CN115262083B

CN115262083B - Nonwoven flushable dry/wet towel and production method thereof

Info

Publication number: CN115262083B
Application number: CN202210928623.XA
Authority: CN
Inventors: 闻利强; 张禹
Original assignee: Xinsheng Zhejiang Nonwoven Technology Co ltd
Current assignee: Xinsheng Zhejiang Nonwoven Technology Co ltd
Priority date: 2022-08-03
Filing date: 2022-08-03
Publication date: 2023-05-02
Anticipated expiration: 2042-08-03
Also published as: CN115262083A

Abstract

The invention belongs to the technical field of flushable nonwoven materials, and particularly relates to a flushable dry/wet towel of a nonwoven and a production method thereof. The invention adopts 72-76wt% of plant fiber, 6-18wt% of viscose fiber and the rest acetate fiber as dry towel raw materials, so that the final dry towel product and the wet towel product soaked with essence have enough flushable performance and larger tensile strength. In addition, the invention also provides a production method of the dry/wet towel, and the water jet reinforcement process sequentially comprises a first water jet operation, a second water jet operation, a heating, melting and solidifying operation and a third water jet operation, so that the final towel material to be dehydrated is obtained. The special water jet reinforcement process can properly improve the tensile strength of the dry towel on the premise of not obviously sacrificing the flushable property.

Description

Nonwoven flushable dry/wet towel and production method thereof

Technical Field

The invention belongs to the technical field of flushable nonwoven materials, and particularly relates to a flushable dry/wet towel of a nonwoven and a production method thereof.

Background

The common non-woven and flushable dry towel, such as flushable toilet paper, flushable kitchen paper and the like, can be directly flushed into a sewer after being used, and the water flow can fully flushable the towel to be changed into a plurality of fragments, so that the sewer is not easy to be blocked finally. On the other hand, the wet tissue is based on the dry tissue, and the essence is soaked again, so that secondary functions such as bacteriostasis, fragrance increase and the like are added.

The invention patent publication No. CN107476102A and the Chinese patent publication No. 2017.12.15 disclose a preparation process of a hydrolyzable flushable wet tissue, which comprises the steps of pulping, pulp mixing, batching, glue making, molding, water jet entangling treatment, dehydration, drying, slitting and molding, vacuum packaging and the like, wherein the prepared wet tissue has the characteristics of being hydrolyzable and flushable, can be directly decomposed into harmless substances in water after being used, can smoothly pass through a closestool, a drainage pipeline and a sewage transmission system under the action of water flow, is convenient to process, does not need to be discarded for landfill or incineration, and reduces the pollution of the disposable product to the environment.

In the patent, the adopted paper towel raw materials are wood pulp and polylactic acid fibers or wood pulp and acetate fibers, and the preparation process is also common wet-laid and water-jet reinforcement. Finally, the wet wipe has no woven structure, similar to nonwoven fabrics and papers, and thus has the most basic flushable effect.

However, the wet tissue still has at least the following 2 disadvantages in the actual production and use process.

First, the type and ratio of the fiber raw materials are not properly selected, so that the tensile strength value of the final wet tissue is not high, and the wet tissue is easily locally split in the actual use effect.

Secondly, the water needling reinforcement operation comprises four water needling steps, but the single water needling operation cannot greatly improve the tensile strength of the wet tissue, and the structural integrity of the wet tissue can be properly improved only on the premise of ensuring the flushable performance, so that the wet tissue is prevented from being easily staggered and layered inside.

In view of the foregoing, there is a need for a new nonwoven, flushable dry/wet wipe product that has adequate flushable properties and greater tensile strength.

Disclosure of Invention

The invention provides a non-woven flushable dry/wet towel, which can lead a final dry towel product and a wet towel product soaked with essence to have enough flushable performance and larger tensile strength by taking 72-76wt% of plant fiber, 6-18wt% of viscose fiber and the rest acetate fiber as dry towel raw materials.

In addition, the invention also provides a production method of the dry/wet towel, and the water jet reinforcement process sequentially comprises a first water jet operation, a second water jet operation, a heating, melting and solidifying operation and a third water jet operation, so that the final towel material to be dehydrated is obtained. The special water jet reinforcement process can properly improve the tensile strength of the dry towel on the premise of not obviously sacrificing the flushable property.

The invention adopts the technical proposal that: the non-woven flushable dry/wet tissue is prepared from the dry tissue soaking essence, and the dry tissue comprises 72-76wt% of plant fibers, 6-18wt% of viscose fibers and the balance of acetate fibers.

