CN110900931A - Polylactic acid foaming material preparation facilities and product forming device thereof - Google Patents
Polylactic acid foaming material preparation facilities and product forming device thereof Download PDFInfo
- Publication number
- CN110900931A CN110900931A CN201911079965.3A CN201911079965A CN110900931A CN 110900931 A CN110900931 A CN 110900931A CN 201911079965 A CN201911079965 A CN 201911079965A CN 110900931 A CN110900931 A CN 110900931A
- Authority
- CN
- China
- Prior art keywords
- polylactic acid
- foaming
- mixer
- foaming agent
- foaming material
- 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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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/34—Auxiliary operations
- B29C44/3442—Mixing, kneading or conveying the foamable material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/34—Auxiliary operations
- B29C44/3442—Mixing, kneading or conveying the foamable material
- B29C44/3446—Feeding the blowing agent
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2067/00—Use of polyesters or derivatives thereof, as moulding material
- B29K2067/04—Polyesters derived from hydroxycarboxylic acids
- B29K2067/046—PLA, i.e. polylactic acid or polylactide
Abstract
The invention relates to the technical field of preparation of polylactic acid foamed products, and discloses a polylactic acid foamed material preparation device and a product forming device thereof. The polylactic acid resin material is melted into high-fluidity melt, when the melt is sprayed into a mixer through a spray head, a foaming agent is quickly added, the melt is sprayed onto the foaming agent, and meanwhile, the stirring blades run at high speed to further quickly and uniformly mix the melt and the foaming agent, so that the low-density polylactic acid foaming material is obtained.
Description
Technical Field
The invention relates to the technical field of polylactic acid foaming materials and product preparation, in particular to a polylactic acid foaming material preparation device and a product forming device thereof.
Background
The density of polylactic acid is 1.24g/cm3, relative to 0.92g/cm of polypropylene3The price of the polylactic acid material is higher than 35%, and the price of the unit product is obviously higher in the processing and popularization processes of the polylactic acid product, so that the expansion of the application range of the polylactic acid material is limited. Especially in the field of packaging, too high a density results in too heavy a packaged product, increasing transportation costs and creating excessive packaging. It is therefore necessary to foam polylactic acid to reduce the density of the polylactic acid product. The existing extrusion foaming molding technology appears in the market, but because a fixed-form foaming material is generally obtained, a non-fixed-form foaming material which can be immediately used for molding a product cannot be obtained, and more troubles can be brought to the subsequent molding of the foaming product.
Disclosure of Invention
The technical problem to be solved by the invention is to overcome the defects of the prior art and provide a preparation device for preparing a foaming material for instantly forming a foaming product.
The invention also provides a polylactic acid foaming product forming device.
The purpose of the invention is realized by the following technical scheme:
a polylactic acid foaming material preparation device comprises a screw extruder for extruding polylactic acid resin materials and a spray head for receiving the polylactic acid resin materials extruded from the screw extruder, wherein the spray head sprays the polylactic acid resin materials into a mixer under a high-pressure environment, a foaming agent feed port is arranged on the wall of the mixer, and a stirring blade is arranged in the mixer to uniformly mix the polylactic acid resin materials and the foaming agent.
Further, the spray head covers the mixer feed inlet to act as a cover plate for the mixer.
Furthermore, the nozzles on the spray head are uniformly distributed.
Furthermore, a high-pressure gas inlet is arranged on the spray head.
Further, the high pressure gas is high pressure nitrogen.
Further, the foaming agent is glass beads.
Furthermore, the density of the glass beads is 0.4-0.8 g/cm3。
Further, the filling amount of the foaming agent in the polylactic acid foaming material is more than 50 wt%.
A discharging port for discharging the polylactic acid foaming material is formed in the bottom of a mixer of the polylactic acid foaming material preparation device, and a mold for molding a required product is arranged at the discharging end of the discharging port.
Compared with the prior art, the invention has the following beneficial effects:
1) melting polylactic acid resin material into high-fluidity melt, quickly adding foaming agent when the melt is sprayed into a mixer through a spray head, spraying the melt onto the foaming agent, and simultaneously, enabling the stirring blades to run at high speed to further quickly and uniformly mix the melt and the foaming agent to obtain the low-density polylactic acid foaming material;
2) the discharging port of the mixer is provided with a foaming product forming mold, so that the polylactic acid foaming material can be subjected to compression molding in time, the process is simple, convenient and quick, other processes are not needed, and when a special-shaped foaming product needs to be prepared, the special-shaped forming mold with the mold transposition requirement is only needed.
Drawings
Fig. 1 is a schematic structural view of a polylactic acid foamed product molding apparatus according to example 1.
Detailed Description
The present invention will be further described with reference to the following detailed description, wherein the drawings are provided for illustrative purposes only and are not intended to be limiting; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
Example 1
As shown in fig. 1, a forming device for a polylactic acid foamed product includes a screw extruder 1 for extruding a polylactic acid resin material and a nozzle 2 for receiving the polylactic acid resin material extruded from the screw extruder, the nozzle 2 injects the polylactic acid resin material into a mixer 3 under a high pressure environment, a foaming agent inlet 33 is installed on the wall of the mixer 3, a stirring blade 31 is arranged in the mixer 3 to uniformly mix the polylactic acid resin material and the foaming agent, the stirring blade 31 is fixed at the bottom of the mixer and is driven by a driving motor 32 to rotate at a high speed, a discharge port 34 for discharging the polylactic acid foamed material is opened at the bottom of the mixer 3, and a mold 6 for forming a desired foamed product is arranged at a discharge end of the discharge port 34.
Specifically, polylactic acid resin material gets into screw extruder 1 through a funnel type charge door 4, is connected through a conveying pipeline 5 between screw extruder 1 extrusion end and the shower nozzle 2, and screw extruder 1 and the middle section part switch-on of conveying pipeline 5, and high-pressure gas lets in at the 5 head ends of conveying pipeline and makes polylactic acid resin material be pushed into shower nozzle 2, is equipped with the high-pressure gas air inlet on the shower nozzle 2 and supplies the terminal access of conveying pipeline 5, and high-pressure gas is high-pressure nitrogen gas.
Polylactic resin material will be stirred after entering blender 3 from shower nozzle 2, in order to make polylactic resin material can spill in the blender evenly, but not gather in one place, need to make shower nozzle coverage area relatively great, generally, can be branchy river cover shower nozzle and act as the apron of blender in blender feed inlet department, the blender feed inlet is a little bit less than its bottom.
In addition, the spray nozzles 21 on the spray head are uniformly distributed to ensure that the polylactic acid is uniformly sprayed, and the spray head is in a disc shape or a cuboid shape.
In the embodiment, the foaming agent is glass beads, and the density of the foaming agent is 0.4-0.8 g/cm3In the presence of glass bead foaming agentFilling amount in lactic acid foaming material>50wt%。
The polylactic acid foaming product forming device can be provided with the mould with the corresponding structure according to the shape requirement of the product, thereby being fully suitable for manufacturing the product with the special-shaped structure.
The process flow for preparing the foamed product by adopting the polylactic acid foamed product forming device of the embodiment is as follows:
1. adding a glass bead foaming agent into the mixer through a foaming agent feeding hole;
2. the polylactic resin material enters a screw extruder through a funnel-shaped charging opening, is melted and converted into high-fluidity melt under the heating and plasticizing action of the screw extruder, and is conveyed to a conveying pipe;
3. high-pressure nitrogen is pressed into the material conveying pipe through the head end of the material conveying pipe, and the high-pressure nitrogen and the high-fluidity polylactic acid melt are mixed in the material conveying pipe and enter a spray head;
4. under the action of a nozzle below the spray head, the pressure generated by high-pressure nitrogen presses the polylactic acid melt to be quickly sprayed out and sprayed on the glass beads;
5. the glass beads and the high-fluidity polylactic acid melt are quickly and uniformly mixed under the high-speed stirring of the stirring blades;
6. the mixed material of misce bene shifts to the compression molding mould lower mould die cavity fast through the discharge gate of blender, and compression molding is accomplished in the quick compound die of mould upper die.
The invention prepares the light foaming special-shaped product by melting the polylactic resin material into high-fluidity melt and mixing the high-fluidity melt with the glass beads in high proportion and matching with the traditional compression molding equipment, and the density of the product blank can be as low as 0.72g/cm3Effectively reduces the apparent density of the polylactic acid foaming product and reduces the transportation and use cost.
It should be understood that the above examples are only for clearly illustrating the technical solutions of the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (9)
1. The polylactic acid foaming material preparation device is characterized by comprising a screw extruder for extruding polylactic acid resin materials and a spray head for receiving the polylactic acid resin materials extruded from the screw extruder, wherein the spray head sprays the polylactic acid resin materials into a mixer under a high-pressure environment, a foaming agent feed port is arranged on the wall of the mixer, and stirring blades are arranged in the mixer to uniformly mix the polylactic acid resin materials and the foaming agent.
2. The apparatus as claimed in claim 1, wherein the nozzle covers a cover plate acting as a mixer at the feed port of the mixer.
3. The apparatus for preparing polylactic acid foamed material according to claim 2, wherein the nozzles of the nozzle are uniformly distributed.
4. The apparatus as claimed in claim 1, wherein the nozzle is provided with a high pressure gas inlet.
5. The apparatus for preparing polylactic acid foamed material according to claim 4, wherein the high-pressure gas is high-pressure nitrogen.
6. The apparatus for preparing polylactic acid foamed material according to claim 1, wherein the foaming agent is glass beads.
7. The apparatus for preparing polylactic acid foaming material according to claim 6, wherein the density of the glass beads is 0.4-0.8 g/cm3。
8. The apparatus as claimed in claim 1, wherein the foaming agent is filled in the polylactic acid foaming material in an amount of >50 wt%.
9. A forming device for a polylactic acid foaming product is characterized in that the device is provided with the polylactic acid foaming material preparation device as claimed in any one of claims 1 to 8, the bottom of a mixer is provided with a discharge hole for discharging the polylactic acid foaming material, and the discharge end of the discharge hole is provided with a mold for forming a required product.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911079965.3A CN110900931A (en) | 2019-11-07 | 2019-11-07 | Polylactic acid foaming material preparation facilities and product forming device thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911079965.3A CN110900931A (en) | 2019-11-07 | 2019-11-07 | Polylactic acid foaming material preparation facilities and product forming device thereof |
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| Publication Number | Publication Date |
|---|---|
| CN110900931A true CN110900931A (en) | 2020-03-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911079965.3A Pending CN110900931A (en) | 2019-11-07 | 2019-11-07 | Polylactic acid foaming material preparation facilities and product forming device thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111906983A (en) * | 2020-07-16 | 2020-11-10 | 苏州明睿威尔新型材料有限公司 | EPS make-up machine for housing construction with pressurization feeding function |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020171164A1 (en) * | 2001-05-15 | 2002-11-21 | Steve Halterbaum | Process and apparatus for making a thermoset foam |
| CN101954698A (en) * | 2009-07-16 | 2011-01-26 | 詹德威 | Mixing and injecting combined device and use method thereof |
| CN206186221U (en) * | 2016-11-14 | 2017-05-24 | 东莞市东泉模具材料有限公司 | Compounding extrusion device |
| KR20190031118A (en) * | 2017-09-15 | 2019-03-25 | 강명호 | Foam Molding Machine And Foam Molding Method Thereby |
-
2019
- 2019-11-07 CN CN201911079965.3A patent/CN110900931A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020171164A1 (en) * | 2001-05-15 | 2002-11-21 | Steve Halterbaum | Process and apparatus for making a thermoset foam |
| CN101954698A (en) * | 2009-07-16 | 2011-01-26 | 詹德威 | Mixing and injecting combined device and use method thereof |
| CN206186221U (en) * | 2016-11-14 | 2017-05-24 | 东莞市东泉模具材料有限公司 | Compounding extrusion device |
| KR20190031118A (en) * | 2017-09-15 | 2019-03-25 | 강명호 | Foam Molding Machine And Foam Molding Method Thereby |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111906983A (en) * | 2020-07-16 | 2020-11-10 | 苏州明睿威尔新型材料有限公司 | EPS make-up machine for housing construction with pressurization feeding function |
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Application publication date: 20200324 |