CN106370560A - Frying oil quality fast-evaluation method and device - Google Patents
Frying oil quality fast-evaluation method and device Download PDFInfo
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- CN106370560A CN106370560A CN201610689183.1A CN201610689183A CN106370560A CN 106370560 A CN106370560 A CN 106370560A CN 201610689183 A CN201610689183 A CN 201610689183A CN 106370560 A CN106370560 A CN 106370560A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N11/00—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties
- G01N11/02—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by measuring flow of the material
- G01N11/04—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by measuring flow of the material through a restricted passage, e.g. tube, aperture
- G01N11/06—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by measuring flow of the material through a restricted passage, e.g. tube, aperture by timing the outflow of a known quantity
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
- G01N13/02—Investigating surface tension of liquids
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- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
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- Frying-Pans Or Fryers (AREA)
Abstract
The invention provides a frying oil quality fast-evaluation method and device. The device for measurement is portable, can be operated easily, is poisonless and harmless, is suitable for frying on-site quality control, is free of a consumable material, has an infinite service life and greatly reduces a use cost. Grease is classified and evaluated according to main fatty acid types so that oil-caused frying oil quality evaluation interference is avoided. The method and device are convenient, fast, reliable and practical.
Description
Technical field
The invention belongs to food quality detection technical field is and in particular to a kind of Fast Evaluation fries the evaluation side of oil quality
Method and its equipment.
Background technology
The edible oil being applied to decoct, explode food is referred to as frying oil, including vegetable oil, hydrogenated vegetable oil and mixed oil etc..
Vegetable, meat productss or aquatic products etc. are directly contacted with deep fat during frying, and food generates golden yellow or dark-brown surface
And produce tempting local flavor, therefore deeply liked by consumer.
In the frying course of food, the situation that frying oil exists in air, moisture content and food debriss, continuous high temperature adds
Heat, oils and fatss produce the chemical reaction of the series of complexes such as polymerization, decomposition and oxidation, and Oxidation of Fat and Oils becomes small molecule aldehyde hydrocarbon and polymerization
Thing, grease hydrolysis generate acid.Meanwhile, it is suspended in the carbonized residue (as tiny flour, starch granuless) in oils and fatss, become acceleration
Oxidation of Fat and Oils reaction and the catalyst of hydrolysis.After long-time use, acid number and peroxide value raise frying oil, serious shadow
Ring product quality, the shelf-life shortening product even produces food safety hidden danger.Due to frying oil and consumer food directly contact,
Usually through control oil quality to guarantee food safety in science.National standard gb7102.1-2003 regulation frying prevailing for the time being in force
The upper limit of oily polar compound and acid number is respectively 27% and 5mg koh/g.
With regard to frying the evaluation of oil quality, national and foreign standards are generally acknowledged using polar compound column chromatography method and acid number titration
Method.But this two methods to there is analysis time long, consumption of organic solvent is big, the shortcomings of complex operation, in the reality at frying scene
Border application is frequently subjected to limit.There are some researches show the prolongation oils and fatss with frying time, oils and fatss deteriorate, surface tension reduces,
Kinematic viscosity increases, the frying oil samples to known difference degradation, measures specific pipeline fall time contrast regulation simultaneously
Limit value, thus realize frying the Fast Evaluation of oil quality.
Therefore, accurately and reliably and be suitable for frying scene oil quality Fast Evaluation instrument, to ensure domestic health of masses
Significant with public health.
Content of the invention
The purpose of this part is to summarize some aspects of embodiments of the invention and briefly introduce some preferably to implement
Example.A little simplification may be done in this part and the description of the present application summary and denomination of invention or omit to avoid making our department
Point, the purpose of specification digest and denomination of invention obscure, and this simplify or omit cannot be used for limiting the scope of the present invention.
In view of problem present in the detection of above-mentioned and/or existing edible oil quality is it is proposed that the present invention.
Therefore, the one of purpose of the present invention is to solve deficiency of the prior art, provides one kind to be based on kinematic viscosity
Fry oil quality fast appraisement method with capillary, the method can fry oil product by Fast Evaluation on the premise of lossless sample
Matter, for judging whether frying oil should discard offer reliable basis.
For solving above-mentioned technical problem, the technical scheme is that a kind of Fast Evaluation fries oil quality
Method, it includes, at a certain temperature, according to without frying each quasi-grease freely flow to end completely from special container when
Between difference, different types of oils and fatss are carried out sort out distinguish, and accordingly set quality limit the time, be designated as t；By oils and fatss to be measured
Through certain time frying, then under described specified temp, it is positioned in described special container, measures it from described special container
In time of freely flowing to end completely, be designated as t；The relatively size of t and t, wherein, as t ＞ t, evaluates this frying oil and should discard；
As t≤t, evaluate this frying oil and can continue to use.
Fry a kind of preferred version of the evaluation methodology of oil quality as Fast Evaluation of the present invention, wherein: described spy
Constant temperature degree is 30 DEG C.
The present invention another purpose therein is to overcome existing device chemical detection method complex operation, inapplicable frying existing
The problem of field, provides a kind of Fast Evaluation to fry the equipment of oil quality.
For solving above-mentioned technical problem, the technical scheme is that a kind of Fast Evaluation fries oil quality
Equipment, including temperature measurement component, accommodating assembly, and, timing bench, described accommodating assembly includes housing, funnel, and connects institute
State the handle of housing and funnel, temperature measurement component one end is connected with described housing, timing bench is arranged at described enclosure interior, institute
State one end that temperature measurement component is connected with described housing and be provided with wobble-plate, described wobble-plate is provided with shrinkage pool, described shrinkage pool
Match with the salient point of described case inside；One end that described handle is connected with described housing is provided with external screw thread, described outer
Screw thread is matched with the female thread of knob, and described knob is arranged in the bayonet socket of described housing.
Fry a kind of preferred version of the equipment of oil quality as Fast Evaluation of the present invention, wherein: in described housing
Side is additionally provided with by compression leg, described laterally another inner side extension from the one of described housing by compression leg, and passes through described another interior
Side and protrude from described hull outside.
Fry a kind of preferred version of the equipment of oil quality as Fast Evaluation of the present invention, wherein: described wobble-plate
It is flexibly connected with described housing phase by rotating shaft, described rotating shaft is arranged at described enclosure interior.
As Fast Evaluation of the present invention fry oil quality equipment a kind of preferred version, wherein: described by compression leg
It is arranged at the upper end of described wobble-plate, and do not contact setting with described wobble-plate.
Fry a kind of preferred version of the equipment of oil quality as Fast Evaluation of the present invention, wherein: outside described knob
Portion is provided with vertical stripe, and described vertical stripe protrudes from outside described knob.
Fry a kind of preferred version of the equipment of oil quality as Fast Evaluation of the present invention, wherein: described timing group
Part shows electronic watch for liquid crystal digital.
The beneficial effects of the present invention is:
1st, measuring apparatus are portable, easy to operate and nontoxic, are suitable for the quality control at frying scene；
2nd, measuring apparatus no material consumption, the measurement life-span is unlimited, greatly reduces use cost；
3rd, according to main fatty acid type, oils and fatss are carried out evaluation of classification, it is to avoid oil product is done to frying oil quality evaluation
Disturb, convenient and swift, reliable and practical；
4th, the present invention is based on kinematic viscosity and capillary frying oil quality fast appraisement method, it is possible to achieve lossless fast
Speed detection, is that accurate evaluation fried food safely provides reliable basis.The method not only can be used as current frying oil Quality Detection
The useful supplement of method, and probably become the Main Means that oil quality field control is fried in middle-size and small-size food and drink in the future.
Brief description
In order to be illustrated more clearly that the technical scheme of the embodiment of the present invention, below will be to required use in embodiment description
Accompanying drawing be briefly described it should be apparent that, drawings in the following description are only some embodiments of the present invention, for this
For the those of ordinary skill of field, without having to pay creative labor, other can also be obtained according to these accompanying drawings
Accompanying drawing.Wherein:
Fig. 1 is that a kind of overall structure of the equipment that Fast Evaluation fries oil quality described in one embodiment of the invention is illustrated
Figure；
Fig. 2 is a kind of accommodating assembly local of the equipment that described in one embodiment of the invention, Fast Evaluation fries oil quality
Sectional structure enlarged diagram；
Fig. 3 is that a kind of accommodating assembly of the equipment that described in one embodiment of the invention, Fast Evaluation fries oil quality is overall
Structure chart；
Fig. 4 is a kind of temperature measurement component structure of the equipment that Fast Evaluation fries oil quality described in one embodiment of the invention
Schematic diagram；
Fig. 5 is a kind of accommodating component internal of the equipment that Fast Evaluation fries oil quality described in one embodiment of the invention
Structure enlarged diagram.
Specific embodiment
Understandable for enabling the above objects, features and advantages of the present invention to become apparent from, with reference to specific embodiment pair
The specific embodiment of the present invention is described in detail.
Elaborate a lot of details in the following description in order to fully understand the present invention, but the present invention is acceptable
To be implemented different from alternate manner described here using other, those skilled in the art can be without prejudice to intension of the present invention
In the case of do similar popularization, therefore the present invention is not limited by following public specific embodiment.
Secondly, " embodiment " or " embodiment " referred to herein refers to may be included at least one realization side of the present invention
Special characteristic in formula, structure or characteristic.Different places occur in this manual " in one embodiment " not refers both to
Same embodiment, is not single or optionally mutually exclusive with other embodiment embodiment.
In frying course, in deep fryer, frying oils there occurs chemistry and the physical change of fierceness, from hydroperoxides
Generate and decompose and create saturation and the volatile compound such as unsaturated aldehyde, ketone, hydrocarbon, alcohol；Heat and oxidation connection due to free radical
Cooperation makes the viscosity of frying oils significantly carry with producing dimerization and many polyoxygenated triglyceride material, the result of polymerization
High；Triacylglycerol hydrolysis generates free fatty, and these changes make oil viscosity increase with free fatty acid content, and color and luster becomes
Secretly, iodine number and reduction in surface tension, refractive index changes, and forming foam tendency increases.Reacting specific technical scheme is:
At a certain temperature, according to the time freely flow to end completely from special container without each quasi-grease of frying
Different types of oils and fatss are carried out sorting out and distinguish, and set the quality restriction time accordingly, are designated as t by difference；By oils and fatss to be measured through one
Fix time frying, then under described specified temp, be positioned in described special container, measure it complete from described special container
The time entirely freely flow to end, it is designated as t；The relatively size of t and t, wherein, as t ＞ t, evaluates this frying oil and should discard；Work as t
During≤t, evaluate this frying oil and can continue to use.
The present invention is then the kinematic viscosity and capillary characterization parameter based on frying oil, and frying oil quality is carried out soon
Speed is evaluated, and simultaneously with the increase of temperature, the surface tension of liquid and viscosity are all affected, and show after further research,
When 30 DEG C about, the surface tension of frying oil and the fluctuation of viscosity with temperature are little, and in practical operation, easily protect for 30 DEG C
Card, will not increase other costs, temperature is locked in 30 DEG C by the therefore present invention.
Collated, obtain oil product type identification table.
Embodiment 1
Pour 5l soybean oil into into pot, the French fries being sized, quality is impartial are inserted in pot and is fried, daily frying
8 hours, continue 10 days, every sampling in 4 hours once.The sample collecting is transferred in beaker and is cooled to 30 DEG C, by equipment
In immersion oil and stand 2min, observe temperature registration it is ensured that oil temperature is at 30 DEG C.Lifting funnel starts to count to completely disengaging from pasta
When, in equipment, oils and fatss fall naturally, keep equipment vertically stable, are drained off as timing end point completely with oils and fatss, record total time.
Comparison oil product type identification table, its abandoned oil fall time of selected soybean oil is 60 (± 3) s, obtains and wherein fries
Oil sample after 48h, recording 30 DEG C of fall times is 65s, exceeds limit value, judges that this frying oil should be discarded.
Embodiment 2
Continuously fry chicken nugget using 5l Petiolus Trachycarpi oil, be heated to 182.5 DEG C and maintain 182.5 ± 5 DEG C.To be sized, product
The impartial chicken nugget of matter is inserted in pot and is fried, daily frying 8 hours, continues 6 days, every sampling in 4 hours once.To collect
Sample be transferred in beaker and be cooled to room temperature, and control oil temperature to be maintained at 30 DEG C, by equipment immersion oil and stand 2min, see
Examine temperature registration it is ensured that oil temperature is at 30 DEG C.Lifting funnel starts timing to completely disengaging from pasta, and in equipment, oils and fatss fall naturally,
Holding equipment is vertically stable, is drained off as timing end point completely with oils and fatss, records total time.
Comparison oil product type identification table, the fall time of selected its abandoned oil of Petiolus Trachycarpi oil is 68 (± 3) s.
Obtain and wherein fry oil sample after 12h, recording 30 DEG C of fall times is 54s, without departing from limit value, can be continuing with.
Obtain and wherein fry oil sample after 48h, recording 30 DEG C of fall times is 75s, exceeds limit value, judges that frying oil should
Discarded.
Embodiment 3
Commercial mixed oil is transferred to beaker, and controls oil temperature to be maintained at 30 DEG C, by equipment immersion oil and stand 1min,
Observe temperature registration it is ensured that its temperature is maintained at 30 DEG C.Lifting funnel start timing to completely disengaging from pasta, in equipment oils and fatss from
So fall, keep equipment vertically stable, drained off as timing end point completely with oils and fatss, record total time.
Continuously fry fish fillet using this mixed oil of 5l, be heated to 182.5 DEG C and maintain 182.5 ± 5 DEG C.To be sized,
The impartial fish fillet of quality is inserted in pot and is fried, daily frying 8 hours, continues 10 days, every sampling in 4 hours once.To adopt
The sample collecting is transferred in beaker and is cooled to room temperature, and controls oil temperature to be maintained at 30 DEG C, by equipment immersion oil and stand
1min, observes temperature registration it is ensured that temperature is 30 DEG C.Lifting funnel start timing to completely disengaging from pasta, in equipment oils and fatss from
So fall, keep equipment vertically stable, drained off as timing end point completely with oils and fatss, record total time.
Comparison oil product type identification table, takes non-frying mixed oil sample, and recording 30 DEG C of fall times is 45s, is judged to Asia
Oleic acid-induced oils and fatss, its abandoned oil fall time for 60 (± 3s).
Take oil sample after wherein frying 36h, recording fall time is 68s, exceeds limit value, judges that frying oil should be discarded.
Embodiment 4
Commercial mixed oil is transferred to beaker, and controls oil temperature to be maintained at 30 DEG C, by equipment immersion oil and stand 1min,
Observe temperature registration so as to be maintained at 30 DEG C.Lifting funnel starts timing to completely disengaging from pasta, under oils and fatss nature in equipment
Fall, keep equipment vertically stable, drained off as timing end point completely with oils and fatss, record total time.
Continuously fry fish fillet using this mixed oil of 5l, be heated to 182.5 DEG C and maintain 182.5 ± 5 DEG C.To be sized,
The impartial fish fillet of quality is inserted in pot and is fried, daily frying 8 hours, continues 10 days, every sampling in 4 hours once.To adopt
The sample collecting is transferred in beaker and is cooled to room temperature, and controls oil temperature to be maintained at 30 DEG C, by equipment immersion oil and stand
1min, observes temperature registration so as to be maintained at 30 DEG C.Lifting funnel start timing to completely disengaging from pasta, in equipment oils and fatss from
So fall, keep equipment vertically stable, drained off as timing end point completely with oils and fatss, record total time.
Comparison oil product type identification table, takes non-frying mixed oil sample, and recording 30 DEG C of fall times is 51s, is judged to oil
Acid type oils and fatss, its abandoned oil fall time is 68 (± 3) s.
Obtain and wherein fry oil sample after 12h, recording fall time is 60s, according to oleic acid-induced oils and fatss abandoned oil limit value is
64s, without departing from limit value, judges that frying oil can be continuing with.
Obtain and wherein fry oil sample after 36h, recording fall time is 69s, according to oleic acid-induced oils and fatss abandoned oil limit value is
73s, exceeds limit value, judges that frying oil should be discarded.
The present invention, for the faster convenient Fast Evaluation frying oil quality, additionally provides a kind of Fast Evaluation frying oil product
The equipment of matter, as shown in figure 1, that includes temperature measurement component 100, accommodating assembly 200 and timing bench 300, specifically, accommodating group
Part 200 includes housing 201, handle 202 and funnel 203.Housing 201 is connected integral, and thermometric by handle 202 with funnel 203
Assembly 100 one end is connected with housing 201, and the other end freely hangs.Timing bench 300 is arranged at housing 201 inside and is liquid
Brilliant digital display electronic watch, can directly read time of measuring.
Referring to Fig. 2～4, temperature measurement component 100 is connected with housing 201 by the wobble-plate 101 of its one end, wobble-plate 101
In disk form, multiple shrinkage pool 101a are circumferentially set thereon, and shrinkage pool 101a can be matched with the salient point 201a of housing 201 inner side
Close, thus shrinkage pool 101a engaging with salient point 201a can be passed through when temperature measurement component 100 carries out the swing deflection of certain angle
And fix.The rotating shaft 101b that wobble-plate 101 passes through within housing 201 is flexibly connected, and achievable temperature measurement component 100 can rotate
Certain angle.Be additionally provided with inside housing 201 by compression leg 201c, by compression leg 201c from the one of housing 201 lateral another inner side
Extend, and pass through described another inner side to protrude from outside housing 201.It is arranged at the upper end of wobble-plate 101 by compression leg 201c, and
Do not contact setting with wobble-plate 101.When the temperature measurement component 100 going to certain angle and be fixed needs to reset, pressing
Protrude from housing 201 outside by compression leg 201c, thus forcing housing 201 local deformation so that shrinkage pool 101a and salient point 201a
It is separated, thus engagement release state, temperature measurement component 100 is due to action of gravity reset.Certainly, in the present embodiment, thermometric group
Part 100 can select thermometer.
As shown in Figure 3 and Figure 5, one end that handle 202 is connected with housing 201 is provided with external screw thread 202a, external screw thread
202a is matched with the female thread of knob 202b, completes rising or falling of handle 202 by turn.Knob 202b is arranged at shell
In the bayonet socket 201b of body 201, and due to being connected with the handle 202 being arranged within housing 201, it is achieved thereby that it is limited in
In bayonet socket 201b.It is provided with vertical stripe outside knob 202b, vertical stripe protrudes from outside described knob 202b, be easy to rotation behaviour
Make.Can control funnel 203 by rotary knob to be freely lifted, realize immersion and leach link.
As can be seen here, the present invention by the numerous studies of physics after fried for the oils and fatss and chemical change it is proposed that base
Judge the new method whether frying oil should be discarded in sign oils and fatss kinematic viscosity and capillary fall time；And according to
Oils and fatss are carried out evaluation of classification by main fatty acid type, it is to avoid the interference to quality evaluation for the oil product, have also widened this simultaneously
The bright scope of application, enhances practicality.Meanwhile, the Fast Evaluation that the present invention provides fries the equipment of oil quality, by inside and outside
Screw thread coordinates, and realizes funnel liftable；By the shrinkage pool of temperature measurement component wobble-plate and the salient point cooperation of case inside, realize thermometric
Assembly can be fixed at a certain angle, forcing housing local deformation by pressing by compression leg, so that shrinkage pool is separated with salient point, thus solving
Except fastening state, reach temperature measurement component rotatably reducible function, to adapt to measuring condition and the environment of various complexity.Permissible
Seem, Fast Evaluation proposed by the present invention fries the equipment of oil quality, facilitates portable, easy to operate and nontoxic, applicable
The quality control at frying scene；Measuring apparatus no material consumption, the measurement life-span is unlimited, greatly reduces use cost, having very much in the future can
The Main Means that oil quality Site Detection is fried in middle-size and small-size food and drink can be become.
Described above has fully disclosed the specific embodiment of the present invention.It is pointed out that being familiar with this field
Any change that technical staff is done to the specific embodiment of the present invention is all without departing from the scope of claims of the present invention.
Correspondingly, the scope of the claim of the present invention is also not limited only to previous embodiment.
Claims (8)
1. a kind of Fast Evaluation fry oil quality method it is characterised in that: include,
At a certain temperature, according to the time freely flow to end completely from special container without each quasi-grease of frying not
With, different types of oils and fatss are carried out sort out and distinguish, and the setting quality restriction time accordingly, it is designated as t；
Oils and fatss to be measured were fried through certain time, then under described specified temp, is positioned in described special container, measures it
The time freely flow to end completely from described special container, it is designated as t；
The relatively size of t and t, wherein, as t ＞ t, evaluates this frying oil and should discard；As t≤t, evaluate this frying oil energy
Enough it is continuing with.
2. according to claim 1 Fast Evaluation fry oil quality evaluation methodology it is characterised in that: described specified temp is
30℃.
3. a kind of Fast Evaluation fries the equipment of oil quality, including temperature measurement component (100), accommodating assembly (200), and, timing
Assembly (300), described accommodating assembly (200) includes housing (201), funnel (203), and connects described housing (201) and leakage
The handle (202) of bucket (203), temperature measurement component (100) one end is connected with described housing (201), and timing bench (300) is arranged at
Described housing (201) internal it is characterised in that:
One end that described temperature measurement component (100) is connected with described housing (201) is provided with wobble-plate (101), described wobble-plate
(101) it is provided with shrinkage pool (101a) on, described shrinkage pool (101a) is matched with the salient point (201a) inside described housing (201)；
One end that described handle (202) is connected with described housing (201) is provided with external screw thread (202a), described external screw thread
(202a) match with the female thread of knob (202b), described knob (202b) is arranged at the bayonet socket of described housing (201)
(201b) in.
4. according to claim 3 Fast Evaluation fry oil quality equipment it is characterised in that: inside described housing (201)
It is additionally provided with by compression leg (201c), described laterally another inner side extension from the one of described housing (201) by compression leg (201c), and
Protrude from outside described housing (201) through described another inner side.
5. according to claim 3 or 4 Fast Evaluation fry oil quality equipment it is characterised in that: described wobble-plate (101)
Mutually it is flexibly connected with described housing (201) by rotating shaft (101b), described rotating shaft (101b) is arranged in described housing (201)
Portion.
6. according to claim 4 Fast Evaluation fry oil quality equipment it is characterised in that: described set by compression leg (201c)
It is placed in the upper end of described wobble-plate (101), and do not contact setting with described wobble-plate (101).
7. according to claim 5 Fast Evaluation fry oil quality equipment it is characterised in that: described knob (202b) is outside
It is provided with vertical stripe, it is outside that described vertical stripe protrudes from described knob (202b).
8. according to the arbitrary described Fast Evaluation in claim 3,4,6 or 7 fry oil quality equipment it is characterised in that: described meter
When assembly (300) be liquid crystal digital display electronic watch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610689183.1A CN106370560B (en) | 2016-08-18 | 2016-08-18 | A kind of evaluation method and its equipment of Fast Evaluation frying oil quality |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610689183.1A CN106370560B (en) | 2016-08-18 | 2016-08-18 | A kind of evaluation method and its equipment of Fast Evaluation frying oil quality |
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| Publication Number | Publication Date |
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| CN106370560A true CN106370560A (en) | 2017-02-01 |
| CN106370560B CN106370560B (en) | 2019-01-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610689183.1A Active CN106370560B (en) | 2016-08-18 | 2016-08-18 | A kind of evaluation method and its equipment of Fast Evaluation frying oil quality |
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Cited By (1)
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| CN107389507A (en) * | 2017-06-05 | 2017-11-24 | 河北晨阳工贸集团有限公司 | A kind of true mineral varnish viscosity determining procedure |
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| CN107389507A (en) * | 2017-06-05 | 2017-11-24 | 河北晨阳工贸集团有限公司 | A kind of true mineral varnish viscosity determining procedure |
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| Publication number | Publication date |
|---|---|
| CN106370560B (en) | 2019-01-25 |
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