阅读说明：本技术 一种纸浆模塑制品的无转移制造工艺及其制造设备 (Transfer-free manufacturing process and manufacturing equipment of paper pulp molded product ) 是由 郭珍珍 于 2021-01-07 设计创作，主要内容包括：本发明提供了一种纸浆模塑制品的无转移制造工艺及其制造设备,属于机械技术领域。它解决了现有的纸浆模塑制造工艺效率不高的技术问题。本发明工艺包括下列步骤：a、在成型模具的丝网模上形成湿胚；b、仅对上模加热,并将上模与下模合模,通过下模的隔热层将上模的热量保持在隔热层和上模之间；c、保持成型的湿胚位置不变,由上模持续进行单独加热加压湿胚定型,将定型过程中的水份从下模的底部排水排汽。本设备包括注浆装置、上模和下模,上模采用导热固态金属制成且在上模上设有加热器,在下模上设有用于形成型腔的隔热层,隔热层的底部设有排水孔。本发明将现有的成型和定型两个步骤在一个工位完成,提高了效率,并减小了设备体积。(The invention provides a transfer-free manufacturing process and manufacturing equipment of a pulp molding product, belonging to the technical field of machinery. The method solves the technical problem of low efficiency of the existing paper pulp molding manufacturing process. The process comprises the following steps: a. forming a wet blank on a wire mesh die of a forming die; b. only the upper die is heated, the upper die and the lower die are assembled, and the heat of the upper die is kept between the heat insulation layer and the upper die through the heat insulation layer of the lower die; c. keeping the position of the formed wet blank unchanged, continuously heating and pressurizing the wet blank by the upper die for forming, and draining water and steam from the bottom of the lower die during the forming process. The equipment comprises a grouting device, an upper die and a lower die, wherein the upper die is made of heat-conducting solid metal and is provided with a heater, the lower die is provided with a heat insulation layer for forming a cavity, and a drain hole is formed in the bottom of the heat insulation layer. The invention completes the prior two steps of forming and shaping at one station, improves the efficiency and reduces the volume of the equipment.)

1. A transfer-free manufacturing process of a pulp molding product is characterized by comprising the following steps:

a. forming a wet blank (4) with the water content of more than 50% on a filter screen die (24) of a forming die;

b. heating only an upper die (21) of a forming die, closing the upper die (21) and a lower die (22), keeping the heat of the upper die (21) between a heat insulation layer (23) of the lower die (22) and the upper die, and further draining the wet blank (4);

c. keeping the position of the formed wet blank (4) unchanged, continuously and independently heating and pressurizing the upper die (21) until the wet blank (4) is formed to obtain a formed pulp molded product with the water content of below 35%, and draining water and steam from the bottom of the lower die (22) during the forming process.

2. The transfer-free manufacturing process of the pulp molded product according to the claim 1, characterized in that in the step a, the pulp is molded on the screen mold (24) by grouting or slurry dipping to form a wet blank (4) with 75-90% of water content.

3. The transfer-free manufacturing process of the pulp molding product according to claim 2, wherein in the step a, the heat insulation layer (23) is formed into a cavity (232) of the lower mold (22), and the dilute pulp (5) in the cavity (232) is vacuumed and drained from a drainage hole (231) of the heat insulation layer (23) to form the wet blank (4).

4. The transfer-free manufacturing process of the pulp molding product according to claim 3, wherein in the step c, the upper mold (21) is matched with the heat insulation layer (23) in shape, and the formed wet blank is pressurized by the downward movement of the upper mold (21) and the heat insulation layer (23) to discharge water and steam.

5. The transfer-free manufacturing process of pulp molded products according to claim 4, wherein in the step c, the heating water drainage and steam drainage and the pressurizing water drainage and steam drainage are simultaneously carried out, and the vacuumizing water drainage and steam drainage are added when the mold is opened.

6. The transfer-free manufacturing process of pulp molded products according to claim 5, wherein in the step c, the pressure is 0.1-1 MPa, and the temperature of the upper mold (21) is 120-260 ℃.

