CN112757666A - Packaging plate production equipment and preparation process - Google Patents
Packaging plate production equipment and preparation process Download PDFInfo
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- CN112757666A CN112757666A CN201911064142.3A CN201911064142A CN112757666A CN 112757666 A CN112757666 A CN 112757666A CN 201911064142 A CN201911064142 A CN 201911064142A CN 112757666 A CN112757666 A CN 112757666A
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Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D7/00—Producing flat articles, e.g. films or sheets
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The invention provides a packaging plate production device which comprises a closed powder bin, a weighing and conveying mechanism, a spiral conveying pipeline, a continuous internal mixer and extrusion molding terminal equipment, wherein the closed powder bin is provided with a weighing and conveying mechanism; the closed powder bin is used for throwing functional powder; the weighing and conveying mechanism comprises a weightlessness scale and a weightlessness scale discharging and conveying pipeline, wherein a feeding hole is formed in the weightlessness scale, the discharging end of the weightlessness scale is connected to the weightlessness scale discharging and conveying pipeline, and the feeding hole is connected with the output end of the closed powder bin; the spiral conveying pipeline is connected with a weightless scale discharging conveying pipeline; the continuous internal mixer uniformly stirs and mixes the functional powder at high temperature, and the mixture in a molten state is pushed out to extrusion molding terminal equipment through an extrusion device; extrusion molding terminal equipment is connected with continuous banbury mixer output powder port, and extrusion molding terminal equipment passes through the extrusion molding mould and forms packing plate through the extrusion molding technology. The invention also provides a preparation process of the packaging plate. The method has the advantages of greatly saving manpower and material resources, low energy consumption and high efficiency in preparing the packaging board.
Description
Technical Field
The invention relates to the technical field of plate production and preparation, in particular to packaging plate production equipment and a packaging plate preparation process.
Background
Based on the existing hollow plate extrusion equipment in the current market and the coextrusion equipment of various sheets with crusted foaming, the functional master batches are firstly manufactured from a granulation system according to certain technical requirements at present, at this stage, a high-speed mixer is generally used for high-speed mixing in the market at present, the temperature is increased in the high-speed mixing process to ensure that the materials are stirred at high temperature, the materials are uniformly stirred and then enter screws (including double screws, triple screws and other devices) for mixing and extruding, at this stage, a kneading machine (also called internal mixer) is used for high-temperature mixing to mix all the materials into a molten state, and then the materials are extruded by a screw and granulated by a water ring, or air-cooled and granulated to finally form the functional master batch, the carrier is usually less, the powder is more and more viscous at the stage, therefore, the auxiliary agent is relatively complex, the labor cost and the production energy consumption are relatively high, and the granulation cost is relatively high.
In addition, the manufactured functional master batch is mixed with the raw materials for the second time, the defoaming agent and master batches with other functions are mixed again, and the mixture is stirred again, namely secondary batching is carried out; then the sheet material is extruded by adding materials into a secondary formula in hollow plate extrusion equipment or skinning foaming co-extrusion equipment and various co-extrusion sheet material equipment, and the sheet material is produced by molding.
In the market, whether hollow plate extrusion equipment or skinning foaming co-extrusion equipment and various co-extrusion sheet equipment are adopted, a feeding system is mostly provided with one channel and integrally formed, at most two channels are fed into an extrusion die, and co-extrusion forming is carried out on two parts, so that most of the end products have no more requirements.
The existing production links are complex, high filling is needed in the production, various powder materials and various additives are mixed and melted into a molten state, and the molten state is plasticized and extruded by a screw to form the functional master batch. In the process, the drier materials are required to be mixed by the screw, the mixing degree is good, the energy consumption is high, the links are more, the equipment abrasion loss is high, the granulating factory is far away from the production factory for extruding the plates, the secondary transportation is caused, the related cost is high, and the waste is high. And moreover, the plate is subjected to secondary proportioning and secondary plasticization with the raw materials after being extruded by a secondary formula, so that great waste is caused in terms of energy consumption, equipment loss and cost control.
