Paper-plastic container, process for its production and use thereof for containing ready-to-cook food products to be heated in an oven or microwave oven

Abstract

The present invention provides a paper-plastic container, a process method thereof and uses thereof. The paper-plastic container process method comprises providing a main material comprising long fiber pulp and short fiber pulp, performing a pulp spreading step, performing a pulp grinding step, performing an additive adding step, and performing a hot-press forming step. The main material is defibrated and has a sufficient starch gelatinization degree to facilitate the hot-press forming of the paper-plastic container. The additive comprises a special processing process of nanocellulose and / or starch. In this way, a paper-plastic container with heat-resistant oil penetration, controllable low air permeability and sealed foreign matter contamination prevention can be obtained.

Description

Technical Field

[0001] This invention relates to a paper-plastic container, its manufacturing process and its uses, particularly to a paper-plastic container and its manufacturing process that are resistant to hot oil penetration, have controllable low air permeability and are sealable, as well as its use for holding ready-to-eat foods that can be heated in an oven or microwave oven. Background Technology

[0002] As environmental protection becomes increasingly important to countries worldwide, promoting biomass renewable energy, biodegradable and recyclable materials, and reducing the use of plastic products have become common goals for many nations. However, in the food industry, plastic containers remain a frequently used material for food storage. This is because plastic has excellent gas barrier properties, high-temperature oil resistance, heat-sealing capabilities, and water resistance, and is also inexpensive. Currently, there are no other materials besides plastic that meet these requirements, making plastic containers the only microwave-safe ready-to-eat food packaging available on the market.

[0003] While many paper-plastic containers are available for short-term food storage, their gas and oil barrier properties are relatively poor. They also struggle to maintain their oil-proof properties when heated in ovens or microwaves, thus limiting their use in food storage. Convenience stores and supermarkets have high demand for disposable packaging containers for ready-to-eat foods, and due to the complex performance requirements, no one uses paper-plastic products. Furthermore, existing paper-plastic containers cannot be heat-sealed to prevent contamination, making them unsuitable for storing ready-to-eat foods for extended periods. Current improvements involve attaching a plastic film to the paper-plastic container; however, this method still results in a high plastic content, expensive materials, and difficulties in recycling.

[0004] Due to the freshness requirements of ready-to-eat foods, their shelf life is typically 2 to 10 days. Therefore, the packaging design of ready-to-eat foods can move away from the necessity of using metal, glass, plastic, and paper composite barrier packaging materials. Instead, paper-plastic containers can be developed directly from pulp with the addition of small amounts of additives, achieving oil-proof and low-permeability characteristics. This also meets environmental sustainability requirements and solves the current technical problem of not being able to prepare containers for ready-to-eat foods using environmentally friendly materials.

[0005] In conclusion, it is crucial to develop a paper-plastic container and its manufacturing process that is producible, has good gas barrier and oil resistance properties, can be used at high temperatures, and meets environmental protection requirements. Summary of the Invention

[0006] One objective of this invention is to prepare paper-plastic containers for microwave-safe or oven-safe ready-to-eat foods using environmentally friendly or recycled materials that are biodegradable, recyclable, and can replace or reduce plastic consumption. In the paper-plastic container manufacturing process, by adding nano-cellulose and / or starch to the pulp, the paper-plastic containers acquire high-temperature oil resistance and low air permeability. This improves the resistance of current paper-plastic containers to high-heat oil penetration and meets the functional requirements of ready-to-eat food packaging. Consequently, the paper-plastic containers can be used for the holding, preservation, and heating of food or liquids, while simultaneously solving the problem of scalding hot plastic containers. This invention can replace current plastic containers used for ready-to-eat foods and represents a strategy for reducing plastic consumption through disposable plastic containers.

