About Us
Founded in 1993, Yuyang Packaging & Printing Co., Ltd. is located in Wuhan Economic and Technological Development Zone, the central hub of China. Over the past 30 years, we have grown into a modern enterprise specializing in the research, design, and manufacturing of flexible plastic packaging, integrating advanced technology and innovation to deliver high-quality solutions.
Service Pinpline
From raw material inspection to final shipment, every step of our flexible packaging production is strictly controlled through in-process and final quality inspections to ensure stable quality, safety, and consistency.
Design & Requirment Confirmation
Raw Material Procurement & Incoming Inspection (IQC)
Printing
Before production begins, detailed specifications are confirmed, including:
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Bag type (stand-up pouch, three-side seal, four-side seal, flat pouch, etc.)
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Dimensions and thickness
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Material structure (e.g. PET/PE, BOPP/CPP, PET/AL/PE)
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Zippers, tear notches, windows, spouts
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Application (food, frozen food, coffee, daily chemicals, etc.)
Quality checks include:
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Film thickness consistency
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Visual appearance (impurities, gel spots)
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Tensile strength
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Food-grade compliance documentation (if required)
Only materials that pass Incoming Quality Control (IQC) are approved for production.
Printing transfers the design, text, and branding onto the plastic film.
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In-process quality checks (IPQC):
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Color accuracy and consistency
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Registration alignment
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Missing print or contamination
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Ink adhesion (tape test)
Lamination
Curing
Multiple film layers are bonded together using adhesive to achieve different functions
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Quality control focuses on:
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Lamination uniformity
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Absence of bubbles or wrinkles
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Bonding (peel) strength
This step directly affects barrier performance, durability, and product safety.
After lamination, the film is stored for 24–72 hours or longer to allow the adhesive to fully cure.
Purpose of curing:
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Complete chemical reaction of adhesive
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Structural stabilization
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Prevention of delamination during use
Skipping or shortening this step may cause quality issues and is often avoided in well-established factories.
Slitting
Large laminated rolls are slit into smaller rolls suitable for bag-making machines.
Quality checks include:
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Accurate width control
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Clean and even edges
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No edge damage or burrs
Bag Making
Final Quality Inspection (FQC / OQC)
Packing & Pre-Shipment Check
This is the stage where the film is converted into finished bags through:
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Heat sealing
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Forming
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Hole punching
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Zipper or tear-notch installation
Key quality inspections:
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Seal strength and integrity
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Leakage resistance
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Dimensional accuracy
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Zipper functionality and smoothness
Before shipment, finished products undergo final inspection, including:
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Visual appearance (stains, creases, scratches)
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Size and thickness
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Seal strength
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Quantity verification
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Special customer requirements (odor, hand feel, etc.)
Inspection is performed according to internal standards or customer-specified sampling plans.
Before delivery:
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Products are packed according to specifications
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Carton labels are verified
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Moisture-proof and protective packing is applied
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Pre-shipment inspection is conducted
Production samples are retained for traceability in case of future quality inquiries.
Quality Inspection
To ensure consistent product quality and performance, our factory is equipped with a comprehensive set of quality inspection and testing instruments. These tools support quality control at different production stages, from incoming raw materials to in-process inspection and final product verification.
01
Automatic Printing Quality Inspection Systems - 2 Units
We are equipped with two automatic printing inspection systems to evaluate print accuracy, color consistency, and registration during production, reducing human error and improving overall print stability.
02
Color Difference Analyzer (Spectrophotometer) - 3 units
Our quality control department is equipped with three color difference analyzers (spectrophotometers), which are used to measure and control color consistency during printing. This ensures that printed colors remain accurate and stable across different production batches.
03
Coefficient of Friction Tester (COF Tester) - 1 unit
Our testing capability includes one coefficient of friction (COF) tester, which is used to evaluate the surface friction properties of packaging films. This ensures proper machinability, stackability, and handling performance during filling and transportation.
04
Tensile Strength Tester × 2 units
Our quality inspection facilities include two tensile strength testers, which are used to evaluate the mechanical strength of packaging materials, including film tensile strength, elongation, and sealing strength performance.
05
Heat Seal Tester × 1 unit
Our testing equipment includes one heat seal tester, which is used to evaluate sealing strength and optimal sealing conditions of packaging films, ensuring reliable seal integrity for stand-up zipper pouches.
06
Negative Pressure Vacuum Leak Tester × 1 unit
Our quality inspection equipment includes one negative pressure vacuum leak tester, which is used to detect seal integrity and micro-leakage of finished pouches under vacuum conditions.
07
Coulometric Oxygen Transmission Rate (OTR) Tester × 1 unit
Our laboratory is equipped with one coulometric oxygen transmission rate (OTR) tester, which is used to evaluate the oxygen barrier performance of packaging materials and laminated structures.
08
Horizontal High-Pressure Retort × 1 unit
Our testing facilities include one horizontal high-pressure retort, which is used to simulate sterilization conditions and evaluate the heat resistance and structural stability of packaging materials.
09
Constant Temperature Drying Oven × 1 unit
Our testing facilities include one constant temperature drying oven, which is used to provide controlled thermal conditions for material conditioning, drying, and stability testing.