CN110360980B - Thin film material thermal deformation testing method and testing device - Google Patents
Thin film material thermal deformation testing method and testing device Download PDFInfo
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- CN110360980B CN110360980B CN201910701762.7A CN201910701762A CN110360980B CN 110360980 B CN110360980 B CN 110360980B CN 201910701762 A CN201910701762 A CN 201910701762A CN 110360980 B CN110360980 B CN 110360980B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/32—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring the deformation in a solid
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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
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Abstract
The invention discloses a method and a device for testing thermal deformation of a thin film material. The thermal deformation testing method of the film material comprises the following steps: s1, providing a film to be cut, cutting the film within the edge of the film to be cut to form two mutually perpendicular cutting lines, so as to obtain a film sample, wherein the distance from the intersection point of the two cutting lines to the end point of each cutting line is equal, and the middle part of the film sample after cutting has four vertex angles; s2, placing the film sample into an oven, raising the temperature to T, and taking out the film sample after the film sample is placed for time T; and S3, placing the film sample taken out in the step S2 on a horizontal plane, enabling the edge of the film sample to be attached to the horizontal plane, and measuring the vertical distance between the vertex of each vertex angle and the horizontal plane.
Description
Technical Field
The invention relates to the technical field of thin film material thermal deformation testing, in particular to a thin film material thermal deformation testing method and a thin film material thermal deformation testing device.
Background
The polymer material can maintain a predetermined shape in a certain temperature range, but when the temperature is in the vicinity of the softening point, the molecular chain changes, and further, the molecular chain deforms. The heat distortion temperature testing method is a measurement for measuring the heat resistance of high polymer materials, namely a common heat distortion temperature testing method. Another method for measuring the heat resistance of the high polymer material is the Vicat softening temperature, which is the temperature when a sample is pressed into a liquid heat transfer medium by a pressing needle with the thickness of 1 square millimeter under the conditions of certain load and certain constant temperature rise, and the corresponding national standard is GB/T1633-2000. Both the heat distortion temperature and the Vicat softening point test can only measure the heat distortion temperature of the film material, but cannot measure the deformation of the film material.
In the film product, a multi-layer composite product is generally used, and the processing and laminating process of the product is set according to the type and the frequency of the composite material, the type of the used composite glue and the like. Knowing the refractory temperature of the material can dictate in the process setup. However, during processing, the deformation of the material in the feeding direction and the normal direction thereof affects the quality of the processed product, for example, the film material has excessive thermal deformation, which may cause wrinkles, deformation, etc. during lamination, so to ensure the quality of the processed product, it is necessary to know the deformation after heating, and therefore, it is necessary to develop a testing apparatus and a testing method for testing the thermal deformation of the film material.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a method and a device for testing the thermal deformation of a thin film material, which are used for measuring the deformation of the thin film material.
According to one aspect of the present invention, there is provided a method for testing thermal deformation of a thin film material, comprising the steps of:
s1, providing a film to be cut, cutting the film to be cut in the edge of the film to be cut to form two cutting lines which are perpendicular to each other, so as to obtain a film sample, wherein the distance from the intersection point of the two cutting lines to the end point of each cutting line is equal, and the middle part of the cut film sample has four vertex angles;
s2, placing the film sample into an oven, raising the temperature to T, and taking out the film sample after the film sample is placed for time T;
s3, placing the film sample taken out in the step S2 on a horizontal plane, attaching the edge of the film sample to the horizontal plane, and measuring the vertical distance between the vertex of each vertex angle and the horizontal plane.
In some of these embodiments, the step S1 includes the following steps:
s11, providing the film to be cut and a cutting die, wherein two mutually perpendicular cutting grooves are formed in the edge of the cutting die, the cutting grooves penetrate through the cutting die, and the distance from the intersection point of the two cutting grooves to the end point of each cutting groove is equal;
s12, placing the film to be cut between a plane and the cutting die, so that the two cutting grooves are opposite to the area inside the edge of the film to be cut, and the included angle between the cutting line and the film to be cut in the longitudinal direction or the transverse direction is 45 degrees;
and S13, inserting a blade into the cutting groove, and moving the blade along the cutting groove, so as to form two cutting lines on the film to be cut, thereby preparing the film sample.
In some of the embodiments, the film sample is square, the side length of the square is not less than 100mm, and the distance between the end point of the cutting line and the edge of the film sample is 3 mm-7 mm.
