WO2022183692A1

WO2022183692A1 - New-type elastic waistband non-woven fabric and process for forming same

Info

Publication number: WO2022183692A1
Application number: PCT/CN2021/113386
Authority: WO
Inventors: 林笛
Original assignee: 泉州市汉威机械制造有限公司
Priority date: 2021-03-03
Filing date: 2021-08-19
Publication date: 2022-09-09
Also published as: CN113017991A

Abstract

A new-type elastic waistband non-woven fabric. The new-type elastic waistband non-woven fabric comprises an upper elastic non-woven fabric (1), a lower elastic non-woven fabric (2) and an elastic element (3) sandwiched therebetween, wherein the upper elastic non-woven fabric (1) is provided with a wave-shaped structure with upper wave crest portions (11) and upper wave trough portions (12) arranged alternately in the thickness direction of the upper elastic non-woven fabric; the lower elastic non-woven fabric (2) is provided with a wave-shaped structure with lower wave crest portions (21) and lower wave trough portions (22) arranged alternately in the thickness direction of the lower elastic non-woven fabric; and when the elastic element (3) is in a natural state of zero tension, the elastic element (3) is combined with the upper wave trough portions (12) and the lower wave crest portions (21), the combination positions of the upper wave trough portions (12) correspond to those of the lower wave crest portions (21), and the upper wave crest portions (11) and the lower wave trough portions (22) do not come into contact with the elastic element (3).

Description

A new type of elastic waist non-woven fabric and its forming process

technical field

The invention relates to the field of raw materials for the production of sanitary products, in particular to a novel elastic waistline nonwoven fabric and a molding process thereof.

Background technique

There are two commonly used elastic waist styles for baby training pants, women's safety pants, and adult pull-up pants on the market. One is compounded by adding elastic bands between the upper and lower layers of non-woven fabrics. It is an elastic waist material compounded by a layer of non-woven fabrics and rubber bands. Generally, 15-30 elastic bands with a thickness of about 420d-620d are distributed between the two layers of non-woven fabrics. This form of elastic waistline is easy to produce due to the thicker rubber bands. Streak marks, uncomfortable to wear; and one is an elastic film material, which has a certain elasticity after being stretched and activated, so it is used in the production of elastic waistlines. However, its stretching ratio is limited, and its elasticity is far less than the elastic waist made by rubber bands. Moreover, the price of elastic film material is high, and its application in products will lead to an increase in its cost. At the same time, the elastic film material has poor air permeability, which can lead to uncomfortable wearing.

SUMMARY OF THE INVENTION

Therefore, the present invention provides a novel elastic waist non-woven fabric and a molding process thereof, which solves the problem that the existing elastic waist non-woven fabric lacks comfort.

To achieve the above object, the present invention is achieved through the following technical solutions:

A new type of elastic waist non-woven fabric includes an upper layer elastic non-woven fabric, a lower layer elastic non-woven fabric and an elastic element sandwiched between the two. The upper layer elastic non-woven fabric has staggered upper layers along its thickness direction. The wavy line structure of the crest part and the upper trough part, the lower elastic non-woven fabric has a wavy line structure with staggered lower crest part and lower trough part along its thickness direction, when the elastic element is zero tension In the natural state, the elastic element is combined on the upper layer trough part and the lower layer wave crest part; They are not in contact with the elastic element, the elastic element is composed of 100-400 elastic bands arranged in parallel, and the diameter of the elastic band is between 50d-200d.

Preferably, the elastic element is composed of two or more elastic bands with different stretch ratios, and is arranged in sequence along the width direction of the upper elastic non-woven fabric and the lower elastic non-woven fabric with increasing or decreasing stretch ratios, Form more than two elastic regions with different stretch ratios.

Preferably, the stretch ratio of the upper layer elastic non-woven fabric, the lower layer elastic non-woven fabric and the elastic element after compounding is any value between 1-5 times.

Preferably, the width of the upper elastic non-woven fabric and the lower elastic non-woven fabric is 100mm-200mm.

Preferably, the width of the upper elastic non-woven fabric and the lower elastic non-woven fabric is 150 mm.

A molding process of a novel elastic waist non-woven fabric is characterized in that, comprises the following steps:

1. Take two groups of elastic non-woven fabrics and arrange them in an assembly line. After being formed by a tooth-shaped meshing forming mechanism, the upper layer elastic non-woven fabric and the lower layer elastic non-woven fabric are respectively formed, and continue to be transported forward;

2. Between the upper elastic non-woven fabric and the lower elastic non-woven fabric, add a plurality of elastics evenly distributed along the width direction of the two, and spray glue on the elastics, the elastics are 50d-200d Size 100-400 parallel set;

3. Hot melt adhesive is arranged between the upper elastic non-woven fabric and the elastic band, and the elastic band and the lower elastic non-woven fabric are bonded to form the new elastic waist non-woven fabric.

