A kind of preparation method of non-expanding sealing and capping film for plastic container containing soy sauce

Abstract

The invention belongs to the field of composite flexible package, and particularly relates to a preparation method for a package expansion-free sealing cover film of a plastic container containing soybean sauce. The preparation method comprises the steps of preparation of a PETG printing film, preparation of a VMPET film, preparation of a cast polypropylene film, dry compounding and the like. Stereo block polypropylene and metallocene polyethylene are added into polypropylene resin for modification, and the special base film, namely the cast polypropylene film, produced through a CPP machine has the advantages of low-temperature heat sealing, easy uncovering, high air impermeability and the like. The package expansion-free sealing cover film prepared through the method is of the structure of a PETG film / a VMPET (vacuum polyester aluminum laminated film) / a CPP(cast polypropylene film) composite film. The composite film can fully generate a high-airtight environment for soybean sauce, so that the soybean sauce is in a good state and is not influenced by the outside.

Description

technical field

[0001] The invention relates to the field of composite flexible packaging, in particular to a method for preparing a non-expandable sealing and capping film for a plastic container containing soy sauce. Background technique

[0002] At present, with the demand for convenient and simple packaging, there are more easy-to-open cup lid films on the market. The heat-sealing layer used in most lid film products is functional resin (EVA, EMA, etc.). Resin, in many cases, its hygienic performance cannot meet the requirements of the national standard, and from the perspective of processability, this type of resin has relatively high requirements for production equipment and high technical thresholds.

[0003] Patent 201020174388.4 discloses an easy-to-remove cup lid film, which has the advantages of meeting the GB9683-88 hygienic standard and low production cost, but because the ink layer is on the surface, when the sealing temperature is higher than 200, if the heat ...

Examples

Embodiment 1

[0019] Step 1. Put the PETG film on the unwinding rack of the printing machine, mix the ink, pour it into the ink fountain, and start running at a machine speed of 140 / min. After the PETG film is pulled for front printing, it is dried in an oven at 45°C to obtain PETG printing film;

[0020] Step 2, the raw material PET film is plated with aluminum to form VMPET, and the thickness of the aluminum plated is 0.03 microns;

[0021] Step 3, preparation of cast polypropylene film: Weigh 100 parts by weight of polypropylene, 30 parts by weight of block polypropylene, 15 parts by weight of metallocene polyethylene Elite 5100G, 5 parts by weight of blocking agent and slippery agent , mixing the above raw materials, casting into a film; the block polypropylene is F354NV;

[0022] Step 4, dry compounding: according to the process requirements, put the PETG film, VMPET and cast polypropylene film prepared in step 1-3 in the dry compounding machine, and perform dry compounding to form PE...

Embodiment 2

[0027] Step 1. Put the PETG film on the unwinding rack of the printing machine, mix the ink, pour it into the ink fountain, and start running at a machine speed of 160m / min. After the PETG film is pulled for front printing, it is dried in an oven at 55°C to obtain PETG printing film;

[0028] Step 2, the raw material PET film is plated with aluminum to form VMPET, and the thickness of the aluminum plated is 0.04 micron;

[0029] Step 3, preparation of cast polypropylene film: Weigh 100 parts by weight of polypropylene, 40 parts by weight of block polypropylene, 20 parts by weight of metallocene polyethylene Elite 5110G, 3 parts by weight of blocking agent and smooth agent , mixing the above raw materials, casting into a film; the block polypropylene is F354NV;

[0030] Step 4, dry compounding: according to the process requirements, put the PETG film, VMPET and cast polypropylene film prepared in step 1-3 in the dry compounding machine, and perform dry compounding to form PETG...

technical field

[0001] The invention relates to the field of composite flexible packaging, in particular to a method for preparing a non-expandable sealing and capping film for a plastic container containing soy sauce. Background technique

[0002] At present, with the demand for convenient and simple packaging, there are more easy-to-open cup lid films on the market. The heat-sealing layer used in most lid film products is functional resin (EVA, EMA, etc.). Resin, in many cases, its hygienic performance cannot meet the requirements of the national standard, and from the perspective of processability, this type of resin has relatively high requirements for production equipment and high technical thresholds.

[0003] Patent 201020174388.4 discloses an easy-to-remove cup lid film, which has the advantages of meeting the GB9683-88 hygienic standard and low production cost, but because the ink layer is on the surface, when the sealing temperature is higher than 200, if the heat ...

Examples

Embodiment 1

[0019] Step 1. Put the PETG film on the unwinding rack of the printing machine, mix the ink, pour it into the ink fountain, and start running at a machine speed of 140 / min. After the PETG film is pulled for front printing, it is dried in an oven at 45°C to obtain PETG printing film;

[0020] Step 2, the raw material PET film is plated with aluminum to form VMPET, and the thickness of the aluminum plated is 0.03 microns;

[0021] Step 3, preparation of cast polypropylene film: Weigh 100 parts by weight of polypropylene, 30 parts by weight of block polypropylene, 15 parts by weight of metallocene polyethylene Elite 5100G, 5 parts by weight of blocking agent and slippery agent , mixing the above raw materials, casting into a film; the block polypropylene is F354NV;

[0022] Step 4, dry compounding: according to the process requirements, put the PETG film, VMPET and cast polypropylene film prepared in step 1-3 in the dry compounding machine, and perform dry compounding to form PE...

Embodiment 2

[0027] Step 1. Put the PETG film on the unwinding rack of the printing machine, mix the ink, pour it into the ink fountain, and start running at a machine speed of 160m / min. After the PETG film is pulled for front printing, it is dried in an oven at 55°C to obtain PETG printing film;

[0028] Step 2, the raw material PET film is plated with aluminum to form VMPET, and the thickness of the aluminum plated is 0.04 micron;

[0029] Step 3, preparation of cast polypropylene film: Weigh 100 parts by weight of polypropylene, 40 parts by weight of block polypropylene, 20 parts by weight of metallocene polyethylene Elite 5110G, 3 parts by weight of blocking agent and smooth agent , mixing the above raw materials, casting into a film; the block polypropylene is F354NV;

[0030] Step 4, dry compounding: according to the process requirements, put the PETG film, VMPET and cast polypropylene film prepared in step 1-3 in the dry compounding machine, and perform dry compounding to form PETG...