A crack repair cloth and its preparation device

Abstract

The present application relates to the technical field of building construction, and discloses a crack repair cloth and a preparation device therefor. The crack repair cloth includes an elastic cloth layer and a plastic cloth layer, and the elastic cloth layer and the plastic cloth layer are connected through a composite adhesive layer. The coating amount of the composite adhesive layer is 110 g / m² - 120 g / m². A hot melt adhesive buffer layer is provided on the side of the elastic cloth layer away from the plastic cloth layer, and the coating amount of the hot melt adhesive buffer layer is 140 g / m² - 160 g / m². The crack repair cloth can improve the crack resistance effect of crack repair.

Description

Technical Field

[0001] The present application relates to the technical field of building construction, and in particular to a crack repair cloth and a preparation device thereof. Background Art

[0002] Cracks of varying degrees frequently occur in building structures. Although some cracks do not reach the dangerous level of causing the building to collapse, the cracks in the structure can cause leakage, corrosion, concrete carbonization, etc., thereby reducing the durability of building components and even posing a serious potential threat to the safety and reliability of the structure. Therefore, timely repair treatment should be carried out on building cracks to reduce the hidden problems brought by the cracks.

[0003] The common method for repairing building cracks is to adopt a surface covering repair method for the cracks, that is, applying cement slurry or epoxy putty on the surface of the cracks for plugging. After the cement slurry or epoxy putty is cured and plugged, the formed plugging part is a rigid connection. When the repaired crack releases stress due to thermal expansion and contraction or external force, etc., the plugging part is easily torn open, that is, the anti-cracking effect after repair is poor. Therefore, polyester fiberglass cloth is usually pasted at the crack during building crack repair. Polyester fiberglass cloth is a mixture of glass fiber and polyester, and has the strength of glass fiber and the flexibility of polyester fiber, which can improve the anti-cracking effect at the repaired crack. However, as the carrier directly bearing the crack splitting stress, the anti-cracking effect of polyester fiberglass cloth is only generated based on the material properties of the polyester fiberglass cloth itself, the anti-cracking effect is single, and the crack splitting stress is easily directly beyond the load limit of the polyester fiberglass, directly causing the polyester fiberglass cloth to be torn and reducing the repair anti-cracking effect. Summary of the Invention

[0004] In order to improve the anti-cracking effect of crack repair, the present application provides a crack repair method and a preparation device thereof.

[0005] On the one hand, a building crack repair method provided by the present application adopts the following technical solution:

[0006] A crack repair cloth, comprising a plastic cloth layer and an elastic cloth layer, wherein the plastic cloth layer and the elastic cloth layer are connected through a composite glue layer, the coating amount of the composite glue layer is 110 g / m 2 -120 g / m 2 , a hot melt adhesive buffer layer is provided on the side of the elastic cloth layer away from the plastic cloth layer, and the coating amount of the hot melt adhesive buffer layer is 140 g / m 2 -160 g / m 2 .

[0007] Through the above technical solution, the crack repair cloth adopts a double-layer structure of an elastic cloth layer and a plastic cloth layer. During the pre-cracking process of the crack, the cracking stress first passes through the elastic cloth layer and then is feedback to the plastic cloth layer. The elastic cloth layer disperses the cracking stress, weakens the direct impact of the cracking stress on the plastic cloth layer, reduces the possibility of cracking of the plastic cloth layer, that is, reduces the cracking phenomenon on the outer surface after crack repair. At the same time, the elastic force of the plastic cloth layer is less than that of the elastic cloth layer. The plastic cloth layer can assist in shaping and limiting the elastic cloth layer, dispersing the force on the elastic cloth layer, and reducing the phenomenon of the decrease in the elastic dispersion effect caused by excessive deformation of the elastic cloth layer. Through the mutual cooperation of two different crack-resistant effect materials, the crack resistance effect of the crack repair cloth is significantly improved, and the service life of the crack-resistant layer is extended.

[0008] At the same time, since a hot-melt adhesive buffer layer is provided on the side of the elastic cloth layer away from the plastic cloth layer, during the crack fission process, the suddenly generated cracking stress will first pass through the hot-melt adhesive buffer layer and then be feedback to the elastic cloth layer. The hot-melt adhesive buffer layer buffers the sudden release of the cracking stress, reduces the direct impact of the cracking stress on the elastic cloth layer, and reduces the possibility of excessive deformation of the elastic cloth layer, so as to improve the crack resistance effect and extend the crack-resistant service life.

[0009] And during the application process, in order to achieve the buffering effect, the hot-melt adhesive buffer layer needs to be provided on the elastic cloth layer in the form of a full coating to effectively play a buffering role. Therefore, when using hot-melt adhesive as the buffer layer, the requirement for its coating amount is relatively high. Because if the hot-melt adhesive coating is too thin, it can only achieve the hot-melt gluing effect and cannot play a buffering role. However, the thicker the hot-melt adhesive layer is not, the better the buffering effect is. Because if the hot-melt adhesive is coated too thickly, there will be an overly thick adhesive layer between the elastic cloth layer and the crack substrate to be repaired. For the hot-melt adhesive with insufficient cohesion, it will instead lead to a decrease in the bonding strength, resulting in a decrease in the stability of the composite structure, a decrease in the stability of the crack repair structure, and a decrease in the crack resistance effect. Therefore, the coating amount of the hot-melt adhesive buffer layer should be 140g / m 2 -160g / m 2 to achieve buffering.

