CN110640994A - Production system and production method of PLA bottle - Google Patents
Production system and production method of PLA bottle Download PDFInfo
- Publication number
- CN110640994A CN110640994A CN201910935518.7A CN201910935518A CN110640994A CN 110640994 A CN110640994 A CN 110640994A CN 201910935518 A CN201910935518 A CN 201910935518A CN 110640994 A CN110640994 A CN 110640994A
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- CN
- China
- Prior art keywords
- water
- pla
- bottle
- machine
- steam engine
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- 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
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
- B29C49/06—Injection blow-moulding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B13/00—Conditioning or physical treatment of the material to be shaped
- B29B13/04—Conditioning or physical treatment of the material to be shaped by cooling
- B29B13/045—Conditioning or physical treatment of the material to be shaped by cooling of powders or pellets
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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
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/42—Component parts, details or accessories; Auxiliary operations
- B29C49/64—Heating or cooling preforms, parisons or blown articles
-
- 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
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/42—Component parts, details or accessories; Auxiliary operations
- B29C49/78—Measuring, controlling or regulating
-
- 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
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/42—Component parts, details or accessories; Auxiliary operations
- B29C49/78—Measuring, controlling or regulating
- B29C49/786—Temperature
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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
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
- B29C2049/023—Combined blow-moulding and manufacture of the preform or the parison using inherent heat of the preform, i.e. 1 step blow moulding
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/712—Containers; Packaging elements or accessories, Packages
- B29L2031/7158—Bottles
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
Abstract
The invention discloses a production system and a production method of PLA bottles, and solves the problem that the PLA bottles molded in a common stretch blow molding workshop deform or shrink beyond 50 ℃ and are not beneficial to the use and transportation of the bottles at higher temperature. The invention comprises a dryer, an injection molding machine, a bottle preform heater, a drawing and blowing machine and a screen printing machine which are connected in sequence, wherein a water conveying system is connected with a die of the drawing and blowing machine and comprises a steam engine, a water cooling machine and a water pump, the water cooling machine is connected with the water pump in parallel, the steam engine is connected with the water pump in parallel, and a water conveying pipe formed by connecting the steam engine and the water pump in parallel penetrates through a water conveying channel of the drawing and blowing die; the water conveying pipe is provided with an exhaust pipe. The PLA bottle produced by the invention is high temperature resistant, does not deform and shrink at the temperature of more than 80 ℃, and greatly improves the temperature resistance of the PLA bottle; and the device can be used on the original equipment and the original mould, and only a water conveying system is needed to be added. The process is simple and the modification cost is low.
Description
Technical Field
The invention relates to the field of injection molding, drawing and blowing, in particular to a production system and a production method of a high-temperature-resistant PLA bottle.
Background
PLA has excellent biodegradability, and can be completely degraded by microorganisms in soil to generate CO in two years after being discarded2And H2O, no pollution to the environment. However, since the PLA material cannot resist high temperature under normal conditions, PLA bottles molded in a common stretch blow molding plant may deform or shrink beyond 50 ℃, which is not conducive to the use and transportation of the bottles at higher temperatures.
Disclosure of Invention
The invention aims to solve the technical problem that a PLA bottle formed in a common drawing and blowing workshop deforms or shrinks above 50 ℃ and is not beneficial to use and transportation of the bottle at higher temperature, and provides a production system of the PLA bottle with an added water conveying system and a production method thereof.
In order to solve the technical problems, the invention adopts the following technical scheme: a production system of PLA bottles comprises a dryer, an injection molding machine, a bottle preform heating machine, a drawing and blowing machine and a screen printing machine which are sequentially connected, wherein a water conveying system is connected with a die of the drawing and blowing machine and comprises a steam engine, a water cooling machine and a water pump, the water cooling machine is connected with the water pump in parallel, the steam engine is connected with the water pump in parallel, and a water conveying pipe formed by connecting the steam engine and the water pump in parallel penetrates through a water conveying channel of the drawing and blowing die; the water conveying pipe is provided with an exhaust pipe.
And the pipeline connected with the steam outlet of the steam engine is provided with an electromagnetic valve I, the pipeline connected with the water outlet of the water pump is provided with an electromagnetic valve II, the exhaust pipe is provided with an electromagnetic valve III, and the pipeline connected with the water inlet of the water cooler is provided with an electromagnetic valve IV.
A production method of a PLA bottle production system comprises the following steps of firstly dehumidifying and drying a PLA raw material at 80 ℃ for 4 hours in a dryer, secondly, carrying out injection molding on the dried raw material in an injection molding machine to produce a bottle blank at 180 ℃, thirdly, carrying out infrared heating on the bottle blank produced in the second step to 90-110 ℃ in a heater, fourthly, placing the heated bottle blank into a stretch-blow mold of the stretch-blow molding machine for stretch-blow molding, and concretely, the step of stretch-blow molding of the bottle blank comprises the steps of firstly, injecting steam at the temperature of 170 ℃ into a water conveying channel (91) in the inner layer of the stretch-blow mold through a water conveying pipe (4) by a steam engine to enable the overall temperature of the stretch-blow mold to reach more than 110 ℃, and closing the steam to obtain a crystallized PLA bottle after 20 seconds of molding crystallization and ~ 25 seconds.
And fourthly, pumping cold water of the water chiller into a water conveying channel on the inner layer of the drawing and blowing mold at the moment of closing the steam, so that the temperature of the drawing and blowing mold is sharply reduced, the temperature of the PLA bottle is sharply reduced, and the PLA bottle is demolded and taken out after the temperature of the PLA bottle is lower than 60 ℃.
The time from the cold water of the water cooling machine being driven into the water conveying channel of the inner layer of the drawing and blowing die to the completion of the demoulding of the PLA bottle is 20 ~ 25 seconds.
The steam engine is an 18kw steam engine.
The PLA bottle produced by the invention is high temperature resistant, does not deform and shrink at the temperature of more than 80 ℃, and greatly improves the temperature resistance of the PLA bottle; and the device can be used on the original equipment and the original mould, and only a water conveying system is needed to be added. The process is simple and the modification cost is low.
Drawings
FIG. 1 is a diagram of a production system for PLA bottles of the invention;
fig. 2 is a schematic diagram of the structure of the water carrying system of the PLA bottle of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.
As shown in fig. 1 and 2, a PLA bottle production system comprises a dryer, an injection molding machine, a bottle preform heater, a stretch blow machine, and a screen printing machine, which are connected in sequence, wherein a water transport system is connected to a mold 9 of the stretch blow machine, the water transport system comprises a steam engine 1, a water cooler 2, and a water pump 3, the water cooler 2 is connected in parallel with the water pump 3, the steam engine 1 is connected in parallel with the water pump 3, and a water transport pipe 4 formed by connecting the steam engine 1 and the water pump 3 in parallel passes through a water transport channel 91 of the stretch blow mold 9; the water conveying pipe 4 is provided with an exhaust pipe 5.
The pipeline connected with the steam outlet of the steam engine 1 is provided with an electromagnetic valve I11, the pipeline connected with the water outlet of the water pump 3 is provided with an electromagnetic valve II31, the exhaust pipe 5 is provided with an electromagnetic valve III51, and the pipeline connected with the water inlet of the water cooler 2 is provided with an electromagnetic valve IV 21. During normal production, the steam engine 1 is started, the electromagnetic valve I11 and the electromagnetic valve III51 are started at the same time, steam heats the stretch blow molding die through the water conveying channel 91 of the die 9, when a bottle blank is preheated on the bottle blank heater, the bottle blank is transferred into a die cavity of the stretch blow molding die, and after the bottle blank is installed in the die cavity, stretch blow molding is carried out; after blowing, drawing and forming, closing the electromagnetic valve I11 and the electromagnetic valve III51, opening the electromagnetic valve II31 and the electromagnetic valve IV21, cooling the PLA bottle after drawing and blowing is finished by cold water entering the water conveying channel 91 of the drawing and blowing mold 9, and demolding the PLA bottle after cooling is finished to finish the production of the PLA bottle.
A technology for manufacturing PLA bottle includes such steps as drying PLA at 80 deg.C for 4 hr, injection moulding at 180 deg.C in injection moulding machine to obtain bottle blank, infrared heating to 90-110 deg.C in heater, drawing and blowing the heated bottle blank in the drawing-blowing mould of drawing-blowing machine, and features that the steam at 170 deg.C is first introduced via water pipe (4) into water channel (91) in drawing-blowing mould to make the whole temp of drawing-blowing mould reach 110 deg.C or more, and after 20- ~ 25 s of crystal is formed, the crystallized PLA bottle is obtained by closing steam.
And fourthly, pumping cold water of the water chiller into a water conveying channel 91 on the inner layer of the drawing and blowing mold at the moment of closing the steam, so that the temperature of the drawing and blowing mold is sharply reduced, the temperature of the PLA bottle is sharply reduced, and the PLA bottle is demolded and taken out after the temperature of the PLA bottle is lower than 60 ℃.
The time from the cold water of the water cooler is injected into the water conveying channel 91 of the inner layer of the drawing and blowing die to the completion of the demoulding of the PLA bottle is 20 ~ 25 seconds, the crystallization point of the PLA material is 110 ℃, the crystallization can occur when the temperature of the PLA material reaches 110 ℃, the steam temperature reaches 170 ℃, the temperature of the PLA bottle blank in the die cavity can be guaranteed to reach 110 ℃, the crystallization can occur when the temperature of the bottle blank reaches 110 ℃, the crystallized PLA bottle can resist 80 ℃ and does not deform, and the steam machine is an 18kw steam machine.
Claims (6)
1. The utility model provides a production system of PLA bottle, includes the drying-machine that connects gradually, injection molding machine, bottle embryo heating machine, draws and blows machine, silk screen printing machine, its characterized in that: the water conveying system is connected with a die (9) of the drawing and blowing machine and comprises a steam engine (1), a water cooling machine (2) and a water pump (3), the water cooling machine (2) is connected with the water pump (3) in parallel, the steam engine (1) is connected with the water pump (3) in parallel, and a water conveying pipe (4) formed by connecting the steam engine (1) and the water pump (3) in parallel penetrates through a water conveying channel (91) of the drawing and blowing die (9); the water conveying pipe (4) is provided with an exhaust pipe (5).
2. The PLA bottle production system of claim 1, wherein: the pipeline connected with the steam outlet of the steam engine (1) is provided with an electromagnetic valve I (11), the pipeline connected with the water outlet of the water pump (3) is provided with an electromagnetic valve II (31), the exhaust pipe (5) is provided with an electromagnetic valve III (51), and the pipeline connected with the water inlet of the water cooler (2) is provided with an electromagnetic valve IV (21).
3. The production method of the PLA bottle production system according to any one of claims 1-2, characterized by comprising the steps of firstly dehumidifying the PLA raw material in a dryer at 80 ℃ for 4 hours, secondly, producing a bottle blank in an injection molding machine by injection molding of the dried raw material in the step (i), thirdly, heating the bottle blank produced in the step (ii) in a heating machine to 90-110 ℃ by infrared heating, fourthly, placing the heated bottle blank in a stretch-blow mold of the stretch-blow molding machine for stretch-blow molding, wherein the stretch-blow molding of the bottle blank comprises the specific steps of firstly, injecting steam with the temperature of 170 ℃ into a water conveying channel (91) in the inner layer of the stretch-blow mold through a water conveying pipe (4) by a steam engine to enable the overall temperature of the stretch-blow mold to reach more than 110 ℃, and closing the steam after 20 seconds of molding crystallization and ~ 25 seconds to obtain the crystallized PLA bottle.
4. The production method of the production system of PLA bottles of claim 3, characterized in that: and fourthly, pumping cold water of the water chiller into a water conveying channel (91) in the inner layer of the drawing and blowing mould at the moment of closing the steam, so that the temperature of the drawing and blowing mould is sharply reduced, the temperature of the PLA bottle is sharply reduced, and the PLA bottle is demolded and taken out after the temperature of the PLA bottle is lower than 60 ℃.
5. The production method of the PLA bottle production system as claimed in claim 4, wherein the time from the cold water of the water cooler is driven into the water channel (91) of the inner layer of the stretch blow mold to the completion of the demolding of the PLA bottle is 20 ~ 25 seconds.
6. The production method of the production system of PLA bottles of claim 3, characterized in that: the steam engine is an 18kw steam engine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910935518.7A CN110640994A (en) | 2019-09-29 | 2019-09-29 | Production system and production method of PLA bottle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910935518.7A CN110640994A (en) | 2019-09-29 | 2019-09-29 | Production system and production method of PLA bottle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110640994A true CN110640994A (en) | 2020-01-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910935518.7A Pending CN110640994A (en) | 2019-09-29 | 2019-09-29 | Production system and production method of PLA bottle |
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| Country | Link |
|---|---|
| CN (1) | CN110640994A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104972639A (en) * | 2014-04-08 | 2015-10-14 | 夏书志 | Production process of heat-resisting PLLA polyactic acid bottle |
| CN107471573A (en) * | 2017-09-21 | 2017-12-15 | 方乐 | A kind of equipment of technology injection moulding plastic product using control die cavity surface temperature |
| CN108891006A (en) * | 2018-07-24 | 2018-11-27 | 大中塑胶电子礼品（惠州）有限公司 | A kind of production technology of double-colored bottle |
-
2019
- 2019-09-29 CN CN201910935518.7A patent/CN110640994A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104972639A (en) * | 2014-04-08 | 2015-10-14 | 夏书志 | Production process of heat-resisting PLLA polyactic acid bottle |
| CN107471573A (en) * | 2017-09-21 | 2017-12-15 | 方乐 | A kind of equipment of technology injection moulding plastic product using control die cavity surface temperature |
| CN108891006A (en) * | 2018-07-24 | 2018-11-27 | 大中塑胶电子礼品（惠州）有限公司 | A kind of production technology of double-colored bottle |
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| PB01 | Publication | ||
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Application publication date: 20200103 |