CN219988684U

CN219988684U - Packaging structure for food preservative

Info

Publication number: CN219988684U
Application number: CN202320608265.4U
Authority: CN
Inventors: 刘龙; 洪志强; 李鑫俊
Original assignee: Hangzhou Ting Zheng Packing Material Co ltd
Current assignee: Hangzhou Ting Zheng Packing Material Co ltd
Priority date: 2023-03-20
Filing date: 2023-03-20
Publication date: 2023-11-10
Anticipated expiration: 2033-03-20

Abstract

The utility model discloses a food preservative packaging structure which comprises breathable paper, an inner coating and an outer decorative layer, wherein the breathable paper is double-sided tape or kraft paper, the inner coating and the outer decorative layer are respectively arranged on two sides of the breathable paper, the inner coating is a breathable inner coating, the outer decorative layer is a breathable outer decorative layer, and the inner coating, the breathable paper and the outer decorative layer do not contain perfluorinated or polyfluoroalkyl substances.

Description

Packaging structure for food preservative

Technical Field

The utility model relates to the field of food packaging, in particular to a food preservative packaging structure.

Background

The food preservative is used for preventing food from deterioration caused by microorganism propagation during storage and circulation, or deterioration of food internal quality and color and luster due to bad storage and sales conditions, and is used in food for improving shelf life and prolonging edible value. The food preservative cannot be stored separately and must be packaged by a special packaging material before being placed with the food.

As disclosed in patent publication CN202608156U, the packaging material for food preservative currently in common use comprises a plastic film layer (reference numeral 1 in the literature), a first adhesive layer (reference numeral 2 in the literature), a non-porous breathable layer (reference numeral 3 in the literature, and the non-porous breathable layer itself is actually perforated), a second adhesive layer (reference numeral 4 in the literature) and a heat-sealable breathable film layer (reference numeral 5), and the plastic film layer, the first adhesive layer, the second adhesive layer and the heat-sealable breathable film layer are provided with holes in order to ensure that the preservative is prevented from leaking out, and the holes between adjacent layers must be in a staggered state (a staggered perforation technique is required). In practice, the dislocation perforation is easy to form through holes (i.e. holes between adjacent layers are in a straight line to form through holes) in use, and the leakage of the food preservative is easy to be caused by the formation of the through holes.

Disclosure of Invention

The utility model provides a food preservative packaging structure aiming at the problems.

The technical scheme adopted by the utility model is as follows:

the utility model provides a food preservative packaging structure, includes ventilative paper, undercoating and outer decorative layer, ventilative paper is two offset paper or kraft paper, undercoating and outer decorative layer set up respectively in ventilative paper's both sides, and the undercoating is ventilative undercoating, and outer decorative layer is ventilative outer decorative layer, do not contain perfluoro and polyfluoroalkyl material in undercoating, ventilative paper and the outer decorative layer.

In the packaging structure of the food preservative, the breathable paper which is the breathable material is adopted, and the two sides of the breathable paper are respectively provided with the breathable inner coating and the outer decorative layer, so that after three layers are attached, the breathability of the whole packaging material can be ensured, and the existence of the inner coating can ensure that the whole packaging material has good waterproof performance and oil-proof performance due to the fact that the inner coating is prepared from EVA powder and polyethylene wax emulsion.

In the packaging material, all layers do not contain perfluoro and polyfluoroalkyl substances (namely PFAS), so that the problems of environmental protection and food safety risks caused by fluorine-containing chemicals and the like are solved.

Optionally, the outer decorative layer includes a print layer and an outer coating layer, the outer coating layer being attached to the breathable paper sheet, the print layer being attached to the outer coating layer.

It should be noted that the printed layer is not a completely existing coating layer, but a relief pattern formed on the top coating layer or the air-permeable paper by flexography or gravure or the like, the relief pattern is attached to the air-permeable paper or the top coating layer, and the relief pattern (printed layer) itself is formed by deformation of the air-permeable paper or the top coating layer, so that the printed layer is not a single layer but a relief generated by deformation. Since the print layer is raised by deformation of the top coat or the gas permeable paper, the presence of the print layer does not clog the gas permeable paper or the top coat. Also, because the print layer is typically a pattern or text (which is typically some information describing the food preservative), the text with the sprayed text does not cover the entire topcoat (or the entire gas-permeable sheet), the print layer may be sprayed on the topcoat or the gas-permeable sheet with a paint.

Optionally, the outer decorative layer comprises a plastic film, the plastic film is attached to the breathable paper by an adhesive, and the plastic film is breathable.

