Natural color paper cup paper

Abstract

The invention relates to the technical field of papermaking, in particular to unbleached cup paper which comprises a surface layer, a core layer and a bottom layer which are sequentially arranged from top to bottom. The surface layer and the bottom layer are made of unbleached chemical pulp, and the pulp comprises 75-85% of NUKP and 15-25% of LUKP; and the pulp of the core layer comprises the following components in percentage by weight: 0-8% of NUKP, 0-10% of LUKP, 60-70% of self-pulping pulp and 30-40% of broken paper pulp. The pollution of the raw materials to the environment in the preparation process is reduced, and the method is suitable for the fields of double-cattle food cards, take-out packaging, meal boxes, square bowls and the like.

Description

Technical Field

[0001] The invention relates to the technical field of papermaking, and in particular to a natural color paper cup paper. Background Art

[0002] With the development of society and the implementation of the "plastic ban", more and more disposable paper cups and other paper products have replaced plastic products and entered people's lives. Currently, white paper cups made of bleached pulp are widely used. They have good printing effects. The disadvantage is that the bleaching process of the raw materials is highly polluting and is not environmentally friendly. Summary of the invention

[0003] The purpose of the present invention is to provide a natural color paper cup paper in view of the defects and shortcomings of the prior art. By using natural color pulp, the environmental pollution of raw materials during the preparation process is reduced. The present invention is suitable for the fields of Shuangniu food cards, take-out packaging, lunch boxes, square bowls, etc.

[0004] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: it comprises a surface layer, a core layer and a bottom layer which are arranged in sequence from top to bottom; the surface layer and the bottom layer are both made of unbleached chemical pulp, and the pulp ratio is 75-85% NUKP and 15-25% LUKP; the pulp ratio of the core layer is 0-8% NUKP, 0-10% LUKP, 60-70% homemade pulp and 30-40% damaged paper pulp.

[0005] Preferably, the surface layer and the bottom layer are both made of unbleached chemical pulp, and the pulp ratio is 75-80% NUKP and 20-25% LUKP.

[0006] Preferably, the core layer pulp ratio is 0-5% NUKP, 0-8% LUKP, 60-65% homemade pulp and 35-40% broke pulp.

[0007] Preferably, the freeness of NUKP and LUKP is controlled at 330-370 ml.

[0008] Preferably, the freeness of the broken pulp is controlled at 280-320 ml.

[0009] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention provides a natural color paper cup paper, which reduces the environmental pollution of raw materials during the preparation process by using natural color pulp, and is suitable for Shuangniu food cards, takeaway packaging, lunch boxes, square bowls and other fields. DETAILED DESCRIPTION

[0010] The technical solution of the present invention is described clearly and completely below, and the preferred embodiments in the description are only used as examples. All other embodiments obtained by those skilled in the art without making any creative work are within the scope of protection of the present invention.

[0011] Embodiment 1:

[0012] This embodiment includes a surface layer, a core layer and a bottom layer which are arranged in sequence from top to bottom; the surface layer and the bottom layer are made of unbleached chemical pulp, and the pulp ratio is 80% NUKP and 20% LUKP; the pulp ratio of the core layer is 2% NUKP, 3% LUKP, 60% homemade pulp and 35% broken paper pulp; the freeness of NUKP and LUKP is controlled at 330-370ml; the freeness of broken paper pulp is controlled at 280-320ml.

[0013] The preparation process of this embodiment is divided into a pulping section and a papermaking section; the pulping section is: dry pulp → pulper → unloading tower → knocking front pool → pulper → buckling rear pool → pulp mixing pool → pulp forming pool → flow conveying → wire section; the papermaking section is: wire section → pressing → front drying → gluing → rear drying → hard calendering → coating → soft calendering → winding; in the pulp papermaking section: when the mesh is dehydrated, the core layer flow box shakes with an amplitude of 10mm and a frequency of 500 times / min; the speed difference of the three-layer pulp mesh is +11, +3, -1m / min; the first pressing pressure is 75KN / m, the second pressing pressure is 750KN / m, and the third pressing pressure is 45KN / m; when gluing, the glue amount on the front side is 1.5gsm, and the glue amount on the back side is 2.0gsm; the hard calendering pressure is 30KN / m.

[0014] Embodiment 2:

[0015] This embodiment includes a surface layer, a core layer and a bottom layer arranged in sequence from top to bottom; the surface layer and the bottom layer are both made of unbleached chemical pulp, and the pulp ratio is 75% NUKP and 25% LUKP; the pulp ratio of the core layer is 5% NUKP, 60% homemade pulp and 35% broken paper pulp; the freeness of NUKP and LUKP is controlled at 330-370ml; the freeness of broken paper pulp is controlled at 280-320ml. The pulping section is as follows: dry pulp → pulper → discharge tower → front pool → pulper → rear pool → pulp blending pool → pulping pool → flow conveying → wire section; the papermaking section is as follows: wire section → pressing → front drying → gluing → rear drying → hard calendering → coating → soft calendering → winding; in the pulp papermaking section: when the mesh is dehydrated, the core layer flow box has a shaking amplitude of 10mm and a vibration frequency of 550 times / min; the speed difference of the three-layer pulp mesh is +11, +3, -1m / min; the pressure of the first press is 70KN / m, the pressure of the second press is 700KN / m, and the pressure of the third press is 40KN / m; when gluing, the glue amount on the front side is 1.0gsm, and the glue amount on the back side is 1.5gsm; the hard calendering pressure is 25KN / m.

[0016] Embodiment three:

[0017] This embodiment includes a surface layer, a core layer and a bottom layer arranged in sequence from top to bottom; the surface layer and the bottom layer are both made of unbleached chemical pulp, and the pulp ratio is 85% NUKP and 15% LUKP; the pulp ratio of the core layer is 5% LUKP, 60% homemade pulp and 35% broken paper pulp; the freeness of NUKP and LUKP is controlled at 330-370ml; the freeness of broken paper pulp is controlled at 280-320ml. The pulping section is as follows: dry pulp → pulper → discharge tower → front pool → pulper → rear pool → pulp blending pool → pulping pool → flow conveying → wire section; the papermaking section is as follows: wire section → pressing → front drying → gluing → rear drying → hard calendering → coating → soft calendering → winding; in the pulp papermaking section: when the mesh is dehydrated, the core layer flow box has a shaking amplitude of 10mm and a vibration frequency of 550 times / min; the speed difference of the three-layer pulp mesh is +11, +3, -1m / min; the pressure of the first press is 70KN / m, the pressure of the second press is 700KN / m, and the pressure of the third press is 40KN / m; when gluing, the glue amount on the front side is 1.0gsm, and the glue amount on the back side is 1.5gsm; the hard calendering pressure is 25KN / m.

[0018] Embodiment 4:

[0019] This embodiment includes a surface layer, a core layer and a bottom layer arranged in sequence from top to bottom; the surface layer and the bottom layer are both made of unbleached chemical pulp, and the pulp ratio is 80% NUKP and 20% LUKP; the pulp ratio of the core layer is 60% homemade pulp and 40% broken paper pulp; the freeness of NUKP and LUKP is controlled at 330-370ml; the freeness of broken paper pulp is controlled at 280-320ml. The pulping section is as follows: dry pulp → pulper → discharge tower → front pool → pulper → rear pool → pulp blending pool → pulping pool → flow conveying → wire section; the papermaking section is as follows: wire section → pressing → front drying → gluing → rear drying → hard calendering → coating → soft calendering → winding; in the pulp papermaking section: when the mesh is dehydrated, the core layer flow box has a shaking amplitude of 10mm and a vibration frequency of 550 times / min; the speed difference of the three-layer pulp mesh is +11, +3, -1m / min; the pressure of the first press is 70KN / m, the pressure of the second press is 700KN / m, and the pressure of the third press is 40KN / m; when gluing, the glue amount on the front side is 1.0gsm, and the glue amount on the back side is 1.5gsm; the hard calendering pressure is 25KN / m.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention provides a natural color paper cup paper, which is formed by composite drying of three layers of pulp. Through the pulp ratio in the present invention, the surface layer, the core layer and the bottom layer all use natural color unbleached pulp, so that the pollution in the raw material processing process is small and more environmentally friendly. It is suitable for Shuangniu food cards, take-out packaging, lunch boxes, square bowls and other fields.

[0021] For those skilled in the art, they can modify the technical solutions described in the aforementioned embodiments and make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A natural color paper cup, characterized by: It comprises a surface layer, a core layer and a bottom layer which are arranged in sequence from top to bottom; the surface layer and the bottom layer are both made of unbleached chemical pulp, and the pulp ratio is 75-85% NUKP and 15-25% LUKP; the pulp ratio of the core layer is 0-8% NUKP, 0-10% LUKP, 60-70% homemade pulp and 30-40% damaged paper pulp.

2. The natural color paper cup paper according to claim 1, characterized in that: The surface layer and the bottom layer are both made of unbleached chemical pulp, and the pulp ratio is 75-80% NUKP and 20-25% LUKP.

3. The natural color paper cup paper according to claim 2, characterized in that: The core layer pulp ratio is 0-5% NUKP, 0-8% LUKP, 60-65% homemade pulp and 35-40% broken paper pulp.

4. The natural color paper cup paper according to claim 3, characterized in that: The freeness of NUKP and LUKP is controlled at 330-370 ml.

5. The natural color paper cup paper according to claim 4, characterized in that: The freeness of the broken pulp is controlled at 280-320 ml.