A non-curling reinforced kraft paper tape

Abstract

The utility model discloses a non-curling ribbed kraft paper tape, the kraft paper tape comprises a composite substrate layer and an adhesive layer, the composite substrate layer and the adhesive layer are composited together, the composite substrate layer comprises kraft paper, an adhesive and reinforcing ribs, the kraft paper comprises a surface layer kraft paper and a bottom layer kraft paper, the reinforcing ribs are arranged between the surface layer kraft paper and the bottom layer kraft paper, the surface layer kraft paper and the bottom layer kraft paper are bonded together by an adhesive, and the adhesive layer and the bottom layer kraft paper are composited together. The utility model changes the water content of the paper on both sides of the tape and combines a special structural design, so that the kraft paper has a certain humidity on the adhesive surface in a dry environment, reduces the shrinkage of the paper, and keeps the stress on both sides of the paper consistent to achieve the effect of non-curling.

Description

Technical Field

[0001] The utility model discloses an adhesive tape, in particular to a non-curling reinforced kraft paper adhesive tape, belonging to the technical field of sealing tapes. Background Art

[0002] Kraft paper tape is used for sealing cars and has the property of being easy to degrade, especially starch glue type kraft paper tape, which has better degradation performance. With the restrictions on environmental protection and plastic ban, kraft paper tape is gradually replacing some petroleum-based (BOPP) sealing tapes.

[0003] In order to achieve a high-strength sealing effect, the kraft paper tape in the prior art usually uses a double layer of kraft paper with reinforcement (yarn) in the middle to increase the tensile strength of the tape, meeting the requirements of heavy-duty sealing. However, there are also shortcomings, that is, the starch glue type kraft paper tape is prone to curling when used in a dry environment.

[0004] The curling is caused by the characteristics of paper. Kraft paper tape will expand when it absorbs water and shrink when it dries. In a dry environment, the existing double-layer reinforced kraft paper tape will curl toward the adhesive side because the adhesive side dries (loses water) faster. After curling, the tape is prone to jamming when passing through automatic packaging equipment, causing production inconvenience. Summary of the invention

[0005] In view of the above-mentioned shortcoming that the kraft paper tape in the prior art is prone to curling, the utility model provides a non-curling reinforced kraft paper tape, which adopts a double-layer reinforced kraft paper tape structure and can effectively solve the problem of curling of the adhesive surface.

[0006] The technical solution adopted by the utility model to solve its technical problems is: a non-curling ribbed kraft paper tape, the kraft paper tape comprises a composite substrate layer and an adhesive layer, the composite substrate layer and the adhesive layer are bonded together, the composite substrate layer comprises kraft paper, an adhesive and reinforcing ribs, the kraft paper comprises a surface layer kraft paper and a bottom layer kraft paper, the reinforcing ribs are arranged between the surface layer kraft paper and the bottom layer kraft paper, the surface layer kraft paper and the bottom layer kraft paper are bonded together by an adhesive, and the adhesive layer and the bottom layer kraft paper are bonded together.

[0007] The technical solution adopted by the utility model to solve its technical problems further includes:

[0008] The surface kraft paper and the bottom kraft paper are made of wood pulp paper, and glycerol is absorbed in the surface kraft paper and the bottom kraft paper.

[0009] The adhesive layer is made of starch glue.

[0010] The kraft paper is selected from 35-60g natural color kraft paper.

[0011] The reinforcing ribs are made of yarn.

[0012] The yarn is glass fiber or polyester yarn.

[0013] The yarn thickness is 30-50tex.

[0014] The yarns are arranged in a diamond-shaped or square shape, with a thread spacing of 8 to 15 mm.

[0015] The beneficial effects of the utility model are as follows: the utility model has three obvious characteristics: (1) the tape is environmentally friendly, using wood pulp paper as the main base material, and the adhesive using starch glue, which is environmentally friendly and easy to degrade; (2) the tape has high tensile strength, the tape of the utility model is embedded with yarn, which improves the tensile strength of the tape and can meet the sealing requirements of light and heavy packaging; (3) it is not easy to curl, and the tape remains flat and does not curl in an environment with a humidity of less than 40%. The utility model changes the moisture content of the paper on both sides of the tape and combines a special structural design, so that the kraft paper has a certain humidity on the adhesive surface in a dry environment, reduces paper shrinkage, and keeps the stress on both sides of the paper consistent to achieve the effect of not curling.

[0016] The utility model will be further described below in conjunction with the accompanying drawings and specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the partial cross-section structure of the utility model.

[0018] Figure 2 This is the processing flow chart of the utility model.

