CN116035259A - Preparation method of polylactic acid fiber hollow filter stick - Google Patents
Preparation method of polylactic acid fiber hollow filter stick Download PDFInfo
- Publication number
- CN116035259A CN116035259A CN202310161156.7A CN202310161156A CN116035259A CN 116035259 A CN116035259 A CN 116035259A CN 202310161156 A CN202310161156 A CN 202310161156A CN 116035259 A CN116035259 A CN 116035259A
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- CN
- China
- Prior art keywords
- polylactic acid
- acid fiber
- filter stick
- hollow filter
- tows
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 229920000747 poly(lactic acid) Polymers 0.000 title claims abstract description 95
- 239000004626 polylactic acid Substances 0.000 title claims abstract description 95
- 239000000835 fiber Substances 0.000 title claims abstract description 62
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- 238000010438 heat treatment Methods 0.000 claims abstract description 24
- URAYPUMNDPQOKB-UHFFFAOYSA-N triacetin Chemical compound CC(=O)OCC(OC(C)=O)COC(C)=O URAYPUMNDPQOKB-UHFFFAOYSA-N 0.000 claims description 22
- 238000000034 method Methods 0.000 claims description 19
- 235000013773 glyceryl triacetate Nutrition 0.000 claims description 11
- 239000001087 glyceryl triacetate Substances 0.000 claims description 11
- 229960002622 triacetin Drugs 0.000 claims description 11
- 235000006040 Prunus persica var persica Nutrition 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 240000006413 Prunus persica var. persica Species 0.000 claims 1
- 238000000465 moulding Methods 0.000 abstract description 19
- 230000000694 effects Effects 0.000 abstract description 9
- 238000007711 solidification Methods 0.000 abstract description 4
- 230000008023 solidification Effects 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 description 18
- 229920006221 acetate fiber Polymers 0.000 description 6
- 235000019504 cigarettes Nutrition 0.000 description 5
- 238000001816 cooling Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 244000144730 Amygdalus persica Species 0.000 description 2
- 241000208125 Nicotiana Species 0.000 description 2
- 235000002637 Nicotiana tabacum Nutrition 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 2
- 229920003232 aliphatic polyester Polymers 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 238000005485 electric heating Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 230000009477 glass transition Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 229920001169 thermoplastic Polymers 0.000 description 2
- 239000004416 thermosoftening plastic Substances 0.000 description 2
- QTBSBXVTEAMEQO-UHFFFAOYSA-M Acetate Chemical compound CC([O-])=O QTBSBXVTEAMEQO-UHFFFAOYSA-M 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000000889 atomisation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000007712 rapid solidification Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 235000019505 tobacco product Nutrition 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000005491 wire drawing Methods 0.000 description 1
Images
Classifications
-
- A—HUMAN NECESSITIES
- A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
- A24D—CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES FOR CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
- A24D3/00—Tobacco smoke filters, e.g. filter-tips, filtering inserts; Filters specially adapted for simulated smoking devices; Mouthpieces for cigars or cigarettes
- A24D3/02—Manufacture of tobacco smoke filters
- A24D3/0229—Filter rod forming processes
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W90/00—Enabling technologies or technologies with a potential or indirect contribution to greenhouse gas [GHG] emissions mitigation
- Y02W90/10—Bio-packaging, e.g. packing containers made from renewable resources or bio-plastics
Landscapes
- Artificial Filaments (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention provides a preparation method of a polylactic acid fiber hollow filter stick, which relates to the technical field of hollow filter sticks and comprises the following steps: and after the polylactic acid fiber tows are opened, the polylactic acid fiber tows are sent into a forming cavity, and the polylactic acid fiber tows are heated, solidified and formed through heated air, so that the polylactic acid fiber hollow filter rod is obtained. According to the invention, the polylactic acid fiber tows are heated in a hot air heating mode, and the polylactic acid fiber hollow filter stick is obtained after solidification molding, so that the molding effect is good, the regularity is good and the pollution is low.
Description
Technical Field
The invention relates to the technical field of hollow filter sticks, in particular to a preparation method of a polylactic acid fiber hollow filter stick.
Background
With the increasing development of cigarette production technology, the types and the appearances of cigarettes are more diversified, and cigarettes with unique shapes are more popular with people, so that a novel filter stick, namely a hollow filter stick, is produced.