Preferably, the elastic bands have two or more different stretch ratios, and are sequentially arranged in a manner of increasing or decreasing stretch ratios along the width direction of the upper elastic non-woven fabric and the lower elastic non-woven fabric to form more than two stretch ratios. Elastic range for different stretch ratios.

Preferably, the meshing forming mechanism includes a forming roller set for forming the upper elastic non-woven fabric and the lower elastic non-woven fabric and a guide roller set for guiding, and the forming roller set includes a convex roller and a concave roller, so The outer surface of the concave roller is evenly distributed with forming grooves, the outer surface of the convex roller is provided with a forming boss adapted to the forming groove, and the width of the forming groove is larger than the width of the forming boss.

Preferably, the meshing and forming mechanism further comprises a water mist nozzle arranged in front of the forming roller set for increasing the humidity of the non-woven fabric, and a hot air drying device set after the forming roller set for setting the shape.

Preferably, the above-mentioned step 3 can also be performed by ultrasonic welding or heat pressing the upper elastic non-woven fabric, elastic band and lower elastic non-woven fabric to form the new elastic waist non-woven fabric.

By adopting the foregoing technical scheme, the beneficial effects of the present invention are:

The product structure adopted in the present invention is different from the previous product structure. The upper layer elastic non-woven fabric and the lower layer elastic non-woven fabric are both wavy line cross-section structures, and elastic elements are sandwiched between the upper layer trough and the lower wave crest to form a three-dimensional gap The structure of the elastic waist can better retain the softness and air permeability of the non-woven material, and it is not easy to cause streaks to the user, and has good comfort in use. The advantages of waist material can also abandon its existing disadvantages;

In production, the two layers of non-woven fabrics are first meshed and formed to form a wavy line structure, and then the two are compounded with rubber bands. The forming process is simple and can accurately meet the production requirements. It is also easy to rectify existing equipment and reduce Equipment investment, reduce production costs.

Description of drawings

FIG. 1 is a schematic structural diagram in the thickness direction of Embodiment 1 of the present invention;

2 is a schematic structural diagram of a plane direction according to Embodiment 1 of the present invention;

3 is a schematic structural diagram of an engaging molding mechanism according to an embodiment of the present invention;

FIG. 4 is a schematic structural diagram in the thickness direction of Embodiment 2 of the present invention.

Detailed ways

The embodiments of the present invention will be described in detail below with reference to specific examples, so as to fully understand and implement the implementation process of how the present invention applies technical means to solve technical problems and achieve technical effects.

Example 1

1 and 2, a new type of elastic waist non-woven fabric includes an upper layer elastic non-woven fabric 1, a lower layer elastic non-woven fabric 2 and an elastic element 3 sandwiched between the two, the upper layer elastic non-woven fabric 1. It has a wavy line-like structure with staggered upper wave crests 11 and upper wave troughs 12 along its thickness direction, and the lower elastic non-woven fabric 2 has staggered lower wave crests 21 and lower wave troughs along its thickness direction. 22 of the wavy line structure, when the elastic element 3 is in a natural state of zero tension, the elastic element 3 is compounded on the upper trough 12 and the lower crest 21, and the upper trough 12 and the lower The composite positions of the wave crest portions 21 correspond to each other, and each of the upper wave crest portions 11 and each of the lower wave trough portions 22 are not in contact with the elastic element 3; It should be pointed out that the composite can also be carried out in the form of ultrasonic welding or hot pressing; the product structure used in this embodiment is different from the previous product structure, the upper elastic non-woven fabric and the lower elastic non-woven fabric are both wavy The structure of the line cross-section, the upper wave trough and the lower wave crest are sandwiched with elastic elements to form a structure with three-dimensional gaps, which can make the elastic waist better retain the softness and air permeability of the non-woven material, and it is not easy for users. Scratch marks, with good use comfort;

Specifically, as shown in FIG. 2 , the elastic element 3 is composed of three elastic bands with different stretch ratios arranged in parallel, and stretched along the width direction of the upper elastic non-woven fabric 1 and the lower elastic non-woven fabric 2 The ways of increasing or decreasing the elongation are set in sequence to form three elastic ranges of A, B and C with different stretching ratios. Among them, the elasticity of the A area is the largest. When in use, the A area is located close to the position of the pants head of the absorbent article. This position A larger stretch ratio is required to prevent the absorbent article from sliding down due to the user's activities during wearing; while the elastic bands with a stretch ratio smaller than that of the A zone are selected in the B and C areas, which can reduce the elasticity of the absorbent article below the trousers, and further It avoids a large pulling force on the corresponding position, ensures the close fit, and also avoids streaks caused by excessive elasticity, and improves the comfort when wearing.