[0007] One aspect of the present invention provides a paper-plastic container manufacturing process, comprising providing a main material, performing a pulping step, performing a refining step, performing an additive addition step, performing a pre-starch gelatinization step, and performing a thermoforming step. The main material comprises a long-fiber pulp and a short-fiber pulp, wherein, based on 100% by weight of the main material, the long-fiber pulp comprises 1% to 99% by weight. The pulping step involves uniformly dispersing the main material in water to form a pulp aqueous solution. The refining step involves mechanically fusing the pulp aqueous solution to form a fusing pulp, wherein the fusing pulp has a freeness of 300 to 600. The additive addition step involves adding an additive to the fusing pulp and mixing to form a paper-plastic pulp, wherein the additive comprises a starch or a nanocellulose and a starch, and based on 100% by weight of the main material, the amount of nanocellulose added is 0.1% to 30% by weight, and the amount of starch added is 1% to 50% by weight. The pre-starch gelatinization step involves preheating the paper-plastic pulp at a temperature above 100°C for at least 1 second to obtain a pre-starch gelatinized paper-plastic pulp. The hot-pressing step involves hot-pressing the pre-starch gelatinized paper-plastic pulp at a temperature above 100°C for at least 10 seconds to perform a gelatinization reaction and shape it into a paper-plastic container. The additives also include an inorganic substance and / or a polymer, and the polymer does not contain nanocellulose and starch. The polymer includes polybutylene adipate terephthalate, polybutylene succinate copolymer, polycaprolactone, polyvinyl alcohol, polylactic acid, polyglycolic acid, polyhydroxyalkanoates, succinate, cellulose derivatives, animal glue, plant glue, chitin, protein, polyolefin fiber, maleic anhydride polymer, polyurethane, polyvinyl furanoate, waterborne acrylic, alkyl ketone dimer, polyaluminum chloride, or mixtures thereof.

[0008] According to the paper-plastic container process method of the foregoing embodiments, the nanocellulose can be nanofiber cellulose, nanocellulose crystals or bacterial nanocellulose, and the starch can be natural starch or modified starch.

[0009] According to the paper-plastic container process described in the foregoing embodiments, the inorganic materials may include calcium carbonate, bentonite, shell powder, calcium silicate, kaolin, mica, borax, diatomaceous earth, apatite, talc, titanium dioxide, aluminum compounds, and mixtures thereof.

[0010] According to the paper-plastic container process method of the aforementioned embodiments, the amount of inorganic matter added can be from 1% to 10% by weight, and the amount of polymer added can be from 0.1% to 20% by weight, based on the main material being 100% by weight.

[0011] The paper-plastic container process according to the foregoing embodiments may further include a coating step, which involves coating a first coating agent and / or a second coating agent onto the surface of the paper-plastic container.

[0012] According to the paper-plastic container process described in the foregoing embodiments, the first coating agent and the second coating agent may respectively comprise calcium carbonate, bentonite, shell powder, calcium silicate, kaolin, mica, borax, diatomaceous earth, apatite, talc, titanium dioxide, aluminum compounds, polybutylene adipate terephthalate, polybutylene succinate copolymer, polycaprolactone, polyvinyl alcohol, polylactic acid, polyglycolic acid, polyhydroxyalkanoate, succinate, starch, cellulose, cellulose derivatives, animal glue, plant glue, chitin, protein, polyolefin fiber, maleic anhydride polymer, polyurethane, polyvinyl furanoate, water-based acrylic, alkyl ketone dimer, polyaluminum chloride, or mixtures thereof, and the first coating agent and the second coating agent may be the same or different.

[0013] According to the paper-plastic container process method of the aforementioned embodiments, based on the main material being 100% by weight, the coating amount of the first coating agent can be from 0.1% by weight to 40% by weight, and the coating amount of the second coating agent can be from 0.1% by weight to 40% by weight.

[0014] Therefore, the paper-plastic container process of the present invention uses nanocellulose and / or starch as the main additives to produce paper-plastic containers with high temperature oil resistance, low air permeability, sealability and easy opening characteristics.

