Manufacturing method for pulp molded containers

Abstract

To provide a pulp molded container that can prevent penetration of hot oil, can be controlled to have low air permeability, and can be sealed to prevent contamination by foreign matters, a method for producing the same, and use thereof.SOLUTION: A method for producing a pulp molded container comprises a step of providing a main material including long fiber pulp and short fiber pulp, a pulp dispersing step, a pulping step, an additive adding step and a heat compression molding step. The main material is fibrillated to reach a sufficient degree of starch gelatinization, which is useful for thermocompression molding of pulp mold containers. The additives include a special processing process of nano-cellulose and / or starch.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a pulp molded container, a manufacturing method thereof, and uses thereof, and more particularly to a pulp molded container that is resistant to penetration of hot oil, can be controlled to have low air permeability, and can be sealed, a manufacturing method thereof, and uses thereof for serving instant foods that can be heated in an oven or microwave. [Background technology]

[0002] As the concept of environmental protection becomes increasingly important in each country, advocating the use of biomass renewable energy, making materials degradable and recyclable, and reducing the use of plastic products have already become common goals in many countries around the world. Therefore, pulp mold containers have been developed for short-term food storage. According to "Easy-to-Understand Knowledge of Paper" published by the Paper Museum, the main raw material of paper is wood fiber, and wood is roughly divided into coniferous trees and broad-leaved trees. Coniferous trees are soft and have long fibers, so they have been used since the early days when pulp-making technology was developed. Broad-leaved trees are generally hard, heavy, and have short fibers, and have been widely used as pulp materials since around 1955. However, in the food-related industry, plastic containers are still the most commonly used material for serving food. Plastic has good gas barrier properties, high temperature oil resistance, heat sealability, and waterproof properties, and is inexpensive. At present, there is no other material that can meet these requirements other than plastic, so plastic containers are the only packaging containers currently available for instant foods suitable for microwave ovens. Summary of the Invention [Problem to be solved by the invention]

[0003] Currently, there are many pulp-molded containers on the market for serving food only for a short time. However, the gas barrier property and oil barrier property of commonly seen pulp-molded containers are relatively low, and it is also difficult to maintain their oil resistance during heating by an oven or a microwave oven. Therefore, pulp-molded containers are still limited in terms of serving food. Fast food restaurants and packaging containers for instant foods in supermarkets are in great demand, disposable, and have complex performance requirements, so pulp-molded products are not used. In addition, all conventional pulp-molded containers cannot be sealed by heat sealing to prevent contamination and cannot be used for the purpose of serving commercially available instant foods for a long time. As a current improvement method, it is to attach a plastic film to the pulp-molded container. However, in this method, the plastic content is still high, the material is expensive, and the problem of being difficult to recycle is also caused.

[0004] Since freshness is required for instant foods, and their shelf life is usually 2 to 10 days, the packaging design of instant foods no longer needs to use packaging containers made of materials with barrier properties composed of metal, glass, plastic, and paper. On the premise of not increasing the cost too much, a pulp-molded container that directly adds a small amount of additives in the pulp process is developed, which can achieve the characteristics of oil resistance and low air permeability. In this way, it can also meet the requirements of environmental protection sustainability. Currently, the technical problem that there is still no material that meets the requirements of environmental protection for manufacturing containers for serving instant foods is solved.

[0005] To sum up, the development of a pulp-molded container and its manufacturing method that can be produced, have good gas barrier performance and oil resistance performance, can be used at high temperatures, and meet the requirements of environmental protection is very crucial.

[0006] The present invention aims to provide a pulp mold container for instant foods for a microwave oven or an oven, which is made of an environmental protection material or a recycled material that is decomposable, recyclable as paper, capable of replacing plastic or reducing the amount of plastic, and a method for manufacturing the same.