The production of hollow pipe (hollow) filter rods from acetate tow is a basically mature process technology, and most of the hollow pipe (hollow) filter rods are produced by rapid solidification through heating with high-temperature steam. For example, chinese patent invention CN111436650a discloses a method for preparing a hollow cooling filter stick, which comprises a tow, a cooling material and a curing agent, and is prepared by using a corresponding mold and a production process of accelerating curing by high-temperature steam on a wiredrawing hollow filter stick forming machine. The solid part outside the filter stick is of a smooth cylindrical structure, has certain elasticity and hardness, and is suitable for cigarette tipping; the inner hollow part is of a straight-through cavity structure similar to a corrugated pipe, and has good heat transfer and cooling effects when flue gas passes through the hollow part; because the filter stick is of the straight-through structure in the middle, very low suction resistance is brought, when the filter stick is used for novel tobacco, the atomization amount of the tobacco is doubled when the temperature is reduced, the experience of a smoker is met, and a novel solution is provided for improving the quality of the cigarettes and developing novel tobacco products.
Compared with acetate fiber, the polylactic acid has the advantages of low cost, easy degradation and no pollution, so the polylactic acid is very important to the preparation research of polylactic acid filter sticks at present; however, the existing process technology is quite vacant in the production of hollow pipe (hollow) filter sticks by using polylactic acid tows.
Polylactic acid PLA is thermoplastic aliphatic polyester, has low glass transition temperature, can generate rigidification and thermal collapse under high temperature conditions, and is also used for trial production of the filter rod in the initial stage of producing the hollow pipe (hollow) filter rod by using polylactic acid tows, but has the defects of too high steam temperature, poor effect, irregular shape and incapability of normal production.
Therefore, in order to solve the above problems, it is necessary to design a reasonable and efficient preparation method of the polylactic acid fiber hollow filter stick.
Disclosure of Invention
The invention aims to provide a preparation method of a polylactic acid fiber hollow filter rod, which is characterized in that a polylactic acid fiber tow is heated in a hot air heating mode, and the polylactic acid fiber hollow filter rod is obtained after solidification molding, so that the molding effect is good, the regularity is good and the pollution is low.
In order to achieve the above purpose, the invention is realized by adopting the following technical scheme:
the preparation method of the polylactic acid fiber hollow filter stick comprises the following steps:
and after the polylactic acid fiber tows are opened, the polylactic acid fiber tows are sent into a forming cavity, and the polylactic acid fiber tows are heated, solidified and formed through heated air, so that the polylactic acid fiber hollow filter rod is obtained.
Preferably, the temperature of the heated air is in the range of 65 ℃ to 85 ℃.
As the preferable mode of the invention, when the heated air enters the forming cavity, the air pump is pressurized, and the air pump is electrically connected with the temperature sensing piece in the forming cavity, and the output power of the air pump is regulated by acquiring the real-time temperature in the forming cavity, so that the temperature in the forming cavity is between 65 ℃ and 85 ℃.
In the invention, the forming cavity is internally provided with the forming inner core, and the cross section shape of the forming inner core comprises a peach heart, a five-pointed star, a circle and a plum blossom, so that the formed polylactic acid fiber hollow filter rod has a middle hole with a corresponding shape.
Preferably, the air is filtered prior to heating the air.
As a preferred aspect of the present invention, the polylactic acid tow size ranges from 60000d to 66000d.
In the present invention, two strands of polylactic acid are simultaneously opened, and each strand has a specification ranging from 30000d to 33000d.
In the present invention, the amount of glyceryl triacetate applied when the polylactic acid fiber strands are molded is preferably in the range of 12% to 16%.
The preparation method of the polylactic acid fiber hollow filter stick has the beneficial effects that: and the polylactic acid fiber tows are heated in a hot air heating mode, and the polylactic acid fiber hollow filter stick is obtained after solidification and molding, so that the molding effect is good, the regularity is good and the pollution is low.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and 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 of a preparation flow of an embodiment of a preparation method of a polylactic acid fiber hollow filter rod according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application.
In the following description, the terms "first," "second," and "first," are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The following description provides various embodiments of the present application, and various embodiments may be substituted or combined, so that the present application is also intended to encompass all possible combinations of the same and/or different embodiments described. Thus, if one embodiment includes feature A, B, C and another embodiment includes feature B, D, then the present application should also be considered to include embodiments that include one or more of all other possible combinations including A, B, C, D, although such an embodiment may not be explicitly recited in the following.
The following description provides examples and does not limit the scope, applicability, or examples set forth in the claims. Changes may be made in the function and arrangement of elements described without departing from the scope of the application. Various examples may omit, replace, or add various procedures or components as appropriate. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Furthermore, features described with respect to some examples may be combined into other examples.
