層角質層平滑排列，反射光線更亮麗。
  • 極低維護：洗頭後自然吹乾即平直柔順。
  • 抗濕氣：即使在蘇格蘭潮濕天氣下，髮絲仍不會捲曲或毛燥。


Jan Liu Hair 使用 日本原裝 Shiseido Professional 系統，平衡拉直力與護髮度，確保頭髮健康柔韌。


適合與不適合的髮質


適合：

  • 自然捲、毛燥、粗硬髮質
  • 亞洲或混合性髮質（難以維持直髮者）
  • 想長期保持筆直造型的顧客


不適合：

  • 經漂染或嚴重化學損傷的髮質
  • 極細、脆弱或經常上色的頭髮


療程前，我們會先進行 髮束測試 (strand test)，確保髮質安全、能承受藥劑。


與 Keratin Treatment 的分別


日本式負離子直髮

原理: 化學重組蛋白鍵結

效果: 永久筆直

適用: 髮質強韌、健康髮

熱度: 高溫定型


Keratin 蛋白護理

原理: 蛋白覆膜柔順表層

效果: 暫時柔順（約3–4個月）

適用: 毛燥、乾燥髮

熱度: 中低溫封膜


若想要 完全筆直、長效造型，建議選擇日本式負離子直髮；若只想暫時柔順或減少毛燥，則可考慮 Keratin。


療程後護理建議


為保持頭髮健康與光澤，請遵守以下建議：

  1. 療程後 72 小時內避免洗頭或綁髮。
  2. 使用 無矽、無硫酸鹽洗護產品。
  3. 初期避免使用髮夾、髮圈等製造折痕。
  4. 定期修剪髮尾與進行 深層護理（如 Olaplex）。
  5. 下次補強只需處理新長出部分，不必重做整頭。


常見問題


Q：日本式負離子直髮效果可維持多久？
A：一般 6–12 個月，視頭髮生長速度與日常護理而定。

Q：染過的頭髮可以做嗎？
A：可以，但需確保髮質健康。若為漂染或重複燙染髮質，建議避免進行此療程。


日本式負離子直髮是一項結合科學與美感的專業技術，能夠讓頭髮由內而外重組，達致 順直、光澤、持久自然 的效果。在 Jan Liu Hair Salon，我們擁有多年經驗，使用 日本原廠系統Shiseido與專業溫控技術，為每位顧客設計最合適的強制方案。歡迎預約服務 JanLiu Hair Salon