7. The transfer-free manufacturing equipment for the pulp molding product comprises a grouting device (1) and a forming device (2), and is characterized in that the forming device (2) comprises an upper die (21) and a lower die (22) which can be used for heating and pressurizing, the upper die (21) is made of heat-conducting solid metal, a heater is arranged on the upper die (21), a heat insulation layer (23) used for forming a cavity (232) is arranged on the lower die (22), a drain hole (231) is formed in the bottom of the heat insulation layer (23), and a drain channel (222) identical to the drain hole (231) is formed in the bottom of the lower die (22).

8. The pulp molding product transfer-free manufacturing equipment according to claim 7, wherein the thermal insulation layer (23) is made of polymer material or ceramic material.

9. The transfer-free manufacturing equipment of pulp molded products according to claim 7 is characterized in that the bottom of the lower mold (22) is also provided with a vacuum extractor (3).

Technical Field

The invention belongs to the technical field of machinery, relates to a manufacturing process of a paper pulp molding product, and particularly relates to a transfer-free manufacturing process and manufacturing equipment thereof.

Background

Along with the popularization of take-out, the using amount of disposable lunch boxes is continuously increased, and in order to respond to the environmental call of governments, tableware made of degradable materials such as paper pulp is gradually used in the market to replace plastic tableware.

In the forming process of the conventional paper pulp molding product, an empty filter screen mold is firstly placed in a lower mold of a forming cavity, then thin paper pulp is injected into the lower mold of the forming mold, after preliminary filtration, a wet blank is formed on the filter screen mold, then an upper mold moves downwards to form a closed cavity with the lower mold in a mold closing mode, the wet blank is further dehydrated through a vacuumizing device while the upper mold and the lower mold are heated, the blank with lower water content is formed, the filter screen mold with the blank is transferred out of the forming mold after the mold is opened, the blank is transferred into a heating film of a forming machine through a suction claw for hot-pressing forming, and finally burrs are cut to form a finished product.

In the prior art, a forming machine for a pulp molded product is used for making the pulp molded product into a parison with higher water content, and due to the limitation of the structure of a forming die and the limitation of demoulding after wet parison forming, the water content of the parison in the forming die is difficult to achieve low water content, the parison needs to be transferred to a special forming machine, and the shaping die is used for further hot-pressing and forming, so that the parison further removes water, and the pulp molded product with lower water content is obtained.

The other kind of pulp molded product is produced in pulp soaking mode, and through soaking the forming water mold in the forming device into pulp suspension liquid, vacuumizing the forming water mold, adhering one layer of pulp to the forming net of the forming water mold in the shape of the forming mold core and removing the forming water mold from the pulp suspension liquid when the adhered pulp reaches the preset thickness; continuously vacuumizing and dehydrating the forming water mold, after a certain time, closing the transfer mold and the forming water mold, and transferring the pulp molding product blank attached to the forming net of the forming water mold to the transfer mold; transferring the pulp molding product blank from the transfer mold to a stainless steel filter screen mold of a lower hot-pressing mold, and closing the upper hot-pressing mold; and applying pressure in opposite directions to the hot-pressing upper die and the hot-pressing lower die by using a force application device, heating the hot-pressing upper die and the hot-pressing lower die by using the hot-pressing upper die plate and the hot-pressing lower die plate, and vacuumizing through dehydration air holes of the hot-pressing upper die and the hot-pressing lower die.

The two processes adopt the forming die to form the wet blank, the wet blank has higher water content and is easy to deform, and even is difficult to form independently, so the wet blank in the forming die is transferred into the forming die through the transfer die, and a special forming die is required to carry out hot-pressing forming to prepare the paper pulp molding product. After one mould is processed, the parison is transferred to the next process stage by the transfer device and is processed again in the corresponding mould. However, this process has the problem that each process stage requires transfer of the semi-finished product or finished product, the entire system becomes very large and the relocation requirement from the previous process step to the next step becomes very high.

