阅读说明：本技术 制备一次性纸制品使用可堆肥可生物降解材料印刷的工艺 (Process for making disposable paper articles using compostable biodegradable material printing ) 是由 洪涛 于 2019-03-25 设计创作，主要内容包括：本发明公开了一种制备一次性纸制品使用可堆肥可生物降解材料印刷的工艺,其包括如下步骤：使用含有可堆肥可生物降解材料作为印刷胶直接印刷,先按目标区域印刷一层膜；再在所述膜上印刷图案和/或文字；或者先印刷图案和/或文字,再使图案和/或文字位于目标区域内,在目标区域印刷一层膜。本发明减少50％以上工艺,减少投资成本,提高效率,降低成本,节省纸张,提升空间利用率。(The invention discloses a process for preparing disposable paper products by printing compostable biodegradable materials, which comprises the following steps: directly printing by using a biodegradable material containing compostable materials as a printing adhesive, and firstly printing a layer of film according to a target area; printing patterns and/or characters on the film; or printing patterns and/or characters, then enabling the patterns and/or characters to be located in the target area, and printing a layer of film in the target area. The invention reduces the process by more than 50 percent, reduces the investment cost, improves the efficiency, reduces the cost, saves paper and improves the space utilization rate.)

1. A process for making disposable paper products printed using compostable biodegradable materials, comprising the steps of:

directly printing by using a biodegradable material containing compostable materials as a printing adhesive, and firstly printing a layer of film according to a target area; printing patterns and/or characters on the film; or printing patterns and/or characters, then enabling the patterns and/or characters to be located in the target area, and printing a layer of film in the target area.

2. The process of making a disposable paper product for printing with compostable biodegradable material as in claim 1 wherein the compostable biodegradable material comprises one or a combination of PLA, PBS and PBAT.

3. The process for the preparation of disposable paper products printed with compostable biodegradable material according to claim 2, characterized in that the printing glue is prepared as follows: adding water or organic solvent into the compostable biodegradable materials, fully stirring and mixing to process into liquid or semi-liquid state, and preparing the printing glue with the compostable biodegradable materials content of 50-80 wt%.

4. The process of claim 3 for making a disposable paper product printed using compostable biodegradable material wherein the organic solvent is ethyl lactate, methyl lactate or a mixture thereof.

5. The process for preparing disposable paper products printed with compostable biodegradable materials according to claim 1, characterized in that the direct printing is intaglio printing, letterpress printing, offset printing or screen printing.

6. A disposable paper product characterized in that it is prepared by the process of preparing a disposable paper product according to claim 1 using printing of compostable biodegradable materials.

7. The disposable paper product of claim 1 wherein the disposable paper product comprises a paper cup and/or a paper lid.

Technical Field

The invention relates to a process for preparing paper cups by printing compostable biodegradable materials.

Background

The compostable biodegradable materials are more commonly polylactic acid (PLA), which has many uses due to its good biodegradability and versatility. Some of the most common uses include plastic films, bottles and biodegradable medical devices (such as screws, needles, rods and plates, which are expected to biodegrade within 6-12 months). Polylactic acid shrinks by heat and is therefore suitable as a shrink wrap material. On the other hand, its low glass transition temperature makes many types of polylactic acid (e.g. plastic cups) unsuitable for containing hot liquids. However, when the polylactic acid is combined with the paper cup, the polylactic acid has certain capacity of containing hot liquid, because the polylactic acid is combined with the paper board after being heated and shrunk, and the paper board is firmer.

How to combine polylactic acid with paper cups. The current modes mainly comprise film coating, coating and film covering.

For example, chinese patent document CN 108797224 a discloses a method for producing a disposable paper cup, which describes: "comprises the following steps:

s1, mixing bagasse, polylactic acid, tackifying resin, isobornyl acrylate, ethyl maltol and water, stirring, and removing impurities by using a double-layer filter screen to obtain a filtrate;

s2, placing the filtrate, extruding and draining, and draining supernatant to obtain fine processing raw materials; adding the fine processing raw materials onto a die, and carrying out hot pressing to obtain a paper cup primary die;

and S3, spraying a single-sided polyethylene film on the front side of the paper cup primary die by using a film spraying machine, carrying out corona treatment on the back side of the paper cup primary die, then printing a required pattern by using a printing machine, cutting the paper cup primary die into fan-shaped sheets, folding the fan-shaped sheets into a circular paper cup body, and arranging fiber cotton layers at the positions corresponding to the thumb and the middle and middle fingers which are held by hands to obtain the disposable paper cup. "

This patent document describes that a paper cup blank is made of a variety of materials including polylactic acid, and then a single-sided polyethylene film or the like is applied to the front surface of the paper cup blank by a film applicator to form a disposable paper cup.

For example, journal Shanghai Package 2018 discloses a research progress of paper-based biological composite packaging materials published by Tengyhong et al, and states that "Rhim and Kim research the characteristics of polylactic acid coated paper boards used for disposable paper cups, the polylactic acid coated paper boards are prepared by a solution coating method, and the performance of the polylactic acid coated paper boards used for disposable paper cups is tested. After the polylactic acid is coated, the tensile strength and the elongation of the paperboard are increased, the water resistance of the paperboard is improved, and the paperboard also has stronger heat sealing performance. The results show that polylactic acid coated paperboard can be used in the production of disposable paper cups instead of PE coated paper. "

The journal literature uses a solution coating process to make a polylactic acid coated paperboard to make disposable paper cups.

