CN115413819A - Group-processed polylactic acid fiber filter stick and preparation method thereof - Google Patents
Group-processed polylactic acid fiber filter stick and preparation method thereof Download PDFInfo
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- CN115413819A CN115413819A CN202211162199.9A CN202211162199A CN115413819A CN 115413819 A CN115413819 A CN 115413819A CN 202211162199 A CN202211162199 A CN 202211162199A CN 115413819 A CN115413819 A CN 115413819A
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- 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
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- 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
- A24D3/06—Use of materials for tobacco smoke filters
- A24D3/08—Use of materials for tobacco smoke filters of organic materials as carrier or major constituent
- A24D3/10—Use of materials for tobacco smoke filters of organic materials as carrier or major constituent of cellulose or cellulose derivatives
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Abstract
The invention provides a polylactic acid fiber filter stick processed in groups and a preparation method thereof, and relates to the technical field of cigarette preparation. The invention has simple arrangement, strictly controls the property of the polylactic acid raw material, ensures that all outer skins have uniform crystallinity and all inner cores have uniform crystallinity, ensures that the knots are uniformly distributed when the tows are crystallized, ensures that the inner side and the outer side of the prepared polylactic acid fiber filter stick have gradually changed crystallinity, has more stable processing process and ensures the adsorption performance of the filter stick.
Description
Technical Field
The invention relates to the technical field of cigarette preparation, in particular to a polylactic acid fiber filter stick processed in groups and a preparation method thereof.
Background
Polylactic acid (PLA) is prepared by fermenting starch in renewable plant resources to prepare lactic acid, and then is prepared into a high polymer material through chemical synthesis, has good cyclic regeneration and biodegradability, and has the following characteristics: 1. renewable plant resources (corn, wheat, beet, rice, potato, sweet potato and the like) and organic wastes (corncobs or roots, stems, leaves, peels and the like of other crops) are taken as raw materials, so that the dependence on wood and petroleum resources is eliminated, and the requirements of sustainable development are met; 2. the biological material can be completely biodegraded, can be naturally decomposed into water and carbon dioxide in a natural environment after a certain time, does not cause environmental pollution, and the generated carbon dioxide is recycled through plant photosynthesis to form a permanent and closed carbon circulation system which is a 'green material' worthy of the name; 3. compared with three synthetic fibers of terylene, chinlon and acrylon, the energy consumption for producing the polylactic acid fiber is lower, and the polylactic acid fiber is a high molecular material with relatively low resource and environmental load; 4. has good processing performance, and can be used for producing tows by adopting a common melt spinning method of thermoplastic resin.
At present, polylactic acid fiber has been developed and used in the field of cigarette tow, but the performance requirements of polylactic acid fiber for cigarette tow and the conventional polylactic acid tow for clothing are greatly different, for example, polylactic acid fiber for clothing must meet the requirements of fiber spinning, weaving, fabric printing and dyeing, washing and ironing, must have high crystallinity, orientation degree and mechanical strength, can resist 80-100 ℃, must be insoluble and non-swelling in detergent aqueous solution and dry cleaning solvent, needs certain hygroscopicity, and has better adsorption on other gas substances in the surrounding environment. However, as the cigarette tow, the following requirements need to be satisfied: (1) The filter stick made by rolling the filter stick is non-toxic, tasteless and good in safety; (2) The tow stability is good, and the requirements of filter stick forming equipment and process can be met; (3) The filter stick has proper rigidity and curling performance, so that the filter stick has good elasticity and openness, and can meet certain requirements on hardness, suction resistance and appearance quality by adding a plasticizer or an adhesive under the condition of less tow filling amount, and has higher stick yield; (4) The cigarette filter tip has enough heat resistance, and the filter tip does not collapse or deform in the smoking process of the cigarette; (5) the filter has higher filtering efficiency on harmful components in the smoke; and (6) the sensory quality of the cigarettes is not influenced. Therefore, special spinning and post-treatment process technology must be developed to meet the requirement of the cigarettes.