[0015] Another aspect of the present invention provides a paper-plastic container, which is manufactured by the aforementioned paper-plastic container process, wherein the quantitative gas permeability test time of the paper-plastic container is increased by more than 20%.

[0016] According to the aforementioned embodiments, the paper-plastic container may be sealable and easy to open, and the easy-to-open pull force value is 50 grams to 1200 grams.

[0017] The paper-plastic container according to the foregoing embodiments may have high-temperature oil resistance.

[0018] Therefore, the paper-plastic container of the present invention can be used to hold ready-to-eat foods and can be refrigerated or frozen and / or heated in a microwave oven or oven.

[0019] Another aspect of the present invention provides the use of a paper-plastic container for holding a ready-to-eat food that is refrigerated or frozen and / or heated in a microwave oven or oven. Attached Figure Description

[0020] To make the above and other objects, features, advantages and embodiments of the present invention more apparent and understandable, the accompanying drawings are described below: Figure 1 A flowchart illustrating the steps of a paper-plastic container manufacturing process according to an embodiment of the present invention; and Figure 2 A flowchart illustrating the steps of a paper-plastic container manufacturing process according to another embodiment of the present invention is shown.

[0021] [Symbol Explanation]

[0022] 100,200: Paper-Plastic Container Manufacturing Process

[0023] 110, 120, 130, 140, 150, 210, 220, 230, 240, 250, 260, 270: Steps Detailed Implementation

[0024] Several embodiments of the present invention will now be described with reference to the accompanying drawings. For clarity, many practical details will be set forth in the following description. However, it should be understood that these practical details are not intended to limit the invention. That is, in some embodiments of the invention, these practical details are not essential. Furthermore, for the sake of simplicity in the drawings, some conventional structures and elements will be illustrated in a simple schematic manner; and repeated elements may be denoted by the same reference numerals.

[0025] Please refer to 1. Figure 1 The diagram illustrates a flowchart of the steps of a paper-plastic container manufacturing method 100 according to an embodiment of the present invention. The paper-plastic container manufacturing method 100 includes steps 110, 120, 130, 140, and 150.

[0026] Step 110 involves providing a main material, specifically comprising a long-fiber pulp and a short-fiber pulp, wherein the main material comprises 100% by weight, and the long-fiber pulp comprises 1% to 99% by weight, preferably 10% to 50% by weight. Generally, the long-fiber pulp primarily affects the tensile strength of the product, while the short-fiber pulp primarily affects the uniformity of the product. Therefore, the desired product properties can be obtained by adjusting the ratio of long-fiber pulp to short-fiber pulp in the main material.

[0027] Step 120 is a pulping step, which involves evenly distributing the main material in water to form a pulp solution.

[0028] Step 130 involves a refining step, in which the pulp aqueous solution is mechanically fracturized to form fracturized pulp. Specifically, fracturization refers to the formation of fuzz, tearing, and filamentation of the cell walls of the fibers in the pulp aqueous solution, thereby giving the pulp aqueous solution softness and plasticity, and improving the bonding strength between fibers. In particular, the pulp aqueous solution may be refined multiple times in step 130 to achieve a freeness of the fracturized pulp between 300 and 600, but this invention is not limited to this.

[0029] More specifically, the degree of freeness can be used to determine the filtration performance of pulp, and the degree of freeness is related to the degree of pulp refining. Therefore, the paper-plastic container process method 100 of the present invention can adjust the filtration performance of the pulp by refining the pulp aqueous solution multiple times to increase the degree of freeness to the required range.

[0030] Step 140 involves adding an additive, which is done by directly adding a small amount of additive to the pulp and mixing it to form a paper-plastic pulp. This paper-plastic pulp is low-cost and meets the requirements for mass production. The additive includes nanocellulose and / or starch, and based on a 100% weight percentage of the main material, the amount of nanocellulose added is 0.1% to 30% by weight, and the amount of starch added is 1% to 50% by weight. Specifically, the nanocellulose possesses high mechanical strength, modifiable surface chemistry, crystallinity, barrier properties, and biodegradability. It can be nanocellulose fiber (NCF), cellulose nanocrystal (CNC), or bacterial nanocellulose (BNC). The starch can be natural starch or modified starch, and the modified starch can be modified starch, cationic starch, or amphoteric starch. The degree of starch gelatinization can be subsequently controlled to achieve high-temperature oil resistance and gas barrier properties.

