阅读说明：本技术 纸塑产品制造过程中热泵微波一体干燥方法及装置 (Heat pump microwave integrated drying method and device in paper-plastic product manufacturing process ) 是由 黄茂荣 于 2019-10-18 设计创作，主要内容包括：一种纸塑产品制造过程中的干压方法及装置,主要是在纸塑产品制造过程中,将初胚品送入一由热泵烘干区及微波烘干区连接组成的烘干区,该热泵烘干区由一热泵干燥系统提供干燥用热风,该微波烘干区由一微波干燥系统提供震荡加热作用,因此该初胚品接受由热泵干燥系统提供的热风及由微波干燥系统提供的震荡加热作用,可快速降湿至适当低湿,以便后续热压整型为质量优良的纸塑产品的成品。(A dry pressing method and device for paper-plastic products features that the raw paper is fed into a baking region consisting of heat pump baking region and microwave baking region, which are connected together, and said heat pump baking region is used to provide hot air for drying by a heat pump drying system.)

1. A heat pump microwave integrated drying method in a paper-plastic product manufacturing process comprises the following steps:

(1) providing fibrous pulp by a pulp supply system area, supplying the fibrous pulp to an automatic forming machine in a forming production area for pulp absorption to generate an embryo layer, and extruding the embryo layer to form an initial embryo product;

(2) receiving the initial blank by using a profiling jig, and placing the profiling jig and the initial blank on a conveying system;

(3) the conveying system conveys the copying jig carrying the primary blank into a drying zone, the drying zone allows the conveying system to pass through, and the conveying system drives the primary blank to perform drying operation in the drying zone so as to reduce the humidity of the primary blank;

(4) feeding the primary blank product passing through the drying area into a hot-pressing shaping area to make the primary blank product undergo the hot-pressing shaping operation so as to obtain the finished product of the paper-plastic product;

the drying area is divided into a front-stage heat pump drying area and a rear-stage microwave drying area, the heat pump drying area is provided with hot air for drying by a heat pump drying system, the microwave drying area is provided with a vibration heating function by a microwave drying system, the conveying system conveys the prototype fixture to the drying area, the prototype fixture firstly passes through the heat pump drying area, receives the hot air provided by the heat pump drying system to reduce the humidity of the prototype, and then passes through the microwave drying area to receive the vibration heating function provided by the microwave drying system to reduce the humidity of the prototype to low humidity.

2. A heat pump microwave integrated drying device in the paper-plastic product manufacturing process is structurally provided with a pulp supply system area, which supplies fibrous pulp to an automatic forming machine in a forming production area for pulp suction to generate an embryo material layer, and the embryo material layer is extruded to form a primary embryo product; a profiling jig is used for receiving the initial blank product and placing the profiling jig and the initial blank product on a conveying system; the conveying system conveys the copying jig bearing the primary blank into a drying area, so that the primary blank is dried in the drying area to reduce the humidity; the primary blank product passing through the drying zone is sent into a hot-pressing shaping zone, so that the primary blank product is subjected to hot-pressing shaping operation to finish the finished product of the paper-plastic product; it is characterized in that the drying area is formed by connecting a heat pump drying area positioned at the front section with a microwave drying area positioned at the rear section; the heat pump drying area comprises a heat pump drying chamber, a blower, an exhaust pipe, an exhaust fan and a heat pump system, wherein the heat pump drying chamber is arranged on the conveying system in a straddling mode, the blower is arranged on the side face of the heat pump drying chamber, the exhaust pipe is arranged on the top face of the heat pump drying chamber, the exhaust fan is communicated with the exhaust pipe and provides power for pumping air in the heat pump drying chamber to the outside through the exhaust pipe, and the heat pump system can generate dry hot air to be fed into the heat pump drying chamber; the microwave drying area comprises a microwave suppressor, a microwave drying chamber, a blower, an exhaust pipe, a ventilator and a microwave generating system, wherein the microwave drying chamber is arranged on the conveying system in a straddling mode, the microwave suppressor is arranged at the joint of the microwave drying chamber and the heat pump drying chamber, the blower is arranged on the side face of the microwave drying chamber, the exhaust pipe is arranged on the top face of the microwave drying chamber, the ventilator is communicated with the exhaust pipe and provides power for pumping air inside the microwave drying chamber to the outside through the exhaust pipe, and the microwave generating system can provide a vibrating heating effect for the inside of the microwave drying chamber.