For example, chinese patent invention CN103074716A relates to a sheath-core polylactic acid cigarette tow and a filter stick and a preparation method thereof, wherein a single fiber in the tow is a sheath-core structure composed of an inner core and an outer sheath, the main body resins of the sheath layer and the core layer are polylactic acid, the weight ratio of the sheath layer resin to the core layer resin is 20: 80 to 40: 60, the crystallinity of the tow sheath layer and the core layer is 3-25% and 25-60%, and the melting points of the sheath layer and the core layer are 120-150 ℃ and 150-175 ℃. Said invention combines the advantages of both core layer and skin layer, the core layer provides higher physical mechanical property and heat-resisting property, and the skin layer provides good adhesive property. Common plasticizers (such as glyceryl triacetate) can be conveniently used for filter stick forming processing. In addition, the core layer and the skin layer of the sheath-core polylactic acid tow provided by the invention have good biodegradability, and the tow is environment-friendly cigarette tow.
However, the above filter stick preparation structure still has the following problems: the sheath resin and the core resin are both prepared by adopting composite spinning of various raw materials, the properties of polylactic acid raw materials are not controlled, the differences of the crystallization degrees of the various raw materials and the positions and the differences of the strand nodes are large, so that the sheath-core polylactic acid strand processing process is unstable.
Therefore, in order to solve the above problems, it is necessary to design a reasonably and efficiently grouping-processed polylactic acid fiber filter stick.
Disclosure of Invention
The invention aims to provide a polylactic acid fiber filter stick processed in a grouping mode, which is simple in arrangement and capable of strictly controlling the properties of polylactic acid raw materials, so that all outer skins have uniform crystallinity, all inner cores also have uniform crystallinity, knots are uniformly distributed when tows are crystallized, the inner side and the outer side of the prepared polylactic acid fiber filter stick have gradually changed crystallinity, and the processing process is more stable.
In order to achieve the purpose, the invention is realized by adopting the following technical scheme:
the polylactic acid fiber filter stick processed in a grouped manner comprises an inner core and an outer skin arranged on the outer side of the inner core, wherein the inner core and the outer skin are both formed by compounding a plurality of polylactic acid fiber tows, the polylactic acid fiber tows in the inner core are prepared from a first component raw material, the polylactic acid fiber tows in the outer skin are prepared from a second component raw material, the content of a levolactic acid monomer in the first component raw material is higher than that of a levolactic acid monomer in the second component raw material, a dispersing agent is added into the first component raw material, and glyceryl triacetate is added into the second component raw material; the polylactic acid fiber tows in the inner layer core are prepared by induced crystallization through drawing stress, and the crystallinity of the polylactic acid fiber tows in the inner layer core is improved.
Preferably, the number ratio of the polylactic acid fiber tows in the inner core layer and the outer sheath layer ranges from 30.
Preferably, a nucleating agent is added to both the first component raw material and the second component raw material, and the content of the nucleating agent in the first component raw material is not lower than that in the second component raw material.
Preferably, a transition layer is arranged between the inner core and the outer sheath, the transition layer is formed by compounding a plurality of polylactic acid fiber tows, and the polylactic acid fiber tows in the transition layer are made of component raw materials, wherein the content of the levolactic acid monomer in the component raw materials is not higher than that in the first component raw material and is not lower than that in the second component raw material.
Preferably, the number of the transition layers is at least two, and the content of the levolactic acid monomer in the component raw materials adopted by the polylactic acid fiber tows of the transition layer close to the inner layer core is not lower than that of the component raw materials adopted by the polylactic acid fiber tows of the transition layer close to the outer layer sheath.
Preferably, a nucleating agent is also added into the component raw materials adopted by the polylactic acid fiber tows of the transition layer, and the content of the nucleating agent in the component raw materials is not higher than that in the first component raw material and not lower than that in the second component raw material.
Preferably, the outer skin is provided with an acetate tow layer on the outside.
