Forming Device & Heat‑Sealing Technology by Jiangsu Hanyoo

For pharmaceutical, nutraceutical and veterinary blister production, consistent packaging quality mainly depends on two critical functional units: the forming device and the heat‑sealing module. Poor performance on either unit will lead to common defects including blister deformation, wrinkling, sealing delamination, foil burning and final package leakage. Jiangsu Hanyoo has optimized both core assemblies to resolve frequent industry pain‑points for long‑hour, high‑speed continuous production.

1. Precision Heat‑Sealing Technology: Eliminate Leakage & Delamination

Heat sealing directly decides the blister’s moisture‑proof and leak‑proof performance. Three interrelated parameters — sealing temperature, sealing pressure and feeding speed — must be precisely coordinated to obtain stable sealing quality.

Three core sealing parameters

Temperature regulation: Segmented multi‑zone independent heating is adopted. For aluminum‑plastic blister packs, the working temperature ranges from 120‑160℃. For double‑aluminum blister packs, higher compound sealing temperature of 180‑230℃ is required. Zoned temperature control prevents local overheating that causes foil or film burn‑through.

Sealing pressure: Pneumatic balanced pressure modules deliver pressure tolerance ≤0.02 MPa. Even pressure is distributed around every blister edge to avoid partial weak sealing.

Synchronized feeding speed: The film feeding rollers and sealing rolls are linked via PLC. Synchronized running keeps sealing integrity even under high‑volume mass‑production conditions.

Hanyoo Heat‑Sealing Module Technical Advantages

The toothed heating plates feature dense concave‑convex textures, expanding the lamination contact area and boosting sealing adhesion by 40%.

Heat‑insulation buffer pads block excess heat transfer and protect the machine’s internal electrical components. Abraded toothed plates can be individually replaced instead of swapping the whole heating assembly, effectively lowering module maintenance expenses.

Closed‑loop constant‑temperature control keeps temperature fluctuation within ±2℃, delivering reliable sealing results during prolonged non‑stop operation.

Troubleshooting of typical sealing defects

If manufacturers encounter weak sealing, delamination, burnt foil or wrinkled sealing edges, operators can adjust temperature and pressure directly on the machine’s touch‑screen. Remote engineering debugging support is also available for HANYOO users.

2. High‑Precision Forming Device: Shape Consistent Blister Cavities

The forming device thermo‑shapes PVC, PET or PA plastic sheets into blister cavities. There are two mainstream forming solutions for different blister depth requirements: vacuum negative‑pressure forming and positive‑pressure blow molding.

Two mainstream forming structures

Vacuum Negative‑Pressure Forming (Standard for Aluminum‑Plastic Blisters)

The plastic hard sheet gets softened inside the heating oven. The mold cavity generates vacuum suction so the softened film adheres tightly to the cavity surface before cooling and setting. It is ideal for shallow blisters for tablets and capsules. With lower energy consumption and compact footprint, this system is widely used on flat‑style blister packaging machines.

Positive Pressure Blow Molding (Specially for Deep Blisters)

Combining vacuum suction and high‑pressure air bidirectional stretching, it can achieve forming depth above 20 mm. This solution suits large‑size capsules, big‑granule health‑supplement tablets and vape‑related products, producing blister side walls that remain smooth without thinning or cracking.

Core advantages of Hanyoo forming units

The constant‑temperature infrared zoned heating oven guarantees uniform temperature distribution across the whole plastic sheet, preventing uneven wall‑thickness after forming.

High‑sealing vacuum chambers maintain stable negative‑pressure without attenuation, so blister shapes stay consistent even during long‑time high‑speed running.

Rapid water‑cooling modules instantly solidify the formed cavities to avoid product rebound and wrinkle defects.

Thanks to the quick‑release mold base, mold replacement can be finished within 5 minutes, significantly shortening change‑over time between different products.

Daily maintenance recommendations for forming assemblies

Regular cleaning of vacuum filters and carbon deposits on heating tubes is essential to sustain stable vacuum suction and heating efficiency. Spare parts for HANYOO forming devices adopt universal specifications, with fast spare‑part delivery supporting customers worldwide.

Final Words

Reliable forming and heat‑sealing performance lay the foundation for qualified blister packaging for medicines and dietary supplements. Jiangsu Hanyoo optimizes these two core stations for flat‑type blister machines, helping pharmaceutical and nutraceutical factories reduce packaging reject rates during daily production.