CN106840538B - A method of vacuum bag film air leakage point is detected using pressure-sensitive substance - Google Patents
A method of vacuum bag film air leakage point is detected using pressure-sensitive substance Download PDFInfo
- Publication number
- CN106840538B CN106840538B CN201710233230.6A CN201710233230A CN106840538B CN 106840538 B CN106840538 B CN 106840538B CN 201710233230 A CN201710233230 A CN 201710233230A CN 106840538 B CN106840538 B CN 106840538B
- Authority
- CN
- China
- Prior art keywords
- pressure
- vacuum bag
- bag film
- sensitive substance
- air leakage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
- G01M3/20—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material
Abstract
The present invention relates to a kind of methods using pressure-sensitive substance detection vacuum bag film air leakage point, pressure-sensitive substance is added in vacuum bag film, then it adjusts the pressure difference inside and outside vacuum bag film and is more than or equal to critical pressure, the not changed point of the color observed is air leakage point, wherein critical pressure is the pressure for instigating pressure-sensitive substance that color change takes place, pressure-sensitive substance is the polymer containing spiro-pyrans, its degree of polymerization >=5, the present invention can be according to the variation of vacuum bag film ambient pressure, automatically the air-tightness of itself is detected, largely use manpower and material resources sparingly, accurately rapidly find out the place of gas leakage, remedial measure is made in time, guarantee the briquetting pressure of composite element, save production cost, improve production efficiency, with industrialization promotion advantage.
Description
Technical field
The invention belongs to the air-leakage test fields of vacuum bag film, are related to a kind of utilization pressure-sensitive substance detection vacuum
The method of bag film air leakage point.
Background technique
Demand with composite element in fields such as aerospace, ship, trains is increasing, forms to it
The performance requirement of used auxiliary material is also higher in journey.Vacuum bag film is using autoclave molding or vacuum assisted resin infusion system
A kind of vacuum aided material of standby composite element, it together with sealant tape for composite material provide one it is vacuum-tight
Environment is compacted component by vacuumizing, and guarantees briquetting pressure.However in the production process of vacuum bag film, it is easy to
There is trachoma, trachoma can not with the naked eye be observed, so vacuum bag film is easy to out in the manufacturing process of composite element
Phenomena such as existing gas leakage, quick-fried bag, lead to that internal soundness defect occurs in the composite element after solidifying or dry spot, poor occurs in surface
Phenomena such as glue, influences product quality.Therefore, the air-tightness of vacuum bag film is studied, it is ensured that it does not leak air in use
Phenomenon has very important realistic meaning.
When manufacturing large-scale composite material component, the airtight of vacuum bag film is checked through the method frequently with manual inspection
Property, judge by pressure maintaining situation vacuum bag film whether gas leakage, but find out the place of gas leakage but relatively hard not only time-consuming expense
Power, and it is unable to reach satisfied detection effect.
Wang Weishan etc. (two methods of scientific and technological [J] the gas permeability test of Wang Weishan, Zhao Jiang food industry compare,
2008, (29): 283-284) describe vacuum bag film air-leakage test two methods, mainly pressure differential method and equal-pressure method.
Equal-pressure method mainly utilizes sensor, and the air-leakage test for oxygen is tested, and permeation chamber is divided into two relatively using sample
Independent air flow system, side are the dry test gas (oxygen or the mixed gas containing oxygen) of flowing, and the other side is flowing
Dry gas (nitrogen), sample both sides pressure is equal, but oxygen partial pressure is different.Under the action of oxygen partial pressure, oxygen is penetrated
Film is simultaneously sent by stream of nitrogen gas into sensor, and the amount of oxygen carried in stream of nitrogen gas is accurately measured by sensor, thus
Film but can not obtain film for the gas permeability of other gases in air, using having limitation for the gas permeability of oxygen out
Property；Pressure differential method is that permeation chamber is divided into two independent spaces using sample, first sample two sides is all evacuated, then to it
The test gas of 0.1MPa is poured in middle side, and the other side then continues to keep vacuum state.0.1MPa is formed in sample two sides
Test gas draught head, test gas enters low-pressure side through film, and causes the variable quantity of gas low pressure lateral pressure,
The variation that low-pressure lateral pressure is measured by high-precision manometer, detects the air-tightness of vacuum bag film, and pressure differential method has for surveying
Gas testing body is not influenced without selectivity, test result by foreign gas, and, success of the test rate height low with testing cost, but
The position that film leaks air can not be accurately tested out, makes remedial measure in time.
