Review of the hottest high temperature cooking fil

Summary of high temperature cooking film

with the development of China's economy, the prosperity of tourism and the rise of the golden week economy, people have an increasing demand for convenience food. All kinds of soft cans and high-temperature cooked food not only have many varieties, but also have a large market space for the development of the extruder industry. A large number of food packaging products with high barrier, high impact resistance, high temperature cooking resistance, high pressure resistance and medium resistance came into being, thus ensuring the freshness and nutrition of convenience food, extending the shelf life of convenience food, and being the best packaging material for soft cans

high temperature cooking can kill all bacteria (135 ℃), with a long storage period. The high barrier transparent bag has a storage period of about one year, and the aluminum foil cooking bag has a storage period of about two years; The oxygen permeability and moisture permeability are close to zero, and the food is not easy to deteriorate; High thermal strength; It can be stored at room temperature

its raw materials mainly include pet (mainly b0pet), PA (mainly b0pa), PP (mainly rcpp and SCPP), Al (mainly aluminum foil), coextrusion PA film, coextrusion ev0h film, PVDC coating film, etc

classification of high-temperature cooking bags

l, and structural classification

class A: PA/CPP, PET/CPP. Pervious steam: ≤ 15g/(m · 24h); Oxygen permeability: ≤ 120cm/(M2 · 24h · 0.1hpa). Class B: PA/Al/CPP, PET/Al/CPP. Pervious steam: ≤ 0.5g/(m · 24h); Oxygen permeability: ≤ 0.5cm/(m · 24h · 0.1MPa). Class C: PET/PA/Al/CPP, PET/Al/PA/CPP. Pervious steam: ≤ 0.5g/(m · 24h); Oxygen permeability: ≤ 0.5cm/(m · 24h · 0.1MPa)

2 classified by cooking temperature (cooking time is about minutes), when the relative pressure is PS 110 lb/in, the corresponding temperature is l15c; The shelf life is about 3 months

when the relative pressure is PS 115 lb/in, the corresponding temperature is 121cc; The shelf life is about 6 months

when the relative pressure is PS 120 lb/in, the corresponding temperature is 126cc; The shelf life is about 12 months (transparent bag)

when the relative pressure is PS1 30 lb/in, the corresponding temperature is 135cc; The shelf life is about 24 months (aluminum foil bag)

of course, the shelf life is also closely related to the barrier of cooking bags and the type of food

moderate temperature cooking CPP (rcpp) select the suitable pulling machine and high temperature cooking CPP

(SCPP) characteristics

the main characteristics of cooking CPP film are: good flatness is required; High tensile strength; High heat sealing strength; High heat sealing temperature (not only the marathon requires high heat sealing strength under high temperature and high pressure during cooking); High impact strength (requires puncture resistance and package breaking resistance under high temperature and high pressure during cooking); The elongation at break is moderate; Good medium resistance, etc

the main raw material of cooking grade CPP film is block copolymerized impact polypropylene. Its performance requirements are: Vicat softening point temperature should be greater than cooking temperature; The haze should be as small as possible (because the haze of block copolymerization is relatively large); Good impact resistance; Good medium resistance; Fish eyes and crystal points should be as few as possible

the production of block copolymerized impact polypropylene is difficult, and the market development is difficult, so there are few domestic products, which are basically imported raw materials. Due to the high technical requirements and costs of membrane grade block copolymerization impact polypropylene raw materials, some domestic manufacturers are trying to use binary heat sealing polypropylene materials with high heat sealing temperature and injection molding grade block copolymerization impact polypropylene materials to replace membrane grade block copolymerization impact polypropylene raw materials

when using binary heat sealing polypropylene with high heat sealing temperature, there is no problem with heat sealing temperature and heat strength, the haze is also very good, and there are few fish eyes and crystal points, but the tensile strength, impact resistance, medium resistance, elongation at break and other performance indicators may be poor

when using injection grade block copolymer impact polypropylene, the impact resistance, medium resistance and other indicators are acceptable, but there are many fish eyes and crystal points, and the tensile strength, elongation at break, haze and other performance indicators may be poor

high temperature cooking ink

the first is the selection of ink binder (to ensure the stability of binder under high temperature cooking temperature); The second is the selection of ink Colorants (to ensure the color stability of colorants at high cooking temperature); The third is the selection of ink curing agent (pay attention to the selection of curing agent when using two-component ink)

pay attention to the differences: ordinary cooking resistant ink; High temperature resistant cooking ink; Ultra high temperature resistant cooking ink. We should also pay attention to the problem of ink color conversion, the problem of adding new curing agent when the two-component residual ink is mixed with new ink, and the problem of inch scratch reduction when the curing agent is excessive

high temperature resistant cooking adhesive

high temperature resistant cooking bags need to be sterilized by high temperature cooking. They should choose 121 CC inch high temperature and 135 CC ultra-high temperature resistant cooking adhesives. Ordinary adhesives must not be used. Ordinary adhesives are not temperature resistant. Composite film bags will usually be layered under 80 l ℃, and the peel strength is very low

high temperature resistant cooking adhesives should have good adhesion to the treated pet, polyolefin, aluminum foil, aluminum foil plating, PVDC coating and extruded hot fishing film, as well as excellent inch cooking and chemical resistance. Color measurement method for color building materials GB 11942 (9) medium corrosiveness

the main components of general two-component polyurethane adhesive are: mixture of Polyester Polyols (polyester polyurethane), modified isocyanate adduct (polyisocyanate). In use, attention should be paid to ensure the dry coating amount, the residue of dissolution should be as little as possible, and the ripening should be sufficient

if the amount of curing agent is too small, the crosslinking degree of curing agent and resin is low, and the adhesion strength, heat resistance and hydrolytic resistance of the ink layer will be reduced; If too much, excessive crosslinking will occur, affecting the crystallization and microscopic phase separation between polymers, increasing the cohesion of the adhesive layer, and excessive shrinkage of the ink layer, causing delamination. If the ripening time is not enough, the crosslinking is not sufficient, and the ink layer temperature and hydrolysis are reduced; If the curing time is too long or the curing temperature is too high, the bonding will be excessive and the peel strength will decrease. For batch cooking bags, the cooking performance should be confirmed before use

new high barrier cooking film

with the seven layer coextrusion casting film production line and seven layer and nine layer film blowing production lines, as well as various high barrier diaphragm production lines have been put into production, the production raw materials of new high barrier cooking bags are more abundant

five layer coextrusion film mainly includes PP/AC/ev0h/AC/PP or PE/AC/ev0h/AC/PE

seven layer coextrusion film mainly includes: PP/AC/PA/ev0h/PA/AC/PP or PE/AC/PA/ev0h/AC/PA/PE

high barrier composite substrates include: B0 ev0h or c-ev0h, PVDC/B0 ev0h/PVDC (k-ev0h), PVDC/b0pva/PVDC (k-pvva), PVDC/BOPA/PVDC (k PA), PVDC/BOPET/PVDC (k-p ET), PVDC (co blown film), etc

the use of these new packaging materials has not only greatly extended the shelf life of food, kept the freshness and nutrition of food to the greatest extent, but also reduced the package breaking phenomenon during vacuum pumping, high pressure and pressure fluctuation to a considerable extent, thus greatly reducing the cost and popularizing the packaging of high-end convenience food