Therefore, the equipment capable of preparing the packaging plate by one-step forming of the functional master batch and the corresponding preparation process are urgently needed in the field.
Disclosure of Invention
The invention aims to provide packaging plate production equipment and a preparation process, which are used for solving the technical problems of complex operation, high production cost and the like of the existing preparation process for preparing functional master batches by a two-step method and then extruding the functional master batches into plates by extrusion molding equipment.
In order to achieve the purpose, the invention provides a packaging plate production device which comprises a closed powder bin, a weighing and conveying mechanism, a spiral conveying pipeline, a continuous internal mixer and extrusion molding terminal equipment, wherein the closed powder bin is provided with a weighing and conveying mechanism;
the closed powder bin is used for throwing functional powder;
the weighing and conveying mechanism comprises a weightlessness scale and a weightlessness scale discharging and conveying pipeline, wherein a feeding hole is formed in the weightlessness scale, the discharging end of the weightlessness scale is connected to the weightlessness scale discharging and conveying pipeline, and the feeding hole is connected with the output end of the closed powder bin;
the spiral conveying pipeline is connected with the weightless scale discharging conveying pipeline and is used for spirally pushing functional powder into the continuous internal mixer;
the continuous internal mixer uniformly stirs and mixes the functional powder at high temperature, and the mixture in a molten state is pushed out to extrusion molding terminal equipment through an extrusion device;
the extrusion molding terminal equipment is connected with the powder output port of the continuous internal mixer through a high-temperature isobaric material conveying pipeline, and a fluid pump is arranged at the front end of a die head of the extrusion molding terminal equipment and used for sucking a mixture in a molten state into an extrusion molding die and forming a packaging plate through an extrusion molding process.
Preferably, the closed powder bins are provided with a plurality of functional powder bins for inputting functional powder with different functions and different materials.
Preferably, when the packaging plate is of a multilayer structure, the continuous internal mixer, the weighing and conveying mechanism and the spiral conveying pipeline are correspondingly provided with a plurality of extrusion layers, and the number of the extrusion layers of the packaging plate is the same as that of the continuous internal mixer, the weighing and conveying mechanism and the spiral conveying pipeline.
Preferably, extrusion molding terminal equipment is provided with a plurality ofly, correspondingly, high temperature isobaric delivery pipeline is multichannel pipeline, and this multichannel pipeline designs according to fluid mechanics principle for prepare a plurality of packing boards simultaneously.
Preferably, the extrusion terminal is provided with three, four or six.
Preferably, the functional powder material comprises a carrier raw material, a functional filling material and a functional auxiliary agent, wherein,
the carrier raw materials comprise polypropylene, polyethylene, PET, PTFE, POE, BPET and PVC;
the functional filler comprises organic filling powder and inorganic filling powder;
the functional auxiliary agent comprises an antioxidant, a lubricant, an anti-aging agent, a dispersing agent, a coupling agent, a compatilizer, a plasticizer, an antistatic agent, a heat stabilizer and a foaming agent.
Preferably, the output end of each closed powder bin is provided with the weightlessness scale, and the closed powder bins are used for continuously feeding according to a set proportion.
The invention also provides a preparation process of the packaging plate, which comprises the following steps:
1) feeding the functional powder into a closed powder bin, then feeding the functional powder into a weighing and conveying mechanism, and conveying the functional powder to a weightless scale discharging and conveying pipeline after weighing by a weightless scale in the weighing and conveying mechanism;
2) conveying the functional powder to the spiral conveying pipeline through the weightless scale discharging conveying pipeline, and spirally pushing the functional powder to a continuous internal mixer;
3) the continuous internal mixer is used for uniformly stirring and mixing the functional powder at a high temperature, and the mixture in a molten state is pushed out to extrusion molding terminal equipment through an extrusion device;
4) and the extrusion molding terminal equipment conveys the mixture in the molten state to the die head through a high-temperature isobaric material conveying pipeline, and the mixture in the molten state is sucked into an extrusion molding die through a fluid pump arranged at the front end of the die head of the extrusion molding terminal equipment, so that a packaging plate is formed through an extrusion molding process.
