ꯑꯦꯛꯁꯁꯤ ꯃꯦꯗꯤꯀꯣ
ꯀ꯭ꯂꯤꯅꯤꯀꯦꯜ ꯑꯦꯀꯥꯗꯦꯃꯤ꯫

XC ꯃꯦꯗꯤꯀꯣ ꯃꯦꯇꯥꯂꯤꯛ ꯏꯃꯞꯂꯥꯟꯇ ꯄꯨꯝꯅꯃꯛ (ꯇꯥꯏꯇꯥꯅꯤꯌꯝ Ti-6Al-4V ꯑꯃꯁꯨꯡ 316L ꯁ꯭ꯇꯦꯅꯂꯦꯁ ꯁ꯭ꯇꯤꯜ) ꯑꯁꯤ ꯆꯨꯅꯕꯥ ꯌꯥꯏ꯫ ꯁ꯭ꯇꯤꯝ ꯑꯣꯇꯣꯛꯂꯦꯕ ꯁ꯭ꯇꯦꯔꯤꯂꯥꯏꯖꯦꯁꯟꯒꯥ 134 °C / 273°Fꯗꯥ ꯌꯥꯃꯗ꯭ꯔꯕꯗꯥ ꯃꯤꯅꯤꯠ 18 (ꯄ꯭ꯔꯤ-ꯚꯦꯛꯌꯨꯝ ꯁꯥꯏꯀꯜ) PEEK ꯏꯟꯇꯔꯕꯣꯗꯤ ꯀꯦꯖꯁꯤꯡꯒꯤ ꯑꯣꯏꯅꯗꯤ, ꯚꯦꯛꯌꯨꯃꯒꯤ ꯃꯃꯥꯡꯗꯥ ꯃꯤꯅꯠ 4 134°C ꯁꯤꯖꯤꯟꯅꯧ꯫ ꯏꯅꯁ꯭ꯠꯔꯨꯃꯦꯟꯇ ꯇ꯭ꯔꯦꯅꯁꯤꯡ ꯑꯁꯤ ꯁꯤꯉ꯭ꯒꯜ-ꯌꯨꯖ ꯄꯥꯎꯆꯦꯁꯤꯡꯗꯥ ꯀꯨꯄꯁꯤꯅꯒꯗꯕꯅꯤ꯫ ≤55°Cꯗꯥ EtO (ꯏꯊꯥꯏꯂꯤꯟ ꯑꯣꯛꯁꯥꯏꯗ) ꯁ꯭ꯇꯦꯔꯤꯂꯥꯏꯖꯦꯁꯟ ꯑꯁꯤ ꯍꯤꯠ-ꯁꯦꯟꯁꯤꯇꯤꯚ ꯀꯝꯄꯣꯅꯦꯟꯇꯁꯤꯡꯒꯤꯗꯃꯛꯇꯁꯨ ꯑꯌꯥꯕꯥ ꯄꯤꯈ꯭ꯔꯦ꯫ ꯀꯦꯃꯤꯀꯦꯜ/ ꯀꯣꯜꯗ ꯁ꯭ꯇꯦꯔꯤꯂꯥꯏꯖꯦꯁꯟ ꯂꯤꯛꯌꯨꯏꯗꯁꯤꯡ ꯁꯤꯖꯤꯟꯅꯒꯅꯨ ꯃꯔꯃꯗꯤ ꯃꯁꯤꯅꯥ ꯁꯔꯐꯦꯁ ​​ꯀꯣꯇꯤꯡꯁꯤꯡꯗꯥ ꯑꯀꯥꯌꯕꯥ ꯄꯤꯕꯥ ꯌꯥꯏ꯫ ꯁ꯭ꯇꯦꯔꯤꯂꯥꯏꯖꯦꯁꯟ ꯄ꯭ꯔꯣꯇꯣꯀꯣꯂꯁꯤꯡꯒꯤ ꯑꯀꯨꯞꯄꯥ ꯃꯔꯣꯂꯁꯤꯡ ꯌꯥꯎꯕꯥ ꯃꯄꯨꯡꯐꯥꯕꯥ ꯑꯥꯏ.ꯑꯦꯐ.ꯌꯨ.(ꯏꯟꯁ꯭ꯠꯔꯛꯁꯟ ꯐꯣꯔ ꯌꯨꯖ) ꯑꯁꯤ ꯄꯣꯠꯊꯣꯛ ꯈꯨꯗꯤꯡꯃꯛꯇꯥ ꯌꯥꯎꯏ꯫