Disclosure of Invention

The invention aims to provide a transfer-free manufacturing process of a pulp molding product aiming at the problems in the prior art, and the technical problems to be solved by the invention are as follows: how to realize the manufacture of the pulp molding product in a mold.

The purpose of the invention can be realized by the following technical scheme: a transfer-free manufacturing process of a pulp molding product is characterized by comprising the following steps:

a. forming a wet blank with the water content of more than 50% on a filter screen mould of a forming mould;

b. only the upper die of the forming die is heated, the upper die and the lower die are closed, and the heat of the upper die is kept between the upper die and the heat insulation layer through the heat insulation layer of the lower die, so that the wet blank is further drained;

c. keeping the position of the formed wet blank unchanged, continuously and independently heating and pressurizing the upper die until the wet blank is formed, obtaining a formed pulp molded product with the water content of below 35 percent, and draining water and steam from the bottom of the lower die in the forming process.

The manufacturing process adopts a single mould to manufacture the paper pulp product, abandons the wet blank transfer step between the conventional process forming and the hot-pressing forming process, realizes the forming and the forming on one mould, avoids the positioning problem of the paper pulp molding product with the right-angle edge because the transfer step and the repositioning of the wet blank in the forming mould of the forming machine are not needed, and can be suitable for the paper pulp molding products with more shapes. In the step c, the heating time can be prolonged, the drying step can be directly carried out, the three process steps of forming, shaping and drying are integrated in one die, and the process is further integrated and simplified. Naturally, the molded pulp product can be half dried or not dried according to the requirement, and the molded pulp product is taken out and put into a dryer for drying or air drying. Because the sizing paper pulp model product with the water content of less than 35 percent has better deformation resistance and certain firmness, the sizing paper pulp model product cannot be easily deformed, can be used as a finished product, such as an inner liner for a packing box, and has no influence on use although the surface is rough. At least two process steps are completed in a single die, the heat insulation effect of a heat insulation layer of the lower die is utilized, the lower die is kept at normal temperature due to the heat insulation effect of the heat insulation layer in the wet blank forming process, moisture in a cavity cannot be influenced by heat of the lower die, so that the lower die can be kept to normally drain water and exhaust steam, the heat of the upper die cannot be dissipated to other places of the lower die through the heat insulation effect in the hot-pressing forming step, and the heating forming can be realized without heating the lower die.

In the transfer-free manufacturing process of the pulp molded product, in the step a, pulp is molded on the filter screen mold in a grouting or slurry dipping mode to form a wet blank with the water content of 75-90%. The wet embryo in this state is very soft and difficult to hold its shape by its own structure, and is supported and held by a screen mold to form a shape.

In the non-transfer manufacturing process of the pulp molding product, the heat insulation layer is formed into a cavity of the lower die, and in the step a, thin pulp in the cavity is vacuumized and drained from a drainage hole of the heat insulation layer in a vacuumizing mode. The heat insulating layer is directly used as a lower mold cavity, and is directly separated from the heat insulating layer during drainage, so that the mold cavity can keep an enlarged heat insulating effect, and the blockage of a drainage channel can be avoided.

In the non-transfer manufacturing process of the pulp molded product, in the step c, the upper die is matched with the heat insulation layer in shape, and the formed wet blank is pressurized to discharge water and steam by matching the downward movement of the upper die with the heat insulation layer. The heat insulation layer is made of non-metal materials, such as ceramics, high polymer materials and the like, the molecular gaps of the materials are large, and water can be directly extruded out from the molecular gaps by adopting upper die pressurization, so that the drainage efficiency is improved. The matching means that the upper die and the lower die are matched with each other to form a cavity, wherein the cavity can be formed by the outward protrusion of the upper die and the inward recess of the lower die, or the cavity formed by the inward recess of the upper die and the outward protrusion of the lower die.

