Feature and advantage

According to the performance comparison data of the films in the picture, PEF film (secondary inflated PEF) has the following core advantages compared to other films: 
1. High transparency and glossiness 
Glossiness ≥ 80% (significantly higher than 20-60% of PE film, on par with POF) 
Haze<8% (excellent transparency, far superior to 10-30% of PE film) 
Enhance the appearance and texture of the packaging, and improve the display effect of the product. 
2.  Excellent mechanical performance 
Tensile strength  120-140 MPa (far exceeding the 25-50 MPa of PE film and 70-120 MPa of POF) 
Strong tensile performance, suitable for packaging heavy or fragile items. 
3. High transverse shrinkage rate 
Lateral shrinkage rate 40%~70% (significantly higher than PE film's 5%~35%, and also better than POF's 45%~50%) 
Suitable for irregularly shaped products that require tight wrapping, with better adhesion. 
4. Low temperature shrinkage characteristics 
Shrinkage temperature 95~110 ℃ (lower than 113 ℃ for POF and 120 ℃ for PE) 
Reduce energy consumption and minimize the risk of damage to thermal sensitive contents.

5. Flexible heat sealing adaptability 
Support  heat sealing and cutting sealing (same as PE, better than POF that only supports cutting sealing) 
Compatible with more sealing processes to improve production efficiency. 
6.  Balanced thickness range 
Can produce 8-40 μ m (covering the thin specification range of POF and thinner than PE) 
Balancing lightweight and functional requirements. 
Summary 
PEF film exhibits outstanding performance in transparency, mechanical strength, lateral shrinkage ability, and low-temperature performance, especially suitable for packaging scenarios that require high display, strong protection, and energy-saving production (such as high-end consumer goods, food, etc.). Its heat sealing flexibility further expands its application range, and its comprehensive performance is superior to conventional POF and one-time formed PE film.

Application Description

1. Beverage packaging: high barrier juice bottles 
2.Heat shrink film: Packaging for electronic and daily chemical products 
3. High end cosmetics packaging: perfume bottle 
4. Fiber composite bottle: beer and carbonated beverages 
5. Sustainable food packaging: biodegradable films and containers 


 

Secondary molding PEF heat shrink filmTechnical Introduction 

Thin Film Shrinking Principle

Heat shrink film is manufactured using plastic resin through molecular chain stretching and orientation principles, formed via 
rapid cooling and shaping. The process works as follows: When the polymer is in a highly elastic state, it undergoes stretching and 
orientation. Subsequently, the polymer is rapidly cooled below its glass transition temperature, freezing molecular orientation. 
During packaging heating, molecular thermal motion induces stress relaxation. This causes macromolecular chains to deorient and 
return to their original state and dimensions. As the material transitions from an ordered to disordered state, it generates significant 
clamping force that tightly encapsulates the product.

The mechanical properties of the film are largely determined by the degree of order of macromolecules.

The degree of order in macromolecules determines the possibility of contraction

Blow-up Equipment and Principle

Comparison of Different Regeneration Methods

Thin Film Structure Comparison

The PE film is blown once and the tPE film layer structure is blown twice

Secondary blowing expands the conventional POF interlayer structure

PEF meets the requirements of single material of polyethylene film, and can also achieve high performance of film through processing technology.

Film Performance Comparison

 The contraction temperature was glycerol medium, and the test was carried out afer soaking for 20s 
SFPE has lower shrinkage temperature,higher strength and better heat

SFPE has lower shrinkage temperature,higher strength and better heat sealing performance than POF

Scope of application

Packaging beverages, handicrafts, wooden boards, door panels, sports equipment, and more