Examples: referring to fig. 1, the preparation method of the polylactic acid fiber hollow filter stick of the invention comprises the following steps:
and after the polylactic acid fiber tows are opened, the polylactic acid fiber tows are sent into a forming cavity, and the polylactic acid fiber tows are heated, solidified and formed through heated air, so that the polylactic acid fiber hollow filter rod is obtained.
In the invention, the heating forming process of the acetate fiber filter stick is perfect, but the heating forming process of polylactic acid is very lack, and the polylactic acid has the advantages of low price, easy degradation and no pollution compared with the acetate fiber, so the preparation research of the polylactic acid filter stick is very important, and the invention focuses on the heating preparation of the hollow filter stick of the polylactic acid fiber.
Furthermore, the hollow acetate fiber filter stick adopts a steam heating mode, the steam temperature can reach more than 170 ℃, and the polylactic acid is thermoplastic aliphatic polyester, so that the glass transition temperature is low, and the conditions of rigidification and thermal collapse can occur under the high temperature condition, so that the preparation and molding effects of the hollow acetate fiber filter stick are extremely poor by adopting the high temperature steam heating mode.
Through multiple experiments and summaries, the temperature required by heating and preparing the polylactic acid hollow filter stick is less than 100 ℃, steam can be condensed into water, and a steam heating mode cannot be used.
Therefore, we creatively propose to directly adopt an air heating mode to prepare and mold the polylactic acid hollow filter stick, and experiments prove that the feasibility is very high, and the method specifically comprises the following steps:
the polylactic acid filter stick is prepared by heating pure air to a preset temperature, then contacting the pure air with polylactic acid fiber tows which are opened and sent into a forming unit, and heating and solidifying the polylactic acid fiber tows.
Specifically, after the polylactic acid fiber tows are opened, the molding cavity is formed, and heated air is also input into the molding cavity, so that the polylactic acid fiber tows are contacted with the hot air, the polylactic acid fiber tows are heated and solidified, and finally the polylactic acid filter stick is obtained through molding.
Since the polylactic acid hollow filter stick needs to be prepared, a forming inner core should be arranged in the forming cavity, and polylactic acid fiber tows can reach the space between the outer side of the forming inner core and the inner side of the inner side wall of the forming cavity and contact with heated air to form the polylactic acid hollow filter stick with hollow holes (the shape depends on the structure of the forming inner core).
Of course, the cross section shape of the molding inner core comprises a peach heart, a five-pointed star, a circle and a plum blossom, so that the molded polylactic acid fiber hollow filter stick is provided with a middle hole with a corresponding shape.
In addition, the air reaching the forming cavity needs to be purified and the temperature reaches the preset temperature, and then the air is filtered before being heated, namely the air is filtered by using a filtering bin, so that the standard of purified air is ensured to be reached; and then the pure air is heated and input into the forming cavity.
Of course, the above-mentioned predetermined temperature, that is, the heating temperature of the polylactic acid, that is, the temperature range of the air after heating to reach the cavity is 65℃to 85 ℃.
The influence of different hot air temperatures on filter stick molding production and filter stick physical indexes and appearance is examined experimentally, and the results are as follows:
TABLE 1.1 influence of different hot air temperatures on polylactic acid formation (24.0 mm. Times.120 mm)
Namely, when the polylactic acid tows are adopted to produce hollow pipe (hollow) filter sticks, and the temperature of hot air is below 60 ℃, the filter sticks cannot be quickly solidified in the forming process, so that the production condition is poor, the filter sticks deform, the roundness is poor, and the hardness is low; when the temperature of hot air is 65-85 ℃, the production condition is normal, and the indexes and the appearance of the filter stick meet the requirements; when the hot air temperature exceeds 90 ℃, the production condition is poor, and the roundness and concentricity of the filter rod are poor. Thus, it is desirable to produce hollow tube (hollow) filter rods with a hot air temperature of 65-85 ℃ which is much lower than the high temperature steam temperature used in making acetate fiber filter rods.
Of course, the inner side wall of the heating bin is provided with an electric heating wire and a temperature sensor electrically connected with the electric heating wire, and once the temperature deviates from the range of 65-85 ℃, an alarm is sent in time.
When the heating air enters the forming cavity, the air pump is pressurized, and is electrically connected with the temperature sensor in the forming cavity, and the output power of the air pump is regulated by acquiring the real-time temperature in the forming cavity, so that the temperature in the forming cavity is between 65 ℃ and 85 ℃.
For example, when the temperature sensor senses that the temperature in the molding cavity is reduced, the power of the air pump is increased, and the input flow of hot air is increased so as to increase the temperature in the cavity; if the continuous temperature is lower than 65 ℃, an alarm is sent.
