Packaging 6 Key Experiences

Finished Product Barrier Property Verification

Guangzhou Standard

Instrument Name

Package Water Vapor &
Oxygen Transmission Rate Tester

Jointly developed with Guangzhou Standard equipment manufacturer. The instrument presents detection data of package (container) moisture and oxygen permeability more intuitively.

For finished packaged products, barrier performance testing of the packaging container compares OTR and WVTR data before and after filling, ensuring the filling process causes no destructive impact on the packaging.

Seal Integrity and Heat Seal Integrity Verification (Vertical, Horizontal, Pillow-Type Roll Film Automatic Packaging)

Sealing Jaw Type	Heat Seal Strength (N/15mm)
Sealing Jaw Type	1	2	3	4	5	6	7	8
Horizontal Packer Top Seal	20	22	22	23	24	24	22	23
Horizontal Packer Bottom Seal	22	23	24	20	23	24	25	22
Top-Pillow Packer Top Seal	22	24	22	21	27	25	20	25
Top-Pillow Packer Bottom Seal	20	22	26	23	25	22	21	25
Vertical Packer Top Seal	21	20	22	23	24	21	22	22
Vertical Packer Bottom Seal	22	23	24	20	23	24	25	22
Vertical Packer Bottom Seal	23	24	20	21	20	22	22	21
Lab Heat Sealer Flat-to-Flat	25	27	26	27	28	26	25	27

Heat Seal Strength Curve

Under the same PET/VMPET/PE50 structure, comparing the flat-to-flat sealing method of the laboratory heat sealer with the serrated sealing of different roll-film filling machines: the flat-to-flat method produces relatively uniform and higher seal strength, while serrated seals tend to break easily with lower data. The laboratory instrument testing shows notable deviation from actual production.

Seal Integrity and Heat Seal Integrity Verification (Pre-made Pouch / Bag-Feeding Type)

Verification Scope:

Pouch mouth heat seal performance verification;
Packaging container barrier performance verification;

Pre-made Pouch Packer Flat-to-Flat Heat Seal Strength Comparison

Sealing Method	1	2	3	4	5	6	7	8	9	10
Pouch Packer Flat-to-Flat Seal	54	65	58	60	60	68	67	55	50	60
Lab Flat Jaw Bottom Seal	56	53	59	58	55	53	61	59	58	58
Lab Flat Jaw Left Seal	51	59	50	52	59	51	48	52	50	51
Lab Flat Jaw Right Seal	48	43	48	47	49	52	49	48	48	48

With the same BOPP18/VMPET/PE120 structure, comparing the flat-to-flat sealing of the laboratory heat sealer with the flat-to-flat sealing of the pre-made pouch packer, both produce relatively uniform results with minimal data deviation.

Product Shelf Life Verification

Product Shelf Life Verification
Sample Product	Yashuang Packaging Weight Loss & Compatibility Aging Test
Sample Structure	PET12 / Milky PE60
Test Scheme	Conditions
①	Constant Temp (48°C) + Constant Humidity (50%) Oven
②	48°C Constant Temp Drying Oven
③	Room Temperature
Test Duration	28 Days

Weight Loss Percentage Comparison Curve per Stage

	Stage 1	Stage 2	Stage 3	Stage 4
①48°C 50%	0.96%	0.97%	2.05%	0.54%
②48°C	1.94%	2.07%	2.79%	2.22%
③Room Temp	0.12%	0.12%	0.15%	0.11%

① 48°C 50%

② 48°C Dry

③ Room Temperature

Three testing schemes were designed for this sample set (16 pouches in total):

After 28 days of aging, all three compatibility schemes showed weight loss to varying degrees.

Scheme 1: 48°C × 50%H (Samples 1–6), average weight loss 4.42%;
Scheme 2: 48°C × 0%H (Samples 7–12), average weight loss 8.60%;
Scheme 3: Room temperature control (Samples 13–16), average weight loss 0.52%.

Detailed data shall refer to the actual measurements in the report.

Throughout all test schemes, no obvious yellowing appeared on the pouch exteriors; overall appearance remained good.

Polyolefin / Polyethylene Mono-material Packaging Evaluation

No.	Scheme
①	BOPP / VMOPP / PE (VMOPP uses SMZY), dual barrier < 0.15
②	OPP / VMOPP / PE (VMOPP uses SMSU), water barrier 0.05, oxygen barrier < 0.08
③	MDOPE (EVOH) / VMMDOPE / PE, dual barrier < 0.5

The content is sensitive to moisture. The finished product moisture content is 1.8%; when it rises to 2.5%, the taste will be affected.
This test only verifies barrier performance; the effect of oxygen on the content is temporarily not considered.

Scheme Type	48°C 50%	48°C	Room Temp
MDOPE	1.90%	0.19%	0.92%
SMSU	0.58%	-0.01%	0.08%
SMSY	0.56%	0.02%	0.11%
Original	0.00%	-0.02%	0.01%

"Dark Chocolate" Mono-material Aging Verification
Production Order	Material Structure	Barrier
Production Order	Material Structure	Water	Oxygen
052310	OPP / VMOPP (SMZY) / PE	0.059	0.1318
052311	OPP / VMOPP (SMSU) / PE	0.0571	0.1135
052312	MDOPE / VMHCPE / PE	0.5442	0.8984

48°C × 50%H

48°C

Room Temperature

Weight Loss Percentage

Replacing the conventional PET/AL/PE structure with eco-friendly material structures — BOPP/VMOPP/PE and MDOPE(EVOH)/VMMDOPE/PE. Both structures meet customer requirements in terms of structural integrity, barrier performance, and weight loss rate.

Product Simulated Transport Case Study

①	Pre-test inspection: all packaging pouches were intact with no air leakage.
②	Simulated transport was performed at a speed of 150 for 60 minutes. Upon inspection, no leakage or damage was observed on the inner packages.
③	After three bottom-face drops from 1.5 m, the carton showed deformation and minor damage around the bottom edges; after three side drops, the carton cracked with obvious damage. However, the inner packages remained intact with no leakage.

The simulated transport testing process combines the requirements of the packaged product with transport compatibility, enabling matching tests to be conducted under realistic conditions.

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