[0010] Optionally, the plastic cloth layer is a polyester-cotton cloth.

[0011] Polyester-cotton cloth is a polyester-cotton blended fabric, with polyester as the main component, woven from a blended yarn of 65%-67% polyester and 33%-35% cotton. It has high fiber strength, stable dimensions, good abrasion resistance, and a flat cloth surface, which is convenient for composite applications. Moreover, during the construction process of applying the crack repair cloth to crack repair, after the bonding construction of the crack repair cloth is completed, the plastic cloth layer of the crack repair cloth is exposed. To protect the crack repair cloth, strengthen the crack repair cloth, and perform decorative treatment on the exterior wall, it is usually necessary to coat a putty outer layer on the plastic cloth layer of the crack repair cloth. During this process, since polyester fibers are hydrophobic fibers, polyester-cotton cloth has weak water absorption, and the water absorption rate of the putty outer layer coated on the polyester-cotton cloth is low, which can reduce the drying speed of the putty and the water evaporation speed of the putty layer, enabling the surface layer of the putty layer to have sufficient moisture for curing, reducing the powdering phenomenon caused by low water loss curing effect of the putty surface layer, improving the stability of the crack repair structure, and enhancing the crack repair effect.

[0012] Optionally, the elastic cloth layer is a polyester full-lining elastic cloth.

[0013] Elastic cloth is a stretchy greige cloth, which has greater elasticity through rib weave. Polyester full-lining elastic cloth, namely polyester elastic cloth, not only has high elasticity, but also has high strength, high impact resistance, and is wear-resistant and corrosion-resistant. Therefore, it can not only effectively disperse the cracking stress of cracks, but also is convenient for construction and is not easily affected by construction environmental factors.

[0014] Optionally, a peelable layer is provided on the surface of the hot melt adhesive buffer layer away from the elastic cloth layer.

[0015] Through the above technical solution, the peelable layer can protect the flatness, cleanliness, and surface adhesiveness of the hot melt adhesive layer, simplifying the subsequent construction process of applying the crack repair cloth for crack repair.

[0016] Optionally, the crack repair cloth is also provided with exhaust holes, and the exhaust holes penetrate through the plastic cloth layer, composite adhesive layer, elastic cloth layer, and hot melt adhesive buffer layer at one time.

[0017] When attaching and covering the crack repair cloth to the crack, it is necessary to ensure that the crack repair cloth is bonded flatly and completely with the building base around the crack, and no bubbles, wrinkles, etc. are allowed to appear on the surface of the crack repair cloth. The design of the exhaust holes can expel the gas between the crack repair cloth and the building base around the crack during the fitting process of the crack repair cloth, improving the surface flatness after the crack repair cloth is fitted, enhancing the fitting effect, and thus improving the application construction efficiency of the crack repair cloth.

[0018] On the other hand, the present application also provides a preparation device for the above-mentioned crack repair cloth.

[0019] A preparation device for a crack repair cloth, comprising:

[0020] A plastic cloth unwinding roller;

[0021] A coating assembly, which is located on the unwinding side of the plastic cloth unwinding roller, and the coating assembly is used for coating the plastic cloth;

[0022] A pressure roller assembly, which is located on the side of the coating assembly away from the plastic cloth unwinding roller;

[0023] A winding roller, which is located on the side of the pressure roller assembly away from the coating assembly;

[0024] An elastic cloth unwinding roller;

[0025] A guiding roller group, which is located on the unwinding side of the elastic cloth unwinding roller, and the guiding roller group is used for pulling the elastic cloth. The discharging side of the guiding roller group is located between the coating assembly and the pressure roller assembly. The elastic cloth pulled by the guiding roller group is attached to the coating surface of the plastic cloth. The guiding roller group includes guiding rollers, and the guiding rollers are provided with guiding air inlet pipes, ventilation grooves communicated with the guiding air inlet pipes, and air outlets communicated with the ventilation grooves, and the air outlets face the elastic cloth. The plastic cloth unwinding roller, the elastic cloth unwinding roller and the winding roller rotate synchronously.

[0026] During the preparation process of the crack repair cloth, it is necessary to perform the lamination between the elastic cloth and the plastic cloth. In the related art, during the lamination, the elastic cloth and the plastic cloth are respectively pulled and tensioned for flat lamination of the elastic cloth and the plastic cloth. Since the elastic cloth has the characteristic of elastic deformation, if the pulling and tensioning force is too large, the elastic cloth will be in an elastic deformation state for a long time during the lamination process, which will cause elastic fatigue of the elastic cloth, resulting in the loss of the elastic characteristics of the elastic cloth, and further reducing the application effect of the elastic cloth in the crack repair cloth and the anti-crack effect of the crack repair cloth.