[ technical field ] A method for producing a semiconductor device

The invention relates to a heat pump microwave integrated drying method and a device in the manufacturing process of paper-plastic products, in particular to a drying method and a device which can send an initial blank into a drying area formed by connecting a heat pump drying area and a microwave drying area in the manufacturing process of the paper-plastic products and can reduce the humidity of two sections of products integrally.

[ background of the invention ]

At present, a product manufactured by mixing and beating a pulp fiber material and/or a material containing plant fibers into a pulp material, sucking pulp by a pulp sucking mold, attaching the pulp, and performing a hot press molding technique is distinguished from a "plastic product", and is generally called as a "paper-plastic product", or also called as a "molded product" or a "pulp molded product", and is called as a "paper-plastic product" in the present specification. The paper-plastic product has the advantage of easy recovery, remanufacture and reuse, accords with the trend of environmental protection, reuse, energy saving and carbon reduction, is rapidly accepted and is willing to be adopted by the industry and the general public, and the paper-plastic product is often visible, such as: bowl, plate, cup cover, packing material, shock-proof material, cushion material and other products are being used. The manufacturing process and the technological skills of paper and plastic products have been improved and changed frequently in recent years, but the use of fiber material as the starting material is the basic principle.

Regarding the manufacturing process of paper-plastic products, as shown in fig. 1, two operations of "slurry suction molding" and "hot pressing molding" are needed to be roughly distinguished, wherein the "slurry suction molding" is simply that a slurry suction mold descends and immerses into a slurry tank filled with slurry, then a suction device sucks the slurry in the slurry tank through the slurry suction mold in vacuum to form a "blank layer" on the mold surface of the slurry suction mold, when the slurry suction mold sucks the blank layer to ascend away from the slurry tank, the blank layer is gradually dehumidified by continuous suction, then the slurry suction mold together with the blank layer is shifted to press the blank layer with a cold pressing mold to reduce the humidity of the slurry layer and mold the blank layer into a "blank layer", then the blank is sucked by the slurry suction mold or another suction mold to leave the cold pressing mold, thus completing the "slurry suction molding" operation, and then the "hot pressing molding" operation is performed, the method comprises the steps of carrying out hot-pressing shaping operation on the primary blank after pulp sucking and shaping by a hot-pressing die, drying and shaping the primary blank to obtain a finished product of the paper-plastic product. Of course, the finished product of the paper-plastic product produced by the hot-pressing shaping operation must be subjected to operations of trimming (removing flash), checking (checking whether the quality is qualified) and packaging (to facilitate product discharge), and the subsequent operations need not be described in detail.

At present, in the manufacturing process of paper-plastic products, hot pressing and shaping of primary blanks are performed by a hot pressing method, and common operation methods can be classified into a "wet pressing method" and a "dry pressing method", where the wet pressing method is as shown in fig. 2, when the primary blanks have a water content of about 55-70%, hot pressing and shaping are performed directly by a hot pressing and shaping device, the hot pressing temperature is 150 ℃ ± 10 ℃, the primary blanks with high humidity originally are hot pressed and shaped into dry finished products of the paper-plastic products by direct hot pressing, and the hot pressing time must be determined according to the product volume (the larger the product volume is, the longer the hot pressing time must be); the dry pressing method is shown in fig. 3, in which the primary embryo product is first dried (natural drying or hot air drying) in a drying area when the moisture content is about 68-72% (this data is only a little), and then enters a hot pressing apparatus for hot pressing when the moisture content is reduced to 15-18% (this data is only a little), the hot pressing temperature can be as high as 150 ℃ ± 10 ℃, because the hot pressing method is used for hot pressing the primary embryo product with low humidity, the hot pressing time is much shorter than that of the wet pressing method, but the time required for drying (natural drying or hot air drying) is relatively longer.

In the conventional paper-plastic product manufacturing process, when the hot pressing and shaping operation is performed by the dry pressing method, the operation time of the hot pressing and shaping equipment can be greatly reduced, so that the energy consumption is relatively greatly reduced, the equipment failure rate can be reduced, and the manufacturing cost is further reduced, so that the hot pressing and shaping operation by the dry pressing method in the paper-plastic product manufacturing process becomes the mainstream.