Means for Solving the Problems

[0007] One aspect of the present invention includes a step of providing a main material containing long fiber pulp and short fiber pulp in an amount of 1 to 99 weight percent based on 100 weight percent of the main material, a pulp disintegration step of uniformly dispersing the main material in water to form a pulp aqueous solution, a fibrillation step of mechanically fibrillating the pulp aqueous solution to form fibrillated pulp, and an additive addition step of adding and mixing an additive containing nanocellulose in an amount of 0.1 to 30 weight percent and / or starch in an amount of 1 to 50 weight percent based on 100 weight percent of the main material to the fibrillated pulp to form pulp for a pulp mold. with a drainage degree of 300 to 600 The method for manufacturing a pulp mold container includes a hot compression molding step of subjecting the pulp for a pulp mold to a pre-gelatinized starch gelatinization step of preheating the pulp for pulp molding at a temperature exceeding 100°C for 1 second or more to obtain a pulp for pre-gelatinized starch gelatinized pulp mold, and pre-gelatinized starch gelatinization form a pulp mold container. hot-compress at 100°C or higher for 10 seconds or more to cause a gelatinization reaction for shaping According to the method for manufacturing a pulp mold container of the above-described embodiment, the nanocellulose may be nanofiber cellulose, nanocellulose crystal, or bacterial nanocellulose, and the starch may be natural starch or processed starch. obtain According to the method for manufacturing a pulp mold container of the above-described embodiment, the additive may further contain at least one inorganic substance and / or polymer, and the polymer does not contain nanocellulose and starch.

[0008] According to the method for manufacturing a pulp mold container of the above-described embodiment, the nanocellulose may be nanofiber cellulose, nanocellulose crystal, or bacterial nanocellulose, and the starch may be natural starch or processed starch.

[0009] According to the method for manufacturing a pulp mold container of the above-described embodiment, the additive may further contain at least one inorganic substance and / or polymer, and the polymer does not contain nanocellulose and starch.

[0010] According to the method for manufacturing a pulp molded container of the foregoing embodiment, the inorganic substances may include calcium carbonate, bentonite, montmorillonite, shell powder, calcium silicate, kaolin, mica, borax, diatomaceous earth, apatite, talc, titanium dioxide, aluminum compounds, and mixtures thereof, and the polymers may include polybutylene adipate terephthalate, polybutylene succinate, polybutylene succinate adipate, polyhydroxyoctanoate, polycaprolactone, polyvinyl alcohol, polylactic acid, polyglycolic acid, polyhydroxyalkanoate, polyhydroxybutyrate, poly(3-hydroxybutyrate-co-3-hydroxyvalerate), p-hydroxybenzoic acid hydrazide, xanthan gum, cellulose derivatives, animal glue, vegetable glue, chitin, protein, polyolefin fibers, maleic anhydride polymers, polyurethanes, wax slurries, poly(ethylene-2,5-furanoate), aqueous acrylics, alkyl ketene dimers, polyaluminum chloride, or mixtures thereof.

[0011] According to the method for manufacturing a pulp molded container of the foregoing embodiment, based on 100 weight percentages of the main material, the addition amount of the inorganic substances may be 1 weight percentage to 10 weight percentages, and the addition amount of the polymers is 0.1 weight percentage to 20 weight percentages.

[0012] According to the method for manufacturing a pulp molded container of the foregoing embodiment, it may further include a coating step of coating the surface of the pulp molded container with the first coating agent and / or the second coating agent.

[0013] According to the method for manufacturing a pulp molded container of the foregoing embodiment, the first coating agent and the second coating agent may each contain calcium carbonate, bentonite, montmorillonite, shell powder, calcium silicate, kaolin, mica, borax, diatomaceous earth, apatite, talc, titanium dioxide, aluminum compound, polybutylene adipate terephthalate, polybutylene succinate, polybutylene succinate adipate, polyhydroxyoctanoate, polycaprolactone, polyvinyl alcohol, polylactic acid, polyglycolic acid, polyhydroxyalkanoate, polyhydroxybutyrate, poly(3-hydroxybutyrate-co-3-hydroxyvalerate), p-hydroxybenzoic acid hydrazide, xanthan gum, starch, cellulose, cellulose derivative, animal glue, vegetable glue, chitin, protein, polyolefin fiber, maleic anhydride polymer, polyurethane, wax slurry, poly(ethylene-2,5-furanoate), aqueous acrylic, alkyl ketene dimer, polyaluminum chloride or a mixture thereof, and the first coating agent and the second coating agent may be the same or different.

[0014] According to the method for manufacturing a pulp molded container of the foregoing embodiment, based on 100 weight percentages of the main material, the coating amount of the first coating agent may be 0.1 weight percentage to 40 weight percentages, and the coating amount of the second coating agent may be 0.1 weight percentage to 40 weight percentages.

