CN109024073A - A kind of high tensile paper and preparation method thereof - Google Patents

Abstract

The invention relates to a high tensile strength paper, comprising a paper base layer and a surface sizing layer, the paper base layer contains 100% coniferous wood pulp, the sizing layer contains 20%-50% acrylic acid, 30%-70% VAC, 10%‑30% polyurethane resin, 0.5%‑3% surface sizing agent. The high tensile strength paper and its preparation method are composed of a paper base layer and a sizing layer, and have the following advantages. First, the raw material used in the present invention is all wood pulp without using chemical fibers, and the cost is relatively low; second, the present invention The sizing agent used is safe and environment-friendly, and has no toxic and side effects; thirdly, the polyurethane resin is applied to surface sizing; fourthly, the preparation method of the present invention is simple and easy, and is suitable for wide-scale popularization and use.

Description

A kind of high tensile strength paper and its preparation method

technical field

The invention belongs to paper-based materials, in particular to a high tensile strength paper and a preparation method thereof.

Background technique

High tensile strength paper is widely used in packaging, printing, compounding, etc. Most of the high-strength papers on the market are prepared by adding chemical fibers and impregnating them with adhesives. Although the paper prepared in this way has high strength, its cost is also high, and it is not environmentally friendly, and it is easy to emit pungent odor under high temperature.

Therefore, aiming at the above content, the present invention provides a high tensile strength paper with low cost, good strength, safety and environmental protection.

Contents of the invention

In view of the above situation, the technical problem to be solved by the present invention is that although the traditionally prepared paper has high strength, its cost is also high, and it is not environmentally friendly, and it is easy to emit pungent odor at high temperature.

To achieve the above object, the present invention provides the following technical solutions: a high tensile strength paper, comprising a paper base layer and a surface sizing layer, the paper base layer contains 100% coniferous wood pulp, and the sizing layer contains 20%-50 % acrylic, 30%-70% VAC, 10%-30% polyurethane resin, 0.5%-3% surface sizing agent.

A method for preparing high tensile strength paper comprises the following steps.

Step 1: beating 100% coniferous wood pulp to a fineness of 23-26°SR and a wet weight of 18-20g to form a paper-based material;

Step 2: Weigh 20%-50% of acrylic resin, 30%-70% of VAC, 10%-30% of polyurethane resin, 0.5%-3% of surface sizing agent, mix them, and carry out Stir evenly to form a coating solution;

Step 3: The coating solution formed in step 2 is evenly distributed on the paper base material formed in step 1 through the coating machine in the form of surface sizing processing, and the paper speed is 10-100m/min, per square meter The amount of gluing is 10-40g.

Preferably, in the first step, fourdrinier or inclined wire paper machine is used for papermaking.

Preferably, the sizing concentration in the third step is 5%-10%.

Preferably, the coating machine in the step 3 includes a frame, a glue tank, a rubber hose, a cloth roll, a coating roll, a release film and a paper guide roll, and the rolling bearings are movably connected in sequence from top to bottom on the frame There are cloth rolling rollers, coating rollers and paper guide rollers, and the glue tank is fixed by bolts on the top of the frame. One end of the molded film is wound and fixed on the cloth roll, and the other end of the release film is wound around the coating roll and fixedly bonded to another cloth roll.

Preferably, the cloth winding roller, coating roller and paper guide roller are externally connected with motors, and the rotation directions of the three are consistent, and the cloth winding roller is arranged symmetrically with respect to the coating roller, and the coating rollers are driven by gears.

Compared with the prior art, the advantages and beneficial effects of the present invention are: the high tensile strength paper and its preparation method are composed of a paper base layer and a sizing layer. The raw material of the paper base layer is all wood pulp, which is produced according to the traditional papermaking process. to make. Because the pulp used is coniferous wood pulp, it has high tensile strength after special surface treatment, and has the following advantages. First, the raw material used in the present invention is all wood pulp without chemical fiber, and the cost is low; second, the present invention The sizing agent used in the invention is safe and environmentally friendly, and has no toxic and side effects; thirdly, the polyurethane resin is applied to surface sizing; fourthly, the preparation method of the invention is simple and easy, and is suitable for wide-scale popularization and use.

