
A liquid bag is a plastic bag used to package liquid products, usually
composed of the following parts:
Outer layer material: The outer layer of the liquid bag is usually made of
high barrier materials to prevent internal liquid from coming into contact with
the external environment. Common high barrier materials include polyvinylidene
chloride (PVDC), polyvinyl alcohol (PVA), etc. These materials have excellent
moisture-proof, oxygen resistant, and odor resistant properties, ensuring
long-term storage of internal liquids.
Inner layer material: The inner layer of the liquid bag is usually made of
food grade plastic to ensure that the internal liquid does not react chemically
with the plastic material, and is easy to clean and disinfect. Common food grade
plastics include polyethylene (PE), polypropylene (PP), etc.
Sealing material: The sealing of liquid bags is usually made of heat sealing
material to achieve a sealing effect. The heat sealing material can be tightly
combined with the outer and inner layer materials to ensure that the liquid bag
does not leak before opening.
Printing and decoration: In order to improve product aesthetics and brand
image, liquid bags are usually printed and decorated. Printing and decorative
materials must comply with food safety standards, must not react chemically with
internal liquids, and must also be easy to clean and disinfect.
Production process: The production process of liquid bags usually includes
processes such as bag making, printing, and heat sealing. During the production
process, it is necessary to strictly control parameters such as temperature,
pressure, and time to ensure that the produced liquid bags have excellent
sealing and durability.
In summary, the composition of liquid bags includes outer layer materials,
inner layer materials, sealing materials, printing and decoration, as well as
production processes. These components work together to ensure that the liquid
bag has excellent moisture resistance, oxygen resistance, odor resistance,
sealing performance, durability, and also meets food safety standards.
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