Case Studies
Real needs, real parameters, real feedback — liquid flexible packaging solutions QC Packaging has run together with customers
Passion Fruit Juice: From Tin Cans and Double Sterilisation to a 220L Aseptic Bag in Drum
Passion fruit juice is intensely aromatic and strongly acidic, which makes it an excellent base for blended drinks — and a demanding product to pack. The traditional route is pasteurisation into tin cans followed by a second, in-container sterilisation: long heat exposure costs aroma and vitamins, and the juice's acidity slowly attacks the can's internal lacquer, holding shelf life to a few months. Moving to aseptic bag-in-drum packaging changes the balance: UHT sterilisation takes seconds, no second sterilisation is needed, the product stores at ambient temperature and shelf life reaches around a year. QC Packaging supplies 5L–220L aseptic bags, high barrier films and matching fitments and filling support for juice producers — with sterilisation method, packaging format and filling line specified together.
Passion fruit juice and concentrate — high acidity, aroma-sensitive, oxidation-prone
View Case →10L Retort Pouches for Juice: From a “Metallised Bag” Brief to a Validated 121°C Process
A juice producer needed 10L packaging for a product requiring post-fill retort sterilisation at 121°C, and the initial brief was for a conventional metallised bag with a butterfly valve. A conventional metallised structure cannot withstand 121°C. QC Packaging re-matched the film structure to the customer's sterilisation process, moved to a high-temperature retort pouch with pure aluminium foil plus a high-temperature cap and sealing structure, and after two rounds of sampling the customer's 121°C retort test passed. Pricing and quantity were then confirmed.
Juice (10L, high-temperature retort sterilisation at 121°C)
View Case →Short Soy Milk Shelf Life: Diagnose the Process Before Changing the Bag
A plant-based beverage producer in Northeast China wanted longer shelf life for its bagged soy milk, and its first instinct was a better bag. QC Packaging did something else first: it broke shortened shelf life into verifiable parts. The finding was that the bottleneck is the sterilisation process and spore-forming bacteria, not the bag itself — followed by a material route that solves the process first and raises the barrier only as needed.
Soy milk (plant-based beverage)
View Case →Bagged Water Film Supply: From a First Trial Order to Monthly Reorders
A drinking water company moved into bagged water. With the filling line in place, what it needed most was film supply that could keep pace with production. QC Packaging started from a first trial order, ran roll film by the kilogram and finished bags by the piece in parallel, and turned stable batch quality into steadily tightening reorder cycles — once a line runs, film is daily bread: one day without supply is one day of downtime.
Drinking water (5L-15L bagged water)
View Case →Protein Powder Three-Side Seal Bags: Multi-Round Sampling to Reach the Customer Validation Line
A protein-based nutritional powder producer needed three-side seal bags with a real moisture barrier. After early samples were sent back by the customer technical team, QC Packaging treated each rejection as an improvement note - and kept refining until the bag reached the validation line.
Protein-based nutritional powder (moisture-sensitive)
View Case →Liquid Fertilizer Drum-Liner Bags Keep Leaking? The Problem May Be in the Film
A fertilizer producer in East China kept suffering from leaking drum-liner bags - hot filling at 50-60℃ was too much for ordinary PE film. QC Packaging rematched the film to the fertilizer's properties and filling conditions, solving the leaking problem at the source; the customer has moved into steady repeat orders.
Liquid fertilizer (10kg/drum, drum-liner hot filling at 50-60℃)
View Case →Sesame Paste & Sesame Oil Aseptic Bags: A Full-Range 2.5L-20L Solution
A condiment producer needed the full packaging range for sesame paste and sesame oil - 2.5L/5L/10L/20L aseptic bags in one package, from bags to equipment.
Sesame paste (high viscosity, high oil content) + sesame oil (oil-based), 2.5L-20L aseptic bags
View Case →Tomato Paste 220L Aseptic Bags: High-Acid, High-Viscosity Sauce Solution
Four operating plants in Xinjiang's tomato paste region collectively inquired about 220L aseptic bags - packaging that must handle high acidity, high viscosity and oxygen sensitivity all at once.
Tomato paste / ketchup (high acidity pH ~4.0-4.5, high viscosity 28-38 Brix), 220L aseptic bags
View Case →Wine OTR Test: Letting Data Drive Bag Selection
A customer was unsure about oxygen permeability of flexible packaging — we measured their current bag's OTR and let the data drive the selection.
Wine (2.5L metallized bag with butterfly valve)
View Case →Birch Sap Full-Chain Traceability: Packaging Starting at Collection
A producer filling 25L + 1T aseptic bags, facing industry-wide traceability requirements — we built the packaging chain starting from the collection end.
Birch sap (collection bags + aseptic bag finished filling)
View Case →NFC Mango Juice Export: 12 Months Without Browning
An export customer using 30,000 x 5L BIB bags + 500 x 220L aseptic bags per month achieved 12 months without browning using our high-barrier film.
NFC mango juice (high VC, highly oxygen-sensitive)
View Case →Liquid Fertilizer: From Drum to Bag — Matching Volume, Gas and Bag Size
A customer producing hundreds of tons per year switched from 20kg drums to BIB bags. We recalculated the bag size based on density and fitted a vented cap — customer feedback: "no swelling, no leakage."
Microbial inoculant + amino acid water-soluble fertilizer (density 1.5, gas-producing)
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