[0019] In the figure, 1-composite substrate layer, 11-kraft paper, 111-surface kraft paper, 112-bottom kraft paper, 12-adhesive, 13-reinforcement ribs, 2-adhesive layer. DETAILED DESCRIPTION

[0020] This embodiment is a preferred implementation mode of the utility model. Other embodiments whose principles and basic structures are the same or similar to those of this embodiment are within the protection scope of the utility model.

[0021] Please see attached Figure 1 The utility model mainly protects a non-curling reinforced kraft paper tape, including a composite substrate layer 1 and an adhesive layer 2, wherein the composite substrate layer 1 includes kraft paper 11, an adhesive 12 and a reinforcing rib 13, the kraft paper 11 includes a surface kraft paper 111 and a bottom kraft paper 112, the reinforcing rib 13 is arranged between the surface kraft paper 111 and the bottom kraft paper 112, the surface kraft paper 111 and the bottom kraft paper 112 are bonded together by an adhesive, and the adhesive layer 2 and the bottom kraft paper 112 are composited together.

[0022] In this embodiment, the surface kraft paper 111 and the bottom kraft paper 112 are made of wood pulp paper with good water absorption. In this embodiment, glycerin is absorbed in the surface kraft paper 111 and the bottom kraft paper 112. Since glycerin has a moisturizing effect, the water retention performance of the paper is increased, so that the adhesive surface of the kraft paper can still maintain a certain humidity in a dry environment, reduce paper shrinkage, and enable the adhesive tape to maintain consistent stress on both sides of the paper in an environment with a humidity of less than 40% to achieve flatness without curling.

[0023] In this embodiment, the adhesive layer 2 is made of starch glue, which is environmentally friendly and easily degradable.

[0024] Please refer to the attached Figure 2 The utility model comprises the following steps during production:

[0025] Step 1: Laminating: attaching a layer of polyethylene film to the kraft paper (the surface kraft paper 111 or the bottom kraft paper 112) through a laminating process, so as to act as an adhesive to make the two layers of kraft paper stick together;

[0026] In the specific implementation, 35-60g natural kraft paper is selected. In this embodiment, 37g kraft paper is selected. The polyethylene particles are melted at high temperature and then coated on one side of the kraft paper through a casting die to obtain the coated kraft paper.

[0027] In this embodiment, the die head temperature of the laminating casting machine is 260±3°C, the laminating amount is 15±3g / ㎡, the machine speed is 150m / min, the unwinding tension is 6-13Kgf, and the winding tension is 20-42Kgf.

[0028] Step 2: Reinforcement lamination: In order to make the base material have better tensile properties, a layer of reinforcing ribs 13 (i.e., yarn) is embedded between the two layers of kraft paper, and the three layers of base material are well bonded together through a high-temperature lamination process to form a whole;

[0029] In this embodiment, the coated kraft paper is pulled into the guide roller of the heating machine, and the kraft paper is heated and melted by the high-temperature drying cylinder. The reinforcing ribs 13 are laid on the coating layer. The reinforcing rib yarn is selected from glass fiber or polyester yarn, and the yarn thickness is 30~50tex (a unit of linear density. The symbol is tex, also known as "number", which refers to the weight of 1000 meters of yarn in grams). The yarn is diamond-shaped or square, and the line spacing is 8~15mm. After the reinforcement is laid, a layer of the same 65g kraft paper is attached to the reinforcement. The three layers of substrate are compounded together by the high-temperature pressing roller, and then cooled and rolled by the cooling roller to obtain a composite substrate-reinforced kraft paper. The compounding pressure of the high-temperature pressing roller is 0.6MPa.

[0030] In this embodiment, the yarn thickness is 38tex, the spacing between the reinforcing rib yarns is 12mm, the high-temperature drying cylinder temperature is 130±5°C, the high-temperature pressure roller temperature is 140±3°C, the machine speed is 15-20 m / min, the unwinding tension is 3~6Kgf, and the winding tension is 30~32Kgf.

[0031] Step 3: impregnation, in order to make the kraft paper have better moisture retention, the paper is allowed to absorb a certain amount of moisturizing agent (in this embodiment, glycerol is selected);

[0032] In this embodiment, the reinforced kraft paper is pulled into the impregnation machine, and the paper is immersed in the impregnation tank to absorb the impregnation liquid. The impregnation liquid is composed of 95% industrial glycerin and water. The industrial glycerin and water are mixed in a volume ratio of 1:1. After the paper fully absorbs the glycerin, the excess impregnation liquid is squeezed out by a rubber roller, and then the paper is dried in an oven. In this embodiment, there are 2 ovens in total, the temperature in the oven is 110~130℃, the machine speed is 150~200m / min, the unwinding tension is 1~4Kgf, and the winding tension is 30~38Kgf. The moisture content of the paper after drying is controlled at 7~9%.