Preferably, in the step 3), a plurality of continuous internal mixers, weighing conveying mechanisms and spiral conveying pipelines are correspondingly arranged, and the number of extrusion layers of the packaging plate is the same as that of the continuous internal mixers, the weighing conveying mechanisms and the spiral conveying pipelines.
Preferably, extrusion molding terminal equipment is provided with a plurality ofly, correspondingly, the continuous internal mixer output is provided with the force pump, high temperature isobaric conveying pipeline is multichannel pipeline, and this multichannel pipeline designs according to fluid mechanics principle for prepare a plurality of packing panels simultaneously.
Compared with the prior art, the production equipment for the packaging plate has the following beneficial effects:
1. the invention adds functional powder into a closed powder bin, uniformly stirs and mixes at high temperature through a continuous internal mixer, then directly pushes the powder out to extrusion molding terminal equipment, does not carry out granulation through a granulator before, then adds the manufactured functional master batch and other functional additives into a screw extruder, and carries out extrusion molding.
2. The packaging plate production equipment can simultaneously prepare multilayer plates, and particularly, a plurality of continuous internal mixers are selected, namely, the output end of the closed powder bin is connected with the plurality of continuous internal mixers, and then the mixture in a molten state is extruded and pushed to extrusion molding terminal equipment through a plurality of high-temperature and isobaric material conveying pipelines, so that the multilayer plates are prepared through a one-step method.
3. The plate-shaped plate production equipment can also prepare a plurality of formed packaging plates at the same time, particularly, a plurality of extrusion molding terminal equipment are connected through a multi-channel high-temperature isobaric material conveying pipeline, and each extrusion molding terminal equipment prepares the required packaging plate, so that the plate preparation efficiency is greatly improved.
Drawings
The drawings used in the present application will be briefly described below, and it should be apparent that they are merely illustrative of the concepts of the present invention.
FIG. 1 is a schematic perspective view of a packaging board manufacturing apparatus according to the present invention;
FIG. 2 is a front view of a packaging board production apparatus of the present invention;
fig. 3 is a top view of a packaging board production apparatus of the present invention.
Summary of reference numerals:
1. closed powder bin 2 and weighing and conveying mechanism
3. Continuous internal mixer 4 and extrusion molding terminal equipment
5. High-temperature isobaric material conveying pipeline
Detailed Description
Hereinafter, an embodiment of a packaging board production apparatus and a manufacturing process of the present invention will be described with reference to the accompanying drawings.
The embodiments described herein are specific embodiments of the present invention, are intended to be illustrative and exemplary in nature, and are not to be construed as limiting the scope of the invention. In addition to the embodiments described herein, those skilled in the art will be able to employ other technical solutions which are obvious based on the disclosure of the claims and the specification of the present application, and these technical solutions include technical solutions which employ any obvious replacement or modification of the embodiments described herein.
The drawings in the present specification are schematic views to assist in explaining the concept of the present invention, and schematically show the shapes of respective portions and their mutual relationships. It should be noted that the drawings are not necessarily drawn to the same scale in order to clearly illustrate the structures of the various elements of the embodiments of the invention. The same reference numerals are used to designate the same or similar parts.
