WO2019000514A1

WO2019000514A1 - Paper cup having biodegradable coating, and manufacturing method thereof

Info

Publication number: WO2019000514A1
Application number: PCT/CN2017/093656
Authority: WO
Inventors: 肖南
Original assignee: 重庆泰宝纸制品有限公司
Priority date: 2017-06-28
Filing date: 2017-07-20
Publication date: 2019-01-03

Abstract

The present invention relates to the technical field of paper cups, and particularly relates to a paper cup having a biodegradable coating and manufacturing method thereof, solving the technical problem of the prior art in which degradation of a paper cup coating is slow. The paper cup having a biodegradable coating comprises a body (1) and a lower portion (2). The lower portion (2) is connected to a lower end of the body (1). A space enclosed by inner surfaces of the body (1) and the lower portion (2) can contain a liquid. An upper edge of the body (1) forms an opening (11). The body (1) and lower portion (2) respectively comprise a substrate and a biodegradable material coating, and the biodegradable material coatings form the inner surfaces of the body (1) and the lower portion (2).

Description

Biodegradable coated paper cup and production method thereof

Technical field

The invention relates to the technical field of paper cups, in particular to a biodegradable coated paper cup and a production method thereof.

Background technique

In order to achieve a functional water-repellent effect in the production of existing paper cups, a water-repellent coating is applied to the inner wall. Conventional paper cup materials are mainly composed of base paper and coating. The current main coatings can be divided into the following two categories: 1 petroleum base: traditional plastics: PE (polyethylene), PP (polypropylene), PS (polystyrene), PC ( Polycarbonate), PET (polyethylene terephthalate), ABS (acrylonitrile-butadiene-styrene), PMMA (polymethyl methacrylate), nylon, etc.; 2 starch and PE mixed base : Bio-PE (bio-polyethylene) Bio-PP (bio-polypropylene) Bio-PA (bio-polyamide) PTT (polytrimethylene terephthalate). The oil machine material has excellent comprehensive performance and is the main material in people's production and life.

At present, the mainstream paper cups are mainly coated with low density polyethylene (LDPE). The paper cups produced are called PE coated paper cups. The molecular structure of the materials is very stable and it is difficult to be degraded by light and heat in nature. 200 years. If the decomposition is accelerated, it needs to be decomposed to ethylene (normal temperature gaseous state) by high-temperature incineration (>240 ° C), and also accompanied by various harmful oxidation products. At present, the production and use of PE coated paper cups in production and life are huge. PE synthetic polymer materials are difficult to degrade after being discarded, resulting in ecological environment pollution, and the pollution is expanding. Such pollution can be attributed to white pollution. White pollution refers to an image of environmental pollution caused by waste plastics. Specifically, it refers to packaging bags made of polymer compounds such as polyethylene, polypropylene, and polyvinyl chloride. Plastic articles such as disposable tableware and plastic bottles are discarded as solid waste after use. Due to random littering, it is difficult to degrade and treat, causing irreversible pollution to the ecological environment and landscape. It mainly uses 1 visual pollution: the waste plastic packaging scattered in the city, tourist area, water body and roads will bring bad stimulation to people's vision, affecting the overall beauty of the city and scenic spots, destroying the city appearance and scenery; 2 potential hazards: Invasion of excessive land, pollution of air, pollution of water bodies, fire hazards, difficult to degrade, resulting in long-term deep ecological and environmental problems.

Faced with the increasingly serious problem of white pollution, people hope to find a plastic substitute that can replace the current PE coated paper cup without causing white pollution, and develop and apply the domestic paper products industry for a series of problems such as the difficulty of PE coated paper cup degradation. PLA as a coated paper cup; PLA is a shorthand for the biodegradable plastic polylactic acid, written as: polylactice acid. Lactic acid can be produced by fermenting sugar derived from cereals or other organic matter, and lactic acid can be obtained by polymerization to obtain a linear aliphatic polyester, polylactic acid (PLA). The degradation of PLA is divided into two stages. The first stage is that its ester group is gradually hydrolyzed into lactic acid and other small molecules, and then these small molecules are decomposed by microorganisms in the environment, because the degradation proceeds step by step, and the degradation rate is slow. PLA is often blended with starch to enhance its degradability and reduce cost. Some producers also often use some other degradable polyesters to blend with PLA; however, this blend is hard and brittle and has poor plasticity, so it is also softened by adding some plasticizers such as glycerin and sorbitol. some.

Summary of the invention

It is an object of the present invention to provide a biodegradable coated paper cup and a method for producing the same to solve the technical problem of slow degradation of the paper cup coating existing in the prior art.