In the invention, compared with wood pulp or paper pulp with the types and proportions of the fiber materials difficult to determine, the three specific fiber material formulas can be used for guiding the improvement of various working condition parameters in the subsequent water jet reinforcement process more accurately and simply.

The further preferable technical scheme is as follows: the plant fiber is 10-13% wt% of bamboo fiber and the rest is mulberry bark fiber.

In the invention, the bamboo fiber has the advantages of light weight and moderate tensile strength, while the mulberry bark fiber has the advantages of large toughness and enough elasticity. The two are combined with each other to be used as main fiber materials of the dry towel, so that the dry towel has larger tensile strength in two completely different directions of transverse direction and longitudinal direction.

The further preferable technical scheme is as follows: when the proportion of the bamboo fibers in the plant fibers is less than or equal to 12 wt%, the proportion of the viscose fibers in the fiber raw materials is more than or equal to 16 wt%;

when the ratio of the bamboo fiber in the plant fiber is more than 12 and wt percent, the ratio of the viscose fiber in the fiber raw material is less than 16 and wt percent.

In the present invention, the viscose fiber has a large elongation at break, which can be mutually assisted in tensile strength with the bamboo fiber. However, excessive viscose fibers are excessively entangled and fused together in the subsequent hydroentanglement reinforcement process, so that the flushable performance of the dry towel is reduced.

So, in a certain range, after the bamboo fiber is increased, the viscose fiber can be properly reduced, so that the flushable property of the dry towel can be further and slightly improved, and after the bamboo fiber is reduced, the dosage of the viscose fiber needs to be increased, but the viscose fiber also has the maximum ratio value, and the excessive viscose fiber cannot be added.

The production method of the nonwoven flushable dry/wet towel sequentially comprises slurry stirring, wet-process web forming and hydroentanglement reinforcement, and the hydroentanglement reinforcement process sequentially comprises the following steps:

s1, performing a first hydroentangling operation on a fiber web obtained by the wet-process web forming process to obtain a primary body of the mesh fabric;

s2, performing a second hydroentangling operation on the primary body of the mesh fabric to obtain a mesh fabric intermediate;

s3, carrying out heating, melting and solidifying operation on the mesh fabric intermediate to obtain a mesh fabric semi-finished product;

s4, performing a third hydroentangling operation on the semi-finished mesh fabric to obtain the final towel to be dehydrated.

The water jet reinforcement process in the prior art is generally four water jet, and finally can ensure that the dry towel is not easy to be layered, dislocated and disassembled in the use process, but the contribution of the existing water jet reinforcement process to the tensile strength parameter is very limited. The tensile strength of the existing water jet reinforcement process type dry towel is generally only 2-3kN/m in the longitudinal direction, and is generally only 0.4-0.5kN/m in the transverse direction, so that the high-strength use environment of the dry towel is greatly limited.

In the invention, the hydroentangling reinforcement process only has three hydroentangling operations, and proper heating, melting and solidifying operations are newly added between the second time and the third time, so that the flushable performance of the dry towel is reduced slightly, but the flushable performance level of the dry towel is not reduced.

And more importantly, the tensile strength of the dry towel can be greatly improved, the application range of the dry towel is expanded, and the dry towel can be used in kitchens and toilets, and also can be used in places such as shops, schools and the like with higher use strength and more frequent use.

The further preferable technical scheme is as follows: in S1, the water pressure of the first water jet operation is 1.5-2.2MPa.

The further preferable technical scheme is as follows: in S2, the water pressure of the second water jet operation is 4.5-7.0MPa.

In the invention, the water pressure values of three hydroentanglement operations are lower than those of the prior art, the reinforcing effect of the water pressure values on the dry towel fibers is achieved, and part of the water pressure values are born by the heating, melting and solidifying operations. In other words, the number and strength of the hydroentanglement operation in the invention are the same as those in the prior art, and the flushable performance of the final dry towel is not up to standard.

The further preferable technical scheme is as follows: in the S3, the heating, melting and solidifying operation is completed by adopting a flat-plate electric heater, the two flat-plate electric heaters are respectively arranged on two vertical inner sides of the rectangular frame body, the mesh fabric intermediate body passes through the rectangular frame body, and the short side direction is vertical.

In the invention, the width of the inner side of the rectangular frame body is 1.2-1.5 times of the width of the mesh fabric intermediate body, the width of the flat plate type electric heater is larger than the width of the mesh fabric intermediate body, and the height of the inner side of the rectangular frame body is 2.5-2.8 times of the thickness of the flat plate type electric heater, so that the distance between the mesh fabric intermediate body and the flat plate type electric heater and the heating intensity of the mesh fabric intermediate body in the rectangular frame body are all proper.