[0015] According to the method for manufacturing a pulp molded container of the foregoing embodiment, before the hot compression molding step, a pregelatinized starch step of preheating the pulp for pulp molding at 100°C or higher for 1 second or longer to obtain pregelatinized starch pulp for pulp molding may be further included.

[0016] According to the method for manufacturing a pulp molded container of the foregoing embodiment, in the hot compression molding step, the pregelatinized starch pulp for pulp molding may be hot compressed at 100°C or higher for 10 seconds or longer to cause a gelatinization reaction for shaping to obtain a pulp molded container.

[0017] Accordingly, the method for manufacturing a pulp molded container of the present invention can manufacture a pulp molded container having nanocellulose and / or starch as main additives, high-temperature oil resistance, low air permeability, sealability, and easy-openability.

[0018] Another aspect of the present invention provides a pulp molded container manufactured by the method for manufacturing a pulp molded container described above. a pulp mold container obtained, wherein the pulp mold container has low air permeability and is tested by a Gurley air permeability tester according to ASTM D726 and GB / T458 The number of seconds in the quantitative gas permeability test is is 56 seconds or more provided.

[0019] According to the pulp molded container of the above-described embodiment, the pulp molded container may have sealability and easy-openability, and the easy-open tensile force value is 50 grams to 1200 grams.

[0020] According to the pulp molded container of the above-described embodiment, the pulp molded container may have high-temperature oil resistance.

[0021] Accordingly, the pulp molded container of the present invention is applicable for holding instant foods that may be refrigerated or frozen and / or heated in a microwave oven or an oven.

[0022] A further aspect of the present invention provides the use of a pulp molded container for holding instant foods that are eaten after being refrigerated or frozen and / or heated in a microwave oven or an oven.

Advantages of the Invention

[0023] According to the present invention, in a method for manufacturing a pulp-molded container, by adding additives such as nanocellulose and / or starch to fibrillated pulp, the pulp-molded container has the effects of high-temperature oil resistance and low air permeability, can improve the high-temperature oil penetration resistance of the current pulp-molded container, and meets the functions required for the packaging of instant foods. Furthermore, the pulp-molded container can be applied to the holding, storage, and heating of foods or liquids, and at the same time, it can solve the problem that plastic packaging containers become hot enough to burn hands at high temperatures, and can replace the current plastic containers for instant foods. Therefore, it may be used as a measure to reduce plastic in disposable plastic containers.

[0024] The following description of the accompanying drawings is for the purpose of making the above and other objects, features, merits, and embodiments of the present invention clearer and easier to understand.

Brief Description of the Drawings

[0025]

Figure 1

Figure 2

Modes for Carrying Out the Invention

[0026] Hereinafter, a plurality of embodiments of the present invention will be described with reference to the drawings. For the sake of clear explanation, many practical details will be described together in the following description. However, it should be understood that these practical details are not applied to limit the present invention. That is, in some embodiments of the present invention, these practical details are not necessary. Also, for the purpose of simplifying the drawings, some conventional structures and elements are shown simply and schematically in the drawings, and overlapping elements may be represented by the same reference numerals.

[0027] Please refer to Fig. 1, which is a process flow chart showing a method 100 for manufacturing a pulp molded container according to one embodiment of the present invention. The method 100 for manufacturing a pulp molded container includes steps 110, 120, 130, 140, and 150.

[0028] Step 110 is a step of providing a main material. Specifically, the main material includes long fiber pulp and short fiber pulp. Based on 100 weight percent of the main material, the long fiber pulp may be 1 weight percent to 99 weight percent, preferably 10 weight percent to 50 weight percent. Generally, the long fiber pulp mainly affects the tensile strength of the product, and the short fiber pulp mainly affects the uniformity of the product. Therefore, desired product properties can be obtained by controlling the ratio of long fiber pulp to short fiber pulp in the main material.

[0029] Step 120 is a pulping step in which the base material is uniformly dispersed in water to form an aqueous pulp solution.

[0030] Step 130 is a pulping step in which the aqueous pulp solution is mechanically fibrillated to form fibrillated pulp. Specifically, fibrillation refers to the occurrence of phenomena such as fluffing, tearing, and thread separation in the cell walls of the fibers contained in the aqueous pulp solution, which gives the aqueous pulp solution flexibility and plasticity and increases the bonding strength between the fibers. Specifically, in step 130, the aqueous pulp solution may be pulped multiple times so that the freeness of the fibrillated pulp reaches a value between 300 and 600, but the present invention is not limited thereto.

