Plastic-film-free packaging paper

Abstract

The utility model discloses plastic-film-free packaging paper which comprises a kraft paper base layer, the bottom surface of the kraft paper base layer is provided with a low-temperature heat-sealing layer, the low-temperature heat-sealing layer is formed by coating a water-based heat-sealing adhesive on the kraft paper base layer, and the surface of the kraft paper base layer is sequentially coated with a pre-coating layer, a printing layer and a protective gloss oil layer. By means of the mode, the packaging paper without the plastic film is endowed with heat sealing performance through the layers, heat sealing can be rapidly conducted under the low-temperature condition, the packaging paper is easy to recycle after being used, the mechanical property of the paper is improved, and the packaging paper can be made into a coiled material to be used for online packaging.

Description

Technical Field

[0001] The utility model relates to a field, in particular to a plastic film-free packaging paper. Background Art

[0002] Paper packaging products are made of pulp and paperboard as the main raw materials, and the raw materials used are plants that can be harvested and recycled. Plastic packaging ultimately consumes oil, which is a non-renewable resource.

[0003] The following problems exist in the application of existing plastic packaging:

[0004] 1: Plastic packaging is difficult to degrade after being discarded, which can easily cause long-term and difficult-to-control environmental problems.

[0005] 2: Discarded plastic packaging mixed with domestic waste is difficult to deal with. Landfill disposal will occupy land for a long time and mix in the soil, affecting the absorption of nutrients and water for crops, making domestic waste unsuitable for composting.

[0006] 3: After discarding, waste plastic packaging will cause long-term and difficult-to-manage environmental problems due to its difficulty in degradation: death of crops and animals, long-term occupation of land by landfill, domestic waste is not suitable for composting and is difficult to recycle, etc. Summary of the invention

[0007] The main technical problem solved by the utility model is to provide a plastic film-free packaging paper, which is endowed with heat-sealing properties through a layer, can be quickly heat-sealed under low temperature conditions and is easy to recycle and reuse after use, thereby improving the mechanical properties of the paper and being able to be made into a coil for online packaging.

[0008] In order to solve the above technical problems, a technical solution adopted by the utility model is: to provide a plastic film-free packaging paper, including a kraft paper base layer, the bottom surface of the kraft paper base layer has a low-temperature heat sealing layer, the low-temperature heat sealing layer is formed by coating an aqueous heat sealing adhesive on the kraft paper base layer, and the surface of the kraft paper base layer is coated with a pre-coating layer, a printing layer and a protective varnish layer in sequence.

[0009] In a preferred embodiment of the present invention, the water-based heat-sealing adhesive is partially coated along the side of the kraft paper base layer to form a low-temperature heat-sealing layer.

[0010] In a preferred embodiment of the present invention, the thickness of the low-temperature heat-sealing layer is 2-7 μm, and the gram weight of the low-temperature heat-sealing layer is 2.5-5 gsm.

[0011] In a preferred embodiment of the present invention, the kraft paper base layer is made of kraft paper with a grammage of 40-150 gsm, and the thickness of the kraft paper base layer is 30-170 μm.

[0012] In a preferred embodiment of the present invention, the protective varnish layer is a water-based varnish layer, a UV varnish layer, a solvent-based varnish layer or an alcohol-soluble varnish layer, and the thickness of the protective varnish layer is 0.5-3 μm.

[0013] In a preferred embodiment of the present invention, the printing layer is a water-based ink printing layer, the gram weight of the printing layer is 1-5 gsm, and the thickness of the printing layer is 2-6 μm.

[0014] In a preferred embodiment of the present invention, the thickness of the pre-coating layer is 3-12 μm.

[0015] The beneficial effects of the utility model are as follows: the plastic film-free packaging paper of the utility model has good heat-sealing performance as a coating of water-based heat-sealing adhesive, which gives the packaging paper heat-sealing performance, can be quickly heat-sealed under low temperature conditions, and the packaging paper is easy to recycle and reuse after use.

[0016] The plastic-free packaging paper of the utility model adopts kraft paper, has better toughness and packaging formability, is highly plastic, is not easy to break, can be made into a coil for online packaging, and widens the process window.

[0017] The utility model provides plastic-free packaging paper, and a pre-coating layer is added to the surface of kraft paper to greatly improve the water-based printing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative work, among which:

[0019] Figure 1 It is a structural schematic diagram of the plastic film-free packaging paper of the utility model;

[0020] Figure 2 yes Figure 1 Bottom view of

[0021] The components in the attached drawings are marked as follows: 1. kraft paper base layer, 2. low-temperature heat sealing layer, 3. pre-coating layer, 4. printing layer, 5. protective varnish layer. DETAILED DESCRIPTION

[0022] The technical scheme in the embodiment of the utility model will be described clearly and completely below. The structure, proportion, size, etc. illustrated in the drawings of this specification are only used to match the content disclosed in the specification, so that people familiar with this technology can understand and read, and are not used to limit the limiting conditions that can be implemented in the utility model, so they have no technical substantive significance. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effect that can be produced by the utility model and the purpose that can be achieved, should still fall within the scope of the technical content disclosed in the utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and so on quoted in this specification are only for the convenience of narration, and are not used to limit the scope that can be implemented. The change or adjustment of its relative relationship should also be regarded as the scope that can be implemented in the utility model without substantially changing the technical content.

