Moisture-free drying PLA (polylactic acid) modified granulation equipment and granulation method

Abstract

The invention relates to the field of PLA, in particular to PLA modified granulation equipment free of wet drying and a granulation method. The equipment comprises a base (1), wherein a double-screw granulator (4) is arranged on the base (1); the processing area of the double-screw granulator (4) comprises a first area (71) of the double-screw granulator, second to fourth areas (72) of the double-screw granulator and a fifth area (73) of the double-screw granulator; a vacuumizing structure (7) is arranged on a second area to a fourth area (72) of the screw granulator, a filter screen (8) is arranged at the bottom of the vacuumizing structure (7), and an air draft structure (9) is arranged on the vacuumizing structure (7); and a heating device (2) is arranged on the first area (71) of the double-screw granulator and can heat the PLA raw material to 40-60 DEG C. Independent dehumidification and drying of the PLA raw material are avoided, and the process cost and the energy consumption cost of PLA modified granulation are greatly reduced.

Description

Technical Field

[0001] The invention relates to the field of PLA, in particular to dehumidification-free drying PLA modified granulation equipment and a granulation method. Background Art

[0002] In the process of modified granulation of PLA materials, it is generally necessary to dehumidify and dry the particles in advance, and then mix them with other raw materials for granulation. The separate dehumidification and drying of PLA raw materials increases the production process. The PLA raw materials need to be transported to the dehumidification and drying tank first, and the dehumidification and drying tank needs to be heated separately to dry the raw materials. In this process, on the one hand, it is easy to cause the raw materials to agglomerate; on the other hand, the dehumidification and drying cost is high, which increases the production cost of modified granulation products.

[0003] On December 17, 2024, a search was conducted in the Chinese Patent Publication Database with "PLA and drying and vacuuming and granulation" as the abstract keywords, and the option of allowing synonym expansion was checked, but no relevant literature was found.

[0004] On December 17, 2024, a search was conducted on the website of the United States Patent and Trademark Office for "PLA with drying with vacuuming with granulation", and no relevant literature was found; the search URL was https: / / ppubs.uspto.gov / pubwebapp / .

[0005] On December 17, 2024, a search was conducted on the Korean Patent Office for "PLA and drying and vacuuming and granulation", and 16 documents were found but no relevant documents were found; the search URL was http: / / eng.kipris.or.kr / enghome / main.jsp.

[0006] On December 17, 2024, a search was conducted on WIPO's https: / / patentscope2.wipo.int / for "PLA and drying and vacuuming and granulation", and no relevant literature was found.

[0007] On December 17, 2024, a search was conducted on the Japan Patent Office website https: / / www.j-platpat.inpit.go.jp / for "PLA and drying and vacuuming and granulation", but no relevant literature was found.

[0008] Completely different from the concept of this patent. Summary of the invention

[0009] Purpose of the invention: To provide a better dehumidification-free PLA modified granulation equipment and granulation method. The specific purpose can be seen in the multiple substantial technical effects of the specific implementation part.

[0010] In order to achieve the above purpose, the present invention adopts the following technical solutions: PLA modified granulation equipment without dehumidification and drying, characterized in that: The device comprises a base 1, on which a twin-screw granulator 4 is arranged; The processing area of ​​the twin screw granulator 4 includes a twin screw granulator zone 1 71, screw granulator zones 2 to 4 72, and a twin screw granulator zone 5 73; A vacuum pumping structure 7 is arranged on the second to fourth zones 72 of the screw granulator, a filter screen 8 is arranged at the bottom of the vacuum pumping structure 7, and an exhaust structure 9 is arranged on the vacuum pumping structure 7; A heating device 2 is arranged on the first zone 71 of the twin-screw granulator, and the heating device 2 can heat the PLA raw material to 40-60°C.

[0011] The dehumidification-free PLA modification and granulation method is characterized by comprising the following steps: By installing a vacuum device in the second to fourth zones of the twin-screw granulator, the PLA raw material is heated by utilizing the front end temperature of the twin-screw granulator; When the particles are transported to the second to fourth zones of the twin-screw granulator, the particle temperature just reaches 40-60°C, and the particles have not yet melted, so the moisture in the raw materials will not cause the hydrolysis of PLA; At the same time, the vacuum structure 7 installed in the screw granulator zone 2-zone 4 72 can remove the moisture in the raw materials in time; After the PLA raw material is conveyed to the twin-screw granulator zone 5 73, the PLA particles begin to plasticize, and at this time, the moisture in the PLA raw material has been removed.

[0012] A further technical solution of the present invention is that a filter screen 8 is arranged at the bottom of the vacuum structure 7, and the filter screen 8 can extract air and block particles.

[0013] The present invention adopting the above technical scheme has the following beneficial effects compared with the prior art: the present invention uses the online drying of the twin-screw granulator to heat the PLA by utilizing the heating temperature of the twin-screw equipment itself, and then dries the moisture, thereby avoiding the separate dehumidification and drying of the PLA raw material, and greatly reducing the process cost and energy consumption cost of PLA modification granulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to further illustrate the present invention, the following is further described in conjunction with the accompanying drawings: Figure 1 A schematic diagram of the structure of the invention; Figure 2 It is a regional layout diagram of the prior art; Figure 3 for Figure 1 The local structure diagram of Figure 4 A structural diagram of the prior art for the invention; Figure 5 A diagram of the steps of the invention; Among them: 1. Base; 2. Heating device; 3. Lifting structure; 4. Twin-screw granulator; 5. Motor; 6. Heating part; 7. Vacuuming structure; 8. Filter; 9. Exhaust structure; 71. Twin-screw granulator zone 1; 72. Twin-screw granulator zones 2-4; 73. Twin-screw granulator zone 5. DETAILED DESCRIPTION

[0015] The present invention is further explained below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. In the description of the present invention, it should be noted that the orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "top", "bottom", etc. is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal connection of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific circumstances.

[0016] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0017] This patent provides a variety of parallel solutions. The different expressions are improved solutions or parallel solutions based on the basic solution. Each solution has its own unique characteristics. In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other. The fixing method not described in the text can be any fixing method such as thread fixing, bolt fixing or glue bonding.

[0018] PLA modified granulation equipment without dehumidification and drying, characterized in that: The device comprises a base 1, on which a twin-screw granulator 4 is arranged; The processing area of ​​the twin screw granulator 4 includes a twin screw granulator zone 1 71, screw granulator zones 2 to 4 72, and a twin screw granulator zone 5 73; A vacuum pumping structure 7 is arranged on the second to fourth zones 72 of the screw granulator, a filter screen 8 is arranged at the bottom of the vacuum pumping structure 7, and an exhaust structure 9 is arranged on the vacuum pumping structure 7; A heating device 2 is arranged on the first zone 71 of the twin-screw granulator, and the heating device 2 can heat the PLA raw material to 40-60°C.

[0019] The dehumidification-free PLA modification and granulation method is characterized by comprising the following steps: By installing a vacuum device in the second to fourth zones of the twin-screw granulator, the PLA raw material is heated by utilizing the front end temperature of the twin-screw granulator; When the particles are transported to the second to fourth zones of the twin-screw granulator, the particle temperature just reaches 40-60°C, and the particles have not yet melted, so the moisture in the raw materials will not cause the hydrolysis of PLA; At the same time, the vacuum structure 7 installed in the screw granulator zone 2-zone 4 72 can remove the moisture in the raw materials in time; After the PLA raw material is conveyed to the twin-screw granulator zone 5 73, the PLA particles begin to plasticize, and at this time, the moisture in the PLA raw material has been removed.

[0020] A further technical solution of the present invention is that a filter screen 8 is arranged at the bottom of the vacuum structure 7, and the filter screen 8 can extract air and block particles.

[0021] It should be noted that the multiple solutions provided by this patent include the basic solution itself, which are independent of each other and do not restrict each other, but they can also be combined with each other without conflict to achieve multiple effects together.

[0022] The basic principle, main features and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the protection required.

Claims

1. PLA modified granulation equipment without dehumidification and drying, characterized in that: The device comprises a base (1), on which a twin-screw granulator (4) is arranged; The processing area of ​​the twin-screw granulator (4) includes a twin-screw granulator zone 1 (71), screw granulator zones 2 to 4 (72), and a twin-screw granulator zone 5 (73); A vacuum pumping structure (7) is arranged on the second to fourth zones (72) of the screw granulator, a filter screen (8) is arranged at the bottom of the vacuum pumping structure (7), and an exhaust structure (9) is arranged on the vacuum pumping structure (7); A heating device (2) is arranged on the first zone (71) of the twin-screw granulator, and the heating device (2) can heat the PLA raw material to 40-60°C.

2. A dehumidification-free PLA modification granulation method, characterized in that: The following steps are included: By installing a vacuum device in the second to fourth zones of the twin-screw granulator, the PLA raw material is heated by utilizing the front end temperature of the twin-screw granulator; When the particles are transported to the second to fourth zones of the twin-screw granulator, the particle temperature just reaches 40-60°C, and the particles have not yet melted, so the moisture in the raw materials will not cause the hydrolysis of PLA; At the same time, the vacuum structure (7) installed in the screw granulator zone 2 to zone 4 (72) can remove the moisture in the raw materials in time; After the PLA raw material is conveyed to the fifth zone (73) of the twin-screw granulator, the PLA particles begin to plasticize, and at this time, the moisture in the PLA raw material has been removed.

3. The dehumidification-free PLA modification and granulation method according to claim 1, characterized in that: A filter screen (8) is arranged at the bottom of the vacuum extraction structure (7); the filter screen (8) is capable of extracting air and blocking particles.

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