CN109425633A - A kind of heat shrinkage film shrinking percentage test method and test device - Google Patents
A kind of heat shrinkage film shrinking percentage test method and test device Download PDFInfo
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- CN109425633A CN109425633A CN201710790134.1A CN201710790134A CN109425633A CN 109425633 A CN109425633 A CN 109425633A CN 201710790134 A CN201710790134 A CN 201710790134A CN 109425633 A CN109425633 A CN 109425633A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/16—Investigating or analyzing materials by the use of thermal means by investigating thermal coefficient of expansion
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Abstract
The invention discloses a kind of heat shrinkage film shrinking percentage test methods, and steps are as follows: before S1, heating, the length for measuring film sample is film initial length L1；S2, the film sample is laid in the test device with accommodating cavity, the test device is placed in drying tunnel and is heated；S3, the test device taken out from the drying tunnel, is cooling, opening the test device, taking out the film sample, the length for recording the film sample at this time is length L after deformation of thin membrane2, according to film initial length L1, length L after deformation of thin membrane2, calculate in conjunction with the calculation formula of shrinking percentage the percent thermal shrinkage of film.When test, after heat shrinkage film is heated in accommodating cavity, deform according to the thermal contraction performance of itself, due to being limited by accommodating cavity height, heat shrinkage film remains formation state during heating, avoids heat shrinkage film and generates distortion, corrugation or deformation, can accurately measure heat shrinkage film shrinking percentage.
Description
Technical field
The present invention relates to thin film physics performance detection technical field more particularly to a kind of heat shrinkage film shrinking percentage test method and
Test device.
Background technique
Heat shrinkage film is a kind of orientation that is stretched in process of production, and the thermoplastic of heat shrinkable in use
Film.
Application No. is the Chinese invention patents of CN201410436758.X, provide a kind of dress of hot wind test shrinking percentage
It sets.The apparatus structure is simple, and tests shrinking percentage using Hot-blast Heating, including workbench, hot air apparatus, guide duct and for solid
Determine the clamping device of heat shrinkage film, hot air apparatus and guide duct are in turn secured to the top of workbench, one end of guide duct and hot wind
The air outlet of device is corresponding；It further include the heated air circulation device being set on the outside of the guide duct, the air inlet of heated air circulation device
Mouth is connected to the other end of the guide duct, and the air outlet of heated air circulation device is connected to the hot air apparatus, and clamping device can
Releasably it is connected in guide duct and is located at the junction of the other end of guide duct and the air inlet of heated air circulation device.But it should
Method measurement accuracy is low, and distortion, corrugation, deformation are easy in heating process, is difficult accurately to measure its size.
Application No. is the Chinese invention patents of CN201611225296.2, provide a kind of measurement side of film shrink rate
Method and measuring device.Before the measurement method includes: heating, the length for measuring film sample is film initial length L1；This is thin
Membrane sample is placed in heating equipment and heats；The film sample is taken out from heating equipment, is cooling, stretching the film sample makes it
In tensioning state, the length for recording the film sample at this time is length L after deformation of thin membrane2, according to film initial length L1, it is thin
Length L after film deformation2, calculate in conjunction with the calculation formula of shrinking percentage the percent thermal shrinkage of film.The measuring accuracy of the measurement method
Although high, it is not suitable for heat shrinkage film, because heat shrinkage film is hardened after shrinking completely, can not be tested with the method.Therefore, it is necessary to set
Count the test method and test device of suitable heat shrinkage film shrinking percentage.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of heat shrinkage film shrinking percentage test method, which can be quasi-
Really measurement heat shrinkage film shrinking percentage.
Another technical problem to be solved by the present invention is that providing a kind of heat shrinkage film shrinking percentage test device, which can
Accurately to measure heat shrinkage film shrinking percentage, structure is simple, practical and convenient.