Therefore, the air-tightness of vacuum bag film can accurately be detected by inventing one kind, and can rapidly find out the place of gas leakage,
The method for making remedial measure in time is of great significance.
Summary of the invention
The purpose of the invention is to overcome the prior art that cannot accurately detect air leakage point, a kind of utilize is provided and is pressed
The method that power responsive type substance detects vacuum bag film air leakage point is added pressure-sensitive substance in vacuum bag film, then constantly increases
Pressure difference inside and outside big vacuum bag film, color change can occur for vacuum bag film under pressure, at air leakage point due to
Atmosphere communicates, the power that is not pressurized effect, because the inspection of air leakage point can be realized by observing color change without color change occurs
It surveys.
In order to achieve the above objectives, the technical solution adopted by the present invention are as follows:
A method of vacuum bag film air leakage point being detected using pressure-sensitive substance, pressure-sensitive substance is added to
In vacuum bag film, then adjusts the pressure difference inside and outside vacuum bag film and be more than or equal to critical pressure, the color observed is not sent out
The point for changing is air leakage point；
The critical pressure is the pressure for instigating pressure-sensitive substance that color change takes place, and the color change exists
In naked eyes visible range.
As a preferred technical scheme:
A kind of method using pressure-sensitive substance detection vacuum bag film air leakage point as described above, the vacuum bag film
For monofilm or multilayer film, wherein multilayer film is the film of the number of plies >=2.
A kind of method using pressure-sensitive substance detection vacuum bag film air leakage point as described above, the presser sensor
Type substance is dispersed in any in one or more layers of vacuum bag film.
A kind of method using pressure-sensitive substance detection vacuum bag film air leakage point as described above, contains presser sensor
The content of pressure-sensitive substance is 0.1~5wt% in the film layer of type substance, and the content of pressure-sensitive substance is too low, color
Change unobvious, content is too high, will affect the physical property of vacuum bag film.
A kind of method using pressure-sensitive substance detection vacuum bag film air leakage point as described above, by pressure-sensitive
Substance is added to the method in vacuum bag film are as follows: is blended to obtain grain with the beads fuse of vacuum bag film by pressure-sensitive substance
Material, the pellet for then obtaining melt blending directly extrude or multi-layer co-extruded compound with the pellet of vacuum bag film.
A kind of method using pressure-sensitive substance detection vacuum bag film air leakage point as described above, the adjusting vacuum
Pressure difference inside and outside bag film is using the method for vacuumizing or being pressed into gas.
A kind of method using pressure-sensitive substance detection vacuum bag film air leakage point as described above, the critical pressure
For 0.06~0.1MPa.
A kind of method using pressure-sensitive substance detection vacuum bag film air leakage point as described above, the presser sensor
Type substance is the polymer containing spiro-pyrans.
A kind of method using pressure-sensitive substance detection vacuum bag film air leakage point as described above, it is described to contain spiro-pyrans
Polymer structural formula it is as follows:
In formula, n represents the degree of polymerization of the polymer containing spiro-pyrans, n >=5.
A kind of method using pressure-sensitive substance detection vacuum bag film air leakage point as described above, the color change
Referring to from light yellow becomes aubergine.
Reaction mechanism:
Polymer containing spiro-pyrans is pressure-sensitive substance, when the pressure that it is born is lower than critical pressure, face
Color be it is light yellow, when the pressure that it is born be optionally greater than critical pressure when, color be aubergine, Discoloration mechanism such as following formula
It is shown:
F representative pressure in formula；
The present invention is that there are difference according to gas leakage and gastight local compression situation, and pyrrole containing spiral shell is added in vacuum bag film
The polymer muttered realizes gas leakage self-checking function.Piezallochromy substance is added in vacuum bag film, once vacuum bag film gas leakage, leakage
Because not being pressurized power effect, color does not change in the place of gas.And the gastight local effect because of by vacuum pressure,
Color changes, and can rapidly find out the place of gas leakage, make remedial measure in time.
The utility model has the advantages that
(1) present invention is a kind of method using the detection vacuum bag film gas leakage of piezallochromy substance, and vacuum bag film being capable of root
According to the variation of vacuum bag film ambient pressure, the air-tightness of itself is detected automatically, largely saves man power and material；
(2) present invention be it is a kind of using piezallochromy substance detection vacuum bag film gas leakage method, overall flow length and
Technique controlling difficulty is moderate, has high efficiency；
(3) present invention be it is a kind of using piezallochromy substance detection vacuum bag film gas leakage method can accurately rapidly find out
The place of gas leakage, makes remedial measure in time, guarantees the briquetting pressure of composite element, saves production cost, improves production
Efficiency has industrialization promotion advantage.
