Ultra-low gram weight paper covering process and surface paper product thereof

Abstract

The invention relates to the technical field of folder production, and discloses an ultralow-gram-weight paper covering process which comprises the following steps: step 1, unwinding: putting ultralow-gram-weight toilet paper on an unwinding device, and carrying out tension control at 0.5-2 N; the PP material is heated to be in a molten state, the PP material is extruded into base cloth through an extruder, and the extrusion speed is controlled to be 10-20 m / min. 3, preheating, wherein the toilet paper with the ultralow gram weight is preheated. And 4, compounding: compounding the base cloth in the molten state and the preheated toilet paper with the ultralow gram weight through two extrusion rollers which are arranged left and right, wherein the compounding pressure is controlled to be 0.3-0.6 MPa. And 5, cooling: cooling the compounded surface paper through a cooling roller, and controlling the cooling temperature to be 50-60 DEG C. And 6, rolling, wherein the cooled surface paper is rolled. The technology can effectively solve the technical problems in the ultra-low gram weight toilet paper covering paper processing, and the prepared product has the advantages of being light in weight, environmentally friendly and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of folder production, and particularly to a super-low grammage paper laminating process and its face paper products. Background Art

[0002] Existing folder face paper includes a base cloth made of PP material and a cover paper laminated on the PP material base cloth. Since the surface energy of the PP material is relatively low, it is difficult for ordinary glue to form an effective bond on its surface. Therefore, special glue is required during the lamination process of the cover paper and the PP material base cloth, resulting in a relatively high production cost. At the same time, traditional paper laminating processes mostly use cover paper with a relatively high grammage as the base material, and its grammage is generally 70 - 80 g / m², which is difficult to meet the market demand for lightweight and environmentally friendly products. Moreover, due to the high grammage of the cover paper, the hardness and toughness of the face paper increase, and the difficulty of laminating the face paper on the cardboard in the later stage also increases, and the face paper is prone to delamination during the lamination process. Summary of the Invention

[0003] The purpose of the present invention is to provide a super-low grammage paper laminating process for folder face paper. By extruding and laminating super-low grammage toilet paper with an incompletely solidified PP material base cloth, the combination of the two can be completed without using glue, avoiding the use of special glue, reducing the production cost, and the prepared product is lightweight, environmentally friendly, and more competitive in the market.

[0004] The above technical purpose of the present invention is achieved through the following technical solutions: A super-low grammage paper laminating process includes the following steps: Step 1: Unwinding: Place the super-low grammage toilet paper on the unwinding device and control the tension, with the tension controlled at 0.5 - 2 N.

[0005] Step 2: Extrusion into cloth: Heat the PP material to a molten state and extrude it into a base cloth through an extruder, with the extrusion speed controlled at 10 - 20 m / min.

[0006] Step 3: Preheating: Preheat the super-low grammage toilet paper.

[0007] Step 4: Laminating: Laminating the molten base cloth and the preheated super-low grammage toilet paper through two extrusion rollers arranged left and right, with the lamination pressure controlled at 0.3 - 0.6 MPa.

[0008] Step 5: Cooling: Cool the laminated face paper through a cooling roller, with the cooling temperature controlled at 50 - 60 °C.

[0009] Step 6: Rewinding: Rewind the cooled face paper and control the tension, with the rewinding tension controlled at 5 - 10 N.

[0010] Furthermore, the basis weight of the ultra-low basis weight toilet paper is 12 to 18 g / m².

[0011] Furthermore, the melt index of the PP material is 20 to 50 g / 10min.

[0012] Furthermore, the ultra-low basis weight toilet paper is preheated by the extrusion roller on the left side.

[0013] Furthermore, the cooling roller and the two extrusion rollers are cooled by circulating cooling water to improve the cooling efficiency.

[0014] Furthermore, the surface temperature of the extrusion roller on the left side is controlled at 75 to 82 °C, and the surface temperature of the extrusion roller on the right side is controlled at 92 to 98 °C.

[0015] Furthermore, the surface temperature of the cooling roller is controlled at 50 to 60 °C.

[0016] Furthermore, the surface of the extrusion roller is coated with a silica gel layer to improve the composite uniformity.

[0017] An ultra-low basis weight overlaid paper process facial tissue product is prepared by the above ultra-low basis weight overlaid paper process, and the facial tissue product is used for a folder.

[0018] The outstanding effects of the present invention are: Compared with the prior art, By extruding and laminating the ultra-low basis weight toilet paper with the incompletely solidified PP material base fabric, the combination of the two can be completed without applying glue, avoiding the use of special glue and reducing the production cost; Using the ultra-low basis weight toilet paper as the base material effectively reduces the weight of the product and meets the requirements of product lightweight and environmental protection; The overall process is simple, easy to realize large-scale production, and reduces the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is the process flow chart of the present invention; Figure 2 is the schematic diagram of overlaid paper of the present invention.

[0020] Reference numerals: 1, base fabric; 2, ultra-low basis weight toilet paper; 3, extrusion roller; 4, cooling roller; 5, facial tissue. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] The following will further describe in detail the specific embodiments of the present invention in conjunction with the drawings and embodiments. The following embodiments are used to illustrate the present invention, but are not used to limit the scope of the present invention.

[0022] The following will refer to Figures 1 to 2 to illustrate the embodiments of the present invention: Example 1

[0023] Step 1. Place the ultra-low-gram-weight toilet paper with a gram weight of 15 g / m² on the unwinding device and set the tension to 1 N.

[0024] Step 2. Heat the PP material to 200 °C. The melt index of the PP material is 35 g / 10 min and it is extruded into the base cloth 1 through an extruder, and the extrusion speed is controlled at 20 m / min.

[0025] Step 3. Make the ultra-low-gram-weight toilet paper 2 contact the left extrusion roller prior to the base cloth and preheat it through the left extrusion roller.

[0026] Step 4. Compound the not-yet-completely-solidified base cloth and the preheated ultra-low-gram-weight toilet paper through two extrusion rollers. The compounding pressure is set to 0.4 MPa. The surfaces of the extrusion rollers are coated with a silica gel layer. The two extrusion rollers are cooled by cooling circulating water. The surface temperature of the left extrusion roller is controlled at 78 °C, and the surface temperature of the right extrusion roller is controlled at 92 °C.

[0027] Step 5. Cool the compounded facial tissue 5 through the cooling roller 4. The cooling roller is cooled by cooling circulating water, and the cooling temperature is set to 50 °C.

[0028] Step 6. Wind up the cooled facial tissue and set the winding tension to 8 N. Example 2

[0029] Step 1. Place the ultra-low-gram-weight toilet paper with a gram weight of 15 g / m² on the unwinding device and set the tension to 0.5 N.

[0030] Step 2. Heat the PP material to 200 °C. The melt index of the PP material is 35 g / 10 min and it is extruded into the base cloth through an extruder, and the extrusion speed is controlled at 15 m / min.

[0031] Step 3. Make the ultra-low-gram-weight toilet paper contact the left extrusion roller prior to the base cloth and preheat it through the left extrusion roller.

[0032] Step 4. Compound the not-yet-completely-solidified base cloth and the preheated ultra-low-gram-weight toilet paper through two extrusion rollers. The compounding pressure is set to 0.3 MPa. The surfaces of the extrusion rollers are coated with a silica gel layer. The two extrusion rollers are cooled by cooling circulating water. The surface temperature of the left extrusion roller is controlled at 75 °C, and the surface temperature of the right extrusion roller is controlled at 98 °C.

[0033] Step 5. Cool the compounded facial tissue through the cooling roller. The cooling roller is cooled by cooling circulating water, and the cooling temperature is set to 60 °C.

[0034] Step 6. Wind up the cooled facial tissue and set the winding tension to 5 N. Example 3

[0035] Step 1. Place the ultra-low basis weight toilet paper with a basis weight of 15 g / m² on the unwinding device and set the tension to 2 N.

[0036] Step 2. Heat the PP material to 200 °C. The melt index of the PP material is 35 g / 10min and it is extruded into a base fabric through an extruder, and the extrusion speed is controlled at 10 m / min.

[0037] Step 3. Make the ultra-low basis weight toilet paper contact the left extrusion roller prior to the base fabric and preheat it through the left extrusion roller.

[0038] Step 4. Compound the not yet fully coagulated base fabric and the preheated ultra-low basis weight toilet paper through two extrusion rollers. Set the compounding pressure to 0.6 MPa. The surfaces of the extrusion rollers are coated with a silica gel layer. The two extrusion rollers are cooled by cooling circulating water. The surface temperature of the left extrusion roller is controlled at 82 °C, and the surface temperature of the right extrusion roller is controlled at 95 °C.

[0039] Step 5. Cool the compounded facial tissue through a cooling roller. The cooling roller is cooled by cooling circulating water, and the cooling temperature is set to 55 °C.

[0040] Step 6. Wind up the cooled facial tissue and set the winding tension to 10 N.

[0041] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the technical principle of the present invention, several improvements and modifications can be made. These improvements and modifications made under the above assumptions should also be regarded as the protection scope of the present invention.

Claims

1. An ultra-low grammage paper covering process, characterized in that, It includes the following steps: Step 1: Unwinding: Place the ultra-low basis weight toilet paper on the unwinding device and conduct tension control, with the tension controlled at 0.5 - 2 N; Step 2: Extruding into fabric: Heat the PP material to a molten state and extrude it into a base fabric through an extruder, with the extrusion speed controlled at 10 - 20 m / min; Step 3: Preheating: Preheat the ultra-low basis weight toilet paper; Step 4: Laminating: Laminating the molten base fabric and the preheated ultra-low basis weight toilet paper through two extrusion rollers arranged left and right, with the lamination pressure controlled at 0.3 - 0.6 MPa; Step 5: Cooling: Cool the laminated tissue paper through a cooling roller, with the cooling temperature controlled at 50 - 60 °C; Step 6: Rewinding: Rewind the cooled tissue paper and conduct tension control, with the rewinding tension controlled at 5 - 10 N.

2. The ultra-low grammage duplexing process according to claim 1, wherein The basis weight of the ultra-low basis weight toilet paper is 12 - 18 g / m².

3. The ultra-low grammage double-sided paper process according to claim 1, characterized in that The melt index of the PP material is 20 - 50 g / 10min.

4. The ultra-low grammage duplexing process according to claim 1, wherein The ultra-low basis weight toilet paper is preheated through the left extrusion roller.

5. The ultra-low grammage duplexing process according to claim 4, wherein, The cooling roller and the two extrusion rollers are cooled by circulating cooling water.

6. The ultra-low grammage duplexing process according to claim 5, wherein The surface temperature of the left extrusion roller is controlled at 75 - 82 °C, and the surface temperature of the right extrusion roller is controlled at 92 - 98 °C.

7. The ultra-low grammage duplexing process according to claim 5, characterized in that, The surface temperature of the cooling roller is controlled at 50 - 60 °C.

8. The ultra-low grammage double-sided paper process according to claim 1, wherein The surface of the extrusion roller is coated with a silica gel layer.

9. An ultra-low grammage cover paper product for the repeat paper process, characterized in that, It is prepared by using the ultra-low basis weight paper laminating process described in any one of claims 1 - 8.

10. The ultra-low grammage duplex paper product according to claim 9, wherein, The tissue paper product is used for file folders.

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