CN215289499U

CN215289499U - Production device for paper-plastic products with energy-saving and rapid drying dehydration functions

Info

Publication number: CN215289499U
Application number: CN202022915734.6U
Authority: CN
Inventors: 黄茂荣
Original assignee: Changzhou Chengxin Environmental Protection Technology Co ltd
Current assignee: Changzhou Chengxin Environmental Protection Technology Co ltd
Priority date: 2020-12-08
Filing date: 2020-12-08
Publication date: 2021-12-24
Anticipated expiration: 2030-12-08

Abstract

The utility model relates to a product's apparatus for producing is moulded to paper of energy-conserving and rapid draing dehydration is moulded, refer in particular to the technology that is applied to in the production of paper moulding product and uses, it mainly has an independence and sets up the cold crowded station of squeezing between inhaling thick liquid shaping station and hot pressing design station, this cold crowded station of squeezing can form the last in compound die clearance for being equipped with one according to product shape and size, the bed die utilizes this compound die clearance will just the embryo article squeeze earlier about 30% -50% moisture of discharge after, send to hot pressing design station again and continuously dewater to the below 3% paper that forms and mould the product, utilize the utility model discloses a product can shorten process time and reduce dry heat energy consumption is moulded to paper that apparatus for producing produced.

Description

Production device for paper-plastic products with energy-saving and rapid drying dehydration functions

Technical Field

The utility model relates to a production device for paper-plastic products, in particular to a production device for paper-plastic products with energy conservation and rapid drying and dehydration functions.

Background

With the deepening and the demand of the concept of environmental protection, the technology of the production process of the degradable and recyclable products is more and more important, and especially, the non-toxic, degradable, recyclable and reproducible characteristics of the paper-plastic products made of the herbaceous plant fibers become more keen in the environmental protection products, and the production process of the paper-plastic products is not foreign: the continuous production processes of pulp suction forming, hot press shaping, trimming and the like, wherein how to reduce the heat energy loss and the time for hot press shaping is a technical field which is long desired to be broken through by technicians in the paper-plastic product manufacturing industry; the general pulp absorbing process is to use the vacuum pulp absorbing technology to form the primary blank of the paper-plastic product, the water content of the primary blank is about 70-80%, then various heating dehydration technologies are used to dry the primary blank, however, in the process of directly reducing the water content of the primary blank to below 3% by using the thermal power, the heat loss is huge, and a large amount of time is consumed to finish the process, and the heat energy and the time consumed in the process are obviously contrary to the environmental protection concept, and the production cost is greatly increased, thereby greatly reducing the profit of the paper-plastic product finished by the production process.

In the prior art, another improved paper-plastic production process comprises: the pulp suction forming, cold pressing dehydration, hot pressing forming and trimming, after the pulp suction forming, a cold pressing mold is utilized to directly match the pulp suction mold on a pulp suction forming station, so that the primary blank in the pulp suction mold is pressed to discharge the pressed moisture, the moisture content of the primary blank is reduced to 50% -60% from 70% -80% to form a wet blank, then the wet blank is moved to a hot pressing forming station to be dehydrated to the moisture content of below 3% to form a semi-finished product, however, in the conventional cold pressing dehydration process, referring to fig. 4 to fig. 6, the pulp suction mold 91 is provided with a ventilation net 93 for pulp suction filtration forming, the ventilation net 93 is a plurality of sheet-shaped ventilation nets 93 formed by combining criss-cross net lines, as shown in fig. 6, the ventilation net 93 is provided with a plurality of meshes 930, and when the pressing mold 92 is pressed, the surface of the semi-dry wet blank M contacting with the pulp suction mold 91 is sunk into the meshes 930 of the ventilation net 93 to generate the mesh bonding phenomenon As shown in fig. 5, in the conventional production process of cold-pressed paper-plastic products, the semi-dry and wet blanks M with large mold withdrawal gradient can be demolded, if the semi-dry and wet blanks M with small withdrawal gradient or close to the vertical plane are demolded, the surface of the semi-dry and wet blanks M is scratched by the air-permeable net 93, and cannot be demolded smoothly or the pulp fibers are broken to cause hole blockage, and the withdrawal gradient of the mold causes a lot of shape or angle limitation in the production of the paper-plastic products.

