カテゴリー: ブログ

廃タイヤ＆ELVシュレッダー刃：トン当たり処理コスト（Cost Per Ton）を削減する硬度と靭性の最適バランス

Quick Answer: Balance hardness (wear resistance) against Charpy impact toughness rather than maximizing HRC alone—DC53 at 58–60 HRC delivers roughly double D2’s impact toughness for contaminated tire/ELV streams, while a documented real-world case shows that fracture at mounting-hole geometry, not material hardness, is often the true root cause. Scope: This guide focuses primarily on primary and pre-shredding applications for whole scrap tires and mixed ELV feedstocks, where steel reinforcement, tramp metal, impact loading, and abrasive contamination are significant. Secondary rubber granulation and clean wire-free crumb processing require a different wear-versus-toughness balance. Scrap tire recycling and end-of-life vehicle (ELV) size reduction represent two of the most mechanically demanding environments in industrial waste processing. […]

スリット粉じん（Slitting Dust）発生の根本原因解析：刃物側面Ra、炭化物組織＆芯出し公差

これら4つの原則は、Maxtor Metalのアプリケーションチームが、軟包装、不織布、特殊紙ラインにおけるゼロダスト・コンバーティングプログラム向けに円形スリッターナイフを評価・選定する際に適用するエンジニアリングフレームワークを構成しています。高速軟包装、産業用テキスタイル、不織布、および特殊紙のコンバーティングにおいて、微粒子による汚染は、計画外のライン停止を引き起こす主な原因となっています。工場のオペレーターが「ウェブ張力の不足」や「原反ロールの欠陥」としばしば診断するトラブルは、多くの場合、シェアカットポイントで発生する「スリット粉の発生」という単一の根本原因に突き当たります。微細なポリマー片、繊維くず、または無機コーティング粒子がスリットされたウェブロールに蓄積すると、後工程で不具合が発生します。光学検査システムが誤った欠陥アラームをトリガーしたり、印刷インキに[…]

産業用ストリップナイフの再研磨：研削・再研磨の閾値、破棄（スクラップ）基準、およびライフサイクルコストモデル

Quick Answer: Regrinding industrial strip blades is economical when: chipping depth is under 0.5 mm, remaining thickness is above 60–70% of nominal, and the estimated regrind cost is below 50% of a new replacement blade. The minimum safe stock removal is 0.010–0.015 in (0.254–0.381 mm) to clear the subsurface micro-fractured fatigue layer. Blades with radial cracks, thermal burn below HRC 52, or thickness below the 60–70% threshold must be scrapped. A managed regrind program typically yields 3–5 precision cycles per blade and can reduce annual knife consumable costs by 45–60% compared to a disposable replacement strategy. In continuous coil processing and high-speed slitting operations, knife consumables represent one of the most […]

M390 vs CPM S90V 粉末冶金ペレタイザーナイフ：高ガラス繊維摩耗下における鋼種選定

Quick answer: For pelletizing blades under high glass-fiber wear, powder metallurgy stainless steels outperform conventional tool steels because their fine, uniform carbide distribution resists micro-ploughing without the toughness trade-offs of high-alloy ingot steels. Between M390 and CPM S90V: choose CPM S90V when abrasion load is the dominant failure mode (>30% GF, neutral water); choose M390 when corrosion resistance, thin blade geometry, or multi-resin flexibility is the priority. Both require cryogenic post-quench treatment and PM-specific grinding protocols to reach their rated HRC and edge geometry. Powder metallurgy (PM) stainless steel, in the context of pelletizer blade manufacturing, refers to steels produced by atomizing molten alloy into fine powder, then consolidating under heat […]

シャーブレード用 D2 vs SKD11 工具鋼：炭化物組織、破損モード解析、および鋼種選定フレームワーク

Quick Answer: D2 and SKD11 are compositionally near-identical high-carbon, high-chromium cold-work tool steels, but D2’s higher vanadium content (0.50–1.10%) delivers stronger abrasive wear resistance for clean, high-volume sub-6mm cutting, while SKD11’s finer carbide structure provides better impact toughness for stainless steel, variable feed, or chipping-prone operations. The decision turns on your dominant failure mode—wear or chipping—not the grade label alone. ESR refining quality from your supplier matters as much as the designation. Engineering Note: D2 vs SKD11 tool steel selection for shearing blades is a carbide microstructure decision, not a brand substitution. Both grades occupy the same ledeburitic cold-work steel family (high-C, high-Cr), and their nominal composition windows overlap substantially across ASTM […]