Specific embodiment
The invention will be further elucidated with reference to specific embodiments.It should be understood that these embodiments are merely to illustrate this hair
It is bright rather than limit the scope of the invention.In addition, it should also be understood that, after reading the content taught by the present invention, art technology
Personnel can make various changes or modifications the present invention, and such equivalent forms equally fall within the application the appended claims and limited
Fixed range.
Embodiment 1
A method of vacuum bag film air leakage point being detected using pressure-sensitive substance, its step are as follows:
(1) it is blended the polymer containing spiro-pyrans that the degree of polymerization is 5 to obtain pellet with the beads fuse of vacuum bag film, then
The pellet that melt blending is obtained directly extrudes obtained vacuum bag monofilm, and the polymer containing spiro-pyrans is dispersed in vacuum bag
In monofilm, the content of the polymer in vacuum bag monofilm containing spiro-pyrans is 5wt%, which opens
Beginning to change, to need the pressure that applies be 0.06MPa, and the structural formula for containing the polymer of spiro-pyrans is as follows:
(2) adjusting the pressure difference inside and outside vacuum bag film by the method vacuumized is 0.06MPa, observes vacuum bag film
Whether color change is had, and air tight position should become aubergine from light yellow, and Gas leak position with the other side due to being connected to, pressure
It is smaller, color be still in it is faint yellow, that is, the not changed point of the color observed is air leakage point.
Embodiment 2
A method of vacuum bag film air leakage point being detected using pressure-sensitive substance, its step are as follows:
(1) it is blended the polymer containing spiro-pyrans that the degree of polymerization is 6 to obtain pellet with the beads fuse of vacuum bag film, then
The pellet that melt blending is obtained directly extrudes obtained vacuum bag monofilm, and the polymer containing spiro-pyrans is dispersed in vacuum bag
In monofilm, the content of the polymer in vacuum bag monofilm containing spiro-pyrans is 0.1wt%, this contains the polymer color of spiro-pyrans
It is 0.1MPa that the pressure that variation needs to apply, which takes place, and the structural formula for containing the polymer of spiro-pyrans is as follows:
(2) adjusting the pressure difference inside and outside vacuum bag film by the method for indentation gas is 0.1MPa, observes vacuum bag
Whether film has color change, and air tight position should become aubergine from light yellow, and Gas leak position is pressed due to being connected to the other side
Power is smaller, color be still in it is faint yellow, that is, the not changed point of the color observed is air leakage point.
Embodiment 3
A method of vacuum bag film air leakage point being detected using pressure-sensitive substance, its step are as follows:
(1) it is blended the polymer containing spiro-pyrans that the degree of polymerization is 7 to obtain pellet with the beads fuse of vacuum bag film, then
The three-layer co-extruded compound obtained vacuum bag trilamellar membrane out of the pellet of pellet and vacuum bag film that melt blending is obtained, containing spiro-pyrans
Polymer is dispersed in the middle layer of vacuum bag trilamellar membrane, and the content of the polymer containing spiro-pyrans is in middle layer
2.55wt%, it is 0.08MPa which, which takes place the pressure that variation needs to apply, this contains spiro-pyrans
Polymer structural formula it is as follows:
(2) adjusting the pressure difference inside and outside vacuum bag film by the method for indentation gas is 0.1MPa, observes vacuum bag
Whether film has color change, and air tight position should become aubergine from light yellow, and Gas leak position is pressed due to being connected to the other side
Power is smaller, color be still in it is faint yellow, that is, the not changed point of the color observed is air leakage point.
Embodiment 4
A method of vacuum bag film air leakage point being detected using pressure-sensitive substance, its step are as follows:
(1) it is blended the polymer containing spiro-pyrans that the degree of polymerization is 8 to obtain pellet with the beads fuse of vacuum bag film, then
It is coextruded compound obtained vacuum bag duplicature by two layers of pellet of pellet and vacuum bag film that melt blending obtains, containing spiro-pyrans
Polymer is dispersed in the layer of vacuum bag film, and the content of the polymer in layer containing spiro-pyrans is 2.7wt%, should
It is 0.08MPa that the pressure that variation needs to apply, which takes place, in polymer color containing spiro-pyrans, this contains the polymer of spiro-pyrans
Structural formula is as follows:
(2) adjusting the pressure difference inside and outside vacuum bag film by the method for indentation gas is 0.1MPa, observes vacuum bag
Whether film has color change, and air tight position should become aubergine from light yellow, and Gas leak position is pressed due to being connected to the other side
Power is smaller, color be still in it is faint yellow, that is, the not changed point of the color observed is air leakage point.