In some embodiments, in step S2, T is more than or equal to 60 ℃ and less than or equal to 230 ℃, and T is more than or equal to 5min and less than or equal to 15 min.
In some of these embodiments, the step S3 includes the following steps:
s31, providing a pressing plate in a shape of a Chinese character 'hui', wherein an inner frame of the pressing plate is square, the side length of the inner frame of the pressing plate is smaller than that of the film sample, and the length of a diagonal line of the inner frame of the pressing plate is not smaller than that of the cutting line of the film sample;
s32, placing the film sample taken in the step S2 between the horizontal plane and the pressing plate, so that the edge of the film sample is pressed between the pressing plate and the horizontal plane, and the cutting line of the film sample is in the inner frame of the pressing plate;
and S33, measuring the vertical distance between the vertex of each top angle and the horizontal plane.
In some embodiments, in step S33, the vertical distance between the vertex of each vertex angle and the horizontal plane is measured using a portable combination ruler.
In some of these embodiments, the compression plate inner frame side length is 1% to 10% less than the film sample side length.
According to another aspect of the present invention, there is provided a thin film material thermal deformation testing apparatus, comprising:
the cutting die is provided with two mutually perpendicular cutting grooves in the edge, the cutting grooves penetrate through the cutting die, and the distances from the intersection point of the two cutting grooves to the end points of each cutting groove are equal; and
the pressure strip, the pressure strip is back the font, the inside casing of pressure strip is the square, cut the length in groove and do not exceed the length of pressure strip inside casing diagonal.
In some embodiments, the cutting die is square, the side length of the cutting die is 95 mm-105 mm, the thickness of the cutting die is 0.5 mm-10 mm, and the width of the cutting groove is 0.3 mm-0.8 mm.
In some embodiments, the side length of the inner frame of the pressing plate is smaller than that of the cutting die.
Compared with the prior art, the invention can quantitatively measure the deformation of the film material in the transverse direction and the longitudinal direction, thereby improving the film preparation process by utilizing the measured data; the test method is simple and has good repeatability.
Drawings
FIG. 1 is a schematic view of one embodiment of a cut film sample;
FIG. 2 is a schematic view of one embodiment of a cutting die;
FIG. 3 is a schematic view of one embodiment of a hold-down plate;
FIG. 4 is a schematic cross-sectional view of a film sample disposed between a compression plate and a horizontal plane, wherein the compression plate and film sample are not fully shown;
in the figure:
100. a film sample; 101. cutting a line; 110. a first apex angle; 120. a second apex angle; 130. a third apex angle; 140. a fourth apex angle;
200. cutting the die; 201. cutting the groove;
300. a compression plate;
400. a movable combined ruler;
600. a horizontal plane.
Detailed Description
The present invention is further described below with reference to specific embodiments, and it should be noted that, without conflict, any combination between the embodiments or technical features described below may form a new embodiment.
In the description of the present invention, it should be noted that, for the terms of orientation, such as "central", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., it indicates that the orientation and positional relationship shown in the drawings are based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, but does not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated without limiting the specific scope of protection of the present invention.
The invention provides a thermal deformation testing method of a thin film material, which comprises the following steps:
s1, providing a film to be cut, cutting the film within the edge of the film to be cut to form two cutting lines 101 perpendicular to each other, thereby obtaining a film sample 100, wherein the distance from the intersection point of the two cutting lines 101 to the end point of each cutting line 101 is equal, the middle part of the cut film sample 100 has four vertex angles, which are sequentially marked as a first vertex angle 110, a second vertex angle 120, a third vertex angle 130 and a fourth vertex angle 140, as shown in fig. 1;
s2, placing the film sample 100 into an oven, raising the temperature to T, taking out the film sample 100 after the placement time T, and tilting the vertex angle upwards when the film sample 100 is heated and shrunk in the oven;
s3, the film sample 100 taken out in step S2 is placed on a horizontal plane 600, the edge of the film sample 100 is attached to the horizontal plane 600, the vertical distance between the top of each vertex and the horizontal plane 600 is measured, and the thermal deformation amount of the film is represented by this distance.
The film to be cut can be square or in other shapes, and only the four end points of the two cutting lines 101 are required to be positioned at the four vertexes of a square, and the square is positioned in the edge of the film to be cut.
