CN114249913A - Breathable film with air permeability distributed in segmented mode and preparation method thereof - Google Patents
Breathable film with air permeability distributed in segmented mode and preparation method thereof Download PDFInfo
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- CN114249913A CN114249913A CN202111646126.2A CN202111646126A CN114249913A CN 114249913 A CN114249913 A CN 114249913A CN 202111646126 A CN202111646126 A CN 202111646126A CN 114249913 A CN114249913 A CN 114249913A
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- breathable film
- breathable
- air permeability
- film
- stretching
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D7/00—Producing flat articles, e.g. films or sheets
- B29D7/01—Films or sheets
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2300/00—Characterised by the use of unspecified polymers
Abstract
The invention discloses a breathable film with air permeability distributed in sections and a preparation method thereof. The breathable film is a blown film, and the breathable film is integrally provided with a low air permeability area and a high air permeability area. The breathable films with different air permeability can be prepared according to the needs, so that the breathable amount of a local area of the absorbing article is larger, and the breathable amount of other areas is extremely small; therefore, the air permeability of different areas of the air permeable membrane can be adjusted according to needs, so that the use comfort of the sanitary ware is improved.
Description
Technical Field
The invention relates to a breathable film with air permeability distributed in sections and a preparation method thereof.
Background
The breathable film is widely applied to sanitary products such as sanitary towels/paper diapers and the like as a bottom film, and the main stretching preparation process of the breathable film comprises cast film stretching and blown film stretching, and has the characteristics of water resistance and vapor permeability. Due to the limitation of the existing preparation process, the air permeability of the breathable film in the whole width range is basically consistent during production. However, in the use process of the breathable film, due to the particularity of the human body structure, after body fluid is discharged, the breathable amount of a local area of the absorption article is often larger, and the breathable amount of other areas is very small; and conventional ventilated membrane is in order to compromise hydrostatic pressure and physical and mechanical properties etc. for the whole ventilative volume of ventilated membrane is on the low side, greatly influences the health products and uses the travelling comfort.
Disclosure of Invention
In order to overcome the defects, the invention aims to provide a breathable film with air permeability distributed in a segmented manner for hygienic products and a preparation method thereof.
In order to achieve the purpose, the breathable film with the air permeability distributed in a segmented mode is a breathable film, and the breathable film integrally comprises a low air permeability area and a high air permeability area.
Further, the high air permeability area is continuously or discontinuously and integrally arranged in the low air permeability area.
In order to achieve the above object, the present invention provides a method for preparing a breathable film with a segmented distribution of air permeability, comprising the steps of:
preparing a master batch with low air permeability and a master batch with high air permeability;
and respectively extruding the master batch with low air permeability and the master batch with high air permeability through different screw extruders through one die orifice simultaneously.
In order to achieve the above object, the method for preparing the breathable film with segmented air permeability distribution of the present invention comprises: and adjusting the gap of the discharge die so that the thickness of the breathable film in the low air permeability area is larger than that of the breathable film in the high air permeability area.
In order to achieve the above object, the method for preparing a breathable film with a segmented distribution of air permeability according to the present invention comprises at least a stretching step, wherein the stretching step comprises at least: and stretching the film-blowing breathable film in the stretching step by adopting a pulsating stretching force so as to form a low air permeability area and a high air permeability area which are arranged at intervals on the film-blowing breathable film.
In order to achieve the above object, the method for producing a breathable film having a segmented distribution of air permeability according to the present invention at least comprises a stretching step of heating the breathable film in the stretching step at intervals to form a low air permeability region and a high air permeability region at intervals in the breathable film.
The breathable films with different air permeability can be prepared according to the needs, so that the breathable amount of a local area of the absorbing article is larger, and the breathable amount of other areas is extremely small; therefore, the air permeability of different areas of the air permeable membrane can be adjusted according to needs, so that the use comfort of the sanitary ware is improved.
Drawings
FIG. 1 is a schematic structural view of a breathable film of example 1 of the present invention.
FIG. 2 is a schematic structural view of a breathable film of example 2 of the present invention.
FIG. 3 is a schematic structural view of a breathable film of example 3 of the present invention.
FIG. 4 is a schematic structural view of a breathable film of example 4 of the present invention.
FIG. 5 is a schematic structural view of a breathable film of example 5 of the present invention.
FIG. 6 is a schematic structural view of a breathable film of example 6 of the present invention.
FIG. 7 is a schematic view of a multi-screw extruder arrangement.
FIG. 8 is another schematic view of a multiple screw extruder arrangement.
Detailed Description
The invention will be further described with reference to the accompanying drawings.
FIG. 1 is a schematic structural view showing an embodiment of the breathable film of the present invention, wherein a low air permeability region 2 is located between a high air permeability region 1, and the high air permeability region 1 of the breathable film is continuous along the length direction.
FIG. 2 is a schematic structural view of another embodiment of the breathable film of the present invention, in this embodiment, two regions with high air permeability 1 are provided at intervals on the breathable film, and the regions with high air permeability 1 in the breathable film are continuous along the length direction.