[0031] Furthermore, the degree of starch gelatinization and the amount of starch and carbon nanofibers added are limited and cannot be excessive. Therefore, depending on the required performance and strength of the paper-plastic container, such as reducing air permeability, improving sealability and ease of opening, or high-temperature oil resistance, the additives may also include an inorganic substance and / or a polymer. Oil-resistant agents such as MF300 may also be added. The inorganic substance may include calcium carbonate, bentonite, montmorillonite, shell powder (e.g., antibacterial shell powder), calcium silicate, kaolin, mica, borax, diatomaceous earth, apatite, talc, titanium dioxide, aluminum compounds (e.g., aluminum sulfate, aluminum oxide, etc.), and mixtures thereof.The polymer does not contain nanocellulose and starch, and can be a biodegradable or non-biodegradable polymer. Biodegradable polymers include oil-based synthetic polymers, biomass-based synthetic polymers, microbial fermentation polymers, and natural polymers. More specifically, the polymer may contain polybutylene adipate-co-terephthalate (PBAT), polybutylene succinate (PBS), polybutylene succinate adipate (PBSA), polycaprolactone (PCL), polyvinyl alcohol (PVA), polylactic acid (PLA), polyglycolic acid (PGA), polyhydroxyoctanoate (PHO), polyhydroxyalkanoates (PHA), and polyhydroxybutyrate (PHB). PHB), 3-hydroxybutyrate-co-3-hydroxyvalerate (PHBV), p-hydroxybenzoic acid (PHBH), saccharin, cellulose derivatives (e.g., carboxymethyl cellulose, methyl cellulose, hydroxypropyl cellulose, ethyl cellulose, or derived from brewer's lees or bagasse), animal glue (e.g., gelatin), plant gums (e.g., pectin, carrageenan gum, locust bean gum, seaweed gum, rosin), chitin (e.g., chitosan), proteins (e.g., whey protein, casein, albumin, soy protein lysate), polyolefin fibers, maleic anhydride polymers, polyurethane (PU), wax paste, poly(ethylene 2,5-furanoate) (PEF), waterborne acrylic, alkyl ketene dimer (AKD), polyaluminum chloride (PAC), or mixtures thereof. Furthermore, based on a main ingredient of 100% by weight, the amount of polymer added can be from 0.1% to 20% by weight, and the amount of inorganic matter added can be from 1% to 10% by weight.

[0032] In detail, the aforementioned additives are all dense or fine-particle materials. Therefore, paper-plastic containers made from paper-plastic pulp containing the aforementioned additives have high-temperature oil resistance and low air permeability. This is because the gaps in the paper-plastic container that would normally allow gas and grease to pass through are blocked by the fine particles of the aforementioned additives, causing a "bypass effect" when gas or grease passes through the paper-plastic container. That is, gas or grease needs to take a longer path to penetrate the paper-plastic container. Furthermore, adhesives can also be used as binders for pulp fibers to increase strength, which can reduce the cost of pulp raw materials. Therefore, the paper-plastic container produced by the paper-plastic container process 100 of the present invention can have excellent gas and oil barrier effects.

[0033] Step 150 involves a thermoforming step, in which the paper-plastic pulp is thermoformed to form a paper-plastic container. More specifically, this invention is not limited to the appearance or structural design of the paper-plastic container, as long as its structure can effectively prevent gas and oil from entering the container for holding food or liquids.