The invention also provides a preparation method of the polylactic acid fiber filter stick processed in a grouping manner, which comprises the following steps:
s1: the method comprises the steps of obtaining polylactic acid with the levorotatory content of a first preset value, adding a dispersing agent to obtain a first component raw material, and performing drafting stress induced crystallization on the first component raw material during spinning to obtain a first polylactic acid fiber tow;
s2: obtaining polylactic acid with the levorotatory content of a second preset value, adding glyceryl triacetate to obtain a second component raw material, and spinning the second component raw material to a second polylactic acid fiber tow; the second predetermined value is lower than the first predetermined value;
s3: and compounding a plurality of first polylactic acid fiber tows to form an inner layer core, compounding a plurality of second polylactic acid fiber tows to form an outer layer skin, and coating the outer layer skin on the outer side of the inner layer core to form the skin-core type polylactic acid fiber filter stick.
Preferably, before the step S3 is executed, polylactic acid with a levorotatory content of a third predetermined value is obtained, a third polylactic acid fiber tow is obtained, and a plurality of third polylactic acid fiber tows are compounded to form a transition layer;
and when the step S3 is executed, covering the transition layer on the outer side of the inner layer core, and covering the outer layer skin on the outer side of the transition layer.
Preferably, after step S3 is performed, the outer sheath is covered with a tow layer of acetate fibers.
The polylactic acid fiber filter stick processed in groups and the preparation method thereof have the beneficial effects that: the setting is simple, and the nature of polylactic acid raw materials is strictly controlled, so that all outer skins have uniform crystallinity, all inner cores also have uniform crystallinity, and the knots are uniformly distributed when the tows are crystallized, and the inner side and the outer side of the prepared polylactic acid fiber filter stick have gradually changed crystallinity, so that the processing process is more stable.
Drawings
FIG. 1 is a schematic cross-sectional view of one embodiment of a filter rod of a group-processed polylactic acid fiber according to the present invention;
FIG. 2 is a schematic flow chart of a preparation method of a grouping-processed polylactic acid fiber filter stick according to the invention;
in the figure: 1. inner core, 2 outer sheath, 3 transition layer, 4 acetate tow layer.
Detailed Description
The following are specific examples of the present invention and further describe the technical solutions of the present invention, but the present invention is not limited to these examples.
Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the modules and steps set forth in these embodiments and steps do not limit the scope of the invention unless specifically stated otherwise.
Meanwhile, it should be understood that the flows in the drawings are not merely performed individually for convenience of description, but a plurality of steps are performed alternately with each other.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only used for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used solely to distinguish one from another, and are not to be construed as indicating or implying relative importance.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.
Techniques, methods, and systems known to those of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate.
The first embodiment is as follows: as shown in fig. 1, a group-processed polylactic acid fiber filter stick comprises an inner core 1 and an outer skin 2 arranged outside the inner core 1, wherein the inner core 1 and the outer skin 2 are both formed by compounding a plurality of polylactic acid fiber tows, the polylactic acid fiber tows in the inner core 1 are prepared from a first component raw material, the polylactic acid fiber tows in the outer skin 2 are prepared from a second component raw material, the content of a levolactic acid monomer in the first component raw material is higher than that of a levolactic acid monomer in the second component raw material, a dispersing agent is added into the first component raw material, and glyceryl triacetate is added into the second component raw material; the polylactic acid fiber tows in the inner layer core 1 are prepared by induced crystallization through drawing stress, so that the crystallinity of the polylactic acid fiber tows in the inner layer core 1 is improved.
In the invention, polylactic acid with the levorotatory content at a first preset value is obtained, a dispersant is added to obtain a first component raw material, and the first component raw material is subjected to drafting stress induced crystallization during spinning to obtain a first polylactic acid fiber tow, so that the first polylactic acid fiber tow has higher crystallinity and higher physical and mechanical properties and heat resistance; the dispersant is added, so that large nodes are not easy to form in the first polylactic acid fiber tow with high crystallinity, and the cutting is convenient.