ꯑꯦꯛꯁ.ꯁꯤ.ꯃꯦꯗꯤꯀꯣꯅꯥ ꯇꯤ-꯶ꯑꯦꯂ-꯴ꯚꯤ ꯏ.ꯑꯦꯜ.ꯑꯥꯏ.(ꯑꯦꯛꯁꯠꯔꯥ-ꯂꯣ ꯏꯟꯇꯔꯁ꯭ꯇꯤꯁꯤꯑꯦꯜ) ꯒ꯭ꯔꯦꯗ ꯲꯳ ꯁꯤꯖꯤꯟꯅꯩ꯫ ꯃꯦꯗꯤꯀꯦꯜ-ꯒ꯭ꯔꯦꯗ ꯁ꯭ꯇꯦꯟꯗꯔꯗ ꯑꯣꯏꯔꯤꯕꯥ ꯑꯦ.ꯑꯦꯁ.ꯇꯤ.ꯑꯦꯝ.ꯑꯦꯐ.꯱꯳꯶ꯀꯤ ꯃꯇꯨꯡ ꯏꯟꯅꯥ ꯃꯔꯨꯑꯣꯏꯕꯥ ꯃꯒꯨꯅꯁꯤꯡ: ꯇꯦꯟꯁꯥꯏꯜ ꯁ꯭ꯠꯔꯦꯡꯊ ≥860 MPa , ꯌꯤꯜꯗ ꯁ꯭ꯠꯔꯦꯡꯊ ≥795 MPa, ꯏꯂꯣꯡꯁꯟ ≥10%꯫ ꯑꯦꯂꯣꯌ ꯀꯝꯄꯣꯖꯤꯁꯟ ꯑꯁꯤ ꯹꯰% ꯇꯥꯏꯇꯅꯤꯌꯝ, ꯶% ꯑꯦꯂꯨꯃꯤꯅꯤꯌꯝ, ꯴% ꯚꯦꯅꯥꯗꯤꯌꯃꯅꯤ꯫ ꯕꯣꯟ ꯄ꯭ꯂꯦꯠꯁꯤꯡ ꯑꯃꯁꯨꯡ ꯁ꯭ꯛꯔꯨꯁꯤꯡ ꯑꯁꯤ ꯇꯥꯏꯞ II ꯑꯦꯅꯣꯗꯥꯏꯖꯦꯁꯟ ꯁꯔꯐꯦꯁ ​​ꯇ꯭ꯔꯤꯠꯃꯦꯟꯇ ꯑꯃꯥ ꯇꯧꯏ꯫ ꯀꯣꯔꯣꯁꯤꯟ ꯔꯦꯁꯤꯁ꯭ꯇꯦꯟꯁ ꯑꯃꯁꯨꯡ ꯑꯣꯁꯤꯑꯣꯏꯟꯠꯔꯤꯒ꯭ꯔꯦꯁꯟ ꯍꯦꯅꯒꯠꯍꯟꯅꯕꯥ ꯃꯁꯤꯒꯤ ꯑꯦꯂꯣꯌ ꯑꯁꯤ ꯄꯣꯠꯊꯣꯛ ꯂꯦꯕꯦꯂꯤꯡꯗꯥ ꯑꯀꯨꯞꯄꯥ ꯃꯔꯣꯜ ꯌꯥꯑꯣꯕꯥ ꯑꯀꯛꯅꯕꯥ ꯁ꯭ꯀꯦꯟ ꯀꯟꯗꯤꯁꯅꯁꯤꯡꯒꯥ ꯂꯣꯌꯅꯅꯥ ꯱.꯵ꯇꯤ ꯑꯃꯁꯨꯡ ꯳ꯇꯤꯗꯥ ꯑꯦꯝ.ꯑꯥꯔ.ꯑꯥꯏ.-ꯀꯟꯗꯤꯁꯅꯦꯜ ꯑꯣꯏ꯫

