CN115726214B

CN115726214B - Wet end fiber shaping embossing papermaking process

Info

Publication number: CN115726214B
Application number: CN202211546286.4A
Authority: CN
Inventors: 陈连岳; 廖畅; 汤润湛; 吕培植; 谭永原; 谢观妥
Original assignee: Weida Care Products Guangdong Co ltd
Current assignee: Weida Care Products Guangdong Co ltd
Priority date: 2022-12-05
Filing date: 2022-12-05
Publication date: 2023-07-04
Anticipated expiration: 2042-12-05
Also published as: CN115726214A

Abstract

The invention discloses a wet-end fiber shaping embossing papermaking process, which belongs to the technical field of embossing papermaking processes and sequentially comprises a forming step, a pressing step, a drying step and a wrinkling step. The wet-end fiber shaping embossing papermaking process provided by the invention can realize shaping of the fiber before drying, and the fiber can be shaped according to the process requirement while the fiber is cross-woven, so that the paper has better three-dimensional space after the fiber is deformed and shaped, and has better softness and comfort.

Description

Wet end fiber shaping embossing papermaking process

Technical Field

The invention belongs to the technical field of embossing papermaking processes, and particularly relates to a wet-end fiber shaping embossing papermaking process.

Background

The traditional household paper embossing process is in a post-processing section of a papermaking process, and only paper is wrinkled in a papermaking section, so that the surface of the paper produced by the traditional household paper embossing process is shriveled, has insufficient fluffiness, relatively poor water absorption performance, and is not enough in softness and comfort to touch, and the actual requirements of the market on household paper with good softness, comfort and water absorption performance cannot be met.

Disclosure of Invention

In order to overcome the defects in the prior art, the invention aims to provide a wet-end fiber shaping embossing papermaking process, which can realize shaping of the wet-end fiber before drying, and the wet-end fiber is deformed and shaped to enable the paper to have better three-dimensional space and better softness and comfort.

In order to achieve the above purpose, the present invention adopts the following technical scheme:

the invention provides a wet-end fiber shaping, embossing and papermaking process which sequentially comprises a shaping step, a pressing step, a drying step and a wrinkling step, and is characterized by further comprising a shaping step, wherein in the shaping step, wet-end fibers on the surface of a felt are transferred to the surface of a first drying cylinder through contact with the surface of the first drying cylinder, wet-end fibers transferred to the surface of the first drying cylinder are horizontally contacted with the surface of shaping cloth through extrusion and rubbed to the surface of the shaping cloth, and the linear speed of the surface of the first drying cylinder is different from the linear speed of the surface of the shaping cloth, and the wet-end fibers rubbed to the surface of the shaping cloth are dried through a second drying cylinder.

Further, the linear velocity of the surface of the first drying cylinder is greater than the linear velocity of the surface of the forming cloth.

Further, the linear speed of the surface of the first drying cylinder is 10-25 m/s, and the linear speed of the surface of the sizing cloth is 8-20 m/s.

Further, the wet end fibers rubbed to the surface of the setting cloth are subjected to a water absorption pressure of 0.32 to 0.38MPa.

Further, the air inlet temperature of the first drying cylinder is 70-90 ℃.

Further, the air inlet temperature of the second drying cylinder is 110-120 ℃.

Further, the concentration of the wet end fibers of the felt surface is 5 to 10wt%, or 6 to 9wt%, or 7 to 8wt%.

Further, the wet-end fiber is one of a long fiber, a short fiber, and a mixed fiber, and the mixed fiber is a mixture of the long fiber and the short fiber.