In order to achieve the above object, the present invention provides the following technical solution: a biodegradable coated paper cup comprising a cup body and a cup bottom, the cup bottom being connected at a lower end of the cup body, the cup body and the cup bottom a space between the inner surfaces capable of containing a liquid, the edge of the cup body forming an opening; the cup body and the cup bottom each comprising a substrate and a biodegradable material coating, the biodegradable material coating forming the The inner surface of the cup and the bottom of the cup.

Preferably, the biodegradable waterproof material is polybutylene succinate.

Preferably, the biodegradable waterproof material is a mixture of polybutylene succinate, an antioxidant, and a release agent.

Preferably, the outer surface of both the cup body and the cup bottom is also coated with the biodegradable material coating.

Preferably, the substrate of the cup body comprises corrugated paper and base paper, the corrugated paper is adhered to one side of the base paper, and the other side of the base paper is coated with a biodegradable material.

Preferably, the corrugated paper is a single corrugated paper, double corrugated paper, cross paper or S tile paper;

Preferably, the side of the cup body is provided with two handles, and the two handles are in the width direction of the cup body. Symmetrically disposed, any of the handles is rotated about a connection portion of the handle and the cup body, and when the biodegradable coated paper cup is not in use, the handle is attached to the cup body when When the biodegradable coated paper cup is used, the handle is in a deployed shape.

Preferably, the cup bottom is circular, the periphery of the round cup bottom extends outwardly from the annular rib, and the outer surface of the cup bottom is coated with a waterproof coating.

A method for producing a biodegradable coated paper cup comprising the following steps:

Coating step: coating a surface of the base paper with a biodegradable material by a casting method;

Corrugating step: bonding the surface of the biodegradable material coated on the base paper to the corrugated paper;

Forming step; cutting the paper cup into a paper cup shape.

Preferably, a step of printing is further included between the corrugating step and the forming step, the printing step being printing a pattern or mark on an outer surface of the paper cup.

DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below. Obviously, the drawings in the following description are only It is a certain embodiment of the present invention, and other drawings can be obtained from those skilled in the art without any creative work.

1 is a schematic structural view of a biodegradable coated paper cup according to the present invention;

Figure 2 is a bottom plan view of the biodegradable coated paper cup of the present invention;

3 is a schematic view showing the structure of a paper cup of the biodegradable coated paper cup of the present invention.

Detailed ways

In order to make the objects, technical solutions and advantages of the present invention more clear, the technical solutions of the present invention will be described in detail below. It is apparent that the described embodiments are only a part of the embodiments of the invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

The invention provides a biodegradable coated paper cup, comprising a cup body 1 and a cup bottom 2, the cup bottom 2 is attached to the lower end of the cup body 1, the space between the inner surface of the cup body 1 and the cup bottom 2 can accommodate liquid, and the edge of the upper end of the cup body 1 forms an opening 11; the cup body 1 and the cup The bottoms 2 each comprise a substrate and a coating of biodegradable material forming the inner surface of the cup 1 and the cup bottom 2.

As an alternative embodiment, the biodegradable waterproof material is polybutylene succinate.

Polybutylene succinate (PBS) is synthesized by condensation polymerization of succinic acid and butanediol. The resin is milky white, odorless and tasteless, and is easily decomposed and metabolized by various microorganisms or enzymes in nature. It is finally decomposed into carbon dioxide and water; it has good biocompatibility and bioabsorbability; heat resistance is good, heat distortion temperature and product use temperature can exceed 100 °C. The source of synthetic raw materials can be either petroleum resources or fermented by biological resources.

As an alternative embodiment, the biodegradable waterproof material is a mixture of polybutylene succinate, an antioxidant, and a release agent.

The degradation conditions of biodegradable waterproof materials include the following:

1 biodegradable, producing water by degradation of naturally occurring microorganisms such as bacteria, fungi and algae;

2 compostable plastics: EN13432, EN14995, ASTM D6400, ISO17088, AS4736, TIS17088 controlled conditions: 60 ° C;

3 fission disintegration: decomposition into small pieces of 2x2mm within 12 weeks;

4 Biodegradation: ≥90% is decomposed into carbon dioxide, water and minerals by biological action within 6 months.

As an optional embodiment, the substrate is a high quality food grade white card base paper, and the application specifications of the white card base paper are as shown in Table 1.

