Rubber dam bag tape with no overlapping seams on the surface and preparation method thereof

Abstract

The present invention belongs to the preparation of rubber dams, and particularly refers to a rubber dam bag tape with no overlap on the surface and its preparation method. It includes the technical steps of double-sided rubbing of rubber-impregnated canvas, preparation of the second tape and the third tape, presetting of the tape, vulcanization and molding, etc. The present invention effectively solves the technical defects of the dam bag tape prepared by the existing process, such as the thick rubber dam sheet at the seam, the large amount of material, the easy vibration under the action of water when the rubber dam project is installed, and the poor sealing effect due to the difficulty of leveling the anchor. The dam bag tape has the advantages of smooth surface, simple process, good sealing effect during use, and high safety factor.

Description

Technical Field

[0001] The invention belongs to the preparation of a rubber dam, in particular to a dam bag adhesive tape of a rubber dam with no overlapping seams on the surface and a preparation method thereof. Background Art

[0002] Rubber dam is a low-head water retaining structure that appeared in the 1950s to meet the needs of industrial and agricultural production. my country started to study rubber dam technology in 1965 and built the first batch of rubber dams in China in 1966. Compared with steel gates, rubber dams have the advantages of long single span, simple structure, short construction period, low cost, good seismic performance of dam bags, simple operation and low management cost. Rubber dams include three parts: rubber dam bags, dam bag anchoring system, and filling and drainage and control system, and the rubber dam bag is the main body of the rubber dam. The definition of rubber dam in "Technical Specifications for Rubber Dam Engineering" (GB / T50979-2014) and "Rubber Dam Bag" (SL554-2011) is: the dam bag is anchored on the bottom plate or end wall according to the design requirements to form a closed bag body, and the bag-type water retaining dam is controlled by filling and draining (gas) to control its lifting and lowering activities. The above standards put forward clear requirements for the planning, design, construction, repair of rubber dams and the performance of dam bag tapes. The following technical terms are also stipulated:

[0003] 1. Overlap: The two ends of the canvas overlap each other, and the bonding joints are not on the same plane; the dam bag needs to overlap and bond the two ends of the tape in the weft direction of the tape, that is, along the length of the dam, which is called overlap. According to the different bonding methods of the joints, it can be divided into overall overlap and staggered overlap; according to whether the joints are exposed, it can be divided into external overlap (with overlap seams on the surface) and internal overlap (without overlap seams on the surface).

[0004] 2. Dipping: The canvas is immersed in and passed through the latex dipping liquid in the dipping tank. After a certain period of contact, it leaves the liquid surface and is dried, heat-stretched and heat-set to form a complete film on the surface of the canvas fiber.

[0005] Rubber dam bags are made by vulcanizing canvas and other skeleton materials together with various layers of rubber using special vulcanizing equipment and a certain process flow, and then splicing them into tape products of designed size. Dam bags are divided into one cloth and two rubbers, two cloths and three rubbers, three cloths and four rubbers, etc. according to the composition structure of the tape. At present, the height of rubber dams on the market is mostly 2-4 meters, so the dam bag structure mostly adopts two cloths and three rubbers and three cloths and four rubbers. Canvas is the main force-bearing part of the dam bag tape. The radial tension of the dam bag is calculated according to the dam height, so as to determine the canvas model used in the dam bag. The width of the tape also depends on the width of the canvas and the manufacturing equipment. The width of the canvas produced by domestic enterprises is mostly 0.95-1.3 meters, resulting in the finished dam bag having a lap seam every interval of one cloth width along the length of the dam. The bonding strength and treatment method at the lap seam directly affect the service life of the dam bag and the overall aesthetics of the rubber dam project.

[0006] Rubber dam bag tape can be divided into two types according to the different overlapping methods: surface seam dam bag and surface seamless dam bag, and their manufacturing processes are different. Surface seam dam bag is formed by cold gluing or hot pressing single piece of tape; surface seamless dam bag is formed by layering and calendering the impregnated canvas, then compounding and vulcanizing in sections.

[0007] The cold bonding process is to vulcanize at least two layers of canvas, an intermediate rubber layer, an outer covering rubber layer and an inner covering rubber layer into a single width of dam bag tape, and cut it along the radial direction (width of the dam bag tape). The number of single widths of tape is determined according to the length of the dam bag. The single width of dam bag tape is roughened within the overlapping range on both sides (the overlapping length is determined according to the height of the rubber dam), and finally the self-flowing glue is brushed on the roughened range. After the glue is dry, the single width of dam bag tape that needs to be overlapped is bonded together, and the bonding part is rolled with an iron rod until it is spliced ​​to the length of the dam bag. The advantage of cold bonding is that there will be no secondary vulcanization loss of the tape at the seam, and the overlapping seam length and the dam bag length are not limited. However, the quality of cold bonding is easily affected by ambient temperature, humidity, cleanliness and human factors, and the quality of cold bonding is difficult to control. The tape on the dam bag at the joints is thick, the material consumption is high, and the grinding process increases the labor input. After the rubber dam project is installed, the overall dam bag is not beautiful enough. It is easy to vibrate under the action of water when flowing, and the sealing effect is poor because the anchor is not easy to level.

