Bi-oriented polypropylene film (BOPP) has been used for decades in the flexible packaging industry. It is widely appreciated for its low cost, excellent optical and mechanical characteristics, and its outstanding gas barrier property (particularly to water vapor).
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The film thickness ranges from 15 to 60 micron, and is composed of at least three layers: the middle layer is the thickest and contributes almost exclusively to the mechanical properties; the two outer layers lend various properties to the film (i.e. heat-sealing properties).
Depending on what the final application the film is intended for, additives may be added, in order to fully meet the application requirements.
1. Raw material feeding system
The main raw material, in the central layer, is the isotactic Polypropylene, a semi-crystalline and thermoplastic material. Whereas, for the outer layers, ethylene-propylene and/or ethylene-butane-propylene copolymers are used. These materials are introduced inside the extruders by a hopper system.
2. Extrusion
Inside the extruders, the materials are melted and brought to 200-230°C and then conveyed through the extrusion head, where they emerge in the form of foil.
3. The foil cooling
The foil is then placed in direct contact with a cooled cylinder and immersed in a water bath to quench the melt.
4. Machine direction orientation (MDO)
The film then passes over a series of rollers, which increase the temperature and prearrange it to stretch longitudinally (machine direction). The stretching is achieved by passing the foil between the rollers that run at increasing speeds. As a rule, the foil is stretched up to five times the initial length and, at this stage the polymer chains are aligned. This stage allows the enhancing of the film's mechanical properties, also, the thickness is reduced up to five times.
After stretching, the film is heated once again in order to neutralize the stress accumulated during the stretching (annealing phase).
5. Transverse direction orientation (TDO)
Once out of the longitudinal stretching zone, the film is gripped on both edges by a fast-moving chain of metal jaws (tenter clips). In the tenter, the film goes into an oven, where its temperature rises before being stretched transversely by the diverging rails (i.e. stretching in transverse direction up to 9 times its original width).
At this stage, the macromolecules align, this time in transverse direction, enhancing the film mechanical properties and reducing the thickness up to 9 times. Following the stretching stage, the chain and the film converge , so that the film neutralizes the stress accumulated during the stretching (annealing phase).
6. Thickness measurement and flame treatment
The film reaches a new processing stage where it takes the automatic measurement of the thickness (along the entire width).
Afterwards, one of the faces is subject to the flame or corona treatment to make the film suitable for the following conversion activities, namely, modifying the surface, that is intended to anchor materials such as ink (printing process), adhesive (lamination process), or metal (metallization process).
7. Reel winding
The film is wrapped around a reel and is slit according to the requested dimensions.
What is BOPP plastic film? BOPP film manufacturing process
BOPP plastic film, or Biaxially Oriented Polypropylene film, is a versatile and widely used material in a variety of industries. From food packaging to product labeling, BOPP film is known for its strength, transparency, and durability. In this article, we will examine the concept of BOPP film, its characteristics, and the process of manufacturing.
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BOPP (Biaxially-Oriented Polypropylene) film is a type of plastic film that has a wide range of applications in the packaging, labeling, and laminating industries. It is produced by extruding polypropylene resin into a thin film and then stretching the film in two perpendicular directions, known as biaxial orientation. This process enhances the strength and durability of the film, making it resistant to tearing, puncturing, and other forms of damage.
BOPP Films are the substrate of choice for food packaging all over the world due to the inherent moisture barrier properties, seal ability, high clarity and graphic reproduction, and shelf appeal that they provide, as well as the best possibility of the pack having a monolayer or homogeneous structure.
It is most often used as a co-extruded heat-sealable reverse-printed film for the purpose of food packaging. In the field of labeling, it is favored because of the benefits it offers in terms of yield (the lowest density of 0.55 for the IML orange peel effect), as well as its recyclability with PP containers and other materials. BOPP Films are in high demand all over the world, which is mostly due to the growth of the flexible packaging sector.
BOPP film become a common type of plastic film used in a wide range of packaging, labeling, and laminating applications due to its numerous benefits. The following are some of the key advantages of using BOPP matt film:
Shelf life extension
The BOPP film offers the best moisture barrier of all the regularly used plastic films, and its metalized version offers the best oxygen barrier to the goods. These two characteristics of BOPP films are crucial for food packaging because they increase product shelf life and decrease food waste.
High clarity
BOPP film has excellent transparency, which makes it an ideal material for packaging applications where the visibility of the product is important. This clarity allows customers to see the product clearly, helping to increase sales and improve the overall aesthetic appeal of the packaging.
Product quality
Due to its limited gauge spread, BOPP film offers constant and exceptional seal integrity in addition to its barrier capabilities. The food packaging business also benefits from strong heat seal strength, reduced seal initiation temperature, a wide sealing window, and superior machinability.