In a word, make under the drive of air pump, the clean air after the filtration of filtration storehouse is in the heating storehouse department heating, and the heating air reaches the die cavity and takes charge with the polylactic acid fiber silk bundle in the shaping die cavity at last, reaches the fashioned effect of polylactic acid fiber hollow filter rod.
In addition, in the process of preparing the polylactic acid hollow filter stick, a camera and a sensor are arranged at the forming cavity, so that the feeding condition of the polylactic acid fiber tows is checked in time, and an alarm is given out in time when the polylactic acid fiber tows are abnormal.
It should be noted that the polylactic acid fiber strand feeding specification at the molding cavity is preferably 30000d×2 to 33000d×2 (corresponding to 60000 to 66000 d).
The influence of different hot air temperatures on filter stick molding production and filter stick physical indexes and appearance is examined experimentally, and the results are as follows:
TABLE 1.2 Forming cases of different total denier polylactic acid filament bundles (24.0 mm. Times.120 mm)
That is, when the polylactic acid filament bundle is adopted to produce a conventional hollow tube (hollow) filter rod, and the filament Shu Zong denier is less than 26000d×2 (i.e. 5.2 ten thousand denier), the production condition is poor, the roundness of the filter rod is poor, and the hardness is low; when the filament Shu Zong denier is 30000d multiplied by 2 to 33000d multiplied by 2 (equivalent to 60000 to 66000 d), the production condition is normal, and the index and the appearance of the filter stick meet the requirements; when the total denier of the tow exceeds 35000d×2 (i.e., 7 ten thousand denier), the production becomes worse and the filter rod index fluctuation becomes larger. Therefore, it is preferable to produce a conventional hollow tube (hollow) filter rod, and the polylactic acid tow has a specification of 30000d×2 to 33000d×2 (corresponding to 60000 to 66000 d).
Preferably, the opening is performed simultaneously using two strands of polylactic acid, each having a gauge in the range of 30000d to 33000d.
In addition, in the process of preparing the polylactic acid hollow filter stick, an application port for applying the glyceryl triacetate is arranged at the forming cavity, and the glyceryl triacetate needs to be applied to the polylactic acid fiber tows to improve the forming effect.
When the polylactic acid fiber tows are molded, the application amount of the triacetin is 12-16%.
The influence of different glyceryl triacetate application amounts on filter stick molding production and physical indexes and appearance of the filter sticks is examined experimentally, and the results are as follows:
TABLE 1.3 influence of different amounts of glyceryl triacetate applied on the shaping (24.0 mm. Times.120 mm)
Namely, when polylactic acid tows are adopted to produce hollow pipe (hollow) filter sticks, and when the application amount of the triacetin is below 10%, the production condition is still acceptable, but the filter sticks are not molded after molding, and the hardness is low; when the application amount of the glyceryl triacetate is 12% -16%, the production condition is normal, and the indexes and the appearance of the filter stick meet the requirements; when the amount of glyceryl triacetate applied exceeds 18%, the production becomes poor and the fluctuation of the filter rod index becomes large. Therefore, it is suitable to produce polylactic acid hollow tube (hollow) filter rods with a glyceryl triacetate application amount of 12% -16%.
According to the preparation method of the polylactic acid fiber hollow filter stick, the polylactic acid fiber tows are heated in a hot air heating mode, and the polylactic acid fiber hollow filter stick is obtained after solidification molding, so that the molding effect is good, the regularity is good, and the pollution is low.
The foregoing is merely exemplary embodiments of the present disclosure and is not intended to limit the scope of the present disclosure. That is, equivalent changes and modifications are contemplated by the teachings of this disclosure, which fall within the scope of the present disclosure. Embodiments of the present disclosure will be readily apparent to those skilled in the art from consideration of the specification and practice of the disclosure herein. This application is intended to cover any adaptations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a scope and spirit of the disclosure being indicated by the claims.
Claims (8)
1. A preparation method of a polylactic acid fiber hollow filter stick is characterized in that: the method comprises the following steps:
and after the polylactic acid fiber tows are opened, the polylactic acid fiber tows are sent into a forming cavity, and the polylactic acid fiber tows are heated, solidified and formed through heated air, so that the polylactic acid fiber hollow filter rod is obtained.
2. The method for preparing the polylactic acid fiber hollow filter stick according to claim 1, which is characterized in that:
the temperature of the heated air ranges from 65 ℃ to 85 ℃.
