Characteristics and Functions of Plastic Packaging Bags

Dear valued merchants,

We sincerely recommend to you a distinctive packaging product - a series of plastic packaging bags which can be handled in a plastic bag packing machine. These plastic packaging bags boast superior transparency, excellent resistance to high and low temperatures, outstanding physical structural strength, and excellent ecological isolation properties. They provide superb sealing effectiveness and radiation resistance. Moreover, this product combines good ease of handling with convenient product display capabilities. Let's appreciate this detailed product introduction together and experience the unique charm of this product.

Product Overview:

Plastic packaging bags are an ideal choice for providing optimal protection to various types of items. With their multiple excellent characteristics, plastic packaging bags successfully integrate transparency, heat stability, physical strength, biological isolation, sealing effectiveness, radiation resistance, ease of handling, as well as promotional, protective, and practical properties. Whether it's food, beverages, pharmaceuticals, or medical devices, a wide range of substances can receive the highest quality protection under the care of plastic packaging bags. Particularly noteworthy is the sealing effectiveness of plastic packaging bags, which ensures that these products are fully protected during storage and transportation, thereby guaranteeing product quality and integrity.

Product categories include:

1. PE (Polyethylene) Film: PE film is the earliest and widely used plastic flexible packaging bag in China. It features low cost, excellent waterproofing properties, but slightly inadequate gas barrier properties. Common PE film products include moisture-proof film, cling film, self-adhesive film, stretch film, shrink packaging film, etc.
2. PP (Polypropylene) Film: PP film mainly includes CPP (Cast Polypropylene) and BOPP (Biaxially Oriented Polypropylene) types. CPP film is often used as the heat sealing layer in composite materials and can be categorized into ordinary, cooking-grade, and aluminum-plated grades based on performance and usage; BOPP film is divided into ordinary, pearlized, and matt varieties.
3. PET (Polyethylene Terephthalate) Film: PET film is made from polyethylene terephthalate through extrusion into thick sheets and then biaxially stretched to form thin film material. It possesses excellent mechanical properties with high rigidity, hardness, and toughness, puncture resistance, abrasion resistance, heat resistance, low-temperature resistance, chemical resistance, oil resistance, gas tightness, and aroma retention. PET film is commonly used as one of the substrates for barrier composite films.
4. BOPA (Nylon) Film: BOPA (Nylon) film has excellent toughness, superior tensile strength, tear resistance, impact resistance, and puncture strength, but it lacks heat sealing properties. It has excellent barrier properties against gases, oxygen, and aroma, is resistant to chemicals except strong acids, and has excellent oil resistance. However, due to its high moisture absorption, it may expand, wrinkle, elongate laterally, and shrink longitudinally, with a maximum elongation rate of up to 1%.
5. PVDC (Polyvinylidene Chloride) Film: PVDC film is a high-barrier film coated with polyvinylidene chloride, exhibiting extremely high barrier properties suitable for packaging materials with stringent gas barrier requirements.
6. EVOH (Ethylene Vinyl Alcohol Copolymer) Film: EVOH is a crystalline polymer with a chain-like structure, serving as a new type of high-barrier material. Its barrier properties decrease significantly when exposed to moisture, so it is typically used between two layers of materials with good moisture resistance.
7. Aluminum Coated Film: Aluminum-coated film typically uses CPP, PET, or BOPP as the substrate and is prepared by vapor deposition. The aluminum layer is extremely thin, giving the material a metallic luster and greatly enhancing its barrier properties.
8. PVA (Polyvinyl Alcohol) Film: PVA film features high barrier properties, resistance to dissolution, oxygen barrier, corrosion resistance, freshness preservation, aroma retention, color preservation, oil and chemical resistance, etc. It is widely used as a barrier layer in co-extruded films, especially suitable for food and pharmaceutical packaging. Additionally, water-soluble films are often used for packaging certain special chemical drugs.

The product features include:

1. Excellent Transparency: Plastic packaging bags are made of high-quality materials, featuring extremely high transparency. They clearly display the appearance and characteristics of the contents, enhancing consumer awareness and trust in the product.
2. Outstanding Heat and Cold Resistance: Plastic packaging bags can adapt to a wide range of temperatures. Whether in high-temperature or low-temperature environments, they maintain stable performance, ensuring that the contents are not affected by external factors.
3. Excellent Physical Structural Strength: Plastic packaging bags have strong physical structural strength, capable of withstanding significant pressure and impact, effectively preventing damage or leakage of the contents.
4. Outstanding Ecological Isolation Properties: Plastic packaging bags have good ecological isolation properties, effectively preventing harmful substances such as oxygen, water vapor, and bacteria from entering the contents, ensuring the safety and hygiene of the contents.
5. Excellent Sealing Effect: Plastic packaging bags have excellent sealing effects, effectively preventing the contents from being contaminated or corroded by the external environment, ensuring product quality.
6. Radiation Resistance: Plastic packaging bags can resist interference from radiation such as ultraviolet rays and electromagnetic waves, ensuring that the contents are not damaged by radiation.
7. Ease of Handling: Plastic packaging bags have good ease of handling, easy to clean and disinfect, reusable, reducing resource waste, and meeting environmental requirements.
8. Convenient Product Display Performance: Plastic packaging bags have good product display performance, clearly presenting the appearance and characteristics of the contents, attracting consumer attention, and enhancing the product's market competitiveness.
   