Aesthetic/Graphics
Clear BOPP films' excellent transparency makes it possible to provide product packaging with a high degree of visual appeal. In this film, half-tone printing tasks with multicolor printing may be easily completed for high-quality graphics. Excellent gloss, great opacity, and exceptional whiteness in the white opaque film type provide product packaging with an appealing appearance.
The superb metallic look of the metalized film variant makes your goods stand out on the shelf. The ability to do post-lamination procedures like foil stamping, UV spot coating, and embossing to improve the visual appeal of product packaging is made possible by the material's high surface tension.
Versatility
BOPP film can be easily converted into bags, pouches, laminates, and other forms of packaging, which makes it a cost-effective and efficient solution for many packaging needs. Its versatility allows manufacturers to tailor the packaging to the specific needs of their product, whether it be for presentation, protection, or both.
Density
In comparison to all other regularly used flexible packaging films, BOPP films have a special quality. Low density promotes the idea of using less plastic per product by increasing yield during conversion. Low density leads to lighter rolls that are easier to handle since they weigh less per roll than other plastic films of the same length.
Sustainability
Is BOPP film recyclable? In comparison to other plastic film substrates like polyester, BOPP film has a comparatively low carbon footprint. Due to its eco-friendliness in flexible food packaging, BOPP Film is the second most favored substrate after cellulose film. Low melting point materials need less energy to change from one form to another. Reprocessed BOPP resin granules are often used to create injection molded components, furniture such as chairs and tables, and other home products like seat mats.
Cost-effectiveness
BOPP film is an economical choice for packaging and labeling, as it is readily available, easy to convert, and has a low cost per square foot compared to other materials. This cost-effectiveness makes it an attractive option for companies that are looking to reduce costs while still providing quality packaging for their products.
BOPP film is a highly versatile material that has a wide range of applications across many different industries. Some of the key applications of BOPP film include:
BOPP film is widely used in the packaging of food and beverage products due to its high strength and durability, as well as its moisture resistance. BOPP film can be used to create a variety of different types of packaging, including stand-up pouches, vacuum pouches, and side gusseted bags. These types of packaging help to protect food and beverage products from damage during transportation and storage.
BOPP film's high transparency and clarity help this kind of film effective for labeling. Its smooth surface also makes it easy to print on, which allows for the creation of eye-catching and informative labels that can help to build brand recognition and customer loyalty.
BOPP film can be used to laminate a variety of different materials, including paper, cardboard, aluminum foil, and print materials. BOPP film helps enhance the strength and durability of the materials it is laminated to, hence, becoming one of the most suitable choices for applications such as brochures, posters, and other print materials.
BOPP film is used in the production of tamper-evident films, which are used to secure products and prevent unauthorized access. These films are often used in the packaging of products that need to be protected from tampering, such as pharmaceuticals, electronic components, and other similar items. This helps to ensure that the products remain secure and protected, while also providing a measure of consumer protection and confidence.
BOPP film is also used in the packaging of personal care products, such as cosmetics, shampoos, and other similar items. Its high strength, durability, and moisture resistance make it an ideal choice for packaging products that need to be protected from damage and maintain their quality. BOPP film can also be used to create attractive and eye-catching packaging that helps to build brand recognition and customer loyalty.
BOPP film is also used in the packaging of medical products and devices due to its strength, durability, and transparency. BOPP film can be used to create a variety of different types of medical packaging, including bags, pouches, and blister packs. These types of packaging help to protect medical products and devices from damage, while also allowing for easy identification of the contents.
BOPP film is often used to make various types of adhesive tape, including packaging tape and Scotch tape. Its strength and resistance to tearing make it an ideal choice for applications where a strong and reliable tape is required.
BOPP film is used in the production of agricultural films, such as greenhouse covers and mulch films. Its high transparency allows light to penetrate, while its resistance to weathering helps to protect crops from the elements.
In the flexible packaging sector, BOPP (Biaxially-Oriented Polypropylene) film has been utilized for many years. It is well regarded for its affordable price, superior optical and mechanical features, and exceptional gas barrier qualities (particularly water vapor).
Below is a detailed demonstration of the BOPP film manufacturing process:
Isotactic Polypropylene, a semi-crystalline, thermoplastic polymer, serves as the primary raw material in the center layer. While ethylene-propylene copolymers and/or ethylene-butane-propylene copolymers are used for the outer layers. A hopper system is used to introduce these ingredients into the extruders.
The materials are melted and heated to 200&#;230°C within the extruders before being fed into the extrusion head, where they emerge as a foil.
The foil is then brought into direct contact with a cylinder that has been chilled before being submerged in a water bath to cool the melt.
The film is subsequently passed over many rollers, which raise the temperature and prepare the film for longitudinal stretching (machine direction). By moving the foil between the rollers that spin at increasing rates, stretching is accomplished. The polymer chains are aligned at this point after the foil has typically been stretched up to five times its original length. The mechanical qualities of the film may be improved at this step, and the thickness can be cut by up to five times.
