A high-strength, heat-resistant and degradable straw base paper and production method thereof

Abstract

The present invention relates to a high-strength, heat-resistant and degradable straw base paper and a production method thereof. The raw materials include, by weight: 72.5 to 85 parts of plant fiber pulp, 15 to 27.5 parts of plant polylactic acid pulp or plant polylactic acid staple fibers with a diameter of less than 30 microns and a length of less than 5 millimeters, 0.35 to 0.4 parts of AKD, and 0.5 to 0.6 parts of a wet strength agent. The plant fiber pulp, plant polylactic acid pulp or plant polylactic acid staple fibers are pulped separately, AKD is added to the pulp after sizing, and then a wet strength agent is added and mixed for a certain period of time, and then papermaking is formed, and then pressed and dehydrated, dried and dried, and then hot-pressed to form paper, and finally a high-strength, high-stiffness and water-resistant high-strength, heat-resistant and degradable straw base paper is obtained.

Description

Technical Field

[0001] The invention relates to the field of papermaking, in particular to a high-strength, heat-resistant and degradable straw base paper and a production method thereof. Background Art

[0002] Straws are commonly used as auxiliary tools for drinking beverages. Since straws entered human life, people have been exploring the development of non-plastic straws. Glass straws, stainless steel straws, silicone straws, paper straws, polylactic acid (PLA) degradable straws and other products have appeared, but these straws have not successfully replaced plastic straws due to problems such as performance or cost. In recent years, with the government's promotion of the environmental protection industry and the improvement of people's awareness of environmental hygiene and food safety, it is imperative to eliminate plastic straws.

[0003] Although in recent years pure paper straws have better strength and water resistance after adding papermaking additives, and are recyclable and easily degradable. Paper straws have already reached a certain scale and are a new generation of products that are expected to replace plastic straws in the future. However, due to the characteristics of the base paper, pure paper straws have complex processing technology, low strength, easy softening, and heat resistance, which form a bottleneck. Therefore, the base paper for producing straws has the following requirements: high strength, high stiffness, heat resistance, and easier straw processing. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a high-strength, heat-resistant and degradable straw base paper and a production method thereof, which can adjust the content of plant polylactic acid raw materials as needed and add AKD to achieve high strength, high stiffness and water resistance.

[0005] In order to achieve the above-mentioned purpose, the present invention designs a high-strength, heat-resistant and degradable straw base paper, the raw materials of which include, by weight: 72.5 to 85 parts of plant fiber pulp, 15 to 27.5 parts of plant polylactic acid pulp or plant polylactic acid staple fibers with a diameter of less than 30 microns and a length of less than 5 mm, 0.35 to 0.4 parts of AKD, and 0.5 to 0.6 parts of wet strength agent.

[0006] A further solution is that the plant fiber pulp is coniferous wood pulp and bamboo pulp, including 20 parts of coniferous wood pulp, 65 parts of bamboo pulp, 15 parts of plant polylactic acid pulp, and 2 kg of PAM dispersant per ton of paper on an absolute dry basis.

[0007] Another solution is that the plant fiber pulp is coniferous wood pulp and broadleaf wood pulp, and the base paper is a three-layer structure, with the surface layer and the bottom layer being 20 parts of coniferous pulp, 40 parts of broadleaf pulp and 40 parts of plant polylactic acid staple fibers, and the core layer being 15 parts of coniferous pulp, 70 parts of broadleaf pulp and 15 parts of plant polylactic acid staple fibers.

[0008] The production plan of the above-mentioned straw base paper is that the plant fiber pulp, plant polylactic acid pulp or plant polylactic acid staple fiber are pulped separately, AKD sizing is added after pulping, and then a wet strength agent is added and mixed for a certain period of time, and then papermaking is formed, and then it is pressed and dehydrated, dried and hot-pressed to form paper.

[0009] A further solution is that the papermaking forming uses a round screen machine or a stacked screen multi-cylinder machine, the hot pressing pressure of the hot pressing forming is not less than 40KN / m, and the hot pressing temperature is between 130±5℃ and 135±5℃.

[0010] A further solution is that a binder is added simultaneously with the AKD sizing.

[0011] The high-strength, heat-resistant and degradable straw base paper and production method designed by the present invention utilize the addition of plant polylactic acid materials to achieve performance for straw applications. At the same time, in the production method, the plant polylactic acid material and the plant fiber pulp are pulped separately, and the ratio of the two can be adjusted as needed. Even the plant fiber pulp is pulped and proportioned according to different types, so as to meet the diverse needs of the beverage industry. The obtained straw base paper can achieve high strength or strong anti-penetration effects as needed. At the same time, this straw base paper and production method also have the characteristics of relatively simple production process and good heat resistance of the product. DETAILED DESCRIPTION

[0012] The following description is made in conjunction with the preferred embodiments of the present invention. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0013] Example 1.

[0014] The straw base paper and production method described in this embodiment is a kind of straw paper used for traditional rolled tube forming. Its main required characteristics are: low basis weight, high paper strength, heat resistance, water resistance, and high stiffness.

[0015] Use coniferous wood pulp and bamboo pulp to separate the grinding and beating, the concentration is 4%, and the coniferous wood pulp beating degree is controlled to be 52±2°SR and the bamboo pulp beating degree is 28±2°SR. Plant polylactic acid pulp is beaten with a trough beater at a concentration of 1.5% for 10 minutes to form pulp. Mix and prepare the pulp according to the total ratio of 20% coniferous pulp + 65% bamboo pulp + 15% polylactic acid pulp. Add AKD according to the ratio of 0.35% of the total fiber pulp for sizing. In the pulping tank, add 0.6% wet strength agent and mix for 45 minutes, and then continuously add the diluted PAM dispersant through the high-level box. The amount of PAM dispersant is absolute dry per ton of paper / 2kg. The upper round wire paper machine is used for papermaking and forming. After pressing and dehydration, it enters the drying cylinder for drying. After drying, it is heat-set in the hot pressing setting machine to form paper. The temperature of the hot setting cylinder is controlled to be 135±5℃, and the hot pressing line pressure is not less than 40KN / m to form paper.

[0016] Example 2.

[0017] This embodiment describes a straw base paper and production method for thermal bonding forming, and its main required characteristics are: relatively high quantitative, good anti-penetration, heat resistance, high strength and stiffness, and good thermal bonding effect.

[0018] The three-layer net is used to beat and mix the pulp according to the forming method of the surface, core and bottom layer according to the pulping method of the surface, bottom layer and core layer pulp. The plant fiber pulp uses coniferous wood pulp and broadleaf pulp, and they are beaten separately. Among them, the coniferous wood pulp is beaten at a concentration of 4.5%, and the beating degree is controlled at 55±2°SR; the broadleaf pulp is controlled at a beating degree of 30±2°SR. The plant polylactic acid pulp short fiber trough beater is beaten at a concentration of 1.2% for 25 minutes to form a pulp. The surface and bottom pulps are mixed and mixed according to the ratio of 20% coniferous pulp + 40% broadleaf pulp + 40% polylactic acid fiber in the total amount of the surface and bottom layers. The core layer is mixed and mixed according to the ratio of 15% coniferous pulp + 70% broadleaf pulp + 15% polylactic acid fiber in the total amount of the core layer. Modified AKD and binder are added to the surface, bottom and core layers at a ratio of 0.4% of the total fiber pulp for sizing. In the pulp mixing tank, 0.5% wet strength agent is added and mixed for 40 minutes. Then after dilution, the paper is formed on a stacked-net multi-cylinder papermaking machine. After pressing and dehydration, it enters a multi-cylinder drying machine for hot pressing and shaping into paper. The hot pressing temperature is controlled at 130±5℃, and the hot pressing line pressure is not lower than 50KN / m to form paper.

[0019]

[0020] The above table shows the test data of the straw base paper obtained in the two embodiments. From the test data, it can be seen that the performance of the straw base paper obtained by the present invention meets the required index range.

[0021] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for producing high-strength, heat-resistant and degradable straw base paper, characterized by: Ingredients include: Plant fiber pulp, plant polylactic acid staple fibers with a diameter of less than 30 microns and a length of less than 5 mm, AKD and wet strength agent; The base paper is a three-layer structure, and a triple-layer net is used to form the surface, core and bottom layers, and the pulp is prepared according to the pulping method of the surface, bottom layer and core layer pulp. The plant fiber pulp adopts coniferous wood pulp and broadleaf pulp, and is pulped separately, wherein the coniferous wood pulp is pulped at a concentration of 4.5%, and the beating degree is controlled at 55±2ºSR; the broadleaf pulp is controlled at a beating degree of 30±2ºSR; the plant polylactic acid staple fiber is pulped at a concentration of 1.2% in a trough-type beating machine for 25 minutes; the surface and bottom pulps are respectively 20% coniferous pulp + 40% broadleaf pulp + 40% polylactic acid fiber of the total surface and bottom layers. The pulp is mixed in proportion; the core layer is mixed in the proportion of 15% coniferous pulp + 70% broadleaf pulp + 15% polylactic acid fiber of the total core layer; AKD and adhesive are added to the surface, bottom and core layers at a ratio of 0.4% of the total fiber pulp for sizing; in the pulp mixing tank, 0.5% wet strength agent is added and mixed for 40 minutes; after dilution, the paper is formed on a stacked network multi-cylinder papermaking machine, and after pressing and dehydration, it enters the multi-cylinder drying and then is hot-pressed and set in a hot-pressing setting machine to form paper, the hot-pressing temperature is controlled at 130±5℃, and the hot-pressing line pressure is not less than 50kN / m to form paper.

Images