Packaging bag production process and recommended manufacturers, your product needs a packaging upgrade

Undeniably, small packaging bags occupy a very important position in many manufacturing enterprises. Many clothing factories, food factories, garment factories, hardware factories, electronics factories, and cosmetics factories need a large number of exquisite packaging bags. When upgrading product packaging, enterprises want to understand whether the production processes and materials of plastic packaging bags can meet their needs.

Today, Shunxingyuan Packaging, a professional flexible packaging manufacturer, will combine its rich industry experience to prepare a detailed packaging bag production knowledge for you, allowing you to have a smoother journey in ordering packaging bags.

I. Packaging Bag Production Process

1. Production Process Flow

2. Printing

Rotogravure printing: This refers to making the text and patterns on the original into a printing plate, applying ink to the surface of the printing plate, and transferring the graphics and text on the printing plate to the surface of the printed material through pressure to accurately and massively reproduce printed matter identical to the original.

Separate surface printing and inside printing.

3. Lamination

Basic principle of plastic composite flexible packaging: Each material has different advantages and disadvantages. By using a medium (such as glue) to bond two or more layers of materials together, the packaging film and bag achieve better performance. This technology is called "lamination process" in the production process.

4. Curing

The purpose of curing is to accelerate the curing speed of the glue between materials.

5. Slitting

The printed and laminated materials are slit into the specifications required by the customer.

6. Bag Making

The printed, laminated, and slit materials are made into various bags required by customers. Various bag types can be produced: center-seal bags, side-seal bags, stand-up pouches, K-seal bags, R bags, quad-seal bags, zipper bags.

7. Quality Control

Raw material inspection before warehousing

Online product inspection

Printed matter inspection - residual solvent, registration, etc.

Laminated product inspection - lamination strength, bubbles, wrinkles, etc.

Bag making product inspection - sealing strength, dimensional deviation, etc.

Product inspection before shipment

8. Commonly Used Printing Materials

BOPP

Biaxially oriented polypropylene, it is a film formed after biaxial orientation, it does not have heat-sealing properties, and is commonly used as a printing material. Because of its superior moisture-proof properties, it is suitable for surface printing materials for hygroscopic biscuits, dried fruits, puffed foods, melon seeds, etc.

KOP

Coated biaxially oriented polypropylene, a layer of about 1-2um polyvinylidene chloride (PVDC, also known as K coating) is coated on the surface of OPP, so KOP has both the properties of OPP and the advantages of PVDC. Commonly used for mooncakes and other foods that require oxygen and water barriers. KOP has a similar barrier function to aluminum foil, but it is transparent and the contents of the packaging can be seen.

PCO

Biaxially heat-sealable polypropylene film, it has the properties of OPP and the properties of double-sided heat sealing; commonly used for packaging disks and seaweed.

PL

Biaxially heat-sealable pearlescent polypropylene film, it is made from polypropylene resin as the main raw material, with a certain amount of pearlescent powder added, and biaxially oriented. Used for packaging cosmetics, soap, and labels.

PET

Polyester film

Like OPP, it is a secondary biaxially oriented film that is stretched longitudinally and then transversely, or stretched longitudinally and transversely simultaneously, and then heat-set. Commonly used as printing materials for machine packaging rolls, high-temperature cooking bags, zipper bags, etc.

KPET

Chinese name: Coated polyester film, a layer of about 1-2um polyvinylidene chloride (PVDC, also known as K coating) is coated on the surface of PET.

Therefore, KPET has both the properties of PET and the advantages of PVDC. Commonly used for mooncakes and other foods that require oxygen and water barriers. Like KOP, it has a similar barrier function to aluminum foil, but it is transparent and the contents of the packaging can be seen. Its excellent high-temperature resistance makes it more suitable for machine packaging and other bag types that require high high-temperature resistance.

NY

Nylon, used for vacuum packaging, freezing, and high-temperature cooking food packaging; the commonly used thickness is 15um, because it is very thin, it makes a rattling sound when shaken; the density is 1.15g/cm3.

PVC

Polyvinyl chloride, generally used for bottle labels, single-layer material, no lamination is required after printing, PVC glue (alcohol and cyclohexanone in a 1:1 ratio) needs to be used for bonding; commonly used thickness: 40um.