Compared with the prior art, the invention has the following beneficial effects:

1. according to the wet fiber sizing embossing papermaking process provided by the invention, the wet fiber transferred to the surface of the first drying cylinder is horizontally contacted with the surface of the sizing cloth, and is rubbed to the surface of the sizing cloth by extrusion, wherein the linear speed of the surface of the first drying cylinder is different from the linear speed of the surface of the sizing cloth, namely, the connecting line of the contact point of the wet fiber transferred to the surface of the first drying cylinder and the surface of the sizing cloth and the center of the cross section of the first drying cylinder is kept horizontal, and the linear speed difference is arranged between the surface of the first drying cylinder and the surface of the sizing cloth, so that the contact pressure is generated between the surface of the first drying cylinder and the surface of the sizing cloth, the surface of the first drying cylinder is extruded, the wet fiber transferred to the surface of the sizing cloth is bent upwards, the paper subjected to sizing and drying has better bulk, the paper manufactured by the process has better three-dimensional space, the water absorption performance is good, the capacity of increasing the water capacity of 23%, the paper is also required to be made into wood pulp with 28% of the same wood pulp, and the traditional process has the same water absorption capacity of 28% and the wood pulp is greatly reduced.

2. According to the wet-end fiber shaping, embossing and papermaking process provided by the invention, the molecular acting force among the wet-end fibers is weakened by setting the air inlet temperature of the first drying cylinder to 70-90 ℃, the wet-end fibers are wound and loosened, and the wet-end fibers transferred to the surface of the first drying cylinder are ensured to have certain wrinkling and bulking before being rubbed to the surface of shaping cloth.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following description will briefly introduce the drawings that are needed in the embodiments or the description of the prior art, it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic diagram showing improvement of a papermaking process in an embossed papermaking process according to a preferred embodiment 1 of the present invention.

In the figure: 1. a mesh cloth; 2. a felt; 3. setting cloth; 4. a first dryer; 5. a second dryer; 6. and the wet end fiber transferred to the surface of the first drying cylinder is horizontally contacted with the surface of the sizing cloth.

Detailed Description

In order to make the technical problems, technical schemes and beneficial effects to be solved more clear and obvious, the invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.

Example 1

Referring to fig. 1, the line 1 is a mesh, the line 2 is a felt, the line 3 is a forming fabric, the line 4 is a first drying cylinder, the line 5 is a second drying cylinder, the line 6 is a contact point of wet fiber transferred to the surface of the first drying cylinder 4 and the surface of the forming fabric 3, the embodiment provides a wet fiber forming embossing papermaking process, which sequentially comprises a forming step, a pressing step, a drying step and a wrinkling step, and further comprises a forming step between the forming step and the pressing step, wherein in the forming step, the wet fiber on the surface of the felt 2 is transferred to the surface of the first drying cylinder 4 through contact with the surface of the first drying cylinder, the wet fiber transferred to the surface of the first drying cylinder 4 is rubbed to the surface of the forming fabric 3 through extrusion, the linear velocity of the surface of the first drying cylinder 4 is 10-25 m/s, the preferred linear velocity is 12 m/s, the linear velocity of the surface of the sizing cloth 3 is 8-20 m/s, the preferred linear velocity is 10 m/s, namely, the connecting line of the contact point 6 of the wet-end fiber transferred to the surface of the first drying cylinder 4 and the surface of the sizing cloth 3 and the center of the cross section of the first drying cylinder 4 is kept horizontal, and the linear velocity difference is formed between the surface of the first drying cylinder 4 and the surface of the sizing cloth 3, so that the contact pressure is generated between the surface of the first drying cylinder 4 and the surface of the sizing cloth 3, the extrusion is generated between the surface of the first drying cylinder 4 and the surface of the sizing cloth 3 under the action of the contact pressure, the wet-end fiber transferred to the surface of the first drying cylinder 4 is bent upwards towards the surface after reaching the surface of the sizing cloth 3, the wet-end fiber is provided with better three-dimensional space, the paper after shaping and drying has better bulk.

The wet-end fibers rubbed onto the surface of the sizing cloth 3 are dried by a second drying cylinder 5, in this embodiment, the first drying cylinder 4 is a small drying cylinder and mainly plays a role in transferring the wet-end fibers, and the second drying cylinder 5 is a large drying cylinder and has an air inlet temperature of 110-120 ℃, preferably an air inlet temperature of 120 ℃, and mainly plays a role in drying.

The air inlet temperature of the first drying cylinder 4 is 70-90 ℃, and the preferable air inlet temperature is 80 ℃, so that the molecular acting force among the wet-end fibers is weakened, the wet-end fibers are loosely wound with each other, and the wet-end fibers transferred to the surface of the first drying cylinder are ensured to have certain wrinkling and bulking before being rubbed to the surface of the sizing cloth.

The water absorption pressure of the wet end fiber rubbed on the surface of the sizing cloth 3 is 0.32-0.38MPa, and the water absorption pressure is preferably 0.35MPa, so that partial water in the sizing agent is guaranteed to be absorbed, and the fiber can be fixed on the hook lines of the sizing net.

The concentration of the wet end fibers on the surface of the felt is 5-10wt%, and the density of the wet end fibers transferred to the surface of the first drying cylinder is controlled, so that the effect of winding and loosening the wet end fibers is better.

The wet-end fibers may be one of long fibers, short fibers, and mixed fibers, wherein the mixed fibers are a mixture of long fibers and short fibers.

Comparative example 1:

unlike example 1, the papermaking process in the wet end fiber sizing and embossing papermaking process provided in comparative example 1 does not include a sizing step between the forming step and the pressing step, i.e., is a conventional paper-making embossing process.

Effect example: soaking weight gain experiment

200g of each of the papers of the same mass produced in example 1 and comparative example 1 was taken, respectively immersed in water at 25 ℃ for 5 minutes or respectively immersed in soybean oil for 5 minutes, respectively fished out after saturation, hung on a stainless steel grate, drained until no liquid drops flow, weighed by an electronic balance, and the weight and relative weight were calculated, and the relative weight was calculated as follows: (total weight of example 1-weight increase of comparative example 1)/(weight increase of comparative example. Times.100%).

Experiments show that the paper manufactured by the wet end fiber shaping embossing papermaking process provided by the embodiment 1 of the invention has better three-dimensional space and good water absorption performance, and can improve the water containing capacity and oil absorbing capacity of the paper by 23% and 28%. The process of the invention needs 23% or 28% less wood pulp than the traditional process, thus greatly saving the consumption of wood pulp, reducing the felling of wood and having better softness and comfort.

The embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, and yet fall within the scope of the invention.

Claims

1. The wet-end fiber shaping, embossing and papermaking process sequentially comprises a shaping step, a squeezing step, a drying step and a wrinkling step, and is characterized by further comprising a shaping step, wherein in the shaping step, wet-end fibers on the surface of a felt are transferred to the surface of a first drying cylinder through contact with the surface of the first drying cylinder, the wet-end fibers transferred to the surface of the first drying cylinder are horizontally contacted with the surface of a shaping cloth through extrusion and rubbed to the surface of the shaping cloth, the linear speed of the surface of the first drying cylinder is different from the linear speed of the surface of the shaping cloth, the wet-end fibers rubbed to the surface of the shaping cloth are dried through a second drying cylinder, the linear speed of the surface of the first drying cylinder is 10-25 m/s, and the linear speed of the surface of the shaping cloth is 8-20 m/s.

2. A wet end fiber sizing embossing papermaking process as set forth in claim 1, wherein the linear velocity of the surface of the first dryer is greater than the linear velocity of the surface of the sizing fabric.

3. The wet end fiber sizing, embossing and papermaking process according to claim 1, wherein the wet end fiber rubbed onto the surface of the sizing cloth is subjected to a water absorption pressure of 0.32-0.38MPa.

4. The wet end fiber sizing and embossing papermaking process according to claim 1, wherein the air inlet temperature of the first drying cylinder is 70-90 ℃.

5. The wet end fiber sizing and embossing papermaking process according to claim 1, wherein the air inlet temperature of the second drying cylinder is 110-120 ℃.

6. The wet end fiber sizing, embossing and papermaking process according to claim 1, wherein the concentration of the wet end fiber on the surface of the felt is 5-10 wt%.

7. The wet end fiber sizing and embossing papermaking process according to claim 1, wherein the wet end fiber is one of a long fiber, a short fiber and a mixed fiber, and the mixed fiber is a mixture of the long fiber and the short fiber.