The invention provides a packaging plate production device which comprises a closed powder bin 1, a weighing and conveying mechanism 2, a spiral conveying pipeline, a continuous internal mixer 3 and extrusion molding terminal equipment 4. Wherein, the closed powder bin 1 is used for throwing functional powder; the weighing and conveying mechanism 2 comprises a weightlessness scale and a weightlessness scale discharging and conveying pipeline, wherein a feeding hole is formed in the weightlessness scale, the discharging end of the weightlessness scale is connected to the weightlessness scale discharging and conveying pipeline, and the feeding hole is connected with the output end of the closed powder bin 1; the spiral conveying pipeline is connected with a weightless scale discharging conveying pipeline and is used for spirally pushing functional powder into the continuous internal mixer 3; the continuous internal mixer 3 uniformly stirs and mixes functional powder at high temperature, and pushes the mixture in a molten state into the extrusion molding terminal equipment 4 through an extrusion device; extrusion molding terminal equipment 4 is connected with continuous internal mixer 3 output powder port through high temperature isobaric conveying pipeline 5, and extrusion molding terminal equipment 4's die head front end is provided with the fluid pump for inhale the mixture of molten state to the extrusion molding mould, form packing plate through the extrusion molding technology.
According to the invention, functional powder is added into a closed powder bin 1, is uniformly stirred and mixed at high temperature by a continuous internal mixer 3, and is directly pushed out to an extrusion molding terminal device 4, and is not granulated by a granulator before, and then the manufactured functional master batch and other functional additives are added into a screw extruder and are subjected to extrusion molding.
In order to utilize wastes to the maximum extent, the packaging plate can select various functional powder materials, so that in order to prepare packaging plates with different properties, a plurality of closed powder bins 1 can be arranged, each closed powder bin 1 is used for inputting functional powder materials with different functions and different materials, and the functional powder materials comprise a carrier raw material, a functional filler and a functional auxiliary agent.
The packaging board can be prepared from different combinations and different materials, and the packaging board formed by various materials has strong adsorption capacity to ink, ink and gloss oil, is suitable for printing with various precisions and various high-definition printing devices, and has a pleasant effect which fully meets various printing speeds.
Moreover, the packaging board disclosed by the invention is reasonable in formula and can be freely matched, and the packaging board is prepared by the packaging board production equipment, so that the produced packaging board can fully meet various physical property requirements of inner and outer packages, can meet various climatic conditions in the packaging process, and is much lower in cost compared with the existing packaging board.
In a further embodiment of the invention, the support material comprises polypropylene, polyethylene, PET, PTFE, POE, BPET and PVC. The carrier raw materials can adjust the proportioning weight according to the requirements of the packaging environment temperature of different packaging materials, the weight of the packaging materials and the pressure or tension on the side edge of the packaging box, and the proportioning of the carrier raw materials mainly solves the problem of physical performance of the packaging box.
The carrier material in the present invention may be selected according to the actual requirements of the packaging board, but the carrier material is not limited to the above listed carrier materials, and may be a possible carrier material used in the production process of other packaging boards. The packing plate of the invention is prepared by selecting a plastic carrier and adding stable mineral powder or inorganic filling powder, so that the produced packing plate is completely waterproof, and the waterproof and moistureproof problems of the existing packing plate are thoroughly solved.
In a further embodiment of the invention, the functional filler comprises an organic filler powder and an inorganic filler powder. Further, the organic filling powder material is plant powder material, in other words, the organic filling powder material can also be plant waste material, and specifically comprises superfine wood powder, superfine bamboo powder, superfine peanut shell powder, superfine rice hull powder, superfine soybean shell powder, superfine straw powder, superfine apricot kernel powder, superfine walnut kernel powder, superfine peach kernel powder, superfine sugarcane residue powder, superfine pistachio nut shell powder, superfine red fruit kernel powder, superfine coconut shell powder and the like. Further, the inorganic filling powder comprises diatomite, kaolin, sepiolite powder, calcium carbonate, talcum powder, ultrafine perlite, glass micro-beads, glass floating beads, fly ash, waste alumina and wollastonite.