In order to solve the above technical problems, technical solution provided by the invention are as follows:
A kind of heat shrinkage film shrinking percentage test method, steps are as follows:
Before S1, heating, the length for measuring film sample is film initial length L1；
S2, the film sample is laid in the test device with accommodating cavity, the test device is placed in drying tunnel
Interior heating；
S3, the test device is taken out from the drying tunnel, is cooling, opening the test device, take out the film
Sample, the length for recording the film sample at this time is length L after deformation of thin membrane2, according to film initial length L1, deformation of thin membrane
Length L afterwards2, calculate in conjunction with the calculation formula of shrinking percentage the percent thermal shrinkage of film.
Further, the height of the accommodating cavity is 10-20 μm higher than the thickness of the film sample.
A kind of heat shrinkage film shrinking percentage test device is encircled into including upper cover plate, lower cover plate and upper cover plate and lower cover plate 200
Accommodating chamber, for accommodating chamber for accommodating film sample, the height of accommodating chamber is 10-30 μm higher than the thickness of the film sample.
Further, the height of the accommodating chamber is 10-20 μm higher than the thickness of the film sample.
It further, further include the gasket being set between the upper cover plate and lower cover plate, the spacer cross section is ring
Shape, upper cover plate, lower cover plate and gasket are encircled into the accommodating chamber.
Further, the upper cover plate and lower cover plate respectively further comprise mutually matched upper protrusion and lower convexity, upper protrusion
Extend from upper cover plate to the direction of lower cover plate, direction of the lower convexity from lower cover plate to upper cover plate extends, upper protrusion and lower convexity button
When conjunction, upper cover plate and lower cover plate are encircled into the accommodating chamber.
Further, the upper cover plate and lower cover plate surfacing and be honeycomb.
Further, the upper cover plate and lower cover plate are made of hard heat-conducting metal.
Further, the gasket is made of heat-resisting material.
Further, the gasket is made of copper foil, aluminium foil or Kapton.
Beneficial effects of the present invention:
This test method can simulate the practical service environment of heat shrinkage film, and test result is close to using effect, testing precision
Height solves the problems, such as that measuring accuracy in the prior art is poor, result of test can not instruct actual use, substantially increases pyrocondensation
The measuring accuracy of film shrinking percentage.When test, after heat shrinkage film is heated in accommodating cavity, become according to the thermal contraction performance of itself
Shape, due to being limited by accommodating cavity height, heat shrinkage film remains formation state during heating, avoids heat shrinkage film production
Raw distortion, corrugation or deformation, can accurately measure heat shrinkage film shrinking percentage.When being tested using this test device, heat shrinkage film is heated
It afterwards in accommodating cavity, deforms according to the thermal contraction performance of itself, due to being limited by accommodating cavity height, heat shrinkage film is adding
Formation state is remained in thermal process, is avoided heat shrinkage film and is generated distortion, corrugation or deformation, can accurately measure heat shrinkage film receipts
Shrinkage.The test device can accurately measure heat shrinkage film shrinking percentage, and structure is simple, practical and convenient.
Detailed description of the invention
Fig. 1 is the flow chart of heat shrinkage film shrinking percentage test method in a preferred embodiment of the invention；
Fig. 2 is the inside top figure of heat shrinkage film shrinking percentage test device in a preferred embodiment of the invention；
Fig. 3 is the sectional view of heat shrinkage film shrinking percentage test device in a preferred embodiment of the invention；
Fig. 4 is the structural schematic diagram of upper cover plate or lower cover plate in a preferred embodiment of the invention；
Fig. 5 is the structural schematic diagram of gasket in a preferred embodiment of the invention；
Fig. 6 is the sectional view of heat shrinkage film shrinking percentage test device in another preferred embodiment of the present invention.
Specific embodiment
In order to which technical problems, technical solutions and advantages to be solved are more clearly understood, tie below
Accompanying drawings and embodiments are closed, the present invention will be described in further detail.It should be appreciated that specific embodiment described herein is only
To explain the present invention, it is not intended to limit the present invention.
Embodiment of the method 1
As shown in Figure 1, a kind of heat shrinkage film shrinking percentage test method, steps are as follows:
Before S1, heating, the length for measuring film sample is film initial length L1；
S2, the film sample is laid in the test device with accommodating cavity 300, the test device is placed in baking
It is heated in road；
S3, the test device is taken out from the drying tunnel, is cooling, opening the test device, take out the film
Sample, the length for recording the film sample at this time is length L after deformation of thin membrane2, according to film initial length L1, deformation of thin membrane
Length L afterwards2, calculate in conjunction with the calculation formula of shrinking percentage the percent thermal shrinkage of film.
