Customized packaging for your need.
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Customized packaging for your need.
When we walk into the supermarket shelves, the neatly stacked 10kg rice, 20kg pet food, and even half-person-high milk powder cans always make people curious - what kind of packaging materials can withstand such heavy contents and protect the food's safety? The answer lies in a seemingly ordinary but mysterious materials:kraft paper laminated bags.
Deconstructing the "Thousand Layer Cake":
The Material Code of Kraft Paper Laminated Bags
This packaging is not a simple superposition of single-layer kraft paper, but a "composited armor" created through precision technology. Its core structure usually consists of three layers:
- Outer layer: 80-120 g/㎡ pure wood pulp kraft paper, with natural tear resistance
- Middle layer: 0.02-0.04 mm polyethylene (PE) or polypropylene (PP) barrier film
- Inner layer: food-grade coating or aluminum foil layer
This "sandwich structure" achieves the effect of 1+1>2: kraft paper provides skeleton support, the plastic layer blocks water vapor and oxygen, and the special inner layer meets customized needs such as moisture-proof and light-proof. Just like reinforced concrete in buildings, the advantages of each layer of materials complement each other to create strength that is difficult for a single material to achieve.
Performance map: decoding of the six core advantages
Mechanical miracle
The longitudinally stretched kraft paper fiber has a ductility that is more than 40% higher than that of ordinary paper. A bag filled with 25kg of rice falls from a height of 1.5 meters, and the breakage rate is less than 0.3% thanks to its ability to buffer impact through "elastic deformation".
Environmentally friendly dual-channel
Although it contains plastic components, kraft paper accounts for 60%-80%. Under a professional recycling system, the pulp recovery rate can exceed 95% through hydraulic pulping separation technology. Even if it enters the natural environment, the kraft paper layer can be biodegraded within 3-6 months.
Intelligent protection
By adjusting the microporous structure of the middle layer, the oxygen permeability (OTR) and water vapor permeability (WVTR) of the packaging can be accurately controlled. For example, pet food packaging requires WVTR <10g/㎡·24h, which requires a film layer design accurate to the micron level.
Printing friendliness
The natural light brown background color of kraft paper can reduce the use of ink by 30% compared to pure white materials. Its surface roughness (Ra value 0.8-1.2μm) can ensure printing clarity without causing light pollution.
Warehousing economics
The empty bag can be folded to 1/15 of its original volume, saving 60% of storage space compared to traditional woven bags. The stacking strength after full filling can reach 800N/5cm, which is equivalent to being able to withstand the vertical pressure of 12 layers of similar packaging.
Intelligent upgrade
The latest generation of products begins to integrate intelligent elements such as RFID tag layer and temperature change indicator ink so that bulk packaging can also achieve traceability and quality visualization.
Cross-border application: Guardian from table to field
Dairy field: The specially added aluminum foil layer can block 97% of ultraviolet rays to ensure that the vitamin B2 in milk powder remains stable
Grain storage and transportation: In an environment with a relative humidity of 90%, the moisture content of rice can still be maintained within the safe threshold of 14.5%
New application: The transportation of green coffee beans adopts a "breathing" composited bag, which achieves slow ripening through controllable micro-permeable holes
The future of green evolution
The current packaging industry is exploring more environmentally friendly solutions:
Plant-based plastic layers (such as polylactic acid PLA) replace traditional petroleum-based films
Nanocellulose enhancement technology reduces the weight of kraft paper by 20% without changing its strength
Washable and reusable laminated bags with a life cycle of up to 5 cycles
The next time you open a bag of newly purchased pet food or rice noodles, pay attention to the inconspicuous brown packaging. It is not only the silent guardian of the modern food industry, but also carries the green promise from forest to table. In the pursuit of a balance between convenience and environmental protection, kraft paper laminated bags are writing their own sustainable narrative.
+853-68657023 (Olivia WANG)