Table 1 White Card Base Paper Application Specifications

As an alternative embodiment, polybutylene succinate, obtained by esterification polycondensation of succinic acid (succinic acid) and 1.4 butanediol, the composition of the biodegradable waterproof material is as shown in Table 2, characteristics as follows:

1FZ71PM (injection molding, better adhesion, more suitable for Asian customers)

2FZ91PM (extrusion, better processing stability, more suitable for European customers)

3MZ7A0101 (antioxidant)

4MB92AM (antioxidant)

5MB71BM (release agent ~ anti-blocking cooling cylinder)

6MZ7C0201 (release agent ~ anti-blocking cooling cylinder)

Table 2 biodegradable waterproof material composition

As an optional embodiment, the substrate of the biodegradable coated paper cup and the biodegradable material coating constitute a biodegradable coated paper cup paper, the quality standard of the biodegradable coated paper cup paper and the detection report have the main detection indexes. : 1 quantitative 2 quantitative difference 3 banner quantitative difference 4 thickness 5 banner thickness difference 6 size error (reel diameter + width) 7 whiteness 8 PBS quantitative difference 9 moisture 10 stiffness

Smoothness

Peel strength

Ash

Dust

Water absorption

Side seepage

Exterior

Odor

hygiene standard

Plasticizer indicators, etc., specific test indicators are shown in Table 3 - Table 4.

Table 3 Biodegradable coated paper cup paper quantitative and peel strength test

Table 4 Biodegradable coated paper cup paper permeability, water permeability test indicators

Its ventilation standard value: water (WVTR): ASTM E96/E96m-10 → temperature: 38 ° C / 90% RH; oxygen (OTR): ASTM D3985-05 → temperature: 23 ° C / 0% RH

As an alternative embodiment, the outer surface of both the cup 1 and the cup bottom 2 is also coated with the biodegradable material coating.

As an alternative embodiment, the substrate of the cup 1 comprises corrugated paper and base paper 41 bonded to one side of the base paper, and the other side of the base paper is coated with a biodegradable material. Corrugated paper settings help to keep warm and strengthen the cup structure.

As an optional embodiment, the corrugated paper 43 is a single corrugated paper, double corrugated paper, cross paper or S tile paper;

As an alternative embodiment, the side of the cup body 1 is provided with two handles 3, and the two handles 3 are symmetrically arranged in the width direction of the cup body 1, and any of the handles 3 are related to the handle 3 The connecting portion of the cup body 1 is rotated, and when the biodegradable coated paper cup is not used, the handle 3 is attached to the cup body 1 when the biodegradable coated paper cup is used. The handle 3 is in a deployed shape. The handle is arranged to facilitate the user to move the cup with hot water to avoid burns. When the handle is not in use, it can be folded with the cup, and multiple paper cups can be stacked to save space.

As an alternative embodiment, the cup bottom 2 is circular, the periphery of the round cup bottom 2 extends outwardly from the annular rib 21, and the outer surface of the cup bottom 2 is coated with a waterproof coating 42. . The cup bottom 2 is provided with a circular rib 21, which can reduce the contact area between the cup and the table top, and the waterproof coating is disposed so that the paper cup is not easily damaged and deformed when placed in an environment such as a table top with water.

As an optional embodiment, the substrate of the cup body 1 comprises corrugated paper and a base paper 41, the corrugated The base paper is adhered to both sides of the paper, and the inner and outer surfaces of the cup body 1 and the cup bottom 2 are formed with the coating of the biodegradable material. The outer surface is provided with the coating of the biodegradable material, so that the durability of the paper cup is higher, and the paper cup is not easily damaged and deformed when placed in an environment such as a table with water.

As an alternative embodiment, the outer surface of the cup body 1 and the cup bottom 2 is also provided with the biodegradable material coating.

A method for preparing a biodegradable coated paper cup, comprising the steps of:

Coating step: coating a surface of the base paper 41 with a biodegradable material coating by a casting method;

The laminating process mainly uses the laminating machine. The working principle of the laminating machine: the conventional laminating machine is mainly composed of four modules, which are the main machine, the mirror roller system, the discharging system and the winding system. The unit uses biodegradable material coating particles, additives, etc., adopts a cast flat film extrusion coating process, and is coated or laminated by extrusion molding and roll paper to improve the strength and compactness of the material.

Corrugating step: the surface of the base paper 41 is coated with the biodegradable material coated with the corrugated paper 43; the corrugated paper is a board formed by bonding the corrugated paper and the corrugated paper formed by the corrugated stick, generally divided into For single corrugated or double corrugated paper, cross paper or S tile, coarse tile or fine tile. Thereby increasing the anti-skid coefficient and improving the heat insulation effect.

Forming step; cutting the paper cup into a paper cup shape. The equipment used in the forming step is a die-cutting/punching machine and a paper cup forming machine. The working principle of the die-cutting/punching machine is to use a steel plate, a metal mold and the like to apply a certain pressure to the printing plate or the paperboard by pressing the plate. The cup shape paper cut into a certain shape; the die cutting/punching process parameters are shown in Table 5; the paper cup forming process of the biodegradable coated paper cup single coating film medium speed forming cup machine is shown in Table 6.