Mat-opp

Biaxially oriented polypropylene matte film, commonly used for packaging puffed foods, mooncakes, paper towels, and cosmetics.

9. Commonly Used Composite Materials

CPP

Unoriented polypropylene, unlike the oriented OPP, CPP is cooled and solidified in its original state after film formation. CPP is the most commonly used heat-sealing material. As a printing material, it is commonly used for packaging paper towels; as a composite material, it is commonly used to be compounded with other materials as a heat-sealing layer.

PET

Unoriented polyethylene, commonly used PE includes IPE, CPE, LLDPE, and ordinary PE. Like CPP, it is the most commonly used heat-sealing material. Used for packaging milk powder, shampoo, washing powder, and other chemical products. In addition to being commonly used as a surface printing material, it can also be used as a composite material. It does not have heat-sealing properties and cannot be placed in the heat-sealing layer. It is generally used as an intermediate composite layer for products, which can increase the stiffness and oxygen barrier properties of the bag.

VMPET

Metallized polyester film, which means a layer of aluminum foil is vacuum-deposited on the PET surface, possessing both PET and aluminum foil properties.

VMCPP

Metallized un-stretched polypropylene, which means a layer of aluminum foil is vacuum-deposited on the CPP surface, possessing both CPP and AL properties.

AL

Aluminum foil has excellent barrier and light-blocking properties. Aluminum foil itself has low strength, no heat-sealability, and is prone to breakage at folds, so it is rarely used alone. It is generally used for products highly sensitive to oxygen and moisture, and for high-grade composite flexible packaging, offering excellent moisture-proof, oxygen-proof, and UV-proof performance.

NY

Nylon, in addition to being commonly used as a surface printing material, can also be used as a composite material. It does not have heat-sealing properties and cannot be placed in the heat-sealing layer. It is generally used as an intermediate composite layer for products, which can increase the sealing strength and puncture resistance of the bag; it is often used as an intermediate layer for bags that require pressure resistance and high-temperature sterilization, such as jelly bags, laundry detergent bags, and chestnut bags. Its oil resistance makes it suitable for packaging meat and other oily products.

II. Recommended Original Manufacturers for Custom Packaging Bags

Dongguan Shunxingyuan Packaging Products Co., Ltd., with 19 years of accumulated experience, specializes in the packaging industry. It is a high-tech enterprise integrating R&D, design, and production. The company is committed to continuously providing innovative plastic bag products for various industries such as apparel, food, chemicals, home gifts, and electronics. It gathers advanced management and manufacturing concepts in the industry, listens to customer needs, provides personalized plastic bag solutions to meet customer demands, and achieves win-win value.

Shunxingyuan highly values independent technology R&D and talent cultivation, equipped with a professional technical R&D center and modern equipment production workshops. It continuously optimizes production processes and strictly implements international quality standard systems.

Shunxingyuan professionally and dedicatedly provides innovative packaging bag products to customers. We start from five dimensions: product, price, printing, efficiency, and service, to provide comprehensive packaging bag solutions to our customers.

In terms of product innovation, Shunxingyuan has successively launched apparel packaging bag series, hardware packaging bag series, and cosmetic packaging bag series to the market, and has applied for multiple invention patents.

In terms of pricing, Shunxingyuan can provide customers with the most comprehensive and reasonable quotes based on different materials and processes.

Regarding printing, Shunxingyuan Packaging adheres to a refined style, with dozens of professional masters with over 20 years of experience performing color matching and printing. Professional quality inspectors check the quality of the printed surface, ensuring every detail of the packaging bag is exquisite and perfect.

In terms of efficiency, Shunxingyuan Packaging is adept at coordinating the supply chain and has complete processes from order intake to finished product shipment, truly achieving high efficiency from raw material supply to finished product delivery, saving customers significant time costs.

Regarding service, Shunxingyuan Packaging is skilled at capturing customer needs. Adhering to the principle of maximizing customer convenience, we strive to save costs in material selection and control every production link, aiming to increase product satisfaction from 99% to 100%.

Thanks to the meticulous creation across these five dimensions, Shunxingyuan has successively gained recognition and cooperation from numerous domestic and international customers. Its clients span many countries globally, and the brands served include ADIDAS, AAPE, IZZUE, I.T, Calvin Klein, LIBERTY, HOME, Tarte, Chick Mark, LEE, etc.

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