[0008] The overlapping methods of hot pressing synthesis process are divided into butt joint, overlap, butt overlap and slope overlap, among which:

[0009] Butt joint: The joint is flat, there is no overlap of canvas, and the utilization rate of adhesive tape is high, but the joint is subjected to weft stress, which actually reduces the number of canvas layers (the two-cloth three-adhesive structure actually only has one layer of canvas under stress, and the three-cloth four-adhesive structure actually has only two layers of canvas under stress), and the weft tensile strength of the dam bag is reduced. Moreover, it is difficult to accurately position the adhesive tape layer, which affects the strength of the joint.

[0010] Overlap: The overlapping process is simple, but the thickness of the bonding part is doubled, so the overlapping position is more difficult to fold and anchor, and the utilization rate of the tape is also low.

[0011] Overlap: This form is a combination of butt joint and overlap. In this way, there is an extra layer of tape thickness at the overlap, so the weft tension of the canvas on any end of the tape is not less than the same amount of single tape. However, this method has the same problem as butt joint that the tape is difficult to accurately position.

[0012] Slope overlap: Since it is difficult to accurately align the overlap, the overlap surface is roughened into an inclined surface on the basis of the overlap. The problem is that there is an extra layer of tape at the joint, and the joint needs to be roughened.

[0013] The bonding strength of butt joints and overlap joints is difficult to control, and the weft force after overlap is prone to uneven force; although cold bonding, hot pressing overlap and hot pressing slope overlap can ensure the weft force of the tape at the overlap, the thickness of the dam bag tape is increased at the overlap seam.

[0014] When installing dam bags with seams on the surface, the thickness of the dam bag tape at the seams increases, and improper handling of the anchoring position may cause water or air leakage; the anchoring workload and materials are increased; the overlap width is subject to certain restrictions, affecting the improvement of the overlap strength. Summary of the invention

[0015] The purpose of the present invention is to provide a rubber dam bag adhesive tape with no overlapping seams on the surface and a preparation method thereof. The rubber dam bag adhesive tape prepared by the method of the present invention has no overlapping seams on the surface, good sealing effect and simple operation.

[0016] The overall technical concept of the present invention is:

[0017] The rubber dam bag tape with no overlapping seams on the surface comprises a second tape and a third tape radially stacked from the outside to the inside, an outer rubber layer vulcanized and bonded to the outer surface of the second tape, an inner rubber layer vulcanized and bonded to the inner surface of the third tape, radially adjacent second tapes and third tapes are vulcanized and bonded as a whole, overlapping parts are provided between axially adjacent second tapes and third tapes, and the overlapping parts of axially adjacent second tapes and third tapes are distributed at laterally intervals.

[0018] The preparation method of the rubber dam bag tape with no overlapping seams on the surface comprises the following process steps:

[0019] A. Double-sided rubbing of dipped canvas

[0020] After hot-training the glue, the glue is rubbed on the inner and outer surfaces of the dipped canvas on a calender, and a bonding glue layer is formed on the surface of the dipped canvas to form the first rubber cloth;

[0021] B. Preparation of the second and third adhesive tapes

[0022] The inner and outer surfaces of the first adhesive tape are respectively coated with adhesive and calendered with overlapping portions on both sides along the radial direction to form a third adhesive tape with an inner layer of adhesive and a second adhesive tape with an outer layer of adhesive;

[0023] C. Preset of adhesive tape

[0024] According to the design requirements, the third tape and the second tape are radially overlapped from the inside to the outside, and the axially adjacent second tape and third tape overlapped parts are respectively corresponding and spaced to the required length of the dam bag cloth, and the radial ends of the overlapped tapes are tightened;

[0025] D. Vulcanization molding

[0026] The rubber that has been tightened and overlapped in step C is arranged in a vulcanizer and vulcanized, cooled and demoulded in sequence along the axial direction. The outer rubber layer and the inner rubber layer are liquefied at high temperature and then vulcanized and shaped to form an outer rubber layer and an inner rubber layer respectively. After the bonding rubber layer is liquefied at high temperature, the radially adjacent second rubber tape and the third rubber tape are vulcanized and bonded into one.

[0027] The specific structure and preparation method of the dam bag adhesive tape of the present invention include the following specific process steps and parameters:

[0028] The current dam bag structure mostly adopts two cloths and three rubbers and three cloths and four rubbers. In order to realize the three cloths and four rubbers dam bag structure, the preferred technical implementation means is that a first tape is vulcanized and bonded between the radially adjacent second tape and the third tape, and an overlapping portion is provided between the axially adjacent first tapes, and the axially adjacent first tape overlapping portions, second tape overlapping portions and third tape overlapping portions are distributed in transverse intervals.

[0029] In order to achieve effective bonding of adjacent overlapping tapes and ensure their bonding strength, while maintaining a certain distance between the overlapping axially adjacent structural layers to meet the tensile strength requirements, the preferred technical implementation method is that the width of the overlapping parts of the first tape, the second tape and the third tape is 5-10 cm, and the spacing between the overlapping parts of the first tape, the second tape and the third tape adjacent to each other in the axial direction is 40-60 cm.