[0031] More specifically, freeness can be used to measure the drainage performance of pulp, and since freeness is related to the degree of pulping of pulp, the manufacturing method 100 of the pulp molded container of the present invention can increase the freeness to a desired range by pulping the pulp aqueous solution multiple times, thereby adjusting the drainage performance of the fibrillated pulp.

[0032] Step 140 is an additive addition step in which a small amount of additive is directly added to the fibrillated pulp and mixed to form pulp for pulp molding. This pulp for pulp molding is low-cost and meets the requirements for mass production. The additives include nanocellulose and / or starch. Based on 100 weight percent of the base material, the amount of nanocellulose added is 0.1 weight percent to 30 weight percent, and the amount of starch added is 1 weight percent to 50 weight percent. Specifically, nanocellulose has high mechanical strength, tunable surface chemistry, crystallinity, barrier properties, and biodegradability, and can be nanofibrous cellulose (nano cellulose fibril; NCF), nanocellulose nanocrystals (cellulose nanocrystals; CNC), or bacterial nanocellulose (bnc). The starch may be a natural starch or a modified starch, and the modified starch may be a modified starch, a cationic starch, or an amphoteric starch. The degree of starch gelatinization can be controlled later to achieve the objectives of high-temperature oil resistance and gas barrier properties.

[0033] Also, there are limits to both the gelatinization degree of starch and the addition amounts of starch and nano-carbon fibers, and they should not be added excessively. Therefore, depending on the different efficacy strengths of the desired pulp mold container, such as reducing air permeability and improving sealability, easy opening property, or high-temperature oil resistance, the additive may further contain an inorganic substance or / and a polymer. An oil-resistant agent such as MF300 may be added to the additive. The above inorganic substances may include calcium carbonate, bentonite, montmorillonite, shell powder (which may be antibacterial shell powder, for example), calcium silicate, kaolin, mica, borax, diatomaceous earth, apatite, talc, titanium dioxide, aluminum compounds (such as aluminum sulfate, aluminum oxide, etc.) and mixtures thereof. The above polymer does not include nanocellulose and starch, and may be a biodegradable polymer or a non-biodegradable polymer. Biodegradable polymers include oil-base synthetic polymers, biomass-based synthetic polymers, microbial fermentation polymers, and natural product polymers. Further, the above polymers include poly-butyleneadipate-co-terephthalate (PBAT), polybutylene-succinate (PBS), polybutylene succinate adipate (PBSA), polycaprolactone (PCL), polyvinyl alcohol (PVA), polylactide (PLA), polyglycolic acid (PGA), poly-hydroxyoctanoate (PHO), poly-hydroxyalkanoates (PHA), poly-hydroxybutyrate (PHB), poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV), p-hydroxybenzoic acid hydrazide (p-hydroxybenzoic acid;The binder may include, for example, cellulose derivatives (e.g., carboxymethyl cellulose, methyl cellulose, hydroxypropyl cellulose, ethyl cellulose, or those derived from beer grounds or bagasse), animal glue (e.g., gelatin), vegetable glue (e.g., pectin, carrageenan, locust bean gum, seaweed gel, rosin), chitin (e.g., chitosan), protein (e.g., whey protein, casein, albumin, soy protein lysate), polyolefin fiber, maleic anhydride polymer, polyurethane (PU), wax slurry, poly(ethylene 2,5-furanoate) (PEF), aqueous acrylic, alkyl ketene dimer (AKD), polyaluminum chlorohydrate (PAC), or mixtures thereof. Furthermore, based on 100% by weight of the main material, the amount of the polymer added may be 0.1% by weight to 20% by weight, and the amount of the inorganic substance added may be 1% by weight to 10% by weight.

[0034] Specifically, because the additives described above are all materials with a dense structure or small particles, pulp-molded containers made from pulp for pulp molding containing the additives described above have high-temperature oil resistance and low air permeability. This is because the gaps in the pulp-molded container that gas and oil could pass through are blocked by the fine particles of the additives, creating a "bypass effect" when gas or oil passes through the pulp-molded container, i.e., the gas or oil must travel a longer path to permeate the pulp-molded container. Furthermore, glue may be used as a binder for pulp fibers to increase strength, thereby reducing the cost of using pulp raw materials. Therefore, pulp-molded containers manufactured by the pulp-molded container manufacturing method 100 of the present invention can have excellent gas and oil barrier properties.