Moreover, if the primary blank is directly pressed in the pulp suction mold 91 only by using the extrusion mold 92, the mold closing gap after extrusion (i.e. the thickness of the extruded primary blank) is not calculated only by considering the squeezing and dewatering, so that the thickness of the semi-dry and wet blank M is easily too thick or too thin, and the reject ratio of the finished primary blank is high due to improper thickness; the paper-plastic product can generate yellow spots when the thickness of the semi-dry and wet blank M is too thick, the bursting strength, the folding strength and the strength of the paper-plastic product can be too low when the thickness of the semi-dry and wet blank M is too thin, and uneven and obvious lines can be generated on the surface of the finished product, so that the defect that the existing cold pressing dehydration technology is used as a production means of the paper-plastic product is overcome, the production efficiency cannot be improved, and the production cost is increased.

SUMMERY OF THE UTILITY MODEL

The utility model mainly aims at providing a production device of paper-plastic products with energy saving and rapid drying and dehydration, which comprises a cold extrusion pressing station which is formed by combining an upper die and a lower die and can be used for extruding a primary blank product, wherein the cold extrusion pressing station is arranged between a slurry suction forming station and a hot-press shaping station; the thickness of a finished product is taken as a reference, namely the mold closing gap of the hot-pressing shaping station is kept at the distance of the thickness of the finished product, the thickness of a semi-finished product dried by the hot-pressing shaping station is kept at the distance of the thickness of the finished product, the distance of the mold closing gap of the cold-extrusion pressing station is 1-1.3 times of the thickness of the finished product, namely the distance of the mold closing gap of the cold-extrusion pressing station is 1-1.3 times of the thickness of the finished product, the thickness of a semi-dry wet blank extruded by the cold-extrusion pressing station is kept at 1-1.3 times of the thickness of the finished product, the distance of the mold closing gap of the slurry-suction shaping station is 2-2.3 times of the thickness of the finished product, namely the thickness of a blank shaped by the slurry-suction shaping station is kept at 2-2.3 times of the thickness of the finished product.

Preferably, a vacuum chamber is formed at the bottom of the lower mold of the cold extrusion pressing station, a containing space for placing the primary blank is arranged on the other surface of the lower mold, a forming mold surface which has the same shape as the primary blank and is used for positioning and forming the primary blank is arranged in the containing space, a plurality of air holes are arranged between the vacuum chamber and the containing space, and the air holes penetrate through the space between the vacuum chamber and the containing space and are used for vacuum negative pressure extraction of the pulp suction forming station, the cold extrusion pressing station and the hot pressing forming station to extract water.

Preferably, the mold surface of the lower mold with the mold release angle of more than 5 degrees is provided with a breathable net, and the mold surface of the lower mold with the mold release angle of less than 5 degrees is not provided with the breathable net.

Preferably, after the slurry suction forming station enters the slurry tank to suck slurry and form the primary blank, the primary blank is transferred to the accommodating space of the lower die of the cold extrusion pressing station, when the upper and lower dies are closed and extruded, the primary blank is pressed by the extrusion force of the upper die and the adsorption force of vacuum negative pressure to be completely attached to the forming die surface of the lower die and the breathable net, so that the thickness of the primary blank is formed to the thickness extruded by the cold extrusion pressing station from the thickness formed by the slurry suction forming station, the pressed primary blank is extruded with water and discharged out of the surface, the discharged water is adsorbed to the vacuum cavity through the air holes by the vacuum negative pressure and then discharged out of the lower die, and the primary blank is reduced to 55-60% of water content from the original 68-75% of water content, thereby obtaining a semi-dry wet embryo product with lower water content; transferring the semi-dry wet embryo product to the hot-pressing shaping station, and completely vaporizing and evaporating free water on the surface of the semi-dry wet embryo product and bound water inside the semi-dry wet embryo product by utilizing pressurization and heating drying of a heating system, so that the moisture content of the semi-dry wet embryo product is reduced from 55-60% to below 3% to obtain a semi-finished product.

