阅读说明：本技术 一种无塑餐具包装纸的生产设备及工艺 (Production equipment and process of plastic-free tableware packaging paper ) 是由 朱忠凯 于 2020-05-20 设计创作，主要内容包括：本发明公布了一种无塑餐具包装纸的生产设备及工艺,属于造纸技术领域,包括使用针叶木浆、阔叶木浆、漂白竹浆经混合打浆、配浆及辅料加入、湿纸页抄造、前干燥、涂布施胶(PVA)、后干燥等工艺步骤。本发明通过对浆料选择、浆料配比、打浆工艺、浆内添加的功能化学助剂等进行研究,采用机内膜转移表面施胶处理,制造出合格的无塑餐具包装纸。本发明一次成型的无塑餐具包装纸具有综合成本低,竞争力强,环保易回用等优点,试制产品投放市场获用户高度评价,其经济、环保及社会效益十分显著。(The invention discloses production equipment and a process of plastic-free tableware packing paper, which belong to the technical field of papermaking and comprise the process steps of using softwood pulp, hardwood pulp and bleached bamboo pulp to carry out mixing and pulping, preparing pulp and adding auxiliary materials, papermaking wet paper, pre-drying, coating and gluing (PVA), post-drying and the like. The qualified plastic-free tableware packing paper is manufactured by researching the selection of the sizing agent, the proportioning of the sizing agent, the pulping process, the functional chemical auxiliary agent added in the sizing agent and the like and adopting the surface sizing treatment of the transfer of the inner film of the machine. The one-step formed plastic-free tableware packaging paper has the advantages of low comprehensive cost, strong competitiveness, environmental protection, easy recycling and the like, trial-manufactured products are put on the market to obtain high evaluation of users, and the economic, environmental protection and social benefits are very obvious.)

1. A production device of plastic-free tableware packing paper comprises a cross-mixing beater (1), a papermaking machine (4), a front dryer (6), a double-sided coating sizing machine (7) and a rear dryer (9), and is characterized in that the mixing beater (1) is of a two-stage beating structure, a group of driving beating devices in a first beating box body (105) of the mixing beater drives two groups of driven beating devices, materials in the first beating box body (105) flow into a second beating box body (118) which is obliquely arranged, the driving beating devices in the second beating box body (118) drive a stirring device below to stir, the materials flow into a material conveying pipe (3) from a second discharge port (112) of the second beating box body (118) and are conveyed to the papermaking machine (4) through a material conveying pump (2) to carry out a conventional procedure of wet paper sheet papermaking, and are conveyed to the front dryer (6) through a first conveying belt (5) to be dried after completion, the front dryer (6) comprises a front drying box body (615) with a front opening and a rear opening, hot air drying devices are symmetrically arranged in the front drying box body (615) from top to bottom, semi-finished paper (607) is positioned between the upper hot air drying device and the lower hot air drying device and is conveyed through a roller (613), the material passing through the front dryer (6) is conveyed to a double-sided coating sizing machine (7) for coating and sizing, and is conveyed to a rear dryer (9) through a second conveying belt (8) after finishing, the rear dryer (9) comprises a rear drying box body (913) with a front opening and a rear opening, a conveyor belt (909) is arranged at the lower part in the rear drying box body (913), a silicon rubber electric heating plate (908) is attached to the conveyor belt (909) to realize heating and drying of the bottom surface of the material while conveying the material, and a hot air drying device is arranged at the inner upper part of the rear drying box body (913), and the material subjected to the rear drying process is a finished product.

2. The plastic-free tableware packaging paper production equipment according to claim 1, wherein the driving beating device in the first beating box body (105) comprises a first main shaft (104) which is vertically arranged, the first main shaft (104) is driven by a first motor (102) on the top cover of the first beating box body (105), first beating blades (106) and first stirring blades (108) are arranged on the first main shaft (104) in a staggered mode, a driving gear (125) is arranged on the first main shaft (104), and the driving gear (125) drives driven beating devices on two sides.

3. The production equipment of the plastic-free tableware packing paper according to any one of the claims 1 or 2, wherein the driven beating device comprises a first driven shaft (109), the upper end and the lower end of the first driven shaft (109) are installed in a first bearing (110) so as to be vertically installed in a first beating box body (105), the first driven shaft (109) is also provided with first beating blades (106) and first stirring blades (108) in a staggered mode, a driven gear (107) is arranged on the first driven shaft (109), and the driven gear (107) is meshed with a driving gear (125), so that the first driven shaft (109) is driven to rotate by the rotation of a first main shaft (104).