The further preferable technical scheme is as follows: s3, in the rectangular frame body, the temperature is less than or equal to 240 ℃ within the range of 2cm at each side of the middle body of the mesh cloth.

In this embodiment, the viscose fiber, the acetate fiber and the mulberry bark fiber can be properly softened and melted under the heating condition of 240 ℃, so that the dry towel is melted and combined by adding one fiber on the basis of original fiber entanglement, and the flushable grade of the dry towel is not reduced finally, but the tensile strength of the dry towel can be obviously improved.

The further preferable technical scheme is as follows: in S3, the speed of the mesh fabric intermediate body relative to the flat plate type electric heater is 1.5-3.5cm/S.

In the invention, the relative movement speed can ensure that the intermediate of the mesh cloth is sufficiently heated, and the internal fiber materials are not easy to excessively melt and combine together.

The further preferable technical scheme is as follows: in S4, the water pressure of the third water jet operation is 10.0-12.5MPa.

The present invention has the following advantages.

Firstly, the fiber types and the fiber proportion of the dry towel raw materials are selected, so that the dry towel can be guaranteed to have the most basic flushable performance, and then the wet towel is obtained after the dry towel wets essence according to the prior art.

Secondly, the specific fiber raw material proportion of the dry towel is further refined, and finally the grade 5 flushable performance grade is ensured.

Thirdly, the specific water jet reinforcement technology is matched with the specific fiber raw material proportion, and finally, the longitudinal tensile strength and the transverse tensile strength of the dry towel are superior to those of the existing dry towel product.

Fourth, in the specific water-jet reinforcement process, the temperature of the heating, melting and solidifying operation is proper, and the heating mode is proper, so that the dry towel still has a larger tensile strength value on the premise of maintaining 5-level flushable performance grades.

Drawings

Fig. 1 is a table of contents of the differences of 3 examples and 3 comparative examples in the present invention.

Figure 2 is a table of average dry towel performance test data for 3 examples, 3 comparative examples, of the present invention.

Detailed Description

The following description is of the preferred embodiments of the invention and is not intended to limit the scope of the invention.

Example 1

A non-woven flushable dry towel comprises 72wt% of plant fibers, 17.5wt% of viscose fibers and the balance of acetate fibers. The dry towel soaking essence is a non-woven flushable wet towel, and the soaking process and the essence formula adopt the existing technical conditions.

The plant fiber is 10.5-wt% of bamboo fiber and the rest is mulberry bark fiber.

In S1, the water pressure of the first water jet operation is 1.5-1.6MPa.

In S2, the water pressure of the second water jet operation is 4.5-4.8MPa.

In the S3, the heating, melting and solidifying operation is completed by adopting a flat-plate electric heater, the two flat-plate electric heaters are respectively arranged on two vertical inner sides of the rectangular frame body, the mesh fabric intermediate body passes through the rectangular frame body, and the short side direction is vertical.

In this embodiment, the width of the mesh fabric intermediate is 15cm, the width of the inner side of the rectangular frame is 20cm, the average thickness of the flat-plate type electric heater is 6cm, and the thickness of the inner side of the rectangular frame is 15cm.

S3, in the rectangular frame body, the temperature is less than or equal to 240 ℃ within the range of 2cm at each side of the middle body of the mesh cloth.

S3, the speed of the mesh fabric intermediate body relative to the flat plate type electric heater is 2.0cm/S.

In S4, the water pressure of the third water jet operation is 10.0-10.5MPa.

Finally, 10 dry tissues of this example were tested for three criteria, namely, machine direction tensile strength (kN/m), transverse direction tensile strength (kN/m), and flushability rating, and the average was taken and specific values are shown in fig. 2.

Wherein, the testing method of the longitudinal and transverse tensile strength is according to the 4 th part of GB/T24328.4-2009 toilet paper and products thereof: the tensile strength was measured.

The test method for the flushability grade was carried out in accordance with the procedure for detecting a hydrolyzable nonwoven fabric as mentioned in JISP 8135-1998.

Example 2

A non-woven flushable dry towel comprises 74wt% of plant fibers, 15.2wt% of viscose fibers and the balance of acetate fibers. The dry towel soaking essence is a non-woven flushable wet towel, and the soaking process and the essence formula adopt the existing technical conditions.