Preferably, the primary blank after the cold extrusion pressing process is transferred to the hot press molding station for heating and drying, and the primary blank without the cold extrusion pressing process is directly transferred to the hot press molding station for heating and drying, wherein the ratio of the drying time used by the two is 1: 2, and the proportion of heat energy consumed is 2: 3.

after the technical scheme is adopted, the utility model discloses use one-tenth product thickness as the benchmark, the distance in the compound die clearance through setting up the cold extrusion and squeezing the station is 1~1.3 times of finished product thickness, utilize the cold extrusion to squeeze dehydration to the moisture content most appropriate moisture content be 50% -60% half-dry wet embryo article B, the compound die clearance that sets up hot pressing design station again keeps in the distance of this finished product thickness, utilize hot pressing drying dehydration with half-dry wet embryo article B dry to the moisture content semi-manufactured goods C below 3%, adopt the utility model discloses the means that makes the technology production flow of whole paper plastic product used is the maximize of each station and uses, and the waste time does not do meaningless consumption with the energy consumption.

Drawings

FIG. 1 is a diagram showing the variation of the moisture content and thickness of the primary blank by using the process flow of the present invention;

FIG. 2 is a schematic view of the mold assembly of the present invention;

FIG. 3 is a schematic view of the lower mold structure of the cold extrusion pressing station of the present invention;

FIG. 4 is a schematic view of a conventional cold pressing die and a pulp sucking die;

FIG. 5 is a schematic view of a conventional cold pressing technique for producing a bonded mesh between a wet blank and a permeable mesh;

fig. 6 is a schematic view of an air-permeable net.

Description of the symbols:

slurry suction forming station

Cold extrusion press station

Upper extrusion die

Lower extrusion die

221.. accommodating space

222.. forming die face

Vacuum chamber

Air vent

Mold clamping gap

Hot press shaping station

Air permeable net

Slurry suction mold

92.. extrusion die

93.. air permeable net

A

Semi-dry wet embryo product

C. semi-finished product

Thickness of finished product

Semi-dry wet embryo.

Detailed Description

Referring to fig. 1 to 3, the present invention provides an apparatus for producing paper-plastic products with energy saving and rapid drying and dewatering functions, which mainly comprises an upper mold 21 and a lower mold 22 combined to form an independent cold extrusion pressing station 2 for extruding a primary blank a, wherein the cold extrusion pressing station 2 is disposed between a slurry suction forming station 1 and a hot press forming station 3, so that the overall process flow is slurry suction forming, cold extrusion pressing, and hot press forming, the upper and lower molds 21, 22 of the cold extrusion pressing station 2 can form a mold closing gap 225 during mold closing, and the extrusion force after the upper and lower molds 21, 22 are closed is utilized to press the primary blank a; taking a finished product thickness X as a reference, namely keeping the mold closing gap of the hot-press shaping station 3 at the distance of the finished product thickness X, setting the distance of the finished product thickness X, keeping the thickness of a semi-finished product C dried by the hot-press shaping station 3 at the distance of the finished product thickness X, keeping the distance of the mold closing gap of the cold-extrusion pressing station 2 at 1-1.3 times of the finished product thickness X, namely keeping the distance of the mold closing gap of the cold-extrusion pressing station 2 at 1-1.3 times of the finished product thickness X, keeping the thickness of a semi-dry wet blank B extruded by the cold-extrusion pressing station 2 at 1-1.3 times of the finished product thickness X, keeping the distance of the mold closing gap of the slurry suction forming station 1 at 2-2.3 times of the finished product thickness X, namely keeping the thickness of a blank A formed by the slurry suction forming station 1 at 2-2.3 times of the finished product thickness X; a vacuum chamber 223 is formed at the bottom of the lower mold 22 of the cold extrusion pressing station 2, a receiving space 221 for placing the primary blank a is formed on the other surface of the lower mold 22, a forming mold surface 222 having the same shape as the primary blank a is provided in the receiving space 221 for positioning and forming the primary blank a, a plurality of air holes 224 are formed between the vacuum chamber 223 and the receiving space 221, and the air holes 224 penetrate through the vacuum chamber 223 and the receiving space 221 for vacuum negative pressure water extraction of the slurry suction forming station 1, the cold extrusion pressing station 2 and the hot press forming station 3; the forming mold surface 222 has different angles according to the shape of the paper-plastic product, a permeable net 4 is disposed on the mold surface with the demolding angle of the lower mold 22 being greater than 5 degrees, the permeable net 4 is not disposed on the mold surface with the demolding angle of the lower mold 22 being less than 5 degrees, but the forming mold surface 222 without the permeable net 4 still has air holes 224 penetrating between the mold surface and the vacuum chamber 223.