In the non-transfer manufacturing process of the pulp molding product, in the step c, heating, draining and pressurizing draining are simultaneously carried out, and vacuumizing, draining and draining are additionally carried out when the mold is opened. Meanwhile, the drainage efficiency can be improved, and due to the heat preservation effect of the closed space of the cavity and the heat insulation layer, moisture in the cavity can be changed into water vapor after heating to generate high pressure, so that the water vapor in the cavity can be quickly discharged in the gap. And when the mold is opened, vacuumizing, draining and exhausting steam are added, so that the pressure of a cavity during mold opening can be reduced, and the adsorption force of the pulp molded product is reduced.

In the transfer-free manufacturing process of the pulp molded product, in the step c, the pressure is 0.1-1 Mpa, and the temperature of the upper mold is 120-260 ℃.

The transfer-free manufacturing equipment for the paper pulp molding product comprises a grouting device and a forming device and is characterized in that the forming device comprises an upper die and a lower die which can be used for heating and pressurizing, the upper die is made of heat-conducting solid metal and is provided with a heater, a heat insulation layer used for forming a cavity is arranged on the lower die, a drain hole is formed in the bottom of the heat insulation layer, and a drain channel communicated with the drain hole is formed in the bottom of the lower die.

In the transfer-free manufacturing equipment for the pulp molding product, the bottom of the lower die is also provided with a vacuum pumping device.

Compared with the prior art, the transfer-free manufacturing process of the pulp molding product has the following advantages:

1. the invention combines at least two process steps into one mould, uses the heat insulation effect of the heat insulation layer of the lower mould, not only in the wet blank forming process, because of the heat insulation effect of the heat insulation layer, the lower mould keeps normal temperature, the moisture in the cavity can not be influenced by the heat of the lower mould, thereby the lower mould can normally drain water, but also in the drying and shaping step, the heat insulation effect of the heat insulation layer can not cause the heat of the upper mould to be dissipated to other places of the lower mould, the heating and shaping can also realize the heating and shaping without the heating of the lower mould, and the efficiency is improved.

2. The invention adopts a single station to realize grouting, molding and shaping, can add a drying step as required, does not need a transfer step and a repositioning step, ensures that the positioning of the paper pulp molding product with the right-angle side becomes easy to realize, greatly enriches the shape of the paper pulp molding product, and simplifies and reduces the process difficulty.

3. The volume and the structure of the non-transfer manufacturing equipment are reduced, and the transportation and the installation are simplified.

Drawings

FIG. 1 is a schematic view of the forming mold of the present invention before wet-forming;

FIG. 2 is a schematic view showing a wet preform after molding.

Fig. 3 is a schematic view of the state of the hot press drying.

Fig. 4 is a schematic view of a state after the finished product is taken out.

Fig. 5 is a schematic view of the state of the slurry dipping method.

In the figure, 1, a grouting device; 2. a molding device; 21. an upper die; 211. a convex die surface; 22. a lower die; 221. a base; 222. a drainage channel; 23. a thermal insulation layer; 231. a drain hole; 232. a cavity; 3. a vacuum pumping device; 24. a filter screen mould; 4. wet embryo; 5. a thin pulp.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.

The first embodiment is as follows:

as shown in fig. 1, the transfer-free manufacturing apparatus for pulp molded products comprises a grouting device 1 and a forming device 2, wherein the forming device 2 comprises a forming mold capable of being heated and pressurized, the forming mold comprises an upper mold 21 and a lower mold 22, the upper mold 21 is made of heat-conducting solid metal, a heater is arranged on the upper mold 21, the heat-conducting solid metal can be made of aluminum alloy, iron and other materials, and is convenient for heating and heat conduction, a base of the lower mold 22 is made of aluminum alloy material, a heat insulating layer 23 for forming the cavity 232 is provided on the base 221 of the lower mold 22, the heat insulating layer 23 may be made of a heat insulating material such as ceramics or a polymer material, a filter screen die 24 with the shape matched with the die cavity 232 is arranged on the heat insulation layer 23, the male die surface 211 of the upper die 21 is matched with the shape of the heat insulation layer 23, a drain hole 231 is provided at the bottom of the heat insulating layer 23, a drain passage 222 is also provided at the bottom of the base 221, and a general vacuum-pumping device 3 is connected to the bottom of the base 221. The manufacturing equipment adopts the single-station mould to manufacture the paper pulp product, abandons the transfer step of the paper pulp moulding product among the three processes of conventional process forming, hot-press shaping and drying, realizes the three process steps on one mould, and does not need to carry out the transfer step and reposition.