Embodiment 5
A method of vacuum bag film air leakage point being detected using pressure-sensitive substance, its step are as follows:
(1) it is blended the polymer containing spiro-pyrans that the degree of polymerization is 9 to obtain pellet with the beads fuse of vacuum bag film, then
The pellet that melt blending is obtained and four layers of the pellet of vacuum bag film compound obtained four tunic of vacuum bag of coextrusion, containing spiro-pyrans
Polymer is dispersed in the upper epidermis of vacuum bag film, and the content of the polymer in upper epidermis containing spiro-pyrans is 0.5wt%, should
It is 0.1MPa that the pressure that variation needs to apply, which takes place, in the color of polymer containing spiro-pyrans, this contains the polymer of spiro-pyrans
Structural formula is as follows:
(2) adjusting the pressure difference inside and outside vacuum bag film by the method for indentation gas is 0.1MPa, observes vacuum bag
Whether film has color change, and air tight position should become aubergine from light yellow, and Gas leak position is pressed due to being connected to the other side
Power is smaller, color be still in it is faint yellow, that is, the not changed point of the color observed is air leakage point.
Embodiment 6
A method of vacuum bag film air leakage point being detected using pressure-sensitive substance, its step are as follows:
(1) it is blended the polymer containing spiro-pyrans that the degree of polymerization is 6 to obtain pellet with the beads fuse of vacuum bag film, then
The pellet that melt blending is obtained directly extrudes obtained vacuum bag monofilm, and the polymer containing spiro-pyrans is dispersed in vacuum bag
In monofilm, the content of the polymer in monofilm containing spiro-pyrans is 2.9wt%, which starts to send out
The pressure that changing needs to apply is 0.08MPa, and the structural formula for containing the polymer of spiro-pyrans is as follows:
(2) adjusting the pressure difference inside and outside vacuum bag film by the method vacuumized is 0.08MPa, observes vacuum bag film
Whether color change is had, and air tight position should become aubergine from light yellow, and Gas leak position with the other side due to being connected to, pressure
It is smaller, color be still in it is faint yellow, that is, the not changed point of the color observed is air leakage point.
Embodiment 7
A method of vacuum bag film air leakage point being detected using pressure-sensitive substance, its step are as follows:
(1) it is blended the polymer containing spiro-pyrans that the degree of polymerization is 10 to obtain pellet with the beads fuse of vacuum bag film, so
The three-layer co-extruded compound obtained vacuum bag trilamellar membrane out of the pellet of melt blending is obtained afterwards pellet and vacuum bag film, contains spiro-pyrans
Polymer be dispersed in the middle layer of vacuum bag film, the content of the polymer in middle layer containing spiro-pyrans is 4.9wt%,
It is 0.06MPa that the pressure that variation needs to apply, which takes place, in the polymer color containing spiro-pyrans, this contains the polymer of spiro-pyrans
Structural formula it is as follows:
(2) adjusting the pressure difference inside and outside vacuum bag film by the method for indentation gas is 0.12MPa, observes vacuum bag
Whether film has color change, and air tight position should become aubergine from light yellow, and Gas leak position is pressed due to being connected to the other side
Power is smaller, color be still in it is faint yellow, that is, the not changed point of the color observed is air leakage point.
Embodiment 8
A method of vacuum bag film air leakage point being detected using pressure-sensitive substance, its step are as follows:
(1) it is blended the polymer containing spiro-pyrans that the degree of polymerization is 5 to obtain pellet with the beads fuse of vacuum bag film, then
The three-layer co-extruded compound obtained vacuum bag trilamellar membrane out of the pellet of pellet and vacuum bag film that melt blending is obtained, containing spiro-pyrans
Polymer is dispersed in the upper epidermis and layer of vacuum bag film, the polymer in upper epidermis and layer containing spiro-pyrans
Content is all 3wt%, and it is 0.08MPa which, which takes place the pressure that variation needs to apply, this contains
The structural formula of the polymer of spiro-pyrans is as follows:
(2) adjusting the pressure difference inside and outside vacuum bag film by the method for indentation gas is 0.12MPa, observes vacuum bag
Whether film has color change, and air tight position should become aubergine from light yellow, and Gas leak position is pressed due to being connected to the other side
Power is smaller, color be still in it is faint yellow, that is, the not changed point of the color observed is air leakage point.