In this embodiment, the elastic element 3 is composed of 400 elastic bands. Specifically, the diameter of the elastic band is 50d. In this structure, compared with the 420d-620d used in the products on the market, the single elastic band is thinner, so the number of choices is larger. Choosing more elastic bands within the same width range can not only ensure the elastic element 3 elasticity, and can also better disperse the elasticity, the user is more comfortable when wearing, and can further reduce the occurrence of streaks;

Moreover, according to different products, the number of rubber bands can be selected from 100-400, and the diameter can be selected between 50d-200d, so that suitable elastic waist non-woven fabrics can be designed for different users;

According to the above settings, the stretch ratio of the upper layer elastic non-woven fabric 1, the lower layer elastic non-woven fabric 2 and the elastic element 3 in this embodiment is 1. Also according to production requirements, the specifications and number of elastic bands can be adjusted to make the stretching Any value between 1 and 5 times the elongation ratio can be used.

In this embodiment, the width of the upper elastic non-woven fabric 1 and the lower elastic non-woven fabric 2 selected for use is 150 mm. Also according to different products, the width of the upper elastic non-woven fabric 1 and the lower elastic non-woven fabric 2 can be 100mm-200mm.

At the same time, this scheme discloses a molding process of a novel elastic waist non-woven fabric, which includes the following steps:

Referring specifically to FIG. 3 , the meshing forming mechanism includes a forming roller set 4 for forming the upper elastic non-woven fabric and the lower elastic non-woven fabric and several guide roller sets 5 for guiding, and the forming roller set 5 includes convex rollers 41 and the concave roller 42, the outer surface of the concave roller 42 is evenly distributed with forming grooves 421, and the outer surface of the convex roller 41 is provided with a forming boss 411 adapted to the forming groove 421. The width of the groove 421 is larger than the width of the forming boss 411 . During molding, the elastic non-woven fabric enters between the convex roller 41 and the concave roller 42, and is deformed by the combined action of the forming boss 411 and the forming groove 421 to form a continuous wavy line structure; The width is set larger, and the gap between the molding boss 411 and the molding groove 421 provides a buffer space for the deformation of the elastic non-woven fabric during production, and avoids the rupture of the elastic non-woven fabric due to the rigid structure of the two. It also reduces the installation difficulty and processing difficulty of the equipment;

In this embodiment, in order to improve the shaping effect after molding, a heating tube 43 can be embedded in the bottom of the molding groove 421 or in the molding boss 411, and a certain amount of heat can be applied after the elastic non-woven fabric is deformed to prevent it from occurring. Partial retraction after forming can have better forming effect;

In this embodiment, the meshing forming mechanism further includes a water mist nozzle 6 arranged in front of the forming roller group 4 for improving the humidity of the elastic non-woven fabric, and a water mist nozzle 6 disposed behind the forming roller group 4 for shaping Hot air drying device 7. The water mist nozzle 6 and the subsequent hot air drying device 7 are arranged to increase the humidity of the elastic non-woven fabric before forming, and after the deformation is dried by hot air, it is more conducive to setting and improving the forming efficiency and effect.

It should be noted that the above-mentioned step 3 can also be performed by ultrasonic welding or thermocompression bonding of the upper elastic non-woven fabric, elastic band and lower elastic non-woven fabric to form the new elastic waist non-woven fabric.

At the same time, in production, the rubber band can have a certain tension or no tension state before compounding; this embodiment adopts a tension-free state for production; and in the case of a certain tension, the rubber band will be formed after the cutting is completed. The latter elastic non-woven product forms a further shrinking effect, increases the deformation amount of the upper elastic non-woven fabric and the lower elastic non-woven fabric, and also provides greater elasticity.

Embodiment 2

As shown in FIG. 4 , compared with the first embodiment, it is another product structure that can realize the application scheme of the present invention. During production, the elastic element 3 is in a state of certain tension, and the upper elastic non-woven fabric 1 is in a state of tension. Spray glue with the sandwiching surface of the lower elastic non-woven fabric 2 to sandwich and adhere the elastic element 3. After the finished product, when the elastic element 3 is in a natural state of zero tension, each of the upper wave crest portions 11 and The lower-layer crest part 21 , the upper-layer trough part 12 correspond to the composite position of the lower-layer trough part 22 . This is another production method of this scheme, only the production method is different, and the corresponding technical effect can also be achieved.

It should be pointed out that the compounding in this embodiment is in the form of sizing and bonding, and the compounding may also be performed in the form of ultrasonic welding or hot pressing.

Although the present invention has been particularly shown and described in connection with preferred embodiments, it will be understood by those skilled in the art that changes in form and detail may be made to the present invention without departing from the spirit and scope of the invention as defined by the appended claims. Various changes are made within the protection scope of the present invention.

Claims

A new type of elastic waist non-woven fabric is characterized in that it comprises an upper layer elastic non-woven fabric, a lower layer elastic non-woven fabric and an elastic element sandwiched therebetween, and the upper layer elastic non-woven fabric has a thickness along its thickness direction. The wavy line-like structure of the crest part of the upper layer and the trough part of the upper layer are staggered, and the elastic non-woven fabric of the lower layer has a wavy line-like structure with the crest part of the lower layer and the trough part of the lower layer along the thickness direction. In the natural state of zero tension, the elastic element is combined on the upper wave trough and the lower wave crest. The lower wave troughs are not in contact with the elastic element, the elastic element is composed of 100-400 elastics arranged in parallel, and the diameter of the elastics is between 50d-200d.
The new elastic waist non-woven fabric according to claim 1 is characterized in that: the elastic element is composed of two or more elastic bands with different elongation rates, and the elastic non-woven fabric of the upper layer and the elastic non-woven fabric of the lower layer are composed of two or more elastic bands. The width direction of the stretcher is set in sequence in the manner of increasing or decreasing stretching ratio, forming two or more elastic zones with different stretching ratios.
The new elastic waist non-woven fabric according to claim 2 is characterized in that: the stretch ratio of the upper layer elastic non-woven fabric, the lower layer elastic non-woven fabric and the elastic element after compounding is any value between 1-5 times .
The new elastic waist non-woven fabric according to claim 1, 2 or 3, wherein the width of the upper elastic non-woven fabric and the lower elastic non-woven fabric is 100mm-200mm.
The new elastic waist non-woven fabric according to claim 4, wherein the width of the upper elastic non-woven fabric and the lower elastic non-woven fabric is 150 mm.
A molding process of the novel elastic waist non-woven fabric according to claim 1, characterized in that, comprising the following steps:

1. Take two groups of elastic non-woven fabrics and arrange them in an assembly line. After being formed by a tooth-shaped meshing forming mechanism, the upper layer elastic non-woven fabric and the lower layer elastic non-woven fabric are respectively formed, and continue to be transported forward;

2. Between the upper elastic non-woven fabric and the lower elastic non-woven fabric, add a plurality of elastics evenly distributed along the width direction of the two, and spray glue on the elastics, the elastics are 50d-200d Size 100-400 parallel set;

3. Hot melt adhesive is arranged between the upper elastic non-woven fabric and the elastic band, and the elastic band and the lower elastic non-woven fabric are bonded to form the new elastic waist non-woven fabric.
The molding process of the new elastic waist non-woven fabric according to claim 6, wherein the elastic band has two or more different stretch rates, and the elastic non-woven fabric of the upper layer and the elastic non-woven fabric of the lower layer are formed along the line of the upper elastic non-woven fabric and the lower elastic non-woven fabric. In the width direction, the stretching ratio is increased or decreased in sequence, so as to form two or more elastic regions with different stretching ratios.
The molding process of the new elastic waist non-woven fabric according to claim 7, wherein the meshing molding mechanism comprises a forming roller set for forming the upper elastic non-woven fabric and the lower elastic non-woven fabric, and a guiding roller set. Guide roller set, the forming roller set includes convex rollers and concave rollers, the outer surface of the concave rollers is evenly distributed with forming grooves, and the outer surface of the convex rollers is provided with forming bosses adapted to the forming grooves , the width of the forming groove is greater than the width of the forming boss.
The molding process of the new elastic waist non-woven fabric according to claim 8, wherein the meshing molding mechanism further comprises a water mist nozzle arranged in front of the molding roller set for increasing the humidity of the non-woven fabric, and A hot air drying device for shaping after the forming roller set.
The molding process of the new elastic waist non-woven fabric according to any one of claims 6-9, characterized in that: the above-mentioned step 3 can also be the process of forming the upper elastic non-woven fabric, elastic band and lower elastic non-woven fabric. The woven fabric is ultrasonically welded or thermally pressed to form the new elastic waist non-woven fabric.