ꯇꯤꯇꯥꯅꯤꯌꯃꯗꯥ ꯌꯨꯝꯐꯝ ꯑꯣꯏꯕꯥ ꯑꯦꯛꯁ.ꯁꯤ.ꯃꯦꯗꯤꯀꯣ ꯏꯃꯞꯂꯥꯟꯇ ꯄꯨꯝꯅꯃꯛ ꯑꯁꯤ ꯑꯦꯝ.ꯑꯥꯔ.ꯀꯟꯗꯤꯁꯅꯦꯜ ꯑꯣꯏꯅꯥ ꯀ꯭ꯂꯥꯁꯤꯐꯥꯏ ꯇꯧꯏ꯫ ꯑꯦ.ꯑꯦꯁ.ꯇꯤ.ꯑꯦꯝ.ꯑꯦꯐ.꯲꯵꯰꯳ꯒꯤ ꯃꯇꯨꯡ ꯏꯟꯅꯥ ꯃꯈꯣꯌ ꯑꯁꯤ 1.5T ꯑꯃꯁꯨꯡ 3.0T ꯐꯤꯜꯗ ꯁ꯭ꯠꯔꯦꯡꯊꯇꯥ ꯁꯦꯐ ꯑꯣꯏ꯫ 720 G/cmꯒꯤ ꯃꯦꯛꯁꯤꯃꯝ ꯁ꯭ꯄꯦꯁꯤꯑꯦꯜ ꯒ꯭ꯔꯦꯗꯤꯌꯦꯟꯇ ꯂꯩꯕꯥ ꯁ꯭ꯇꯦꯅꯂꯦꯁ ꯁ꯭ꯇꯤꯜ ꯏꯃꯞꯂꯥꯟꯇꯁꯤꯡ (꯳꯱꯶ꯑꯦꯜ) ꯑꯁꯤꯁꯨ ꯑꯦꯝ.ꯑꯥꯔ.ꯀꯟꯗꯤꯁꯅꯦꯜ ꯑꯣꯏ ꯑꯗꯨꯕꯨ ꯍꯦꯟꯅꯥ ꯆꯥꯎꯕꯥ ꯏꯃꯦꯖ ꯑꯥꯔꯇꯤꯐꯦꯛꯇꯁꯤꯡ ꯊꯣꯀꯍꯅꯕꯥ ꯌꯥꯏ; ꯔꯦꯗꯤꯑꯣꯂꯣꯖꯤꯁ꯭ꯠ ꯑꯗꯨꯒꯥ ꯀꯣꯑꯣꯔꯗꯤꯅꯦꯠ ꯇꯧꯕꯥ꯫ ꯀ꯭ꯂꯤꯅꯤꯀꯦꯜ ꯑꯣꯏꯅꯥ ꯈꯨꯗꯛꯀꯤ ꯑꯣꯏꯕꯥ ꯃꯑꯣꯡꯗꯥ ꯏꯃꯞꯂꯥꯟꯇ ꯇꯧꯔꯕꯥ ꯃꯇꯨꯡ ꯅꯨꯃꯤꯠ 6ꯅꯤꯒꯤ ꯃꯅꯨꯡꯗꯥ ꯑꯦꯝ.ꯑꯥꯔ.ꯑꯥꯏ. ꯑꯀꯛꯅꯕꯥ ꯑꯦꯁ.ꯑꯦ.ꯑꯥꯔ.(ꯁ꯭ꯄꯦꯁꯤꯐꯤꯛ ꯑꯦꯕꯁꯣꯔꯄꯁꯟ ꯔꯦꯠ) ꯂꯤꯃꯤꯠꯁꯤꯡ ꯑꯃꯁꯨꯡ ꯄꯣꯖꯤꯁꯟ ꯇꯧꯕꯒꯤ ꯑꯊꯤꯡꯕꯁꯤꯡ ꯑꯁꯤ ꯃꯊꯛꯇꯥ ꯄꯅꯈ꯭ꯔꯤꯕꯥ ꯔꯤꯁꯣꯔꯁ ꯁꯦꯟꯇꯔꯗꯥ ꯐꯪꯂꯤꯕꯥ ꯃꯤꯑꯣꯏ ꯑꯃꯒꯤ ꯄꯣꯠꯊꯣꯛ ꯑꯥꯏ.ꯑꯦꯐ.ꯌꯨ.