As is known to those skilled in the paper and plastic product industry, if the cost of dewatering based on vacuum suction dewatering is 1, the cost ratio of vacuum suction dewatering, cold press dewatering and hot press drying dewatering is 1: 70: 330, namely, under the same dewatering amount, the cost for reducing the cold extrusion pressing dewatering is 70 times of that of the vacuum pulp sucking dewatering, and the cost for reducing the hot pressing drying dewatering is about 5 times of that of the cold extrusion pressing dewatering; the dehydration characteristics of different drying methods are respectively as follows: the vacuum slurry sucking dehydration can only suck the free water on the surface of the primary blank A, so the effect of dehydration is very limited, and about 10 to 15 percent of the free water of the primary blank A can be discharged; the cold squeezing dehydration is to squeeze and thin the thickness of the primary blank A by utilizing squeezing force so as to enable the water in the primary blank A to be squeezed and discharged, the water which can be discharged is about 30 to 50 percent of the water content of the primary blank A according to different proportions of the water discharged by the thickness and the shape of the paper-plastic product, but the cold squeezing dehydration can only discharge free water and can not discharge combined water from the interior of the primary blank A; the hot-pressing drying dehydration is to vaporize free water on the surface of the primary blank A and combined water inside by utilizing heat energy, so that the moisture content of the paper-plastic product can be dried to be less than 3 percent, the time for the hot-pressing drying dehydration has a great difference according to the size, the shape and the thickness of the paper-plastic product, but the lower the moisture content of the primary blank A is, the shorter the hot-pressing drying dehydration time is, and the relative heat energy consumption is also reduced.

The utility model discloses the concrete implementation method does: the cold extrusion pressing station 2 of the present invention is disposed between the slurry suction forming station 1 and the hot press forming station 3, after the slurry suction forming station 1 enters the slurry tank to suck slurry to form the primary blank a, the primary blank a is transferred to the containing space 221 of the lower mold 22 of the cold extrusion pressing station 2, when the upper and lower molds 21, 22 are closed and pressed, the primary blank a is pressed by the extrusion force of the upper mold 21 and the adsorption force of the vacuum negative pressure to completely adhere to the forming mold surface 222 of the lower mold 22 and the air permeable net 4, so that the thickness of the primary blank a is formed from the thickness 2X-2.3X of the slurry suction forming at the initial slurry suction forming station 1 to the thickness 1X-1.3X of the cold extrusion pressing station 2, the pressed primary blank a is squeezed to remove water and is discharged from the surface, and the water is adsorbed to the air vent 224 by the vacuum negative pressure to discharge through the air vent 224 The blank A is taken out of the lower die 22, and the original moisture content is reduced from 68-75% to 50-60%, so that a semi-dry wet blank B with lower moisture content is obtained; transferring the semi-dry wet blank B to the hot-press shaping station 3, and completely vaporizing and evaporating free water on the surface and bound water inside the semi-dry wet blank B by utilizing pressurization and heating drying of a heating system to reduce the water content of the semi-dry wet blank B from 50-60% to below 3% so as to obtain a semi-finished product C; in addition, the pressing force and the vacuum suction force are disclosed in other conventional patent documents, and are not described herein again.