[0034] Please refer to Figure 2 This is a flowchart illustrating the steps of a paper-plastic container manufacturing method 200 according to another embodiment of the present invention. The paper-plastic container manufacturing method 200 includes steps 210, 220, 230, 240, 250, 260, and 270, wherein steps 210, 220, 230, and 240 are... Figure 1 Steps 110, 120, 130 and 140 of the paper-plastic container process method 100 are the same, so they will not be described again here.

[0035] Step 250 is a pre-starch gelatinization step, which involves preheating the paper-plastic pulp obtained from steps 210 to 240 at a temperature above 100°C for more than 1 second to obtain a pre-starch gelatinized paper-plastic pulp. The moisture content of the pre-starch gelatinized paper-plastic pulp after step 250 is about 50% to 90%. This is a key technology that affects the degree and speed of complete starch gelatinization, but does not affect the needs of mass production. The preheating time and temperature will vary depending on the machinery.

[0036] Step 260 is a hot pressing molding step, in which the pre-starch gelatinized paper-plastic pulp is hot-pressed at above 100°C for more than 10 seconds to gelatinize and solidify, so as to obtain a paper-plastic container. After solidification, it can be further dried. The moisture content of the paper-plastic container after complete gelatinization in step 260 is about 5%~10%.

[0037] Step 270 is a coating step, which involves applying a first coating agent and / or a second coating agent to the surface of the paper-plastic container. In detail, the first coating agent and the second coating agent respectively comprise calcium carbonate, bentonite, montmorillonite, shell powder (e.g., antibacterial shell powder), calcium silicate, kaolin, mica, borax, diatomaceous earth, apatite, talc, titanium dioxide, aluminum compounds (e.g., aluminum sulfate, aluminum oxide, etc.), polybutylene adipate, polybutylene succinate, polybutylene succinate copolymer, polyhydroxyoctanoate, polycaprolactone, polyvinyl alcohol, polylactic acid, polyglycolic acid, polyhydroxyalkanoate, polyhydroxybutyrate, 3-hydroxybutyrate-co-3-hydroxyvalerate copolymer, p-hydroxybenzoyl hydrazine, succinate, starch, cellulose, cellulose derivatives, animal glue, plant glue, chitin, protein, polyolefin fiber, maleic anhydride polymer, polyurethane, wax paste, polyvinyl furanoate, water-based acrylic, alkyl ketone dimer, polyaluminum chloride, or mixtures thereof, and the first coating agent and the second coating agent may be the same or different. Based on a main material of 100% by weight, the coating amount of the first coating agent can be from 0.1% to 40% by weight, and the coating amount of the second coating agent can be from 0.1% to 40% by weight.

[0038] Specifically, the first coating agent and the second coating agent have a dense structure after drying, so that gas or liquid cannot easily penetrate the coating formed by the first coating agent and / or the second coating agent, thereby further enhancing the gas barrier and oil barrier effect of the paper-plastic container.

[0039] Another aspect of the present invention provides a paper-plastic container, which is manufactured by the aforementioned paper-plastic container process 100 or 200. The additives block the micropores of the paper-plastic container, thereby increasing the test time for metered gas permeability by more than 20%. Preferably, when the additives in the additive addition step also include polymers and / or inorganic substances, the bypass effect causes the additives to block the micropores of the paper-plastic container, thereby increasing the test time for metered gas permeability by more than 1.5 times. More preferably, when the paper-plastic container process includes a coating step, the resulting paper-plastic container has a coating layer that blocks the micropores of the paper-plastic container, thereby increasing the test time for metered gas permeability by more than 32 times.

[0040] Specifically, please refer to Table 1 below for the different characteristic requirements that can be achieved by preparing the paper-plastic container of the present invention using different formulations and / or processes. ◎ indicates excellent results, ○ indicates good results, Δ indicates acceptable results, and × indicates poor results. Comparative Example 1 is a paper-plastic container without additives, Comparative Example 2 is a non-paper-plastic cardboard folding container, and Comparative Example 3 is a plastic container as a control.

