CN215703493U - Negative pressure chamber for degassing of PET (polyethylene terephthalate) foaming plate - Google Patents
Negative pressure chamber for degassing of PET (polyethylene terephthalate) foaming plate Download PDFInfo
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- CN215703493U CN215703493U CN202121857652.9U CN202121857652U CN215703493U CN 215703493 U CN215703493 U CN 215703493U CN 202121857652 U CN202121857652 U CN 202121857652U CN 215703493 U CN215703493 U CN 215703493U
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Abstract
The utility model provides a negative pressure chamber for degassing a PET (polyethylene terephthalate) foaming plate, which is used for actively discharging foaming gas in the PET extrusion foaming plate, so that the production period is shortened, and the negative pressure chamber is simple in structure and low in cost. It includes: a main body frame; a plurality of vacuum bags; an exhaust duct; a vacuum pump; the bottom of the main body frame is provided with a base, the periphery and the top of the main body frame are respectively packaged with the vacuum bag, and the vacuum bag on one end face of the main body frame is provided with a self-sealing zipper; the inner end of the exhaust pipeline extends into the main body frame, and the outer end of the exhaust pipeline is connected with the vacuum pump.
Description
Technical Field
The utility model relates to the technical field of processing of foaming plates, in particular to a negative pressure chamber for degassing of a PET (polyethylene terephthalate) foaming plate.
Background
The foaming agent used by the PET extrusion foaming plate is olefin gas and supercritical carbon dioxide basically, and because the melt strength of PET after tackifying is higher, foaming can be carried out only by wrapping foaming gas in the foaming process, so that the closed cell ratio of the foamed plate is higher. Thus, the wrapped foaming gas is not easy to diffuse into the air, and the wrapped foaming gas can be diffused into the air only after long-term placement and replacement, so that the production period is prolonged, and the incomplete replacement can also increase the gas content of voc for downstream product application.
Disclosure of Invention
In view of the above problems, the present invention provides a negative pressure chamber for degassing a PET foam board, which is used for actively discharging foam gas in the PET extruded foam board, so that the production cycle is shortened, and the negative pressure chamber has a simple structure and low cost.
A negative pressure chamber for degassing PET foamed sheets, characterized in that it comprises:
a main body frame;
a plurality of vacuum bags;
an exhaust duct;
a vacuum pump;
the bottom of the main body frame is provided with a base, the periphery and the top of the main body frame are respectively packaged with the vacuum bag, and the vacuum bag on one end face of the main body frame is provided with a self-sealing zipper;
the inner end of the exhaust pipeline extends into the main body frame, and the outer end of the exhaust pipeline is connected with the vacuum pump.
It is further characterized in that:
the main body frame is a cubic frame formed by welding square steel pipes, the base of the main body frame is a stainless steel plate, and sealant is arranged at the welding position of the stainless steel plate and the main body frame to ensure sealing connection;
the periphery of the vacuum bag is respectively bonded on the corresponding square steel tube of the main body frame through a sealing adhesive tape, and the area of the vacuum bag is larger than the area of the corresponding end face, so that the vacuum bag can be attached to the PET foam board during vacuum pumping;
a connecting hole is formed in one of the vacuum bags, the inner end of the exhaust pipeline is inserted into the connecting hole and is connected with the periphery of the connecting ring through a sealing adhesive tape, and sealing connection is ensured;
a plurality of folds are arranged on the surface area of the vacuum bag, so that the surface area of the vacuum bag in an unfolded state is larger than the corresponding surface area of the main body frame;
and a vacuum meter and a valve are integrated on the outer end pipeline of the exhaust pipeline positioned on the main body frame.
After the technical scheme is adopted, the self-sealing zipper on the vacuum bag corresponding to the negative pressure chamber is opened, then the 30 piled PET foaming boards placed on the tray and the tray are placed in the central position of the base of the negative pressure chamber by using a forklift, then the forklift is withdrawn, the self-sealing zipper of the negative pressure chamber is closed, the vacuum pump is started to suck air, the vacuum bag slowly shrinks towards the inside of the main body frame in the air suction process and is attached to the PET foaming board, when the negative pressure chamber has certain negative pressure, the foaming agent in the foaming board can be slowly diffused outwards, and the vacuum pump is stopped until the reading of the vacuum pressure gauge reaches-0.1; in this state, the PET foam sheet was placed in a negative pressure chamber for 2 hours to allow the gas in the deep layer inside the foam sheet to diffuse out. If the indication number of the vacuum pressure gauge is 0 within 2 hours, if too much foaming agent is in the foaming plate, the foaming agent can be continuously pumped for air suction and degassing again until the indication number of the vacuum pressure gauge is not changed any more; the PET extrusion foaming plate is used for actively discharging foaming gas in the PET extrusion foaming plate, so that the production period is shortened, and the PET extrusion foaming plate is simple in structure and low in cost.
Drawings
FIG. 1 is a schematic perspective view of the present invention;
the names corresponding to the sequence numbers in the figure are as follows:
the vacuum bag comprises a main body frame 10, a base 11, a vacuum bag 20, a self-sealing zipper 21, an exhaust pipeline 30, a vacuum pump 40, a vacuum meter 50, a valve 60 and a PET foam board 100.
Detailed Description
A negative pressure chamber for degassing PET foam board, see fig. 1: it comprises a main body frame 10, a plurality of vacuum bags 20, an exhaust duct 30 and a vacuum pump 40;
a base 11 is arranged at the bottom of the main body frame 10, a vacuum bag 20 is respectively packaged at the periphery and the top of the main body frame 10, and a self-sealing zipper 21 is arranged on the vacuum bag 20 at one end face of the main body frame 10;
the inner end of the exhaust duct 30 is inserted into the main body frame 10, and the outer end of the exhaust duct 30 is connected to a vacuum pump 40.
The main body frame 10 is a cubic frame formed by welding square steel pipes, the base 11 of the main body frame 10 is a stainless steel plate, and sealant is arranged at the welding position of the stainless steel plate and the main body frame 10 to ensure sealing connection;
the periphery of the vacuum bag 20 is respectively bonded on the corresponding square steel tube of the main body frame 10 through a sealing adhesive tape, and the area of the vacuum bag 20 is larger than the area of the corresponding end face, so that the vacuum bag 20 can be attached to the PET foaming plate during vacuum pumping;
one of the vacuum bags 20 is provided with a connecting hole, the inner end of the exhaust duct 30 is inserted into the connecting hole and connected with the periphery of the connecting ring through a sealing adhesive tape to ensure sealing connection;
the face area of the vacuum bag 20 is provided with a plurality of wrinkles such that the face area in the vacuum bag unfolded state is larger than the corresponding face area of the main body frame 10.
During specific implementation, the main frame 10 is a cubic frame formed by a stainless steel square tube and a stainless steel plate base, four square sleeves slightly larger than the stainless steel square tube are welded on four corners of the stainless steel plate base 11 through argon arc welding, so that the stainless steel square tube can be conveniently inserted, and the other four corners of the main frame 10 are also connected with the stainless steel square tube through the square sleeves slightly larger than the stainless steel square tube. The upper, left, right and rear sides of the outer side of the main body frame 10 are bonded with the vacuum bag 20 by using the sealing tape, and the area of the vacuum bag 20 is larger than that of the side surface of the main body frame, so that the vacuum bag is not broken by suction in a negative pressure state and can be attached to a PET foam board. The front surface of the main body frame 10 is also connected with a vacuum bag 20, and is provided with a self-sealing zipper 21, so that the vacuum bag can be opened and closed when the PET foam board 100 enters and exits the negative pressure chamber. The bottom of the vacuum bag 20 is connected to an exhaust duct 30, which is bonded to the vacuum bag by a sealing tape to prevent air leakage, the exhaust duct 30 is made of a PVC steel hose having a diameter of 1 inch, the exhaust duct 30 is connected to a vacuum pump 40, and a vacuum gauge 50 and a valve 60 are installed on the exhaust duct 30. The vacuum gauge 50 is mainly used for observing the air pressure condition in the negative pressure chamber, and the valve 60 is mainly used for closing the exhaust pipeline and stopping the vacuum pump 40 when the vacuum degree of the negative pressure chamber reaches the minimum value, so that the long-term work of the vacuum pump 40 is avoided, the service life is prolonged, and the energy is wasted.
The vacuum bag 20 is embodied as a double-layered belt structure or a single-layered film structure.
The working principle is as follows, the self-sealing zipper on the vacuum bag corresponding to the negative pressure chamber is opened, then a forklift is used for placing 30 piled PET foaming boards placed on the tray and the tray into the central position of the base of the negative pressure chamber, then the forklift exits, the self-sealing zipper of the negative pressure chamber is closed, the valve is opened, the vacuum pump is started to suck air, the vacuum bag slowly shrinks towards the inside of the main body frame in the air suction process and is attached to the PET foaming board, when the negative pressure chamber has certain negative pressure, the foaming agent in the foaming board can slowly diffuse outwards, and the valve is closed until the indication of the last vacuum pressure gauge reaches-0.1 to stop the vacuum pump; in this state, the PET foam sheet was placed in a negative pressure chamber for 2 hours to allow the gas in the deep layer inside the foam sheet to diffuse out. If the indication number of the vacuum pressure gauge is 0 within 2 hours, if too much foaming agent is in the foaming plate, the foaming agent can be continuously pumped for air suction and degassing again until the indication number of the vacuum pressure gauge is not changed any more; the PET extrusion foaming plate is used for actively discharging foaming gas in the PET extrusion foaming plate, so that the production period is shortened, and the PET extrusion foaming plate is simple in structure and low in cost.
It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (6)
1. A negative pressure chamber for degassing PET foamed sheets, characterized in that it comprises:
a main body frame;
a plurality of vacuum bags;
an exhaust duct;
a vacuum pump;
the bottom of the main body frame is provided with a base, the periphery and the top of the main body frame are respectively packaged with the vacuum bag, and the vacuum bag on one end face of the main body frame is provided with a self-sealing zipper;
the inner end of the exhaust pipeline extends into the main body frame, and the outer end of the exhaust pipeline is connected with the vacuum pump.
2. A negative pressure chamber for degassing PET foam board according to claim 1, characterized in that: the main body frame is a cubic frame formed by welding square steel pipes, the base of the main body frame is a stainless steel plate, and a sealant is arranged at the welding position of the stainless steel plate and the main body frame.
3. A negative pressure chamber for degassing PET foam board according to claim 2, characterized in that: the periphery of the vacuum bag is bonded on the corresponding square steel pipe of the main body frame through a sealing adhesive tape, and the area of the vacuum bag is larger than the area of the corresponding end face.
4. A negative pressure chamber for degassing PET foam board according to claim 3, characterized in that: one vacuum bag is provided with a connecting hole, and the inner end of the exhaust pipeline is inserted into the connecting hole and connected with the periphery of the connecting ring through a sealing adhesive tape.
5. A negative pressure chamber for degassing PET foam board according to claim 1, characterized in that: the face area of the vacuum bag is provided with a plurality of folds.
6. A negative pressure chamber for degassing PET foam board according to claim 1, characterized in that: and a vacuum meter and a valve are integrated on the outer end pipeline of the exhaust pipeline positioned on the main body frame.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121857652.9U CN215703493U (en) | 2021-08-10 | 2021-08-10 | Negative pressure chamber for degassing of PET (polyethylene terephthalate) foaming plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121857652.9U CN215703493U (en) | 2021-08-10 | 2021-08-10 | Negative pressure chamber for degassing of PET (polyethylene terephthalate) foaming plate |
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| Publication Number | Publication Date |
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| CN215703493U true CN215703493U (en) | 2022-02-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202121857652.9U Active CN215703493U (en) | 2021-08-10 | 2021-08-10 | Negative pressure chamber for degassing of PET (polyethylene terephthalate) foaming plate |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114953315A (en) * | 2022-05-12 | 2022-08-30 | 格力电器（武汉）有限公司 | Vacuum foaming device and foaming method |
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2021
- 2021-08-10 CN CN202121857652.9U patent/CN215703493U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114953315A (en) * | 2022-05-12 | 2022-08-30 | 格力电器（武汉）有限公司 | Vacuum foaming device and foaming method |
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