Preferably, the height of accommodating cavity 300 described in step S2 is 10-30 μm higher than the thickness of the film sample.
This test method can simulate the practical service environment of heat shrinkage film, and test result is close to using effect, testing precision
Height solves the problems, such as that measuring accuracy in the prior art is poor, result of test can not instruct actual use, substantially increases pyrocondensation
The measuring accuracy of film shrinking percentage.When test, after heat shrinkage film is heated in accommodating cavity 300, occur according to the thermal contraction performance of itself
Deformation, due to being limited by 300 height of accommodating cavity, heat shrinkage film remains formation state during heating, avoids heat
Contracting film generates distortion, corrugation or deformation, can accurately measure heat shrinkage film shrinking percentage.Below to each step of the test method into
Row is described in detail.
Before S1, heating, the length for measuring film sample is film initial length L1.Film sample is cut into certain ruler
It is very little, utilize Quadratic Finite Element measuring instrument precise measurement size.In the present embodiment, film sample is cut into the pros that side length is 8cm
Shape, i.e. L1For 8cm.When heat shrinkage film is square, the measurement of the deformation size after facilitating heat shrinkage film to test, side length should not mistake
Greatly, excessive to may require that high equipment cost, it has not been convenient to test；Its side length is also unsuitable too small, and the too small measuring accuracy that will lead to is bad,
When its side length is 8-12cm, equipment cost is low, and measuring accuracy is high.
S2, the film sample is laid in the test device with accommodating cavity 300, the test device is placed in baking
It is heated in road.Drying tunnel is opened, setup test after temperature is increased to setting value and maintains to stablize in drying tunnel.Before test, by film
Sample is laid in the test device with accommodating cavity 300, and the size of film sample all directions should be less than the ruler of accommodating cavity 300
It is very little, in the present embodiment the height of accommodating cavity 300 than film sample thickness more than 30 μm.The excessive height of accommodating cavity 300, heat shrinkage film
It can be in the distortion of accommodating cavity 300, corrugation or deformation after heated；The height of accommodating cavity 300 is too low, can cause to squeeze to heat shrinkage film, make
It cannot deform according to the thermal contraction performance of itself, the height of accommodating cavity 300 than film sample thickness more than 10-30 μm
When, the precision highest of test.
The test device for being built-in with film sample is placed in drying tunnel and is heated, heating temperature is 120 DEG C, wind speed 9m/
S, time 10-30s.The too high or too low for temperature of heating device can all influence measuring accuracy, when the temperature of heating device is
At 120-200 DEG C, the precision of test is high, and precision is high.The stability and measuring accuracy that air speed influence is tested in drying tunnel, when in drying tunnel
When the wind speed of blowing is 6-12m/s, the precision of test is high, and stability is good.
S3, the test device is taken out from the drying tunnel, is cooling, opening the test device, take out the film
Sample, the length for recording the film sample at this time is length L after deformation of thin membrane2, according to film initial length L1, deformation of thin membrane
Length L afterwards2, calculate in conjunction with the calculation formula of shrinking percentage the percent thermal shrinkage of film.Using Quadratic Finite Element measuring instrument to test after
Heat shrinkage film carries out precise measurement, measures having a size of L2, by shrinking percentage formula δ=(L1-L2Shrinking percentage δ is calculated in)/100, will count
The shrinking percentage δ of calculation is compared with standard value, to judge whether the shrinking percentage of heat shrinkage film is qualified.
Embodiment of the method 2
The present embodiment is roughly the same with embodiment of the method 1, and difference is as detailed below.In the present embodiment, step S1 will be thin
Membrane sample cuts into the square that side length is 12cm, i.e. L1For 12cm, the height of accommodating cavity 300 is than film sample in step S2
Thickness is 20 μm more, and heating temperature is 200 DEG C, wind speed 12m/s.