[0033] Step 4: Apply glue, apply environmentally friendly starch adhesive 2 on one side of the reinforced kraft paper;

[0034] The impregnated reinforced kraft paper is pulled into the guide roller of the glue coating machine, and the adhesive (starch glue) is drawn into the glue tank, and the temperature of the adhesive is maintained between 80 and 85°C; the machine is started, the initial speed of the machine is 10 to 20 m / min, and the adhesive is brought to the paper surface by a glue roller, and the excess adhesive is scraped off the glued paper surface by a wire rod, and the amount of dry glue is controlled at 28 to 30 g / ㎡. The high / low amount of glue is controlled by the size of the wire rod. In this embodiment, a 12# wire rod is used; after the glue amount is adjusted and stabilized, the machine speed is slowly increased to 35 to 40 m / min, and after the glue is applied, the wet starch glue is dried in 8 ovens, the oven temperatures of the 1st to 3rd sections are 60 to 75°C, the oven temperatures of the 4th to 5th sections are 75 to 90°C, and the oven temperatures of the 6th to 8th sections are 65 to 80°C. Finally, the moisture content is controlled at 7 to 9%, and the starch glue loses its viscosity after drying. After drying, the back of the tape is shaped at high temperature through a drying cylinder, and the temperature of the drying cylinder is controlled at 100~110℃. After shaping, it enters the cooling roller for cooling and winding, and the temperature of the cooling roller is controlled at 8~12℃. The unwinding tension is 6~10Kgf, the winding tension is 35~40Kgf, and the moisture content of the paper after drying is controlled at 7~9%.

[0035] Step 5: Rewind and cut to make the finished tape of the required size. That is, rewind and cut the glue-coated mother roll to get the finished tape, and mark the sample.

[0036] The comparison test between the utility model and the conventional kraft paper tape in the prior art is shown in the following table

[0037]

[0038] The utility model has three obvious characteristics: (1) the tape is environmentally friendly, using wood pulp paper as the main base material and starch glue as the adhesive, which is environmentally friendly and easy to degrade; (2) the tape has high tensile strength, the tape of the utility model is embedded with yarn, which improves the tensile strength of the tape and can meet the sealing requirements of light and heavy packaging; (3) it is not easy to curl, and the tape remains flat and does not curl in an environment with a humidity of less than 40%. The utility model changes the moisture content of the paper on both sides of the tape and combines a special structural design, so that the kraft paper has a certain humidity on the adhesive surface in a dry environment, reduces paper shrinkage, and keeps the stress on both sides of the paper consistent to achieve the effect of not curling.

Claims

1. A non-curling reinforced kraft paper tape, characterized by: The kraft paper tape comprises a composite substrate layer (1) and an adhesive layer (2), wherein the composite substrate layer (1) and the adhesive layer (2) are composited together, wherein the composite substrate layer (1) comprises kraft paper (11), an adhesive (12) and a reinforcing rib (13), wherein the kraft paper (11) comprises a surface layer of kraft paper (111) and a bottom layer of kraft paper (112), wherein the reinforcing rib (13) is arranged between the surface layer of kraft paper (111) and the bottom layer of kraft paper (112), wherein the surface layer of kraft paper (111) and the bottom layer of kraft paper (112) are bonded together by the adhesive (12), and wherein the adhesive layer (2) and the bottom layer of kraft paper (112) are bonded together.

2. The non-curling reinforced kraft paper tape according to claim 1 is characterized by: The surface kraft paper (111) and the bottom kraft paper (112) are made of wood pulp paper, and glycerol is absorbed in the surface kraft paper (111) and the bottom kraft paper (112).

3. The non-curling reinforced kraft paper tape according to claim 1 is characterized by: The adhesive layer (2) is made of starch glue.

4. The non-curling reinforced kraft paper tape according to claim 1 is characterized by: The kraft paper (11) is selected from 35-60g natural color kraft paper.

5. The non-curling reinforced kraft paper tape according to claim 1 is characterized by: The reinforcing ribs (13) are made of yarn.

6. The non-curling reinforced kraft paper tape according to claim 5 is characterized by: The yarn is glass fiber or polyester yarn.

7. The non-curling reinforced kraft paper tape according to claim 5 is characterized by: The yarn thickness is 30-50tex.

8. The non-curling reinforced kraft paper tape according to claim 5, characterized in that: The yarns are arranged in a diamond-shaped or square shape, with a thread spacing of 8 to 15 mm.

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