ꯔꯤꯀꯃꯦꯟꯗ ꯇꯧꯔꯕꯥ ꯑꯔꯣꯏꯕꯥ ꯇꯩꯁꯤꯅꯕꯥ ꯇꯣꯔꯀꯁꯤꯡ ꯑꯁꯤ ꯁ꯭ꯛꯔꯨ ꯗꯥꯏꯑꯦꯃꯤꯇꯔꯒꯤ ꯃꯇꯨꯡꯏꯟꯅꯥ ꯈꯦꯠꯅꯩ: 3.5mm ꯀꯣꯔꯇꯤꯀꯦꯜ ꯁ꯭ꯛꯔꯨꯁꯤꯡ: 1.2–1.5 Nm , 4.5mm ꯀꯣꯔꯇꯤꯀꯦꯜ ꯁ꯭ꯛꯔꯨꯁꯤꯡ: 2.0–2.5 Nm , 5.0mm ꯂꯣꯀꯤꯡ ꯁ꯭ꯛꯔꯨꯁꯤꯡ: 2.8–3.2 Nm , 6.5mm ꯀꯦꯟꯁꯦꯜ ꯁ꯭ꯛꯔꯨꯁꯤꯡ: 3.5–4.0 Nm . ꯃꯇꯝ ꯄꯨꯝꯅꯃꯛꯇꯥ ꯀꯦꯂꯤꯕ꯭ꯔꯦꯠ ꯇꯧꯔꯕꯥ ꯇꯣꯔꯛ-ꯂꯤꯃꯤꯇꯤꯡ ꯁ꯭ꯛꯔꯨ ꯗ꯭ꯔꯥꯏꯚꯔ ꯑꯃꯥ ꯁꯤꯖꯤꯟꯅꯧ ꯑꯃꯁꯨꯡ ꯂꯣꯀꯤꯡ ꯃꯦꯀꯥꯅꯤꯖꯝ ꯑꯗꯨ ꯂꯧꯊꯣꯀꯄꯥ ꯅꯠꯠꯔꯒꯥ ꯀꯣꯜꯗ-ꯋꯦꯜꯗꯤꯡ ꯇꯧꯗꯅꯕꯥ ꯀꯩꯗꯧꯉꯩꯗꯥ ꯃꯦꯛꯁꯤꯃꯝ ꯇꯣꯔꯛ ꯑꯗꯨꯗꯒꯤ ꯍꯦꯜꯂꯣꯏꯗꯕꯅꯤ꯫ ꯀꯔꯤꯒꯨꯝꯕꯥ ꯑꯔꯣꯏꯕꯥ ꯊꯣꯡꯗꯥ ꯌꯧꯗ꯭ꯔꯤꯉꯩꯗꯥ ꯏꯅꯁꯥꯔꯁ ꯇꯧꯕꯥ ꯃꯇꯃꯗꯥ ꯃꯦꯟꯌꯨꯑꯦꯜ ꯔꯦꯁꯤꯁ꯭ꯇꯦꯟꯁ ꯑꯃꯥ ꯐꯥꯑꯣꯔꯕꯗꯤ, ꯑꯆꯨꯝꯕꯥ ꯗ꯭ꯔꯥꯏꯜ ꯒꯥꯏꯗ ꯁ꯭ꯂꯤꯚ ꯑꯗꯨꯒꯥ ꯂꯣꯌꯅꯅꯥ ꯗ꯭ꯔꯥꯏꯜ ꯍꯣꯜ ꯗꯥꯏꯑꯦꯃꯤꯇꯔ ꯑꯗꯨ ꯊꯤꯡꯖꯤꯜꯂꯨ ꯑꯃꯁꯨꯡ ꯚꯦꯔꯤꯐꯥꯏ ꯇꯧ꯫ ꯁ꯭ꯠꯔꯤꯞ ꯂꯣꯀꯤꯡ ꯁ꯭ꯛꯔꯨꯁꯤꯡ ꯑꯁꯤ ꯇꯣꯉꯥꯟꯅꯥ ꯐꯪꯒꯗꯕꯥ ꯑꯈꯟꯅꯕꯥ ꯔꯤꯃꯨꯚꯜ ꯀꯤꯠ ꯑꯃꯥ ꯃꯊꯧ ꯇꯥꯏ꯫