[0030] In order to ensure the calendering composite effect of the adhesive layer and the dipped canvas, the preferred technical implementation means is that the hot mixing process conditions in step A are: temperature of 60-70°C, roller distance of 5-6 mm, and time of 5-10 minutes.

[0031] In order to make the dam bag tape meet the standard requirements, the preferred technical implementation means is that the thickness of the outer layer of glue in step B is 2.25-2.5 mm, the thickness of the inner layer of glue is 1.75-2 mm, and the thickness of the adhesive layer is 0.25 mm.

[0032] In order to realize the production of the dam bag structure of three cloths and four rubbers, the preferred technical implementation means is that the step C is to radially stack the third rubber tape, the first rubber tape and the second rubber tape from the inside to the outside according to the design requirements, and the overlapping parts of the axially adjacent second rubber tape, first rubber tape and third rubber tape are respectively corresponding and spaced to the required length of the dam bag cloth, and the radial ends of the overlapped tapes are tightened.

[0033] In order to make the surface of the dam bag tape smoother and the axially adjacent second tape overlap portions have better bonding strength and appearance, the preferred technical implementation means is that the step C is to cover the outer surface of the axially adjacent second tape overlap portions with film.

[0034] Step D is to arrange the rubber that has been tightened and overlapped in step C in a vulcanizer, vulcanize it in the axial direction, cool it and demould it in sequence. The outer layer of rubber or the outer layer of rubber and the film form an outer rubber layer under the action of vulcanization, and the inner layer of rubber forms an inner rubber layer under the action of vulcanization. After the bonding rubber layer is vulcanized, the radially adjacent second rubber tape, the first rubber tape and the third rubber tape are bonded together.

[0035] In order to ensure the vulcanization effect and improve the tensile effect of the overlapped part, so as to meet the tensile effect of the dam bag cloth, the preferred technical implementation means is that the process parameters of the vulcanization in the step D are: the pressure of the upper and lower hot plates of the vulcanizer is not less than 2.5 MPa, the vulcanization temperature is 148-152°C, and the cooling temperature is 80-100°C.

[0036] In order to verify the technical effect of the present invention, in accordance with the requirements of Rubber Dam Bags (SL554-2011), the applicant tested the appearance quality and physical and mechanical properties of the dam bag tape prepared by the method of the present invention.

[0037] The substantial features and significant technical advances achieved by the present invention are:

[0038] 1. The width of each layer of cloth at the overlap of the dam bag tape prepared by the method of the present invention is at least 5 cm, which effectively increases the weft tension of each layer of cloth while ensuring the bonding strength, ensuring that the weft tension of canvas on any section of the tape is not less than the same amount as that of a single piece of tape.

[0039] 2. Each layer of tape is tightened. Even if the dipped canvas shortens when heated, the raw tape layer will not be misplaced, thus ensuring the accuracy of the overlap.

[0040] 3. The structural design of the interval distribution of adjacent overlaps makes the overlap seams of each layer of cloth staggered, which ensures the weft tension of each layer of tape while dispersing the force and enhancing the weft tensile strength of the dam bag tape.

[0041] 4. The method of the present invention only requires one vulcanization molding, which effectively reduces the roughening process of the seamed adhesive tape, reduces labor costs, and saves material investment.

[0042] 5. The thickness of the tape at the seams is the same as that at the non-seams. No special treatment is required at the anchoring site, which reduces labor costs and the use of sealing materials.

[0043] 6. The surface of the dam bag tape prepared by the method of the present invention has no seam marks, and the thickness of the dam bag is uniform. When anchoring the rubber dam, the sealing effect is better, the operation is simpler, and there will be no consequences of vibration of the dam bag during overcurrent, and the appearance is beautiful.

[0044] 7. According to the applicant's test, compared with the seamed dam bags which can only process rubber dams below 5m in height, the dam bag tape prepared by the method of the present invention can be used to make rubber dam bags with a height of 5-7m. The dam bags have a high safety factor and high economic value. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] The accompanying drawings of the present invention include:

[0046] Figure 1 It is a schematic diagram of the cross-sectional structure of the first adhesive tape in the present invention.

[0047] Figure 2 It is a schematic diagram of the cross-sectional structure of the second adhesive tape in the present invention.

[0048] Figure 3 It is a schematic structural diagram of the third adhesive tape in the present invention.

[0049] Figure 4A The present invention is a schematic diagram of the cross-sectional structure of a dam bag adhesive tape having a three-cloth and four-rubber structure prepared by the method of the present invention before being vulcanized.

[0050] Figure 4B The present invention is a schematic diagram of the cross-sectional structure of a dam bag adhesive tape with a structure of three cloths and four adhesives prepared by the method of the present invention.

[0051] Figure 5A The present invention is a schematic diagram of the cross-sectional structure of a dam bag adhesive tape having a two-cloth and three-rubber structure prepared by the method of the present invention before being vulcanized.

[0052] Figure 5B The present invention is a schematic diagram of the cross-sectional structure of a dam bag adhesive tape with a structure of two cloths and three adhesives prepared by the method of the present invention.