In order to ensure the air permeability of the plastic film, if the plastic film is an air permeable plastic film, no holes are needed to be drilled on the plastic film, and when the plastic film is not an air permeable plastic film, holes are needed to be drilled on the plastic film, so that the air permeability of the whole packaging material is ensured.

Optionally, a printing layer is arranged on the plastic film sheet, and the printing layer is in contact with the adhesive.

Optionally, the plastic film is a perforated plastic film.

Optionally, the plastic film is a PET film or a PE film.

Optionally, the grammage of the breathable paper is 30-80g/m ² The coating weight of the inner coating is 2-20g/m ² 。

Optionally, the thickness of the inner coating is less than the thickness of the air permeable paper.

The beneficial effects of the utility model are as follows: all layers do not contain perfluoro and polyfluoroalkyl substances (namely PFAS), so that the problems of environmental protection and food safety risks caused by fluorine-containing chemicals and the like are solved.

Description of the drawings:

FIG. 1 is a schematic diagram of the structure of embodiment 2;

FIG. 2 is a schematic diagram of the structure of embodiment 3;

FIG. 3 is a schematic diagram of the structure of example 4.

The reference numerals in the drawings are as follows: 1. an inner coating; 2. breathable paper; 3. an outer coating; 4. printing a layer; 5. an adhesive layer; 6. a plastic film.

The specific embodiment is as follows:

the present utility model will be described in detail with reference to the accompanying drawings.

Example 1

Method for preparing paint

The EVA powder, the polyethylene wax emulsion, the deionized water and the auxiliary agent are mixed together, emulsification is carried out, and after the emulsification is completed, the coating is prepared, wherein the EVA powder accounts for 58% of the total coating mass, the polyethylene wax emulsion accounts for 10% of the total coating mass, the deionized water accounts for 30% of the total coating mass, and the auxiliary agent accounts for 2% of the total coating mass.

In the coating, the EVA powder is present, so that the whole coating has good water and oil resistance and heat sealing performance after being coated. The polyethylene wax emulsion exists, so that the whole coating has good anti-adhesion property.

The auxiliary agent in this embodiment may be one or more of an active agent, a neutralizing agent, a defoaming agent, and a leveling agent.

In other variant embodiments EAA powder or EMA powder or EMMA powder may be used instead of EVA powder.

The ratio of the components in this example to the total coating composition can be adjusted as desired.

Example 2

Referring to fig. 1, white kraft paper is selected as the breathable paper 2, the coating prepared in example 1 is coated on one side of the breathable paper as the inner coating 1, then a plastic film 6 is selected as the outer decoration layer, one side of the plastic film is printed with characters and patterns (i.e. a printing layer 4) in a printing manner, then an adhesive (forming a very thin adhesive layer 5) is coated on the plastic film (glue is coated on one side printed with the characters and patterns), and then the plastic film and the breathable paper (uncoated position) are bonded together, so that a whole package is finally formed.

In this embodiment, the white kraft paper is 30g/m ² The amount of the inner coating applied in this example was 2g/m ² (dry basis).

In this embodiment, the plastic film sheet is a PET plastic film with a thickness of 8um, and ventilation holes are formed in the PET plastic film, and the ventilation holes may be diamond-shaped or circular. The thickness of the specific PET plastic film can be selected from 8-20 mu m.

As a modified embodiment of this example, the plastic film may be a breathable PE film or a breathable PET film, and when the breathable PE film or the breathable PET film is used, no perforation is required. When a breathable PE film or a breathable PET film is used, the film thickness may be 8-40 μm.

In this embodiment, the coating may be applied by an on-line coating method integrated with a paper machine, such as a size press or a coater, or may be applied by secondary processing on other coating devices after forming paper, and in particular, the coating may be applied by a curtain or air knife or a doctor blade or dip coating or metering or spray coating or a roll or flexo or gravure or offset press or a screen machine, and the like. In this embodiment, the coating layer may be dried by natural gas heat or steam or electric air or infrared after the coating is completed.

