CN209276901U - A kind of cylinder forming device - Google Patents

Abstract

The utility model discloses a rotary net forming device, which comprises a frame, a surface layer forming part and a bottom layer forming part. The surface layer forming part and the bottom layer forming part are arranged on the frame. Layer couch roll, return roll, first tension roll, surface felt and multiple first guide rolls, the bottom forming part includes bottom cylinder, bottom bottom roll, vacuum suction roll, multiple second guide rolls, the first Two tension rollers and the bottom felt, the surface felt and the bottom felt are in contact with the vacuum suction roll to form a composite area; the surface felt and the bottom felt are independently formed into the surface wet paper sheet and the bottom wet paper sheet, and then use vacuum The vacuum suction action of the suction roller peels off the surface layer of wet paper and composites it on the bottom layer of wet paper to form a composite wet paper. The utility model can make the front and back of the paper have basically the same paper structure, the smoothness of the back of the paper is improved, and is basically equal to the smoothness of the front of the paper, thereby solving the problem of the difference between the two sides of the paper.

Description

A rotary screen forming device

technical field

The utility model relates to the technical field of pulping and papermaking, in particular to a rotary net forming device.

Background technique

In the field of papermaking technology, the rotary screen paper machine has the advantages of simple structure, small footprint, less steel consumption, low investment, easy installation, and easy operation and maintenance. Therefore, it has become the main equipment of small paper mills in my country. Today, when high-speed paper machines are used, rotary screen paper machines still occupy a large proportion of paper machines in my country.

However, due to the limitation of the structural principle, the traditional cylinder paper machine adopts single-side dehydration during the forming process, and at the same time, the front side of the wet paper sheet is in contact with the felt, which has high smoothness, high filler and fine fiber content; Cage contact, its smoothness is low, the content of filler and fine fiber is low, so the difference between the two sides of the paper is very large, including the difference in smoothness on both sides, the difference in chroma on both sides, etc., which greatly limits the use of rotary screen paper machines on some high-grade paper. For the application of paper, especially dyed paper, the color difference between the front and back is very serious.

In order to solve the problem of the two-sided difference of the cylinder paper machine, people have adopted various methods. For example, the rougher wet paper web surface is firstly pressed by the roller to dry on the smooth surface of the cylinder, so that the smoothness of the reverse side of the paper is greatly improved; while the front side with more fine fiber content, Through the pressurization of the upper calender roller on the second cylinder, its smoothness is also improved to a certain extent, so that the difference in smoothness between the two sides of the produced paper is relatively small, but in actual production, the press section behind the forming section Although the remedial measures of the drying section can partially reduce the difference in smoothness between the two sides, it cannot solve the problem of the difference in chroma between the two sides. This is caused by the different raw material structures on the front and back sides. Only by changing the molding section can the above problems be truly solved.

Utility model content

The purpose of this utility model is to overcome the deficiencies of the prior art and provide a rotary screen forming device, which is composited by double layers, so that the front and back of the composite paper are the fronts of each layer before the composite, so that the forming The two sides of the rear paper have basically the same paper structure, which fundamentally solves the problem of the difference between the two sides of the paper produced by the rotary screen forming.

The technical solution of the utility model is: a rotary screen forming device, including a frame, a surface layer forming part and a bottom layer forming part, and the surface layer forming part and the bottom layer forming part are respectively installed on the frame;

The surface layer forming part includes a surface layer cylinder, a surface layer couch roll, a surface layer felt, a return roll, a first tension roll and a plurality of first guide rolls. A loop structure is formed between the tensioning roller and multiple first guide rollers, and the surface layer couch roll is eccentrically crimped on the top of the surface layer cylinder along the advancing direction of the surface layer felt;

The bottom forming part includes the bottom cylinder, the bottom couch roll, the bottom felt, the vacuum suction roll, the second tension roll and a plurality of second guide rolls. The circulation structure is formed between the two guide rollers and the tension roller, and the bottom roller is eccentrically crimped on the top of the bottom cylinder along the advancing direction of the bottom felt;

The top and bottom felts meet at the vacuum suction rolls and form a lamination zone. When the equipment is installed, after the bottom felt of the bottom forming part passes through the bottom cylinder, the vacuum suction roller is gently pressed against the surface between the first guide roller and the return roller behind the surface cylinder of the surface forming part. On the felt, the lamination of the top layer wet paper sheet and the bottom layer wet paper sheet is completed during the operation of the paper machine.