[0053] The reference numerals in the accompanying drawings are as follows:

[0054] 1. Dipped canvas; 2. Adhesive layer; 3. Outer layer of glue; 4. Inner layer of glue; 5. Film; 6. Outer layer of glue; 7. Inner layer of glue. DETAILED DESCRIPTION

[0055] The present invention is further described below in conjunction with the examples, but is not intended to limit the present invention. The protection scope of the present invention shall be subject to the contents of the claims, and any replacement of equivalent technical means made according to the description shall not depart from the protection scope of the present invention. Example 1

[0056] The rubber dam in this embodiment is 4 meters high, has an internal pressure ratio of 1.3, is 50 meters long, is blue in color, and is water-filled; the dam bag model is JBD4.0-240240-3, and the model explanation indicates that nylon cloth is used, the nylon cloth model is J240240, the dam height is 4m, the radial strength of each layer of canvas is 240kN / m, the weft strength of each layer of canvas is 240kN / m, and the number of canvas layers is 3; according to the dam bag model parameter table of "Rubber Dam Bag" (SL554-2011), the radial strength of the JBD4.0-240240-3 dam bag is 540kN / m, and the weft strength is 540kN / m.

[0057] The structure of the prepared dam bag adhesive tape is as follows: Figure 4A , 4B , is a three-cloth four-rubber structure, and the arrow direction in the figure is the movement direction of the upper and lower hot plates of the vulcanizer before vulcanization. It includes a second rubber tape and a third rubber tape stacked radially from outside to inside, an outer rubber layer 6 vulcanized and bonded to the outer surface of the second rubber tape, an inner rubber layer 7 vulcanized and bonded to the inner surface of the third rubber tape, a first rubber tape vulcanized and bonded between the radially adjacent second rubber tape and the third rubber tape, and the radially adjacent second rubber tape and the third rubber tape are vulcanized and bonded as a whole, and overlapping parts are provided between the axially adjacent first rubber tapes, the second rubber tapes, and the third rubber tapes, and the overlapping parts of the axially adjacent first rubber tapes, second rubber tapes, and third rubber tapes are distributed at intervals in the horizontal direction.

[0058] The width of the overlapping parts of the first adhesive tape, the second adhesive tape and the third adhesive tape is 5-10 cm, and the spacing between the overlapping parts of the first adhesive tape, the second adhesive tape and the third adhesive tape adjacent to each other in the axial direction is 40-60 cm.

[0059] The preparation method of the rubber dam bag tape with no overlapping seams on the surface comprises the following process steps:

[0060] A. Double-sided rubbing of dipped canvas

[0061] After the glue is hot-trained, the glue is rubbed on the inner and outer surfaces of the dipped canvas on a calender, and a bonding glue layer 2 is formed on the surface of the dipped canvas to form a first adhesive tape;

[0062] B. Preparation of the second and third adhesive tapes

[0063] The inner and outer surfaces of the first adhesive tape are respectively coated with adhesive and calendered with overlapping portions on both sides along the radial direction to form a third adhesive tape containing an inner layer of adhesive 4 and a second adhesive tape containing an outer layer of adhesive 3;

[0064] C. Preset of adhesive tape

[0065] According to the design requirements, the third tape, the first tape and the second tape are radially stacked from the inside to the outside, and the overlapping parts of the axially adjacent third tape, the first tape and the second tape are respectively corresponding and spaced to the required length of the dam bag cloth, and the outer surface of the overlapping part of the axially adjacent second tape is covered with a film 5, and the radial ends of the overlapping tapes are tightened;

[0066] D. Vulcanization molding

[0067] The rubber layer 3 and the rubber sheet 5 are liquefied at high temperature and then vulcanized and formed to form an outer rubber layer 6. The inner rubber layer 4 is liquefied at high temperature and then vulcanized and formed to form an inner rubber layer 7. The bonding rubber layer 2 is liquefied at high temperature and then the radially adjacent second rubber tape, first rubber tape and third rubber tape are vulcanized and bonded into one.

[0068] The hot mixing process conditions in step A are: temperature of 70° C., roller distance of 6 mm, and time of 10 minutes.

[0069] In step B, the thickness of the outer layer of glue 3 is 2.5 mm, the thickness of the inner layer of glue 4 is 2 mm, and the thickness of the bonding glue layer 2 is 0.25 mm.

[0070] The process parameters of vulcanization in step D are: the pressure of the upper and lower hot plates of the vulcanizer is not less than 2.5 MPa, the vulcanization temperature is 148-152°C, and the cooling temperature is 80-100°C. Example 2

[0071] The rubber dam in this embodiment is 2.5 meters high, has an internal pressure ratio of 1.4, is 70 meters long, is blue in color, and is water-filled; the dam bag model is JBD2.5-180160-2, and the model explanation indicates that nylon cloth is used, the nylon cloth model is J180160, the dam height is 2.5m, the radial strength of each layer of canvas is 180kN / m, the weft strength of each layer of canvas is 160kN / m, and the number of canvas layers is 2; according to the dam bag model parameter table of "Rubber Dam Bag" (SL554-2011), the radial strength of the JBD2.5-180160-2 dam bag is 288kN / m, and the weft strength is 256kN / m.

[0072] The structure of the prepared dam bag adhesive tape is as follows: Figure 5A , 5B, which is a two-cloth and three-rubber structure. The arrow direction in the figure is the movement direction of the upper and lower hot plates of the vulcanizer before vulcanization. The rubber dam bag tape with no overlap on the surface includes a second tape and a third tape radially stacked from outside to inside, an outer rubber layer 6 vulcanized and bonded to the outer surface of the second tape, and an inner rubber layer 7 vulcanized and bonded to the inner surface of the third tape. The radially adjacent second tapes and third tapes are vulcanized and bonded as a whole, and overlap portions are provided between the axially adjacent second tapes and the third tapes. The overlap portions of the axially adjacent second tapes and third tapes are distributed at intervals in the transverse direction.

[0073] The preparation method of the rubber dam bag tape with no overlapping seams on the surface comprises the following process steps:

[0074] A. Double-sided rubbing of dipped canvas

[0075] After the glue is hot-trained, the glue is rubbed on the inner and outer surfaces of the dipped canvas on a calender, and a bonding glue layer 2 is formed on the surface of the dipped canvas to form a first adhesive tape;

[0076] B. Preparation of the second and third adhesive tapes

[0077] The inner and outer surfaces of the first adhesive tape are respectively coated with adhesive and calendered with overlapping portions on both sides along the radial direction to form a third adhesive tape containing an inner layer of adhesive 4 and a second adhesive tape containing an outer layer of adhesive 3;

[0078] C. Preset of adhesive tape

[0079] According to the design requirements, the third tape and the second tape are radially overlapped from the inside to the outside, and the axially adjacent second tape and third tape overlapped parts are respectively corresponding and spaced to the required length of the dam bag cloth, and the radial ends of the overlapped tapes are tightened;

[0080] D. Vulcanization molding

[0081] The rubber layer 3 and the inner rubber layer 4 are liquefied at high temperature and then vulcanized and shaped to form an outer rubber layer 6 and an inner rubber layer 7 respectively. The bonding rubber layer 2 is liquefied at high temperature and then the radially adjacent second rubber tape and the third rubber tape are vulcanized and bonded together.

[0082] The width of the overlapped portion of the second adhesive tape and the third adhesive tape is 5-10 cm, and the spacing between the overlapped portions of the second adhesive tape and the third adhesive tape adjacent in the axial direction is 40-60 cm.

[0083] The hot mixing process conditions in step A are: temperature of 60° C., roller distance of 5 mm, and time of 5 minutes.

[0084] In step B, the thickness of the outer layer of glue 3 is 2.25 mm, the thickness of the inner layer of glue 4 is 1.75 mm, and the thickness of the adhesive layer 2 is 0.25 mm.

[0085] The step C is to radially overlap the third tape and the second tape from inside to outside according to design requirements, and to correspond and space the overlapping parts of the axially adjacent second tape and third tape in sequence to the required length of the dam bag cloth, and tighten the radial ends of the overlapping tapes.

[0086] The step C is to cover the outer surfaces of the axially adjacent second adhesive tape overlap portions with adhesive film 5.

[0087] Step D is to arrange the rubber that has been tightened and overlapped in step C in a vulcanizer, vulcanize it in the axial direction, cool it and demould it in sequence. The outer layer of rubber 3 and the rubber sheet 5 form an outer rubber layer 6 under the action of vulcanization, and the inner layer of rubber 4 forms an inner rubber layer 7 under the action of vulcanization. After the bonding rubber layer 2 is vulcanized, the radially adjacent second rubber tape and the third rubber tape are bonded together.

[0088] The process parameters of vulcanization in step D are: the pressure of the upper and lower hot plates of the vulcanizer is not less than 2.5 MPa, the vulcanization temperature is 148-152°C, and the cooling temperature is 80-100°C. Example 3

[0089] The rubber dam in this embodiment has a height of 4.0 meters, an internal pressure ratio of 1.35, a length of 100 meters, a black color, and is water-filled; the dam bag model is JBD4.0-260240-3, and the model explanation indicates that nylon cloth is used, the nylon cloth model is J260240, the dam height is 4 meters, the radial strength of each layer of canvas is 260 kN / m, the weft strength of each layer of canvas is 240 kN / m, and the number of canvas layers is 3; according to the dam bag model parameter table of "Rubber Dam Bag" (SL554-2011), the radial strength of the JBD4.0-260240-3 dam bag is 585 kN / m, and the weft strength is 540 kN / m.

[0090] The structure of the prepared dam bag adhesive tape is as follows: Figure 4A , 4B , is a three-cloth four-rubber structure, and the arrow direction in the figure is the movement direction of the upper and lower hot plates of the vulcanizer before vulcanization. It includes a second rubber tape and a third rubber tape stacked radially from outside to inside, an outer rubber layer 6 vulcanized and bonded to the outer surface of the second rubber tape, an inner rubber layer 7 vulcanized and bonded to the inner surface of the third rubber tape, a first rubber tape vulcanized and bonded between the radially adjacent second rubber tape and the third rubber tape, and the radially adjacent second rubber tape and the third rubber tape are vulcanized and bonded as a whole, and overlapping parts are provided between the axially adjacent first rubber tapes, the second rubber tapes, and the third rubber tapes, and the overlapping parts of the axially adjacent second rubber tapes, the first rubber tapes, and the third rubber tapes are distributed at intervals in the horizontal direction.

