Method for preparing a wrapping paper from slag wool

Abstract

This invention belongs to the field of packaging paper production technology, specifically relating to a method for preparing packaging paper from slag wool. To provide a new papermaking raw material that improves paper performance without polluting the environment, this invention uses slag wool and hot-melt fiber as raw materials. After unpacking the slag wool bales and removing the slag balls, the hot-melt fiber bales are also unpacked. The slag wool and hot-melt fiber, after removing the slag balls, are mixed in a specific ratio, dispersed, and then laid into a felt. During the conveying process, a 0.1% silane coupling agent is atomized and sprayed in. The mixture is then blown into a fiber web using airflow forming technology, and hot-pressed into shape by surface bonding hot rolling mills. Finally, it is rolled into a roll to form packaging paper.

Description

Technical Field

[0001] This invention belongs to the field of packaging paper production technology, and specifically relates to a method for preparing packaging paper from slag wool. Background Technology

[0002] Paper is a necessity in people's production and daily life. Traditional papermaking methods use plant fibers as raw materials and employ wet papermaking. The production process is divided into pulping and papermaking. Pulping is the process of breaking down plant fiber raw materials into unbleached pulp or bleached pulp using mechanical, chemical, or a combination of both methods. Papermaking is the process of combining pulp fibers suspended in water through various processing steps to form paper sheets that meet various requirements.

[0003] Papermaking raw materials are mostly wood, and there is an urgent need to find new papermaking raw materials that can partially replace plant fibers, improve paper performance, and avoid environmental pollution. With the development of inorganic fiber and synthetic fiber technology, modern papermaking raw materials have a new direction, and it is possible to use inorganic fibers, either wholly or partially, to prepare paper with specific properties.

[0004] Therefore, there is a need in this field for new papermaking raw materials that can improve paper performance without polluting the environment in order to prepare packaging paper. Summary of the Invention

[0005] This invention addresses the above-mentioned problems by providing a method for preparing packaging paper from slag wool. The method uses slag wool and hot melt fiber as the main raw materials and employs dry papermaking technology to produce paper with excellent properties.

[0006] To achieve the above objectives, the present invention employs the following technical solution:

[0007] This invention provides a method for preparing packaging paper from slag wool, the main raw materials being slag wool and hot-melt fiber, comprising the following steps:

[0008] Step 1: Open the packaged slag cotton bales and hot melt fiber cotton bales;

[0009] Step 2: Remove the slag balls from the slag wool after opening the package;

[0010] Step 3: Mix the slag wool and hot melt fiber to form a cotton ball;

[0011] Step 4: Tear the large clumps of slag wool and hot melt fiber into small pieces, that is, disperse the cotton clumps;

[0012] Step 5: The dispersed cotton balls are rotated at high speed to further comb them into single fibers, which are then transported by airflow to form a fiber web;

[0013] Step 6: The fiber web is thermally bonded. Some of the hot-melt fibers in the fiber web melt, flow, and diffuse to form a bond. After cooling, it is rolled into a roll to form packaging paper.

[0014] Furthermore, the slag wool is a mineral fiber formed by centrifugation and granulation of metallurgical hot melt slag. The slag wool has a diameter of 2-5μm, a slag ball mass content of less than 7% with a diameter ≥0.25mm, a length of 20-45mm, and a white color.

[0015] Furthermore, the hot-melt fiber is one or more of low-melting-point polyester fiber, polyethylene fiber, polypropylene fiber, and ES fiber, and the hot-melt bonding temperature of the hot-melt fiber is 80-300℃, and the fiber length is 10-40mm.

[0016] Furthermore, physical methods are used to remove slag balls from the unpacked slag wool, reducing the mass content of slag balls with a diameter greater than 0.25 mm to below 1%.

[0017] Furthermore, the hot-melt fibers account for 20%-30% of the mass of the cotton ball.

[0018] Furthermore, during the airflow delivery process, a silane coupling agent is atomized and sprayed in.

[0019] Furthermore, the areal density of the fiber web is 80 g / m². 2 -400g / m 2 .

[0020] Furthermore, the pressure of the hot rolling bonding is controlled at 1500N / cm-9000N / cm, and the temperature is controlled at 80℃-300℃.

[0021] The present invention also provides a method for preparing packaging paper from slag wool.

[0022] Furthermore, the areal density of the packaging paper is 89 g / m³. 3 It has a whiteness of 74%, a burst strength of 231 kPa, and a longitudinal tear strength of 553 mN.

[0023] Compared with the prior art, the present invention has the following advantages:

[0024] (1) The present invention uses slag wool fiber prepared from metallurgical hot melt slag as raw material. The raw material source is extremely abundant, does not pollute the environment and does not damage the ecological environment.

[0025] (2) Metallurgical hot melt slag can be centrifuged into slag wool fibers, which have good dimensional stability, chemical resistance, heat resistance and flame retardancy. They can also be tightly bonded to hot melt binders without producing harmful substances. Therefore, using slag wool fibers prepared from metallurgical hot melt slag as raw materials to make paper can not only dispose of solid waste and turn waste into treasure, but also reduce the damage to forest resources and reduce the discharge of papermaking wastewater, achieving multiple benefits.

[0026] (3) The dry papermaking process is simple, and the resulting packaging paper has good waterproof, fireproof, moisture-proof and mildew-proof properties. Attached Figure Description

[0027] Figure 1 This is a flowchart of the method for preparing packaging paper from slag wool according to the present invention. Detailed Implementation

[0028] To further illustrate the technical solution of the present invention, the present invention will be further described below through embodiments.

[0029] Example 1

[0030] The raw materials for this embodiment are slag wool and hot-melt fiber. Slag wool is a mineral fiber formed by centrifugation and granulation of metallurgical hot-melt slag. It has a diameter of 2-5 μm, a slag ball content of ≥0.25 mm in diameter of <7%, a fiber length of 20-45 mm, and a white color. Its specific composition is shown in Table 1 below.

[0031] Table 1 Chemical Composition of Slag Wool

[0032] 40％-45％ 8％-12％ 33％-38％ 5％-10％ 2％-5％ 0.5％-4％

[0033] The hot melt fiber is made of polypropylene fiber, with a hot melt bonding temperature of 160℃ and a length of 10-40mm.

[0034] This embodiment describes a method for preparing packaging paper from slag wool, using slag wool and hot-melt fiber as the main raw materials, and includes the following steps:

[0035] Step 1, Unpacking: The unpacking machine unpacks the packaged slag cotton bales and the hot melt fiber cotton bales.

[0036] Step 2: Remove slag balls. The slag wool is separated by a pneumatic separation method to remove slag balls, reducing the mass content of slag balls with a diameter greater than 0.25mm to less than 1%, and then enters the weighing hopper.

[0037] Step 3, ingredient mixing: weigh the slag wool and hot melt fiber separately using an electronic weighing machine, mix them in proportion, and then feed them into a pre-opening machine to form cotton balls. The hot melt fiber accounts for 25% of the total mass of slag wool + hot melt fiber.

[0038] Step 4, loosening: The pre-opening machine tears the large clumps of slag wool and hot melt fiber into small pieces and feeds them into the mixing cotton box. Then, the fine opening machine continues to disperse them, and finally, the cotton is spread into a vibrating cotton box to form cotton felt.

[0039] Step 5: Airflow forming. The cotton felt is evenly fed into a high-speed rotating cylinder or licker-in roller for further combing into single fibers. The fibers fall off the saw teeth and are conveyed by airflow, condensing onto the forming curtain to form a fiber web. During the conveying process, 0.1% silane coupling agent is atomized and sprayed in (0.1% refers to the mass fraction of the silane coupling agent in the total product mass fraction). The areal density of the fiber web is 80 g / m². 2-400g / m 2 ;

[0040] Step 6, hot rolling bonding: The fiber web enters the hot rolling rollers for heating and pressure. The linear pressure between the rollers is controlled at 1500N / cm-9000N / cm, and the temperature is controlled at 80℃-300℃. Some fibers in the fiber web melt, flow, and diffuse to form bonds. After cooling, it is rolled into a roll to form packaging paper.

[0041] The performance parameters of the obtained packaging paper are as follows:

[0042] Table 2 Performance parameters of mineral wool paper

[0043] 89 74 231 553

[0044] As can be seen from Table 2, the packaging paper prepared in this embodiment has excellent performance in terms of surface density, whiteness, burst strength, and longitudinal tear strength.

[0045] The foregoing has shown and described the main features and advantages of the present invention. It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

[0046] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A method of producing a wrapping paper for slag wool, characterized in that The main raw materials are slag wool and hot melt fiber, and the process includes the following steps: Step 1: Open the packaged slag cotton bales and hot melt fiber cotton bales; Step 2: Remove the slag balls from the slag wool after opening the package; Step 3: Mix the slag wool and hot melt fiber to form a cotton ball; Step 4: Tear the large clumps of slag wool and hot melt fiber into small pieces, that is, disperse the cotton clumps; Step 5: The dispersed cotton balls are rotated at high speed to further comb them into single fibers, which are then transported by airflow to form a fiber web; Step 6: The fiber web is thermally bonded, where some of the hot-melt fibers in the fiber web melt, flow, and diffuse to form a bond. After cooling, it is rolled into a roll to form packaging paper. The slag wool is a mineral fiber formed by centrifugation and granulation of metallurgical hot melt slag. The slag wool has a diameter of 2-5μm, a slag ball mass content of less than 7% with a diameter ≥0.25mm, a length of 20-45mm, and a white color. The hot melt fiber is one or more of low melting point polyester fiber, polyethylene fiber, polypropylene fiber, and ES fiber. The hot melt bonding temperature of the hot melt fiber is 80-300℃, and the fiber length is 10-40mm. Physical methods are used to remove slag balls from the slag wool after opening the package, reducing the mass content of slag balls with a diameter greater than 0.25 mm to below 1%. During the airflow delivery process, silane coupling agent is atomized and sprayed in. The pressure of the hot rolling bonding is controlled at 1500N / cm-9000N / cm, and the temperature is controlled at 80℃-300℃.

2. The method for preparing packaging paper from slag wool according to claim 1, characterized in that, The hot-melt fibers account for 20%-30% of the mass of the cotton ball.

3. A method of preparing a wrapping paper from a slag wool according to claim 1, c h a r a c t e r i z e d in that The area density of the web is 80 g / m 2 - 400 g / m 2 .

4. Packaging paper prepared by the method for preparing packaging paper from slag wool according to any one of claims 1-3.

5. The wrapper of claim 4, wherein, The surface density of the wrapping paper is 89 g / m 2 , the whiteness is 74%, the burst resistance is 231 kPa, and the longitudinal tear resistance is 553 mN.

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