The film is heated again after stretching to remove the tension created during stretching (annealing phase).
A quick-moving chain of metal jaws grabs the film on both edges once it exits the longitudinal stretching zone (tenter clips). The film is stretched transversely by the diverging rails after being heated up in an oven in the middle (i.e. stretching in the transverse direction up to 9 times its original width).
The macromolecules align at this point, but this time in a transverse orientation, improving the mechanical characteristics of the film and reducing its thickness by up to 9 times. After stretching, the chain and the film converge, allowing the film to balance off the tension that built up during stretching (annealing phase).
The film enters a new processing step at which point the thickness is automatically measured (along the entire width). After that, one of the faces is given a flame or corona treatment to prepare the film for the subsequent conversion processes, specifically to change the surface that will serve as an anchor for materials like ink (for printing), glue (for laminating), or metal (metallization process).
After being wound around a reel, the film is then sliced to the specific measurements.
The following are the primary metrics that the final product is subject to:
Density, grammage, and thickness
Elastic modulus, elongation at break, and tensile strength
Haze (opacity) and Gloss (sparkling appearance)
The friction coefficient between films and between films and metals
Sealing strength and threshold °C
Temperature stability (heat shrinkage)
The film has at least three layers and a thickness between 15 and 60 microns; the center layer is the thickest and primarily responsible for the mechanical qualities, while the two outer layers provide the film with different characteristics (i.e. heat-sealing properties).
In order to completely fulfill the application criteria, additives may be added, depending on the ultimate application the film is intended for.
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BOPP (Biaxially-Oriented Polypropylene) film is produced from PP (Polypropylene) plastic resins. This type of plastic is harder than PE and is considered to have the general characteristics of good tensile strength, and higher transparency than other kinds of plastic. Besides, BOPP film is also known as a thin film, with a thickness of 10 ~ 40 microns. It is due to the low density of PP particles, only 0.90 g/m3.
Currently, EuroPlas is proud to be the world's No. 1 filler masterbatch manufacturer, proudly bringing customers unique plastic raw material solutions to help their factories optimize production costs and improve the competitiveness on the market. PP filler masterbatch brand EuroPlas is a combination of CaCO3 stone powder, PP base resin, and appropriate additives.
EuroPlas's PP filler masterbatch for BOPP plastic film manufacturing is committed to helping customers:
Optimize production costs
Improve some surface features of finished products: increasing hardness, reducing shrinkage,...
Save fuel thanks to the good thermal conductivity of CaCO3
Reduce mold cooling time, shorten the production cycle
If you are looking for a high-quality PP filler masterbatch for BOPP plastic film manufacturing, do not hesitate to contact us for the earliest advice and support.
BOPP packaging films are made of biaxially oriented polypropylene and they are tough and have high resistance against moisture. These packaging films are widely used in different applications including food packaging, labels, and tape. Thus, by testing the tensile strength of these packaging films is an important part of quality control. Presto is a leading tensile testing manufacturer and designs this quality testing equipment at the best and most affordable prices.
This high-quality lab testing equipment comes with a constant rate of traverse principle that makes it easy for the manufacturers to conduct quality tests on the materials. This high-quality testing equipment has been designed with an upper and lower jaw that will help to evaluate the tensile strength of materials with ease. In this blog, we will discuss brief information about the Presto tensile testing instrument and how this quality testing equipment is useful in testing the tensile strength of materials.
Tension testing is a crucial quality control method employed in the packaging industry, specifically for assessing the mechanical properties of BOPP (Biaxially Oriented Polypropylene) films. It involves subjecting these films to controlled stress conditions to determine their strength, durability, and overall performance characteristics.
By conducting tension tests on BOPP packaging films, manufacturers can effectively measure the film's tensile strength, elongation at break, modulus of elasticity, and other key parameters that directly influence its suitability for various applications.
With Presto tensile strength tester, manufacturers can easily measure the tensile strength of materials and ensure that accurate products will be delivered to the customers.
This testing instrument has been designed as per industry standards including ASTM D429-73, ASTM D624, ATM D638-01, ASTM D76, IS -5-7 and IS . This will ensure accuracy in test results.
Presto tensile testing machine. You can easily read more about the
You can easily conduct quality tests on materials with the help of a. You can easily read more about the top 3 secrets of successfully using tensile testing machines
Now, let us discuss a brief about the Presto tensile strength testing instrument and its high-end features and technical specifications.