[0091] The width of the overlapping parts of the first adhesive tape, the second adhesive tape and the third adhesive tape is 5-10 cm, and the spacing between the overlapping parts of the first adhesive tape, the second adhesive tape and the third adhesive tape adjacent to each other in the axial direction is 40-60 cm.

[0092] The preparation method of the rubber dam bag tape with no overlapping seams on the surface comprises the following process steps:

[0093] A. Double-sided rubbing of dipped canvas

[0094] After the glue is hot-trained, the glue is rubbed on the inner and outer surfaces of the dipped canvas on a calender, and a bonding glue layer 2 is formed on the surface of the dipped canvas to form a first adhesive tape;

[0095] B. Preparation of the second and third adhesive tapes

[0096] The inner and outer surfaces of the first adhesive tape are respectively coated with adhesive and calendered with overlapping portions on both sides along the radial direction to form a third adhesive tape containing an inner layer of adhesive 4 and a second adhesive tape containing an outer layer of adhesive 3;

[0097] C. Preset of adhesive tape

[0098] According to the design requirements, the third tape, the first tape and the second tape are radially stacked from the inside to the outside, and the overlapping parts of the axially adjacent third tape, the first tape and the second tape are respectively corresponding and spaced to the required length of the dam bag cloth, and the outer surface of the overlapping part of the axially adjacent second tape is covered with a film 5, and the radial ends of the overlapping tapes are tightened;

[0099] D. Vulcanization molding

[0100] The rubber layer 3 and the rubber sheet 5 are liquefied at high temperature and then vulcanized and formed to form an outer rubber layer 6. The inner rubber layer 4 is liquefied at high temperature and then vulcanized and formed to form an inner rubber layer 7. The bonding rubber layer 2 is liquefied at high temperature and then the radially adjacent second rubber tape, first rubber tape and third rubber tape are vulcanized and bonded into one.

[0101] In order to ensure the calendering composite effect of the adhesive layer and the dipped canvas, the hot mixing process conditions in step A are: temperature of 65° C., roller distance of 6 mm, and time of 8 minutes.

[0102] In step B, the thickness of the outer layer of glue 3 is 2.4 mm, the thickness of the inner layer of glue 4 is 1.9 mm, and the thickness of the adhesive layer 2 is 0.25 mm.

[0103] The step C is to stack the third tape, the first tape and the second tape longitudinally from inside to outside according to design requirements, and to correspond and space the overlapping parts of the axially adjacent second tape, first tape and third tape in sequence to the required length of the dam bag cloth, and to tighten the radial ends of the overlapping tapes.

[0104] The step C is to cover the outer surfaces of the axially adjacent second adhesive tape overlap portions with adhesive film 5.

[0105] Step D is to arrange the rubber that has been tightened and overlapped in step C in a vulcanizer, vulcanize it in the axial direction, cool it and demould it in sequence. The outer layer of rubber 3 and the rubber sheet 5 form an outer rubber layer 6 under the action of vulcanization, and the inner layer of rubber 4 forms an inner rubber layer 7 under the action of vulcanization. After the bonding rubber layer 2 is vulcanized, the radially adjacent second rubber tape, the first rubber tape and the third rubber tape are bonded together.

[0106] The process parameters of vulcanization in step D are: the pressure of the upper and lower hot plates of the vulcanizer is not less than 2.5 MPa, the vulcanization temperature is 148-152°C, and the cooling temperature is 80-100°C. Example 4

[0107] The rubber dam in this embodiment has a height of 3.0 meters, an internal pressure ratio of 1.4, a length of 90 meters, a green color, and is water-filled; the dam bag model is JBD3.0-200200-2, and the model explanation indicates that nylon cloth is used, the nylon cloth model is J200200, the dam height is 4 meters, the radial strength of each layer of canvas is 200 kN / m, the weft strength of each layer of canvas is 200 kN / m, and the number of canvas layers is 2; according to the dam bag model parameter table of "Rubber Dam Bag" (SL554-2011), the radial strength of the JBD3.0-200200-2 dam bag is 320 kN / m, and the weft strength is 320 kN / m.

[0108] The structure of the prepared dam bag adhesive tape is as follows: Figure 5A , 5B , which is a two-cloth and three-rubber structure. The arrow direction in the figure is the movement direction of the upper and lower hot plates of the vulcanizer before vulcanization. The rubber dam bag tape with no overlap on the surface includes a second tape and a third tape radially stacked from outside to inside, an outer rubber layer 6 vulcanized and bonded to the outer surface of the second tape, and an inner rubber layer 7 vulcanized and bonded to the inner surface of the third tape. The radially adjacent second tapes and third tapes are vulcanized and bonded as a whole, and overlap portions are provided between the axially adjacent second tapes and the third tapes. The overlap portions of the axially adjacent second tapes and third tapes are distributed at intervals in the transverse direction.

[0109] The preparation method of the rubber dam bag tape with no overlapping seams on the surface comprises the following process steps:

[0110] A. Double-sided rubbing of dipped canvas

[0111] After the glue is hot-trained, the glue is rubbed on the inner and outer surfaces of the dipped canvas on a calender, and a bonding glue layer 2 is formed on the surface of the dipped canvas to form a first adhesive tape;

[0112] B. Preparation of the second and third adhesive tapes

[0113] The inner and outer surfaces of the first adhesive tape are respectively coated with adhesive and calendered with overlapping portions on both sides along the radial direction to form a third adhesive tape containing an inner layer of adhesive 4 and a second adhesive tape containing an outer layer of adhesive 3;

[0114] C. Preset of adhesive tape

[0115] According to the design requirements, the third tape and the second tape are radially overlapped from the inside to the outside, and the axially adjacent second tape and third tape overlapped parts are respectively corresponding and spaced to the required length of the dam bag cloth, and the radial ends of the overlapped tapes are tightened;

[0116] D. Vulcanization molding

[0117] The rubber layer 3 and the inner rubber layer 4 are liquefied at high temperature and then vulcanized and shaped to form an outer rubber layer 6 and an inner rubber layer 7 respectively. The bonding rubber layer 2 is liquefied at high temperature and then the radially adjacent second rubber tape and the third rubber tape are vulcanized and bonded together.

[0118] The width of the overlapped portion of the second adhesive tape and the third adhesive tape is 5-10 cm, and the spacing between the overlapped portions of the second adhesive tape and the third adhesive tape adjacent in the axial direction is 40-60 cm.

[0119] The hot mixing process conditions in step A are: temperature of 62° C., roller distance of 5.2 mm, and time of 6 minutes.

[0120] In step B, the thickness of the outer layer of glue 3 is 2.3 mm, the thickness of the inner layer of glue 4 is 1.8 mm, and the thickness of the adhesive layer 2 is 0.25 mm.

[0121] The step C is to radially overlap the third tape and the second tape from inside to outside according to design requirements, and to correspond and space the overlapping parts of the axially adjacent second tape and third tape in sequence to the required length of the dam bag cloth, and tighten the radial ends of the overlapping tapes.

[0122] The step C is to cover the outer surfaces of the axially adjacent second adhesive tape overlap portions with adhesive film 5.

[0123] Step D is to arrange the rubber that has been tightened and overlapped in step C in a vulcanizer, vulcanize it in the axial direction, cool it and demould it in sequence. The outer layer of rubber 3 and the rubber sheet 5 form an outer rubber layer 6 under the action of vulcanization, and the inner layer of rubber 4 forms an inner rubber layer 7 under the action of vulcanization. After the bonding rubber layer 2 is vulcanized, the radially adjacent second rubber tape and the third rubber tape are bonded together.

[0124] The process parameters of vulcanization in step D are: the pressure of the upper and lower hot plates of the vulcanizer is not less than 2.5 MPa, the vulcanization temperature is 148-152°C, and the cooling temperature is 80-100°C. Example 5

[0125] The rubber dam in this embodiment has a height of 4.0 meters, an internal pressure ratio of 1.3, a length of 100 meters, a blue color, and is water-filled; the dam bag model is JBD4.0-260260-3, and the model explanation indicates that nylon cloth is used, the nylon cloth model is J260260, the dam height is 4 meters, the radial strength of each layer of canvas is 260 kN / m, the weft strength of each layer of canvas is 260 kN / m, and the number of canvas layers is 3; according to the dam bag model parameter table of "Rubber Dam Bag" (SL554-2011), the radial strength of the JBD4.0-260260-3 dam bag is 585 kN / m, and the weft strength is 585 kN / m.

[0126] The structure of the prepared dam bag adhesive tape is as follows: Figure 4A , 4B , is a three-cloth four-rubber structure, and the arrow direction in the figure is the movement direction of the upper and lower hot plates of the vulcanizer before vulcanization. It includes a second rubber tape and a third rubber tape radially stacked from outside to inside, an outer rubber layer 6 vulcanized and bonded to the outer surface of the second rubber tape, an inner rubber layer 7 vulcanized and bonded to the inner surface of the third rubber tape, a first rubber tape vulcanized and bonded between the radially adjacent second rubber tape and the third rubber tape, and the radially adjacent second rubber tape, the first rubber tape and the third rubber tape are vulcanized and bonded as a whole, and overlapping parts are provided between the axially adjacent first rubber tapes, the second rubber tapes and the third rubber tapes, and the overlapping parts of the axially adjacent second rubber tapes, the first rubber tapes and the third rubber tapes are distributed at intervals in the horizontal direction.

[0127] The width of the overlapping parts of the first adhesive tape, the second adhesive tape and the third adhesive tape is 5-10 cm, and the spacing between the adjacent overlapping parts of the first adhesive tape, the second adhesive tape and the third adhesive tape is 40-60 cm.