As a more preferable mode, the coating can be formed by adopting a mode of coating twice, the coating formed by the two times of coating is respectively a first partial coating and a second partial coating, the first partial coating and the second partial coating are combined together to form the coating, the specific operation method is as follows, the first partial coating is coated by using a special coating machine of an anilox roller, the coating speed is 100m/min, the first partial coating adopts a 230-mesh anilox roller, and the ratio of 1-1.5 g/m ² The (dry basis) suspension type electric hot air drying is carried out, the drying temperature is 80 ℃, the first coating can be a coating with relatively low cost, and the coating is mainly used for filling the concave-convex surface of paper. The second coating is a 300 mesh anilox roller, 1g/m ² The suspension type electric hot air drying is carried out at the drying temperature of 80 ℃, and the second sub-coating layer uses coating liquid with high performance, so that the film forming property of the surface is improved, the coating is more uniform, and after the second sub-coating layer is attached to the first sub-coating layer, the second sub-coating layer and the first sub-coating layer form the coating layer together.

Example 3

Referring to FIG. 2, white kraft paper was used as the air-permeable paper 2, and the coating prepared in example 1 was applied to both sides of the air-permeable paperFor the inner coating layer 1 and the outer coating layer 3, respectively, the coating amount of the inner coating layer and the outer coating layer was 2g/m ² After the inner coating and the outer coating are completely dried, a layer of patterns and characters (namely a printing layer 4) are formed on the outer coating by a flexography or gravure or spraying mode.

In this embodiment, the white kraft paper is 30g/m ² Is a white kraft paper.

Example 4

Referring to fig. 3, white kraft paper is selected as the air-permeable paper 2, the coating prepared in example 1 is coated on one side of the air-permeable paper to form an inner coating 1, then a layer of patterns and characters (i.e. a printing layer 4) are formed on the outer coating by flexography, gravure or spraying, then a pattern (i.e. a printing layer) is printed on the air-permeable paper (the side not attached with the coating) by flexography, gravure or spraying, and then the coating shown in example 1 is coated on the printing layer to form an outer coating 3, thus obtaining the packaging material.

The application amount of the inner coating layer and the outer coating layer in this example was 2g/m ² (dry basis).

In this embodiment, the white kraft paper is 30g/m ² Is a white kraft paper.

In particular, in examples 2 to 4, the air-permeable paper may be double-sided offset paper in addition to white kraft paper. In the coating layer prepared in coating example 1, a coating method such as roll coating, air knife coating, curtain coating, and dip coating can be used.

The packaging materials prepared in example 2, example 3 and example 4 were tested for water repellency, oil repellency and air permeability by referring to GB/T41896-2022, and the test results are shown in Table 1 below.

Table 1 test results

	Waterproof property	Oil repellency	Air permeability
				National standard	≤30g/m ²	≤30g/m ²	≤3000
Example 1	≤15	≤10	≤500
				Example 2	≤10	≤8	≤500
Example 3	≤10	≤8	≤500

The foregoing description is only of the preferred embodiments of the present utility model, and is not intended to limit the scope of the utility model, but is intended to cover all equivalent modifications, direct or indirect, as would be included in the scope of the utility model.

Claims

1. The utility model provides a food preservative packaging structure, its characterized in that includes ventilative paper, undercoating and outer decorative layer, ventilative paper is two offset paper or kraft paper, undercoating and outer decorative layer set up respectively in ventilative paper's both sides, and the undercoating is ventilative undercoating, and outer decorative layer is ventilative outer decorative layer, do not contain perfluoro and polyfluoroalkyl material in undercoating, ventilative paper and the outer decorative layer.

2. The food preservative packaging structure according to claim 1, characterized in that the outer decorative layer comprises a printed layer and an outer coating layer, the outer coating layer being attached to the gas-permeable paper sheet, the printed layer being attached to the outer coating layer.

3. The food preservative packaging structure according to claim 1, characterized in that the outer decorative layer comprises a printed layer and an outer coating layer, the outer coating layer being attached to the gas-permeable paper sheet, the printed layer being attached to the outer coating layer.

4. The food preservative packaging structure according to claim 1, characterized in that the outer decorative layer comprises a plastic film sheet, the plastic film sheet is attached to the breathable paper sheet by an adhesive, and the plastic film sheet is a breathable plastic film sheet.

5. The food preservative packaging structure according to claim 4, characterized in that the plastic film is provided with a printed layer, and the printed layer is in contact with the adhesive.

6. The food preservative packaging structure according to claim 4, wherein the plastic film is a perforated plastic film.

7. The food preservative packaging structure according to claim 4, wherein the plastic film is a PET film or a PE film.

8. The food preservative packaging structure according to claim 1, characterized in that the ventilation is providedThe grammage of the paper is 30-80g/m ² The coating weight of the inner coating is 2-20g/m ² 。

9. The food preservative packaging structure according to claim 1, characterized in that the thickness of the inner coating is smaller than the thickness of the air-permeable paper.