IML Technical Principles & Process Workflow_Technical Support

IML Technical Principles & Process Workflow

Author:SWITEK

Release Date:2026.08.26

What Are the Technical Principles and Specific Process Workflow of In-Mold Labels (IML)?

In-mold labeling involves embedding pre-printed labels directly into the mold cavity during the blow molding or injection molding process, fusing the labels with the plastic container into one. Below is a detailed analysis of the complete IML process workflow during blow molding/injection molding.

I. Five-Step IML Workflow for Blow Molding / Injection Molding

01. Label Stacking Preparation Pre-Printed Stacking

Neatly stack the pre-printed in-mold labels (divided into front labels and back labels) in individual sheets, and accurately place them respectively in the two dedicated material boxes of the IML machine.

02. Robot Label Suction & Placement High-Precision Positioning

When the bottle mold opens, the automated robot precisely picks up the front and back labels, keeping the printed side facing inward and the solid adhesive side facing outward, and accurately places them into both mold cavities.

03. Vacuum Suction Fixation Stable & Anti-Displacement

Small vacuum holes on the mold rapidly generate negative pressure, firmly suctioning the labels entering the mold cavity onto the inner mold wall, preventing misalignment during the subsequent blow molding/injection molding stamping process.

04. Blow Molding Mold Closing & Expansion High-Temperature Molding

When the heated plastic material in tube form sags down, the mold with labels closes rapidly and high-pressure air is blown in, causing the soft plastic to closely adhere to the inner mold wall and the labels.

05. Hot Melt Integration & Mold Opening Perfect Fusion

The high temperature inside the mold cavity melts the solid adhesive on the back of the labels, fully combining them with the bottle prototype. After cooling, the mold opens, the container is formed, and the labels have already integrated with the bottle body.

II. Summary & Exchange

The entire IML process relies on seamless coordination between high-precision automated robots and injection/blow molding machines. Precise label suction, placement, and vacuum control are the key to ensuring labeling without bubbles, wrinkles, or misalignment.

SWITEK focuses on high-speed automated in-mold labeling (IML) robots and full-line system solutions. If you need to improve your IML production efficiency and yield rate, please feel free to contact us!

SWITEK Contact Information

WhatsApp/WeChat/Phone: +86 18665171961

Website: www.switek.com.cn

Address: No. 5, Tangbian Nanwei Industrial Park, Chashan Town, Dongguan City, Guangdong Province

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