The functional filler can be selected according to the actual requirements of the packaging board, but the functional filler is not limited to the listed functional filler, and can also be a possible functional filler used in the production process of other packaging boards. The functional filler can be proportioned according to the environmental requirements of the packing materials, and is used for solving the problems of volume weight of the packing materials and the functions of absorbing ink and printing ink gloss oil, thereby ensuring the printing effect, the quick drying speed and the effect of ensuring that the ink color does not fall off.
Further, the functional auxiliary agent comprises an antioxidant, a lubricant, an anti-aging agent, a dispersing agent, a coupling agent, a compatilizer, a plasticizer, an antistatic agent, a heat stabilizer and a foaming agent. The lubricant may include paraffin, zinc stearate, stearic acid, and barium sulfate. The coupling agent may comprise a phthalate ester or an aluminate.
The functional additive filler can be properly adjusted within a proportioning range according to the oil absorption indexes of the filling powder with different functions and the lubricating degree of the filling powder, so that the total fat dissolving, plasticizing and forming effects of the whole material are ensured; in addition, according to the requirements of the packing materials, some electronic components and the packing with certain special requirements need to be antistatic, and then a proper amount of antistatic agent is properly added; some packages have long quality guarantee period, and some packages are exposed outdoors for a long time, so that some ultraviolet-resistant and aging-resistant additives are properly added; some materials need special practice, and foaming agents are added into the required parts of the materials to carry out controllable foaming to meet the properties of the materials. The corresponding functional additives can be selected according to the actual requirements of the packaging board, but the functional additives are not limited to the functional additives listed above, and may be possible functional additives used in the production process of other packaging boards.
The materials selected for the packaging board are nontoxic and harmless plastic raw materials or modified materials among nontoxic materials, the packaging board is nontoxic, harmless and pollution-free, and the selected raw materials are naturally degradable, so that even the materials scattered occasionally in the production process can be degraded after a period of time, the degraded materials are nontoxic and harmless, and the packaging board has excellent rigidity, impact performance and dimensional stability.
In addition, in order to enrich the performance of the packaging plate, a return material or a water gap material can be added into the closed powder bin 1. It should be noted that, in the process of producing and preparing the packaging board, different functional powders can be added into the closed powder bins 1 according to different requirements, but only one functional powder is added into each closed powder bin 1, so that the weight components can be accurately measured according to the requirements through the weight loss scale arranged at the output end of the closed powder bin 1, and the packaging board meeting the requirements is prepared.
The output end of each closed powder bin 1 is provided with a weightlessness scale, and the closed powder bins 1 are used for continuously feeding according to a set proportion, so that the proportioning of each functional powder can be accurately weighed, and a packaging plate can be prepared and produced at any time.
In a further embodiment of the present invention, when the prepared packaging plate has a multilayer structure, a plurality of continuous internal mixers 3, weighing and conveying mechanisms 2 and spiral conveying pipelines are correspondingly arranged, and the number of extrusion layers of the packaging plate is the same as that of the continuous internal mixers 3, the weighing and conveying mechanisms 2 and the spiral conveying pipelines. The arrangement can enable each layer of the packaging plate to correspond to one set of independent system during preparation, so that the characteristics of surface physical property, chemical property and the like can meet the production requirement.
In a further embodiment of the invention, the extrusion terminal 4 of the invention can be provided in plurality in order to be able to produce a plurality of packaging board materials at once, or in order to produce packaging board materials in large quantities at once. Specifically, the number of the extrusion terminals 4 may be three, four or six, and it should be noted that the number of the extrusion terminals 4 is not limited to three, four or six, and may be other numbers, and the number may be set as needed when the packaging board is specifically prepared. Meanwhile, in order to smoothly push the mixed powder in a molten state in the high-temperature isobaric delivery pipeline 5 to the extrusion molding terminal equipment 4, a pressure pump can be arranged at the output end of the continuous internal mixer 3, correspondingly, the high-temperature isobaric delivery pipeline 5 is designed into a multi-channel delivery pipeline, the multi-channel delivery pipeline is designed according to the fluid mechanics principle, and inclines by different angles corresponding to the positions of different extrusion molding terminal equipment 4, for example, the multi-channel delivery pipeline can be designed according to the design modes in figures 1 to 3, and can also be other inclination angles beneficial to the flowing of the mixed powder in the molten state, and the specific design mode is not unique.