The plant fiber is 13-wt% of bamboo fiber and the rest is mulberry bark fiber.

In S1, the water pressure of the first water jet operation is 1.6-1.8MPa.

In S2, the water pressure of the second water jet operation is 4.5-5.0MPa.

S3, the speed of the mesh fabric intermediate body relative to the flat plate type electric heater is 2.2cm/S.

In S4, the water pressure of the third water jet operation is 10.0-11.0MPa.

Example 3

A non-woven flushable dry towel comprises 75wt% of plant fibers, 6.7wt% of viscose fibers and the balance of acetate fibers. The dry towel soaking essence is a non-woven flushable wet towel, and the soaking process and the essence formula adopt the existing technical conditions.

The plant fiber is 12.5wt% of bamboo fiber and the rest is mulberry bark fiber.

In S1, the water pressure of the first water jet operation is 2.0-2.2MPa.

In S2, the water pressure of the second water jet operation is 6.0-6.5MPa.

S3, the speed of the mesh fabric intermediate body relative to the flat plate type electric heater is 3.0cm/S.

In S4, the water pressure of the third water jet operation is 11.0-12.0MPa.

Comparative example 1

The dry/wet wipe product of this comparative example, its fibrous raw material formulation and method of manufacture, differs from example 1 in only one of the following points:

the dry towel is composed of 80wt% of plant fibers, 4wt% of viscose fibers and the balance of acetate fibers.

Comparative example 2

The dry/wet wipe product of this comparative example, its fibrous raw material formulation and method of manufacture, differs from example 2 in only one of the following points:

the hydroentanglement reinforcement process in this comparative example is free of S3, i.e., no heat melt cure operation.

Comparative example 3

The dry/wet wipe product of this comparative example, its fibrous raw material formulation and method of manufacture, differs from example 3 in only one of the following points:

the four-time hydraulic needling operation process common in the prior art is adopted in the hydraulic needling reinforcement process in the comparative example, for example, the first hydraulic needling pressure is 1.5-2.2MPa, the second hydraulic needling pressure is 4.5-7.0MPa, the third hydraulic needling pressure is 8.0-9.0MPa, and the fourth hydraulic needling pressure is 10.0-12.5MPa.

The embodiments of the present invention have been described in detail with reference to the drawings, but the present invention is not limited to the above embodiments, and various modifications may be made within the knowledge of those skilled in the art without departing from the spirit of the present invention. These are all non-inventive modifications which are intended to be protected by the patent laws within the scope of the appended claims.

Claims

1. A nonwoven flushable dry/wet wipe made from the dry wipe wet concentrate, characterized in that: the raw materials of the dry towel comprise 72-76wt% of plant fiber, 6-18wt% of viscose fiber and the rest acetate fiber,

the production method of the dry towel sequentially comprises slurry stirring, wet-process net forming and water jet reinforcement, and the water jet reinforcement process sequentially comprises the following steps:

2. A nonwoven flushable dry/wet wipe according to claim 1, wherein: the plant fiber is 10-13% wt% of bamboo fiber and the rest is mulberry bark fiber.

3. A nonwoven flushable dry/wet wipe according to claim 2, wherein: when the proportion of the bamboo fibers in the plant fibers is less than or equal to 12 wt%, the proportion of the viscose fibers in the fiber raw materials is more than or equal to 16 wt%;

4. A nonwoven flushable dry/wet wipe according to claim 1, wherein: in S1, the water pressure of the first water jet operation is 1.5-2.2MPa.

5. A nonwoven flushable dry/wet wipe according to claim 1, wherein: in S2, the water pressure of the second water jet operation is 4.5-7.0MPa.

6. A nonwoven flushable dry/wet wipe according to claim 1, wherein: in the S3, the heating, melting and solidifying operation is completed by adopting a flat-plate electric heater, the two flat-plate electric heaters are respectively arranged on two vertical inner sides of the rectangular frame body, the mesh fabric intermediate body passes through the rectangular frame body, and the short side direction is vertical.

7. A nonwoven flushable dry/wet wipe according to claim 6, wherein: s3, in the rectangular frame body, the temperature is less than or equal to 240 ℃ within the range of 2cm at each side of the middle body of the mesh cloth.

8. A nonwoven flushable dry/wet wipe according to claim 7, wherein: in S3, the speed of the mesh fabric intermediate body relative to the flat plate type electric heater is 1.5-3.5cm/S.

9. A nonwoven flushable dry/wet wipe according to claim 1, wherein: in S4, the water pressure of the third water jet operation is 10.0-12.5MPa.