ꯑꯁꯣꯏ-ꯑꯉꯥꯝ ꯌꯥꯑꯣꯗꯕꯥ ꯁ꯭ꯇꯦꯔꯤꯜ ꯄꯦꯀꯦꯖꯤꯡꯗꯥ ꯂꯩꯕꯥ XC ꯃꯦꯗꯤꯀꯣ ꯏꯃꯞꯂꯥꯟꯇꯁꯤꯡ ꯑꯁꯤ ꯆꯍꯤ ꯵ꯒꯤ ꯁꯦꯂꯐꯝ ꯂꯩ (ꯂꯦꯕꯦꯜ ꯌꯦꯡꯕꯤꯌꯨ)꯫ ꯁꯥꯕꯥ ꯇꯥꯡꯗꯒꯤ ꯁ꯭ꯇꯣꯔꯦꯖ ꯀꯟꯗꯤꯁꯅꯁꯤꯡ: ꯇꯦꯝꯄꯦꯔꯦꯆꯔ +5°Cꯗꯒꯤ +30°C ꯐꯥꯎꯕꯥ , ꯔꯤꯂꯦꯇꯤꯚ ꯍꯨꯃꯤꯗꯤꯇꯤ 15–85% ꯅꯟ-ꯀꯟꯗꯦꯟꯁꯤꯡ , ꯍꯀꯊꯦꯡꯅꯅꯥ ꯅꯨꯃꯤꯠꯀꯤ ꯃꯉꯥꯜ ꯑꯃꯁꯨꯡ ꯀꯣꯔꯣꯁꯤꯚ ꯀꯦꯃꯤꯀꯦꯂꯁꯤꯡꯗꯒꯤ ꯂꯥꯞꯅꯥ ꯂꯩꯕꯥ꯫ ꯄꯉ꯭ꯀꯆꯔ, ꯃꯩꯁꯥ, ꯅꯠꯠꯔꯒꯥ ꯀꯝꯞꯔꯦꯁꯅꯒꯤ ꯑꯃꯥꯡ-ꯑꯇꯥꯁꯤꯡ ꯎꯠꯄꯥ ꯄꯦꯀꯦꯖꯤꯡ ꯑꯃꯍꯦꯛꯇꯕꯨ ꯀ꯭ꯕꯥꯔꯦꯟꯇꯥꯏꯟ ꯇꯧꯒꯗꯕꯅꯤ ꯑꯃꯁꯨꯡ ꯁꯤꯖꯤꯟꯅꯔꯣꯏꯗꯕꯅꯤ꯫ ꯄꯤ.ꯏ.ꯏ.ꯀꯦ. ꯑꯃꯁꯨꯡ ꯔꯤꯁꯣꯔꯕꯦꯕꯜ ꯀꯝꯄꯣꯅꯦꯟꯇꯁꯤꯡꯅꯥ ꯁꯦꯂꯐꯃꯒꯤ ꯃꯇꯝ ꯀꯨꯏꯅꯥ ꯂꯩꯕꯥ ꯌꯥꯏ (ꯃꯍꯧꯁꯥꯅꯥ ꯆꯍꯤ 3) — ꯃꯇꯝ ꯄꯨꯝꯅꯃꯛꯇꯥ ꯃꯤꯑꯣꯏ ꯑꯃꯒꯤ ꯄꯣꯠꯊꯣꯛ ꯑꯗꯨꯒꯤ ꯂꯦꯕꯦꯜ ꯑꯗꯨ ꯆꯦꯛ ꯇꯧ꯫ ꯇ꯭ꯔꯦꯁꯤꯕꯤꯂꯤꯇꯤ ꯔꯦꯀꯣꯔꯗꯁꯤꯡ (ꯂꯣꯠ ꯅꯝꯕꯔ, ꯑꯦꯛꯁꯄꯥꯏꯔꯤ, ꯄꯦꯁꯦꯟꯇ ꯁꯤꯖꯤꯟꯅꯕꯥ) ꯑꯁꯤ ꯂꯣꯀꯦꯜ ꯑꯦꯝ.ꯗꯤ.ꯑꯥꯔ.