As shown in fig. 1, 2 and 3, the closed hopper 1 is provided with five, the continuous internal mixer 3 is provided with three, and the extrusion terminal 4 is provided with seven.
The invention also provides a preparation process of the packaging plate, which comprises the following steps:
1) feeding the functional powder into a closed powder bin 1, then feeding the functional powder into a weighing and conveying mechanism 2, weighing the functional powder by a weightlessness scale in the weighing and conveying mechanism 2, and continuously conveying the functional powder to a weightlessness scale discharging and conveying pipeline according to a set proportion;
2) conveying the functional powder to a spiral conveying pipeline through a weightless scale discharge conveying pipeline, and continuously and uniformly pushing the functional powder to a continuous internal mixer 3 through a spiral;
3) the continuous internal mixer 3 uniformly stirs and mixes functional powder at high temperature, and pushes the mixture in a molten state to the extrusion molding terminal equipment 4 through an extrusion device;
4) the extrusion molding terminal equipment 4 conveys the mixture in the molten state to the die head through the high-temperature isobaric material conveying pipeline 5, and simultaneously the mixture in the molten state is sucked into an extrusion molding die through a fluid pump arranged at the front end of the die head of the extrusion molding terminal equipment 4, so that a packaging plate is formed through an extrusion molding process.
Wherein, the continuous internal mixer 3 in the step 3) is connected with the extrusion molding terminal equipment 4 through the high-temperature equal-pressure material conveying pipeline 5, that is, the mixed powder (porridge-like mixed powder) in a molten state after being mixed at a high temperature by the continuous internal mixer 3 is conveyed into a die head at the front end of the extrusion molding terminal equipment 4 through the high-temperature equal-pressure material conveying pipeline 5.
In a further embodiment of the present invention, in the step 3), a plurality of continuous internal mixers 3, weighing conveying mechanisms 2 and spiral conveying pipelines are correspondingly arranged, and the number of extrusion layers of the packaging plate material is the same as that of the continuous internal mixers 3, the weighing conveying mechanisms 2 and the spiral conveying pipelines. The packaging plate is a multilayer packaging plate, and each layer of the packaging plate corresponds to one independent system during preparation, so that the characteristics of surface physical properties, chemical properties and the like can meet the production requirements.
The above description is directed to embodiments of the packaging board production apparatus and the manufacturing process of the present invention, and the purpose of the embodiments is to explain the spirit of the present invention. Note that those skilled in the art can modify and combine the features of the above-described embodiments without departing from the spirit of the present invention, and therefore, the present invention is not limited to the above-described embodiments. Moreover, the technical features disclosed above are not limited to the combinations with other features disclosed, and other combinations between the technical features can be performed by those skilled in the art according to the purpose of the invention, so as to achieve the purpose of the invention.
Claims (10)
1. The production equipment of the packaging plate is characterized by comprising a closed powder bin, a weighing and conveying mechanism, a spiral conveying pipeline, a continuous internal mixer, a high-temperature isobaric conveying pipeline and extrusion molding terminal equipment;
the closed powder bin is used for throwing functional powder;
the weighing and conveying mechanism comprises a weightlessness scale and a weightlessness scale discharging and conveying pipeline, wherein a feeding hole is formed in the weightlessness scale, the discharging end of the weightlessness scale is connected to the weightlessness scale discharging and conveying pipeline, and the feeding hole is connected with the output end of the closed powder bin;
the spiral conveying pipeline is connected with the weightless scale discharging conveying pipeline and is used for spirally pushing functional powder into the continuous internal mixer;
the continuous internal mixer uniformly stirs and mixes the functional powder at high temperature, and the mixture in a molten state is pushed out to extrusion molding terminal equipment through an extrusion device;
the extrusion molding terminal equipment is connected with the powder output port of the continuous internal mixer through a high-temperature isobaric material conveying pipeline, and a fluid pump is arranged at the front end of a die head of the extrusion molding terminal equipment and used for sucking a mixture in a molten state into an extrusion molding die and forming a packaging plate through an extrusion molding process.