The inventor of the present invention has been specialized in research and development and manufacturing work of various paper and plastic products, and through experience of contacting various paper and plastic products with various equipment for a long time, it is recognized that the drying operation (natural drying or hot air drying) in the above conventional dry pressing method has the following disadvantages:

1. when the drying operation of natural drying is adopted, an area with enough occupied area is needed for placing a large number of primary blanks, the natural drying time is needed to be enough, but the appearance and the quality of the dried primary blanks are still poor after the natural drying; generally, the dry pressing method of natural drying has the disadvantages of wide occupied area, time consumption and poor quality, and particularly in rainy days, the drying is difficult due to the increase of the humidity of the natural environment, so that the productivity is sharply reduced, and the production efficiency and the delivery date are seriously affected.

2. The drying operation of hot air drying is generally hot air circulating drying equipment, namely hot air heated circularly in hot air equipment in a drying zone blows over the surface of a primary blank to reduce the humidity of the primary blank, but because the hot air can only blow over the surface of the primary blank and cannot permeate into the interior, the phenomenon of gradual drying can be generated, namely the primary blank is dried firstly from the outer surface and then dried to the interior, the drying degree of the primary blank is difficult to control consistently, and particularly, the phenomenon of difficult uniform drying is more obvious for the primary blank with larger size and complicated shape; in addition, if the surface is dried too fast in the drying process, surface crusting occurs, so that the internal moisture is more difficult to migrate to the surface, which greatly reduces the drying efficiency and causes a large loss of heat energy consumption. Generally speaking, the dry pressing method of hot air drying has the disadvantages of low heating efficiency, large relative heat loss, energy waste, inconsistent drying degree, and further influence on product quality, so that the cost is difficult to reduce.

It is apparent that the above problems need to be improved.

[ summary of the invention ]

The invention aims to provide a heat pump and microwave integrated drying method and device in the paper-plastic product manufacturing process, which has the advantages of high drying speed, capability of greatly shortening the heating time, low energy consumption, high productivity and low product deformation, and can improve the product quality and reduce the manufacturing cost.

In order to achieve the purpose, the invention provides a heat pump and microwave integrated drying method in the manufacturing process of paper-plastic products, which comprises the following steps:

(1) providing fibrous pulp by a pulp supply system area, supplying the fibrous pulp to an automatic forming machine in a forming production area for pulp absorption to generate an embryo layer, and extruding the embryo layer to form an initial embryo product;

(2) receiving the initial blank by using a profiling jig, and placing the profiling jig and the initial blank on a conveying system;

(3) the conveying system conveys the copying jig carrying the primary blank into a drying zone, the drying zone allows the conveying system to pass through, and the conveying system drives the primary blank to perform drying operation in the drying zone so as to reduce the humidity of the primary blank;

(4) feeding the primary blank product passing through the drying area into a hot-pressing shaping area to make the primary blank product undergo the hot-pressing shaping operation so as to obtain the finished product of the paper-plastic product;

the drying area is divided into a front-stage heat pump drying area and a rear-stage microwave drying area, the heat pump drying area is provided with hot air for drying by a heat pump drying system, the microwave drying area is provided with a vibration heating function by a microwave drying system, the conveying system conveys the prototype fixture to the drying area, the prototype fixture firstly passes through the heat pump drying area, receives the hot air provided by the heat pump drying system to reduce the humidity of the prototype, and then passes through the microwave drying area to receive the vibration heating function provided by the microwave drying system to reduce the humidity of the prototype to low humidity.