The conveying direction of the facing felt is opposite to the conveying direction of the bottom felt. That is, the surface layer forming part and the bottom layer forming part move towards each other, so that the conveying directions of the surface layer wet paper sheet and the bottom layer wet paper sheet are opposite, which is convenient for compounding.

In the surface layer forming part, the surface layer couch roller, the return roller and the first tension roller are sequentially arranged along the conveying direction of the surface layer felt, and a plurality of first guide rollers are distributed inside the surface layer felt;

In the bottom forming part, the bottom couch roll, the vacuum suction roll and the second tension roll are arranged in sequence along the conveying direction of the bottom felt, and a plurality of second guide rollers are distributed inside the bottom felt.

The surface layer forming part is also provided with a surface layer blanket washing press roller group, along the conveying direction of the surface layer felt, the surface layer felt washing press roller group is located at the back of the surface layer couch roll, and is located at the rear of the surface layer felt washing press roller group. There is a first water spray pipe on one side of the surface blanket; the surface blanket washing squeeze roller group and the first water spray pipe form a surface blanket washing section, after the surface blanket sends out the surface wet paper, the opposite surface blanket After washing, it is re-sent between the surface layer couch roll and the surface layer cylinder;

The bottom layer forming part is also equipped with a bottom felt washing press roller group. Along the conveying direction of the bottom felt, the bottom felt washing press roller group is located behind the bottom couch roll, and a second felt is arranged on one side of the bottom felt behind the bottom bottom felt washing press roller group. Water spray pipe: the bottom felt washing press roller group and the second water spray pipe form the bottom felt washing section, after the bottom felt sends out the bottom wet paper sheet, the bottom felt is washed and sent to the bottom roller and the bottom cylinder between cages.

A vacuum box and a dewatering press roll group are also arranged in the bottom forming part, and the vacuum box and the dewatering press roll set are sequentially arranged in front of the vacuum suction roll along the conveying direction of the bottom felt. The vacuum box and the dewatering press roll set form the dewatering section. After the surface wet paper sheet and the bottom wet paper page are compounded at the vacuum suction roll to form a composite wet paper sheet, they are dehydrated in two stages through the vacuum box and the dewatering press roll set in turn. Then send it out, and enter the drying part of the post-processing program to dry and the coiling part to wind up into paper rolls.

In the bottom forming part, there are one or more bottom cylinders, and one or more bottom couch rolls, and each bottom cylinder is correspondingly matched with one bottom couch roll to output a layer of wet paper. Among them, when there are multiple bottom cylinders and bottom couch rolls, the formed multi-layer wet paper sheet is mainly used to produce high-weight paperboard.

The surface density of the surface layer felt is lower than that of the bottom layer felt, and the basis weight of the surface layer felt is smaller than that of the bottom layer felt. The surface density of the surface layer felt is slightly lower than that of the bottom layer felt, and the weight of the surface layer felt is slightly smaller than that of the bottom layer felt, which is beneficial to the surface layer wet paper sheet from the surface layer felt in the process of compounding with the bottom layer wet paper sheet. peel off.

After the surface layer wet paper sheet on the surface layer felt is combined with the bottom layer wet paper sheet on the bottom layer felt, the moisture range of the formed composite wet paper sheet is 6%-9%; wherein, the moisture content of the surface layer wet paper sheet Do not exceed the moisture content of the underlying wet paper sheet.

After the surface layer wet paper sheet on the surface layer felt is compounded with the bottom layer wet paper sheet on the bottom layer felt, in the composite wet paper sheet formed, the two sides of the composite wet paper sheet are the front surface layer wet paper sheet and the bottom layer wet paper sheet respectively. The front side of the page.