ꯑꯦꯛꯁ.ꯁꯤ.ꯃꯦꯗꯤꯀꯣꯅꯥ ꯃꯈꯥꯗꯥ ꯄꯤꯔꯤꯕꯥ ꯁꯔꯇꯤꯐꯤꯀꯦꯁꯅꯁꯤꯡ ꯑꯁꯤ ꯊꯝꯂꯤ: ꯑꯥꯏ.ꯑꯦꯁ.ꯑꯣ.꯱꯳꯴꯸꯵:꯲꯰꯱꯶ (ꯀ꯭ꯕꯥꯂꯤꯇꯤ ꯃꯦꯅꯦꯖꯃꯦꯟꯇ ꯁꯤꯁ꯭ꯇꯦꯝ), ꯏ.ꯌꯨ.ꯑꯦꯝ.ꯗꯤ.ꯑꯥꯔ.꯲꯰꯱꯷/꯷꯴꯵ (ꯀ꯭ꯂꯥꯁ IIb)ꯒꯤ ꯃꯈꯥꯗꯥ ꯁꯤ.ꯏ.ꯃꯥꯔꯀꯤꯡ, ꯑꯃꯁꯨꯡ ꯁꯤ.ꯑꯦꯐ.ꯗꯤ.ꯑꯦ./ꯑꯦꯟ.ꯑꯦꯝ.ꯄꯤ.ꯑꯦ . ꯆꯥꯏꯅꯥꯒꯤ ꯀꯩꯊꯦꯂꯒꯤꯗꯃꯛꯇꯥ ꯑꯀꯛꯅꯕꯥ ꯀꯩꯊꯦꯂꯁꯤꯡꯗꯥ ꯆꯠꯅꯕꯥ ꯌꯥꯕꯥ ꯄꯣꯠꯊꯣꯀꯁꯤꯡꯅꯥ ꯑꯍꯦꯅꯕꯥ ꯂꯣꯀꯦꯜ ꯑꯦꯞꯔꯨꯕꯦꯂꯁꯤꯡ ꯄꯨꯔꯀꯄꯥ ꯌꯥꯏ — ꯅꯍꯥꯛꯀꯤ ꯔꯤꯖꯅꯦꯜ ꯁꯦꯂꯁ ꯀꯟꯇꯦꯛꯇꯇꯥ ꯀꯟꯁꯂꯇꯦꯁꯟ ꯇꯧꯕꯤꯌꯨ꯫ ꯑꯣ.ꯏ.ꯑꯦꯝ.ꯒꯤ ꯄꯥꯔꯇꯅꯔꯁꯤꯡꯅꯥ ꯑꯩꯈꯣꯌꯒꯤ ꯔꯦꯒꯨꯂꯦꯇꯔꯤ ꯑꯦꯐꯦꯌꯔꯁ ꯇꯤꯃꯗꯒꯤ ꯑꯣꯗꯤꯠ ꯔꯤꯄꯣꯔꯇꯁꯤꯡ ꯑꯃꯁꯨꯡ ꯗꯤꯛꯂꯥꯔꯦꯁꯟ ꯑꯣꯐ ꯀꯅꯐꯣꯔꯃꯤꯇꯤ ꯗꯣꯀꯨꯃꯦꯟꯇꯁꯤꯡ ꯔꯤꯛꯕꯦꯁ꯭ꯠ ꯇꯧꯕꯥ ꯌꯥꯏ꯫ ꯑꯩꯈꯣꯌꯅꯥ ꯍꯧꯖꯤꯛ ꯌꯨ.ꯑꯦꯁ.ꯀꯤ ꯀꯩꯊꯦꯂꯒꯤꯗꯃꯛ ꯑꯦꯐ.ꯗꯤ.ꯑꯦ.꯵꯱꯰(ꯀꯦ) ꯀ꯭ꯂꯤꯌꯔꯦꯟꯁ ꯊꯃꯗꯦ; ꯆꯥꯅꯕꯤꯗꯨꯅꯥ ꯌꯨ.ꯑꯦꯁ.ꯇꯥ ꯌꯨꯝꯐꯝ ꯑꯣꯏꯕꯥ ꯏꯅꯚꯦꯟꯇꯔꯤꯒꯤ ꯑꯣꯔꯗꯔ ꯄꯤꯗ꯭ꯔꯤꯉꯩꯒꯤ ꯃꯃꯥꯡꯗꯥ ꯃꯥꯔꯀꯦꯠ ꯏꯂꯤꯖꯤꯕꯤꯂꯤꯇꯤ ꯀꯅꯐꯥꯔꯝ ꯇꯧꯕꯤꯌꯨ꯫