En savoir plus sur les sacs en plastique scellés

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b) Structure et fonctionnement de la machine de découpe de joints de sacs en plastique

Le principe de fonctionnement de la machine de découpe de joints de sacs en plastique est différent et également beaucoup plus compliqué que la machine de découpe et de scellage de fond de sac normale. Sur les rouleaux de film plastique tubulaire, la soudeuse de fond de sachet n'effectue qu'une seule opération horizontale de découpe et de soudure pour fabriquer un produit. Comme pour le sac scellé, la machine doit couper et sceller 2 lignes parallèles pour former 2 côtés du sac.

Mais en premier lieu, le coupeur de sceau doit effectuer une déchirure d'un côté du rouleau de nylon pour former l'embouchure du sac. Cette coupe sera sur un côté du côté du rouleau en plastique lors de la production d'un sac scellé avec une bouche plate, ou à une petite distance du bord du rouleau lorsque vous souhaitez produire un sac en plastique avec un couvercle collé. Le rouleau de nylon après avoir été arraché d'un côté, passera parfois à travers les rouleaux pour fixer la bande adhésive, ou pressera les tyroliennes lorsque vous souhaitez produire des sacs à fermeture éclair, avant d'être emmené par le convoyeur vers le coupe-scellage pour le thermoscellage. Les coupe-joints qui utilisent un seul rouleau de film n'auront pas de partie de déchirure, mais à la place un système qui double la membrane avec des cadres de pliage mécaniques.

On peut dire que la machine à sceller le fond du sac produit des sacs dans le sens vertical et ne façonne que le fond du sac, tandis que la découpeuse de scellage produit des sacs dans le sens horizontal et façonne simultanément les deux côtés et l'embouchure du sac.

Les coupe-scellés ont également de nombreuses variantes ou accessoires tels que des cadres pliants, des moules de poinçonnage ou des cutters qui peuvent être ajoutés pour produire des sacs plus complexes tels que : des sacs pliants à fond, des sacs à découper des scellés à 2 étages avec des trous de suspension.

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