Embodiment 9
A method of vacuum bag film air leakage point being detected using pressure-sensitive substance, its step are as follows:
(1) it is blended the polymer containing spiro-pyrans that the degree of polymerization is 13 to obtain pellet with the beads fuse of vacuum bag film, so
The pellet five-layer co-squeezing of the pellet that melt blending obtains and vacuum bag film is gone out into compound five tunic of obtained vacuum bag afterwards, contains spiro-pyrans
Polymer be dispersed in the third layer of vacuum bag film, the content of the polymer in third layer containing spiro-pyrans is 3.2wt%,
It is 0.07MPa that the pressure that variation needs to apply, which takes place, in the polymer color containing spiro-pyrans, this contains the polymer of spiro-pyrans
Structural formula it is as follows:
(2) adjusting the pressure difference inside and outside vacuum bag film by the method vacuumized is 0.08MPa, observes vacuum bag film
Whether color change is had, and air tight position should become aubergine from light yellow, and Gas leak position with the other side due to being connected to, pressure
It is smaller, color be still in it is faint yellow, that is, the not changed point of the color observed is air leakage point.
Embodiment 10
A method of vacuum bag film air leakage point being detected using pressure-sensitive substance, its step are as follows:
(1) it is blended the polymer containing spiro-pyrans that the degree of polymerization is 6 to obtain pellet with the beads fuse of vacuum bag film, then
Four layers of pellet compound obtained four tunic of vacuum bag of coextrusion of the pellet vacuum bag film that melt blending is obtained, it is poly- containing spiro-pyrans
It closes object to be dispersed in the upper epidermis and time upper epidermis of vacuum bag film, the polymer containing spiro-pyrans in upper epidermis and time upper epidermis
Content be all 1wt%, it is 0.09MPa which, which takes place variation to need the pressure that applies, should
The structural formula of polymer containing spiro-pyrans is as follows:
(2) adjusting the pressure difference inside and outside vacuum bag film by the method for indentation gas is 0.1MPa, observes vacuum bag
Whether film has color change, and air tight position should become aubergine from light yellow, and Gas leak position is pressed due to being connected to the other side
Power is smaller, color be still in it is faint yellow, that is, the not changed point of the color observed is air leakage point.
Claims (8)
1. a kind of method using pressure-sensitive substance detection vacuum bag film air leakage point, it is characterized in that: by pressure-sensitive object
Matter is added in vacuum bag film, is then adjusted the pressure difference inside and outside vacuum bag film and is more than or equal to critical pressure, observes
The not changed point of color is air leakage point；
The critical pressure is the pressure for instigating pressure-sensitive substance that color change takes place, and the color change is in naked eyes
In visible range；
The pressure-sensitive substance is the polymer containing spiro-pyrans；The structural formula of the polymer containing spiro-pyrans is as follows:
In formula, n represents the degree of polymerization of the polymer containing spiro-pyrans, n >=5.
2. a kind of method using pressure-sensitive substance detection vacuum bag film air leakage point according to claim 1, special
Sign is that the vacuum bag film is monofilm or multilayer film, and wherein multilayer film is the film of the number of plies >=2.
3. a kind of method using pressure-sensitive substance detection vacuum bag film air leakage point according to claim 2, special
Sign is, the pressure-sensitive substance is dispersed in any in one or more layers of vacuum bag film.
4. a kind of method using pressure-sensitive substance detection vacuum bag film air leakage point according to claim 3, special
Sign is that the content of pressure-sensitive substance is 0.1~5wt% in the film layer containing pressure-sensitive substance.
5. a kind of pressure-sensitive substance detection vacuum bag film air leakage point is utilized according to any one of claims 1 to 4
Method, which is characterized in that the method being added to pressure-sensitive substance in vacuum bag film are as follows: by pressure-sensitive substance and very
The beads fuse of empty bag film is blended to obtain pellet, the pellet for then obtaining melt blending directly extrude or with vacuum bag film
Pellet is multi-layer co-extruded compound.
6. a kind of method using pressure-sensitive substance detection vacuum bag film air leakage point according to claim 1, special
Sign is that the pressure difference adjusted inside and outside vacuum bag film is using the method for vacuumizing or being pressed into gas.
7. a kind of method using pressure-sensitive substance detection vacuum bag film air leakage point according to claim 1, special
Sign is that the critical pressure is 0.06~0.1MPa.