The invention also provides a heat pump and microwave integrated drying device in the manufacturing process of paper-plastic products, which is structurally provided with a pulp supply system area for supplying fibrous pulp to an automatic forming machine in a forming production area for pulp suction to generate a blank layer, and the blank layer is extruded to form a primary blank; a profiling jig is used for receiving the initial blank product and placing the profiling jig and the initial blank product on a conveying system; the conveying system conveys the copying jig bearing the primary blank into a drying area, so that the primary blank is dried in the drying area to reduce the humidity; the primary blank product passing through the drying zone is sent into a hot-pressing shaping zone, so that the primary blank product is subjected to hot-pressing shaping operation to finish the finished product of the paper-plastic product; is characterized in that the drying area is formed by connecting a heat pump drying area positioned at the front section with a microwave drying area positioned at the rear section; the heat pump drying area comprises a heat pump drying chamber, a blower, an exhaust pipe, an exhaust fan and a heat pump system, wherein the heat pump drying chamber is arranged on the conveying system in a straddling mode, the blower is arranged on the side face of the heat pump drying chamber, the exhaust pipe is arranged on the top face of the heat pump drying chamber, the exhaust fan is communicated with the exhaust pipe and provides power for pumping air in the heat pump drying chamber to the outside through the exhaust pipe, and the heat pump system can generate dry hot air to be fed into the heat pump drying chamber; the microwave drying area comprises a microwave suppressor, a microwave drying chamber, a blower, an exhaust pipe, a ventilator and a microwave generating system, wherein the microwave drying chamber is arranged on the conveying system in a straddling mode, the microwave suppressor is arranged at the joint of the microwave drying chamber and the heat pump drying chamber, the blower is arranged on the side face of the microwave drying chamber, the exhaust pipe is arranged on the top face of the microwave drying chamber, the ventilator is communicated with the exhaust pipe and provides power for pumping air inside the microwave drying chamber to the outside through the exhaust pipe, and the microwave generating system can provide a vibrating heating effect for the inside of the microwave drying chamber.

The invention has the advantages and beneficial effects that: according to the heat pump microwave integrated drying method and device in the paper-plastic product manufacturing process, the heat pump drying system is a low-energy-consumption drying system, so that when the primary blank passes through the heat pump drying area, the heat pump drying system bears the energy consumption required for removing most of moisture in the primary blank, and then before the drying efficiency is reduced sharply, the primary blank enters the microwave drying area to receive the vibration heating effect provided by the microwave drying system, so that the microwave is absorbed outside and inside the primary blank at the same time, and the high efficiency is reduced to low humidity.

[ description of the drawings ]

FIG. 1 is a schematic block diagram of a manufacturing process of a paper-plastic product.

FIG. 2 is a block diagram of a hot press forming operation of a conventional wet pressing method.

FIG. 3 is a block diagram of a conventional dry pressing hot pressing operation.

FIG. 4 is a block diagram illustrating a manufacturing process of a paper-plastic product according to an embodiment of the present invention.

FIG. 5 is a schematic diagram of the composition of the drying zone and the cooperation with the conveying system in an embodiment of the present invention.

The numbers in the figures illustrate the following:

the pulp supply system area 10 forms the primary blank 31 of the production area 20

Drying area 40 of profiling jig 32 conveying system 33

Heat pump drying area 41 heat pump drying chamber 411 blower 412

Exhaust duct 413 exhaust fan 414 heat pump system 415

Microwave drying chamber 421 of microwave suppressor 420 of microwave drying zone 42

Blower 422 exhaust pipe 423 exhaust fan 424

Finished product 60 of paper-plastic product in hot pressing and shaping area 50 of microwave generating system 425

Cut edge region 70 inspection region 80 packaging region 90

[ detailed description ] embodiments

The invention is divided into a heat pump microwave integrated drying method in the paper-plastic product manufacturing process and a heat pump microwave integrated drying device in the paper-plastic product manufacturing process, which are sequentially explained as follows:

the invention provides a heat pump microwave integrated drying method in the paper-plastic product manufacturing process, which is a step in the paper-plastic product manufacturing process, so that the heat pump microwave integrated drying method is disclosed by completely describing the paper-plastic product manufacturing process. As shown in fig. 4, a paper-plastic product is manufactured through the following steps:

1. a pulp supply system area 10 (such as a pulp box) supplies fibrous pulp to an automatic forming machine in a forming production area 20 for pulp suction to generate an embryo material layer, and the embryo material layer is extruded to form a primary embryo product 31;

2. using a copying tool 32 to receive the initial blank 31, and placing the copying tool 32 and the initial blank 31 on a conveying system 33, wherein the placing operation can be performed manually or by a robot;