3. The method for preparing the polylactic acid fiber hollow filter stick according to claim 2, which is characterized in that:
when the heating air enters the forming cavity, the air pump is pressurized, and is electrically connected with the temperature sensing piece in the forming cavity, and the output power of the air pump is regulated by acquiring the real-time temperature in the forming cavity, so that the temperature in the forming cavity is between 65 ℃ and 85 ℃.
4. The method for preparing the polylactic acid fiber hollow filter stick according to claim 1, which is characterized in that:
the forming cavity is internally provided with a forming inner core, and the cross section shape of the forming inner core comprises a peach heart, five-pointed star, a circle and plum blossom, so that the formed polylactic acid fiber hollow filter stick has a middle hole with a corresponding shape.
5. The method for preparing the polylactic acid fiber hollow filter stick according to claim 1, which is characterized in that:
the air is filtered before it is heated.
6. The method for preparing the polylactic acid fiber hollow filter stick according to claim 1, which is characterized in that:
polylactic acid tow size ranges from 60000d to 66000d.
7. The method for preparing the polylactic acid fiber hollow filter stick according to claim 6, which is characterized in that:
in opening, two strands of polylactic acid tows are used for simultaneous opening, and the specification range of each strand of polylactic acid tows is 30000d to 33000d.
8. The method for preparing the polylactic acid fiber hollow filter stick according to claim 1, which is characterized in that:
when the polylactic acid fiber tows are molded, the application amount of the triacetin is 12-16%.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310161156.7A CN116035259A (en) | 2023-02-24 | 2023-02-24 | Preparation method of polylactic acid fiber hollow filter stick |
| PCT/CN2024/078101 WO2024175060A1 (en) | 2023-02-24 | 2024-02-22 | Preparation method for polylactic acid fiber hollow filter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310161156.7A CN116035259A (en) | 2023-02-24 | 2023-02-24 | Preparation method of polylactic acid fiber hollow filter stick |
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| CN116035259A true CN116035259A (en) | 2023-05-02 |
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| CN202310161156.7A Pending CN116035259A (en) | 2023-02-24 | 2023-02-24 | Preparation method of polylactic acid fiber hollow filter stick |
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| CN (1) | CN116035259A (en) |
| WO (1) | WO2024175060A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024175057A1 (en) * | 2023-02-24 | 2024-08-29 | 云南中烟工业有限责任公司 | Multifunctional hollow filter rod preparation apparatus |
| WO2024175060A1 (en) * | 2023-02-24 | 2024-08-29 | 云南中烟工业有限责任公司 | Preparation method for polylactic acid fiber hollow filter |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100569127C (en) * | 2006-11-30 | 2009-12-16 | 中国科学院长春应用化学研究所 | A kind of cigarette filter filament and preparation method thereof |
| CN108642601A (en) * | 2018-04-28 | 2018-10-12 | 苏州金泉新材料股份有限公司 | Polylactic acid crimps compound pipe tobacco of autoadhesion and preparation method thereof certainly |
| KR20200122043A (en) * | 2019-04-17 | 2020-10-27 | 에콜그린텍(주) | Pla cigarette filter and method for the same |
| KR102182459B1 (en) * | 2019-06-17 | 2020-11-24 | 김대식 | Manufacturing process of tow for electronic cigarette firter |
| CN210747211U (en) * | 2019-08-05 | 2020-06-16 | 上海甚舜智能科技有限责任公司 | Hollow rod forming equipment for cigarettes |
| CN110477450B (en) * | 2019-08-28 | 2023-07-11 | 深圳市智叶科技有限公司 | Filter tip for electronic cigarette and preparation method thereof |
| CN111109651B (en) * | 2019-12-30 | 2021-12-14 | 恒天长江生物材料有限公司 | Preparation method of biodegradable composite fiber glue-free hollow filter stick |
| CN116210962A (en) * | 2023-02-24 | 2023-06-06 | 云南中烟工业有限责任公司 | Multifunctional hollow filter stick preparation device |
| CN116035259A (en) * | 2023-02-24 | 2023-05-02 | 云南中烟工业有限责任公司 | Preparation method of polylactic acid fiber hollow filter stick |
-
2023
- 2023-02-24 CN CN202310161156.7A patent/CN116035259A/en active Pending
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2024
- 2024-02-22 WO PCT/CN2024/078101 patent/WO2024175060A1/en unknown
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024175057A1 (en) * | 2023-02-24 | 2024-08-29 | 云南中烟工业有限责任公司 | Multifunctional hollow filter rod preparation apparatus |
| WO2024175060A1 (en) * | 2023-02-24 | 2024-08-29 | 云南中烟工业有限责任公司 | Preparation method for polylactic acid fiber hollow filter |
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| WO2024175060A1 (en) | 2024-08-29 |
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