[0027] Through the preparation device for the crack repair cloth of the present application, the elastic cloth is unwound from the elastic cloth unwinding roller and then pulled by the guiding roller group to be laminated and attached to the coating surface of the plastic cloth unwound from the plastic cloth unwinding roller. The attached elastic cloth and plastic cloth pass through the pressure roller assembly together and are wound on the winding roller. Among them, the coating assembly coats the compound glue on the coating surface of the plastic cloth before the plastic cloth and the elastic cloth are attached. During this process, the plastic cloth unwinding roller, the elastic cloth unwinding roller and the winding roller rotate synchronously, reducing the problem of excessive tension caused by the asynchronous rotation of the plastic cloth unwinding roller, the elastic cloth unwinding roller and the winding roller.

[0028] When the elastic unwinding roller, the plastic unwinding roller, and the winding roller rotate synchronously, the elastic cloth still needs to be guided by the guiding roller group to accurately fit the plastic cloth. If the elastic cloth winds around the roller surface of the guiding roller group, then during the traction and transmission process, friction will occur between the elastic cloth and the roller surface of the guiding roller group. The existence of the friction effect will cause uneven stress on the elastic cloth between the elastic unwinding roller and the winding roller, weaken the rotational synchronization effect between the elastic unwinding roller and the winding roller, and also increase the tension of the elastic cloth, reducing the performance of the elastic cloth. For this reason, in this application, a ventilation groove structure is provided on the guiding roller of the guiding roller group, and the air outlet communicating with the ventilation groove faces the elastic cloth. After the gas is introduced into the ventilation groove, the gas is blown out from the air outlet, forming an air layer on the roller surface of the guiding roller. The elastic cloth and the guiding roller are in traction contact through the air layer. The air layer reduces the contact friction between the guiding roller and the elastic cloth, that is, reduces the traction friction; moreover, by changing the air pressure of the gas, the range and strength of the air layer on the roller surface of the guiding roller can be changed to adapt to the tension state of the elastic force.

[0029] Optionally, the ventilation grooves extend along the axial direction of the guiding roller, the air outlets are evenly distributed on the roller surface of the guiding roller, and an arc-shaped connecting groove is formed between the air outlet and the ventilation groove. Each air outlet and the ventilation groove are communicated through the arc-shaped connecting groove.

[0030] A gas path is formed in the guiding roller through the ventilation groove, the arc-shaped connecting groove, and the air outlet. After the gas passes through the ventilation groove, the arc-shaped connecting groove will first guide the gas to disperse, and then the gas is blown out from the air outlet, making the gas blown out from the air outlet disperse evenly, improving the uniformity of the air layer formed by the gas blown out from the air outlet, and improving the traction uniformity of the guiding roller on the elastic cloth.

[0031] Optionally, it further includes a scraper assembly, and the scraper assembly is located between the discharge side of the guiding roller group and the feed side of the pressing roller group.

[0032] The fitting flatness between the plastic cloth and the elastic cloth directly affects the crack resistance effect of the subsequent crack repair cloth applied to crack repair. Therefore, in order to improve the fitting flatness between the plastic cloth and the elastic cloth, this application provides a scraper assembly between the discharge side of the guiding roller group and the feed side of the pressing roller group. After the plastic cloth and the elastic cloth are fitted, the scraper assembly can level the surfaces of the plastic cloth and the elastic cloth to improve the fitting flatness.

[0033] Optionally, the scraper assembly includes an upper scraper and a lower scraper, and a passing gap is formed between the upper scraper and the lower scraper for the elastic cloth and the plastic cloth to pass through; the upper scraper is provided with a scraper air cavity, a scraper air inlet pipe connected to the scraper air cavity and a scraper air outlet connected to the scraper air cavity, the scraper air outlet of the upper scraper faces the elastic cloth, and the air outlet direction of the scraper air outlet of the upper scraper is opposite to the conveying direction of the elastic cloth; the structure of the lower scraper is consistent with that of the upper scraper, the scraper air outlet of the lower scraper faces the plastic cloth, and the air outlet direction of the scraper air outlet of the lower scraper is opposite to the conveying direction of the plastic cloth.

[0034] The flattening force of the scraper assembly directly flattens the elastic fabric, which can easily cause pulling on the elastic fabric, increase the tension on the elastic fabric, and reduce the performance of the elastic fabric. To this end, the present application provides a scraper air cavity and a scraper air outlet connected to the scraper air cavity on the scraper assembly. The wind blown out by the scraper air outlet can form a wind plate on the scraper assembly in the opposite direction of the elastic fabric transmission direction, and the elastic fabric is "scraped flat" by the wind plate. The air pressure of the wind plate can effectively flatten the elastic fabric. The gas passes through the surface of the elastic fabric, which will drive the gas between the elastic fabric and the plastic fabric to flow away from the pressure roller assembly, reducing the problem of bubbles that are easy to exist when the pressure roller is attached between the elastic fabric and the plastic fabric. At the same time, the wind plate is a non-direct physical contact flattening method, which can reduce the contact pulling on the elastic fabric, reduce friction, and reduce the tension on the elastic fabric.

[0035] Optionally, the inner diameter of the scraper air cavity gradually decreases along the air outlet direction.

[0036] The inner diameter of the scraper air cavity gradually decreases along the air outlet direction, which can gradually increase the gas pressure passing through the scraper air cavity, increase the air pressure blown out of the scraper air outlet nozzle, and enhance the flattening effect of the scraper.

[0037] In summary, this application includes at least one of the following beneficial technical effects:

[0038] 1. The crack repair cloth is composed of an elastic cloth layer, a plastic cloth layer and a hot melt adhesive buffer layer. The three have different repair and anti-cracking effects. The overall crack repair and anti-cracking effect of the crack repair cloth is improved through the coordination between the three different repair and anti-cracking effects.

[0039] 2. The plastic cloth layer of the crack repair cloth uses polyester-cotton cloth. During the construction process of the building crack repair method, the reinforcement layer is compounded on top of the polyester-cotton cloth. When compounding the reinforcement layer, putty is applied first, and then the reinforcement layer is pressed into the putty layer. After the putty layer dries completely, the compounding of the reinforcement layer is completed. During this process, since polyester fiber is a hydrophobic fiber, the polyester-cotton cloth has weak water absorption, and the water absorption rate of the putty layer coated on the polyester-cotton cloth is low. This can reduce the drying speed of the putty and the water evaporation speed of the putty layer, enabling the surface layer of the putty layer to have sufficient moisture for curing, reducing the powdering phenomenon caused by low curing effect due to water loss in the putty surface layer, improving the composite stability of the reinforcement layer on the polyester-cotton cloth (crack-resistant layer), enhancing the crack-resistant reinforcement effect, improving the stability of the crack repair structure, and improving the crack repair effect.

[0040] 3. The preparation device of the crack repair cloth is used for the tension-free compounding between the plastic cloth layer and the elastic cloth layer. Through the preparation device of the crack repair cloth, the loss of elastic properties caused by excessive traction tension during the compounding process of the elastic cloth layer can be reduced, and the crack-resistant effect of the obtained crack repair cloth can be improved. Brief Description of the Drawings

[0041] Figure 1 is the structural schematic diagram of Embodiment 1 of the present application.

[0042] Figure 2 is the structural schematic diagram of Embodiment 4 of the present application.

[0043] Figure 3 is the structural schematic diagram of the guide roller of Embodiment 4 of the present application.

[0044] Figure 4 is Figure 2 the enlarged view of the structure at A in, used to show the cross-sectional structure of the guide roller.

[0045] Figure 5 is the structural schematic diagram of the upper squeegee of Embodiment 4 of the present application.

[0046] Figure 6 is Figure 2 the enlarged view of the structure at B in, used to show the cross-sectional structure of the upper squeegee.

[0047] Description of reference numerals: 1, plastic cloth layer; 2, elastic cloth layer; 3, composite adhesive layer; 4, hot melt adhesive buffer layer; 5, peelable layer; 6, exhaust hole; 7, frame; 8, elastic cloth unwinding roller; 9, plastic cloth unwinding roller; 10, coating assembly; 11, guide roller; 111, mounting plate; 112, guide air inlet connecting pipe; 113, ventilation groove; 114, air outlet; 115, arc connecting groove; 116, communication groove; 12, scraper assembly; 121, upper scraper; 122, lower scraper; 123, scraper support; 124, scraper air inlet connecting pipe; 125, scraper air cavity; 13, pressure roller assembly; 131, upper pressure roller; 132, lower pressure roller; 14, winding roller. Detailed implementation manners

[0048] The following further describes the present application in conjunction with the attached Figures 1-6 drawings.

[0049] Embodiment 1

[0050] Referring to Figure 1 , a crack repair cloth includes a plastic cloth layer 1 and an elastic cloth layer 2. The plastic cloth layer 1 and the elastic cloth layer 2 are connected by a composite adhesive layer 3. The coating amount of the composite adhesive layer 3 is 115 g / m 2 . The composite adhesive used for the composite adhesive layer 3 can also be a hot melt adhesive; a hot melt adhesive buffer layer 4 is provided on the side of the elastic cloth layer 2 away from the plastic cloth layer 1. The coating amount of the hot melt adhesive buffer layer 4 is 140 g / m 2 ; a peelable layer 5 is laminated on the side of the hot melt adhesive buffer layer 4 away from the elastic cloth. The peelable layer 5 is a release paper. Exhaust holes 6 penetrating through the plastic cloth layer, the composite adhesive layer, the elastic cloth layer and the hot melt adhesive buffer layer are also provided on the crack repair cloth.

[0051] The preparation method of the crack repair cloth is as follows:

[0052] Select a polyester cotton cloth as the plastic cloth layer 1. First, take the plastic cloth layer 1 as the coating base, and apply the composite adhesive on one side of the plastic cloth layer 1 according to the coating amount requirement to form a composite adhesive layer 3 on the plastic cloth layer 1; take the plastic cloth layer 1 as the coating base because the plastic cloth layer 1 has relatively high structural stability and strong bearing capacity for the composite adhesive coating, and will not be overly deformed due to the composite adhesive coating, so as to ensure the structural stability of the subsequent materials.

[0053] Select polyester full-lining elastic fabric as the elastic fabric layer 2, and use the non-tension composite method to composite the elastic fabric layer 2 on the composite adhesive layer 3 to complete the composite bonding of the plastic fabric layer 1 and the elastic fabric layer 2; because the elastic fabric layer 2 has the characteristics of elastic deformation, the non-tension composite method can reduce the premature excessive deformation phenomenon of the elastic fabric layer 2 caused by the traction tension during the composite process, reduce the elastic fatigue phenomenon of the elastic fabric layer caused by the long-term traction tension, and reduce the problem of the decline in the crack repair effect of the crack repair cloth caused by the decrease in the elastic performance of the elastic fabric.

[0054] Then, according to the coating amount requirement, apply hot melt adhesive on the side of the elastic fabric layer 2 away from the plastic fabric layer 1 to form a hot melt adhesive buffer layer 4 on the side of the elastic fabric layer 2 away from the plastic fabric layer 1. At this time, because the elastic fabric layer 2 and the plastic fabric layer 1 have been composite-bonded, the structural stability of the plastic fabric layer 1 has a structural stability assisting effect on the elastic deformation of the elastic fabric layer 2, improving the coating bearing capacity of the elastic fabric layer 2 and reducing the influence of the application of the hot melt adhesive on the performance of the elastic fabric layer 2.

[0055] After the hot melt adhesive buffer layer 4 is coated, a release paper is composite on the side of the hot melt adhesive buffer layer 4 away from the elastic fabric layer 2 to complete the composite of the peelable layer 5 and obtain the crack repair cloth. The release paper can protect the flatness, cleanliness, and surface stickiness of the surface of the hot melt adhesive layer, simplifying the construction process of the subsequent crack repair application of the crack repair cloth.

[0056] Finally, perform laser drilling on the crack repair cloth to form a plurality of exhaust holes 6. Each exhaust hole 6 is arranged in a matrix on the surface of the crack repair cloth, and the distance between adjacent exhaust holes 6 is controlled to be about 15 mm. If the distance is too small and the exhaust holes 6 are too dense, the structural stability of the crack repair cloth will be reduced. If the distance is too large, the exhaust effect of the exhaust holes 6 is low, and the fitting flatness of the crack repair cloth will be reduced.

[0057] When the crack repair cloth is used for crack repair: first, remove and clean the original decorative layer of the building base on the periphery of the crack, then perform crack filling treatment, clean the impurities again, level and cure the surface of the building base with putty, then apply a composite agent on the leveling surface of the putty, then remove the peelable layer of the crack repair cloth, paste the crack repair cloth, and finally apply putty on the surface of the crack repair cloth to form a putty surface layer. After the putty dries, perform sanding and decoration to complete the crack repair construction.

[0058] Example 2

[0059] A crack repair cloth, different from Example 1 in that: in Example 2, the coating amount of the hot melt adhesive buffer layer is 150 g / m 2 .

[0060] Example 3

[0061] A crack repair cloth, different from that in Example 1 in that: in Example 3, the coating amount of the hot melt adhesive buffer layer is 160 g / m 2 .

[0062] Comparative Example 1

[0063] A crack repair cloth, different from that in Example 1 in that: in Comparative Example 1, the plastic cloth layer is replaced with an elastic cloth layer.

[0064] Comparative Example 2

[0065] A crack repair cloth, different from that in Example 1 in that: in Comparative Example 2, the elastic cloth layer is replaced with a plastic cloth layer.

[0066] Comparative Example 3

[0067] A crack repair cloth, different from that in Example 1 in that: in Comparative Example 3, the plastic cloth layer is made of cotton cloth.

[0068] Comparative Example 4

[0069] A crack repair cloth, different from that in Example 1 in that: in Comparative Example 4, the coating amount of the hot melt adhesive buffer layer is 120 g / m 2 .

[0070] Comparative Example 5

[0071] A crack repair cloth, different from that in Example 1 in that: in Comparative Example 5, the coating amount of the hot melt adhesive buffer layer is 180 g / m 2 .

[0072] Performance detection test

[0073] Detection method

[0074] Experiment 1: Detection of the physical properties of the crack resistance layer

[0075] The crack repair cloths of Examples 1-3 and Comparative Examples 1-5 were respectively subjected to physical property tests. The physical property test items are shown in Table 1 below, and the test results are shown in Table 2 below.

[0076]

[0077]

[0078] Table 1. Physical property test items of the crack repair cloth

[0079]

[0080] Table 2. Physical property test results of the crack repair cloth

[0081] According to the physical property test results of Examples 1-3 and Comparative Examples 1-5, it can be seen that the comprehensive physical properties of the crack repair cloths in Examples 1-3 using polyester full-lined elastic cloth, polyester-cotton cloth and hot-melt adhesive buffer layer are the best, and all can meet the required anti-crack technical requirements for crack repair.

[0082] Experiment 2: Testing of putty appearance and powdering

[0083] Use a cutting saw to cut 15-mm-thick fiber-reinforced cement boards into multiple 10 cm×10 cm test blocks, bond the crack repair cloths of Examples 1-3 and Comparative Examples 1-5 on each test block respectively, and apply putty on the crack repair cloths (plastic cloth layers) of Examples 1-3 and Comparative Examples 1-5. The putty used is commercially available interior putty, and the production of the test samples of Examples 1-3 and Comparative Examples 1-5 is completed.

[0084] After the putty dries, observe whether there are apparent defects such as cracks on the surface layer of the putty, touch the surface layer of the prepared putty with your hand, and observe the powder sticking situation on your hand. The more obvious the powder sticking phenomenon on the hand indicates the more serious the powdering phenomenon of the putty and the more obvious the powdering phenomenon, indicating insufficient structural strength of the putty.

[0085] The test results are shown in Table 3 below

[0086] apparent state chalking phenomenon Example 1 The surface is flat, compact, and free of cracks No powder shedding Example 2 The surface is flat, compact, and free of cracks No powder shedding Example 3 The surface is flat, compact, and free of cracks No powder shedding Comparative Example 1 The surface is flat, compact, and free of cracks No powder shedding Comparative Example 2 The surface is flat, compact, and free of cracks No powder shedding Comparative Example 3 Cracks appear on the surface after drying Obvious powder shedding Comparative Example 4 The surface is flat, compact, and free of cracks No powder shedding Comparative Example 5 The surface is flat, compact, and free of cracks No powder shedding

[0087] Table 3. Test results of appearance and powdering

[0088] According to the comparison of the appearance and powdering results of Examples 1-3 and Comparative Examples 1-5, it can be seen that when the putty is coated on the plastic cloth layer of the crack repair cloth, the putty coating effects on Examples 1-3, Comparative Examples 1-2, and Comparative Examples 4-5 with the obvious plastic cloth layer being polyester-cotton cloth are good, while the putty coating effect of Comparative Example 3 with the plastic cloth layer being cotton cloth becomes significantly worse. The main reason is that cotton cloth has excellent water absorption compared to polyester-cotton cloth, which easily causes the putty coated on it to dry too quickly and unevenly, thus affecting the putty coating effect.

[0089] Example 4

[0090] A preparation device for a crack repair cloth, used for the tension-free compounding between a plastic cloth layer and an elastic cloth layer. It should be noted that the so-called tension-free compounding does not mean that the tension is 0, but a compounding form with reduced tension.

[0091] Reference Figure 2, a preparation device for a crack repair cloth, comprising a frame 7, on which a plastic cloth unwinding roller 9, a winding roller 14, a first servo motor for driving the plastic cloth unwinding roller 9 to rotate, and a second servo motor for driving the winding roller 14 to rotate are installed. A plastic cloth roll is fixedly installed on the roller shaft of the plastic cloth unwinding roller 9. Pull the free end of the plastic cloth of the plastic cloth roll, and fix the free end of the plastic cloth on the winding roller 14.

[0092] Reference Figure 2 , on the frame 7, an elastic cloth unwinding roller 8, a guide roller group, and a third servo motor for driving the elastic cloth unwinding roller 8 to rotate are installed. An elastic cloth roll is fixedly installed on the roller shaft of the elastic cloth unwinding roller 8. Pull the free end of the elastic cloth of the elastic cloth roll, so that after the elastic cloth bypasses the guide roller group, fix the free end of the elastic cloth on the winding roller 14. Among them, the elastic cloth will be attached to the plastic cloth under the traction of the guide roller group, and the free end of the elastic cloth on the winding roller 14 is also attached to the free end of the plastic cloth.

[0093] Control the working modes of the first servo motor, the second servo motor, and the third servo motor to be the same, so that the rotations of the plastic cloth unwinding roller 9, the elastic cloth unwinding roller 8, and the winding roller 14 are synchronized. Based on the rotational synchronization, the synchronization rate of the unwinding and winding of the elastic cloth is high, which can reduce the tension acting on the elastic cloth during unwinding and winding, and reduce the loss of elastic performance of the elastic cloth during the transmission process.

[0094] Reference Figure 2 , a coating assembly 10 is also installed on the frame 7. The coating end of the coating assembly 10 faces the surface of the plastic cloth for attaching to the elastic cloth, and the coating assembly coats the plastic cloth with composite glue before the elastic cloth and the plastic cloth are attached.

[0095] Reference Figure 2 , a pressing roller assembly 13 is also installed on the frame 7. The pressing roller assembly includes an upper pressing roller 131 and a lower pressing roller 132. A pressing gap is formed between the upper pressing roller 131 and the lower pressing roller 132. The elastic cloth output from the guide roller group and the plastic cloth coated with composite glue are attached and then pass through the pressing gap and are wound by the winding roller 14. The distance of the pressing gap is smaller than the thickness after the elastic cloth and the plastic cloth are attached. The upper pressing roller 131 and the lower pressing roller 132 will apply pressure to attach the elastic cloth and the plastic cloth to improve the bonding strength between the plastic cloth and the elastic cloth.

[0096] In addition, reference Figure 2, Specifically, the guiding roller group includes two guiding rollers 11. Both of the two guiding rollers 11 are located on the unwinding side of the elastic cloth unwinding roller 8. The two guiding rollers 11 are arranged in sequence along the length direction of the elastic cloth. The two guiding rollers 11 gradually descend along the length direction of the elastic cloth perpendicular to the height of the plastic cloth. The two guiding rollers 11 are respectively arranged on both sides of the elastic cloth, and the roller surfaces of the guiding rollers 11 all face the elastic cloth. Through the alternating traction of the two guiding rollers 11 with a height difference, the elastic cloth output by the elastic cloth unwinding roller 8 can be attached to the plastic cloth.

[0097] Reference Figure 3 and Figure 4 , The axial direction of the guiding roller 11 extends along the width direction of the elastic cloth. Mounting plates 111 are respectively arranged on the side walls on both sides of the axial direction of the guiding roller 11. The guiding roller 11 can be mounted on the frame 7 through the mounting plates 111 and fasteners. The fasteners can be screw and nut fasteners, etc. The guiding roller 11 has a semi-circular roller surface. A ventilation groove 113 is axially opened along the upper part of the guiding roller 11. The ventilation groove 113 is located at the central axis position of the guiding roller 11. A plurality of air outlets 114 are opened on the guiding roller 11. The air outlets 114 are evenly distributed on the arc-shaped roller surface. An arc-shaped connecting groove 115 is opened at the position between the ventilation groove 113 and the air outlets 114 on the guiding roller 11. The air outlets 114 are communicated with the arc-shaped connecting groove 115; A communicating groove 116 is opened at the position between the ventilation groove 113 and the arc-shaped connecting groove 115 on the guiding roller 11. The notch of the communicating groove 116 gradually expands in the direction extending from the ventilation groove 113 to the arc-shaped connecting groove 115. The communicating groove 116 communicates the ventilation groove 113 and the arc-shaped connecting groove 115; A guiding air inlet connecting pipe 112 is arranged on the side wall of the axial direction of the guiding roller 11. The guiding air inlet connecting pipe 112 is communicated with the ventilation groove 113. The guiding air inlet connecting pipe 112 is used to be connected with an external air source so that gas can flow inside the guiding roller 11.

[0098] The gas introduced by the guiding air inlet connecting pipe 112 is output in sequence through the ventilation groove 113, the communicating groove 116, the arc-shaped connecting groove 115 and the air outlets 114. The gas output by the air outlets 114 forms a traction gas layer on the roller surface of the guiding roller 11. The traction gas layer can reduce the frictional force generated between the elastic cloth and the guiding roller during the guiding process, thereby reducing the problem of increased tension caused by the frictional force, reducing the loss of elastic performance of the elastic cloth caused by the increased tension, and thus improving the crack repair anti-cracking effect of the crack repair cloth. Moreover, on the gas flow path inside the guiding roller 11, the gas will gradually be pre-diffused and dispersed under the guidance of the communicating groove 115 and the arc-shaped connecting groove 116, and then blown out by the air outlets 114. Compared with the blowing path of the gas directly from the ventilation groove 113 to the air outlets 114, the gas dispersion uniformity is greatly improved, and the gas blown out by the air outlets 114 forms a uniform traction gas layer on the roller surface of the guiding roller, improving the traction effect of the guiding roller 11 on the elastic cloth.

[0099] In the embodiment of the present application, the guide roller 11 adopts a fixedly installed semi-circular roller structure. In other embodiments, the guide roller 11 can also adopt a full-circular roller structure. The guide roller 11 with a full-circular roller structure can be rotatably connected to the frame 7. In addition to the traction air layer formed by the air outlet 114, the rotating guide roller 11 can provide a conveying force for the elastic cloth located on the traction air layer to assist in the conveyance of the elastic cloth. The central axis of the air outlet 114 is tangent to the roller surface of the guide roller 11, which can improve the conveying efficiency.

[0100] Reference Figure 2 , in order to improve the flatness of the fit between the elastic cloth and the plastic cloth, a scraper assembly 12 is also provided at the position between the discharge side of the guide roller 11 and the pressure roller assembly 13. The scraper assembly 12 is used to level the elastic cloth output by the guide roller 11 and the plastic cloth after coating when they are in contact.

[0101] Reference Figure 2 , the scraper assembly 12 includes an upper scraper 121 and a lower scraper 122. A passing gap for the elastic cloth and the plastic cloth to pass through is formed between the upper scraper 121 and the lower scraper 122; Reference Figure 5 And Figure 6 , it also includes a scraper bracket 123. The upper scraper 121 is installed on the scraper bracket 123, and the upper scraper 121 is installed on the frame 7 through the scraper bracket 123. The length direction of the scraper edge of the upper scraper 121 extends along the width direction of the elastic cloth. The upper scraper 121 is provided with a scraper air cavity 125, a scraper air inlet connecting pipe 124 communicating with the scraper air cavity 125, and a scraper air outlet nozzle communicating with the scraper air cavity 125. The scraper air inlet pipe 124 is used to connect to an external air source. The gas introduced through the scraper air inlet pipe 124 passes through the scraper air cavity 125 and is then output by the scraper air outlet nozzle. The air outlet direction of the scraper air outlet nozzle of the upper scraper 121 is opposite to the conveying direction of the elastic cloth, so that the gas forms an air plate on the scraper edge of the upper scraper 121 for pushing the elastic cloth. The elastic cloth is "leveled" through the air plate. The air pressure of the air plate can effectively level the elastic cloth. The gas penetrates through the cloth surface of the elastic cloth, which will drive the gas existing between the elastic cloth and the plastic cloth to flow away from the pressure roller assembly, reducing the problem of bubbles that are likely to exist when the elastic cloth and the plastic cloth are pressed and fitted. At the same time, the air plate is a non-direct physical contact type of leveling, which can reduce the contact pulling of the elastic cloth, reduce the frictional effect, and reduce the tension force on the elastic cloth.

[0102] Reference Figure 5 And Figure 6, the width of the upper scraper 121 gradually increases in the direction from the scraper air inlet connection pipe 124 to the scraper air outlet nozzle, and the ventilation gap of the scraper air cavity 125 in the direction from the scraper air inlet connection pipe 124 to the scraper air outlet nozzle gradually decreases along the air outlet direction. Based on this structural design, the gas input by the scraper air inlet connection pipe 124 can gradually increase the air outlet pressure under the guidance of the scraper air cavity 125, increase the air pressure intensity blown out by the scraper air outlet nozzle, and improve the leveling effect of the upper scraper 121.

[0103] The structure of the lower scraper 122 is the same as that of the upper scraper 121.

[0104] The above are all preferred embodiments of this application. The protection scope of this application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.

Claims

1. A crack repair cloth, characterized in that: It includes a plastic cloth layer (1) and an elastic cloth layer (2). The plastic cloth layer (1) is a polyester-cotton cloth, which is a polyester-cotton blended fabric. The polyester-cotton cloth is a textile woven from a blended yarn of 65%-67% polyester and 33%-35% cotton. The elastic cloth layer (2) is a polyester full-lining stretch fabric, that is, a polyester stretch fabric. The plastic cloth layer (1) and the elastic cloth layer (2) are connected through a composite adhesive layer (3). The coating amount of the composite adhesive layer (3) is 110 g / m 2 -120 g / m 2 , and a hot-melt adhesive buffer layer (4) is provided on the side of the elastic cloth layer (2) away from the plastic cloth layer (1). The coating amount of the hot-melt adhesive buffer layer (4) is 140 g / m 2 -160 g / m 2 .

2. The crack repair cloth according to claim 1, characterized in that: A peelable layer (5) is provided on the side of the hot melt adhesive buffer layer (4) away from the elastic cloth layer.

3. The crack repair cloth according to claim 1, characterized in that: The crack repair cloth is also provided with exhaust holes (6), and the exhaust holes (6) penetrate through the plastic cloth layer (1), the composite adhesive layer (3), the elastic cloth layer (2) and the hot melt adhesive buffer layer (4) at one time.

4. A preparation device for the crack repair cloth according to any one of claims 1-3, characterized in that, Comprising: A plastic cloth unwinding roller (9); A coating assembly (10), the coating assembly (10) is located on the unwinding side of the plastic cloth unwinding roller (9), and the coating assembly (10) is used for coating the plastic cloth; A pressing roller assembly (13), the pressing roller assembly (13) is located on the side of the coating assembly (10) away from the plastic cloth unwinding roller (9); A winding roller (14), the winding roller (14) is located on the side of the pressing roller assembly (13) away from the coating assembly (10); An elastic cloth unwinding roller (8); A guiding roller group, the guiding roller group is located on the unwinding side of the elastic cloth unwinding roller, the guiding roller group is used for pulling the elastic cloth, and the discharging side of the guiding roller group is located between the coating assembly and the pressing roller assembly. The elastic cloth pulled by the guiding roller group is attached to the coating surface of the plastic cloth; the guiding roller group includes a guiding roller (11), and the guiding roller (11) is provided with a guiding air inlet connecting pipe (112), a ventilation groove (113) communicated with the guiding air inlet connecting pipe, and an air outlet (114) communicated with the ventilation groove. The air outlet (114) faces the elastic cloth; The plastic cloth unwinding roller (9), the elastic cloth unwinding roller (8) and the winding roller (14) rotate synchronously; It further includes a scraping plate assembly (12), and the scraping plate assembly (12) is located between the discharging side of the guiding roller group and the feeding side of the pressing roller assembly (13); The scraping plate assembly (12) includes an upper scraping plate (121) and a lower scraping plate (122), and a passing gap for the elastic cloth and the plastic cloth to pass through is formed between the upper scraping plate (121) and the lower scraping plate (122); the upper scraping plate (121) is provided with a scraping plate air cavity (125), a scraping plate air inlet connecting pipe (124) communicated with the scraping plate air cavity, and a scraping plate air outlet nozzle communicated with the scraping plate air cavity. The scraping plate air outlet nozzle of the upper scraping plate (121) faces the elastic cloth, and the air outlet direction of the scraping plate air outlet nozzle of the upper scraping plate (121) is opposite to the conveying direction of the elastic cloth; the structure of the lower scraping plate (122) is the same as that of the upper scraping plate, the scraping plate air outlet nozzle of the lower scraping plate (122) faces the plastic cloth, and the air outlet direction of the scraping plate air outlet nozzle of the lower scraping plate (122) is opposite to the conveying direction of the plastic cloth; The inner diameter of the scraping plate air cavity (125) gradually decreases along the air outlet direction.

5. The preparation device of the crack repair cloth according to claim 4, characterized in that: The ventilation groove (113) extends along the axial direction of the guiding roller (11), the air outlets (114) are evenly distributed on the roller surface of the guiding roller (11), and an arc-shaped connecting groove (115) is formed between the air outlets (114) and the ventilation groove (113). Each air outlet (114) and the ventilation groove (113) are communicated through the arc-shaped connecting groove (115).

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