{"id":3887,"date":"2026-10-20T08:15:20","date_gmt":"2026-10-20T08:15:20","guid":{"rendered":"https:\/\/tadapack.com\/news\/v-grooving-machine-setup-scoring-depth-tolerances-for-90-corners\/"},"modified":"2026-10-20T08:15:20","modified_gmt":"2026-10-20T08:15:20","slug":"v-grooving-machine-setup-scoring-depth-tolerances-for-90-corners","status":"publish","type":"post","link":"https:\/\/tadapack.com\/news\/v-grooving-machine-setup-scoring-depth-tolerances-for-90-corners\/","title":{"rendered":"V-Grooving Machine Setup: Scoring Depth Tolerances for 90\u00b0 Corners"},"content":{"rendered":"
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\u3010TL;DR Executive Direct Answer\u3011<\/strong><\/p>\n

For 1.0\u20132.5mm laminated grayboard, set V-groove scoring depth to 55\u201365% of measured board caliper (e.g., 0.55\u20130.70mm on 1.2mm board) with blade tip depth tolerance of \u00b10.10mm to achieve clean, fiber-controlled 90-degree corners without cracking or through-cuts. Verify setup under ISO 186:2020 conditioning (23\u00b0C \u00b1 1\u00b0C, 50% \u00b1 2% RH) and release the lot only when groove registration holds within \u00b10.15mm across the full die sheet.<\/p>\n<\/div>\n

Luxury rigid packaging demand in 2026 continues to shift toward sharper corner geometry \u2014 magnet-close rigid boxes, hinged lid-and-base sets, and book-style collector packaging all depend on knife-crisp 90-degree folds that wrapping gluing lines can run at speed. This guide anchors that trend where it belongs: in the physics of the V-grooving operation itself, and in the tolerances your procurement team should write into every rigid box specification. All numerical worked examples below are hypothetical engineering scenarios for illustration; validate against your own board lots and machine trials.<\/p>\n

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\n \"V-Grooving\n <\/div>
Figure: Packaging Design Overview (V-Grooving Machine Setup: Scoring Depth Tolerances for 90\u00b0 Corners)<\/figcaption><\/figure>\n

1. V-Grooving Mechanics: Why Depth Controls Corner Quality<\/h2>\n

V-grooving (also called V-cutting or notching) removes a triangular section of grayboard along the fold line, leaving a thin live hinge of board material. When the board folds, the remaining web acts as a controlled fiber hinge; the geometry of the removed wedge \u2014 included angle (typically 80\u00b0\u2013120\u00b0), depth, and residual web thickness \u2014 determines whether the folded corner is crisp, rounded, cracked, or broken through.<\/p>\n