[0035] Process 150 is a hot compression molding process that forms a pulp mold container by hot compressing pulp for a pulp mold. Specifically, the present invention is not limited to the appearance or structural design of the pulp mold container, and it is sufficient that the structure can hold food or liquid so as to effectively barrier gas and oil.

[0036] Referring to FIG. 2, FIG. 2 is a process flowchart showing a manufacturing method 200 of a pulp mold container according to another embodiment of an embodiment of the present invention. The manufacturing method 200 of the pulp mold container includes process 210, process 220, process 230, process 240, process 250, process 260, and process 270. Since process 210, process 220, process 230, and process 240 are the same as process 110, process 120, process 130, and process 140 of the manufacturing method 100 of the pulp mold container in FIG. 1, they will not be described repeatedly here.

[0037] Process 250 is a pre-dextrin gelatinization process that preheats the pulp for a pulp mold obtained through processes 210 to 240 at 100° C. or higher for 1 second or longer to obtain a pre-dextrin gelatinized pulp for a pulp mold. The water content of the pre-dextrin gelatinized pulp for a pulp mold after being processed by process 250 is about 50% to 90%. This is a crucial technique that affects the complete gelatinization degree and speed of starch, but does not affect the needs of mass production, and its preheating time and temperature vary depending on the machine.

[0038] Process 260 is a hot compression molding process that hot compresses the pre-dextrin gelatinized pulp for a pulp mold at 100° C. or higher for 10 seconds or longer to cause a gelatinization reaction for shaping to obtain a pulp mold container. It may be further dried after shaping. The water content of the pulp mold container after being completely gelatinized through the treatment of process 260 is about 5% to 10%.

[0039] Process 270 is a coating process for applying the first coating agent and / or the second coating agent to the surface of the pulp mold container. Specifically, the first coating agent and the second coating agent each contain 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 terephthalate, polybutylene succinate, polybutylene succinate adipate, polyhydroxyoctanoate, polycaprolactone, polyvinyl alcohol, polylactic acid, polyglycolic acid, polyhydroxyalkanoate, polyhydroxybutyrate, poly(3-hydroxybutyrate-co-3-hydroxyvalerate), p-hydroxybenzoic acid hydrazide, xanthan gum, starch, cellulose, cellulose derivatives, animal glue, plant glue, chitin, protein, polyolefin fiber, maleic anhydride polymer, polyurethane, wax slurry, poly(ethylene-2,5-furanoate), aqueous acrylic, alkyl ketene dimer, polyaluminum chloride or a mixture thereof, and the first coating agent and the second coating agent may be the same or different. Based on 100 weight percentages of the main material, the coating amount of the first coating agent may be 0.1 weight percentage to 40 weight percentages, and the coating amount of the second coating agent may be 0.1 weight percentage to 40 weight percentages.

[0040] Specifically, since the first coating agent and the second coating agent have a dense structure after drying, gas or liquid is difficult to permeate through the coating layer formed by the first coating agent and / or the second coating agent, thereby further enhancing the gas barrier effect and oil barrier effect of the pulp mold container.

[0041] Another aspect of the present invention provides a pulp molded container manufactured by the aforementioned pulp molded container manufacturing method 100 or pulp molded container manufacturing method 200, in which the number of seconds in a quantitative gas permeability test is improved by more than 20% by blocking the micropores in the pulp molded container with an additive. Preferably, when the additive in the additive addition step further includes a polymer and / or an inorganic substance, the additive blocks the micropores in the pulp molded container due to a bypass effect, and the number of seconds in a quantitative gas permeability test of the pulp molded container is improved by more than 1.5 times. More preferably, when the pulp molded container manufacturing method includes a coating step, the manufactured pulp molded container includes a coating layer that can block the micropores in the pulp molded container, and the number of seconds in a quantitative gas permeability test of the pulp molded container is improved by more than 32 times.

[0042] Specifically, please refer to Table 1 below, which shows different property requirements that can be achieved when manufacturing the pulp molded container of the present invention using different formulations and / or processes. ◎ indicates excellent results, ○ indicates good results, Δ indicates average results, and × indicates poor results. Comparative Example 1 is a pulp molded container with no additives added, Comparative Example 2 is a non-pulp molded paperboard folding container, and Comparative Example 3 is a plastic container used for control comparison.