[0128] The preparation method of the rubber dam bag tape with no overlapping seams on the surface comprises the following process steps:

[0129] A. Double-sided rubbing of dipped canvas

[0130] After the glue is hot-trained, the glue is rubbed on the inner and outer surfaces of the dipped canvas on a calender, and a bonding glue layer 2 is formed on the surface of the dipped canvas to form a first adhesive tape;

[0131] B. Preparation of the second and third adhesive tapes

[0132] The inner and outer surfaces of the first adhesive tape are respectively coated with adhesive and calendered with overlapping portions on both sides along the radial direction to form a third adhesive tape containing an inner layer of adhesive 4 and a second adhesive tape containing an outer layer of adhesive 3;

[0133] C. Preset of adhesive tape

[0134] According to the design requirements, the third tape, the first tape and the second tape are radially stacked from the inside to the outside, and the overlapping parts of the axially adjacent third tape, the first tape and the second tape are respectively corresponding and spaced to the required length of the dam bag cloth, and the outer surface of the overlapping part of the axially adjacent second tape is covered with a film 5, and the radial ends of the overlapping tapes are tightened;

[0135] D. Vulcanization molding

[0136] The rubber layer 3 and the rubber sheet 5 are liquefied at high temperature and then vulcanized and formed to form an outer rubber layer 6. The inner rubber layer 4 is liquefied at high temperature and then vulcanized and formed to form an inner rubber layer 7. The bonding rubber layer 2 is liquefied at high temperature and then the radially adjacent second rubber tape, first rubber tape and third rubber tape are vulcanized and bonded into one.

[0137] In order to ensure the calendering composite effect of the adhesive layer and the dipped canvas, the hot mixing process conditions in step A are: temperature of 68° C., roller distance of 5.9 mm, and time of 9 minutes.

[0138] In step B, the thickness of the outer layer of glue 3 is 2.4 mm, the thickness of the inner layer of glue 4 is 1.9 mm, and the thickness of the adhesive layer 2 is 0.25 mm.

[0139] The process parameters of vulcanization in step D are: the pressure of the upper and lower hot plates of the vulcanizer is not less than 2.5 MPa, the vulcanization temperature is 148-152°C, and the cooling temperature is 80-100°C.

[0140]

[0141] It can be seen from the above experiments that the overlap strength index of the overlapped parts of the dam bag tapes prepared in Examples 1-5 is not less than the designed strength in the weft direction of the dam bag.

Claims

1. A method for preparing a rubber dam bag tape with no overlapping seams on the surface, characterized in that A rubber dam bag tape with no overlapping seams on the surface, comprising a second tape and a third tape stacked from outside to inside, an outer rubber layer (6) vulcanized and bonded to the outer surface of the second tape, an inner rubber layer (7) vulcanized and bonded to the inner surface of the third tape, adjacent second tapes and third tapes are vulcanized and bonded as one, overlapping portions are provided between adjacent second tapes and third tapes, first tapes are vulcanized and bonded between adjacent second tapes and third tapes, overlapping portions are provided between adjacent first tapes, and adjacent overlapping portions of the first tapes, second tapes and third tapes are spaced apart in the horizontal direction; The preparation method of the rubber dam bag tape with no overlapping seams on the surface comprises the following process steps: A. Double-sided rubbing of dipped canvas After the glue is heated and refined, the glue is rubbed on the inner and outer surfaces of the dipped canvas on a calender, and a bonding glue layer (2) is formed on the surface of the dipped canvas to form a first adhesive tape, and the thickness of the bonding glue layer (2) is 0.25 mm; B. Preparation of the second and third adhesive tapes The inner and outer surfaces of the first adhesive tape are respectively glued and calendered with overlapping portions on both sides to form a third adhesive tape containing an inner layer of adhesive (4) and a second adhesive tape containing an outer layer of adhesive (3); the thickness of the outer layer of adhesive (3) is 2.25 to 2.5 mm, and the thickness of the inner layer of adhesive (4) is 1.75 to 2 mm; C. Preset of adhesive tape According to design requirements, the third adhesive tape, the first adhesive tape and the second adhesive tape are stacked from the inside to the outside, and the adjacent overlapping parts of the second adhesive tape, the first adhesive tape and the third adhesive tape are respectively aligned and spaced to the required length of the dam bag cloth, and the outer surface of the adjacent overlapping parts of the second adhesive tape is covered with a film (5), and the radial ends of the overlapping adhesive tapes are tightened; D. Vulcanization molding The rubber sheets that have been stretched and overlapped in step C are placed in a vulcanizer and vulcanized in the overlapping direction, cooled and demoulded in sequence. The outer rubber layer (3) or the outer rubber layer (3) and the rubber sheet (5) form an outer rubber layer (6) under the action of vulcanization. The inner rubber layer (4) forms an inner rubber layer (7) under the action of vulcanization. After the bonding rubber layer (2) is vulcanized, the adjacent second rubber sheet, the first rubber sheet and the third rubber sheet are bonded together.

2. The method for preparing the rubber dam bag tape with no overlapped seams on the surface according to claim 1, characterized in that The width of the overlapping parts of the first adhesive tape, the second adhesive tape and the third adhesive tape is 5 to 10 centimeters, and the distance between the overlapping parts of the adjacent first adhesive tape, the second adhesive tape and the third adhesive tape is 40 to 60 centimeters.

3. The method for preparing the rubber dam bag tape with no overlapped seams on the surface according to claim 1, characterized in that The hot mixing process conditions in step A are: temperature of 60-70° C., roller distance of 5-6 mm, and time of 5-10 minutes.

4. The method for preparing the rubber dam bag tape with no overlapped seams on the surface according to claim 1, characterized in that The process parameters of vulcanization in step D are: the pressure of the upper and lower hot plates of the vulcanizer is not less than 2.5 MPa, the vulcanization temperature is 148-152°C, and the cooling temperature is 80-100°C.

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