Are you familiar with BOPP film?

● BOPP is the abbreviation of 'Biaxially Oriented Polypropylene'—a biaxially oriented polypropylene (film). 'B' stands for biaxial, 'O' for orientation, and 'PP' for polypropylene. ● BOPP film processing began in the 1950s–60s. Its performance is significantly superior to that of non-oriented films, and its application scope in the packaging industry has continuously expanded; BOPP processing has developed rapidly. ● BOPP film production technology was first invented in 1958 by Montecatini of Italy. Industrial-scale production commenced in 1962, initially monopolized by companies in Europe, the U.S., and Japan. Since then, BOPP film development has progressed rapidly: today, over 200 manufacturers worldwide operate nearly 500 production lines. 1. Introduction to Polypropylene (PP) Raw Material ● Polypropylene (PP) is a high-molecular compound synthesized via polymerization of propylene (CH₃–CH=CH₂), with the basic structural unit: CH₃ –C–C– H H ● PP has a low specific gravity (0.90–0.91), highly regular molecular structure, and high crystallinity, conferring excellent heat resistance—capable of continuous use at 120°C. It is non-hygroscopic, exhibits good chemical stability and electrical properties, is easy to process, and is non-toxic. Thus, it enjoys broad applications—from household goods to electrical insulation materials. However, PP also has drawbacks: poor low-temperature toughness, insufficient transparency, and inadequate rigidity at elevated temperatures. To expand its application range, PP requires modification. 2. Applications of Polypropylene (PP) Raw Material ● Main PP plastic products include films, injection-molded items, extruded products, and blow-molded hollow products. ● PP films, categorized by manufacturing method, include blown films (IPP), cast (non-oriented) extruded films (CPP), and biaxially oriented films (BOPP). ● Blown films (IPP): e.g., common round packaging tapes such as everyday plastic bags. ● Cast extruded films (CPP): primarily used in lamination with BOPP for heat-seal packaging—typically serving as the heat-seal layer, e.g., inner layers of biscuit bags. BOPP Performance Overview ● BOPP film offers high transparency, excellent gloss, superior barrier properties, high impact strength, and good low-temperature resistance. Its main drawback is thermal shrinkage during heat sealing (except where intentionally exploited, e.g., in heat-shrinkable cigarette overwrap). Overall, its performance surpasses that of moisture-proof glassine paper, polyethylene (PE) film, and PET film. BOPP film also delivers outstanding printability. Representative physical property data include: haze 85%; tensile strength (MD/TD) > 120/200 MPa; elongation at break (MD/TD) < 180%/65%; elastic modulus 1700–2500 MPa; embrittlement temperature −50°C. ● BOPP film can be laminated with other specialty materials to further enhance or modify its properties. Commonly used materials include PE film, cast polypropylene (CPP) film, polyvinylidene chloride (PVDC), and aluminum foil. ● Among biaxially oriented films, BOPP is the lowest-cost and highest-volume product—highly competitive in the market. 3. BOPP Raw Material Classification and Key Characteristics

Why is BOPP film hailed as the 'Queen of Plastic Films'? What exactly makes it so appealing? What are its primary properties and features?

Pearlescent Film: Typically a 3-layer coextruded oriented film, often featuring a heat-sealable surface layer. Common examples include chopstick pouches, where the pearlescent film itself provides the heat-seal functionality—resulting in a visible heat-seal section. Pearl film density is generally controlled below 0.7, helping reduce costs. Moreover, most pearlescent films exhibit a white, opaque pearlescent appearance offering partial light-blocking capability—thus protecting light-sensitive products. Pearlescent film is also frequently laminated with other films for food and daily-use product packaging, such as ice cream, chocolate packaging, and beverage bottle labels. Features: 1. Usually includes a heat-sealable surface layer; 2. Density typically below 0.7; 3. Exhibits a white, semi-transparent pearlescent appearance; 4. Offers moderate light-blocking capability. Applications: 1. Food packaging; 2. Beverage bottle labels. Metallized Film: A composite flexible packaging material produced by depositing an ultra-thin layer of metallic aluminum onto a plastic film surface using specialized techniques—most commonly vacuum metallization—which imparts a metallic luster. Combining both plastic film and metal characteristics, metallized film is an economical, aesthetically pleasing, high-performance, and highly practical packaging material. It is widely used for packaging dry and puffed foods (e.g., biscuits), as well as outer packaging for pharmaceuticals and cosmetics. Features: 1. Features an ultra-thin aluminum metal layer on the film surface; 2. Exhibits a metallic luster; 3. An economical, attractive, high-performance, and highly practical composite flexible packaging material. Applications: 1. Packaging for dry and puffed foods (e.g., biscuits); 2. Outer packaging for pharmaceuticals and cosmetics. Holographic (Laser) Film: Produced by transferring rainbow-colored, dynamic, three-dimensional holographic images—created using computer dot-matrix laser engraving, true-color 3D holography, and multi-layer/dynamic imaging technologies—onto BOPP film. It exhibits strong resistance to ink erosion, high moisture vapor barrier performance, and enhanced anti-static properties. Domestic production of holographic film remains relatively limited due to its demanding technical requirements. It is mainly applied in high-end anti-counterfeiting and decorative packaging—for example, cigarette, pharmaceutical, and food packaging boxes. Features: 1. Resistant to ink erosion; high moisture vapor barrier performance; 2. Superior anti-static properties. Applications: 1. Anti-counterfeiting packaging for premium goods; 2. Packaging boxes for cigarettes, pharmaceuticals, and food. Advantages: BOPP film is colorless, odorless, and non-toxic, and boasts high tensile strength, impact strength, stiffness, toughness, and excellent transparency. Prior to coating or printing, BOPP film requires corona treatment. After corona treatment, BOPP film demonstrates excellent printability—enabling multi-color registration printing to achieve visually stunning results—and is therefore commonly employed as the outer (print-receptive) layer in laminated films. Disadvantages: BOPP film also has limitations, including a tendency to accumulate static electricity and relatively poor heat-sealing performance. Additionally, while BOPP film’s initiating tear strength improves after orientation, its propagating tear strength remains very low. Therefore, no cuts or nicks should remain along the film edges—otherwise, the film may tear easily during printing or lamination. 1. On standard packaging equipment, static electricity can be rapidly dissipated via conduction through metal components or electrostatic eliminators.

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