FIG. 3 is a schematic structural view of a further embodiment of the breathable film of the present invention, wherein the low permeability region 2 is located between the high permeability region 1, and the high permeability region 1 of the breathable film is discontinuous along its length.
FIG. 4 is a schematic structural view of another embodiment of the breathable film of the present invention, in this embodiment, two regions with high air permeability 1 are disposed at intervals on the breathable film, and the regions with high air permeability 1 in the breathable film are discontinuous along the length direction.
The breathable films can be similarly deformed to meet different requirements of different users, and are not listed here.
The preparation method of the breathable film with the air permeability distributed in sections comprises the following steps:
preparing a master batch with low air permeability and a master batch with high air permeability;
and respectively extruding the master batch with low air permeability and the master batch with high air permeability through different screw extruders through one die orifice simultaneously. As shown in fig. 7 and 8, it comprises two or more annularly arranged screw extruders in which a screw extruder charged with a low air permeability mother material and a screw extruder charged with a high air permeability mother material are alternately arranged; a plurality of screw extruders are extruded through a die orifice to form a film; the method can be used to make the embodiments shown in fig. 1 and 2.
The embodiments shown in fig. 3 and 4 can also be made using a multi-layer extrusion mechanism using the above-described directions; the embodiment shown in fig. 3 will now be described as an example. When the embodiment shown in FIG. 3 is manufactured, four screw extruders with the same die opening are used for extrusion, wherein two screw extruders are filled with master batch with low air permeability; and the middle adopts a two-layer screw extruder, wherein one layer is filled with high-permeability master batch, and the other layer is filled with low-permeability master batch. The embodiment shown in fig. 3 can be realized by controlling the two screw extruders in the middle to work alternately at different time periods during production.
As a variation, the method for preparing the breathable film with segmented air permeability distribution according to the present invention may further comprise: and adjusting the gap of the discharge die so that the thickness of the breathable film in the low air permeability area is larger than that of the breathable film in the high air permeability area.
The embodiment shown in fig. 1 will now be described as an example. When the embodiment shown in the figure 1 is manufactured, the gaps at the two sides of the discharging die are adjusted to be larger, and/or the gap at the middle discharging die is reduced, so that the thicknesses (gram weight) of the two sides of the breathable film are larger than the thickness (gram weight) of the middle of the breathable film, and the breathable amounts at the two sides of the breathable film are smaller than the breathable amount of the middle of the breathable film.
Preparation method 3
The preparation method of the breathable film with the air permeability distributed in sections also comprises the following steps: the preparation method of the blown film breathable film at least comprises a stretching step, and the stretching step at least comprises the following steps: and stretching the film-blowing breathable film in the stretching step by adopting a pulsating stretching force so as to form a low air permeability area and a high air permeability area which are arranged at intervals on the film-blowing breathable film.
The pulsating tensile force will now be described by way of example:
example 1: placing the film-blowing breathable film in a front stretching roller, a rear stretching roller and a winding roller for stretching, wherein the rotation speed of the middle stretching roller is increased in a pulsating mode, for example, the rotation speed of the rear stretching roller is repeatedly increased to 1.1-1.3 times that of the front stretching roller in the time of 0.1-0.5 seconds; this corresponds to increasing the stretching force of the section of the film-blowing breathable film between the front stretching roller and the rear stretching roller in a shorter time, so that the ventilation amount of the section of the film-blowing breathable film is increased relative to the section of the film-blowing breathable film which is not accelerated. Thus forming a breathable film similar to that of fig. 5, even though the low air permeability regions 2 and the high air permeability regions 1 alternate. Thus, the interval between the front stretching roller and the rear stretching roller and the time of the accelerating speed are adjusted, and the preset film-blowing breathable film can be achieved.
Example 2, as a modification of example 1, a top roll may be provided between the front stretching roll and the rear stretching roll, and a similar effect may be produced by blowing the breathable film segment between the front stretching roll and the rear stretching roll by the pulsating top roll.
Example 3, as a modification of example 1, the diameter of the stretching roll after the pulsation adjustment can also produce a similar effect.
Preparation method 4
The preparation method of the breathable film with the air permeability distributed in sections also comprises the following steps: and heating the film-blowing breathable film in the stretching step at intervals in the stretching step so as to form a low air permeability area and a high air permeability area which are arranged at intervals in the film-blowing breathable film. Namely, a tubular heating device is transversely arranged on the film-blowing breathable film in the stretching step, and the heating device is heated and cooled at intervals, so that the air permeability of the film-blowing breathable film section of the heating part is reduced, while the air permeability of the film-blowing breathable film section which is not heated is unchanged, thereby forming the breathable film similar to the breathable film shown in figure 5, even if the low air permeability region 2 and the high air permeability region 1 alternately appear.
Preparation method 5
As a further improvement of the present invention, the method of production method 1, 2 or 3 may be combined with production method 4 to form a new form of blown film breathable film, as shown in fig. 6.