[0043] [Table 1]

[0044] As can be seen from the comparison results in Table 1, the pulp molded containers manufactured by the manufacturing method of the present invention have high-temperature oil resistance, low air permeability, sealability, and easy-open properties, and can therefore be used to serve instant foods. The instant foods can be stored refrigerated or frozen, and / or further heated in a microwave or oven before consumption. According to the manufacturing method of the present invention, the strength and toughness of the pulp molded container can be improved by adding special additives, which allows the container to be used to manufacture paper cups and / or paper cup lids, making the paper cups and paper cup lids less likely to deform or leak when opened and closed during use. Furthermore, because conventional paper containers have problems with seepage and leakage when filled with liquids such as hot soup or oil, plastic bags are used for all food delivery. However, most plastic bags contain plasticizers that are unsuitable for serving hot liquids. The pulp molded containers of the present invention are particularly suitable for serving hot soup or foods containing hot oil, eliminating the need for plastic bags and providing an environmentally friendly, safe, and hygienic solution.

[0045] [Test example] To meet different property requirements, in the following test examples, the molded pulp containers of the present invention were manufactured using different formulations and / or processes, and a conventional molded pulp container was used as a comparative example. Please refer to Table 2 below, which shows the composition of additives in each test example of the molded pulp container of the present invention and the comparative example. Furthermore, based on 100 weight percent of the main material, the main materials used in the following test examples each contained 30 weight percent long fiber pulp and 70 weight percent short fiber pulp, to avoid the test results being affected by differences in the composition of the main materials between each test example.

[0046] [Table 2]

[0047] During the test, oil resistance tests, quantitative gas permeability tests, and easy-opening tensile strength tests were further conducted in the above test examples and comparative examples. For the oil resistance test, the Kit value was tested according to the TAPPI 557 standard, and the oil temperature penetration degree was tested by the method of the affiliated company. The quantitative gas permeability test was tested by a Gurley permeability tester according to ASTM D726 and GB / T 458. The easy-opening tensile strength test was measured by the ASTM D882 method. Also, please refer to Table 3 below. Table 3 shows the results of the above tests in the test examples and comparative examples.

[0048]

Table 3

[0049] As can be seen from the test results of the high-temperature oil resistance test in Table 3, even when the oil temperature exceeds 80°C, the pulp mold container of the present invention will not be penetrated. All the pulp mold containers manufactured by the manufacturing method of the pulp mold container of the present invention have better high-temperature oil resistance performance and have been shown to be applicable to holding hot foods or heating foods held in a microwave oven or oven. Also, the number of seconds of the quantitative gas permeability test of the pulp mold containers in each test example with additives added is all longer than the number of seconds of the quantitative gas permeability test of the pulp mold container in Comparative Example 1. It has been proven that the pulp mold containers manufactured by the manufacturing method of the pulp mold container of the present invention have a better gas barrier effect and can further maintain the flavor of the packaged contents. In addition, since all the pulp mold containers manufactured by the manufacturing method of the pulp mold container of the present invention have sealability and easy-opening characteristics, the packaging can be sealed to prevent the packaged contents from being contaminated by foreign substances, bacteria, etc.

[0050] In summary, the method for producing a pulp molded container of the present invention involves adding nanocellulose and / or starch to fibrillated pulp, or further adding inorganic substances and / or polymers that do not contain nanocellulose or starch.This results in the pulp molded container of the present invention having excellent gas barrier and oil barrier effects, and can be used as a container for storing food or liquid, and is also suitable for heating in a microwave oven or oven, making it more widely applicable than currently known pulp molded containers.

[0051] Although the present invention has been disclosed above by way of the embodiments, the embodiments do not limit the present invention, and those skilled in the art may make various changes and modifications without departing from the spirit and scope of the present disclosure. Therefore, the scope of protection of the present invention is determined by the content specified in the following claims. [Explanation of symbols]