For example, CN106985566A discloses a method for three-dimensional printing on pulp molded products, which describes: "comprises:

selecting a polylactic acid film with a preset thickness, and printing preset graphic and text information on the polylactic acid film to form a graphic and text film;

……

after the image-text film is pasted on the preset position in the upper die separated from the lower die, the upper die and the lower die are pressed together again, the lower die is vacuumized, the image-text film is pasted on the upper surface of the product blank, and the printed product is obtained "

This patent document is to bond a polylactic acid film containing graphic information to a product.

At present, polylactic acid is combined on a paperboard, and the defects of material waste, thicker thickness and more complicated process steps exist no matter the paperboard is coated, coated or laminated. For example, with a film coating process, the entire material of the polylactic acid film is polylactic acid, and the thickness of the polylactic acid film is generally thicker; a coating process is used, which typically coats the entire sheet of paper or paperboard.

More importantly, for example, the chinese patent document CN 108797224 a discloses a method for manufacturing a disposable paper cup, in which a single-sided polyethylene film is coated on the front surface of a paper cup blank by a coating machine, … … is printed with a desired pattern by a printer, and the desired pattern is printed by a printer after the coating by the coating machine. That is, at least two processes are required: and (5) laminating and printing.

For another example, in "research progress of paper-based biological composite packaging material", after coating polylactic acid on a paperboard with a solution, if a logo or other patterns need to be added, a printer is still required for printing, and at least two processes are still required: coating and printing.

Further, for example, CN106985566A discloses a method for three-dimensional printing on a pulp molded product, which comprises printing graphic information and then coating a film. At least two processes are still required: laminating and printing.

Therefore, in the prior art, no matter the film is coated, coated or laminated, a printing process is needed to prepare the disposable paper cup with the pictures and texts.

Disclosure of Invention

In view of the above, the present invention provides a process for printing compostable biodegradable materials for preparing disposable paper products, which saves process steps and improves production efficiency, and the paper cup prepared by the process has reduced thickness, reduced material consumption and reduced cost.

The adopted technical scheme is as follows:

a process for making disposable paper products printed using compostable biodegradable materials comprising the steps of:

directly printing by using a biodegradable material containing compostable materials as a printing adhesive, and firstly printing a layer of film according to a target area; printing patterns and/or characters on the film; or printing patterns and/or characters, then enabling the patterns and/or characters to be located in the target area, and printing a layer of film in the target area.

Further, the compostable biodegradable material comprises one or a combination of PLA, PBS and PBAT.

Further, the preparation method of the printing glue comprises the following steps: adding water or organic solvent into the compostable biodegradable materials, fully stirring and mixing to process into liquid or semi-liquid state, and preparing the printing glue with the compostable biodegradable materials content of 50-80 wt%.

Further, the organic solvent is ethyl lactate, methyl lactate or a mixture thereof.

Further, the direct printing is gravure printing, letterpress printing, offset printing or screen printing.

As another aspect, the present invention accordingly provides a disposable paper product made by the above-described protocol using a process of printing compostable biodegradable material.

Further, the disposable paper product includes a paper cup and/or a paper lid.

The invention has the beneficial effects that:

taking a disposable paper product as a paper cup as an example, a printer is used on a paperboard, compostable biodegradable materials are used as printing glue for direct printing to form protective films inside or outside the paper cup paper, after the paper cup is manufactured, the direct contact between the paper and liquid is isolated, the use function of the paper cup is achieved, the environment-friendly degradation function under the composting condition can be achieved, the traditional paper cup is distinguished from the paper cup formed by Polyethylene (PE) film coating, coating and laminating on the paper cup paper, and the function of the paper cup is achieved but the environment-friendly degradation function cannot be achieved.

The process of the invention is different from other processing modes such as film coating, film covering and the like: the normal process is to meet the requirement of environment-friendly degradation of paper cups, the compostable biodegradable materials are combined with paper in a film spraying, coating or laminating mode and then printed, at least more than two machines are needed for finishing, namely, the compostable biodegradable materials are combined with the paper through a film spraying machine or a coating machine or a laminating machine, and then the printing processing of the paper cups is finished through a printer; or after the paper cup paper pattern is printed by the printer, the compostable biodegradable material is combined with the paper cup paper by the laminating machine or the coating machine or the laminating machine. The process of the invention combines the compostable biodegradable materials with the paper and prints the pictures and texts at one time only by one printer, prints the designed pictures and texts and then prints the compostable biodegradable materials, and also prints the compostable biodegradable materials and then prints the designed pictures and texts, namely the printing sequence is not limited. Thus, the process has the advantages that: the process is reduced by more than 50%, the investment cost is reduced, the efficiency is improved, the cost is reduced, paper is saved, and the space utilization rate is improved.

Drawings

The drawings needed for the embodiments will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained by those skilled in the art without inventive exercise.

Fig. 1 is a schematic view of selectively printing a portion to be printed when a paper cup is prepared.

FIG. 2 is a schematic view of the structure of the apparatus for flexographic plate making.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only preferred embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.