For example, in the length direction (i.e., the Machine Direction (MD)) and the width direction (i.e., the Transverse Direction (TD)) of the film, the thermal deformation amount of the film in the machine direction can be represented by the warp height of the vertex of two opposite vertex angles in the machine direction, and the thermal deformation amount of the film in the transverse direction can be represented by the warp height of the vertex of two opposite vertex angles in the transverse direction.
In some embodiments, to ensure that the cut is accurate and quick, step S1 includes the following steps:
s11, providing a film to be cut and a cutting die 200, as shown in fig. 2, two cutting grooves 201 perpendicular to each other are provided in the edge of the cutting die 200, the cutting grooves 201 penetrate the cutting die 200, and the distance from the intersection point of the two cutting grooves 201 to the end point of each cutting groove 201 is equal;
s12, placing the film to be cut between a plane and the cutting die 200 so that the two cutting grooves 201 are opposite to the area inside the edge of the film to be cut;
s13, inserting a cutting blade into the cutting groove 201, moving the cutting blade along the cutting groove 201, thereby forming two intersecting cutting lines 101 on the film to be cut, and making the cutting lines form an angle of 45 ° with the longitudinal or transverse direction of the film to be cut 101 to obtain the film sample 100.
The two cutting grooves 201 are opposite to the area inside the edge of the film to be cut, which means that when the film to be cut is aligned with the cutting die 200, the end of the cutting groove 201 does not exceed the edge of the film to be cut, and thus the edge of the film to be cut is not cut during cutting.
And making an included angle between the cutting line and 101 in the longitudinal direction or the transverse direction of the film to be cut be 45 degrees, namely making the directions corresponding to two groups of opposite vertex angles on the film sample respectively correspond to the longitudinal direction or the transverse direction of the film sample, and representing the thermal deformation of the film in the transverse direction and the longitudinal direction.
When the cutting die 200 provided by the invention is used for cutting a film to be cut, the blade can accurately cut along the diagonal line under the limit of the cutting groove 201, and the two cutting lines 101 formed after cutting meet the measurement requirement. It will be appreciated by those skilled in the art that cutting with a blade requires a forceful cut to penetrate the film to be cut.
Preferably, the width of the cutting groove 201 is slightly larger than the thickness of the blade, so that the blade can move smoothly along the cutting groove 201 and is not easy to shake left and right in the cutting groove 201.
In some embodiments, the film sample 100 is square with sides no less than 100mm, and the end point of the cut line 101 is a distance L from the edge of the film sample 1001Is 3mm to 7 mm.
In some embodiments, the cutting die 200 is square, the cutting template 200 is a steel plate, the side length of the cutting die 200 is 95mm to 105mm, and the thickness of the cutting die 200 is 0.5mm to 10mm, preferably 2.5mm to 10 mm; the width of the cutting groove 201 is 0.3 mm-0.8 mm, and the distance L between the end point of the cutting groove 201 and the edge of the cutting die 2002Is 3mm to 7 mm.
In some embodiments, in step S2, T is 60 ℃ or more and 230 ℃ or less, and T is 5min or more and 15min or less.
In some embodiments, in step S2, the oven is a forced convection oven.
In some embodiments, step S3 includes the steps of:
s31, providing a pressing plate 300 in a shape of a Chinese character 'hui', as shown in fig. 3, wherein the inner frame of the pressing plate 300 is square, the side length of the inner frame of the pressing plate 300 is less than the side length of the film sample 100, so that the pressing plate 300 can cover the edge of the film sample 100, the length of the diagonal line of the inner frame of the pressing plate 300 is not less than the length of the cutting line 101 of the film sample 100, so that the pressing plate 300 does not cover the two cutting lines 101 of the film sample 100 when covering the edge of the film sample 100;
s32, placing the film sample 100 taken out in the step S2 between the horizontal plane 600 and the pressing plate 300, such that the edge of the film sample 100 is pressed between the pressing plate 300 and the horizontal plane 600 and the cutting line 101 of the film sample 100 is located inside the inner frame of the pressing plate 300, as shown in fig. 4;
s33, measuring the vertical distance between the vertex of each vertex angle and the horizontal plane 600.
In some embodiments, in step S33, the vertical distance 600 between the vertex of each vertex angle and the horizontal plane is measured using the portable combination ruler 400, as shown in FIG. 4.
In some embodiments, the compression plate 300 has an inside frame side length that is 1% to 10% less than the side length of the film sample 100.