The tensile testing or tension testing of the materials is considered to be one of the most fundamental quality tests that help to determine the material&#;s strength and elongation. When a tensile force is applied to a material, it will ultimately break, which allows the manufacturers to get a precise and exact study of its quality. As a result, most manufacturers employ this tensile testing machine in QC laboratories and mainstream production chains to analyze materials' quality.
testing instrument is to examine material tensile characteristics. As a result, you'll be able to conduct a material quality analysis and determine whether or not your product is safe to use. You'll be able to test the tensile strength of materials at various capacities with its large testing range and improved peak load indication for precise reading. Most manufacturers consider using this lab testing equipment because of its wide range of uses. Whenever you conduct the tensile test using a Presto tensile tester, you need to take care of some
The primary goal of this high-quality labis to examine material tensile characteristics. As a result, you'll be able to conduct a material quality analysis and determine whether or not your product is safe to use. You'll be able to test the tensile strength of materials at various capacities with its large testing range and improved peak load indication for precise reading. Most manufacturers consider using this labbecause of its wide range of uses. Whenever you conduct theusing a Presto tensile tester, you need to take care of some precautions to obtain the best quality results
Now, let us discuss a brief information about the features and technical specifications of this quality testing equipment.
Advanced load sensor sensing through advanced electronics.
Highly sensitive load sensor with linearity feature and repeatability
Cross-head travel length: 750mm grip to grip
Single-column rugged structure
Safety limit switches for over-travel safety
Hardened lead screws for frictionless movement
Load cell calibrated by NPL-approved proving ring/dynamometers
High accurate micro-controller system controls
Peak Hold facility available
Bright LED display
Immediate analysis of results after the test with complete accuracy & precision
Feather touch controls
Optional Features:
Specially designed gripper jaws for holding fragile samples.
Other capacity available chart as per requirement.
Wintest one-way communication software.
Graph of Force vs. Elongation
Easy Data management. Users can create product Identification, Sample ID, Shape of Specimen, Company Name, operator details etc.
Auto cut-off facility.
AC Speed drive as an optional accessory (Variable Test Speed)
Motor: ¼ HP Single Phase 220 / 110 V AC Supply
Speed: 100 mm/min and 200 mm/min (Changeable through Belt and pulley mechanism)
Display: Digital (LED)
Accuracy: ± 2% at Full Load (with master load)
Grip to Grip separation: Min 25mm and Max. 700mm
91 or us at
With these high-end features and technical specifications, manufacturers can easily conduct tensile strength tests on the materials. If you want more information about the use of this quality testing equipment like tensile tester price, or want a free sample testing session then you can give us a call at +or us at . Our team of technical experts will consult you regarding all your queries.
Author : -
Gaurav Malhotra
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BOPP is short for &#;Biaxially Oriented Polypropylene&#;. BOPP film is biaxially oriented polypropylene film.
When BOPP film manufacturer produces BOPP films, he will make melt body of high polymer polypropylene into sheet material or thick film firstly through long and narrow handpiece. Then inside a dedicated stretch machine, under certain temperature and set speed, stretch will be proceeded at the same time or step by step in two vertical directions (vertical and horizontal). And after appropriate cooling, heat treatment or special processing (such as electric corona, and depositing), BOPP films are finished.
Common BOPP films include: General biaxially oriented polypropylene film, heat seal biaxially oriented polypropylene film, cigarette packaging film, biaxially oriented polypropylene pearl film, biaxially oriented polypropylene metallized film, matt film, etc.
Advantages
BOPP film is a very important kind of flexible packaging material. BOPP film is colorless, odorless, tasteless, non-toxic and has high tensile strength, impact strength, stiffness, toughness and good transparency.
BOPP film is weak on interface energy, and it needs corona treatment before glueing or printing. After the corona treatment, BOPP film will enjoy excellent printing adaptability. It can be polychrome printed to get exquisite exterior look, which is the reason why BOPP film is often used as surface material of composite film.
Shortages
BOPP film also has some shortages. For example, it is easy to accumulate static electricity and has no heat sealability. On the fast-moving production line, BOPP film is prone to produce static electricity so that there needs to install static remover. In order to obtain heat sealable BOPP film, the BOPP films, after corona treatment, can be coated with heat-seal resin glue, such as PVDC latex, EVA latex or solvent adhesive. Besides, extrusion coating or coextru-lamination methods can be used for manufacturing heat sealable BOPP film. Such films are widely used for packaging of bread, clothes, footwear, as well as cigarettes, book cover packaging. The initiating tearing strength of BOPP film will be increased after the stretch, but the secondary tearing strength is very low. Therefore, any cut cannot be left at both ends of BOPP films face, or at the time of printing or laminating, BOPP film will be easy to tear off. After coating adhesive sticker, BOPP can be used to produce packing tape.
Bopp-film.net and its subsidiary BOPP film manufacturer Guangdong Decro Package Films Co., Ltd., combine to provide more than 20 years of BOPP plastic film production, providing its customer the most advanced range of BOPP products in the WORLD today.
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