Novel environment-friendly thermal insulation paper bag

Abstract

The paper structure of the paper bag comprises a paper surface layer and a bubble paper layer, the outer surface of the paper surface layer is coated with an outer waterproof layer, the bubble paper layer comprises a bubble paper base layer, a glue layer, an aluminized layer and an inner waterproof and oil-proof layer which are sequentially arranged from outside to inside, and bubble embossing forming is carried out on the whole. The inner surface of the paper surface layer is compounded with the outer surface of the bubble paper base layer through the heat-insulating glue layer. The paper bag is high in environmental protection property and good in heat preservation effect, and has a certain falling and damage resisting effect and certain waterproof and oil-proof capacity.

Description

Technical Field

[0001] The invention belongs to paper bags, and in particular relates to a novel environment-friendly heat-insulating paper bag. Background Art

[0002] Since the 19th century, the emergence of packaging bags has truly greatly promoted the retail industry. Packaging bags perfectly integrate the advantages of environmental protection, lightness, and easy carrying, which greatly facilitates people's lives. At present, the common packaging bags on the market are: plastic bags, non-woven packaging bags, paper bags, paper-plastic composite bags, etc. Studies have shown that the main material of plastic bags and paper-plastic composite bags is PE, while non-woven packaging bags are mainly PP and PE. These materials are all petrochemical film materials, which are prone to produce microplastic particles during the manufacturing and decomposition process. Not only are they scattered in nature and difficult to degrade, they are more likely to enter water sources, soil, atmosphere and food chains, posing a potential threat to the ecological environment and human health.

[0003] From the principle of heat preservation, we know that by reducing the three heat transfer methods of heat conduction, heat convection and heat radiation, the speed of heat loss can be slowed down, thereby achieving the effect of heat preservation. Traditional non-woven packaging bags are mostly made of non-woven fabrics with an aluminum layer, which only reduces heat radiation. Therefore, the heat preservation effect is limited and cannot meet the heat preservation needs of consumers. In addition, since the raw material of traditional non-woven insulation bags is PP, they cannot be recycled and reused like paper bags. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a new type of environmentally friendly heat-insulating paper bag, which can use paper with high recycling characteristics as a material and has an excellent heat-insulating effect.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] On the one hand, a new type of environmentally friendly thermal insulation paper bag, the paper structure used in the paper bag includes a paper surface layer and a bubble paper layer, the outer surface of the paper surface layer is coated with an outer waterproof layer, the bubble paper layer includes a bubble paper base layer, a glue layer, an aluminum plating layer, and an inner waterproof and oil-proof layer arranged in sequence from the outside to the inside, and the whole is bubble embossed, and the inner surface of the paper surface layer is compounded with the outer surface of the bubble paper base layer through the heat-insulating glue layer.

[0007] The bubble paper base layer is corrugated base paper, natural color kraft paper or single gloss white kraft paper.

[0008] The glue layer and the heat-insulating glue layer are one of vinyl acetate-ethylene copolymer emulsion, water-based styrene-butadiene rubber emulsion and water-based acrylic resin glue.

[0009] The inner waterproof and oil-proof layer is a water-based acrylic ester environmentally friendly oil-proof coating, and its base material is prepared from one or more of modified starch, polyvinyl alcohol, chitosan, biological wax, and sodium alginate.

[0010] The paper surface layer is coated paper, kraft paper, boxboard, offset paper or newsprint.

[0011] The outer waterproof layer is synthesized or compounded with one or more of acrylic emulsion, liquid biological wax, carboxymethyl chitosan, polydimethylsiloxane, hexadecyl trimethoxysilane and papermaking reinforcing agent as base materials.

[0012] The papermaking reinforcing agent is a cationic emulsion.

[0013] On the other hand, a method for making paper used for a novel environmentally friendly thermal insulation paper bag comprises the following steps:

[0014] A. Apply an outer waterproof layer to the outer surface of the paper surface layer;

[0015] B. coating a glue layer on the outer surface of the aluminum-plated layer and coating it on the inner surface of the bubble paper base layer by transferring aluminum;

[0016] C. Coating an inner waterproof and oil-proof layer on the inner surface of the aluminum-plated layer;

[0017] D. Bubble embossing is performed on the composite bubble paper base layer, glue layer, aluminum plating layer, and inner waterproof and oil-proof layer as a whole to form a bubble paper layer;

[0018] E. Compound the inner surface of the paper surface layer with the outer surface of the bubble paper base layer through the heat-insulating glue layer.

[0019] In step A or C, the coating method is printing glazing.

[0020] In step E, the composite method is paper mounting.

[0021] The novel environmentally friendly heat-insulating paper bag of the present invention has the following advantages:

[0022] 1. High environmental protection: Since the raw materials of the paper bag are all paper, the aluminum plating layer adopts the form of transfer aluminum, which can be recycled with the paper pulping.

[0023] 2. Good heat preservation effect: When using this paper bag, the temperature of 95℃ beverages is still 75℃ within 60 minutes, and the heat preservation effect is good.