Can realize a kind of rotary screen forming method by above-mentioned device, comprise the following steps:

(1) The top layer couch roller and the surface layer cylinder cooperate to form the surface layer wet paper sheet on the surface layer felt and send it out; the bottom layer couch roll cooperates with the bottom layer cylinder to form the bottom layer wet paper sheet on the bottom layer felt and sent;

(2) After the surface layer wet paper sheet and the bottom layer wet paper sheet are transported to the composite area formed by the vacuum suction roller, the surface layer wet paper sheet is peeled off from the surface layer felt by using the vacuum suction action of the vacuum suction roller , and combined to the underlying wet paper to form a composite wet paper;

(3) Send out the composite wet paper sheet by conveying the bottom felt.

When the above-mentioned rotary net forming device and method are in use, its principle is: the rotary net forming device comprises a matched surface layer forming part and a bottom forming part, wherein the surface layer forming part comprises a rotary cage (i.e., the above-mentioned surface layer rotary net cage), forming one deck of wet paper; the bottom forming part can include one or more cylinders (i.e., the above-mentioned bottom cylinder), forming one or more layers of wet paper; the surface layer forming part and the bottom forming part The felts (ie, the above-mentioned top and bottom felts) run in opposite directions, and the bottom felt is brought into contact with the top felt by vacuum suction rolls.

During the operation of the paper machine, the surface layer wet paper sheet and the bottom layer wet paper sheet are formed independently, and then through the suction action of the vacuum suction roller, the surface layer wet paper sheet is peeled off from the surface layer felt and transferred to the bottom layer wet paper sheet. On the top, the structure of the surface layer + bottom layer (that is, the structure of the above-mentioned composite wet paper sheet) is formed. After the composite wet paper sheet is further dehydrated by the vacuum box and the dewatering press roll group, it enters the subsequent drying section for drying and coiling section. into paper rolls.

The opposite side of the surface layer wet paper sheet (the contact surface with the surface layer cylinder, low smoothness and low fine fiber content) is compounded with the reverse side of the bottom wet paper sheet (the contact surface with the bottom cylinder cage), so the composite In the composite wet paper sheet formed, the front side is the front side of the top layer wet paper sheet (the contact surface with the top layer felt, which has high smoothness and high fine fiber content), and its reverse side is the front side of the bottom wet paper sheet (with the bottom layer felt). The contact surface of the felt), so the composite wet paper has basically the same paper structure on both sides, so as to achieve the purpose of solving the difference between the two sides of the rotary screen forming paper.

Compared with the prior art, the utility model has the following beneficial effects:

The rotary screen forming device adopts the production method of independent molding on both sides and compounding, so that the front and back sides of the prepared paper have basically the same paper structure, and the smoothness of the back side of the paper is improved, which is basically equal to the smoothness of the front side of the paper, so as to completely solve the paper problem. Two-faced problem.

When the rotary screen forming device is used, the surface layer forming part and the bottom layer forming part are independent of each other, so in the production of the bottom layer or the bottom layer and the core layer, both the raw material and the forming dehydration process are independent, and the performance of the paper surface layer is independent. It will be affected by the bottom layer or core layer due to different colors and raw materials.

Description of drawings

FIG. 1 is a schematic structural view of the cylinder forming device in Example 1.

Fig. 2 is a schematic structural view of the cylinder forming device in Example 2.

In the above-mentioned figures, the reference signs are as follows: A is the surface layer forming part, B is the bottom layer forming part, 1 is the surface layer cylinder, 2 is the surface layer couch roll, 3 is the turning roll, 4 is the first Tension roller, 5 is the first guide roller, 6 is the first water spray pipe, 7 is the surface layer felt washing press roller group, 8 is the surface layer felt, 9 is the bottom cylinder, 10 is the bottom roller, 11 is Vacuum suction roller, 12 is the second guide roller, 13 is the vacuum box, 14 is the bottom felt washing press roller group, 15 is the second water spray pipe, 16 is the second tension roller, 17 is the dehydration press roller group, 18 For the bottom blanket.

Detailed ways

The utility model will be further described in detail below in conjunction with the examples, but the implementation of the utility model is not limited thereto.

Example 1

A kind of rotary screen forming device of this embodiment, as shown in Figure 1, comprises frame (not shown in the figure), surface layer forming part A and bottom forming part B, surface layer forming part and bottom forming part are respectively installed on the machine on the shelf.

