Spraying type sheet jelly spreading method and atomizing spray gun

Abstract

The invention belongs to the field of starch product production and manufacturing, and particularly relates to a spraying type sheet jelly slurry spreading method and an atomizing spray gun, the method comprises the following steps: S1, preparing stirring equipment, adding 12-18 parts by mass of water into the stirring equipment, and then adding 10-15 parts by mass of starch; s2, continuously stirring for 3-6 minutes, and continuously adding 70-100 parts by mass of water in the process; s3, after stirring is completed, 100-150 parts by mass of water is added for dilution, and cooked paste is prepared; s4, prepared cooked paste and starch are prepared, the cooked paste is spirally atomized and sprayed out through an atomization spray gun, the starch is spirally sprayed out from the side of the output end of the atomization spray gun, and the spiral spraying direction of the atomization spray gun is opposite to the spiral spraying direction of the starch; and S5, mixing the starch with the atomized cooked paste, and then falling the mixture on a conveying belt to finish paste spreading.

Description

Technical Field

[0001] This invention belongs to the field of starch product manufacturing, specifically relating to a spray-type starch sheet spreading method and an atomizing spray gun. Background Technology

[0002] The reason why starchy foods such as rice noodles and vermicelli are popular is because their surface can be coated with sauce, making them delicious. They are often used as a carrier for sauces, while also providing some carbohydrates, and are eaten as snacks. However, if the rice noodles / vermicelli sheets are too thick, they will not absorb the flavor well, affecting the taste. Therefore, reducing the thickness has become one of the research directions.

[0003] The existing process for producing rice noodle sheets includes making starch slurry, spreading the slurry, steaming and shaping it into a sheet. The starch slurry contains about 50% to 60% starch and is in the form of a paste. The existing method of spreading the slurry involves coating the surface of a feeding roller with a layer of starch slurry and transferring it to a conveyor belt. Due to the limitations of the spreading process, it is difficult to further reduce the thickness of the rice noodle sheet. The applicant's subsidiary also proposed CN2024115225571, a method and mechanism for spreading rice noodle slurry based on the principle of a gear pump. This method uses the principle of a gear pump to accurately measure the amount of slurry to be spread, but it only solves the problem of uniformity in spreading the slurry and does not actually reduce the thickness of the rice noodle sheet.

[0004] Therefore, new slurry spreading equipment and methods are needed, which could hopefully further reduce the thickness of the slurry. Summary of the Invention

[0005] To address the problem of difficulty in reducing the thickness of the rice noodle slurry, this invention provides a spray-type rice noodle slurry spreading method and an atomizing spray gun.

[0006] The object of this invention is achieved in the following manner: a spray-type starch sheet spreading method, the method comprising the following steps: S1. Prepare the mixing equipment. Add 12-18 parts by weight of water to the mixing equipment, and then add 10-15 parts by weight of starch. S2. Continue stirring for 3-6 minutes, and add 70-100 parts by weight of water during this process; S3. After stirring, add 100-150 parts by weight of water to dilute and make a paste. S4. Prepare the cooked paste and starch. Spray the cooked paste out in a spiral atomization through an atomizing spray gun. Spray the starch out in a spiral from the side of the output end of the atomizing spray gun. The spiral spraying direction of the atomizing spray gun is opposite to the spiral spraying direction of the starch. S5. The starch and the atomized cooked paste are mixed and then fall onto the conveyor belt to complete the slurry spreading.

[0007] Furthermore, in S4, the mass ratio of the atomized cooked paste to the starch sprayed out in the same time period is 1:1 to 1:1.5.

[0008] Furthermore, in S4, the atomizing spray gun has a double-layer structure, and the starch is sprayed out from the interlayer between the two layers.

[0009] Furthermore, in S1, the water temperature of 12 to 18 parts by mass of water added to the mixing equipment is 40°C to 60°C.

[0010] An atomizing spray gun for the above-mentioned spray-type powder coating method includes a gun body 5. A first atomizing spray structure 6 and a powder spray structure 7 are respectively arranged inside the gun body 5. The rear end of the gun body 5 serves as the material input end, and the front end of the gun body 5 serves as the output end. The first atomizing spray structure 6 is provided with a first spiral atomizing nozzle 61 at the output end of the gun body 5. The powder spray structure 7 is provided with a powder spiral nozzle 71 at the output end of the gun body 5. The spiral directions of the first spiral atomizing nozzle 61 and the powder spiral nozzle 71 are opposite.

[0011] Furthermore, the gun body 5 includes an inner sleeve 52 and an outer protective tube 51 covering the inner sleeve 52. The inner sleeve 52 forms a first slurry conveying channel 62 of the first atomizing spray structure 6, and a first spiral atomizing module 63 is provided at the front end of the first slurry conveying channel 62. The cavity between the inner sleeve 52 and the outer protective tube 51 forms a powder conveying channel 72 of the powder spray structure 7, and a powder spray structure 73 is provided at the front end of the powder conveying channel 72.

[0012] Furthermore, the outer periphery of the first spiral atomizing module 63 abuts against the inner wall of the inner sleeve 52. The first spiral atomizing module 63 includes an atomizing column 631 and at least zero atomizing rings 632 coaxially sleeved on the outer side of the atomizing column 631. The outer walls of the atomizing column 631 and the atomizing rings 632 are provided with a plurality of spiral grooves 64. The cross-sectional area of ​​the spiral grooves 64 gradually decreases from the rear end to the front end of the atomizing column 631 and the atomizing rings 632. The spiral grooves 64 between the atomizing column 631 and the atomizing rings 632, between adjacent atomizing rings 632, and between the atomizing rings 632 and the inner sleeve 52 form a first spiral atomizing nozzle 61.

[0013] Furthermore, a partition ring plate 53 is fixedly connected between the outer protective tube 51 and the inner sleeve 52. The rear side of the partition ring plate 53 is a powder conveying channel 72, and the front end of the partition ring plate 53 is fixedly connected to a powder spraying structure 73. The powder spraying structure 73 consists of several spiral pipes arranged around the circumference of the partition ring plate 53. The spiral pipes are spirally arranged around the inner sleeve 52 and are connected to the powder conveying channel 72.

[0014] Furthermore, the rear ends of the outer protective tube 51 and the inner sleeve 52 are both fixedly connected to flange plates 54, and the rear end of the flange plate 54 forms the inlet of the first slurry conveying channel 62; a guide tube 55 is provided at the rear end of the flange plate 54, one end of the guide tube 55 is fixedly connected to the flange plate 54 and connects to the powder conveying channel 72, and the other end of the guide tube 55 is fixedly connected to the flange plate 54 and forms the inlet of the powder conveying channel 72 on the front end face of the flange plate 54.

[0015] Furthermore, it also includes a second atomizing spray structure 8, which includes a sleeve 81. The sleeve 81 is fitted outside the outer protective tube 51, and a second slurry conveying channel 82 is formed between the sleeve 81 and the outer protective tube 51. A second spiral atomizing module 83 is provided at the front end of the second slurry conveying channel 82. The second spiral atomizing module 83 is an annular block that abuts against the sleeve 81 and the outer protective tube 51 respectively. A plurality of second spiral grooves 84 are provided on the outer wall of the annular block. The cross-sectional area of ​​the second spiral grooves 84 gradually decreases from the rear end to the front end of the annular block.

[0016] Compared to existing technologies, this invention atomizes cooked paste with low starch content and mixes it thoroughly with sprayed powder in opposite spiral directions before spreading it into a paste. This makes the spreading thickness related to the spraying volume and the conveyor belt speed, which further reduces the thickness of the starch paste. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the spray-type rice noodle spreading mechanism; Figure 2 This is a schematic diagram of the front end of the material box of the spray-type starch sheet spreading mechanism cut off; Figure 3 This is a schematic diagram of the spray-type powder coating mechanism cut in half along the axis of the atomizing spray gun. Figure 4 yes Figure 3 Enlarged view of the top of the medium atomizing spray gun; Figure 5 yes Figure 3 Enlarged view of the bottom of the medium atomizing spray gun; Figure 6 This is a schematic diagram of the front end of the atomizing spray gun; Figure 7 It is an exploded view of multiple spiral atomizing modules on the atomizing spray gun; Figure 8 This is a schematic diagram of the structure with the front end of the material box cut off; Figure 9 This is a schematic diagram of the material output from the atomizing spray gun.

[0018] The components include: material bin 1, partition 11, powder feed hole 111, second partition 12, and material bin bottom plate 13. First slurry chamber 2, first slurry supply pipe 21, first slurry pump 22 Powder chamber 3, powder supply pipe 31 Second slurry chamber 4, second feed inlet 41, second slurry supply pipe 42, second slurry pump 43 Gun body 5, outer protective tube 51, inner sleeve 52, partition ring plate 53, flange plate 54, guide tube 55. The components include: a first atomizing jet structure 6, a first spiral atomizing nozzle 61, a first slurry conveying channel 62, a first spiral atomizing module 63, an atomizing column 631, an atomizing ring 632, and a spiral groove 64. 7. Powder injection structure; 71. Powder spiral nozzle; 72. Powder conveying channel; 73. Powder injection structure Second atomizing jet structure 8, sleeve 81, second slurry conveying channel 82, second spiral atomizing module 83, second spiral groove 84. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] In this invention, unless otherwise explicitly specified and limited, the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention.

[0021] As attached Figure 1-3As shown, a spray-type powder coating mechanism includes a material box 1. The material box 1 contains a first slurry chamber 2 for carrying slurry and a powder chamber 3 for carrying powder. The first slurry chamber 2 and the powder chamber 3 are separated by a partition 11. Preferably, the first slurry chamber 2 and the powder chamber 3 form a double-layered chamber structure within the material box 1, with the first slurry chamber 2 located on the top layer and the powder chamber 3 located below it. An atomizing spray gun is fixedly connected inside the material box 1. The atomizing spray gun includes a gun body 5, and the gun body 5 contains a first atomizing spray structure 6 and a powder spray structure 7. The structure of the atomizing spray gun is described here using the terms "front" and "rear." "After" corresponds to "lower" and "upper" in the attached diagram, respectively. The rear end of the gun body 5 serves as the material input end, and the front end of the gun body 5 serves as the output end. The first atomizing spray structure 6 is provided with a first spiral atomizing nozzle 61 at the output end of the gun body 5; the powder spray structure 7 is provided with a powder spiral nozzle 71 at the output end of the gun body 5. The spiral directions of the first spiral atomizing nozzle 61 and the powder spiral nozzle 71 are opposite. The atomizing spray gun is provided with a first slurry conveying channel 62 of the first atomizing spray structure 6 and a powder conveying channel 72 of the powder spray structure 7. The first slurry conveying channel 62 is connected to the first slurry chamber 2; the powder conveying channel 72 is connected to the powder chamber 3.

[0022] Multiple sets of atomizing spray guns are arranged in an array within a material bin 1. The atomizing spray guns in the same row are spaced apart, and the atomizing spray guns in multiple rows are arranged crosswise to increase the uniformity of coverage.

[0023] Furthermore, the gun body 5 includes an inner sleeve 52 and an outer protective tube 51 covering the inner sleeve 52. Both are preferably steel tubes and are coaxially arranged. The inner sleeve 52 forms a first slurry conveying channel 62 of the first atomizing spray structure 6. A first spiral atomizing module 63 is provided at the front end of the first slurry conveying channel 62. The cavity between the inner sleeve 52 and the outer protective tube 51 forms a powder conveying channel 72 of the powder spray structure 7. A powder spray structure 73 is provided at the front end of the powder conveying channel 72.

[0024] Further details are attached. Figure 5-8As shown, the outer periphery of the first spiral atomizing module 63 abuts against the inner wall of the inner sleeve 52. The first spiral atomizing module 63 includes an atomizing column 631, which is a solid column, and at least zero atomizing rings 632 coaxially sleeved around the atomizing column 631. "At least zero" means that the atomizing rings 632 can be omitted, with only one atomizing column 631, allowing the outer periphery of the single atomizing column 631 to abut against the inner wall of the inner sleeve 52. The atomizing rings 632 can also be one or more, with multiple atomizing rings 632 coaxially arranged sequentially. The inner and outer walls are abutting each other in multiple layers. The outer walls of the atomizing column 631 and the atomizing ring 632 are provided with a number of spiral grooves 64. The cross-sectional area of ​​the spiral grooves 64 gradually decreases from the rear end to the front end of the atomizing column 631 and the atomizing ring 632, that is, the cross-sectional area gradually decreases from the feeding direction to the discharging direction. The spiral grooves 64 between the atomizing column 631 and the atomizing ring 632, between adjacent atomizing rings 632, and between the atomizing ring 632 and the inner sleeve 52 form the first spiral atomizing nozzle 61, so that the slurry is atomized by spiral pressurization and spraying.

[0025] Furthermore, a partition ring plate 53 is fixedly connected between the outer protective tube 51 and the inner sleeve 52. The partition ring plate 53 divides the space between the outer protective tube 51 and the inner sleeve 52 into two chambers, front and rear. The chamber on the rear side of the partition ring plate 53 is a powder conveying channel 72. A powder spraying structure 73 is fixedly connected to the front end of the partition ring plate 53. The powder spraying structure 73 consists of several spiral pipes arranged along the circumference of the partition ring plate 53. Both the spiral pipes and the spiral grooves 64 extend forward, but in opposite directions. The spiral pipes are spirally arranged around the inner sleeve 52 and are connected to the powder conveying channel 72.

[0026] Further details are attached. Figure 4 As shown, the outer protective tube 51 and the inner sleeve 52 are both fixedly connected to the rear ends of the flange plate 54. The flange plate 54 is fixedly connected to the top of the partition plate 11. The rear end of the flange plate 54 forms the inlet of the first slurry conveying channel 62 in the first slurry chamber 2. A guide tube 55 is provided at the rear end of the flange plate 54. One end of the guide tube 55 is fixedly connected to the flange plate 54 and communicates with the powder conveying channel 72. The other end of the guide tube 55 is fixedly connected to the flange plate 54 and forms the inlet of the powder conveying channel 72 on the front end face of the flange plate 54. The partition plate 11 is provided with a powder inlet hole 111 that cooperates with the guide tube 55.

[0027] Furthermore, the guide tube 55 is an arc-shaped tube, preferably a 180° elbow round tube as shown in the figure.

[0028] Furthermore, a first slurry supply pipe 21 is fixedly connected to the top of the first slurry chamber 2, and a first slurry pump 22 is connected to the first slurry supply pipe 21; a powder supply pipe 31 is fixedly connected to the side of the powder chamber 3, and the powder supply pipe 31 is used to connect powder supply equipment, including but not limited to filtration and screening equipment and an air compressor that provides positive pressure.

[0029] Furthermore, a second slurry chamber 4 is fixedly connected to the side of the powder chamber 3 away from the first slurry chamber 2, i.e., the second slurry chamber 4 is located below the powder chamber 3. The second slurry chamber 4 and the powder chamber 3 are separated by a second partition 12. The side of the second slurry chamber 4 opposite to the second partition 12 is the bottom plate 13 of the material box. The outer protective tube 51 of the atomizing spray gun passes through the partition 11, the second partition 12, and the bottom plate 13 of the material box in sequence and extends out of the material box 1. A second feed inlet 41 surrounding the outer protective tube 51 is provided on the bottom plate 13 of the material box. It also includes a second atomizing spray structure 8, the second atomizing spray... Structure 8 includes a second feed inlet 41 extending outward toward the material box 1, and a sleeve 81 sleeved outside the outer protective tube 51. A second slurry conveying channel 82 is formed between the sleeve 81 and the outer protective tube 51. A second spiral atomizing module 83 is provided at the front end of the second slurry conveying channel 82. The second spiral atomizing module 83 is an annular block with its outer wall abutting against the sleeve 81 and its inner wall abutting against the outer protective tube 51, similar to the atomizing ring described above. A plurality of second spiral grooves 84 are provided on the outer wall of the annular block. The cross-sectional area of ​​the second spiral grooves 84 gradually decreases from the rear end to the front end of the annular block, similar to the spiral grooves 64 described above.

[0030] Furthermore, a second slurry supply pipe 42 is fixedly connected to the side of the second slurry chamber 4, and a second slurry pump 43 is connected to the second slurry supply pipe 42.

[0031] A spray-type starch coating method using this device includes the following steps: S1. Prepare the mixing equipment. Add 12-18 parts by weight of water to the mixing equipment, and then add 10-15 parts by weight of starch. S2. Continue stirring for 3-6 minutes, and add 70-100 parts by weight of water during this process; S3. After stirring, add 100-150 parts by weight of water and other additives and ingredients to dilute and make a cooked paste. The starch content of the cooked paste is less than 10% to facilitate atomization. S4. Prepare the cooked paste and starch. Atomize the cooked paste using an atomizing spray gun, and atomize the starch using a spiral spray gun, spraying it out from the side of the spray gun's output end. The spiral spray direction of the atomizing spray gun is opposite to the spiral spray direction of the starch, as shown in the attached diagram. Figure 9 As shown; S5. The starch and the atomized cooked paste are mixed and then fall onto the conveyor belt to complete the slurry spreading.

[0032] Furthermore, in S4, the mass ratio of the atomized cooked paste to starch sprayed out in the same time period is 1:1 to 1:1.5, which meets the starch ratio requirements.

[0033] Furthermore, in S4, the atomizing spray gun has a double-layer spray gun structure, that is, as shown below... Figure 5The medium structure allows starch to be sprayed out from the interlayer between the two spray guns, so that the atomized slurry coats the powder inside and out, resulting in more thorough mixing.

[0034] Furthermore, in S1, 12 to 18 parts by weight of water are added to the mixing equipment at a temperature of 40°C to 60°C, which makes the paste smoother and easier to atomize.

[0035] During operation, the first slurry pump 22 and the second slurry pump 43 work simultaneously to pump cooked paste slurry into the first slurry chamber 2 and the second slurry chamber 4 and provide pressure. The powder chamber 3 is connected to the delivered starch material through the powder supply pipe 31. The slurry in the first slurry chamber 2 flows from the first slurry conveying channel 62 to the first spiral atomizing module 63, and is pressurized and atomized through the first spiral atomizing nozzle 61 formed by the spiral groove 64; The slurry in the second slurry chamber 4 flows from the second slurry conveying channel 82 to the second spiral atomizing module 83, and is pressurized and atomized through the vortex atomizing nozzle formed between the second spiral groove 84 and the sleeve 81. Starch enters the powder chamber through the powder supply pipe 31, flows through the powder inlet hole 111, passes through the guide pipe 55, and enters the powder conveying channel 72. It is then spirally sprayed out from the powder spraying structure 73. The powder and the atomized slurry spiral in opposite directions and are fully mixed by the inner and outer layers of atomized slurry. The powder falls onto the continuously conveying steel belt and is then transported to the steaming box for steaming. During the slurry spreading process, the thickness of the starch sheet slurry spreading can be controlled by the spraying volume and the steel belt conveying speed.

[0036] The above description is only a preferred embodiment of the present invention. It should be noted that those skilled in the art can make several changes and improvements without departing from the overall concept of the present invention, and these should also be considered within the scope of protection of the present invention.

Claims

1. A method for spraying rice noodle sheet slurry, characterized in that, The method includes the following steps: S1. Prepare the mixing equipment. Add 12-18 parts by weight of water to the mixing equipment, and then add 10-15 parts by weight of starch. S2. Continue stirring for 3-6 minutes, and add 70-100 parts by weight of water during this process; S3. After stirring, add 100-150 parts by weight of water to dilute and make a paste. S4. Prepare the cooked paste and starch. Spray the cooked paste out in a spiral atomization through an atomizing spray gun. Spray the starch out in a spiral from the side of the output end of the atomizing spray gun. The spiral spraying direction of the atomizing spray gun is opposite to the spiral spraying direction of the starch. S5. The starch and the atomized cooked paste are mixed and then fall onto the conveyor belt to complete the slurry spreading.

2. The spray-type rice noodle sheet spreading method as described in claim 1, characterized in that: In S4, the mass ratio of atomized cooked paste to starch sprayed out in the same time period is 1:1 to 1:1.

5.

3. The spray-type rice noodle spreading method as described in claim 1, characterized in that: In S4, the atomizing spray gun has a double-layer structure, and the starch is sprayed out from the interlayer between the two layers.

4. The spray-type rice noodle spreading method as described in claim 1, characterized in that: In S1, 12 to 18 parts by mass of water are added to the mixing equipment at a temperature of 40°C to 60°C.

5. An atomizing spray gun for implementing the spray-type powder coating method as described in any one of claims 1-4, characterized in that: The gun body (5) includes a first atomizing spray structure (6) and a powder spray structure (7) respectively. The rear end of the gun body (5) serves as the input end of the material, and the front end of the gun body (5) serves as the output end. The first atomizing spray structure (6) has a first spiral atomizing nozzle (61) at the output end of the gun body (5). The powder spray structure (7) has a powder spiral nozzle (71) at the output end of the gun body (5). The spiral directions of the first spiral atomizing nozzle (61) and the powder spiral nozzle (71) are opposite.

6. The atomizing spray gun as described in claim 5, characterized in that: The gun body (5) includes an inner sleeve (52) and an outer protective tube (51) covering the inner sleeve (52). The inner sleeve (52) forms a first slurry conveying channel (62) of a first atomizing spray structure (6). A first spiral atomizing module (63) is provided at the front end of the first slurry conveying channel (62). The cavity between the inner sleeve (52) and the outer protective tube (51) forms a powder conveying channel (72) of a powder spray structure (7). A powder spray structure (73) is provided at the front end of the powder conveying channel (72).

7. The atomizing spray gun as described in claim 6, characterized in that: The outer periphery of the first spiral atomizing module (63) abuts against the inner wall of the inner sleeve (52). The first spiral atomizing module (63) includes an atomizing column (631) and at least zero atomizing rings (632) coaxially sleeved on the outer side of the atomizing column (631). The outer walls of the atomizing column (631) and the atomizing rings (632) are provided with a plurality of spiral grooves (64). The cross-sectional area of ​​the spiral grooves (64) gradually decreases from the rear end to the front end of the atomizing column (631) and the atomizing rings (632). The spiral grooves (64) between the atomizing column (631) and the atomizing rings (632), between adjacent atomizing rings (632), and between the atomizing rings (632) and the inner sleeve (52) form the first spiral atomizing nozzle (61).

8. The atomizing spray gun as described in claim 6, characterized in that: The outer protective tube (51) and the inner sleeve (52) are fixedly connected to a partition ring plate (53). The rear side of the partition ring plate (53) is a powder conveying channel (72). The front end of the partition ring plate (53) is fixedly connected to a powder spraying structure (73). The powder spraying structure (73) consists of several spiral pipes arranged around the circumference of the partition ring plate (53). The spiral pipes are spirally arranged around the inner sleeve (52) and are connected to the powder conveying channel (72).

9. The atomizing spray gun as described in claim 6, characterized in that: The outer protective tube (51) and the inner sleeve (52) are both fixedly connected to the flange plate (54) at their rear ends. The rear end of the flange plate (54) forms the inlet of the first slurry conveying channel (62). A guide tube (55) is provided at the rear end of the flange plate (54). One end of the guide tube (55) is fixedly connected to the flange plate (54) and connected to the powder conveying channel (72). The other end of the guide tube (55) is fixedly connected to the flange plate (54) and forms the inlet of the powder conveying channel (72) on the front end face of the flange plate (54).

10. The atomizing spray gun as described in claim 6, characterized in that: It also includes a second atomizing spray structure (8), which includes a sleeve (81) that is fitted over the outer protective tube (51). A second slurry conveying channel (82) is formed between the sleeve (81) and the outer protective tube (51). A second spiral atomizing module (83) is provided at the front end of the second slurry conveying channel (82). The second spiral atomizing module (83) is an annular block that abuts against the sleeve (81) and the outer protective tube (51) respectively. A number of second spiral grooves (84) are provided on the outer wall of the annular block. The cross-sectional area of ​​the second spiral grooves (84) gradually decreases from the rear end to the front end of the annular block.

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