[0024] 3. It has a certain effect of resisting falling and damage: Since the sandwich layer of the paper bag is bubble paper, compared with the rigid structure of other paper bags, the unique structure of bubble paper can absorb the impact force when the paper bag falls, thereby protecting the contents of the paper bag.

[0025] 4. It has certain waterproof and oil-proof capabilities: Compared with conventional paper bags, this type of paper bag has added internal and external waterproof and oil-proof coatings, and is not easily affected by various humid environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The invention is described in detail below with reference to the accompanying drawings and specific embodiments:

[0027] Figure 1 It is a schematic diagram of the layered structure of the wall of the novel environmentally friendly heat-insulating paper bag of the present invention. DETAILED DESCRIPTION

[0028] A novel environmentally friendly heat-insulating paper bag of the present invention is as follows Figure 1 As shown, the paper structure used in the paper bag includes a paper surface layer 6 and a bubble paper layer. The outer surface of the paper surface layer 6 is coated with an outer waterproof layer 7. The bubble paper layer includes a bubble paper base layer 4, a glue layer 3, an aluminum-plated layer 2, and an inner waterproof and oil-proof layer 1 which are arranged in sequence from the outside to the inside, and the whole is bubble embossed. The inner surface of the paper surface layer 6 is compounded with the outer surface of the bubble paper base layer 4 through a heat-insulating glue layer 5.

[0029] The bubble paper base layer 4 can be made of corrugated paper, natural kraft paper or single-gloss white kraft paper, etc., with a gram weight of 20-100g / m 2 Not waiting.

[0030] The glue layer 3 and the heat-insulating glue layer 5 can both be made of one of vinyl acetate-ethylene copolymer emulsion, water-based styrene-butadiene glue, and water-based acrylic resin glue, and other functional materials can be compounded according to different needs. For example, adding 5 to 10% hollow structure inorganic matter can effectively reduce air heat convection and water vapor loss, thereby achieving the effect of slowing down heat loss.

[0031] The inner waterproof and oil-proof layer 1 can be a water-based acrylic environmentally friendly oil-proof coating, and its base material is prepared from one or more of modified starch, polyvinyl alcohol, chitosan, biowax, and sodium alginate.

[0032] The paper surface layer 6 can be coated paper, kraft paper, boxboard, offset paper or newsprint.

[0033] The outer waterproof layer 7 can be synthesized or compounded using one or more of acrylic emulsion, liquid biowax, carboxymethyl chitosan, polydimethylsiloxane, hexadecyl trimethoxysilane and some papermaking reinforcing agents such as cationic emulsion as base materials.

[0034] The method for making the paper used for the paper bag specifically comprises the following steps:

[0035] A. Coat the outer surface of the paper surface layer 6 with an outer waterproof layer 7. The coating method can be printing glazing. The dry coating amount can be controlled at 2-5g / m 2 No wait;

[0036] B. coating a glue layer 3 on the outer surface of the aluminum-plated layer 2 and coating it on the inner surface of the bubble paper base layer 4 by transferring aluminum;

[0037] C. Coat the inner surface of the aluminum-plated layer 2 with an inner waterproof and oil-proof layer 1. The coating method can be printing glazing or coating machine coating. The dry coating amount is 1-3g / m 2 No wait;

[0038] D. Bubble embossing is performed on the composite bubble paper base layer 4, glue layer 3, aluminum plating layer 2, and inner waterproof and oil-proof layer 1 to form a bubble paper layer. The bubble diameter varies from 5 to 20 mm and the height is 5 to 20 mm. It can be adjusted according to other additional requirements such as buffering, etc.;

[0039] E. The inner surface of the paper surface layer 6 is laminated with the outer surface of the bubble paper base layer 4 through the heat-insulating glue layer 5. The lamination method is paper mounting, and the dry glue weight is 3-5g / m 2 Not waiting.

[0040] Example:

[0041] 70g / ㎡ white kraft paper is selected as the face paper layer 6, and the outer waterproof coating 7 is compounded with acrylic emulsion and liquid bio-wax in a ratio of 19:1; the bubble paper composite structure is made by using vinyl acetate-ethylene copolymer emulsion as aluminum-plated glue, and after 50g / ㎡ white kraft paper is aluminum-plated and an aluminum layer 2 is added, the surface is coated with an inner waterproof and oil-proof coating 1, which uses 106KS water-resistant varnish (manufacturer: Shanghai Baiyi New Materials Co., Ltd.); after the waterproof and oil-proof aluminum-plated paper is formed, bubble paper is formed by embossing, and the bubble diameter is 8mm and the height is 5mm; the heat-insulating glue layer 5 is used as the mounting glue for the face paper and the bubble paper, and vinyl acetate-ethylene copolymer emulsion is used, and 5-10% of hollow glass microspheres with a diameter of 0.2-0.5um are added to the glue; finally, after the above four-layer structure is mounted, the height is reduced to 2mm.

