Plastic package material with high performance and versatility

1. High permeability plastic packaging materials High-impedance and permeable plastic packaging materials With the rapid development of the food industry in the past more than a decade. Ask for quality, freshness, flavor and

The high-impermeability packaging materials and barriers that extend shelf life have gained rapid development in the packaging industry, especially in the food packaging industry.

And widely used.
High-resistance plastic packaging materials generally refer to materials that have a high damping effect on gas-liquid permeate, that is, prevent the intrusion of oxygen to prevent the oxidation of products.

Quality, prevent the penetration of water or water vapor to prevent the product from moisture and mildew, prevent the aroma, fragrance and carbon dioxide escape, so as to avoid the taste and deterioration of the product.

Wait.
In practice, it is required to have both excellent gas barrier performance and good waterproof performance. Single and single layer materials are difficult to achieve.

Therefore, in recent years, multiple composite, multi-layer composite, blending, alloying, vacuum evaporation, plasma technology and high permeability polymer development

For speedy.
Looking forward to the early 21st century, high-impermeability packaging materials such as ethylene vinyl acetate copolymer (EVOH), polyvinylidene chloride (PVDC), polypropylene

Polynitrile (PAN), Polyamide (PA), Polyethylene terephthalate (PET) multilayer composites and silicon oxide evaporated films

It will be further developed, with the following products being even more eye-catching.
(1) High-impervious polyamide packaging material: and SELARPA, MXD6 is a semi-coalescing of meta-dimethyl diamine and oxalic acid polycondensation

Crystal polyamines with excellent gas barrier properties (Oxygen permeability 0.03ce·20um/m2·d·atm), Polyamide 6 and 66, respectively

10 times and 20 times, puncture resistance, transparency, heat resistance, and environmental adaptability; Coextruded multi-layer extension film or blend with polyamide 6 (PA6)

Extended film can be used for packaging of meat, fruit, retort pouch and cheese; SELRPA is made of hexamethylene diamine and isophthalic acid.

Amorphous polyamides have the advantage that their gas barrier properties greatly exceed that of polyamide 6 under high humidity conditions, and their moisture permeability is very low.

The fried crispy snack food has a heat distortion temperature of 127°C and is also suitable as a packaging material in hot filling and cooking sterilization operations.
(2) Orientated super-osmotic and oriented high barrier films, which are derived from the co-extrusion of OXyshield PA and EVOH, are characterized by high relative

Excellent oxygen barrier performance under humidity conditions (at 23°C, 65RH%, oxygen permeability 0.2CC/645cm 2d, and at 93RH%, its

Oxygen permeability 0.4CC/645cm2/d) can replace aluminum foil and BOEVOH and PVDC coating PET film for cigarettes, food packaging and soft cover materials

.
(3) The modified polyester SELRARP packaging material has the advantages of not only having all the physical properties of polyester, but also the barrier properties of oxygen and aromas.

And it has strong toughness, solvent resistance and moisture resistance. Its solvent resistance to olefins is 100 times greater than that of HDPE, making it particularly suitable for packaging automotive applications.

Protective products, coatings, adhesives and other industrial uses.
(4) Poly(ethylene terephthalate) PEN, which is a polyester obtained by replacing a benzene ring in PET with a naphthalene ring, and its mechanical properties such as breakage

The strength, elastic modulus, elongation, and acid resistance, alkali resistance, and other chemical properties are all superior to those of PET, which is beneficial to the thinning of bottles.

And its heat-resistance is higher than that of PET. PEN bottle can be washed with alkaline liquor at 85°C like glass bottle, so it is chased for repeated use of mineral water bottle and beer.

bottle. PEN gas barrier.
It is also a good one among various resins, so it is attractive for use as a barrier material for impregnation. Especially PEN and PET blends or coextrusion containers,

It not only improves the heat resistance of PET, but also improves the gas barrier properties. It is suitable for the manufacture of wide-mouth containers for foods, cosmetic bottles, and heat-resistant bottles.
(5) silicon oxide Xu Fu film (also known as soft glass)
One of the focuses of packaging materials innovation is to improve the barrier performance of packaging, and at the same time reduce the amount of material and facilitate recycling. Among them, the coating of silicon oxide is the most highly regarded material for high permeability, Japan. ,nice

The country and Western Europe are developing very rapidly. The coating materials used in this product mainly include silicon oxide, silicon dioxide, organic silicon oxide (HMDS), and silicon.

Alkane (SIH4) and so on. Coating techniques include physical vapor deposition (PVD), vacuum evaporation, electron beam evaporation, chemical vapor deposition (CVD): high-frequency/

Low-temperature plasma, electromagnetic waves, and PVD and CVD co-evaporation technologies.
Film substrates include PE, PP, PS, PET, PA, PVDC and PC films and stretch films. Silicon oxide coated film is characterized by resistance

The permeability is very good, the coating is very thin, only 40 to 100 nanometers, but it can play the role of impermeability of the glass layer, and maintain a high degree of resistance to fracture, easy

For recycling, environmental protection is good.
Widely used in food, liquid or high moisture food, medical infusions, cosmetics, detergents, chemical agents and industrial supplies.

Confectionery and pharmaceutical heat or cold seal packaging; various foods with soft covers and toothpaste, spices, medicines and a variety of chemical and industrial products

Composite hoses, especially silica-coated PET films, will be more widely used in cooking bags and microwave ovens due to their high heat resistance

The pan application, which coats bottles and containers, can replace glass bottles, reduce weight, and reduce breakage.
In recent years, Japan has developed a two-layer evaporation technique of low-temperature plasma ionization of organic silicon oxides and silicon dioxide, which vaporizes thin films for oxygen and water vaporization.

The impermeability of steam is more than 3 times higher than that of monolayers. Another barrier-free, colorless, transparent silicone coated film has also been developed and used as a barrier layer.

The multi-layer composite film has a significantly better barrier performance than other barrier films.

Comparison of Impermeability of Several High Impedance Films

Film Name Gas Transmission Rate Water Vapor Transmission Rate (25°C, 100% RH, CC/m2·d·atm) (40°C, 90% RH, g/m2·d)
PVDC coating, PET film 2～8 2～10
EVOH film 1 to 3 30 to 100
PVA film 14 1100
Aluminum evaporated PET film 0.3 to 1.0 1.0 to 1.5
Aluminum foil 0 0
Silicon oxide coating 1.0 to 1.5 1.0 to 1.5
Colorless transparent silicon oxide coating (A) 0.4 to 1.0 0.8 to 1.0