{"id":2805,"date":"2026-06-03T02:41:39","date_gmt":"2026-06-03T02:41:39","guid":{"rendered":"https:\/\/cenwanpack.com\/?p=2805"},"modified":"2026-06-03T02:41:39","modified_gmt":"2026-06-03T02:41:39","slug":"pre-folding-mechanism","status":"publish","type":"post","link":"https:\/\/cenwanpack.com\/ar\/blog\/pre-folding-mechanism\/","title":{"rendered":"\u0622\u0644\u064a\u0627\u062a \u0627\u0644\u0637\u064a \u0627\u0644\u0645\u0633\u0628\u0642 \u0641\u064a \u0622\u0644\u0627\u062a \u0644\u0635\u0642 \u0627\u0644\u0645\u062c\u0644\u062f\u0627\u062a: \u062a\u0633\u0644\u0633\u0644\u0627\u062a 180\u00b0 \u0645\u0642\u0627\u0628\u0644 160\u00b0"},"content":{"rendered":"
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Pre-Folding Mechanisms in Folder Gluer Machines: 180\u00b0 vs 160\u00b0 Sequences matter when a carton blank must enter main folding with enough crease memory, but without cracks, skew, or glue-line drift.<\/p>\n

This guide explains what each pre-fold angle does, how 180\u00b0 and 160\u00b0 sequences fit different box styles, and what to ask for when buying a folder gluer machine.<\/p>\n<\/header>\n

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Quick Specs<\/h2>\n
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Common first-line pre-fold<\/strong>
\n180\u00b0 when the first crease needs a strong pre-break before side folding.<\/div>\n
Cenwan sequence reference<\/strong>
\n180\u00b0 first-line and 160\u00b0 third-line work is described on Cenwan’s folder gluer machine page.<\/div>\n
Public spec caution<\/strong>
\nPublic equipment literature also shows 135\u00b0 and 165\u00b0 third-line values, so 160\u00b0 should be specified by machine and carton need.<\/div>\n
Best RFQ proof<\/strong>
\nSend the blank drawing, FEFCO style, board grade, flute or paper weight, speed target, and glue type.<\/div>\n<\/div>\n<\/section>\n
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What The Pre-Folding Section Does Before Main Folding<\/h2>\n

\"What<\/p>\n

In a folder gluer, a cut and creased blank moves through a feed section, alignment guides, pre-folding devices, glue application, main folding, compression, counting, and stacker delivery. Early in that path, the pre-folding section opens selected crease lines enough that the later folding process can finish the box with lower resistance.<\/p>\n

That early movement creates fold memory. When fold memory is right, the blank tracks squarely, the glue tab meets its target, and the compression belt can hold the joint while the adhesive sets. When it is wrong, the carton can spring back, skew, wrinkle, crack on the score, or meet the glue wheel at the wrong time.<\/p>\n

Sequence matters because different creases serve different jobs. Straight-line cartons usually need the first and third lines prepared before the main side folding action. Crash-lock bottom cartons add bottom hook movements and more timing risk. 4\/6-corner cartons add more folding arms and a different timing map. For those jobs, angle alone is not enough; the machine must place the angle in the correct sequence.<\/p>\n

If you are comparing folder gluers, start with the box type and the blank. Performance on a straight-line folder gluer<\/a> is judged differently from a crash-lock bottom folder gluer<\/a> or a 4\/6-corner folder gluer<\/a>. Correct pre-folding helps the blank enter glue, side folding, main folding, and compression with the least correction.<\/p>\n<\/section>\n

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180 Degree First-Line Pre-Fold: Why The First Break Is Aggressive<\/h2>\n

\"180<\/p>\n

During a 180 degree first-line pre-fold, the first crease moves close to a full reverse movement before the blank reaches the later folding section. That aggressive pre-break can help a carton folder gluer machine when the first panel must return predictably and align with the glue flap during main folding.<\/p>\n

Public equipment specifications commonly show 180 degree pre-fold or pre-break capability for the first crease. Mechanically, the first fold line often needs a strong memory because it is involved in the final square of the carton. If that crease resists the later fold, the blank can pull against side guides or shift the glue line.<\/p>\n

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Advantages<\/h3>\n