2. The packaging board production equipment as claimed in claim 1, wherein a plurality of the closed powder bins are provided for inputting functional powder with different functions and different materials.
3. The apparatus for producing a packing material as claimed in claim 1, wherein when the packing material has a multi-layer structure, a plurality of said continuous internal mixer, weighing conveyor and screw conveyor are correspondingly arranged, and the number of the extrusion layers of the packing material is the same as the number of the continuous internal mixer, weighing conveyor and screw conveyor.
4. The packaging board production apparatus according to claim 1, wherein a plurality of the extrusion terminal apparatuses are provided, and correspondingly, the high temperature and isobaric delivery ducts are multi-channel delivery ducts designed according to the fluid mechanics principle for simultaneously preparing a plurality of packaging boards.
5. A packaging board production apparatus as claimed in claim 4, wherein there are three, four or six extrusion terminal devices.
6. The packaging board production apparatus as claimed in claim 1, wherein the functional powder comprises a carrier raw material, a functional filler and a functional auxiliary, wherein,
the carrier raw materials comprise polypropylene, polyethylene, PET, PTFE, POE, BPET and PVC;
the functional filler comprises organic filling powder and inorganic filling powder;
the functional auxiliary agent comprises an antioxidant, a lubricant, an anti-aging agent, a dispersing agent, a coupling agent, a compatilizer, a plasticizer, an antistatic agent, a heat stabilizer and a foaming agent.
7. The packaging board production equipment as claimed in claim 2, wherein the weight loss scale is provided at the output end of each closed powder bin, and the closed powder bins are continuously fed according to a set proportion.
8. The preparation process of the packaging plate is characterized by comprising the following steps of:
1) feeding the functional powder into a closed powder bin, then feeding the powder into a weighing and conveying mechanism, and continuously conveying the powder to a weight-loss scale discharging and conveying pipeline according to a set proportion after being weighed by a weight-loss scale in the weighing and conveying mechanism;
2) conveying the functional powder to the spiral conveying pipeline through the weightless scale discharging conveying pipeline, and spirally pushing the functional powder to a continuous internal mixer;
3) the continuous internal mixer is used for uniformly stirring and mixing the functional powder at a high temperature, and the mixture in a molten state is pushed out to extrusion molding terminal equipment through an extrusion device;
4) and the extrusion molding terminal equipment conveys the mixture in the molten state to the die head through a high-temperature isobaric material conveying pipeline, and the mixture in the molten state is sucked into an extrusion molding die through a fluid pump arranged at the front end of the die head of the extrusion molding terminal equipment, so that a packaging plate is formed through an extrusion molding process.
9. The process for preparing a packaging plate according to claim 8, wherein a plurality of continuous internal mixers, weighing and conveying mechanisms and spiral conveying pipelines are correspondingly arranged in step 3), and the number of the extrusion layers of the packaging plate is the same as that of the continuous internal mixers, the weighing and conveying mechanisms and the spiral conveying pipelines.
10. The process for preparing a packaging board as claimed in claim 8, wherein the extrusion molding terminal equipment is provided in plurality, correspondingly, the output end of the continuous internal mixer is provided with a pressure pump, and the high temperature and constant pressure material conveying pipeline is a multi-channel conveying pipeline which is designed according to the fluid mechanics principle and is used for preparing a plurality of packaging boards simultaneously.
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