[0041] Table 1

[0042] As can be seen from the comparison results in Table 1, the paper-plastic container produced by the paper-plastic container process of the present invention is high-temperature oil resistant, low air permeability, and has sealing and easy-to-open properties. Therefore, it can be used to hold ready-to-eat foods, which can be refrigerated or frozen and / or reheated in a microwave oven or oven. The paper-plastic container process of the present invention incorporates special additives that improve the strength and toughness of the paper-plastic container, thus it can be used to prepare paper cups and / or paper cup lids, preventing leakage due to deformation during opening and closing. Furthermore, because conventional paper containers often leak hot soup or oily liquids, food delivery typically uses plastic bags. However, most plastic bags contain plasticizers and are unsuitable for holding hot liquids. The paper-plastic container of the present invention is particularly suitable for holding foods containing hot soup or oil, eliminating the need for plastic bags and providing an environmentally friendly, safe, and hygienic solution.

[0043] [Experimental Example]

[0044] To achieve different performance requirements, the paper-plastic containers of the present invention were prepared using different formulations and / or processes in the following test examples, with conventional paper-plastic containers used as comparative examples. Please refer to Table 2 below for the additive composition of each test example and comparative example of the paper-plastic containers of the present invention. Furthermore, based on a main material composition of 100% by weight, the main material used in each of the following test examples contains 30% by weight of long-fiber pulp and 70% by weight of short-fiber pulp to avoid affecting the test results due to differences in the main material composition between test examples.

[0045] Table 2

[0046] The experiments further examined the above-mentioned test examples and comparative examples, conducting oil resistance tests, quantitative gas permeability tests, and easy-open tensile strength tests. The oil resistance test was performed according to the TAPPI 557 standard test kit values ​​and the Alliance Company method for testing oil temperature penetration resistance. The quantitative gas permeability test was conducted using a Gurley permeability meter according to ASTM D726 and GB / T458. The easy-open tensile strength test was measured according to the ASTM D882 method. Please refer to Table 3 below for the results of the above tests performed on the test examples and comparative examples.

[0047] Table 3

[0048] As shown in Table 3, the high-temperature oil resistance test results indicate that oil temperatures exceeding 80°C will not penetrate the paper-plastic container of this invention. This demonstrates that the paper-plastic containers produced by the process of this invention exhibit superior high-temperature oil resistance and can be used for holding hot food or for heating the food in a microwave oven or oven. Furthermore, the quantitative gas permeability test times of the paper-plastic containers in the test examples with added additives are all higher than those of the paper-plastic container in Comparative Example 1, proving that the paper-plastic containers produced by the process of this invention have better gas barrier properties, thereby maintaining the flavor of the packaged contents. Moreover, the paper-plastic containers produced by the process of this invention are both sealable and easy to open, providing a sealable packaging solution to prevent contamination of the packaged contents by foreign objects, bacteria, etc.

[0049] In summary, the paper-plastic container process of the present invention, by adding nanocellulose and / or starch to the pulp, or further adding inorganic substances and / or polymers that do not contain nanocellulose and starch, enables the paper-plastic container of the present invention to have excellent gas and oil barrier effects, making it suitable as a container for holding and preserving food or liquids, and suitable for heating in a microwave oven or oven. Compared with conventional paper-plastic containers, it has a wider range of applications.