Paper cup forming machine working principle The paper cup forming machine is a kind of paper container which is made by mechanically processing and bonding biodegradable coated paper cup paper. The appearance is in the shape of a cup. The forming process of the paper cup is shown in Table 7. The type test indicators and results of the degraded coated paper cup are shown in Table 8.

Table 5 Die cutting / punching process parameters

Table 6 paper cup forming process of biodegradable coated paper cup single coating film coating medium speed forming cup machine

Table 7 paper cup forming process of single layer hot medium speed forming cup machine

Table 8 Type biodegradable coated paper cup type test indicators and results

Supplementary note: its coated paper cup: 1 explosion 2 oval 3 size 4 mouth 5 upper 6 middle 7 lower 8 joint 9 bottom and other indicators are in line with relevant standards, and there is no 1 bottom 2 embossing 3 foaming 4 inside and outside Stain phenomenon.

As an alternative embodiment, a step of printing is further included between the corrugating step and the forming step, the printing step being printing a pattern or indicia on the outer surface of the paper cup.

Table 9 printing process parameters

Degradation experiment:

The biodegradable coated paper cup paper of the invention (base paper 120um, biodegradable material coating 20um) degradation conditions: buried in the soil, 50 ° C, humidity 90%, timed sampling, the breaking strength decreases after 2 weeks, After 4 weeks, it degraded into small fragments and completely degraded in 4 months.

Advantages of the biodegradable coated paper cup of the present invention include:

1 good impact resistance and plasticity;

2 line speed > 300 m / min;

3 stable and small amount of shrinkage;

4 excellent paper adhesion and heat seal strength, can achieve low temperature heat sealing;

5 is thinner than other bio-based materials;

6 high heat resistance, suitable for hot food service (up to 100 ° C), and has the compatibility of natural fibers;

7 degradable at room temperature;

8 can be recycled and recycled by paper mills.

The above is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope of the present invention. It should be covered by the scope of the present invention. Therefore, the scope of the invention should be determined by the scope of the appended claims.

Claims

A biodegradable coated paper cup, comprising a cup body (1) and a cup bottom (2), the cup bottom (2) being connected at a lower end of the cup body (1), the cup body (1) The space between the inner surfaces of the cup bottom (2) can accommodate liquid, and the edge of the upper end of the cup body (1) forms an opening (11); the cup body (1) and the cup bottom (2) are each A substrate and a biodegradable material coating are formed, the biodegradable material coating forming an inner surface of the cup body (1) and the cup bottom (2).
The biodegradable coated paper cup according to claim 1, wherein the biodegradable waterproof material is polybutylene succinate.
The biodegradable coated paper cup according to claim 1, wherein the biodegradable waterproof material is a mixture of polybutylene succinate, an antioxidant, and a release agent.
The biodegradable coated paper cup according to claim 1, characterized in that the outer surface of both the cup body (1) and the cup bottom (2) is also coated with the biodegradable material coating.
The biodegradable coated paper cup according to claim 1, wherein the substrate of the cup body (1) comprises corrugated paper and base paper (41), and the corrugated paper is adhered to one side of the base paper. The other side of the base paper is coated with a biodegradable material.
The biodegradable coated paper cup according to claim 5, wherein the corrugated paper (43) is a single corrugated paper, a double corrugated paper, a cross paper or a S tile;
The biodegradable coated paper cup according to claim 5, characterized in that the side of the cup body (1) is provided with two handles (3), and the two handles (3) are in the cup body (1) Symmetrically disposed in the width direction, any of the handles (3) being rotated about a connection portion of the handle (3) and the cup body (1), when the biodegradable coated paper cup is not used, A handle (3) is attached to the cup body (1), and the handle (3) is in a deployed shape when the biodegradable coated paper cup is used.
The biodegradable coated paper cup according to claim 5, wherein the cup bottom (2) is circular, and the periphery of the circular cup bottom (2) extends outwardly from the annular rib ( 21), the outer surface of the cup bottom (2) is coated with a waterproof coating (42).
A method for preparing a biodegradable coated paper cup according to any one of claims 1-8, comprising the steps of:

Laminating step: coating a surface of the base paper (41) with a biodegradable material by a casting method;

Corrugating step: bonding the surface of the base paper (41) coated with the biodegradable material to the corrugated paper (43);

Forming step; cutting the paper cup into a paper cup shape.
The method of preparing a biodegradable coated paper cup according to claim 9, wherein the corrugating step and the forming step further comprise a printing step of printing a pattern on the outer surface of the paper cup Or mark.