The characteristics of plastic film include:

• Environmental Friendliness: Compared to traditional packaging materials, the production process of plastic film has a smaller environmental impact, generating less waste and contributing to environmental protection.
• Flexibility: Plastic film possesses high plasticity, allowing it to be processed into various shapes and sizes as needed, meeting the packaging requirements of different products.
• Waterproofing: Plastic film exhibits excellent waterproofing properties, effectively preventing products from being damaged by rainwater or other liquids during transportation or storage.
• Barrier Properties: Plastic film has high barrier properties, effectively preventing the permeation of oxygen, water vapor, odors, and other substances, ensuring the quality and shelf life of products.

Target Audience

Plastic packaging bags are suitable for businesses in various industries, including food, beverages, pharmaceuticals, medical equipment, and more. Whether you're a large enterprise or a small shop, plastic packaging bags can meet your needs, providing comprehensive protection and display for your products.

With their outstanding performance and multiple excellent characteristics, plastic packaging bags have become the preferred packaging product for many businesses. They not only provide comprehensive protection for your products but also attract consumers' attention through clear display, enhancing the competitiveness of your products in the market. We believe that plastic packaging bags will be an effective assistant for your business success!

In today's fiercely competitive business environment, excellent packaging design plays a crucial role in product sales. Therefore, understanding these classification knowledge is essential for selecting suitable packaging materials. This article will delve into different types of plastic packaging bags and their applications, providing you with more comprehensive reference information.

Firstly, let's understand high-density polyethylene (HDPE) plastic bags. These bags are commonly used for packaging food and fiber products such as pastries, candies, snacks, powdered milk, salt, tea, as well as shirts, clothing, needle cotton products, and synthetic fiber products. They have good heat resistance and moisture resistance, effectively protecting the products from environmental influences.

Secondly, low-density polyethylene (LDPE) plastic bags are widely used in fields such as garbage bags, spawn bags, convenience bags, shopping bags, tote bags, vest bags, fresh-keeping bags, and inner bags of woven bags. They have moderate softness, are easy to fold and carry, and also have high strength and toughness, able to withstand certain pressure and impact.

Next, let's introduce polypropylene (PP) plastic bags. These bags are suitable for packaging textiles, needle cotton products, clothing, shirts, etc. They have excellent compression resistance and abrasion resistance, effectively preventing products from being crushed and worn. Additionally, PP plastic bags have good transparency and gloss, enhancing the aesthetics of the products.

Lastly, let's mention polyvinyl chloride (PVC) plastic bags. These bags are commonly used in fields such as gift bags, luggage bags, cosmetics packaging bags, zipper file bags, data bags, etc. They have excellent barrier properties and waterproofness, effectively maintaining the freshness and hygiene of the products. Moreover, PVC plastic bags have good printing effects, meeting various personalized needs.

Different types of plastic packaging bags have their own characteristics and are suitable for different products and occasions. When selecting packaging materials, businesses should consider their own needs and actual situations comprehensively to choose the most suitable packaging bags, thereby enhancing the competitiveness and added value of the products.

Plastic packaging bags, with their diverse styles, bright colors, and excellent quality, have become indispensable packaging products in the modern market. Here, we elaborate on how to choose plastic packaging bags that suit the temperament of your products and explain the many advantages brought by this packaging technology.

Recommendations for Choosing Plastic Packaging Bags

Amidst the myriad packaging materials available on the market, plastic packaging bags stand out for their unique soft touch and excellent protective performance. How do you choose the right plastic packaging bags for different types of products? Here are a few suggestions for your reference:

1. Choose Appropriate Material Based on Product Nature: Plastic packaging bags come in various materials such as polyethylene (PE), polypropylene (PP), nylon (PA), and more. Each material has its unique characteristics and application range. For example, PE plastic packaging bags have good low-temperature resistance, suitable for frozen foods, while PP plastic packaging bags have higher strength and toughness, ideal for packaging heavy items.
2. Consider the Size and Shape of the Packaging Bags: The size and shape of plastic packaging bags can be customized according to the size and shape of the products. For example, for large-volume items, rectangular or square-shaped packaging bags can be chosen, while flat-shaped packaging bags are suitable for slender items.
3. Emphasize on the Appearance Design of the Packaging Bags: Plastic packaging bags not only serve the function of protecting products but also enhance the added value of products through attractive appearance design. Therefore, when choosing packaging bags, it's important to consider whether the colors, patterns, fonts, and other elements of the packaging bags match the brand image of the products.