[0042] Insulation test: Control the test room temperature and humidity to 25℃, 50% RH, fill a common 16-ounce hot drink paper cup with 92℃ hot water, fill the liquid to a height of 12mm from the cup mouth, and cover the cup lid. Put the hot drink into various packaging single cup bags and seal them, and monitor the temperature change after 60 minutes. The specific test temperature data is as follows:

[0043]

[0044]

[0045] In summary, the new environmentally friendly thermal insulation paper bag of the present invention uses paper with high recycling characteristics as the material from the perspective of environmental protection, and performs special treatment on the base paper for high-efficiency thermal insulation, waterproof and oil-proof functions:

[0046] 1. Waterproof function: A waterproof coating is formed on the surface of the paper by printing and glazing on the outer layer of the surface paper.

[0047] 2. Insulation function: According to three different heat transfer modes, the corresponding schemes are designed in a targeted manner for efficient insulation. First, the high thermal conductivity of air is used to introduce a new material, bubble paper: base paper with a certain strength is selected, and the structure of the PE bubble film is simulated for embossing and then cut into shape. Different from the base paper of ordinary paper bags, the bubble paper of the present invention can play the role of heat insulation of air through the bubble structure, which plays a role in reducing heat convection; at the same time, it retains high recyclability and high environmental protection. Secondly, in order to effectively reduce heat radiation, an aluminum layer with high reflectivity is used. However, ordinary aluminum layer composite insulation materials are mainly composited with PET aluminized film, which is difficult to recycle. The paper bag of the present invention uses aluminum plating instead, abandoning the traditional PET aluminized film, which has the same effect of reducing heat radiation and can be recycled with ordinary paper. Finally, in order to further achieve better and efficient insulation effect, glue with better heat insulation ability is selected in the composite glue, and other functional materials can be compounded according to different needs, which can effectively reduce air heat convection and water vapor loss, thereby achieving the effect of slowing down heat loss.

[0048] 3. Oil-proof function: The inner surface of the bubble paper is mainly coated with oil-proof coating, which is more conducive to containing and packaging some liquid products that are easy to spill.

[0049] However, those skilled in the art should recognize that the above embodiments are only used to illustrate the present invention, and are not intended to limit the present invention. As long as they are within the spirit of the present invention, any changes or modifications to the above embodiments will fall within the scope of the claims of the present invention.

Claims

1. A new type of environmentally friendly thermal insulation paper bag, characterized by: The paper structure used in the paper bag includes a paper surface layer and a bubble paper layer. The outer surface of the paper surface layer is coated with an outer waterproof layer. The bubble paper layer includes a bubble paper base layer, a glue layer, an aluminum-plated layer, and an inner waterproof and oil-proof layer which are arranged in sequence from the outside to the inside, and the whole is bubble embossed. The inner surface of the paper surface layer is compounded with the outer surface of the bubble paper base layer through a heat-insulating glue layer.

2. The new environmentally friendly thermal insulation paper bag according to claim 1 is characterized by: The bubble paper base layer is corrugated base paper, natural color kraft paper or single gloss white kraft paper.

3. The new environmentally friendly thermal insulation paper bag according to claim 1 is characterized by: The glue layer is one of vinyl acetate-ethylene copolymer emulsion, water-based styrene-butadiene rubber emulsion and water-based acrylic resin glue.

4. The novel environmentally friendly heat-insulating paper bag according to claim 1 is characterized in that: The inner waterproof and oil-proof layer is a water-based acrylic ester environmentally friendly oil-proof coating, and its base material is prepared from one or more of modified starch, polyvinyl alcohol, chitosan, biological wax, and sodium alginate.

5. The new environmentally friendly thermal insulation paper bag according to claim 1 is characterized by: The paper surface layer is coated paper, kraft paper, boxboard, offset paper or newsprint.

6. The new environmentally friendly thermal insulation paper bag according to claim 1 is characterized by: The outer waterproof layer is synthesized or compounded with one or more of acrylic emulsion, liquid biological wax, carboxymethyl chitosan, polydimethylsiloxane, hexadecyl trimethoxysilane and papermaking reinforcing agent as base materials.

7. The novel environmentally friendly heat-insulating paper bag according to claim 6 is characterized by: The papermaking reinforcing agent is a cationic emulsion.

8. The method for making a novel environmentally friendly thermal insulation paper bag according to claim 1, characterized in that: The following steps are involved: A. Apply an outer waterproof layer to the outer surface of the paper surface layer; B. coating a glue layer on the outer surface of the aluminum-plated layer and transferring it to the inner surface of the bubble paper base layer; C. Coating an inner waterproof and oil-proof layer on the inner surface of the aluminum-plated layer; D. Bubble embossing is performed on the composite bubble paper base layer, glue layer, aluminum plating layer, and inner waterproof and oil-proof layer as a whole to form a bubble paper layer; E. Compound the inner surface of the paper surface layer with the outer surface of the bubble paper base layer through the heat-insulating glue layer.

9. The method for making the new environmentally friendly thermal insulation paper bag according to claim 8 is characterized in that: In step A or C, the coating method is printing glazing.

10. The method for making the new environmentally friendly thermal insulation paper bag according to claim 8 is characterized in that: In step E, the composite method is paper mounting.

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