Embodiment of the method 3
The present embodiment is roughly the same with embodiment of the method 1, and difference is as detailed below.In the present embodiment, step S1 will be thin
Membrane sample cuts into the square that side length is 10cm, i.e. L1For 10cm, the height of accommodating cavity 300 is than film sample in step S2
Thickness is 10 μm more, and heating temperature is 300 DEG C, wind speed 6m/s.
Installation practice 1
The heat shrinkage film shrinking percentage test device of above-mentioned test method can be used by present embodiments providing one kind, such as Fig. 2-3 institute
Show, including the accommodating chamber 300 that upper cover plate 100, lower cover plate 200 and upper cover plate 100 and lower cover plate 200 are encircled into, accommodating chamber 300 is used
In accommodating film sample, the height of accommodating chamber 300 is 10-30 μm higher than the thickness of the film sample.
When test, after heat shrinkage film is heated in accommodating cavity 300, deform according to the thermal contraction performance of itself, due to by
To the limitation of 300 height of accommodating cavity, heat shrinkage film remains formation state during heating, avoids heat shrinkage film and generates torsion
Bent, corrugation or deformation, can accurately measure heat shrinkage film shrinking percentage.The test device can accurately measure heat shrinkage film shrinking percentage, knot
Structure is simple, practical and convenient.Each component part is described in detail below.
Test device is integrally in hollow box-like, including upper cover plate 100, lower cover plate 200, accommodating chamber 300 and gasket 400.
Upper cover plate 100 and lower cover plate 200 are oppositely arranged, as shown in figure 4, upper cover plate 100 and lower cover plate 200 are plate, it is excellent
It is selected as shape identical with film sample shape, such as square.Upper cover plate 100 and 200 material of lower cover plate are the thermally conductive gold of hard
Belong to, such as stainless steel, surfacing and be honeycomb has heat-transfer rate fast, the characteristics of being heated evenly.
Gasket 400 is provided between upper cover plate 100 and lower cover plate 200, upper cover plate 100, lower cover plate 200 and gasket 400 close
Surround the accommodating chamber 300.400 cross section of gasket is ring-type, and as described in Figure 5, the cross section of gasket 400 is that two squares are mutual
Be nested the ring-type to be formed.Gasket 400 is also possible to other cyclic structures, and the shape of inner ring and outer rings can be the same or different,
Inner ring or outer ring can be round, square or triangular structures.Gasket 400 is resistance to by copper foil, aluminium foil or Kapton etc.
High-temperature material is made.
Accommodating chamber 300 is for accommodating film sample, and deformation occurs in accommodating chamber 300 after film sample is heated, accommodating cavity
300 excessive height, can be in the distortion of accommodating cavity 300, corrugation or deformation after heat shrinkage film is heated；The height of accommodating cavity 300 is too low, meeting
Heat shrinkage film is caused to squeeze, prevents it from deforming according to the thermal contraction performance of itself.The height of accommodating cavity 300 is than film sample
When the thickness of product is 10-30 μm more, the precision highest of test, it is further preferred that thickness of the height of accommodating cavity 300 than film sample
It is 10-20 μm high.
The present embodiment passes through the gasket 400 of replacement different height, and the height of adjustable accommodating chamber 300 makes accommodating chamber 300
Adapt to the film sample of different-thickness.
Upper cover plate 100, lower cover plate 200 and gasket 400 are detachably connected by fastener 220, and fastener 220 can make spiral shell
Nail, pin or buckle structure.
Installation practice 2
The present embodiment is roughly the same with Installation practice 1, the difference is that, there is no gasket 400 in the present embodiment, but
Gasket 400 is replaced with raised 110 and lower convexity 210.Specifically, as shown in figure 5, upper raised 110 and lower convexity 210 set respectively
It sets at the edge of upper cover plate 100 and lower cover plate 200, is adapted with the shape of upper cover plate 100 and lower cover plate 200.Upper raised 110 from
Upper cover plate 100 extends to the direction of lower cover plate 200, and lower convexity 210 extends from lower cover plate 200 to the direction of upper cover plate 100, convex
When playing 110 and the fastening of lower convexity 210, upper cover plate 100 and lower cover plate 200 are encircled into accommodating chamber 300.
