The film is produced through a sequential biaxial orientation process followed by a controlled heat setting stage. This manufacturing method creates a product that combines the inherent stiffness and moisture barrier of BOPP with a carefully balanced shrink force. Unlike conventional BOPP films that are dimensionally stable, Shrinkable Heat Sealable BOPP Film retains a controlled level of internal stress that allows it to shrink when exposed to hot air tunnels, steam tunnels, or infrared heating systems. At the same time, its heat sealable layer is formulated to bond at relatively low temperatures, making it compatible with high-speed flow wrappers, overwrapping machines, and shrink sleeve equipment.
HUA HENG offers this film in multiple grades tailored to different end-use requirements. Standard grades provide balanced shrinkage for general purpose packaging, while high-shrink grades deliver increased transverse direction shrinkage for contoured products such as bottles, cans, boxes, and multi-packs. The heat sealable layer can be customized as a single-side seal or a two-side seal depending on the packaging machine configuration and the desired seal strength. The film is available in clear, white, and metallized versions, with optional treatments for printing, lamination, or cold seal reception.
The film is designed with several performance characteristics that address common packaging challenges. The following features are consistently verified through inline quality control and laboratory testing before shipment:
HUA HENG has invested heavily in precision film production lines and quality management systems to deliver consistent product performance. The company operates under ISO 9001 and ISO 14001 certified management systems, with additional compliance available for food contact materials according to FDA 21 CFR 177.1520 and EU Regulation 10/2011. Each film batch is tested for thickness uniformity, shrinkage balance, seal strength, optical properties, and surface treatment before release.
HUA HENG also provides technical support for packaging line optimization. Application engineers can assist with selecting the right film grade, adjusting sealing temperatures, tuning shrink tunnel profiles, and troubleshooting common issues such as dog ears, burn-through, or uneven shrinkage. This level of support reduces downtime and helps packaging operations achieve higher throughput with lower material waste.
The company maintains strategic raw material partnerships to ensure stable resin supply and consistent formulation. Production planning is flexible enough to accommodate both large volume orders and smaller trial quantities, with lead times typically ranging from 15 to 30 days depending on film thickness, width, and surface treatment requirements.
What is the difference between Shrinkable Heat Sealable BOPP Film and standard BOPP film?
Standard BOPP film is dimensionally stable and typically used for printing, lamination, or non-shrink overwrap applications. Shrinkable Heat Sealable BOPP Film is manufactured with a controlled level of internal stress that remains in the film after orientation. When exposed to heat from a shrink tunnel or oven, this internal stress is released, causing the film to shrink tightly around the product. In addition, the film includes a heat sealable layer that allows it to be sealed to itself or to certain substrates without additional adhesives.
What shrinkage values can be expected from this film?
Standard HUA HENG grades typically provide machine direction shrinkage of 5% to 15% and transverse direction shrinkage of 8% to 25% when tested at 120°C for 5 minutes. The exact shrinkage depends on the film thickness, grade, and heat exposure conditions. High-shrink grades can be formulated to achieve transverse direction shrinkage up to 30% if required for deep-draw or highly contoured products.
What sealing temperatures are recommended ?
The optimal sealing temperature range is generally between 110°C and 145°C, depending on the film thickness, dwell time, and sealing pressure. For high-speed packaging lines, a temperature of 125°C to 135°C with a dwell time of 0.3 to 0.8 seconds and jaw pressure of 2 to 4 bar is a good starting point. HUA HENG recommends running a small trial to determine the optimum settings for each specific packaging machine and product configuration.
Can this film be printed on?
Yes. The non-seal side of Shrinkable Heat Sealable BOPP Film can be corona treated to a surface energy of 38 to 42 dyne/cm, making it suitable for flexographic or gravure printing with standard BOPP-compatible inks. The printed surface remains dimensionally stable enough for high-quality graphics reproduction, while the seal side remains functional for heat sealing. For metallized versions, printing can be applied after metallization or the film can be supplied with a print primer.
Does the film generate any static electricity during unwinding or shrinking?
BOPP films can generate static charges during high-speed unwinding and shrinking, especially in dry environments. HUA HENG offers antistatic grades with surface resistivity values typically in the range of 10^9 to 10^11 ohms/square. These grades help dissipate static charge and reduce dust attraction, film clinging, and operator discomfort. For applications where static control is critical, HUA HENG recommends specifying the antistatic version at the quotation stage.