[0052] 100, 200 Manufacturing method of pulp molded containers

Claims

1. providing a main material including long fiber pulp and short fiber pulp in an amount of 1 wt% to 99 wt% based on 100 wt% of the main material; a pulp disintegration step of uniformly dispersing the main material in water to form an aqueous pulp solution; a pulping step of mechanically fibrillating the aqueous pulp solution to form fibrillated pulp having a drainage degree of 300 to 600; an additive addition step of adding and mixing an additive including nanocellulose having an addition amount of 0.1 wt% to 30 wt% based on 100 wt% of the main material and / or starch having an addition amount of 1 wt% to 50 wt% to the fibrillated pulp to form pulp for a pulp mold; a pre-gelatinized starch gelatinization step of preheating the pulp for a pulp mold at a temperature exceeding 100°C for 1 second or more to obtain pulp for a pre-gelatinized starch gelatinized pulp mold; a hot compression molding step of hot-compressing the pulp for a pre-gelatinized starch gelatinized pulp mold at 100°C or higher for 10 seconds or more to cause a gelatinization reaction for shaping to obtain a pulp mold container; A method for manufacturing a pulp mold container including the above steps.

2. The method for manufacturing a pulp mold container according to Claim 1, wherein the nanocellulose is nanofiber cellulose, nanocellulose crystal or bacterial nanocellulose, and the starch is natural starch or processed starch.

3. The method for manufacturing a pulp mold container according to Claim 1, wherein the additive further includes an inorganic substance and / or a polymer, and the polymer does not include the nanocellulose and the starch.

4. The inorganic substance includes calcium carbonate, bentonite, montmorillonite, shell powder, calcium silicate, kaolin, mica, borax, diatomaceous earth, apatite, talc, titanium dioxide, aluminum compounds, and mixtures thereof, and the polymer includes polybutylene adipate terephthalate, polybutylene succinate, polybutylene succinate adipate, polyhydroxyoctanoate, polycaprolactone, polyvinyl alcohol, polylactic acid, polyglycolic acid, polyhydroxyalkanoate, polyhydroxybutyrate, poly(3-hydroxybutyrate-co-3-hydroxyvalerate), p-hydroxybenzoic acid hydrazide, xanthan gum, cellulose derivatives, animal glue, vegetable glue, chitin, protein, polyolefin fiber, maleic anhydride polymer, polyurethane, wax slurry, poly(ethylene-2,5-furanoate), aqueous acrylic, alkyl ketene dimer, polyaluminum chloride, or mixtures thereof. The method for manufacturing a pulp mold container according to claim 3.

5. Based on 100 weight percentages of the main material, the addition amount of the inorganic substance is 1 weight percentage to 10 weight percentages, and the addition amount of the polymer is 0.1 weight percentage to 20 weight percentages. The method for manufacturing a pulp mold container according to claim 4.

6. The method for manufacturing a pulp mold container according to claim 1, further including a coating step of coating a first coating agent and / or a second coating agent on the surface of the pulp mold container.

7. The first coating agent and the second coating agent each contain calcium carbonate, bentonite, montmorillonite, shell powder, calcium silicate, kaolin, mica, borax, diatomaceous earth, apatite, talc, titanium dioxide, aluminum compounds, polybutylene adipate terephthalate, polybutylene succinate, polybutylene succinate adipate, polyhydroxyoctanoate, polycaprolactone, polyvinyl alcohol, polylactic acid, polyglycolic acid, polyhydroxyalkanoate, polyhydroxybutyrate, poly(3-hydroxybutyrate-co-3-hydroxyvalerate), p-hydroxybenzoic acid hydrazide, xanthan gum, starch, cellulose, cellulose derivatives, animal glue, vegetable glue, chitin, protein, polyolefin fiber, maleic anhydride polymer, polyurethane, wax slurry, poly(ethylene-2,5-furanoate), aqueous acrylic, alkyl ketene dimer, polyaluminum chloride or a mixture thereof, and the first coating agent and the second coating agent are the same or different. The method for manufacturing a pulp molded container according to claim 6.

8. Based on 100 weight percentages of the main material, the coating amount of the first coating agent is 0.1 weight percentage to 40 weight percentages, and the coating amount of the second coating agent is 0.1 weight percentage to 40 weight percentages. The method for manufacturing a pulp molded container according to claim 6.

9. The pulp molded container has low air permeability, and the number of seconds of the quantitative gas permeability test by a Gurley air permeability tester according to ASTM D726 and GB / T 458 is 56 seconds or more. The method for manufacturing a pulp molded container according to claim 1.

10. The pulp molded container has sealability and easy-openability, and the easy-open tensile force value is 50 grams to 1200 grams. The method for manufacturing a pulp molded container according to claim 1.

11. The pulp molded container has high-temperature oil resistance. The method for manufacturing a pulp molded container according to claim 1.

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