The above implementation was through the following actual test procedures: if the initial blank A with the water content of 72.8 percent does not pass through the cold extrusion pressing station 2 and directly reaches the hot pressing shaping station 3 to be dried to obtain a semi-finished product C with the water content of 1.4 percent, the drying time is 29 seconds; if the same moisture content 72.8% of the primary embryo product is firstly extruded by the cold extrusion pressing station 2 of the utility model for 10 seconds, a semi-dry wet embryo product B with 33.3% of moisture removed can be obtained, and then the pressed semi-dry wet embryo product B is moved to the hot press shaping station 3 for hot press drying for 15 seconds, so that a semi-finished product C with the moisture content of 1.4% can be obtained; from the above experimental data, it is known that the primary blank a with the water content of 72.8% is dried to a semi-finished product with the water content of 1.4% by two different drying and dewatering processes, and the primary blank a without the cold extrusion pressing process needs 29 seconds of drying time; the primary blank A obtained by the cold extrusion pressing process can be finished only by using 15 seconds of drying time, and the ratio of the drying time used by the primary blank A to the drying time used by the secondary blank A is 2: 1; the 33.3% of water removed by the cold extrusion pressing station 2 is the heat energy consumed by the hot pressing setting station 3, which can be saved, namely, the heat energy consumption of 33.3% is saved, and the heat energy consumption ratio of the two is 3: 2; but under factors such as different die design, product molding, size thickness, the proportion of drying time can be different, nevertheless through the utility model discloses the time that the just embryo article A that cold extrusion squeezing station 2 squeezed moisture in advance is dry to semi-manufactured goods C must be shorter, and the heat energy of required consumption is also less.

According to the test results, the difference between the water content of the semi-dry wet embryo product B passing through the cold extrusion pressing station 2 and the water content of the non-pressed primary embryo product A is 33.3 percent of water, the time for drying the semi-dry wet embryo product B to the water content of 1.4 percent is 15 seconds and 29 seconds respectively, the test results of the two are totally different by 14 seconds, namely, the energy consumption and the drying time for pressing the water by increasing the cold extrusion pressing station 2 are saved by 14 seconds; the difference of 20 seconds is that the hot-press shaping mold which is not subjected to the cold extrusion pressing process must be supplemented with the default heating temperature because the moisture contained in the primary blank A is more, so that the lower mold 22 is cooled by the moisture and takes away more heat when being evaporated when the hot-press shaping station 3 is subjected to hot-press drying, and more time is required because the moisture required to be dried and evaporated is more; compared with the semi-dry wet blank B subjected to the cold extrusion pressing process, the semi-dry wet blank B has lower water content and smaller cooling effect on the hot-pressing forming die, so that the hot-pressing forming die has higher temperature compensation and evaporation speed.

To sum up, the utility model discloses a three kinds of technologies play to its dehydration's maximize limit with vacuum pulp suction dehydration, cold extrusion press dehydration, hot pressing drying dehydration, utilize vacuum pulp suction dehydration to let the moisture content of just embryo article A fall to limit 68% -75% in advance promptly, recycle cold extrusion press dehydration to the moisture content is the most appropriate moisture content and is 50% -60% wet embryo article B of partly doing, reuse hot pressing drying dehydration with the dry semi-manufactured goods C below moisture content 3% of half wet embryo article B of doing, the means that whole technology used is the maximize application of this station, and do not waste time and energy consumption and do meaningless consumption.