The surface layer forming part includes a surface layer cylinder 1, a surface layer couch roll 2, a surface layer felt 8, a return roll 3, a first tension roll 4 and a plurality of first guide rolls 5, and the surface layer felt is arranged on the surface layer. A loop structure is formed between the layer couch roll, the return roll, the first tension roll and a plurality of first guide rolls, and the surface layer couch roll is eccentrically crimped on the surface layer cylinder along the advancing direction of the surface layer felt. The surface layer couch roller, the return roller and the first tension roller are arranged in sequence along the conveying direction of the surface layer felt, and a plurality of first guide rollers are distributed inside the surface layer felt. Surface layer forming part is also provided with surface layer felt washing press roller group 7, along the conveying direction of surface layer felt, surface layer felt washing press roller group is positioned at the surface layer couch roll rear, is positioned at the surface layer felt washing press roller group rear surface. One side of the blanket is provided with a first water spray pipe 6; the surface blanket washing squeeze roller group and the first water spray pipe form the surface blanket washing section, after the surface blanket sends out the surface wet paper, the surface blanket After washing, it is re-sent between the surface layer couch roll and the surface layer cylinder.

Bottom forming section comprises a bottom cylinder 9, a bottom couch roll 10, bottom felt 18, vacuum suction roll 11, the second tension roll 16 and a plurality of second guide rolls 12, the bottom felt is arranged on the bottom couch roll, The vacuum suction roll, multiple second guide rolls and tension rolls form a circular structure, and the bottom couch roll is eccentrically pressed on the top of the bottom cylinder along the advancing direction of the bottom felt. The bottom couch roll, the vacuum suction roll and the second tension roll are arranged in sequence along the conveying direction of the bottom felt, and a plurality of second guide rollers are distributed inside the bottom felt. Bottom felt washing press roller group 14 is also arranged in the bottom forming part, along the conveying direction of bottom felt, bottom felt washing press roller group is positioned at the bottom couch roll rear, is positioned at the bottom felt one side of the bottom felt washing press roller group rear rear. Two water spray pipes 15; the bottom felt washing squeeze roller group and the second water spray pipe form the bottom felt washing section, after the bottom felt has sent the bottom wet paper sheet, after the bottom felt is washed, send it to the bottom roller and bottom again between the round mesh cages. Also be provided with vacuum box 13 and dewatering press roll group 17 in the bottom forming part, along the conveying direction of bottom felt, vacuum box and dewatering press roll group are arranged in the front of vacuum suction roll successively. The vacuum box and the dewatering press roll set form the dewatering section. After the surface layer wet paper sheet and the bottom wet paper page are compounded at the vacuum suction roll to form a composite wet paper sheet, the vacuum box and the dewatering press roll set are followed by two-stage dehydration. Then send it out, and enter the drying part of the post-processing program to dry and the coiling part to wind up into paper rolls.

The top and bottom felts meet at the vacuum suction rolls and form a lamination zone. When the equipment is installed, after the bottom felt of the bottom forming part passes through the bottom cylinder, the vacuum suction roller is gently pressed against the surface between the first guide roller and the return roller behind the surface cylinder of the surface layer forming part. On the felt, the lamination of the top layer wet paper sheet and the bottom layer wet paper sheet is completed during the operation of the paper machine.

As indicated by the arrows in Figure 1, the direction of conveyance of the top felt is opposite to the direction of conveyance of the bottom felt. That is, the surface layer forming part and the bottom layer forming part move towards each other, so that the conveying directions of the surface layer wet paper sheet and the bottom layer wet paper sheet are opposite, which is convenient for compounding.

The surface density of the top felt is lower than that of the bottom felt, and the basis weight of the top felt is smaller than that of the bottom felt. The surface density of the surface layer felt is slightly lower than that of the bottom layer felt, and the weight of the surface layer felt is slightly smaller than that of the bottom layer felt, which is beneficial to the surface layer wet paper sheet from the surface layer felt in the process of compounding with the bottom layer wet paper sheet. peel off.

After the surface layer wet paper sheet on the surface layer felt is combined with the bottom layer wet paper sheet on the bottom layer felt, the moisture range of the formed composite wet paper sheet is 6%-9%; wherein, the moisture content of the surface layer wet paper sheet does not exceed The moisture content of the bottom wet paper sheet.

