Degradable composite film for tableware packaging

Abstract

The utility model discloses a degradable composite film for tableware packaging. The degradable composite film is sequentially provided with a matte coating, a PLA (polylactic acid) layer, a printing layer, a bonding layer, a paper layer, a bonding layer and a heat sealing layer from outside to inside, the PLA layer is composed of a first PLA heat-sealing layer, a PLA core layer and a second PLA heat-sealing layer, and the first PLA heat-sealing layer, the PLA core layer and the second PLA heat-sealing layer are all double-sided heat-sealing two-way stretching polylactic acid films. The thickness and performance of each layer of the film are optimized, the thickness of the matte coating is 0.5-2 mu m, the thickness of the PLA layer is 10-30 mu m, the thicknesses of the first PLA heat sealing layer and the second PLA heat sealing layer are 1-5 mu m, the corona value is larger than or equal to 36 dyn, the thickness of the printing layer is 0.1-1 mu m, the thickness of the bonding layer is 0.5-2 mu m, the weight of the paper layer is 10-500 g / m < 2 >, and the heat sealing layer is a PBAT film with the thickness of 10-60 mu m. The degradable composite film has degradability, oil and water resistance, heat sealability and reusability, the production cost is reduced, meanwhile, the product grade is improved, the requirement of the catering industry for environment-friendly packaging is met, and the degradable composite film has wide market application prospects.

Description

Technical Field

[0001] This utility model belongs to the field of film packaging technology, specifically relating to a biodegradable composite film for tableware packaging. Background Technology

[0002] With the booming development of the catering industry, the use of disposable tableware has increased dramatically, leading to increasingly prominent environmental pollution problems. Traditional disposable tableware packaging materials, such as polyethylene (PE) and polypropylene (PP), although possessing certain oil and water resistance, are non-biodegradable. Once stained with oil, they are difficult to clean and must be discarded, resulting not only in resource waste but also serious environmental pollution.

[0003] In recent years, polylactic acid (PLA), as a bio-based biodegradable polymer material, has received widespread attention. PLA is made from renewable plant resources (such as corn starch) through fermentation and polymerization reactions, exhibiting good biocompatibility and biodegradability. Its final degradation products are water and carbon dioxide, causing no secondary pollution to the environment. Furthermore, PLA possesses good water and oil repellency, allowing direct contact with acidic and oily foods, and is easy to clean after contact with oil. These characteristics make it one of the most promising polymers to replace traditional plastics. However, PLA also has some limitations. For example, PLA has poor flexibility and heat-sealing properties, which may reduce the customer experience when used alone and pose a risk of packaging breakage. In addition, the production process of PLA requires large quantities of grain crops such as corn, and the supply of these resources may be affected by harvest conditions and fluctuations in the international market. In practical applications, the degradation rate of PLA is also limited by environmental conditions, such as temperature, humidity, and microbial activity. While paper-based materials are biodegradable and have a good texture, their poor oil and water repellency makes them unsuitable for disposable tableware packaging. While polybutylene adipate terephthalate (PBAT) film has good heat-sealing and degradation properties, its high haze and poor printability limit its application in the packaging field.

[0004] In conclusion, developing a high-quality tableware packaging material that combines biodegradability, oil and water resistance, heat sealing, and reusability is of great practical significance for solving the environmental pollution problems caused by current disposable tableware packaging and meeting the market's demand for environmentally friendly packaging. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a biodegradable composite film for tableware packaging, which solves the problems of traditional disposable tableware packaging materials being non-degradable, difficult to clean once stained with oil, and having to be discarded, resulting in resource waste and environmental pollution.

[0006] The technical solution adopted by this utility model to solve its technical problem is: a biodegradable composite film for tableware packaging, which is provided with a matte coating, a PLA layer, a printing layer, an adhesive layer, a paper layer, an adhesive layer and a heat-sealing layer in sequence from the outside to the inside; the PLA layer is composed of a first PLA heat-sealing layer, a PLA core layer and a second PLA heat-sealing layer, and the first PLA heat-sealing layer, the PLA core layer and the second PLA heat-sealing layer are all double-sided heat-sealed biaxially oriented polylactic acid films.

[0007] In a preferred embodiment of this utility model, the matte coating is applied to the outer surface of the first PLA heat-sealing layer by a matte paint coating method, and the thickness of the matte coating is 0.5-2μm.

[0008] In a preferred embodiment of this utility model, the thickness of the PLA layer is 10-30 μm.

[0009] In a preferred embodiment of this utility model, the thickness of both the first PLA heat-sealing layer and the second PLA heat-sealing layer is 1-5 μm.

[0010] In a preferred embodiment of this utility model, the corona value of the first PLA heat-sealing layer and the second PLA heat-sealing layer is ≥36dyn.

[0011] In a preferred embodiment of this utility model, the printing layer is water-based ink, and the thickness of the printing layer is 0.1-1μm.