4. The plastic-free tableware packing paper production equipment according to claim 1, wherein the active beating device in the second beating box body (118) comprises a second main shaft (111), the second main shaft (111) is installed at the upper part of the second beating box body (118), the upper part of the second beating box body (118) is of a rectangular box body structure, the lower part of the second beating box body is semicircular, one end of the second main shaft (111) is connected to an output shaft of a second motor (123) at the outer side of the second beating box body (118), second beating blades (113) are arranged on the second main shaft (111) in a row, a turntable (122) is arranged on the second main shaft (111), wavy limiting grooves (126) are formed in the turntable (122) in an annular array, a stirring device is arranged below the second main shaft, the stirring device comprises a second driven shaft (115) installed at the lower part of the second beating box body (118) through a second bearing (114), second stirring blades (117) are arranged on the second driven shaft (115), a plurality of connecting plates (127) are arranged on the second driven shaft (115) in an annular array mode, limiting columns (121) are arranged at the tail ends of the connecting plates (127), the limiting columns (121) can slide in limiting grooves (126), and the rotary disc (122) rotates to drive the limiting columns (121) to sequentially pass through the limiting grooves (126) to drive the second driven shaft (115) to rotate, so that stirring at the bottom is achieved.

5. The plastic-free tableware packing paper production equipment according to claim 1, wherein the hot air drying device arranged in the front drying box body (615) in a vertically symmetrical manner comprises an upper hot air drying device and a lower hot air drying device, the upper hot air drying device comprises a first sandwich plate (605) connected to the side wall, the first sandwich plate (605) is arranged at the upper part, the front side and the rear side of the first sandwich plate have gaps with the inner wall to realize the circulation of air, a first hot air through pipe (616) is arranged in the sandwich layer of the first sandwich plate (605), the first hot air through pipe (616) is communicated with a first hot air blower (602) arranged outside, the other end of the first hot air through pipe (616) is communicated with a first hot air blowing opening (606), the first hot air blowing opening (606) is of a shower nozzle structure in an inclined manner and is arranged below the first sandwich plate (605), and the blowing direction is opposite to the incoming material direction, a first temperature and humidity detector (603) is arranged in the middle of the first hot air blowing port (606); the lower hot air drying device comprises a second interlayer plate (609) connected to the lower portion, and a second hot air blowing opening (608) and a second temperature and humidity detector (611) on the second interlayer plate (609) are symmetrically arranged with the upper hot air drying device.

6. The apparatus for producing a plastic-free tableware wrapping paper according to claim 1, wherein a first suction fan (601) is provided at a top cover of the front drying box body (615), the first suction fan (601) is communicated with a first suction opening (614) provided at an upper portion of the front drying box body (615), and a first electric heating tube (604) and a second electric heating tube (612) are respectively arranged at a top plate and a bottom plate of the front drying box body (615).

7. The production apparatus of plastic-free tableware wrapping paper as claimed in claim 1, the hot air drying device at the upper part in the rear drying box body (913) comprises a third sandwich plate (906) connected to the side wall, the third sandwich plate (906) is arranged at the upper part, gaps are formed between the front side and the rear side of the third sandwich plate (906) and the inner wall of the third sandwich plate to realize the circulation of air, a second hot air through pipe (902) is arranged in the interlayer of the third sandwich plate (906), the second hot air through pipe (902) is communicated with a third hot air blower (903) arranged outside, the other end of the third hot air through pipe (903) is communicated with a third hot air blowing opening (911), the third hot air blowing opening (911) is of a shower-shaped nozzle structure which is obliquely arranged below the third sandwich plate (906), the blowing direction of the hot air blowing device is opposite to the incoming material direction, and a third temperature and humidity detector (904) is arranged in the middle of a third hot air blowing opening (911); a second exhaust fan (901) is arranged on the top cover of the rear drying box body (913), the second exhaust fan (901) is communicated with a second air suction opening (912) which is arranged at the upper part in the rear drying box body (913), and a third electric heating pipe (905) is arranged on the top plate of the rear drying box body (913).

8. The process for producing plastic-free tableware packaging paper according to claim 1, comprising the steps of mixing and pulping softwood pulp, hardwood pulp and bleached bamboo pulp, adding pulp and auxiliary materials, making wet paper, pre-drying, coating and sizing, and post-drying, wherein the steps comprise:

A. (1) mixing 30-40% of softwood pulp, 70-50% of hardwood pulp and 0-10% of bamboo pulp by weight;

B. beating degree of mixed pulp: 50-55 DEG SR;

C. the dosage of the auxiliary materials to the oven-dried pulp is as follows: (a) 1.0-1.5% of AKD (alkyl ketene dimer), 0.5-1.0% of wet strength agent, 0.8-1.1% of wet strength agent addition point, 0.05-0.1% of cationic starch, 0.05-0.1% of retention aid and 10-18% of filler;