After the surface layer wet paper sheet on the surface layer felt is combined with the bottom layer wet paper sheet on the bottom layer felt, in the composite wet paper sheet formed, the two sides of the composite wet paper sheet are respectively the front side of the surface layer wet paper sheet and the bottom layer wet paper sheet front.

The rotary screen forming method realized by the above-mentioned device comprises the following steps:

(1) The top layer couch roller and the surface layer cylinder cooperate to form the surface layer wet paper sheet on the surface layer felt and send it out; the bottom layer couch roll cooperates with the bottom layer cylinder to form the bottom layer wet paper sheet on the bottom layer felt and sent;

(2) After the surface layer wet paper sheet and the bottom layer wet paper sheet are transported to the composite area formed by the vacuum suction roller, the surface layer wet paper sheet is peeled off from the surface layer felt by using the vacuum suction action of the vacuum suction roller , and combined to the underlying wet paper to form a composite wet paper;

(3) Send out the composite wet paper sheet by conveying the bottom felt.

In this embodiment, the above-mentioned device and method are used to produce 120 g/m ² colored paper, the sizing weight of the forming part of the surface layer is 40 g/m ² , and the sizing weight of the forming part of the bottom layer is 80 g/m ² .

When the above-mentioned rotary net forming device and method are in use, its principle is: the rotary net forming device comprises a matched surface layer forming part and a bottom forming part, wherein the surface layer forming part comprises a rotary cage (i.e., the above-mentioned surface layer rotary net cage), forming one deck of wet paper; the bottom forming part can include one or more cylinders (i.e., the above-mentioned bottom cylinder), forming one or more layers of wet paper; the surface layer forming part and the bottom forming part The felts (ie, the above-mentioned top and bottom felts) run in opposite directions, and the bottom felt is brought into contact with the top felt by vacuum suction rolls.

During the operation of the paper machine, the surface layer wet paper sheet and the bottom layer wet paper sheet are formed independently, and then through the suction action of the vacuum suction roller, the surface layer wet paper sheet is peeled off from the surface layer felt and transferred to the bottom layer wet paper sheet. On the top, the structure of the surface layer + bottom layer (that is, the structure of the above-mentioned composite wet paper sheet) is formed. After the composite wet paper sheet is further dehydrated by the vacuum box and the dewatering press roll group, it enters the subsequent drying section for drying and coiling section. into paper rolls.

The opposite side of the surface layer wet paper sheet (the contact surface with the surface layer cylinder, low smoothness and low fine fiber content) is compounded with the reverse side of the bottom wet paper sheet (the contact surface with the bottom cylinder cage), so the composite In the composite wet paper sheet formed, the front side is the front side of the top layer wet paper sheet (the contact surface with the top layer felt, which has high smoothness and high fine fiber content), and its reverse side is the front side of the bottom wet paper sheet (with the bottom layer felt). The contact surface of the felt), so the composite wet paper has basically the same paper structure on both sides, so as to achieve the purpose of solving the difference between the two sides of the rotary screen forming paper.

Example 2

A kind of rotary screen forming device of this embodiment, as shown in Figure 2, compared with embodiment 1, its difference is that in the bottom forming part, there are two bottom rotary screen cages, and the bottom bottom rolls are also correspondingly two , each bottom cylinder corresponds to a bottom couch roll to output a layer of wet paper, this structure can form two bottom layers of wet paper, after compounding, one of the bottom layers is used as the bottom layer structure, and the other side is used as the core layer structure . In this embodiment, the above-mentioned device can be used to produce 200g/m ² color cardboard, the sizing weight of the forming part of the surface layer is 40g/m ² , and the sizing weight of the core layer and the bottom layer is 80g/m ² .

According to the actual demand of the paper produced, the paper with different layers can be obtained by adjusting the number of the bottom cylinder and the bottom couch roll. The resulting multi-ply wet sheet is mainly used for the production of high basis weight paper.

As mentioned above, the utility model can be better realized, and the above-described embodiment is only a preferred embodiment of the utility model, and is not used to limit the scope of implementation of the utility model; that is, all equal changes made according to the contents of the utility model and modifications are all covered by the scope of protection required by the claims of the present utility model.

