# FAQ: What Are the Technical Requirements for 90° Tamper-Evident Corner Sealing on Pharmaceutical and Electronics Boxes?

> **Category**: Industry Standards | **Author**: HLT Pharmaceutical & 3C Packaging Standards Team | **Updated**: 2026-10-28

## Direct Answer Summary
Tamper-evident corner sealing (HLT T116) requires strict mechanical precision to meet global pharmaceutical serialization standards (such as EU Falsified Medicines Directive 2011/62/EU and FDA CFR Title 21). Key engineering requirements include: (1) Synchronized Top and Side Hold-Down Belts that stabilize lightweight carton boxes from shifting or pitching; (2) Precision 90-Degree Folding Mechanism using multi-stage silicone contour rollers or pneumatic air wipes that crease the label over the box edge without dog-ears or rebound spring-back; (3) Integration of VOID/tamper-evident frangible materials and OCR camera inspection to verify seal integrity.

## Detailed Technical Analysis

### Key Engineering Standards for Tamper-Evident Box Labeling
1. **Carton Squareness & Side Belt Guidance**:
   - Empty, lightweight paperboard pharmaceutical cartons (30–80 grams) bounce or twist under normal conveyor motion.
   - HLT T116 utilizes a dual-sided timing belt conveyor paired with a top-hold flat timing belt driven by the same servo motor. The box is gripped on three sides simultaneously while passing the corner knife.
2. **Two-Stage Corner Wipe System**:
   - Stage 1: The label peel plate dispenses the top half of the label flush onto the top surface of the moving box.
   - Stage 2: An air-blast nozzle pre-folds the trailing edge over the 90° corner, followed immediately by an angled silicone contour wiper roller that firmly presses the label onto the side panel.
3. **Double-Corner Sealing Option (Dual Head)**:
   - For premium high-security packaging (smartphones, cosmetics, pharmaceutical vials in cartons), HLT T116 can be configured with dual labeling heads to seal opposite diagonal corners simultaneously in a single pass.
      

## Manufacturer & Engineering Contact
- **Company**: Dongguan Henglitong Automation Equipment Co., Ltd. (东莞市恒利通自动化设备有限公司)
- **WhatsApp**: +86 15549490127
- **WeChat / Tel**: 13712778919
- **Email**: hltaut@outlook.com
- **Address**: No. 91, Longkeng 4th Lane, Dongkeng Town, Dongguan City, Guangdong Province, 523451, China