Manufacturing Process and Advantages of Plastic Packaging Bags

The manufacturing process of plastic packaging bags mainly involves the following steps: Firstly, designing the pattern and text of the packaging bags according to customer requirements; then, using computer-controlled printing machines to print the pattern and text onto plastic film; next, cutting the printed film into the required shapes; finally, heat-sealing the cut film to form complete packaging bags.

Compared to traditional packaging materials such as metal, ceramic, and glass, plastic packaging bags have the following significant advantages:

1. Lightweight and Convenient: Plastic packaging bags are lightweight, making them easy to carry and transport, effectively reducing logistics costs.
2. Excellent Protective Performance: Plastic packaging bags have good waterproof, dustproof, and oil-resistant properties, effectively protecting goods from the influence of external environments.
3. Easy to Process and Shape: Plastic packaging bags can be processed through various mechanical operations such as cutting, sewing, and heat sealing, making it convenient and fast.
4. Affordable Price: The production cost of plastic packaging bags is relatively low, providing businesses with more economical packaging solutions.
   

Plastic packaging bags, with their rich variety of styles, vibrant colors, and high quality, have become indispensable packaging products in the modern market. We believe that by selecting and using plastic packaging bags wisely, your products will stand out in the fierce market competition and win the favor of consumers.

Plastic film, as the name suggests, is a thin material made from various polymer compounds. It is widely used in modern packaging fields for the protection and extended shelf life of products such as food, beverages, and daily necessities.

Manufacturing Technology and Supporting Equipment for Plastic Bags

We will conduct an in-depth analysis and examination of the entire production process and relevant technical methods, providing you with comprehensive and three-dimensional reference information.

Firstly, our primary raw material is polyethylene (PE), which undergoes stringent selection and testing to ensure that each piece of plastic film possesses excellent quality and stability. During the production process, we choose suitable production methods based on different requirements and applications, such as extrusion blow molding, T-die method, biaxial stretching, calendering, and extrusion coating. Among these methods, extrusion blow molding and extrusion coating are the two most commonly adopted techniques, thus categorizing plastic films into blown films and cast films.

In the preparation process of blown films, we first heat the resin to a molten state, then extrude and inflate it through a circular die head, and after cooling, we obtain blown films. These films have unique characteristics where, under the effect of inflation and traction, a small amount of molecules undergo directional alignment, resulting in significantly higher tensile strength compared to cast films.

As for cast films, the resin is heated to a molten state, extruded into a film through a T-die, then cooled on cooling rollers, and finally peeled off from the rollers. These films also have distinctions between stretched and unstretched.

After completing the film preparation, we print patterns clearly on the plastic films using advanced color printers according to customer design requirements. Subsequently, we employ various composite technologies to cleverly combine various packaging materials into a multi-layered structure. These composite technologies include but are not limited to dry lamination, wet lamination, extrusion lamination, solventless lamination, co-extrusion lamination, coating lamination, and thermal compression lamination.

Here, we will briefly introduce several common composite methods. Dry lamination involves uniformly applying adhesive (glue) to one plastic film, evaporating excess solvent through a drying oven, then pressing it with another plastic film using heated rollers to form a composite film. Wet lamination involves coating the surface of aluminum foil, plastic film, or paper with a water-soluble adhesive, laminating it with another substrate such as paper or glassine paper while the adhesive is not completely cured, then drying it through a hot air drying oven to obtain a composite film. Solventless lamination uses solvent-free adhesive to tightly bond two substrates together.

Additionally, there is extrusion coating technology, usually employing PE as the adhesive. After extruding through a T-die, it forms a molten film. When the adhesive is in a molten state, it bonds two substrates together, and after cooling and setting, a composite film is obtained.

After completing the composite process, we use a slitting machine to accurately cut the wide raw material films into standard specifications for plastic bags. Finally, we use a three-side sealing machine, employing ultrasonic high-frequency welding or heat-sealing blades, to produce bags with three sealed sides and one open side.

This concludes our detailed introduction to plastic bag manufacturing technology and supporting equipment. We understand that only through continuous innovation and pursuit of excellence can we meet the growing needs of our valued business partners.