Claims (9)

1. a kind of cylinder forming device, which is characterized in that including rack, surface layer forming part and bottom forming part, surface layer forming part It is respectively arranged in rack with bottom forming part；

Surface layer forming part includes that surface layer rotary screen cage, surface layer couch roll, surface layer woollen blanket, later roller, the first idler roller and multiple first are led Roller, surface layer woollen blanket are set between surface layer couch roll, later roller, the first idler roller and multiple first deflector rolls and form loop structure, face Layer couch roll is crimped on the top of surface layer rotary screen cage along the direction of advance bias of surface layer woollen blanket；

Bottom forming part includes bottom rotary screen cage, bottom couch roll, bottom woollen blanket, vacuum suction roller, the second idler roller and multiple Two deflector rolls, bottom woollen blanket are set between bottom couch roll, vacuum suction roller, multiple second deflector rolls and idler roller and form circulation knot Structure, bottom couch roll are crimped on the top of bottom rotary screen cage along the direction of advance bias of bottom woollen blanket；

Surface layer woollen blanket and bottom woollen blanket are in contact at vacuum suction roller and form recombination region.

2. a kind of cylinder forming device according to claim 1, which is characterized in that the conveying direction of the surface layer woollen blanket and bottom The conveying direction of layer woollen blanket is opposite.

3. a kind of cylinder forming device according to claim 1, which is characterized in that in the surface layer forming part, surface layer couch roll, Later roller and the first idler roller are set gradually along the conveying direction of surface layer woollen blanket, and multiple first deflector rolls are distributed in surface layer woollen blanket Side；

In bottom forming part, bottom couch roll, vacuum suction roller and the second idler roller are set gradually along the conveying direction of bottom woollen blanket, Multiple second deflector rolls are distributed on the inside of bottom woollen blanket.

4. a kind of cylinder forming device according to claim 1, which is characterized in that be additionally provided with surface layer in the surface layer forming part Roller group is squeezed in felt washing, and along the conveying direction of surface layer woollen blanket, surface layer felt washing squeezing roller group is located at surface layer couch roll rear, position The first sparge pipe is equipped in the surface layer woollen blanket side at surface layer felt washing squeezing roller group rear；

Bottom felt washing squeezing roller group is additionally provided in bottom forming part, along the conveying direction of bottom woollen blanket, bottom felt washing Squeezing roller group is located at bottom couch roll rear, and the bottom woollen blanket side positioned at bottom felt washing squeezing roller group rear is equipped with the second spray Water pipe.

5. a kind of cylinder forming device according to claim 1, which is characterized in that be additionally provided with vacuum in the bottom forming part Case and dewatering press roller group, along the conveying direction of bottom woollen blanket, vacuum tank and dewatering press roller group are sequentially arranged in vacuum suction roller Front.

6. a kind of cylinder forming device according to claim 1, which is characterized in that in the bottom forming part, bottom cylinder Cage is one or more, and bottom couch roll also mutually should be one or more, each bottom rotary screen cage correspondence and a bottom couch roll phase Cooperation one layer of l Water Paper page of output.

7. a kind of cylinder forming device according to claim 1, which is characterized in that the superficial density of the surface layer woollen blanket is lower than The superficial density of bottom woollen blanket, quantitatively the quantifying less than bottom woollen blanket of surface layer woollen blanket.

8. a kind of cylinder forming device according to claim 1, which is characterized in that the surface layer l Water Paper page on the surface layer woollen blanket With the bottom l Water Paper page on bottom woollen blanket it is compound after, formed compound l Water Paper page moisture range be 6%-9%；Wherein, surface layer The moisture content of l Water Paper page is no more than the moisture content of bottom l Water Paper page.

9. a kind of cylinder forming device according to claim 8, which is characterized in that the surface layer l Water Paper page on the surface layer woollen blanket With the bottom l Water Paper page on bottom woollen blanket it is compound after, formed in compound l Water Paper page, the two sides of compound l Water Paper page is respectively surface layer The front of l Water Paper page and the front of bottom l Water Paper page.