HIGHLY-TENSILE KRAFT ADHESIVE PAPER TAPE AND MANUFACTURING PROCESS THEREOF

The invention provides a highly-tensile kraft paper adhesive tape and a manufacturing process thereof. The adhesive tape includes a kraft paper layer, a plurality of yarn layers, a kraft paper layer and glue layers, which are fixedly connected in sequence; the specific number of layers of the plurality of yarn layers can be multi-layered according to actual situations, and the two adjacent yarn layers, and each kraft paper layer and the corresponding yarn layer, are fixedly connected by adhesion layers. Yarns in the yarn layers are classified into warp yarns and weft yarns, which are distributed crosswise. The tensile strength of the adhesive tape can be effectively improved by providing the two kraft paper layers to form a matrix of the adhesive tape. A plurality of yarn layers are provided between the two kraft paper layers to improve the structural stability of the moisture-permeable and water-proof adhesive tape.

CROSS-REFERENCE TO RELATED APPLICATIONS

The application claims priority to Chinese patent application No. 2022102005979, filed on Mar. 3, 2022, the entire contents of which are incorporated herein by reference.

TECHNICAL FIELD

The present invention relates to the field of adhesive tapes, in particular to a highly-tensile kraft paper adhesive tape and a manufacturing process thereof.

BACKGROUND

An adhesive tape has the characteristics that: it can be easily adhered in the presence of a small pressure, can take an adhesion effect in a short time, does not contaminate an adherend after peeling, and can be re-corrected in the case of wrong pasting. Taking a kraft paper adhesive tape as an example, the kraft paper adhesive tape takes kraft paper as a base material, which is coated with glue on one side to form an adhesive tape with high viscosity. However, the current kraft paper adhesive tape is generally poor in tear resistance, as a result of a relatively simple structure of the current kraft paper adhesive tape.

SUMMARY

In view of the defects proposed in the above-mentioned background art, the present invention provides a highly-tensile kraft adhesive paper tape and a manufacturing process thereof.

The present invention adopts the following technical solutions.

A highly-tensile kraft paper adhesive tape is characterized by including a kraft paper layer, a plurality of yarn layers, a kraft paper layer and glue layers, which are fixed connected in sequence, wherein

among the plurality of yarn layers, the respective yarn layers are laminated in sequence and arranged between the two kraft paper layers; and yarns in the yarn layers are classified into warp yarns and weft yarns, which are distributed crosswise, such that an array of diamond-shaped meshes is formed in each yarn layer.

As an improvement of the above-mentioned adhesive tape, in each of the yarn layers, within a distance of 10 mm 1 to 10 warp yarns and 1 to 10 weft yarns are disposed respectively.

As an improvement of the above-mentioned adhesive tape, each kraft paper adhesive layer has a specification of 20-300 g/m2.

As an improvement of the above-mentioned adhesive tape, each glue layer has a coating weight of 5-100 g/m2.

A manufacturing process of the highly-tensile kraft adhesive paper tape includes the following steps:enabling the respective kraft paper layers and the respective yarn layers to pass through two heat-conducting rollers of compounding equipment respectively and then connecting to drawing equipment, and providing the kraft paper layer, the plurality of yarn layers and the kraft paper layer in sequence in a gap between the two heat-conducting rollers of the compounding equipment from bottom to top; and meanwhile, enabling the respective yarn layers to pass over a flat plate before entering the compounding equipment, and drawing the lower kraft paper layer to move in parallel under the flat plate; and the process of drawing the respective kraft paper layers and respective yarn layers to move includes the following steps:S1: when the respective yarn layers are drawn to move onto the flat plate, coating the surfaces of the yarn layers with composite glue; and when the yarn layers coated with the composite glue move out of the flat plate. i.e., laminated on the lower kraft paper layer, drawing the respective yarn layers to move between the two kraft paper layers;S2: when the respective yarn layers are drawn to move between the two kraft paper layers, but not drawn to the compounding equipment, preheating at a preheating temperature of 30 to 200° C.;S3: when the respective kraft paper layers and respective yarn layers move to the compounding equipment, heating the composite glue of the yarn layers by using the two heat-conducting rollers of the compounding equipment; and meanwhile, pressing and compounding the kraft paper layers and the yarn layers by using the two heat-conducting rollers, such that the kraft paper layers and the yarn layers are adhered in sequence by the composite glue to form the kraft paper layer, the plurality of yarn layers and the kraft paper layer that are fixed and adhered in sequence;S4: after the respective kraft paper layers and respective yarn layers pass through the two heat-conducting rollers of the compounding equipment, coating the upper surface of the upper kraft paper layer with starch glue, the starch glue being used to form the glue layers; andS5: drying and rolling the formed glue layers coated with the starch glue, thereby obtaining a fully-degradable single-layer moisture-permeable and water-proof adhesive tape with high tear resistance.