3. the conveying system 33 conveys the blank 31 carried by the copying tool 32 into a drying zone 40, the drying zone 40 is further divided into a front-stage heat pump drying zone 41 and a rear-stage microwave drying zone 42, the heat pump drying zone 41 is mainly provided with hot air for drying by a heat pump drying system, the microwave drying zone 42 is provided with vibration heating function by a microwave drying system, the front-stage heat pump drying zone 41 and the rear-stage microwave drying zone 42 are connected to form the drying zone 40, the conveying system 33 is allowed to pass through the interior of the drying zone, therefore, when the conveying system 40 conveys the blank 31 carried by the copying tool 32 into the drying zone 40, the blank 31 firstly passes through the heat pump drying zone 41, receives the hot air provided by the heat pump drying system to rapidly damp the blank 31, and then immediately passes through the microwave drying zone 42 to receive the microwave vibration heating function provided by the microwave drying system, continuously dehumidifying the primary blank 31, and finally sending out from the drying zone 40 to complete the operation of the drying zone 40, wherein the primary blank 31 is already dehumidified and the humidity is 15-18% (this data is only a few cases);

4. after passing through the drying zone 40, the blank 31 is then fed into a hot-press shaping zone 50, and the hot-press shaping zone 50 mainly performs hot-press shaping operation on the fed blank 31 by a hot-press shaping device, so that the blank 31 is completely dried into a finished product 60 of a paper-plastic product;

5. and finally, conveying the finished product 60 of the paper-plastic product subjected to hot pressing and shaping to a trimming area 70 for removing flash, conveying to an inspection area 80 for quality inspection, and finally conveying to a packaging area 90 for product packaging before product discharge.

Among the above steps of the paper-plastic product manufacturing process, the step of passing through the drying zone 40 formed by connecting the heat pump drying zone 41 at the front stage and the microwave drying zone 42 at the rear stage is the most important step sought by the present invention, and this step is also the drying method protected by the name "heat pump microwave integrated drying method and apparatus in the paper-plastic product manufacturing process".

Next, a heat pump and microwave integrated drying device in the manufacturing process of paper-plastic products provided by the present invention is described, the drying device is actually a drying area 40, and structurally comprises a heat pump drying area 41 located at the front section and a microwave drying area 42 located at the rear section, the composition of the drying area 40 and the cooperation with the conveying system 33 are shown in fig. 5, the heat pump drying area 41 and the microwave drying area 42 jointly span a conveying system 33, and therefore, a conveying member for driving the articles to move in the conveying system 33 can sequentially circulate through the heat pump drying area 41 and the microwave drying area 42; the heat pump drying area 41 includes a heat pump drying chamber 411, a blower 412, an exhaust duct 413, an exhaust fan 414 and a heat pump system 415, wherein the heat pump drying chamber 411 is straddled on a conveying member of the conveying system 33 to enclose a proper compartment, the number of the blowers 412 is plural, the blowers are disposed on a side surface of the heat pump drying chamber 411 for sending outside air into the heat pump drying chamber 411 when necessary (for example, cooling is required), the exhaust duct 413 is disposed on a top surface of the heat pump drying chamber 411 to provide a duct through which the air inside the heat pump drying chamber 411 can be circulated to the outside, the exhaust fan 414 is communicated with the exhaust duct 413 to provide power for pumping the air inside the heat pump drying chamber 411 to the outside through the exhaust duct 413, and the heat pump system 415 can mainly generate a dry heat source to send the air into the heat pump drying chamber 411.

As shown in fig. 5, the microwave drying section 42 includes a microwave suppressor 420, a microwave drying chamber 421, a blower 422, an exhaust pipe 423, an exhaust fan 424 and a microwave generating system 425, wherein the microwave drying chamber 421 also spans over the conveying member of the conveying system 33 to enclose a proper separation space, the front end of the microwave drying chamber 421 is directly connected to the rear end of the heat pump drying chamber 411, the microwave suppressor 420 is disposed at the connection to prevent the microwave at the connection from overflowing, the number of the blower 422 is plural, the blower 422 is disposed on the side of the microwave drying chamber 421 to send the outside air into the microwave drying chamber 421 when necessary (for example, cooling is required), the exhaust pipe 423 is disposed on the top of the microwave drying chamber 421 to provide a pipeline through which the air in the microwave drying chamber 421 can flow to the outside, the exhaust fan 424 is communicated with the exhaust pipe 423, the microwave generating system 425 is mainly used for providing a vibration heating effect to heat the interior of the microwave drying chamber 421 by microwave, so as to provide a power for pumping the air in the microwave drying chamber 421 to the outside through the exhaust duct 423.