[0050] Although the present invention has been disclosed above by way of embodiments, it is not intended to limit the present invention. Any person skilled in the art can make various modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A paper-plastic container manufacturing process, characterized in that, Include: A main material is provided, which comprises a long-fiber pulp and a short-fiber pulp, wherein the long-fiber pulp is 1 to 99% by weight, based on the main material being 100% by weight. A pulping step is performed, in which the main material is evenly dispersed in water to form a pulp aqueous solution; A pulping step is performed to mechanically fuss the pulp aqueous solution to form a fuss pulp, wherein the degree of freedom of the fuss pulp is 300 to 600. An additive addition step is performed, in which an additive is added to the pulp and mixed to form a paper-plastic pulp, wherein the additive comprises a starch or a nanocellulose and a starch, and the additive also comprises an inorganic substance and / or a polymer, wherein the polymer does not contain the nanocellulose and the starch, and the polymer comprises polybutylene terephthalate, polybutylene succinate copolymer, polycaprolactone, polyvinyl alcohol, polylactic acid, polyglycolic acid, polyhydroxyalkanoate, succinate, cellulose derivatives, animal glue, plant glue, chitin, protein, polyolefin fiber, maleic anhydride polymer, polyurethane, polyvinyl furanoate, waterborne acrylic, alkyl ketone dimer, polyaluminum chloride or mixtures thereof, and based on the main material being 100% by weight, the amount of nanocellulose added is 0.1% to 30% by weight, and the amount of starch added is 1% to 50% by weight; A pre-starch gelatinization step is performed, wherein the paper-plastic pulp is preheated at a temperature greater than 100°C for more than 1 second to obtain a pre-starch gelatinized paper-plastic pulp; and A hot pressing molding step is performed, in which the pre-starch gelatinized paper-plastic pulp is hot-pressed at above 100°C for more than 10 seconds to gelatinize and solidify, forming a paper-plastic container.

2. The paper-plastic container manufacturing process as described in claim 1, characterized in that, The nanocellulose is a nanofiber cellulose, a nanocellulose crystal, or a bacterial nanocellulose, and the starch is a natural starch or a modified starch.

3. The paper-plastic container manufacturing process as described in claim 1, characterized in that, The inorganic material includes calcium carbonate, bentonite, shell powder, calcium silicate, kaolin, mica, borax, diatomite, apatite, talc, titanium dioxide, aluminum compounds, and mixtures thereof.

4. The paper-plastic container manufacturing process as described in claim 3, characterized in that, Based on the main ingredient being 100% by weight, the amount of inorganic material added is 1% to 10% by weight, and the amount of polymer added is 0.1% to 20% by weight.

5. The paper-plastic container manufacturing process as described in claim 1, characterized in that, Also includes: A coating step involves applying a first coating agent and / or a second coating agent to the surface of the paper-plastic container.

6. The paper-plastic container manufacturing process as described in claim 5, characterized in that, The first coating agent and the second coating agent respectively comprise calcium carbonate, bentonite, shell powder, calcium silicate, kaolin, mica, borax, diatomaceous earth, apatite, talc, titanium dioxide, aluminum compounds, polybutylene adipate terephthalate, polybutylene succinate copolymer, polycaprolactone, polyvinyl alcohol, polylactic acid, polyglycolic acid, polyhydroxyalkanoate, succinate, starch, cellulose, cellulose derivatives, animal glue, plant glue, chitin, protein, polyolefin fiber, maleic anhydride polymer, polyurethane, polyvinyl furanoate, waterborne acrylic, alkyl ketone dimer, polyaluminum chloride, or mixtures thereof, and the first coating agent and the second coating agent may be the same or different.

7. The paper-plastic container manufacturing process as described in claim 5, characterized in that, Based on the main ingredient being 100% by weight, the coating amount of the first coating agent is from 0.1% to 40% by weight, and the coating amount of the second coating agent is from 0.1% to 40% by weight.

8. A paper-plastic container, characterized in that, The paper-plastic container is manufactured by any one of the paper-plastic container process methods according to claims 1 to 7, wherein the quantitative gas permeability test time of the paper-plastic container is increased by more than 20%.

9. The paper-plastic container as described in claim 8, characterized in that, The paper-plastic container is both sealable and easy to open, with an easy-open pull strength of 50 grams to 1200 grams.

10. The paper-plastic container as described in claim 8, characterized in that, This paper-plastic container has high-temperature oil resistance.

11. The use of the paper-plastic container as described in claim 8, characterized in that, Used to hold a ready-to-eat food that is refrigerated or frozen and / or heated in a microwave or oven.

Images