[0023] See also Figure 1 and Figure 2 , a plastic film-free packaging paper, comprising a kraft paper base layer 1. The kraft paper base layer 1 is made of 40-150gsm kraft paper, and the thickness of the kraft paper base layer 1 is 30-170μm.

[0024] The bottom surface of the kraft paper base layer 1 has a low-temperature heat-sealing layer 2, and the heat-sealing temperature of the low-temperature heat-sealing layer 2 is 120-150° C. The low-temperature heat-sealing layer 2 is formed by coating the kraft paper base layer 1 with a water-based heat-sealing adhesive. Preferably, a local coating method is adopted, and the water-based heat-sealing adhesive is locally coated along the side of the kraft paper base layer 1 to form the low-temperature heat-sealing layer 2, which can reduce the amount of the water-based heat-sealing adhesive used without affecting the heat-sealing performance.

[0025] The solid content of the water-based heat sealant is 42%, the pH value is 7.5, the viscosity (25°C) is 150mPa·s, and the particle size is 0.7u. The quantitative water-based heat sealant is 3-8g / m 2 The coating speed is 80-150 m / min. The coated kraft paper is dried at a temperature of 50-100°C to obtain a packaging paper coated with a water-based coating, such as Figure 1 The dried wrapping paper has a weight of 77.7 gsm, a moisture content of 6.39%, and a thickness of 75 μm, wherein the thickness of the low-temperature heat-sealing layer 2 is 2-7 μm, and the gram weight is 2.5-5 gsm.

[0026] The surface of the kraft paper base layer 1 is coated with a pre-coating layer 3, a printing layer 4 and a protective varnish layer 5 in sequence. The protective varnish layer 5 is a water-based varnish layer, a UV varnish layer, a solvent-based varnish or an alcohol-soluble varnish layer, and the thickness of the protective varnish layer 5 is 0.5-3 μm. The printing layer 4 is a water-based ink printing layer, and the gram weight of the printing layer 4 is 1-5 gsm. The thickness of the pre-coating layer 3 is 3-12 μm. The pre-coating layer 3, the printing layer 4 and the protective varnish layer 5 are processed using existing materials and processes to finally obtain plastic film-free packaging paper.

[0027] The pre-coat layer is made of existing materials, and a combination of fillers and emulsions is selected. The combination consists of the following components in parts by weight: filler 75-90, dispersant 0.5-1, emulsion 9-25, NaOH 0.01-1, water repellent 0.04-0.8, lubricant 0.1-2, the filler is a combination of talcum powder, porcelain clay, 90-grade calcium carbonate or several thereof. The emulsion is a combination of polyacrylate emulsion, styrene-acrylic emulsion, styrene-butadiene emulsion or several thereof.

[0028] The plastic-free packaging paper is heat-sealed into a bag, has good heat-sealing performance, and can be quickly heat-sealed and formed. The packaging paper has good physical properties and can be folded to form a three-dimensional structure similar to plastic, achieving the effect of a three-dimensional packaging bag, and can accommodate more packaging objects in the packaging bag. Therefore, based on the same amount of paper, the packaging bag of the present application can obtain a larger packaging space.

[0029] Different from the prior art, the plastic film-free packaging paper of the utility model has heat-sealing properties through a layer, can be quickly heat-sealed under low temperature conditions and is easy to recycle and reuse after use, improves the mechanical properties of paper, and can be made into a roll for online packaging.

[0030] The above schematically describes the present invention and its implementation methods, which are not restrictive. The drawings show only one implementation method of the present invention, and the actual structure is not limited thereto. Therefore, if ordinary technicians in this field are inspired by it and design structural methods and embodiments similar to the technical solution without creativity without departing from the purpose of the present invention, they should all fall within the protection scope of the present invention.

Claims

1. A plastic film-free packaging paper, characterized in that: It comprises a kraft paper base layer, the bottom surface of which is provided with a low-temperature heat-sealing layer, which is formed by coating a water-based heat-sealing adhesive on the kraft paper base layer, and the surface of the kraft paper base layer is coated with a pre-coating layer, a printing layer and a protective varnish layer in sequence.

2. The plastic-free film packaging paper according to claim 1, characterized in that: The water-based heat-sealing adhesive is partially coated along the side of the kraft paper base layer to form a low-temperature heat-sealing layer.

3. The plastic-free film packaging paper according to claim 2, characterized in that: The thickness of the low-temperature heat-sealing layer is 2-7 μm, and the gram weight of the low-temperature heat-sealing layer is 2.5-5 gsm.

4. The plastic-free film packaging paper according to claim 1, characterized in that: The kraft paper base layer is made of kraft paper with a grammage of 40-150 gsm, and the thickness of the kraft paper base layer is 30-170 μm.

5. The plastic-free film packaging paper according to claim 1, characterized in that: The protective varnish layer is a water-based varnish layer, a UV varnish layer, a solvent-based varnish layer or an alcohol-soluble varnish layer, and the thickness of the protective varnish layer is 0.5-3 μm.

6. The plastic-free film packaging paper according to claim 1, characterized in that: The printing layer is a water-based ink printing layer, the gram weight of the printing layer is 1-5 gsm, and the thickness of the printing layer is 2-6 μm.

7. The plastic-free film packaging paper according to claim 1, characterized in that: The thickness of the pre-coating layer is 3-12 μm.

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