Analysis of the phenomenon of the hottest high tem

Analysis of the phenomenon of high-temperature cooking bags after high-temperature sterilization

requirements for high-temperature cooking bags in the classification of high-temperature cooking and sterilization bags

(1) the appearance is flat and good, without wrinkles, bubbles and foreign matter attachment

(2) good gas and moisture resistance, good mechanical strength

(3) the measured value of non-toxic, odorless and residual solvent is less than 5mg/m2

(4) no leakage, excellent anti grease performance, the deeds of the three listed companies have declined in different ways, and the oil absorption rate is not 1%

(5) it has excellent heat resistance and pressure resistance. After high-temperature cooking, it is required not to break bags, change color, deform and separate layers

common structure of cooking bags

pet/al/CPP (PE)

pet/n y/CPP (PE)

pet/N Y/Al/CPP (PE)

pet/al/N Y/CPP (PE)

n y/CPP (PE)

common bag shapes: three side sealed, self-supporting bags

commonly used cooking test equipment: medical disinfection pot, cooking pot with back pressure

phenomenon after cooking

appearance: flatness (whether it will curl), whether it is deformed, whether it changes color, and whether it is broken

strength: peel strength, heat sealing strength, pressure resistance, drop resistance, puncture resistance, content resistance, barrier, shading, etc. Solvent residue, odor and toxicity test

appearance classification after cooking

flatness, deformation and bag breakage

1, flat, without obvious deformation

2, relatively flat, with obvious pitting and wrinkling

3. Bags are broken, seals are cracked, and layers are not separated

4. Broken bag, cracked sealing edge, no package leakage

5. Broken bags, delamination, missing bags

appearance analysis after cooking

1, relatively ideal

2. There is more air in the bag; Colloid is soft; The tensile strength of the material is not enough

3. Poor heat sealing strength of materials or problems in bag making process

4. The inner CPP strength is insufficient or the temperature resistant Guoliang copper material: the research and development of new materials of Qianxin copper alloy is poor or the composite structure is unreasonable

5. The inner CPP strength is insufficient or the temperature resistance is poor; The composite strength is not enough

whether the bag changes color (ink part, blank part)

will the transparency of the bag become worse

whether the bag will become hard and brittle

strength analysis after cooking

peel strength: decrease, increase

heat sealing strength: decreased

pressure resistance and drop resistance

puncture resistance

endurance analysis of cooking bags

resistance to contents

barrier performance

solving skills - raw materials

first, from the perspective of film materials

pet: surface tension ≥ 48dyne. Al: small and few pinholes; The surface is clean (surface tension ≥ 40dyne)

n y: it is better to be cooking grade, non hygroscopic, and surface tension ≥ 48dyne

cpp: Cooking grade CPP, surface tension ≥ 39dyne

4) some arguments 1 have always been uncertain. 2. From the aspect of ink,

ink: bright color, high saturation, good composite performance, high temperature resistance (no fading, no discoloration, no reduction in adhesion after cooking), good water resistance

III. from the perspective of glue

glue: high peeling strength, good temperature resistance, peeling after cooking

strength attenuation ≤ 20% or rise, colloid is not sticky, and remains brittle

solution

manuscript design: it is best to have no ink at the edge of the pattern design

product structure: composite structure, bag shape, edge banding, etc. Printing process: selection of ink; dry; Storage interval

compounding process: the gluing amount should meet the requirements (121 ℃ bag ≥ 4g/m2, 135 ℃ bag ≥ 4.5g/m2), curing conditions, compounding steps, etc

bag making process: pressure and temperature

cooking method: packaging and sealing of contents, cooking equipment with back pressure, and cooling process

reprinted from: China Packaging News