The above is only a preferred embodiment of the present invention, for those of ordinary skill in the art, according to the present invention
Thought, in specific embodiments and applications can be with many changes may be made, as long as these variations are without departing from structure of the invention
Think, all belongs to the scope of protection of the present invention.
Claims (10)
1. a kind of heat shrinkage film shrinking percentage test method, which is characterized in that steps are as follows:
Before S1, heating, the length for measuring film sample is film initial length L1；
S2, the film sample is laid in the test device with accommodating cavity, the test device is placed in drying tunnel and is added
Heat；
S3, the test device is taken out from the drying tunnel, is cooling, opening the test device, take out the film sample,
The length for recording the film sample at this time is length L after deformation of thin membrane2, according to film initial length L1, length after deformation of thin membrane
L2, calculate in conjunction with the calculation formula of shrinking percentage the percent thermal shrinkage of film.
2. heat shrinkage film shrinking percentage test method according to claim 1, which is characterized in that the height ratio of the accommodating cavity
The thickness of the film sample is 10-20 μm high.
3. a kind of heat shrinkage film shrinking percentage test device, which is characterized in that including upper cover plate (100), lower cover plate (200) and upper cover plate
(100) accommodating chamber (300) being encircled into lower cover plate (200), accommodating chamber (300) is for accommodating film sample, accommodating chamber (300)
Height it is 10-30 μm higher than the thickness of the film sample.
4. heat shrinkage film shrinking percentage test device according to claim 3, which is characterized in that the accommodating chamber (300)
Height is 10-20 μm higher than the thickness of the film sample.
5. heat shrinkage film shrinking percentage test device according to claim 3, which is characterized in that further include being set on described
Gasket (400) between cover board (100) and lower cover plate (200), gasket (400) cross section be ring-type, upper cover plate (100),
Lower cover plate (200) and gasket (400) are encircled into the accommodating chamber (300).
6. heat shrinkage film shrinking percentage test device according to claim 3, which is characterized in that the upper cover plate (100) and
Lower cover plate (200) respectively further comprises mutually matched raised (110) and lower convexity (210), and upper raised (110) are from upper cover plate
(100) extending to the direction of lower cover plate (200), lower convexity (210) extends from lower cover plate (200) to the direction of upper cover plate (100),
When upper protrusion (110) and lower convexity (210) fasten, upper cover plate (100) and lower cover plate (200) are encircled into the accommodating chamber (300).
7. heat shrinkage film shrinking percentage test device according to claim 3, which is characterized in that the upper cover plate (100) and
Lower cover plate (200) surfacing and be honeycomb.
8. heat shrinkage film shrinking percentage test device according to claim 3, which is characterized in that the upper cover plate (100) and
Lower cover plate (200) is made of hard heat-conducting metal.
9. heat shrinkage film shrinking percentage test device according to claim 5, which is characterized in that the gasket (400) is by resistance to
High-temperature material is made.
10. heat shrinkage film shrinking percentage test device according to claim 5, which is characterized in that the gasket (400) is by copper
Foil, aluminium foil or Kapton are made.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710790134.1A CN109425633A (en) | 2017-09-04 | 2017-09-04 | A kind of heat shrinkage film shrinking percentage test method and test device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710790134.1A CN109425633A (en) | 2017-09-04 | 2017-09-04 | A kind of heat shrinkage film shrinking percentage test method and test device |
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Cited By (2)
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| CN110672823A (en) * | 2019-10-24 | 2020-01-10 | 江苏赛诺格兰医疗科技有限公司 | Method and tool for testing shrinkage rate of silica gel |
| CN111398531A (en) * | 2020-04-07 | 2020-07-10 | 苏州鸿凌达电子科技有限公司 | Efficient graphene film identification system and method |
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| CN111398531A (en) * | 2020-04-07 | 2020-07-10 | 苏州鸿凌达电子科技有限公司 | Efficient graphene film identification system and method |
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