[0012] In a preferred embodiment of this utility model, the adhesive layer is a polyurethane adhesive layer, and the thickness of the adhesive layer is 0.5-2μm.

[0013] In a preferred embodiment of this utility model, the paper layer is kraft paper, and the weight of the paper layer is 10-500g / m³. 2 .

[0014] In a preferred embodiment of this utility model, the heat-sealing layer is a PBAT film prepared by blown film or casting process, with a thickness of 10-60μm.

[0015] Compared with the prior art, this technical solution has the following advantages:

[0016] 1. This utility model uses PLA layer and PBAT heat-sealing layer, both of which are biodegradable materials, effectively solving the problem of traditional disposable tableware packaging materials being non-degradable and causing long-term environmental pollution; the composite film is reusable, and unopened tableware can be reused, avoiding a large amount of waste generated due to single use, saving resources and reducing resource consumption;

[0017] 2. The PLA layer of this utility model has excellent waterproof and oil-proof properties, which can effectively prevent tableware from being penetrated by oil and water during the packaging process, keep the tableware clean and dry, extend the shelf life of the tableware, and also facilitate the reuse of tableware; the heat-sealing layer uses PBAT film, which has excellent heat-sealing performance, can ensure the airtightness of the packaging, prevent the tableware from being contaminated by the outside world during transportation and storage, improve the reliability of the packaging, reduce the risk of package breakage, and ensure the hygiene and safety of the tableware;

[0018] 3. This utility model has a matte coating, which gives the film a good tactile feel and visual effect, enhances the product's grade and aesthetics, and meets the market's demand for high-quality packaging materials;

[0019] 4. By rationally selecting and optimizing the thickness of each layer of material, this utility model achieves the thinnest possible composite film while ensuring excellent film performance, thereby reducing production costs. This composite film is particularly suitable for tableware packaging, meeting the various requirements of the catering industry for disposable tableware packaging, and has broad market application prospects, replacing traditional disposable tableware packaging materials. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] Figure 1 This is a schematic diagram of the layer structure of the biodegradable composite film for tableware packaging according to this utility model.

[0022] Among them, 10-matte coating, 20-PLA layer, 21-first PLA heat-sealing layer, 22-PLA core layer, 23-second PLA heat-sealing layer, 30-printing layer, 40-adhesive layer, 50-paper layer, 60-adhesive layer, and 70-heat-sealing layer. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be further described below in conjunction with the accompanying drawings and embodiments. These embodiments may take different forms and should not be construed as limited to the description herein. Throughout the document, the same reference numerals always represent the same elements, and similar reference numerals represent similar elements.

[0024] It should be noted that the terms "inner" refer to the side in contact with the contents, and "outer" refer to the side away from the contents, and should not be construed as a limitation on this utility model.

[0025] A biodegradable composite film for tableware packaging comprises, from the outside to the inside, a matte coating 10, a PLA layer 20, a printing layer 30, an adhesive layer 40, a paper layer 50, an adhesive layer 60, and a heat-sealing layer 70. The PLA layer 20 consists of a first PLA heat-sealing layer 21, a PLA core layer 22, and a second PLA heat-sealing layer 23, all of which are double-sided heat-sealed biaxially oriented polylactic acid (PLA) films. The matte coating 10 is applied to the outer surface of the first PLA heat-sealing layer 21 using a matte coating method, and the thickness of the matte coating 10 is 0.5-2 μm. The thickness of the PLA layer 20 is 10-30 μm. The thickness of both the first PLA heat-sealing layer 21 and the second PLA heat-sealing layer 23 is 1-5 μm. The corona discharge values ​​of the first PLA heat-sealing layer 21 and the second PLA heat-sealing layer 23 are ≥36 dyn. The printing layer 30 is made of water-based ink, and its thickness is 0.1-1 μm. The adhesive layer is a polyurethane adhesive layer, and its thickness is 0.5-2 μm. The paper layer 50 is kraft paper, and its weight is 10-500 g / m³. 2 The heat-sealing layer 70 is a PBAT film prepared by blown film or casting process, with a thickness of 10-60 μm. This film offers high cost-effectiveness, achieving a high-quality feel by minimizing the thickness of the composite film while maintaining biodegradability, oil and water resistance, heat sealing properties, and reusability, thus reducing production costs and making it more economical and practical, meeting market demands.

[0026] Example 1

[0027] A biodegradable composite film for tableware packaging, such as Figure 1 As shown, from the outside to the inside, a matte coating 10, a PLA layer 20, a printing layer 30, an adhesive layer 40, a paper layer 50, an adhesive layer 60, and a heat-sealing layer 70 are sequentially arranged. The PLA layer 20 consists of a first PLA heat-sealing layer 21, a PLA core layer 22, and a second PLA heat-sealing layer 23. The first PLA heat-sealing layer 21, the PLA core layer 22, and the second PLA heat-sealing layer 23 are all double-sided heat-sealed biaxially oriented polylactic acid (PLA) films. The matte coating 10 is a matte polyurethane coating applied to the outer surface of the first PLA heat-sealing layer 21 by roller coating. The heat-sealing layer 70 is a PBAT film prepared by blown film process.

[0028] The PLA layer 20 has a thickness of 25 μm, the first PLA heat-sealing layer 21 and the second PLA heat-sealing layer 23 both have a thickness of 3 μm, the corona discharge values ​​of the first PLA heat-sealing layer 21 and the second PLA heat-sealing layer 23 are 41 dyn, the printing layer 30 has a thickness of 1 μm, the adhesive layers 40 and 60 both have a thickness of 1.5 μm, and the paper layer 50 has a weight of 300 g / m². 2The heat-sealing layer 70 is 30μm thick, the printing layer 30 is water-based ink, the adhesive layers 40 and 60 are both polyurethane adhesive layers, and the paper layer 50 is kraft paper.

[0029] Example 2

[0030] A biodegradable composite film for tableware packaging, such as Figure 1 As shown, from the outside to the inside, a matte coating 10, a PLA layer 20, a printing layer 30, an adhesive layer 40, a paper layer 50, an adhesive layer 60, and a heat-sealing layer 70 are sequentially arranged. The PLA layer 20 is composed of a first PLA heat-sealing layer 21, a PLA core layer 22, and a second PLA heat-sealing layer 23. The first PLA heat-sealing layer 21, the PLA core layer 22, and the second PLA heat-sealing layer 23 are all double-sided heat-sealed biaxially oriented polylactic acid films. The matte coating 10 is a matte polyurethane matte coating applied to the outer surface of the first PLA heat-sealing layer 21 by roller coating. The heat-sealing layer 70 is a PBAT film prepared by a casting process.

[0031] The PLA layer 20 has a thickness of 15 μm, the first PLA heat-sealing layer 21 and the second PLA heat-sealing layer 23 both have a thickness of 1.5 μm, the corona discharge values ​​of the first PLA heat-sealing layer 21 and the second PLA heat-sealing layer 23 are 36 dyn, the printing layer 30 has a thickness of 0.5 μm, the adhesive layers 40 and 60 both have a thickness of 1 μm, and the paper layer 50 has a weight of 100 g / m³. 2 The heat-sealing layer 70 is 20μm thick, the printing layer 30 is water-based ink, the adhesive layers 40 and 60 are both polyurethane adhesive layers, and the paper layer 50 is kraft paper.

[0032] The biodegradable composite film for tableware packaging of this utility model is of great significance as a high-quality tableware packaging material that combines biodegradability, oil and water resistance, heat sealing, and reusability. It solves the problems of traditional disposable tableware packaging materials, which are non-biodegradable and difficult to clean once stained with oil, resulting in waste of resources and environmental pollution.

[0033] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A biodegradable composite film for tableware packaging, characterized in that, From the outside to the inside, the material is provided with a matte coating, a PLA layer, a printing layer, an adhesive layer, a paper layer, an adhesive layer, and a heat-sealing layer. The PLA layer consists of a first PLA heat-sealing layer, a PLA core layer, and a second PLA heat-sealing layer. The first PLA heat-sealing layer, the PLA core layer, and the second PLA heat-sealing layer are all double-sided heat-sealed biaxially oriented polylactic acid films.

2. The biodegradable composite film for tableware packaging as described in claim 1, characterized in that, The matte coating is applied to the outer surface of the first PLA heat-sealing layer by means of matte paint.

3. The biodegradable composite film for tableware packaging as described in claim 1, characterized in that, The thickness of the matte coating is 0.5-2 μm.

4. The biodegradable composite film for tableware packaging as described in claim 1, characterized in that, The thickness of the PLA layer is 10-30 μm.

5. The biodegradable composite film for tableware packaging as described in claim 1, characterized in that, The thickness of both the first PLA heat-sealing layer and the second PLA heat-sealing layer is 1-5 μm.

6. The biodegradable composite film for tableware packaging as described in claim 1, characterized in that, The corona values ​​of the first PLA heat-sealing layer and the second PLA heat-sealing layer are ≥36dyn.

7. The biodegradable composite film for tableware packaging as described in claim 1, characterized in that, The printing layer is made of water-based ink, and the thickness of the printing layer is 0.1-1μm.

8. The biodegradable composite film for tableware packaging as described in claim 1, characterized in that, The adhesive layer is a polyurethane adhesive layer, and the thickness of the adhesive layer is 0.5-2μm.

9. The biodegradable composite film for tableware packaging as described in claim 1, characterized in that, The paper layer is kraft paper, and the weight of the paper layer is 10-500g / m³. 2 .

10. The biodegradable composite film for tableware packaging as described in claim 1, characterized in that, The heat-sealing layer is a PBAT film prepared by blown film or casting process, with a thickness of 10-60 μm.

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