8. a kind of method using pressure-sensitive substance detection vacuum bag film air leakage point according to claim 1, special
Sign is that the color change, which refers to from light yellow, becomes aubergine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710233230.6A CN106840538B (en) | 2017-04-11 | 2017-04-11 | A method of vacuum bag film air leakage point is detected using pressure-sensitive substance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710233230.6A CN106840538B (en) | 2017-04-11 | 2017-04-11 | A method of vacuum bag film air leakage point is detected using pressure-sensitive substance |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106840538A CN106840538A (en) | 2017-06-13 |
| CN106840538B true CN106840538B (en) | 2019-03-01 |
Family
ID=59146615
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710233230.6A Active CN106840538B (en) | 2017-04-11 | 2017-04-11 | A method of vacuum bag film air leakage point is detected using pressure-sensitive substance |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106840538B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109540405B (en) * | 2018-11-07 | 2021-02-02 | 昌河飞机工业（集团）有限责任公司 | Air leakage testing method for composite material forming die |
| CN113670542A (en) * | 2021-09-18 | 2021-11-19 | 山东双一科技股份有限公司 | Method for detecting air leakage point position of vacuum bag of blade mould and system applied by method |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5501945A (en) * | 1994-08-30 | 1996-03-26 | The University Of Akron | Method of using multichromic polymers in packaging |
| EP1533270A1 (en) * | 2003-11-21 | 2005-05-25 | Asulab S.A. | Method to test the hermeticity of a sealed cavity micromechanical device and the device to be so tested |
| JP4986749B2 (en) * | 2007-07-09 | 2012-07-25 | 富士フイルム株式会社 | Material for pressure measurement |
| US9534977B2 (en) * | 2014-08-20 | 2017-01-03 | Empire Technology Development Llc | Intraluminal pressure detection for diverticular disease |
| US20160178057A1 (en) * | 2014-12-22 | 2016-06-23 | Caterpillar Inc. | Apparatus and method for providing a visual indication of seal integrity |
| CN205364579U (en) * | 2016-01-19 | 2016-07-06 | 洛阳双瑞风电叶片有限公司 | Combined material priming by vacuum leakage detecting device |
-
2017
- 2017-04-11 CN CN201710233230.6A patent/CN106840538B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN106840538A (en) | 2017-06-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104880394B (en) | A kind of concrete air infiltration test equipment and its method of testing | |
| CN101498642B (en) | Accurate tester for sorbent and method thereof | |
| CN101865754B (en) | Method for detecting gas tightness of composite material laminated plate | |
| CN106840538B (en) | A method of vacuum bag film air leakage point is detected using pressure-sensitive substance | |
| CN102445312B (en) | Testing apparatus for plastic airtightness and method thereof | |
| CN202404003U (en) | Gas permeability testing device | |
| US9746411B2 (en) | Apparatus and method for evaluating gas barrier properties | |
| CN106153522B (en) | Core porosity measuring device and measuring method | |
| CN101275893A (en) | Method and apparatus for measuring bamboo lignum permeability | |
| CN103913279A (en) | Method and device for testing leakproofness of oil cooler by mixing helium and air | |
| CN106525683B (en) | A kind of film permeation rate measuring device and measurement method | |
| CN202372338U (en) | Breathing valve calibrating table | |
| CN202886148U (en) | Sampling collector of organic volatile matters in product/sample | |
| CN103123309B (en) | Pressurization system used for detecting internal-pressure resistance of ceramic tube | |
| CN114324108A (en) | Internally-inserted pipeline gas permeation detection device and operation method | |
| CN101949814A (en) | Method for measuring methane permeability of marsh gas storage membrane | |
| CN101344451A (en) | Air tightness detection system and method for alloy wheel rim | |
| CN202854017U (en) | Oxygen permeability testing device based on equal-pressure method | |
| CN102798586B (en) | Novel testing system for testing air permeability of micro air-permeable film | |
| CN110252153A (en) | A kind of preparation method and application of the ultra-thin COF/GO film of controllable separating property | |
| CN205785703U (en) | A kind of method of cumulative scale leak detection system | |
| CN206168252U (en) | Low temperature membrane separation device capability test system | |
| CN110618074B (en) | Pneumatic wave type double-chamber fabric bulging and air-tightness synchronous measurement device and method | |
| CN107014569B (en) | Method for detecting air leakage point of multilayer vacuum bag film by using oxygen sensitive material | |
| CN201387413Y (en) | Adsorbent precision tester |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |