Preparation method of household paper with microcapsules

Abstract

The embodiment of the invention provides a preparation method of household paper with microcapsules. The preparation method comprises the following steps: S1, providing a microcapsule emulsion and a base material; s2, an embossing roller set is provided and comprises an embossing roller and a bottom roller which are oppositely arranged, a tooth-shaped body is arranged on the roller face of the embossing roller, and the tooth-shaped body comprises a top face and a tooth side face; s3, microcapsule emulsion is sprayed in the roller surface direction of the embossing roller; s4, removing the microcapsule emulsion covering the top surface of the tooth-shaped body; s5, the base material is embossed through the embossing roller set, in this way, the microcapsule emulsion is only arranged on the groove side faces in the indentations, on one hand, the microcapsules on the bottom face are prevented from being broken, on the other hand, the situation that the microcapsules are broken due to the fact that the groove side faces are subjected to large pressure in the indentation forming process is avoided, and on the third hand, the microcapsules on the bottom face are not damaged. Due to the fact that the microcapsule emulsion is located on the side face of the groove, a certain elastic space is formed by the indentations in the follow-up operation process, the microcapsules located on the side face of the groove cannot be directly stressed, and therefore the situation that the microcapsules are broken is greatly reduced.

Description

Technical Field

[0001] The invention relates to a method for preparing household paper with microcapsules. Background Art

[0002] With the improvement of living standards, people have higher and higher requirements for thin household paper. In order to meet the various needs of consumers, paper manufacturers have spared no effort to make paper have different use effects through various methods. Among them, setting microcapsules with different functions on the paper surface is an effective method, as shown in CN102525861A, CN202401342U, CN202620271U, CN102321995A, CN102704340A, CN102808361A, JP2006122672A, JP5806060A and other documents.

[0003] However, when adding microcapsules to the paper surface, there is always a problem that the microcapsule breakage rate cannot be effectively controlled during production. More specifically, after adding microcapsules to the paper surface, people hope that during use, such as wiping, the wall material will break and release the functional components of the core material. Under this requirement, the wall material cannot have high compression resistance or tear resistance. However, during the production process, the paper will be subjected to different degrees of pressure, especially in the embossing process, edge lamination process, slitting process, winding process, etc. When the wall material does not have high compression resistance or tear resistance, these wall materials will be damaged during the production process and release the functional components of the core material, thereby resulting in the loss of the value of using microcapsule technology. On the other hand, after improving the compression resistance or tear resistance of the wall material, the core material is difficult to release during use, which also results in the loss of the value of using microcapsule technology. Therefore, based on the above reasons, microcapsule technology or household paper with microcapsules has not been widely used.

[0004] Therefore, it is necessary to develop a new technical solution to solve the above technical problems. Summary of the invention

[0005] To this end, the present invention provides a method for preparing household paper with microcapsules to solve the above technical problems.

[0006] A method for preparing microcapsule-containing tissue paper comprises the following steps: S1: Provide microcapsule emulsion and substrate; S2: providing an embossing roller set, which comprises an embossing roller and a bottom roller arranged opposite to each other, wherein a gap is provided between the embossing roller and the bottom roller for the substrate to pass through, wherein a tooth-shaped body is provided on the roller surface of the embossing roller, wherein the tooth-shaped body is used to form an indentation on the substrate when the substrate passes through, wherein the tooth-shaped body comprises a top surface and a tooth side surface, and wherein the indentation comprises a bottom surface corresponding to the top surface and a groove side surface corresponding to the tooth side surface; S3: Spraying the microcapsule emulsion toward the roller surface of the embossing roller, wherein the microcapsule emulsion adheres to the top surface and the tooth side surface of the tooth-shaped body; S4: removal of the microcapsule emulsion covering the top surface of the denticle; S5: embossing the substrate using the embossing roller group, so that the teeth of the embossing roller form indentations on the substrate and transfer the microcapsule emulsion attached to the side surfaces of the teeth to the groove sides of the formed indentations.

[0007] Among them, in step S4, the microcapsule emulsion covering the top surface of the toothed body is removed by a removal device, and the removal device includes a felt body, and the felt body includes a fixed end and a free end extending toward the embossing roller, and an attachment surface facing the embossing roller is included between the fixed end and the free end, and the attachment surface is kept in an attached state with the top surface of the toothed body.

[0008] Wherein, the free end droops naturally under the action of gravity.

[0009] Wherein, the free end is fixed, and the felt body between the free end and the fixed end protrudes in an arc shape toward the embossing roller to form an arc-shaped protrusion, and the arc-shaped protrusion is attached to the top surface of the toothed body.

[0010] Among them, the bottom roller includes a base part and a covering layer coated on the base part, the covering layer is wool felt, the base part also includes a side wall and a cavity surrounded by the side wall, the side wall is provided with a plurality of adsorption holes penetrating the thickness direction of the side wall, one end of the adsorption hole faces the covering layer, and the other end is connected to the cavity, and the cavity is in a negative pressure state.

[0011] Wherein, the tooth side surface is a rough surface, and a recessed portion is formed on the rough surface.

[0012] Wherein, the toothed body further includes an inclined surface inclined to the top surface, and an angle between the inclined surface and the top surface is 115° to 150°.

[0013] Wherein, the inclined surface is a plane.

[0014] Wherein, the inclined surface is located in the downstream direction of the rotation direction of the embossing roller, and the inclined surface is a rough surface or a concave portion is arranged on the inclined surface.

[0015] Wherein, the inclined surface cuts off a part of the top surface, and the area ratio of the cut-off top surface part to the retained top surface part is 1:4 to 1:1.

[0016] Beneficial effect: The embodiment of the present invention provides a method for preparing household paper with microcapsules. S1: providing a microcapsule emulsion and a substrate; S2: providing an embossing roller group, which includes an embossing roller and a bottom roller arranged opposite to each other, the roller surface of the embossing roller is provided with a toothed body, the toothed body is used to form an indentation on the substrate, the toothed body includes a top surface and a toothed side surface, and the indentation includes a bottom surface corresponding to the top surface and a groove side surface corresponding to the toothed side surface; S3: spraying the microcapsule emulsion in the direction of the roller surface of the embossing roller; S4: removing the microcapsule emulsion covered by the top surface of the toothed body; S5: embossing the substrate with the embossing roller group, and the microcapsule emulsion is only set on the groove side surface in the indentation in the above manner, on the one hand, preventing the microcapsules on the bottom surface from rupturing, on the other hand, the groove side surface will not be subjected to a large pressure in the process of forming the indentation, causing the microcapsules to rupture. Thirdly, since the microcapsule emulsion is located on the groove side surface, in the subsequent operation process, the indentation itself forms a certain elastic space, so that the microcapsules located on the groove side surface will not be directly subjected to force, thereby greatly reducing the rupture of the microcapsules. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of a device for forming tissue paper with microcapsules; Figure 2 A schematic cross-sectional view of a household paper with microcapsules formed in an embodiment of the present application; Figure 3 Schematic diagram of the dentate body; Figure 4 for Figure 3 Schematic diagram of the AA section; Figure 5 A schematic diagram of a device for forming household paper with microcapsules in another embodiment; Component Description: Substrate 10; indentation 11; groove side 111; bottom surface 112; embossing roller group 20; embossing roller 21; toothed body 211; top surface 2111; tooth side surface 2112; inclined surface 2113; recessed portion 2114; bottom roller 22; base portion 221; adsorption hole 2211; cavity 2212; coating layer 222; nozzle 30; microcapsule emulsion 300; emulsion layer 301; removal device 40; felt body 41; fixed end 411; free end 412; attachment surface 413; arc-shaped protrusion 414; fixing frame 42; receiving groove 43. DETAILED DESCRIPTION

[0018] The embodiment of the present invention provides a method for preparing household paper with microcapsules, and the present application is further described below.

[0019] S1: providing a microcapsule emulsion 300 and a substrate 10.

[0020] The microcapsule emulsion 300 comprises microcapsules and emulsion, wherein the microcapsules are mixed in the emulsion, and the emulsion contains 3% to 25% of emulsifier and deionized water.

[0021] Further, it can be understood that the microcapsules are in granular form, and the microcapsule solution also includes a dispersion stabilizer, which is dispersed between the microcapsule particles so that the microcapsule particles are evenly and stably distributed in the microcapsule emulsion 300. Specifically, the dispersion stabilizer can include a dispersant, and the dispersant can be one of a cellulose derivative, a lignin sulfonate, a polyacrylic acid derivative, a polycarboxylic acid polyester of a low or high molecular weight unsaturated acid, a polycarboxylic acid, a salt of a long-chain polyamine amide, and an alkanolammonium salt of a block copolymer having an acidic group.

[0022] The microcapsule comprises a wall material and a core material, wherein the wall material is sodium alginate, gelatin or gum arabic, and the core material can be a skin care agent, a cleaning agent, an antibacterial agent, a moisturizing agent, an antioxidant or a fragrance.

[0023] Specifically, the skin care agent can be selected from at least one of vitamin C, vitamin E, beeswax, collagen, honeysuckle extract, coix seed extract, lemon extract, cucumber extract, witch hazel extract, chamomile extract, and aloe extract.

[0024] The cleaning agent can be selected from alkyl aryl sulfonates, secondary alkyl fatty hydrocarbon sulfonates, alkyl sulfates, sodium lauryl alcohol polyoxyethylene ether sulfate, sodium lauryl sulfate, aminopropionates, iminopropionates, polyoxyethylene ethers, alkyl glycosides and their derivatives, fatty alcohol polyoxyethylene ethers, alcohol amides, etc.

[0025] The moisturizing agent can be selected from polyols such as glycerol, diglycerol, polyethylene glycol, propylene glycol, hexylene glycol, polypropylene glycol, etc.; sugars such as sorbitol, glucose, xylitol, maltitol, mannitol, etc.

[0026] The antibacterial agent is preferably a natural antibacterial agent, which can be seaweed extract, aloe extract, amino acid, sodium lactate, urea, hyaluronic acid, sodium pyrrolidonecarboxylate, ceramide, collagen, chitosan derivatives, mucopolysaccharides, chondroitin sulfate, lactic acid and its salts (such as sodium lactate), corn steep liquor, hydrolyzate of hydrolyzed starch, urea, triglyceride, palmitic acid, myristic acid, stearic acid, silicone, sodium pyrrolidonecarboxylate, etc.

[0027] The antioxidant may be curcumin.

[0028] In this embodiment, the substrate 10 is a thin sheet of paper made from wood pulp fibers by wet papermaking. It is understandable that the substrate 10 can also be a thin sheet of paper made from mixed fibers of wood pulp and non-wood pulp (cotton fiber or chemical fiber) by wet papermaking. In other embodiments, the substrate 10 can also be a thin sheet material such as non-woven fabric, dust-free paper, etc.

[0029] S2: Provide an embossing roller 21 group 20, which includes an embossing roller 21 and a bottom roller 22 arranged opposite to each other, wherein a gap is provided between the embossing roller 21 and the bottom roller 22 for the substrate 10 to pass through, and the roller surface of the embossing roller 21 is provided with a toothed body 211, and the toothed body 211 is used to form an indentation 11 on the substrate 10 when the substrate 10 passes through, and the toothed body 211 includes a top surface 2111 and a tooth side surface 2112, and the indentation 11 includes a bottom surface 112 corresponding to the top surface 2111 and a groove side surface 111 corresponding to the tooth side surface 2112.

[0030] Please refer to Figure 1 In this embodiment, the bottom roller 22 includes a base portion 221 and a coating layer 222 coated on the base portion 221. The coating layer 222 is an elastomer, so that when the toothed body 211 applies pressure to the substrate 10, the coating layer 222 is recessed at a corresponding position so that the substrate 10 is recessed toward the elastomer to form an indentation 11 and a bulge is formed in the direction toward the elastomer. This embossing form is also called point-to-concave.

[0031] Furthermore, the coating layer 222 is wool felt.

[0032] In other embodiments, the surface of the bottom roller 22 may also be a rigid plane or configured to have a concave shape at a position corresponding to the toothed body 211 .

[0033] In addition, adjustment mechanisms may be provided at both ends of the embossing roller 21 and the bottom roller 22 to adjust the gap between the embossing roller 21 and the bottom roller 22, thereby adjusting the embossing depth of the substrate 10 and adjusting the embossing effect.

[0034] S3: Spraying the microcapsule emulsion 300 toward the roller surface of the embossing roller 21 , and the microcapsule emulsion 300 adheres to the top surface 2111 and the tooth side surface 2112 of the toothed body 211 .

[0035] In this embodiment, the microcapsule emulsion 300 is sprayed onto the roller surface through a nozzle 30 facing the roller surface of the embossing roller 21 . It can be understood that the microcapsule emulsion 300 will adhere to the top surface 2111 and the tooth side surface 2112 of the tooth body 211 .

[0036] S4: removing the microcapsule emulsion 300 covering the top surface 2111 of the serration 211 .

[0037] In this embodiment, the microcapsule emulsion 300 covering the top surface 2111 of the serration 211 is removed by a removal device 40. After the microcapsule emulsion 300 covering the top surface 2111 is removed, the microcapsule emulsion 300 attached to the tooth side surface 2112 of the serration 211 will be retained, so that only the microcapsule emulsion 300 on the tooth side surface 2112 is transferred into the indentation 11.

[0038] Specifically, the removal device 40 includes a felt body 41 and a fixing frame 42 for fixing the felt body 41, the felt body 41 includes a fixed end 411 fixed on the fixing frame 42 and a free end 412 extending toward the embossing roller 21, and includes an attachment surface 413 facing the embossing roller 21 between the fixed end 411 and the free end 412. It can be understood that the attachment surface 413 maintains an attachment state with the top surface 2111 of the toothed body 211. In this state, when the embossing roller 21 rotates, the microcapsule emulsion 300 covering the top surface 2111 of the toothed body 211 will be scraped off by the felt body 41, and because the felt body 41 is only attached to the top surface 2111 of the toothed body 211, the felt body 41 only scrapes off the microcapsule emulsion 300 on the top surface 2111 of the toothed body 211 but does not scrape off the microcapsule emulsion 300 on the tooth side surface 2112, thereby retaining the microcapsule emulsion 300 on the tooth side surface 2112.

[0039] Furthermore, the free end 412 naturally droops under the action of gravity, so that the felt body 41 remains attached to the tooth top surface 2111 .

[0040] For further information, please refer to Figure 5 In another embodiment, the free end is fixed, and the felt body between the free end and the fixed end protrudes in an arc shape toward the embossing roller to form an arc-shaped protrusion 414, and the arc-shaped protrusion 414 is attached to the top surface of the toothed body. In this form, the arc-shaped protrusion 414 can maintain attachment to the top surface of the toothed body more stably, and reduce the embossing roller during the rotation process. The movement of the toothed body causes the felt body to form a slapping effect, which in turn causes the microcapsule emulsion on the tooth side to detach or become uneven.

[0041] Furthermore, a receiving groove 43 is provided at the lower side of the felt body 41 for receiving the microcapsule emulsion 300 scraped off from the felt body 41 .

[0042] S5: The substrate 10 is embossed using the embossing roller group 21 20 so that the teeth 211 of the embossing roller 21 form an indentation 11 on the substrate 10 and transfer the microcapsule emulsion 300 attached to the tooth side surface 2112 to the groove side surface 111 of the formed indentation 11 at the same time.

[0043] Please refer to Figure 2 The formed indentation 11 includes a bottom surface 112 and a groove side surface 111 , wherein the bottom surface 112 corresponds to the top surface 2111 , so that no microcapsule emulsion 300 will remain on the bottom surface 112 , and an emulsion layer 301 is formed on the groove side surface 111 .

[0044] It can be understood that by this method, the emulsion layer 301 is maintained on the groove side 111. On the one hand, during the process of forming the indentation 11, there is no microcapsule emulsion 300 on the bottom surface 112 where the pressure is the greatest, thereby preventing the microcapsules in this area from rupturing. On the other hand, the emulsion layer 301 located on the groove side 111 is actually formed by the groove side 111 scraping the tooth side 2112 during the process of forming the indentation 11, that is, during the process of forming the indentation 11, the groove side 111 will not be subjected to a large pressure to cause the microcapsules to rupture. Thirdly, since the microcapsule emulsion 300 is located on the groove side 111, in subsequent operations, such as slitting, curling, folding, etc., the indentation 11 itself forms a certain elastic space, so that the microcapsules located on the groove side 111 will not be directly subjected to force, thereby greatly reducing the rupture of the microcapsules. In a specific test, compared with the coating method, the microcapsule rupture rate is reduced by more than 85%.

[0045] Furthermore, the base portion 221 also includes a side wall and a cavity 2212 surrounded by the side wall. The side wall is provided with a plurality of adsorption holes 2211 that pass through the thickness direction of the side wall. One end of the adsorption hole 2211 faces the coating layer 222, and the other end is connected to the cavity 2212. The cavity 2212 is in a negative pressure state, so that when the indentation 11 is formed, the microcapsule emulsion 300 located on the tooth side surface 2112 is transferred to the groove side surface 111 under the adsorption action to form an emulsion layer 301.

[0046] It can be understood that the cavity 2212 is connected to a negative pressure device so as to form a negative pressure in the cavity 2212 .

[0047] For further information, please refer to Figure 3 and Figure 4 In order to make the tooth side surface 2112 cover the microcapsule emulsion 300 more stably, the tooth side surface 2112 can also be set to a rough surface, and a recessed portion 2114 is formed on the rough surface. When the microcapsule emulsion 300 is sprayed onto the tooth body 211, the recessed portion 2114 can accommodate or allow the microcapsule emulsion 300 to adhere to the tooth side surface 2112 more and more stably under the action of surface tension.

[0048] Furthermore, the toothed body 211 also includes an inclined surface 2113 inclined to the top surface 2111, and the angle between the inclined surface 2113 and the top surface 2111 is 115° to 150°, and more preferably, the angle is 125° to 140°. At the same time, the inclined surface 2113 is located in the downstream direction of the rotation direction of the embossing roller 21, and the inclined surface 2113 is a rough surface or a recessed portion 2114 is provided on the inclined surface 2113. It is found that when the inclined surface 2113 is provided downstream of the rotation direction of the embossing roller 21, during the process of embossing to form the indentation 11, the area where the inclined surface 2113 is located will be subjected to less pressure, thereby further reducing the rupture rate of the microcapsules.

[0049] It can be understood that after the inclined surface 2113 is provided, a portion of the top surface 2111 is cut off, and the area ratio of the cut-off portion of the top surface 2111 to the retained portion of the top surface 2111 is 1:4 to 1:1. It can be understood that the inclined surface 2113 is a plane.

[0050] The above description is only an implementation mode of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the present invention specification, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A method for preparing household paper with microcapsules, characterized in that: The steps include: S1: Provide microcapsule emulsion and substrate; S2: providing an embossing roller set, which comprises an embossing roller and a bottom roller arranged opposite to each other, wherein a gap is provided between the embossing roller and the bottom roller for the substrate to pass through, wherein a tooth-shaped body is provided on the roller surface of the embossing roller, wherein the tooth-shaped body is used to form an indentation on the substrate when the substrate passes through, wherein the tooth-shaped body comprises a top surface and a tooth side surface, and wherein the indentation comprises a bottom surface corresponding to the top surface and a groove side surface corresponding to the tooth side surface; S3: Spraying the microcapsule emulsion toward the roller surface of the embossing roller, wherein the microcapsule emulsion adheres to the top surface and the tooth side surface of the tooth-shaped body; S4: removal of the microcapsule emulsion covering the top surface of the denticle; S5: embossing the substrate using the embossing roller group, so that the teeth of the embossing roller form indentations on the substrate and transfer the microcapsule emulsion attached to the side surfaces of the teeth to the groove sides of the formed indentations.

2. The preparation method according to claim 1, characterized in that In step S4, the microcapsule emulsion covering the top surface of the toothed body is removed by a removal device, wherein the removal device comprises a felt body, wherein the felt body comprises a fixed end and a free end extending toward the embossing roller, and an attachment surface facing the embossing roller is included between the fixed end and the free end, and the attachment surface is kept in an attached state with the top surface of the toothed body.

3. The preparation method according to claim 2, characterized in that: The free end droops naturally under the action of gravity.

4. The preparation method according to claim 2, characterized in that: The free end is fixed, and the felt body between the free end and the fixed end protrudes in an arc shape toward the embossing roller to form an arc-shaped protrusion, and the arc-shaped protrusion is attached to the top surface of the toothed body.

5. The preparation method according to claim 2, characterized in that: The bottom roller includes a base portion and a covering layer coated on the base portion, the covering layer is wool felt, the base portion also includes a side wall and a cavity surrounded by the side wall, the side wall is provided with a plurality of adsorption holes penetrating the thickness direction of the side wall, one end of the adsorption hole faces the covering layer, and the other end is connected to the cavity, and the cavity is in a negative pressure state.

6. The preparation method according to claim 5, characterized in that: The tooth side surface is a rough surface, and a recessed portion is formed on the rough surface.

7. The preparation method according to claim 5, characterized in that: The toothed body further comprises an inclined surface inclined to the top surface, and an angle between the inclined surface and the top surface is 115° to 150°.

8. The preparation method according to claim 7, characterized in that: The inclined surface is a plane.

9. The preparation method according to claim 7, characterized in that: The inclined surface is located in the downstream direction of the rotation direction of the embossing roller, and the inclined surface is a rough surface or a concave portion is arranged on the inclined surface.

10. The preparation method according to claim 7, characterized in that: The inclined surface cuts off a portion of the top surface, and the area ratio of the cut-off top surface portion to the retained top surface portion is 1:4 to 1:1.

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