According to the above structure, when the conveying system 33 conveys the copying jig 32 into the drying zone 40, the copying jig firstly enters the heat pump drying zone 41 and sequentially passes through, in the process, a large amount of drying hot air generated by the heat pump system 415 and sent into the heat pump drying chamber 411 dries the blank 31, the moisture content of the blank 31 generally reaches 68-72% when entering the heat pump drying zone 41, and after drying by the large amount of drying hot air generated by the heat pump system 415, the moisture (water) on the surface of the blank 31 can be quickly removed, so that the blank 31 can be quickly dehumidified. When the heat pump drying area 41 is used for drying, the exhaust fan 414 must be turned on to exhaust the air with moisture (moisture) absorbed in the heat pump drying chamber 411 to the outside through the exhaust duct 413, mainly to exhaust the air back to the heat pump system 415, and to re-become dry hot air after moisture removal and temperature rise, and to transport the hot air back to the heat pump drying chamber 411 for drying, so as to achieve the effect of thermal cycle type rapid humidity reduction, so that the moisture content of the preform 31 is rapidly reduced from 68-72% to medium-low humidity. The present invention utilizes the heat pump system 415 to generate a large amount of hot drying air to rapidly dry the primary blank 31, which is mainly to utilize the high efficiency ratio of the heat pump to produce heat energy, so as to consume the least energy in the process of drying a large amount of moisture, thereby achieving the substantial effect of greatly saving energy consumption.

After the drying operation in the heat pump drying area 41, the conveying system 33 drives the profiling jig 32 to support the initial blank 31 to leave the range of the heat pump drying chamber 411, but then enters the range of the microwave drying chamber 421 through the microwave suppressor 420 and sequentially passes through the range, in the process, the microwave generating system 425 generates continuous microwaves to deeply dry the initial blank 31, the microwaves have a high-frequency oscillation effect, so that the microwaves can go deep into the initial blank 31 to heat, the initial blank 31 which is lowered to have low humidity is rapidly dehumidified to a low humidity state of 15-18%, and finally the conveying system 33 drives the profiling jig 32 to support the initial blank 31 to leave the range of the microwave drying chamber 421.

In the drying zone 40 of the paper-plastic product manufacturing process, the invention is formed by connecting the heat pump drying zone 41 at the front section and the microwave drying zone 42 at the rear section, mainly because the primary blank 31 belongs to medium and high humidity in the front section, a large amount of drying hot air is needed to take away high humidity moisture on the surface of the primary blank 31 in the stage so as to achieve the effect of quick drying, a large amount of drying hot air can be provided, the energy consumption is reduced, and the heating energy efficiency of the heat pump system 415 is optimal so as to be far superior to various heating modes. The heat pump system 415 can generate a large amount of dry hot air with high efficiency, and is provided for the front section of the drying area 40 in the paper-plastic product manufacturing process of the present invention to rapidly dehumidify the primary blank 31, and the heat pump system 415 can generate refrigeration along with the other end while heating, so that the heat pump system 415 can simultaneously utilize the heating efficiency and the refrigeration efficiency when cold air is needed to adjust the working environment temperature in the current workshops, thereby achieving two purposes.

After the moisture on the surface of the primary blank 31 is taken away by a large amount of hot drying air through the heat pump drying area 41 to achieve a low or medium humidity, the primary blank 31 enters the microwave drying area 42 to receive microwave action, because the moisture of the primary blank 31 is located in the deep layer inside at this stage, the microwave can be used for high-frequency oscillation action to heat the primary blank 31 deeply, so that the moisture moves to the surface layer and is evaporated finally, the primary blank 31 can be rapidly dehumidified to 15-18% of the low humidity state, and more importantly, when the primary blank 31 is heated and dried by the high-frequency oscillation action of the microwave, the primary blank 31 can maintain a uniform fiber structure inside and outside, the phenomena of collapse, deformation or distortion cannot occur, and the product uniformity can be maintained.

As can be seen from the above description, the drying method of the present invention, which is developed to perform two-stage drying operation of heat pump drying and microwave drying, has better and better effects than the conventional drying method, which performs natural drying or hot air drying.