Generally, the first predetermined value ranges from 95% to 98%, that is, the first component raw material contains 95% to 98% of levorotatory isomer (that is, levorotatory lactic acid monomer), and with such a high content of levorotatory isomer, the melting point of the first polylactic acid fiber tow will also be high, and in the spinning and post-processing processes, through the drawing stress induced low-temperature crystallization, the crystallinity of the tow after drawing is improved, the dimensional thermal stability of the tow is improved, and the tow can be curled and shaped well, so that the tow is ensured to have appropriate rigidity and curling performance, good elasticity and openability, and low thermal shrinkage performance.
Similarly, polylactic acid with the levorotatory content at a second preset value is obtained, glyceryl triacetate is added to obtain a second component raw material, and the second component raw material is spun into a second polylactic acid fiber tow; the second predetermined value is lower than the first predetermined value; the crystallinity of the second polylactic acid fiber tow is lower than that of the first polylactic acid fiber tow, but more swelling property and bonding property are provided under the addition of triacetin.
The second predetermined value is not higher than the first predetermined value; generally, the second predetermined value ranges from 92% to 95%, the second component raw material contains 92% to 95% of levorotatory isomer, and glyceryl triacetate needs to be added to the second component raw material, the second polylactic acid fiber tow swells and bonds under the action of the glyceryl triacetate, and finally the second predetermined value can be matched with the first polylactic acid fiber tow obtained from the first component raw material to obtain the polylactic acid tow with a well-bonded sheath-core structure.
And finally, compounding a plurality of first polylactic acid fiber tows to form an inner layer core, compounding a plurality of second polylactic acid fiber tows to form an outer layer skin, and coating the outer layer skin on the outer side of the inner layer core to form the skin-core type polylactic acid fiber filter stick.
Here, the ratio of the number of the polylactic acid fiber tow in the inner core 1 and the outer sheath 2 is in the range of 30 to 35, that is, the ratio of the core to the sheath is in this range.
It should be noted that: in the polylactic acid fiber filter rods produced in the same batch, the production areas, the batches and the purification steps of all the first component raw materials are the same;
in the polylactic acid fiber filter stick produced in the same batch, the production place, the batch and the purification steps of all the second component raw materials are the same.
It can also be understood that: in one polylactic acid filter rod or a batch of polylactic acid filter rods which are produced simultaneously, all the first polylactic acid fiber tows have the same property, and the crystallinity of all the produced first polylactic acid fiber tows is uniformly distributed, so that large agglomeration is not easy to generate, and the alloy cutter is not easy to impact and damage during slitting; the properties of all the second polylactic acid fiber tows are also the same.
Therefore, the properties of the polylactic acid raw material are strictly controlled, so that all outer skins have uniform crystallinity, all inner cores also have uniform crystallinity, and the tows have uniform node distribution during crystallization, so that the processing process is more stable.
And the crystallinity of the first polylactic acid fiber tows is higher than that of the second polylactic acid fiber tows, the inner side and the outer side of the prepared polylactic acid fiber filter rod have gradually changed crystallinity, and the multilayer structure is processed in groups.
Since the raw materials of the polylactic acid fiber tows in the inner layer core and the outer layer skin need to be guaranteed to be the same in original place, batch and purification steps, namely uniqueness, the raw materials cannot be mixed for processing on the premise that a cigarette factory simultaneously feeds the two types of raw materials, the two types of raw materials are directly prepared on two different production lines to obtain two different polylactic acid fiber tows, the raw materials with high content of the levolactic acid monomer are prepared according to the preparation mode of the inner layer core, the raw materials with low content of the levolactic acid monomer are prepared according to the preparation mode of the outer layer skin, and finally the two types of polylactic acid fiber tows are combined in an internal-external distribution mode, so that the uniqueness of the single-layer raw materials is achieved, and the gradient of the crystallinity of the internal side and the external side is met.
The polylactic acid fiber filter stick processed in a grouping manner is simple in arrangement, the properties of polylactic acid raw materials are strictly controlled, all outer skins have uniform crystallinity, all inner cores also have uniform crystallinity, knots are uniformly distributed when tows are crystallized, the inner side and the outer side of the prepared polylactic acid fiber filter stick have gradually changed crystallinity, and the processing process is more stable.
In the second embodiment, as shown in fig. 1, which is only one embodiment of the present invention, on the basis of the first embodiment, a nucleating agent is added to both the first component raw material and the second component raw material, and the content of the nucleating agent in the first component raw material is not lower than that in the second component raw material, so that the crystallinity of the inner side and the outer side of the polylactic acid fiber filter stick is gradually increased.
And a transition layer 3 is arranged between the inner layer core 1 and the outer layer sheath 2, the transition layer is formed by compounding a plurality of polylactic acid fiber tows, and the polylactic acid fiber tows in the transition layer 3 are made of component raw materials, wherein the content of the levolactic acid monomer in the component raw materials is not higher than that in the first component raw material and is not lower than that in the second component raw material.
Actually, the number of the transition layers 3 is at least two, and the content of the lactic acid monomer in the component raw materials adopted by the polylactic acid fiber tows of the transition layer 3 close to the inner layer core 1 is not lower than that of the polylactic acid fiber tows of the transition layer 3 close to the outer layer sheath 2.
The plurality of transition layers 3 are also processed in groups, a plurality of finished production lines can process a plurality of raw materials to form polylactic acid fiber tows, and finally, the polylactic acid fiber tows are coated layer by layer according to the content relation of the levolactic acid monomer.
And the component raw materials adopted by the polylactic acid fiber tows of the transition layer 3 are also added with nucleating agents, the content of the nucleating agents in the component raw materials is not higher than that of the nucleating agents in the first component raw materials and is not lower than that of the nucleating agents in the second component raw materials, and under the condition of a plurality of transition layers, the more nucleating agents are added in the component raw materials adopted by the polylactic acid fiber tows of the transition layer 3 which is closer to the inner side.
Finally, an acetate fiber tow layer is arranged on the outer side of the outer layer skin 2, namely, an acetate fiber tow outer layer covers the outer side of the polylactic acid fiber tow filter rod, and the structure stability of the filter rod is better and the adsorption performance of the filter rod is guaranteed by utilizing the bonding effect and the adsorption performance of the acetate fiber tow layer.
In a third embodiment, as shown in fig. 2, the present invention further provides a method for preparing a component-processed polylactic acid fiber filter stick in all the above embodiments, which includes the following steps:
s1: the method comprises the steps of obtaining polylactic acid with the levorotatory content being a first preset value, adding a dispersing agent to obtain a first component raw material, and obtaining a first polylactic acid fiber tow through drafting stress induced crystallization when the first component raw material is spun;
s2: obtaining polylactic acid with the levorotatory content of a second preset value, adding glyceryl triacetate to obtain a second component raw material, and spinning the second component raw material to a second polylactic acid fiber tow; the second predetermined value is lower than the first predetermined value;
s3: and compounding a plurality of first polylactic acid fiber tows to form an inner layer core, compounding a plurality of second polylactic acid fiber tows to form an outer layer skin, and coating the outer layer skin on the outer side of the inner layer core to form the skin-core type polylactic acid fiber filter stick.
Before the step S3 is executed, polylactic acid with the levorotatory content at a third preset value is obtained, a third polylactic acid fiber tow is obtained, and a plurality of third polylactic acid fiber tows are compounded to form a transition layer;
and when the step S3 is executed, covering the transition layer on the outer side of the inner layer core, and covering the outer layer skin on the outer side of the transition layer.
After step S3 is carried out, coating a layer of acetate tow outside the outer layer sheath.
The invention relates to a polylactic acid fiber filter stick processed in groups and a preparation method thereof, which are simple in arrangement and strictly control the property of a polylactic acid raw material, so that all outer skins have uniform crystallinity, all inner cores also have uniform crystallinity, the nodes are uniformly distributed when tows are crystallized, the inner side and the outer side of the prepared polylactic acid fiber filter stick have gradually changed crystallinity, the processing process is more stable, and the adsorption performance of the filter stick is guaranteed.
The present invention is not limited to the above-described specific embodiments, and various modifications and variations are possible. Any modifications, equivalent substitutions, improvements and the like of the above embodiments according to the technical essence of the present invention should be included in the scope of protection of the present invention.
Claims (10)
1. The polylactic acid fiber filter stick processed in a grouping way is characterized in that: the polylactic acid fiber composite material comprises an inner core (1) and an outer skin (2) arranged on the outer side of the inner core (1), wherein the inner core (1) and the outer skin (2) are formed by compounding a plurality of polylactic acid fiber tows, the polylactic acid fiber tows in the inner core (1) are prepared from a first component raw material, the polylactic acid fiber tows in the outer skin (2) are prepared from a second component raw material, the content of a levolactic acid monomer in the first component raw material is higher than that of a levolactic acid monomer in the second component raw material, a dispersing agent is added into the first component raw material, and glyceryl triacetate is added into the second component raw material; the polylactic acid fiber tows in the inner layer core (1) are prepared by drawing stress induced crystallization and used for improving the crystallinity of the polylactic acid fiber tows in the inner layer core (1).
2. The group-processed polylactic acid fiber filter stick according to claim 1, wherein: the number ratio of the polylactic acid fiber tows in the inner layer core (1) and the outer layer sheath (2) ranges from 30 to 35.
3. The group-processed polylactic acid fiber filter stick according to claim 1, wherein: nucleating agents are added into the first component raw material and the second component raw material, and the content of the nucleating agents in the first component raw material is not lower than that of the nucleating agents in the second component raw material.
4. The group-processed polylactic acid fiber filter stick according to claim 1, wherein: a transition layer (3) is arranged between the inner layer core (1) and the outer layer skin (2), the transition layer is formed by compounding a plurality of polylactic acid fiber tows, and the content of a levolactic acid monomer in component raw materials adopted by the polylactic acid fiber tows in the transition layer (3) is not higher than that of a levolactic acid monomer in the first component raw material and is not lower than that of a levolactic acid monomer in the second component raw material.
5. A packet-processed polylactic acid fiber filter stick according to claim 4, wherein: the number of the transition layers (3) is at least two, and the content of the levolactic acid monomer in the component raw materials adopted by the polylactic acid fiber tows of the transition layers (3) close to the inner layer core (1) is not lower than that of the component raw materials adopted by the polylactic acid fiber tows of the transition layers (3) close to the outer layer sheath (2).
6. A packet-processed polylactic acid fiber filter stick according to claim 4, wherein: the polylactic acid fiber tows of the transition layer (3) are also added with nucleating agents in component raw materials, and the content of the nucleating agents in the component raw materials is not higher than that of the nucleating agents in the first component raw materials and not lower than that of the nucleating agents in the second component raw materials.
7. The group-processed polylactic acid fiber filter stick according to claim 1, wherein: an acetate fiber tow layer (4) is arranged on the outer side of the outer layer leather (2).
8. The preparation method of the component-processed polylactic acid fiber filter stick according to any one of claims 1 to 7, which is characterized by comprising the following steps:
s1: the method comprises the steps of obtaining polylactic acid with the levorotatory content being a first preset value, adding a dispersing agent to obtain a first component raw material, and obtaining a first polylactic acid fiber tow through drafting stress induced crystallization when the first component raw material is spun;
s2: obtaining polylactic acid with the levorotatory content of a second preset value, adding glyceryl triacetate to obtain a second component raw material, and spinning the second component raw material to a second polylactic acid fiber tow; the second predetermined value is lower than the first predetermined value;
s3: and compounding a plurality of first polylactic acid fiber tows to form an inner layer core, compounding a plurality of second polylactic acid fiber tows to form an outer layer skin, and coating the outer layer skin on the outer side of the inner layer core to form the skin-core type polylactic acid fiber filter stick.
9. The method for preparing the polylactic acid fiber filter stick processed according to the claim 8, which is characterized in that:
before the step S3 is executed, polylactic acid with the levorotatory content at a third preset value is obtained, a third polylactic acid fiber tow is obtained, and a plurality of third polylactic acid fiber tows are compounded to form a transition layer;
and when the step S3 is executed, coating the transition layer on the outer side of the inner core, and coating the outer skin on the outer side of the transition layer.
10. The method for preparing the polylactic acid fiber filter stick according to claim 8, which comprises the following steps:
and after the step S3 is carried out, coating an acetate tow layer on the outer side of the outer sheath.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211162199.9A CN115413819A (en) | 2022-09-23 | 2022-09-23 | Group-processed polylactic acid fiber filter stick and preparation method thereof |
| PCT/CN2023/076384 WO2024060499A1 (en) | 2022-09-23 | 2023-02-16 | Group-processed polylactic acid fiber filter rod and preparation method therefor |
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| CN202211162199.9A CN115413819A (en) | 2022-09-23 | 2022-09-23 | Group-processed polylactic acid fiber filter stick and preparation method thereof |
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| WO (1) | WO2024060499A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116236854A (en) * | 2023-05-11 | 2023-06-09 | 广东鑫球新材料科技有限公司 | Filter element with variable degradation material |
| WO2024060499A1 (en) * | 2022-09-23 | 2024-03-28 | 云南中烟工业有限责任公司 | Group-processed polylactic acid fiber filter rod and preparation method therefor |
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| JP2009148233A (en) * | 2007-12-21 | 2009-07-09 | Japan Tobacco Inc | Smoking article |
| JP2009102796A (en) * | 2008-12-28 | 2009-05-14 | Unitika Ltd | Nonwoven fabric formed of polylactic acid based composite staple fiber, and method for producing the same |
| CN103074716B (en) * | 2013-02-07 | 2015-04-22 | 中国烟草总公司郑州烟草研究院 | Sheath-core polylactic acid tobacco tow and filter stick and preparation method thereof |
| US20170145597A1 (en) * | 2014-04-22 | 2017-05-25 | Fiber Innovation Technology, Inc. | Fibers comprising an aliphatic polyester blend, and yarns, tows, and fabrics formed therefrom |
| CN106945321A (en) * | 2016-01-06 | 2017-07-14 | 余姚市创辉树脂笔头厂 | A kind of microporous fibre bar preparation method |
| CN106637500A (en) * | 2016-11-08 | 2017-05-10 | 江南大学 | High-heat-resistance skin-core structural polylactic acid fiber and preparation method thereof |
| CN107199754B (en) * | 2017-06-14 | 2019-03-26 | 淄博成达塑化有限公司 | The biodegradable 3D printing silk and preparation method thereof of three layers of skin-core structure |
| CN216701614U (en) * | 2021-09-01 | 2022-06-10 | 上海烟草集团有限责任公司 | Cigarette filter stick based on fiber woven structure |
| CN115413819A (en) * | 2022-09-23 | 2022-12-02 | 云南中烟工业有限责任公司 | Group-processed polylactic acid fiber filter stick and preparation method thereof |
-
2022
- 2022-09-23 CN CN202211162199.9A patent/CN115413819A/en active Pending
-
2023
- 2023-02-16 WO PCT/CN2023/076384 patent/WO2024060499A1/en unknown
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024060499A1 (en) * | 2022-09-23 | 2024-03-28 | 云南中烟工业有限责任公司 | Group-processed polylactic acid fiber filter rod and preparation method therefor |
| CN116236854A (en) * | 2023-05-11 | 2023-06-09 | 广东鑫球新材料科技有限公司 | Filter element with variable degradation material |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2024060499A1 (en) | 2024-03-28 |
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