As a further improvement of the above-mentioned process, a speed at which the kraft paper layers and the yarn layers are drawn to move is 10-300 m/min.

As a further improvement of the above-mentioned process, in step S1, the respective yarn layers are drawn vertically downwards or vertically upwards, and then bypass guide rollers and are horizontally drawn to the flat plate to form a state of laminated movement; and among the plurality of yarn layers moving horizontally on the flat plate, a position of the upper yarn layer that is coated with the composite glue is closer to the compounding equipment than a position of the lower yarn layer that is coated with the composite glue.

As can be seen from the above description of the present invention, compared with the prior art, the present invention has the following advantages: the tensile strength of the adhesive tape can be effectively improved by providing the two kraft paper layers so as to form a matrix of the adhesive tape. In addition, according to the present invention, the plurality of yarn layers are provided between the two kraft paper layers, which can improve the structural stability of the moisture-permeable and water-proof adhesive tape and make it difficult to deform. In summary, the kraft paper adhesive tape of the present invention has a firm structure and can resist higher strength tearing than the current kraft paper adhesive tape.

DETAILED DESCRIPTION OF THE EMBODIMENTS

The specific embodiments of the present invention are further described below by reference to the accompanying drawings.

As shown inFIG.1, a highly-tensile kraft paper adhesive tape includes a kraft paper layer1, a plurality of yarn layers2, a kraft paper layer1and glue layers3, which are fixedly connected in sequence, wherein the two adjacent yarn layers2, and each kraft paper layer1and the corresponding yarn layer2, are fixedly connected by adhesive layers4.

The kraft paper layer1is made of kraft paper, and a specification of 20-300 g/m2may be selected according to actual strength requirements.

Each of the yarn layers2is formed by weaving yarns, wherein the yarns may be made of glass fiber yarns, chemical fiber yarns, nylon yarns or the like. Referring toFIG.2again, the yarns21in the yarn layer2are classified into warp yarns and weft yarns, and within a distance of 10 mm 1 to 10 warp yarns and 1 to 10 weft yarns are disposed respectively. Meanwhile, the warp yarns and the weft yarns are distributed crosswise to form a shape in an array of a plurality of diamond-shaped meshes inFIG.2. The distribution structure of the yarns21can simultaneously improve the transverse and longitudinal tearing strength of the kraft paper adhesive tape, and at the same time make it difficult to break. In addition, the yarns21may also be distributed in parallel along a length extension direction of the kraft paper layers1as shown inFIG.3, or distributed in an S-shaped bend along the length extension direction of the kraft paper layers2as shown inFIG.4. The distribution structure of the yarns21can also improve the tear resistance of the kraft paper adhesive tape, and at the same time make it difficult to break, which is beneficial to prolong the service life of the kraft paper adhesive tape.

The specific number of layers of the plurality of yarn layers2may be multi-layered according to actual situations, and the respective yarn layers2are sequentially laminated between the two kraft paper layers1. In addition, the adhesive layers4between the two adjacent yarn layers2and between each yarn layer2and the corresponding kraft paper layer1may be composite glue, so that they are fixed by composite adhesion of the composite glue. Therefore, the respective yarn layers2are connected to the two kraft paper layers1to form a main body structure of the present invention. The strength, i.e., the tensile strength, of the adhesive tape can be further improved by providing the two kraft paper layers1.

The glue layers3are used for an adhesion purpose, and may be starch glue. The composite glue forming the adhesive layers4may be hot melt glue or EVA glue, and auxiliary agents such as a photocatalyst and a defoamer may be added to the composite glue. After absorbing light energy, the photocatalyst can directly be used for a redox reaction of an object adsorbed on the surface, thereby promoting the degradation of the kraft paper adhesive tape of the present invention. Meanwhile, the yarns21of the yarn layers2can also effectively ensure the light transmittance of the kraft paper layers1due to a crossed structure of the warp yarns and the weft yarns, thereby further promoting the redox reaction of the photocatalyst, that is, the degradation efficiency.

As shown inFIG.5, a manufacturing process of the highly-tensile kraft adhesive paper tape includes the following steps:

enabling the respective kraft paper layers1and the respective yarn layers2to pass through two heat-conducting rollers9of compounding equipment respectively and then connecting to drawing equipment (not shown), and providing the kraft paper layer1, the plurality of yarn layers2and the kraft paper layer1in sequence in a gap between the two heat-conducting rollers9of the compounding equipment from bottom to top; and meanwhile, enabling the respective yarn layers2to pass over a flat plate5before entering the compounding equipment, such that the yarn layers2are conveyed on the flat plate5before entering the compounding equipment; and drawing the lower kraft paper layer1to move in parallel under the flat plate5. The process of drawing the respective kraft paper layers1and respective yarn layers2to move includes the following steps S1 to S5.

