What is CPP?

CPP stands for Cast Polypropylene, and offers a range of beneficial properties, making it suitable for various packaging and industrial applications.

CPP film typically has excellent transparency, good flexibility and softness, good moisture resistance, heat sealability, tear-resistance, and chemical resistance.

CPP

Cast Polypropylene

Density

0.9g/cm³

Usage Temperature

0℃~135℃

Common Thickness

20~100um

Propeties

Excellent transparency
Good chemical resitance
Heat sealability

CPP Series

Common CPP

High Barrier CPP

Retort CPP

Mate CPP

Low friction CPP

High friction CPP

MCPP

PP-EVOH

RCPP: ≤135℃

SCPP: ≤121℃

Easy tear SCPP

Matte CPP

What is PP Film

PP film, or polypropylene film, is a thin film primarily composed of polypropylene (PP) as its main raw material.

Polypropylene is a semi-crystalline thermoplastic with the following characteristics:

High density and a high crystalline linear polymer without side chains, making it one of the materials with extremely low density among all resins.
Excellent insulation properties, suitable for applications in the electrical insulation field.
Good chemical stability, except for susceptibility to concentrated sulfuric acid and concentrated nitric acid, remaining relatively stable to most other chemical reagents.
However, low molecular weight alkanes, aromatic hydrocarbons, and chlorinated hydrocarbons can soften or swell polypropylene.
High-temperature resistance, capable of withstanding the impact of both high and low temperatures.
Excellent mechanical properties.

PP film, with its outstanding characteristics, finds applications in various aspects of daily life. These include:

Heat-sealing film for printing and laminate packaging, widely used in the production of bags.
Ultra-thin, highly light-diffusing film for paper-plastic composites used in books, brochures, gift bags, and similar applications.
Release film back-coated with silicone oil, employed for protecting adhesive products such as plasters, labels, silent adhesive tapes, and other back-coated items.
Wrapping and molding protective film for industrial products like fishing rods, golf clubs, and more.
Heat-sealable aluminum-coated film directly applied in the packaging of food items.
Highly transparent film utilized in the production of transparent adhesive tapes and the composite of paper-based products.

The versatility of PP film makes it a crucial material in a wide range of industries, contributing to the enhancement of product performance and packaging solutions.

PP vs CPP vs OPP

PP (Polypropylene), CPP (Cast Polypropylene), and OPP (Oriented Polypropylene) are all types of polypropylene films with distinct characteristics and applications.

Characteristics

Applications

PP

Versatile thermoplastic polymer

High clarity

Excellent tensile strength

Chemical resistance

It is commonly used for packaging, labels, and various applications in both industrial and consumer products.

Commonly used for packaging (such as for snacks, textiles, stationery, and various consumer goods), labels, and various applications in both industrial and consumer products.

CPP

Produced using a cast film extrusion process

Excellent clarity

Seal strength

Flexibility

Higher impact strength compared to other polypropylene films

Used for flexible packaging applications, such as food packaging, overwraps, and adhesive tapes.
Its enhanced flexibility makes it suitable for applications requiring a formable and durable film.

OPP

Produced by stretching polypropylene in both the machine and transverse directions

improved strength

stiffness

clarity

High gloss surface and is resistant to moisture

Widely used in packaging for various products, including snacks, confectionery, and other consumer goods.
Its excellent printability makes it suitable for labels and flexible packaging.

CPP Film Applications

CPP film is produced through the extrusion process of polypropylene (PP) and differs from BOPP (biaxially oriented polypropylene) film.

It belongs to the category of non-oriented films and possesses excellent transparency, high glossiness, good rigidity, effective moisture barrier, outstanding heat resistance, and ease of heat sealing.

Following printing, lamination, and bag making, CPP film finds widespread applications in packaging for food, pharmaceuticals, paper products, clothing, daily necessities, and industrial goods.

Film Type

Characteristics

Materials Structure

Applications

Highly transparent/low-temperature heat-sealing film

Excellent transparency

Low heat-sealing temperature

Fast bag-making speed

BOPP (Printing)/CPP

Jelly and Pudding Packaging Bags

Metalized Material/Film

One side can be coated with aluminum

while the other side exhibits excellent heat-sealing properties

Saves one layer of base material and an additional lamination process when used in aluminum-plastic lamination packaging

Lowers costs

BOPP (Printing)/MCPP

Packaging for expanded food items, cereal bags, etc.

Retort Film

Maintains its shape under high temperature and pressure

Exhibiting elasticity

PET/NY/AL/RCPP

Packaging for sauce, and meat products requiring high-temperature sterilization applications.

Refrigeratable CPP (Retortable Film)

A new type of flexible CPP has been developed that can be used under -18°C refrigeration conditions. (Typically, CPP tends to become brittle at low temperatures, making it unsuitable for frozen packaging)

BOPP/CPP

Packaging for items such as dumplings, and other products that require refrigeration while also demanding transparent visibility.

CPP film is characterized by its exceptional transparency, high glossiness, good rigidity, effective moisture barrier, excellent heat resistance, and easy heat sealing.

Depending on its intended use, it can be classified into general-purpose CPP film, metalized CPP film, and retort-grade CPP film.

After undergoing printing and bag making, CPP film is extensively used in the packaging of clothing, knitwear, floral arrangements, documents, and photo albums, as well as in food packaging for both barrier properties and decorative metallic films.
Moreover, there is a growing demand in various sectors such as food outer packaging, candy packaging (twist films), pharmaceutical packaging (IV bags), adhesive tapes, business card holders, ring binders, and other applications.
CPP film exhibits excellent heat resistance due to the high softening point of PP, which is approximately 140°C. This makes it suitable for applications in hot-fill packaging, retort pouches, and aseptic packaging.
Its resistance to acids, alkalis, and oils further enhances its suitability, making it a preferred material for packaging bread products and laminating materials.
The film is safe for food contact, demonstrating excellent performance without affecting the flavor of the packaged food.
Additionally, different resin grades can be selected to achieve desired properties.