Description of drawings

Fig. 1 is a schematic diagram of the front view of the coating machine of the present invention.

In the figure: 1. frame, 2. glue tank, 3. rubber hose, 4. cloth roll, 5. coating roll, 6. release film, 7. paper guide roll.

Detailed ways

In order to more clearly understand the inventive features, technical means and effects of the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention. rather than all examples. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Example 1

Step 1: beat 100% coniferous wood pulp to a pulp density of 24°SR and a wet weight of 18-20g, and make paper base materials by inclined wire paper machine;

Step 2: Weighing 20% of acrylic resin, 68% of PVAC, 10% of polyurethane resin, and 2% of surface sizing agent, and mixing them, and stirring evenly to form a coating solution;

Step 3: The coating solution formed in step 2 is evenly distributed on the paper base material formed in step 1 through the coating machine in the form of surface sizing processing, and the paper speed is 10-100m/min, per square meter The amount of sizing is 10-40g, and the sizing concentration is 5%.

Example 2

Step 1: beat 100% coniferous wood pulp to a pulp density of 25°SR and a wet weight of 18-20g, and make paper base materials by inclined wire paper machine;

Step 2: Weighing 30% of acrylic resin, 48% of PVA, 21% of polyurethane resin, and 1% of surface sizing agent, and mixing them, and stirring evenly to form a coating solution;

Step 3: The coating solution formed in step 2 is evenly distributed on the paper base material formed in step 1 through the coating machine in the form of surface sizing processing, and the paper speed is 10-100m/min, per square meter The amount of sizing is 10-40g, and the sizing concentration is 8%.

Example 3

Step 1: beat 100% coniferous wood pulp to a pulp density of 25°SR and a wet weight of 18-20g, and make paper base materials by inclined wire paper machine;

Step 2: Weighing 40% of acrylic resin, 40% of VAC, 18% of polyurethane resin, and 2% of surface sizing agent, and mixing them, and stirring evenly to form a coating solution;

Step 3: The coating solution formed in step 2 is evenly distributed on the paper base material formed in step 1 through the coating machine in the form of surface sizing processing, and the paper speed is 10-100m/min, per square meter The amount of sizing is 10-40g, and the sizing concentration is 5%.

Example 4

Step 1: beat 100% coniferous wood pulp to pulp fineness 26°SR, wet weight 18-20g, and make paper base material by inclined wire paper machine;

Step 2: Weighing 40% of acrylic resin, 30% of VAC, 29% of polyurethane resin, and 1% of surface sizing agent, and mixing them, and stirring evenly to form a coating solution;

Step 3: The coating solution formed in step 2 is evenly distributed on the paper base material formed in step 1 through the coating machine in the form of surface sizing processing, and the paper speed is 10-100m/min, per square meter The amount of sizing is 10-40g, and the sizing concentration is 8%.

The finished product obtained in Examples 1 to 4 of the present invention is subjected to a performance test, and the results are as follows:

As can be seen from the table, the present invention has higher tensile strength, and embodiment 4 has the best performance.

Example 5

The coating machine in step 3 of the present invention comprises frame 1, glue tank 2, rubber delivery pipe 3, cloth rolling roller 4, coating roller 5, release film 6 and paper guide roller 7, on frame 1 from top to bottom Rolling bearings in the lower order are movably connected with cloth rolling roller 4, coating roller 5 and paper guide roller 7, and the top bolt of frame 1 is fixed with glue tank 2, and glue tank 2 is flange-tightly connected with rubber delivery tube 3, and the rubber delivery tube The outlet end face of 3 is located directly above the surface of the release film 6, one end of the release film 6 is wound and fixed on the cloth roll 4, and the other end of the release film 6 is wound around the coating roll 5 and connected with another cloth roll 4 fixed bonding. Cloth winding roller 4, coating roller 5 and paper guide roller 7 are all externally connected with motors, and the rotation directions of the three are consistent, and cloth winding roller 4 is arranged symmetrically with respect to coating roller 5, and the coating rollers 5 are driven by gears .

When gluing, the coating solution can be poured into the glue box 2, and the coating solution in the glue box 2 is sprayed on the release film 6 through the rubber tube 3. Cloth roller 5 passes through, and under the action of paper guide roller 7, it can drive the paper to move continuously. At the same time, cloth roll 4 cooperates with each other to continuously drive the release film 6 to rotate. When pasting and synchronously passing through the coating roller 5, the passing through the coating roller 5 can squeeze the release film 6 and the paper, so that the release film 6 and the paper are fully bonded together, and the release film 6 The glue on the paper is transferred to the paper, and finally the release film 6 is peeled off from the paper, thereby completing the gluing work on the paper.

Compared with the traditional coating machine, the coating machine can indirectly contact the paper when gluing the paper. The traditional coating machine coating roller 5 is in direct contact with the paper, so that the impurities on the coating roller 5 Dust and dust will not directly contact with the paper, so as to avoid affecting the gluing effect of the paper, and ensure that the gluing of the paper is even, and it can be double-sided gluing at the same time to improve work efficiency.

The present invention has been described in detail through specific implementations and examples above, but these are not intended to limit the present invention. Without departing from the principle of the present invention, those skilled in the art can also make many modifications and improvements, which should also be regarded as the protection scope of the present invention.

Claims (6)

1. a kind of high tensile paper, including paper substrate and top sizing layer, it is characterised in that: the paper substrate contains 100% needle Leaf wood pulp, acrylic acid of the glue application layer containing 20%-50%, the polyurethane resin of the VAC of 30%-70%, 10%-30%, The Cypres of 0.5%-3%.

2. a kind of method for preparing a kind of high tensile paper described in claim 1, includes the following steps.

Step 1: 100% softwood pulp is beaten to 23-26 ° of SR of the degree of beating, weight in wet base 18-20g, paper base material is formed；

Step 2: the acrylic resin that percentage is 20%-50%, the polyurethane of the VAC of 30%-70%, 10%-30% are weighed Resin, the Cypres of 0.5%-3%, and mixed, and carry out uniform stirring, form coating fluid；

Step 3: the coating fluid formed in step 2 is evenly distributed in the form of top sizing processing by step coating machine On the paper base material formed in rapid one, chart drive speed 10-100m/min, every square metre of spread is 10-40g.

3. a kind of high tensile paper according to claim 2 and preparation method thereof, it is characterised in that: in the step 1 It is manufactured paper with pulp using fourdrinier wire or oblique net paper machine.

4. a kind of high tensile paper according to claim 2 and preparation method thereof, it is characterised in that: in the step 3 Sizing concentration is 5%-10%.

5. a kind of high tensile paper according to claim 2 and preparation method thereof, it is characterised in that: in the step 3 Coating machine include rack (1), glue case (2), glue conveying box (3), cloth beam (4), applicator roll (5), release film (6) and dancing roll (7), successively rolling bearing is connected with cloth beam (4), applicator roll (5) and dancing roll (7) from top to bottom in rack (1), and Rack (1) top bolt is fixed with glue case (2), and glue case (2) flange seal is connected with glue conveying box (3), and glue conveying box (3) Exit end face is located at right above release film (6) surface, and release film (6) one end winding is fixed on cloth beam (4), and release film (6) other end bypassed from applicator roll (5) and with another cloth beam (4) fixed bonding.

6. a kind of high tensile paper according to claim 5 and preparation method thereof, it is characterised in that: the cloth beam (4), applicator roll (5) and dancing roll (7) are circumscribed with motor, and the direction of rotation of three is consistent, and cloth beam (4) about Applicator roll (5) is symmetrical arranged, while being gear drive between applicator roll (5).