In S1, the yarn layers2move on the flat plate5before entering the compounding equipment, the surfaces of the yarn layers2on the flat plate5are coated with composite glue, and the coated composite glue has a distance from the boundary of each yarn layer2, which can prevent the composite glue from overflowing after the kraft paper layers1and the yarn layers2are compounded. This coating manner of the composite glue can make respective diamond-shaped meshes in each yarn layer2be filled with an adhesive material (i.e., the composite glue), in order to improve the firmness level of the subsequent yarn layer2and the kraft paper layer1after being adhered. Meanwhile, a speed at which the kraft paper layers1and the yarn layers2are drawn to move is 10-300 m/min. This speed ensures that the filled composite glue can be drawn to move in the respective diamond-shaped meshes of the yarn layers2, so as to avoid the adhesion failure of the composite glue due to the excessively fast moving speed.

Further, in the case of a plurality of the yarn layers2, each of the yarn layers2is drawn vertically downward or vertically upward and then bypasses guide rollers8and is horizontally drawn onto the flat plate5to form a state of laminated movement. The guide rollers8for drawing the respective yarn layers2are arranged in sequence along a moving direction of the yarn layers2, and the positions, coated with the composite glue, of the plurality of yarn layers2that moves on the flat plate5are all located behind the guide rollers8respectively. That is, the yarn layers2first bypass the guide rollers8and are then coated with the composite glue, and meanwhile, a position of the upper yarn layer2where a coating machine6is disposed is closer to the compounding equipment than a position of the lower yarn layer2where a coating machine6is disposed, in this way, the respective yarn layers2can be embedded in a layer of composite glue, respectively. In addition, when the respective yarn layers2are coated with the composite glue and then drawn to move on the flat plate5, the composite glue coated on the respective yarn layers2can be fused with each other, such that the respective yarn layers2are laminated and adhered to form an integral body.

The lower kraft paper layer1moves horizontally under the flat plate5, and is connected to the lower side at the end of the flat plate5. This structure makes the yarn layer2coated with the composite glue move out of the flat plate5and then laminated on the lower kraft paper layer1.

In addition, the flat plate5may be provided with baffles (not shown) that are bent upward and disposed on both sides of the yarn layer2in a conveying direction. The baffles are used to block the composite glue and prevent the composite glue from flowing out to both sides. Meanwhile, a receiving groove (not shown) may also be provided under the flat plate5and used to receive a small amount of composite glue overflowing downward from the front and rear ends of the flat plate5in the conveying direction of the yarn layer2, so as to facilitate recycling.

In S2, when the respective yarn layers2are drawn to move between the two kraft paper layers1, but not drawn to the compounding equipment, the respective yarn layers2are preheated at a preheating temperature of 30 to 200° C. In this preheating method, an electric heating tube91may be respectively disposed above the upper kraft paper layer1and under the lower kraft paper layer1, so as to form a high-temperature environment to preheat the composite glue on the yarn layers2between the two kraft paper layers1, such that the composite adhesive tends to be gelatinized, which avoids the adhesion failure of the composite glue when entering the compounding equipment.

In S3, when the respective kraft paper layers1and respective yarn layers2move to the compounding equipment, the composite glue of the respective yarn layers is heated by using two heat-conducting rollers92of the compounding equipment; and meanwhile, the kraft paper layers1and the yarn layers2are pressed and compounded by using the two heat-conducting rollers9of the compounding equipment, such that the composite glue coated on the yarn layers2forms adhesive layers4for adhering the two adjacent yarn layers2, as well as each yarn layer2and the corresponding kraft paper layer1, thereby forming the kraft paper layer1, the plurality of yarn layers2and the kraft paper layer1which are fixedly adhered in sequence.

In S5, after the respective kraft paper layers and respective yarn layers pass through the compounding equipment, the upper surface of the upper kraft paper layer1is coated with starch glue, the starch glue being used to form the glue layers3. It is worth mentioning that the coating methods in this embodiment may all be operated by the coating machine6.

In S6: the formed glue layers3coated with the starch glue are dried and rolled, thereby obtaining a fully-degradable single-layer moisture-permeable and water-proof adhesive tape with high tear resistance. For a specific drying method, a hot air blower93may be used to blow hot air upward from the lower kraft paper layer1so as to promote the curing of the starch glue, wherein the temperature of the hot air is 32 to 40° C.

It can be seen from the above process that the one-time composite molding of the plurality of kraft paper layers1and the respective yarn layers2can be completed by drawing the respective kraft paper layers1and the respective yarn layers2to pass through respective procedures in the composite molding process of the kraft paper adhesive tape, without moving to another location for secondary processing, which is very simple and helps to improve the production efficiency of the kraft paper adhesive tape of the present invention.

The above content is only specific embodiments of the present invention, but the design concept of the present invention is not limited to this, and any non-substantial modification of the present invention using this concept shall be regarded as an act infringing the protection scope of the present invention.