D. a glue application part: PVA is used for the front side, the boiling concentration is 8-9%, the gluing concentration is 3.8-4.2%, and the type of the metering rod is as follows: 21#, the pressure of a metering rod is 80KPa, the sizing flow rate of upper roll is 1050L/min, and the single side is controlled to be 1.0-1.5 g/m2, so that the coating weight is ensured to be 20-30 Kg/ton of paper. And (3) using PVA and a water repellent agent for the reverse side, wherein the boiling concentration is 8-9%, the gluing concentration is 3.8-4.0%, the single side is controlled at 0.5-1.0 g/m2, the coating weight is ensured to be 10-15 Kg/ton of paper, and the type of a metering rod is as follows: 18#, the pressure of a measuring rod is 100KPa, the sizing flow of a lower roller is 850L/min, the tension of a front paper sheet of a sizing part is 200-220N/m 2, and the tension of a rear paper sheet of the sizing part is 180-200N/m 2;

E. other parameters of the paper machine are as follows: the concentration of the upper slurry is as follows: 0.4-0.6%, the wire speed is 400m/min, the opening of a lip plate of a head box is 9.7mm, and the first line pressing pressure is as follows: 880-900 KN/m, two-line pressure: 880 to 900KN/m, crimp tension: 380-410 KN/m;

F. soft calendering conditions: a two-nip pressure, a hot roll temperature of 100-1300C, a linear pressure of 50-100 kN/m

G. Quantifying the plastic-free tableware packaging paper: 38-80 g/m2, 5.0-7.0% of water, white color, food grade, longitudinal breaking length of more than or equal to 6.0Km, water absorption of 22-28 g/m2, tightness of less than or equal to 0.8g/m2, air permeability of less than or equal to 120mL/min, front surface smoothness of 30-50 seconds, back surface smoothness of 60-80 seconds, transverse expansion rate of less than or equal to 3.0%, stable thickness, good paper evenness and good smoothness.

9. The apparatus and process for producing plastic-free tableware wrapping paper as claimed in claim 8, wherein PVA (polyvinyl alcohol) is used for front sizing in said step D, and the front side can be directly packed and bonded by heating.

10. The production equipment and process of the plastic-free tableware wrapping paper according to claim 8, characterized in that the reverse side in the step D adopts the surface sizing PVA + the water repellent agent, so that the paper has good waterproof effect, and the reverse side can be used for printing before tableware packaging.

Technical Field

The invention relates to the technical field of papermaking, in particular to production equipment and a process of plastic-free tableware packing paper.

Background

The plastic-free tableware packing paper is food-grade packing paper, for a long time, disposable chopsticks, spoons, straws, toothpicks, tableware packages and other plastic OPP and paper-plastic composite products which are used in large quantity are used, because plastics are extremely difficult to degrade and plastic garbage is difficult to treat, the tableware is packaged in large quantity by using the plastics, resource waste and environmental pollution are easily caused, and the disposable plastic tableware and waste packing materials thereof are one of the main sources of white pollution at present. The invention or the development of the plastic-free tableware packaging paper is a great trend, the plastic-free tableware packaging paper is mainly used for manufacturing OPP and paper-plastic composite products such as disposable chopsticks, spoons, straws, toothpicks, tableware bags and the like, and the biodegradable plastic-free tableware packaging paper is developed to replace plastic and paper-plastic packaging, so that the plastic-free tableware packaging paper is beneficial to building a harmonious society, becomes a main melody for the development of the packaging industry, is beneficial to promoting energy conservation and emission reduction, reducing white pollution and protecting the ecological environment.

In the prior domestic and foreign markets, food packaging paper is used as tableware packaging paper in a film spraying mode, the invention does not adopt film spraying, but adopts surface treatment (glue application) in the production occasion of a paper machine, namely, the film spraying effect is achieved by the research of PVA (polyvinyl alcohol) coating type. The PVA has the characteristics of good film forming, easy decomposition and reuse, oil resistance, water resistance and the like. Because the reverse side of the plastic-free tableware packaging paper needs to be printed, the reverse side and the reverse side can be glued by adopting different raw materials, the cost is saved, the reverse side gluing amount is small, and the paper has a good waterproof effect by adding the water repellent agent. The invention further improves the problems of different fiber thicknesses and high energy consumption of the mixing beater on the production line for a long time, and the problem that the quality of the paper is damaged due to uneven drying degree of the two sides of the paper easily occurs in the front drier and the rear drier, brings multiple beneficial effects, and optimizes the quality of the paper production while improving the production performance. The one-step formed plastic-free tableware packaging paper has the advantages of low comprehensive cost, strong competitiveness, environmental protection, easy recycling and the like, trial-made products are put on the market to be highly evaluated by users, and the economic, environmental protection and social benefits are very obvious.