Claims

1. The utility model provides an apparatus for producing of product is moulded to paper of energy-conserving and rapid draing dehydration which characterized in that: the production device comprises a cold extrusion pressing station for extruding a primary blank by combining an upper die and a lower die, the cold extrusion pressing station is arranged between a slurry suction forming station and a hot pressing forming station, an upper die and a lower die of the cold extrusion pressing station can form a die closing gap when closing the dies, the thickness of a finished product is taken as a reference, namely, the mold closing gap of the hot-pressing shaping station is kept at the distance of the thickness of the finished product, and according to the setting of the distance of the thickness of the finished product, the thickness of the semi-finished product after drying in the hot-pressing shaping station is kept at the distance of the thickness of the finished product, the distance of the die closing gap of the cold-extrusion pressing station is 1-1.3 times of the thickness of the finished product, namely the distance of the die assembly gap of the cold extrusion pressing station is 1 to 1.3 times of the thickness of the finished product, the thickness of the semi-dry wet blank extruded by the cold extrusion pressing station is kept to be 1-1.3 times of the thickness of the finished product.

2. The apparatus for producing paper-plastic products with energy saving and rapid drying and dehydration as claimed in claim 1, wherein: the distance of the mold closing gap of the slurry suction molding station is 2-2.3 times of the thickness of the finished product, namely the thickness of the primary blank molded by the slurry suction molding station is kept at 2-2.3 times of the thickness of the finished product.

3. The apparatus for producing paper-plastic products with energy saving and rapid drying and dewatering functions as claimed in claim 2, wherein: the bottom of the lower die of the cold extrusion pressing station forms a vacuum cavity, the other side of the lower die is provided with a containing space for placing the primary blank, the containing space is internally provided with a forming die surface which is matched with the primary blank in the same shape for positioning and forming the primary blank, a plurality of air holes are arranged between the vacuum cavity and the containing space, and the air holes penetrate through the space between the vacuum cavity and the containing space for the vacuum negative pressure extraction of the pulp suction forming station, the cold extrusion pressing station and the hot pressing forming station to extract water.

4. The apparatus for producing paper-plastic products with energy saving and rapid drying and dehydration as claimed in claim 3, wherein: the mold surface of the lower mold with the demolding angle more than 5 degrees is provided with a breathable net, and the mold surface of the lower mold with the demolding angle less than 5 degrees is not provided with the breathable net.

5. The apparatus for producing paper-plastic products with energy saving and rapid drying and dehydration as claimed in claim 4, wherein: after the former pulp sucking and forming station enters the pulp tank to suck pulp and form the primary blank, the primary blank is transferred to the containing space of the lower die of the cold extruding and pressing station, when the upper and lower dies are closed and extruded, the primary blank is pressed by the extrusion force of the upper die and the adsorption force of vacuum negative pressure to be completely attached to the forming die surface of the lower die and the air permeable net, so that the thickness of the primary blank is formed to the thickness extruded by the cold extruding and pressing station from the thickness of the pulp sucking and forming station, the pressed primary blank is extruded with water and discharged out of the surface, the discharged water is adsorbed to the vacuum cavity by the vacuum negative pressure through the air holes and then discharged out of the lower die, and the primary blank is reduced to 55-60% of water content from the original 68-75% of water content, thereby obtaining a semi-dry wet embryo product with lower water content; transferring the semi-dry wet embryo product to the hot-pressing shaping station, and completely vaporizing and evaporating free water on the surface of the semi-dry wet embryo product and bound water inside the semi-dry wet embryo product by utilizing pressurization and heating drying of a heating system, so that the moisture content of the semi-dry wet embryo product is reduced from 55-60% to below 3% to obtain a semi-finished product.

6. The production device of the paper-plastic product with the advantages of energy saving and rapid drying and dehydration as claimed in claim 1, characterized in that: and (3) transferring the primary blank product subjected to the cold extrusion pressing process to the hot-press shaping station for heating and drying time, and directly transferring the primary blank product not subjected to the cold extrusion pressing process to the hot-press shaping station for heating and drying time, wherein the ratio of the drying time used by the primary blank product to the drying time used by the hot-press shaping station is 1: 2, and the proportion of heat energy consumed is 2: 3.