CN106042249A - Production technology for hard PVC high foaming plate - Google Patents
Production technology for hard PVC high foaming plate Download PDFInfo
- Publication number
- CN106042249A CN106042249A CN201610392768.7A CN201610392768A CN106042249A CN 106042249 A CN106042249 A CN 106042249A CN 201610392768 A CN201610392768 A CN 201610392768A CN 106042249 A CN106042249 A CN 106042249A
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- Prior art keywords
- foaming
- plate
- production technology
- heating plate
- solvent
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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
-
- 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
-
- 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
- B29B7/00—Mixing; Kneading
- B29B7/002—Methods
- B29B7/005—Methods for mixing in batches
-
- 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
- B29C44/56—After-treatment of articles, e.g. for altering the shape
-
- 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
- B29C44/60—Measuring, controlling or regulating
-
- 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
- B29L2007/00—Flat articles, e.g. films or sheets
- B29L2007/002—Panels; Plates; Sheets
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
- Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
Abstract
The invention discloses a production technology for a hard PVC high foaming plate. A fresh solvent barrel, a diaphragm pump, a fresh solvent storage groove, a charging tank, a kneader, a charge pump, a foaming machine, an automatic conveyor, a hot air circulation oven and a cutting machine, all of which are sequentially connected are included. A solvent recycling storage groove is further formed in front of the charging tank. A heating plate I, a die and a heating plate II are arranged in the foaming machine. The bottom of the heating plate I is connected with the top of the die, and the bottom of the die is connected with the top of the heating plate II. An inlet of the die is connected with an outlet of the charge pump, and an outlet of the die is connected with the kneader. Each of the heating plate I and the heating plate II is provided with a steam heating and circulation water cooling device. According to the production technology, the hardness and foaming ratio of the PVC foaming plate are greatly improved, and the problem that hard high foaming plate materials are unavailable for PVC in China at present is solved.
Description
Technical field
The present invention relates to the production technology of a kind of PVC foam plate, be particularly suitable for the production work of hard PVC high-foaming plate
Skill.
Background technology
The market of China's external wall heat insulation system is at the early-stage at present, and standard is the most unsound, there is more problem, the most
Prominent i.e. insulation material fire resistance rating problem.On the insulation material of China, incendiary material can reach the inorganic material of A level and only account for
The market share less than 10%, and its heat-insulating property cannot match in excellence or beauty with many organic materials, and incendiary material can reach the material of B1 level
Material only accounts for the market share less than 20%, and it is expensive.Remaining more than 70% is all cheap flammable, inflammable material
(cellular insulant such as polyurethane, polystyrene, most foams plastic basis material is the most flammable, needs interpolation the most fire-retardant
Material, can be only achieved fire-retardant self-extinguishment and requires).The raw material of PVC foam product own just possesses fire-retardant self-extinguishment, and toxicity is low,
Good heat insulating, can reach the combustion of B1 level difficulty.For raw material angle, Vestolit is all foam plastics kinds
The generally the least expensive raw material being easy to get of middle raw material.
The hard PVC foamed materials great majority of China's the most industrialized production are low ratio foamed goods, and general employing is squeezed
Going out foaming, density is 0.5～0.8g/cm3.And domestic ordinary rigid PVC foam plate expansion ratio is low, high foaming PVC material
Material is concentrated mainly on flexible PVC aspect, and the production technology of domestic not hard PVC high-foaming plate.
Summary of the invention
The present invention solves the production technology problem of current hard PVC high-foaming plate, it is provided that a kind of hard PVC high-foaming
The production technology of plate, obtains the hard PVC high-foaming plate that a kind of hardness is high, expansion ratio is high, solves current domestic PVC hard
Foamed board expansion ratio is low, PVC high-foaming plate hardness is low etc. cannot be cheap as a difficult problem for external-wall heat-insulation material, can replace
The cellular insulants such as generation expensive inflammable polyurethane, polystyrene.
The technical solution used in the present invention is: the production technology of a kind of hard PVC high-foaming plate, new including be sequentially connected
Fresh solvent barrel, membrane pump, fresh solvent storage tank, feed pot, kneader, charge pump, foaming machine, transfer mechanism, hot air circulation
Baking oven, cutting machine, be additionally provided with recycling design storage tank before feed pot；The built-in heating plate of foaming machine I, mould, heating plate II, heating plate
Connecting with die top bottom I, mold bottom connects with heating plate II top, and die inlet is connected with charge pump outlet, mould
Outlet is connected with kneader, and heating plate I and heating plate II are equipped with steam heating and circulating water cooling device, and its operating procedure is such as
Under:
Chosen polyvinyl chloride resin, calcium carbonate, Pulvis Talci, aluminium hydroxide, heat stabilizer, whisker, fire retardant, cross-linking agent by formula, sent out
Infusion I, the powder material of foaming agent II, and put into feed pot, material flows into kneader through feed pot；
Starting kneader, and kneader temperature is set as 40～60 DEG C, raw material is mediated 15～20 minutes in kneader, makes
Powder particles mix homogeneously；
Open fresh solvent storage tank and the outlet valve of recycling design storage tank, by formula ratio, solvent is added in three times, pinch every time
Close 15 minutes, the most altogether mediate 60 minutes；
Compound after kneading pumps into mould through charge pump, and loads full；Set foaming machine temperature as 120～200 DEG C, pressure
Power is 100～200Kg/cm2, carrying out foamable reaction, the response time is 30～90 minutes, and now, steam inlet valve is opened, circulation
Cooling sea water inlet valve is closed, and heating plate heats up；After reaction terminates, start circulating water cooling device, steam off inlet valve, open
Circulating cooling water inlet valve, quickly cooling mould is to 30～80 DEG C, pressurize 30～40 minutes, then foaming machine bleeds off pressure taking-up and sends out
Bubble plate, the solvent foamed machine top of volatilization enters solvent recovering system；
Foamed board delivers to heated-air circulation oven through transfer mechanism, and sets heated-air circulation oven temperature as 80～130 DEG C, pressure
Power is 2.0～0kPa, places 70 minutes, and obtains target expansion ratio, and the solvent of volatilization is through obtaining heated-air circulation oven outlet
Enter solvent recovering system；
Take out the foamed board obtaining target expansion ratio, after cleaved machine cutting processing, prepare finished product.
The production technology of described a kind of hard PVC high-foaming plate, its fresh solvent storage tank, recycling design storage tank are equipped with
Relief valve, Pressure gauge, liquidometer, it is ensured that the safety of solvent tank.
The production technology of described a kind of hard PVC high-foaming plate, its fresh solvent storage tank, recycling design reservoir bottom go out
It is equipped with effusion meter at Kou, fresh solvent and recycling design can be quantitatively adding by recipe requirements.
The production technology of described a kind of hard PVC high-foaming plate, its foaming machine is the full-automatic touch screen flat panel of four-column type
Foaming machine, can carry out one or more layers foamable reaction simultaneously.
The production technology of described a kind of hard PVC high-foaming plate, its mould outlet is provided with regulation valve, regulation valve one end with
Mould outlet is connected, and the other end is connected with kneader import, controlled molding jig materials inside amount, it is ensured that mould inside material is filled
Full.
The production technology of described a kind of hard PVC high-foaming plate, the outlet of its charge pump is provided with check (non-return) valve, check (non-return) valve one end
Being connected with charge pump outlet, the other end is connected with die inlet, prevents mould inside pressure excessive, causes material adverse current.
The production technology of described a kind of hard PVC high-foaming plate, its check (non-return) valve exit is provided with blowoff valve, on the one hand,
Unnecessary material can be discharged, it is to avoid affect die sealing the tightest；On the other hand, can be to batch mixing sampling detection, it is ensured that product foams
Quality.
The production technology of described a kind of hard PVC high-foaming plate, its cutting machine is the cutting of numerical-control double-shaft reciprocal double blade
Machine, can be customized cutting by product demand specification.
The production technology of described a kind of hard PVC high-foaming plate, the solvent in its recycling design storage tank returns from solvent
Receipts system.
Beneficial effects of the present invention: the present invention production technology by hard PVC high-foaming plate, greatly improves PVC
The hardness of foamed board and expansion ratio, solve a current domestic PVC difficult problem without hard high-foaming panel material, and can progressively replace
Expensive, inflammable external-wall heat-insulation material, promotes the fire resistance of domestic external-wall heat-insulation material, solves insulation material fire-resistant
The predicament of rank difference.The present invention has the advantages such as expansion ratio is high, product hardness is high, cheap, economic benefit is high.The present invention
It is applicable in the production process of hard PVC high-foaming plate.
Accompanying drawing explanation
Fig. 1 is the process chart of the present invention.
In Fig. 1,1 is recycling design storage tank, and 2 is fresh solvent bucket, and 3 is membrane pump, and 4 is fresh solvent storage tank, and 5 is regulation
Valve, 6 is heating plate I, and 7 is mould, and 8 is heating plate II, and 9 is foaming machine, and 10 is transfer mechanism, and 11 is finished product, and 12 is cutting
Machine, 13 is heated-air circulation oven, and 14 is blowoff valve, and 15 is check (non-return) valve, and 16 is charge pump, and 17 is kneader, and 18 is feed pot.
Detailed description of the invention
Referring to the drawings 1, the invention provides the production technology of a kind of hard PVC high-foaming plate, new including be sequentially connected
Fresh solvent barrel 2, membrane pump 3, fresh solvent storage tank 4, feed pot 18, kneader 17, charge pump 16, foaming machine 9, transfer mechanism
10, heated-air circulation oven 13, cutting machine 12, be additionally provided with recycling design storage tank 1 before feed pot 18；The built-in heating plate of foaming machine 9 I 6,
Mould 7, heating plate II 8, connect with mould 7 top bottom heating plate I 6, connects with heating plate II 8 top bottom mould 7, mould
7 imports are connected with charge pump 16 outlet, and mould 7 exports and is connected with kneader 17, and heating plate I 6 and heating plate II 8 are equipped with steam
Heating and circulating water cooling device, its operating procedure is as follows:
Chosen polyvinyl chloride resin, calcium carbonate, Pulvis Talci, aluminium hydroxide, heat stabilizer, whisker, fire retardant, cross-linking agent by formula, sent out
Infusion I, the powder material of foaming agent II, and put into feed pot, material flows into kneader through feed pot；
Starting kneader, and kneader temperature is set as 40～60 DEG C, raw material is mediated 15～20 minutes in kneader, makes
Powder particles mix homogeneously；
Open fresh solvent storage tank and the outlet valve of recycling design storage tank, by formula ratio, solvent is added in three times, pinch every time
Close 15 minutes, the most altogether mediate 60 minutes；
Compound after kneading pumps into mould through charge pump, and loads full；Set foaming machine temperature as 120～200 DEG C, pressure
Power is 100～200Kg/cm2, carrying out foamable reaction, the response time is 30～90 minutes, and now, steam inlet valve is opened, circulation
Cooling sea water inlet valve is closed, and heating plate heats up；After reaction terminates, start circulating water cooling device, steam off inlet valve, open
Circulating cooling water inlet valve, quickly cooling mould is to 30～80 DEG C, pressurize 30～40 minutes, then foaming machine bleeds off pressure taking-up and sends out
Bubble plate, the solvent foamed machine top of volatilization enters solvent recovering system；
Foamed board delivers to heated-air circulation oven through transfer mechanism, and sets heated-air circulation oven temperature as 80～130 DEG C, pressure
Power is 2.0～0kPa, places 70 minutes, and obtains target expansion ratio, and the solvent of volatilization is through obtaining heated-air circulation oven outlet
Enter solvent recovering system；
Take out the foamed board obtaining target expansion ratio, after cleaved machine cutting processing, prepare finished product 11.
Another embodiment difference is that its kneader temperature is set as 40 DEG C.
Another embodiment difference is that its kneader temperature is set as 50 DEG C.
Another embodiment difference is that its kneader temperature is set as 60 DEG C.
Another embodiment difference is that its foaming machine temperature is set as 120 DEG C.
Another embodiment difference is that its foaming machine temperature is set as 150 DEG C.
Another embodiment difference is that its foaming machine temperature is set as 180 DEG C.
Another embodiment difference is that its foaming machine temperature is set as 200 DEG C.
Another embodiment difference is that its foaming machine pressure is set as 100kg/cm2。
Another embodiment difference is that its foaming machine pressure is set as 150kg/cm2。
Another embodiment difference is that its foaming machine pressure is set as 200kg/cm2。
Another embodiment difference is that its foaming machine response time is 30 minutes.
Another embodiment difference is that its foaming machine response time is 60 minutes.
Another embodiment difference is that its foaming machine response time is 90 minutes.
Another embodiment difference is that its mould chilling temperature is 30 DEG C.
Another embodiment difference is that its mould chilling temperature is 60 DEG C.
Another embodiment difference is that its mould chilling temperature is 80 DEG C.
Another embodiment difference is that its mould cooling dwell time is 30 minutes.
Another embodiment difference is that its mould cooling dwell time is 35 minutes.
Another embodiment difference is that its mould cooling dwell time is 40 minutes.
Another embodiment difference is that its heated-air circulation oven temperature is 80 DEG C.
Another embodiment difference is that its heated-air circulation oven temperature is 110 DEG C.
Another embodiment difference is that its heated-air circulation oven temperature is 130 DEG C.
Another embodiment difference is that its heated-air circulation oven pressure is 2.0kPa.
Another embodiment difference is that its heated-air circulation oven pressure is 1.0kPa.
Another embodiment difference is that its heated-air circulation oven pressure is 0kPa.
Another embodiment difference be its fresh solvent storage tank, recycling design storage tank be equipped with relief valve, Pressure gauge,
Liquidometer, it is ensured that the safety of solvent tank.
Another embodiment difference is that its fresh solvent storage tank, recycling design reservoir bottom exit are equipped with flow
Meter, can be quantitatively adding fresh solvent and recycling design by recipe requirements.
Another embodiment difference is that its foaming machine is four-column type full-automatic touch screen flat panel foaming machine, can enter simultaneously
One or more layers foamable reaction of row.
Another embodiment difference is that its mould outlet is provided with regulation valve 5, regulation valve 5 one end and mould outlet phase
Even, the other end is connected with kneader import, controlled molding jig materials inside amount, it is ensured that mould inside material is filled full.
Another embodiment difference is that the outlet of its charge pump is provided with check (non-return) valve 15, and check (non-return) valve 15 one end pumps out with charging
Mouth is connected, and the other end is connected with die inlet, prevents mould inside pressure excessive, causes material adverse current.
Another embodiment difference is that its check (non-return) valve 15 exit is provided with blowoff valve 14, on the one hand, can be by fifth wheel
Material is discharged, it is to avoid affect die sealing the tightest；On the other hand, can be to batch mixing sampling detection, it is ensured that product foaming quality.
Another embodiment difference is that its cutting machine is the reciprocal double-blade cutter of numerical-control double-shaft, can be by product demand
Specification is customized cutting.
Another embodiment difference is that the solvent in its recycling design storage tank is from solvent recovering system.
Claims (9)
1. the production technology of a hard PVC high-foaming plate, it is characterised in that include fresh solvent bucket, the barrier film being sequentially connected
Pump, fresh solvent storage tank, feed pot, kneader, charge pump, foaming machine, transfer mechanism, heated-air circulation oven, cutting machine, add
Recycling design storage tank it is additionally provided with before batch can；The built-in heating plate of foaming machine I, mould, heating plate II, with mould top bottom heating plate I
Portion connects, and mold bottom connects with heating plate II top, and die inlet is connected with charge pump outlet, mould outlet and kneader phase
Even, heating plate I and heating plate II are equipped with steam heating and circulating water cooling device, and its operating procedure is as follows:
Chosen polyvinyl chloride resin, calcium carbonate, Pulvis Talci, aluminium hydroxide, heat stabilizer, whisker, fire retardant, cross-linking agent by formula, sent out
Infusion I, the powder material of foaming agent II, and put into feed pot, material flows into kneader through feed pot；
Starting kneader, and kneader temperature is set as 40～60 DEG C, raw material is mediated 15～20 minutes in kneader, makes
Powder particles mix homogeneously；
Open fresh solvent storage tank and the outlet valve of recycling design storage tank, by formula ratio, solvent is added in three times, mediate every time
15 minutes, the most altogether mediate 60 minutes；
Compound after kneading pumps into mould through charge pump, and loads full；Set foaming machine temperature as 120～200 DEG C, pressure
Power is 100～200Kg/cm2, carrying out foamable reaction, the response time is 30～90 minutes, and now, steam inlet valve is opened, circulation
Cooling sea water inlet valve is closed, and heating plate heats up；After reaction terminates, start circulating water cooling device, steam off inlet valve, open
Circulating cooling water inlet valve, quickly cooling mould is to 30～80 DEG C, pressurize 30～40 minutes, then foaming machine bleeds off pressure taking-up and sends out
Bubble plate, the solvent foamed machine top of volatilization enters solvent recovering system；
Foamed board delivers to heated-air circulation oven through transfer mechanism, and sets heated-air circulation oven temperature as 80～130 DEG C, pressure
Power is 2.0～0kPa, places 70 minutes, and obtains target expansion ratio, and the solvent of volatilization is through obtaining heated-air circulation oven outlet
Enter solvent recovering system；
Take out the foamed board obtaining target expansion ratio, after cleaved machine cutting processing, prepare finished product.
The production technology of a kind of hard PVC high-foaming plate the most according to claim 1, it is characterised in that: fresh solvent stores up
Groove, recycling design storage tank are equipped with relief valve, Pressure gauge, liquidometer.
The production technology of a kind of hard PVC high-foaming plate the most according to claim 1, it is characterised in that: fresh solvent stores up
Groove, recycling design reservoir bottom exit are equipped with effusion meter.
The production technology of a kind of hard PVC high-foaming plate the most according to claim 1, it is characterised in that: foaming machine is four
Pillar full-automatic touch screen flat panel foaming machine, can carry out one or more layers foamable reaction simultaneously.
The production technology of a kind of hard PVC high-foaming plate the most according to claim 1, it is characterised in that: mould outlet sets
Having regulation valve, regulation valve one end to be connected with mould outlet, the other end is connected with kneader import.
The production technology of a kind of hard PVC high-foaming plate the most according to claim 1, it is characterised in that: charge pump exports
Being provided with check (non-return) valve, check (non-return) valve one end is connected with charge pump outlet, and the other end is connected with die inlet.
The production technology of a kind of hard PVC high-foaming plate the most according to claim 6, it is characterised in that: check (non-return) valve exports
Place is provided with blowoff valve.
The production technology of a kind of hard PVC high-foaming plate the most according to claim 1, it is characterised in that: cutting machine is number
The control reciprocal double-blade cutter of twin shaft.
The production technology of a kind of hard PVC high-foaming plate the most according to claim 1, it is characterised in that: recycling design stores up
Solvent in groove is from solvent recovering system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610392768.7A CN106042249A (en) | 2016-06-06 | 2016-06-06 | Production technology for hard PVC high foaming plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610392768.7A CN106042249A (en) | 2016-06-06 | 2016-06-06 | Production technology for hard PVC high foaming plate |
Publications (1)
| Publication Number | Publication Date |
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| CN106042249A true CN106042249A (en) | 2016-10-26 |
Family
ID=57170205
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610392768.7A Pending CN106042249A (en) | 2016-06-06 | 2016-06-06 | Production technology for hard PVC high foaming plate |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106584750A (en) * | 2016-12-13 | 2017-04-26 | 贵州省材料产业技术研究院 | Control method of injection foaming |
| CN108530803A (en) * | 2018-06-20 | 2018-09-14 | 佛山市凯博新材料科技有限公司 | A kind of mixing procedure and its equipment of PVC foam plate |
| WO2022191894A1 (en) * | 2021-03-10 | 2022-09-15 | Raytheon Company | Method for the generation of satellite clock and orbit corrections for global navigation satellite systems (gnss) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1891742A (en) * | 2005-07-07 | 2007-01-10 | 株式会社Jsp | Method for producing inorganic foamed body |
| CN102408645A (en) * | 2011-07-19 | 2012-04-11 | 陈桃 | Formula for PVC foaming sheet and preparation method of same |
-
2016
- 2016-06-06 CN CN201610392768.7A patent/CN106042249A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1891742A (en) * | 2005-07-07 | 2007-01-10 | 株式会社Jsp | Method for producing inorganic foamed body |
| CN102408645A (en) * | 2011-07-19 | 2012-04-11 | 陈桃 | Formula for PVC foaming sheet and preparation method of same |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106584750A (en) * | 2016-12-13 | 2017-04-26 | 贵州省材料产业技术研究院 | Control method of injection foaming |
| CN108530803A (en) * | 2018-06-20 | 2018-09-14 | 佛山市凯博新材料科技有限公司 | A kind of mixing procedure and its equipment of PVC foam plate |
| CN108530803B (en) * | 2018-06-20 | 2023-05-02 | 佛山市凯博新材料科技有限公司 | Mixing process and equipment for PVC foaming plate |
| WO2022191894A1 (en) * | 2021-03-10 | 2022-09-15 | Raytheon Company | Method for the generation of satellite clock and orbit corrections for global navigation satellite systems (gnss) |
| US11852733B2 (en) | 2021-03-10 | 2023-12-26 | Raytheon Company | Method for the generation of satellite clock and orbit corrections for global navigation satellite systems (GNSS) |
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