スリッターのカエリ（バリ）低減：根本原因マトリックス・設定条件・検査プロトコル

Slitting burr reduction is one of those “small edge” problems that becomes a big cost problem fast: burr drives customer complaints, creates downstream forming issues, and quietly shortens knife life. This handbook is compiled by Jerry Chu, Technical Support Specialist at Maxtor Metal, drawing on 10+ years of field troubleshooting experience across coil slitting lines processing carbon steel, AHSS, stainless, and aluminum. It is peer-reviewed by Maxtor Metal’s application engineering team and written in a practical, verification-first spirit where the winning approach is disciplined setup windows, fast root-cause isolation, and consistent measurement. If your line uses roller shearing blades (or equivalent slitter knife systems), the principles below still apply: treat the cut […]

RDF/SRF破砕処理効率向上に向けた長尺物の発生根絶：カッター刃物形状、スクリーン開口率（OAR）、剪断ギャップコントロール

Long-strip “rejects” are a hidden tax in RDF/SRF production. They don’t just fail a sieve-based spec—they drive recirculation load, increase wrap risk, and quietly push kWh/t up while pulling throughput down. This article lays out the engineering moves to engineer out long strips and consistently hit ≤50 mm at ≥98% passing (P98) on screen-limited sizing lines. Quick Answer: Key takeaway: Treat long strips as a system problem (geometry + screen capacity + gap control + feed stability). Fixing only one lever rarely holds P98 in real mixed-waste variability. Root causes Flexible films and textiles Flexible polymers and fibrous fractions (films, big-bag scraps, textiles, straps) tend to elongate, fold, and “draw through” the cutting zone. […]

フィルムスリット加工の蛇行切断を防止：刃物・張力・アライメント・エア圧のシステムチェックリスト

スネークカット（スリットラインの蛇行またはドリフトとも呼ばれます）は、スリットエッジが直線的かつ再現性のある経路を維持できなくなったときに発生する現象です。レーンが「蛇行」したり、振動したり、徐々にシフトしたりすることで、巻き取られたロールの層が中心からずれてしまいます。これは単一のパラメータの欠陥ではなく、スリット・巻き取りシステム全体の安定性の問題として捉える必要があります。このチェックリストは、多くのメンテナンスチームやプロセスチームが現場でこの問題をデバッグする方法を反映しています。これは、セットアップ時には問題がないように見えるカットが、高速運転時に不安定になる原因をトラブルシューティングする際に、Maxtor Metalのフィールドエンジニアリングチームが使用する診断手順に基づいています。重要なポイント：スネークカットが速度、ロールの巻き径、またはレーン位置によって変化する場合は、まず横方向の[…]がどこで発生しているかを特定することから始めてください。

帯鋼・スリッター刃用工具鋼ミルシート（MTC）の精読法：成分組成・硬度・トレーサビリティのための実践的QA（品質保証）チェックリスト

Quick Answer: To read a tool steel MTC for strip blades, start at the header — confirm EN 10204 3.1 certificate type, supplier identity, steel grade, and heat number. Then cross-check the chemistry table against your PO/spec (using ASTM A681 or ISO 4957 as the reference standard). Verify hardness uniformity with a 9-point map (head/mid/tail × edge/center/edge per ASTM E18), and add a decarburization check (ASTM E1077) when edge performance is critical. The heat number must link the MTC, the coil tag, and your internal lot records to form a complete traceability chain. In strip-blade manufacturing, a tool steel MTC is only useful if it helps you make a fast, […]

TPU水中ペレタイジングナイフの樹脂ガミング現象：DLC vs PTFEコーティングの選定と最適運転条件（Operating Window）

Quick answer: Knife gumming in TPU underwater pelletizing is a system problem, not just a coating problem. The fastest fix is to address the mechanism first (restore cutting-plane stability and quench consistency), then select coatings: DLC on cutting-edge faces for hardness and low friction, PTFE on low-wear non-edge faces for adhesion reduction. Running DLC without fixing alignment or thermal drift rarely holds — validated operating windows and KPI logging are what make gains stick. Knife gumming in TPU underwater (die-face) pelletizing usually shows up the same way: pellet surfaces start to smear, tails (often called angel hair on the shop floor) increase, and fines climb until the dryer screens or water filters tell […]