Disclosure of Invention

The invention aims to solve the problems and provides production equipment and a process for plastic-free tableware packing paper, and the technical scheme adopted by the invention is as follows: a production device of plastic-free tableware packing paper comprises a mixing beater, a pulping machine, a front dryer, a double-sided coating sizing machine and a rear dryer, wherein the mixing beater is of a two-stage pulping structure, a group of driving pulping devices drives two groups of driven pulping devices in a first pulping box body, materials in the first pulping box body flow into a second pulping box body which is obliquely arranged, the driving pulping devices in the second pulping box body drive a lower stirring device to stir, the materials flow into a conveying pipe from a second discharge port of the second pulping box body and are conveyed to the pulping machine through a conveying pump to carry out a conventional procedure of wet paper sheet pulping, the materials are conveyed to the front dryer through a first conveying belt to be dried after being finished, the front dryer comprises a front drying box body with front and rear openings, hot air drying devices are symmetrically arranged in the front drying box body from top to bottom, semi-finished paper is positioned between the upper and lower hot air drying devices and is conveyed through a roller, the material through preceding desiccator is carried two-sided coating sizing applicator and is carried the coating glueing technology, carries back desiccator through the second conveyer belt after the completion, back desiccator includes front and back open-ended back drying box, and the lower part is provided with the conveyer belt in the back drying box, and the laminating is provided with silicon rubber electrical heating board on the conveyer belt and realizes carrying the material while heating and drying to the material bottom surface, the internal upper portion of back drying box is provided with hot air drying device, and the material through the after-drying process is the finished product.

Furthermore, the driving pulping device in the first pulping box body comprises a vertically arranged first main shaft, the first main shaft is driven by a first motor on a top cover of the first pulping box body, first pulping blades and first stirring blades are arranged on the first main shaft in a staggered mode, a driving gear is arranged on the first main shaft, and the driving gear drives driven pulping devices on two sides.

Further, driven making beating device includes first driven shaft, thereby both ends are installed in first bearing and are realized vertically installing in first pulping box about the first driven shaft, and the crisscross first making beating blade and the first stirring vane that is provided with of same appearance arrangement on the first driven shaft is provided with driven gear on the first driven shaft, driven gear and driving gear meshing to the rotation that realizes first main shaft drives first driven shaft and rotates.

Further, the active pulping device in the second pulping box comprises a second main shaft, the second main shaft is arranged at the upper part of the second pulping box, the upper part of the second pulping box is of a rectangular box structure, the lower part of the second pulping box is semicircular, one end of the second main shaft is connected to an output shaft of a second motor outside the second pulping box, second pulping blades are arranged on the second main shaft in an arrayed manner, a rotary disc is arranged on the second main shaft, an annular array on the rotary disc is provided with a wavy limiting groove, a stirring device is arranged below the second main shaft, the stirring device comprises a second driven shaft arranged at the lower part of the second pulping box through a second bearing, second stirring blades are arranged on the second driven shaft in an arrayed manner, a plurality of connecting plates are arranged on the second driven shaft in an annular array, the tail ends of the connecting plates are provided with limiting columns, the limiting columns can slide in the limiting grooves, the rotary disc rotates to drive the limiting columns to, thereby achieving stirring at the bottom.

Furthermore, the hot air drying devices which are arranged in the front drying box body in an up-down symmetrical mode comprise upper and lower hot air drying devices, the upper hot air drying device comprises a first interlayer plate connected to the side wall, the first interlayer plate is arranged on the upper portion, gaps are formed between the front side and the rear side of the first interlayer plate and the inner wall of the first interlayer plate so as to achieve circulation of air, a first hot air through pipe is arranged in an interlayer of the first interlayer plate and communicated with a first hot air blower arranged outside, the other end of the first hot air through pipe is communicated with a first hot air blowing opening, the first hot air blowing opening is of a shower-shaped nozzle structure which is obliquely arranged and is arranged below the first interlayer plate, the air blowing direction of the first hot air blowing opening is opposite to the material feeding direction, and a first temperature and humidity detector is arranged in the middle of the first hot; the lower hot air drying device comprises a second sandwich plate connected to the lower portion, and a second hot air blowing opening and a second temperature and humidity detector on the second sandwich plate are symmetrically arranged with the upper hot air drying device.

Furthermore, a first exhaust fan is arranged on a top cover of the front drying box body, the first exhaust fan is communicated with a first air suction opening arranged on the upper portion in the front drying box body, and a first electric heating pipe and a second electric heating pipe are respectively arranged on a top plate and a bottom plate of the front drying box body.

Furthermore, the hot air drying device at the inner upper part of the rear drying box body comprises a third interlayer plate connected to the side wall, the third interlayer plate is arranged at the upper part, gaps are formed between the front side and the rear side of the third interlayer plate and the inner wall of the third interlayer plate to realize the circulation of air, a second hot air through pipe is arranged in the interlayer of the third interlayer plate and is communicated with a third hot air blower arranged outside, the other end of the third hot air through pipe is communicated with a third hot air blowing opening, the third hot air blowing opening is of a shower nozzle structure which is obliquely arranged and is arranged below the third interlayer plate, the blowing direction of the third hot air blowing opening is opposite to the incoming material direction, and a third temperature and humidity detector is arranged in the middle of the third hot air blowing opening; and a second exhaust fan is arranged on the top cover of the rear drying box body, the second exhaust fan is communicated with a second exhaust opening arranged on the upper part in the rear drying box body, and a third electric heating pipe is arranged on a top plate of the rear drying box body.

11. In addition, the invention also discloses a production process of the plastic-free tableware packaging paper, which comprises the following steps of mixing and pulping the softwood pulp, the hardwood pulp and the bleached bamboo pulp, adding pulp and auxiliary materials, papermaking wet paper, pre-drying, coating and sizing, and post-drying, wherein the production process comprises the following steps:

A. (1) mixing 30-40% of softwood pulp, 70-50% of hardwood pulp and 0-10% of bamboo pulp by weight;

B. beating degree of mixed pulp: 50-55 DEG SR;

C. the dosage of the auxiliary materials to the oven-dried pulp is as follows: (a) 1.0-1.5% of AKD (alkyl ketene dimer), 0.5-1.0% of wet strength agent, 0.8-1.1% of wet strength agent addition point, 0.05-0.1% of cationic starch, 0.05-0.1% of retention aid and 10-18% of filler;

D. a glue application part: PVA is used for the front side, the boiling concentration is 8-9%, the gluing concentration is 3.8-4.2%, and the bar type number is measured: 21#, the pressure of a metering rod is 80KPa, the sizing flow rate of upper roll is 1050L/min, and the single side is controlled to be 1.0-1.5 g/m2, so that the coating weight is ensured to be 20-30 Kg/ton of paper. And (3) using PVA and a water repellent agent for the reverse side, wherein the boiling concentration is 8-9%, the gluing concentration is 3.8-4.0%, the single side is controlled at 0.5-1.0 g/m2, the coating weight is ensured to be 10-15 Kg/ton of paper, and the type of a metering rod is as follows: 18#, the pressure of a measuring rod is 100KPa, the sizing flow of a lower roller is 850L/min, the tension of a front paper sheet of a sizing part is 200-220N/m 2, and the tension of a rear paper sheet of the sizing part is 180-200N/m 2;

E. other parameters of the paper machine are as follows: the concentration of the upper slurry is as follows: 0.4-0.6%, the wire speed is 400m/min, the opening of a lip plate of a head box is 9.7mm, and the first line pressing pressure is as follows: 880-900 KN/m, two-line pressure: 880 to 900KN/m, crimp tension: 380-410 KN/m;

F. soft calendering conditions: a two-nip pressure, a hot roll temperature of 100-1300C, a linear pressure of 50-100 kN/m

G. Quantifying the plastic-free tableware packaging paper: 38-80 g/m2, 5.0-7.0% of water, white color, food grade, longitudinal breaking length of more than or equal to 6.0Km, water absorption of 22-28 g/m2, tightness of less than or equal to 0.8g/m2, air permeability of less than or equal to 120mL/min, front surface smoothness of 30-50 seconds, back surface smoothness of 60-80 seconds, transverse expansion rate of less than or equal to 3.0%, stable thickness, good paper evenness and good smoothness.

Further, PVA (polyvinyl alcohol) is used for front sizing in the step D, and direct packaging bonding can be realized by front heating.

Furthermore, surface glue PVA + water repellent agent is adopted on the reverse side in the step D, so that the paper has a good waterproof effect, and the reverse side can be used for printing before tableware packaging.

The invention has the beneficial effects that:

according to the invention, through research on selection of pulp, proportioning of the pulp, a pulping process, functional chemical additives added into the pulp and the like, qualified plastic-free tableware packaging paper is manufactured by adopting membrane transfer surface sizing treatment, and a wet strength agent PPE (PAV) added into the pulp is fully called polyamide polyepichlorohydrin resin, is water-soluble, cationic and thermosetting resin, does not contain formaldehyde polymers, is nontoxic and odorless, can be manufactured under neutral, slightly alkaline and acidic conditions, has a wide pH value application range, and has an addition amount determined according to the wet strength requirement of paper. The sizing agent is applied to the front side of the paper sheet by adopting PVA (polyvinyl alcohol) and 20-30 kg/ton of paper, and the sizing agent is applied to the back side by adopting a PVA + water repellent agent sizing process, wherein the coating weight is 10-15 kg/ton of paper. The requirements of water and moisture resistance inside the plastic-free tableware package and paper printing outside the plastic-free tableware package are met. The product fills the gap of the market, provides a substitute product for the implementation of the plastic limit order in China, and has important significance for optimizing the product structure and improving the profit capability of the company. Meanwhile, the invention aims at the long-standing problem of a plurality of devices on the production line to carry out targeted improvement:

1. aiming at the problems of high energy consumption, high failure rate and the like caused by the adoption of a plurality of motors of the hybrid pulping machine, a driving and driven type design is formed through a pure mechanical structure, a motor of a driven device is cancelled, and a driven pulping device is driven by a main pulping device in a first pulping box body to carry out synchronous rotation pulping operation; in the second pulping box body, in order to solve the problem that the lower material deposition leads to uneven and incomplete pulping effect, the lower part of the second pulping box body is provided with a stirring device which does not need to be driven by a motor, and a turntable is adopted to drive a limiting column to rotate so as to drive the stirring device to rotate for intermittent stirring, so that the materials are fully stirred, and the pulping is more thorough and uniform.

2. Aiming at the problem that the quality of paper is damaged due to the fact that the paper is not uniformly dried on the upper surface and the lower surface of the paper when a front dryer is used for drying, the paper is dried by arranging symmetrical hot air drying devices on the upper surface and the lower surface of the paper, the hot air temperature can be adjusted in real time by matching with a temperature and humidity detector, or air is pumped by a first exhaust fan for cooling in time, so that the drying quality is comprehensively guaranteed; and hot air forms the circulation route in box upper and lower part, and the hot-blast from hot-blast mouthpiece spun can also be heated by first electric heating pipe and second electric heating pipe at the in-process of circulation to keep the temperature of hot-blast in the box, be convenient for realize accurate control by temperature change, avoid the heat to scatter and disappear very fast simultaneously, be favorable to guaranteeing the quality of stoving processing.

3. Adopt the laminating of silicon rubber electrical heating board to set up on the conveyer belt in the desiccator of back, make full use of silicon rubber electrical heating board can make the characteristics and the advantage of arbitrary shape according to the demand, realize carrying the bottom surface of material when heating the stoving, the hot air drying device of cooperation top, realize the stoving operation in all directions, under the assistance of temperature and humidity detector, hot-blast and electric heating pipe that the circulation flows has still been formed, and the air exhauster, thereby mutually support and realize more accurate control by temperature change, gain better stoving effect, guarantee the quality of paper article.

Drawings

FIG. 1 is a schematic view of a production line of the production apparatus of the present invention.

Fig. 2 is a schematic view of the internal structure of the mixing beater of the present invention.

FIG. 3 is a schematic structural view of a second beater box of the present invention.

Fig. 4 is a schematic connection diagram of a stirring device in a second pulping box of the invention.

Fig. 5 is a schematic view of the structure of the front dryer of the present invention.

Fig. 6 is a schematic view of the structure of the after-dryer of the present invention.

The text labels in the figures are represented as: 1. mixing and beating machine; 2. a delivery pump; 3. a delivery pipe; 4. A manufacturing machine; 5. a first conveyor belt; 6. a front dryer; 7. coating a sizing machine on two sides; 8. a second conveyor belt; 9. a post-dryer; 101. a first feed port; 102. a first motor; 103. a second feed port; 104. a first main shaft; 105. a first pulping box body; 106. a first beating blade; 107. a driven gear; 108. a first stirring blade; 109. a first driven shaft; 110. a first bearing; 111. a second main shaft; 112. a second discharge port; 113. a second beating blade; 114. a second bearing; 115. a second driven shaft; 116. a first discharge port valve; 117. a second stirring blade; 118. a second pulping box body; 119. a feeding hole of the second pulping box body; 120. a second support frame; 121. a limiting column; 122. a turntable; 123. a second motor; 124. a first support frame; 125. a driving gear; 126. a limiting groove; 127. A connecting plate; 601. a first exhaust fan; 602. a first air heater; 603. a first temperature and humidity detector; 604. a first electric heating tube; 605. a first sandwich panel; 606. a first hot air mouthpiece; 607. semi-finished paper; 608. a second hot air mouthpiece; 609. a second sandwich panel; 610. a second air heater; 611. A second temperature and humidity detector; 612. a second electric heating tube; 613. a drum; 614. a first suction opening; 615. a front drying box body; 616. a first hot air through pipe; 901. a second exhaust fan; 902. a second hot air through pipe; 903. a third air heater; 904. a third temperature and humidity detector; 905. a third electric heating tube; 906. a third sandwich panel; 907. finished paper; 908. a silicone rubber electric heating plate; 909. a conveyor belt; 910. a roller; 911. a third hot air blowing port; 912. a second suction opening; 913. and then drying the box body.

Detailed Description

The invention is further illustrated by the following examples.

A production device of plastic-free tableware packing paper comprises a mixing beater 1, a paper making machine 4, a front dryer 6, a double-sided coating sizing machine 7 and a rear dryer 9, wherein the mixing beater 1 is of a two-stage beating structure, a group of driving beating devices in a first beating box body 105 of the mixing beater 1 drive two groups of driven beating devices, materials in the first beating box body 105 flow into a second beating box body 118 which is obliquely arranged, the driving beating devices in the second beating box body 118 drive a stirring device below to stir, the materials flow into a material conveying pipe 3 from a second discharge port 112 of the second beating box body 118 and are conveyed to the paper making machine 4 through a material conveying pump 2 to carry out the conventional process of wet paper making, the materials are conveyed to the front dryer 6 through a first conveying belt 5 to be dried after being finished, the front dryer 6 comprises a front drying box body 615 with front and rear openings, hot air drying devices are symmetrically arranged in the front and rear drying box body 615, the semi-finished paper 607 is positioned between upper and lower hot air drying devices and is conveyed by a roller 613, the material passing through a front dryer 6 is conveyed to a double-sided coating and glue applying machine 7 for coating and glue applying process, and is conveyed to a rear dryer 9 by a second conveying belt 8 after completion, the rear dryer 9 comprises a rear drying box 913 with a front opening and a rear opening, a conveying belt 909 is arranged at the lower part in the rear drying box 913, a silicon rubber electric heating plate 908 is attached to the conveying belt 909 to realize heating and drying of the bottom surface of the material while conveying the material, a hot air drying device is arranged at the upper part in the rear drying box 913, and the material passing through the rear drying process is a finished product.

Preferably, as shown in fig. 1, the driving beating device in the first beating box 105 includes a first main shaft 104 vertically arranged, the first main shaft 104 is driven by a first motor 102 on a top cover of the first beating box 105, first beating blades 106 and first stirring blades 108 are arranged on the first main shaft 104 in an interlaced manner, a driving gear 125 is arranged on the first main shaft 104, and the driving gear 125 drives driven beating devices on both sides.

Preferably, as shown in fig. 1, the driven pulping device includes a first driven shaft 109, the upper and lower ends of the first driven shaft 109 are installed in a first bearing 110 so as to be vertically installed in the first pulping box 105, the first driven shaft 109 is also provided with first pulping blades 106 and first stirring blades 108 in a staggered manner, a driven gear 107 is arranged on the first driven shaft 109, and the driven gear 107 is engaged with a driving gear 125, so that the first driven shaft 109 is driven to rotate by the rotation of the first main shaft 104.

Preferably, as shown in fig. 3 and 4, the active pulping device in the second pulping box 118 includes a second main shaft 111, the second main shaft 111 is installed at the upper portion of the second pulping box 118, the upper portion of the second pulping box 118 is a rectangular box structure, the lower portion of the second pulping box 118 is a semicircle, one end of the second main shaft 111 is connected to an output shaft of a second motor 123 outside the second pulping box 118, second pulping blades 113 are arranged on the second main shaft 111 in an array, a rotating disc 122 is arranged on the second main shaft 111, an annular array of the rotating disc 122 is provided with a wave-shaped limiting groove 126, a stirring device is arranged below the second main shaft, the stirring device includes a second driven shaft 115 installed at the lower portion of the second pulping box 118 through a second bearing 114, second stirring blades 117 are arranged on the second driven shaft 115, a plurality of connecting plates 127 are arranged on the second driven shaft 115 in an annular array, the tail end of the connecting plate 127 is provided with a limiting column 121, the limiting column 121 can slide in a limiting groove 126, and the rotary disc 122 rotates to drive the limiting column 121 to pass through the limiting groove 126 in turn to drive the second driven shaft 115 to rotate, so that the bottom stirring is realized.

Preferably, as shown in fig. 5, the hot air drying devices arranged in the front drying box 615 in an up-down symmetrical manner include upper and lower hot air drying devices, the upper hot air drying device includes a first interlayer plate 605 connected to the side wall, the first interlayer plate 605 is arranged at the upper part, and the front and rear sides of the first interlayer plate 605 have gaps with the inner wall to realize circulation of air, a first hot air through pipe 616 is arranged in the interlayer of the first interlayer plate 605, the first hot air through pipe 616 is connected to a first hot air blower 602 arranged at the outside, the other end of the first hot air through pipe 616 is communicated to a first hot air blowing port 606, the first hot air blowing port 606 is a shower nozzle structure arranged in an inclined manner and arranged below the first interlayer plate 605, the air blowing direction of the first hot air blowing port is opposite to the material feeding direction, and a first temperature and humidity detector 603 is arranged in the middle of the first hot air blowing port; the lower hot air drying device comprises a second interlayer plate 609 connected to the lower part, and a second hot air blowing opening 608 and a second temperature and humidity detector 611 on the second interlayer plate 609 are symmetrically arranged with the upper hot air drying device.

Preferably, as shown in fig. 5, a top cover of the front drying box 615 is provided with a first exhaust fan 601, the first exhaust fan 601 is communicated with a first air suction opening 614 arranged at an upper portion of the front drying box 615, and a top plate and a bottom plate of the front drying box 615 are respectively provided with a first electric heating pipe 604 and a second electric heating pipe 612 in an aligned manner.

Preferably, as shown in fig. 6, the hot air drying device at the upper part in the rear drying box 913 includes a third interlayer plate 906 connected to the side wall, the third interlayer plate 906 is disposed at the upper part, and the front and rear sides of the third interlayer plate 906 have gaps with the inner wall to realize circulation of air, a second hot air through pipe 902 is disposed in the interlayer of the third interlayer plate 906, the second hot air through pipe 902 is communicated with a third hot air blower 903 disposed outside, the other end of the third hot air through pipe 903 is communicated with a third hot air blowing opening 911, the third hot air blowing opening 911 is a shower nozzle structure disposed obliquely and is arranged below the third interlayer plate 906, the blowing direction of the third hot air blowing opening is opposite to the incoming material direction, and a third temperature and humidity detector 904 is disposed in the middle of the third hot air blowing opening 911; a second exhaust fan 901 is arranged on the top cover of the rear drying box 913, the second exhaust fan 901 is communicated with a second air suction opening 912 arranged at the upper part in the rear drying box 913, and a third electric heating pipe 905 is arranged on the top plate of the rear drying box 913.

12. In addition, the invention also discloses a production process of the plastic-free tableware packaging paper, which comprises the following steps of mixing and pulping the softwood pulp, the hardwood pulp and the bleached bamboo pulp, adding pulp and auxiliary materials, papermaking wet paper, pre-drying, coating and sizing, and post-drying, wherein the production process comprises the following steps:

A. (1) mixing 30-40% of softwood pulp, 70-50% of hardwood pulp and 0-10% of bamboo pulp by weight;

B. beating degree of mixed pulp: 50-55 DEG SR;

C. the dosage of the auxiliary materials to the oven-dried pulp is as follows: (a) 1.0-1.5% of AKD (alkyl ketene dimer), 0.5-1.0% of wet strength agent, 0.8-1.1% of wet strength agent addition point, 0.05-0.1% of cationic starch, 0.05-0.1% of retention aid and 10-18% of filler;

D. a glue application part: PVA is used for the front side, the boiling concentration is 8-9%, the gluing concentration is 3.8-4.2%, and the bar type number is measured: 21#, the pressure of a metering rod is 80KPa, the sizing flow rate of upper roll is 1050L/min, and the single side is controlled to be 1.0-1.5 g/m2, so that the coating weight is ensured to be 20-30 Kg/ton of paper. And (3) using PVA and a water repellent agent for the reverse side, wherein the boiling concentration is 8-9%, the gluing concentration is 3.8-4.0%, the single side is controlled at 0.5-1.0 g/m2, the coating weight is ensured to be 10-15 Kg/ton of paper, and the type of a metering rod is as follows: 18#, the pressure of a measuring rod is 100KPa, the sizing flow of a lower roller is 850L/min, the tension of a front paper sheet of a sizing part is 200-220N/m 2, and the tension of a rear paper sheet of the sizing part is 180-200N/m 2;

E. other parameters of the paper machine are as follows: the concentration of the upper slurry is as follows: 0.4-0.6%, the wire speed is 400m/min, the opening of a lip plate of a head box is 9.7mm, and the first line pressing pressure is as follows: 880-900 KN/m, two-line pressure: 880 to 900KN/m, crimp tension: 380-410 KN/m;

F. soft calendering conditions: a two-nip pressure, a hot roll temperature of 100-1300C, a linear pressure of 50-100 kN/m

G. Quantifying the plastic-free tableware packaging paper: 38-80 g/m2, 5.0-7.0% of water, white color, food grade, longitudinal breaking length of more than or equal to 6.0Km, water absorption of 22-28 g/m2, tightness of less than or equal to 0.8g/m2, air permeability of less than or equal to 120mL/min, front surface smoothness of 30-50 seconds, back surface smoothness of 60-80 seconds, transverse expansion rate of less than or equal to 3.0%, stable thickness, good paper evenness and good smoothness.

Preferably, PVA (polyvinyl alcohol) is used for front sizing in the step D, and the front heating can directly package and bond.

Preferably, the reverse side in the step D adopts the surface adhesive PVA + the water repellent agent, so that the paper has a good waterproof effect, and the reverse side can be used for printing before tableware packaging.

Two specific examples of 40 grams of plastic free cutlery wrapper and 52 grams of plastic free cutlery wrapper are provided below: