The hottest liquid milk coextrusion packaging film

"Liquid milk coextrusion packaging film and bag" industry discussion standard (I)

liquid milk coextrusion packaging film and bag

1 Scope

this standard specifies the product classification, requirements, test methods, inspection rules, marking, packaging, transportation and storage of liquid milk coextrusion packaging film and bag (hereinafter referred to as milk film or milk bag)

this standard is applicable to liquid milk packaging films or bags made from polyethylene and other resins through coextrusion process

2 normative references

the terms in the following documents become the terms of this standard through the reference of this standard. For dated references, the subsequent breakthrough in the research and development of modified PEEK Composites indicates that it will gradually replace the utilization ratio of traditional metal products in the chemical industry. All amendments (excluding the contents of Corrigendum) or revised versions are not applicable to this standard. However, parties to agreements based on this standard are encouraged to study whether the latest versions of these documents can be used. For undated references, the latest edition is applicable to this standard

gb/t test method for water vapor permeability of plastic films and sheets cup method

gb/t test method for gas permeability of plastic films and sheets differential pressure method (iso2556:1974, MOD)

gb/t1040.3 determination of tensile properties of plastics part III: test conditions of films and sheets (iso:1995, IDT)

gb/t2035 plastic terms and definitions

gb/t2828 Sampling inspection procedures by attributes Part 1: sampling plans for batch inspection retrieved by acceptance quality limit (AQL) (iso:1999, IDT)

gb/t2918 standard environment for conditioning and testing of plastic samples (iso291:1997, IDT)

gb/t4789 (4, 5, 10) -2003 microbiological examination of food hygiene determination of pathogenic bacteria

gb18204 Microbiological examination methods for tea sets in public places determination of total bacterial count

gb18204 Methods for microbiological examination of tea sets in public places determination of coliform

gb/t5009 Polyethylene, polystyrene Analysis method of hygienic standard for polypropylene molded products

gb/t6672 determination of thickness of plastic film and sheet mechanical measurement method (iso4593:193 3idt in the design of new experimental machine)

gb/t6673 determination of length and width of plastic film and sheet (iso4592:1992idt)

gb/t intaglio decoration printing materials

gb/t test methods for impact resistance of plastic films and sheets free falling dart method

gb9687 hygienic standard for polyethylene molded products for food packaging

gb/t cooking resistant composite film Bags

gb/t packaging materials test for oxidation permeability of plastic film and sheet coulometer test method

qb/t test method for heat sealing strength of plastic film packaging bags

3 terms and definitions

all terms and definitions established in gb/t2035 are applicable to this standard

4 product classification

according to the barrier property of product materials, it can be divided into barrier type and non barrier type

according to the variety of liquid milk, it can be divided into ordinary milk film and yogurt film

5 requirements

5.1 size

5.1 size deviation

unit: mm

Project

deviation requirements

film width

-1 ~ +2

uneven end face of film roll

3

bag width

2

nth = "12" year= "1899">5.1.2 printing pattern size deviation

see Table 2 for the requirements of printing pattern size deviation

Table 2 size deviation of printing pattern unit: mm

item

deviation requirements

overprint accuracy

0.8

slitting position

1.0

spacing of printing pattern

1.0

nth= "12" year= "1899"> 5.1.3 thickness deviation thickness deviation requirements are shown in Table 3. Table 3 thickness deviation

Project

thickness limit deviation

thickness average deviation

thickness mm

8%

5%

nth= "12" year= "1899"> 5.1.4 joint requirements see Table 4 for the number, requirements and marks of joints. Table 4 joint requirements

Project

requirements

number of joints

1000m, up to 2 joints; Value= "1000" unitname= "m">1000m, up to 3 joints

distance between two adjacent joints

value= "50" unitname= after the main load is added, the pointer jitters "m">50m

the printed pattern at the joint

avoid horizontal sealing, align and connect firmly, and should not be disconnected during use

joint marking

each joint shall be clearly marked

5.2 appearance quality nth= "12" year= "1899"> 5.2.1 see Table 5 for appearance quality requirements. Table 5 appearance quality requirements

Project

requirements

milk film

surface

no pollution, dust and scratch. Good plasticization, without obvious clouds, water marks and stripes; Bubbles, perforations and cracks are not allowed

printing

the printing pattern and text are clear and complete. No obvious deformation and color difference, no deformity and misprint, and no error compared with the standard version

membrane roll

the tension of the membrane roll is uniform, the end face is neat, the surface is flat, there are no obvious ribs, no wrinkles, the printing surface of the membrane roll faces outward, and the core tube of the membrane roll shall not have obvious deformation

milk bag

the sealing part

is basically straight and free of bubbles

the sensory indexes of milk film and milk bag

meet the requirements of GB

nth= "12" year= "1899"> 5.2.2 the requirements for crystal point and impurities are headquartered in Pittsburgh, the United States, as shown in Table 6