Therefore, the transfer-free manufacturing process of the pulp molding product comprises the following steps: a. forming a wet blank 4 with the water content of 75-90% on a filter screen die 24 of a forming die; as shown in fig. 1, a thin slurry 5 has been poured into the cavity 232 formed by the insulation layer 23. The thin paper pulp 5 is prepared by fully soaking and disintegrating degradable plant raw materials such as bagasse and the like, adding a proper amount of auxiliary agent to form fiber paper pulp, or adding a certain proportion of auxiliary agent to the pulp board after hydraulic pulverization by a beater, and stirring to form the thin paper pulp 5. The thin pulp 5 is transported to the molding die through a pipeline, and the thin pulp 5 is poured into the cavity 232 of the molding die by the pouring device 1. The water of the thin pulp 5 is pumped out from the bottom of the lower mold 22 by the vacuum pumping device 3 to form a wet embryo 4, in this example, the wet embryo 4 has a water content of 80%, as shown in fig. 2.

b. Only the upper die 21 is heated to keep the temperature of the upper die 21 at 120-260 ℃, as shown in fig. 3, the upper die 21 and the lower die 22 are closed, the upper die 21 moves downwards to be matched with the heat insulation layer 23 for pressurization, drainage and steam exhaust, the heat insulation layer 23 of the lower die 22 isolates the heat of the upper die 21, and the temperature between the heat insulation layer 23 and the upper die, namely the temperature in the cavity 232 is kept. And because of the function of the heat-insulating layer 23, the lower die 22 keeps normal temperature, namely the temperature of the lower die is not influenced by the upper die;

c. keeping the position of the formed wet blank 4 unchanged, draining water and steam from the bottom of the lower die 22 through the vacuum extractor 3, and vacuumizing and draining water from the pores of the heat insulation layer 23 by the thin paper pulp 5 in the cavity 232. And simultaneously, continuously and independently heating and pressurizing the upper die 21 until the wet blank 4 is shaped to obtain a shaped paper pulp molded product with the water content of below 35 percent, wherein the pressure in the cavity 232 is 0.1-1 Mpa, and the temperature of the upper die 21 is 120-260 ℃. The heating drainage and the pressurization drainage are simultaneously carried out, so that the efficiency is improved.

As shown in fig. 4, after the direct shaping without transfer in step c, the heating time can be prolonged, the drying step is performed to form a pulp molded product with a water content of about 10%, and before the mold opening, the vacuum-pumping drainage can be added to pump away the high-pressure water vapor in the cavity 232 in order to ensure that the pulp molded product is taken out of the mold. And after the mold is opened, taking out a finished product of the pulp molding product, and storing without trimming.

Example two:

the second embodiment is substantially the same as the first embodiment, except that in the step a, a slurry immersion manner is adopted, as shown in fig. 5, the lower die 22 is immersed in the dilute paper pulp 5 pool, the dilute paper pulp 5 in the dilute paper pulp 5 pool flows into the cavity 232 formed by the heat insulation layer 23, then the vacuum pumping device 3 performs vacuum pumping, a wet blank 4 with a layer of preset thickness is formed on the screen mold 24, the vacuum pumping device 3 keeps performing continuous vacuum pumping, the liquid level of the dilute paper pulp 5 is lowered, and the lower die 22 is exposed, and the subsequent steps are the same as the first embodiment.

Example three:

the third embodiment is basically the same as the first embodiment, except that in the step b, before the hot press forming, the pre-pressing is performed to pre-shape the wet embryo 4, and then the hot press forming is performed.

The specific embodiments described herein are merely illustrative of the scope of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the scope of the invention or exceeding the scope of the claims appended hereto.