Claims (8)
1. The breathable film is characterized in that the breathable film is a blown film, and a low breathable area and a high breathable area are integrally formed on the breathable film.
2. The breathable film of claim 1, wherein the high permeability regions are integrally disposed in the low permeability regions continuously or intermittently.
3. The method of making a breathable, segmented distribution film-blowing film breathable film of claim 1, comprising the steps of:
preparing a master batch with low air permeability and a master batch with high air permeability;
and respectively extruding the master batch with low air permeability and the master batch with high air permeability by using different screw extruders through a die orifice in an alternating arrangement mode.
4. A method for preparing the breathable film of claim 1, wherein the method comprises: and adjusting the gap of the discharge die so that the thickness of the breathable film in the low air permeability area is larger than that of the breathable film in the high air permeability area.
5. A method for preparing a breathable film according to claim 1, wherein said method for preparing a breathable film comprises at least a stretching step, and said stretching step comprises at least: and stretching the film-blowing breathable film in the stretching step by adopting a pulsating stretching force so as to form a low air permeability area and a high air permeability area which are arranged at intervals on the film-blowing breathable film.
6. The method for preparing a breathable film according to claim 1, wherein the method for preparing a breathable film comprises at least a stretching step, wherein the breathable film is heated at intervals in the stretching step, so that the breathable film forms a low-breathable region and a high-breathable region at intervals.
7. The method for preparing a breathable film according to claim 3 or 4, wherein the method for preparing a breathable film comprises at least a stretching step, and the stretching step comprises at least: and stretching the film-blowing breathable film in the stretching step by adopting a pulsating stretching force so as to form a low air permeability area and a high air permeability area which are arranged at intervals on the film-blowing breathable film.
8. The method for producing a breathable film according to claim 3 or 4, wherein the method for producing a breathable film comprises at least a stretching step in which the breathable film is heated at intervals in the stretching step to form a low-breathable region and a high-breathable region at intervals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111646126.2A CN114249913A (en) | 2021-12-30 | 2021-12-30 | Breathable film with air permeability distributed in segmented mode and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111646126.2A CN114249913A (en) | 2021-12-30 | 2021-12-30 | Breathable film with air permeability distributed in segmented mode and preparation method thereof |
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| CN114249913A true CN114249913A (en) | 2022-03-29 |
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| CN202111646126.2A Pending CN114249913A (en) | 2021-12-30 | 2021-12-30 | Breathable film with air permeability distributed in segmented mode and preparation method thereof |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007081548A2 (en) * | 2006-01-06 | 2007-07-19 | Pliant Corporation | Method of stretching a filled film to make it microporous and breathable |
| CN209437510U (en) * | 2018-10-19 | 2019-09-27 | 韩顺(厦门)卫生用品有限公司 | A kind of composite ventilating counterdie |
| CN211131731U (en) * | 2019-09-17 | 2020-07-31 | 常州唯尔福卫生用品有限公司 | Air permeable cast film |
| CN112143076A (en) * | 2020-09-24 | 2020-12-29 | 浙江大汇新材料有限公司 | Visible antibacterial breathable antifogging film and preparation method thereof |
| CN112708190A (en) * | 2020-12-17 | 2021-04-27 | 金发科技股份有限公司 | Breathable film composition special for warm patch and preparation method and application thereof |
| CN112778606A (en) * | 2020-12-31 | 2021-05-11 | 福建恒安集团有限公司 | Partitioned breathable base film, preparation method thereof and paper diaper |
| CN213310932U (en) * | 2020-08-07 | 2021-06-01 | 福建琦峰科技有限公司 | Breathable film with good breathability for hygienic products |
-
2021
- 2021-12-30 CN CN202111646126.2A patent/CN114249913A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007081548A2 (en) * | 2006-01-06 | 2007-07-19 | Pliant Corporation | Method of stretching a filled film to make it microporous and breathable |
| CN209437510U (en) * | 2018-10-19 | 2019-09-27 | 韩顺(厦门)卫生用品有限公司 | A kind of composite ventilating counterdie |
| CN211131731U (en) * | 2019-09-17 | 2020-07-31 | 常州唯尔福卫生用品有限公司 | Air permeable cast film |
| CN213310932U (en) * | 2020-08-07 | 2021-06-01 | 福建琦峰科技有限公司 | Breathable film with good breathability for hygienic products |
| CN112143076A (en) * | 2020-09-24 | 2020-12-29 | 浙江大汇新材料有限公司 | Visible antibacterial breathable antifogging film and preparation method thereof |
| CN112708190A (en) * | 2020-12-17 | 2021-04-27 | 金发科技股份有限公司 | Breathable film composition special for warm patch and preparation method and application thereof |
| CN112778606A (en) * | 2020-12-31 | 2021-05-11 | 福建恒安集团有限公司 | Partitioned breathable base film, preparation method thereof and paper diaper |
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