In some embodiments, the outer frame of the pressing plate 300 has a side length of 120mm to 150 mm.
The invention also provides a film thermal deformation testing device, which comprises a cutting die 200 and a pressing plate 300.
The cutting die 200 has two mutually perpendicular cutting grooves 201 in the edge, the cutting grooves 201 penetrate the cutting die 200, and the distance from the intersection point of the two cutting grooves 201 to the end point of each cutting groove 201 is equal. The pressing plate 300 is in a shape of a Chinese character 'hui', and the inner frame of the pressing plate 300 is square. The length of the cutting groove 201 does not exceed the length of the diagonal line of the inner frame of the compacting plate 300.
In some embodiments, the cutting die 200 is square, the material of the cutting die 200 is a steel plate, the side length of the cutting die 200 is 95mm to 105mm, the thickness of the cutting die 200 is 0.5mm to 10mm, preferably 2.5mm to 10mm, the width of the cutting groove 201 is 0.3mm to 0.8mm, and the distance L between the end point of the cutting groove 201 and the edge of the cutting die 200 is2Is 3mm to 7 mm.
In some embodiments, the outer frame of the pressing plate 300 has a side length of 120mm to 150 mm.
In some embodiments, the sides of the interior frame of the compacting plate 300 are less than the sides of the cutting die 200.
[ example 1 ]
(1) Cutting a PET film into square film samples 100 with the side length of 110 mm;
(2) placing the film sample 100 between a plane and a cutting die 200, ensuring the center of the film sample 100 to be aligned with the center of the cutting die 200 as much as possible, then inserting an art knife into a cutting groove 201, cutting the film sample 100 with force until the film sample 100 is divided into four triangular areas, and marking the triangular areas as a first area, a second area, a third area and a fourth area according to the clockwise direction, wherein the first area and the third area are along the longitudinal direction (MD) of the film, the second area and the fourth area are along the Transverse Direction (TD) of the film, and the edges of the cut film sample are smooth and have no burrs;
(3) the film sample 100 is placed in an oven at 100 ℃, the film sample 100 is taken out after 10min, the taken film sample 100 is placed on a horizontal plane, then the compression 300 is covered on the film sample 100, the edge of the film sample 100 is compressed, then the ruler end of the movable combined ruler 400 is vertically arranged on the horizontal plane, then the horizontal end of the movable combined ruler 400 is moved to the vertex angle of the first area, the tilting height of the vertex angle of the first area is recorded, similarly, the tilting height of the vertex angles of the second area, the third area and the fourth area is sequentially measured and recorded, and the measurement result is shown in table 1.
[ example 2 ]
The PET film in example 1 was replaced with a BOPET (biaxially oriented PET) film, and the other steps were the same as in example 1.
[ example 3 ]
The PET film in the example 1 is replaced by a PET-based metal composite film, and other steps are the same as the example 1
TABLE 1,
[ repeatability verification ]
The test was conducted 3 times again by referring to the method of example 1, and the measurement results were recorded as in table 2.
TABLE 2
The standard deviation in the MD direction was 0.06 and the standard deviation in the TD direction was 0.08, and it was found that the test of the present invention was good in reproducibility.
The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are within the protection scope of the present invention.
Claims (10)
1. A method for testing thermal deformation of a thin film material is characterized by comprising the following steps:
s1, providing a film to be cut, cutting the film to be cut within the edge of the film to be cut to form two cutting lines which are perpendicular to each other, and enabling the included angle between the cutting lines and the film to be cut to be 45 degrees in the longitudinal direction or the transverse direction, so as to obtain a film sample, wherein the distance from the intersection point of the two cutting lines to the end point of each cutting line is equal, and the middle part of the film sample after cutting has four top angles;
s2, placing the film sample into an oven, raising the temperature to T, and taking out the film sample after the film sample is placed for time T;
s3, placing the film sample taken out in the step S2 on a horizontal plane, attaching the edge of the film sample to the horizontal plane, and measuring the vertical distance between the vertex of each vertex angle and the horizontal plane.
2. A method for testing thermal deformation of a thin film material according to claim 1, wherein said step S1 includes the steps of:
s11, providing the film to be cut and a cutting die, wherein two mutually perpendicular cutting grooves are formed in the edge of the cutting die, the cutting grooves penetrate through the cutting die, and the distance from the intersection point of the two cutting grooves to the end point of each cutting groove is equal;
s12, placing the film to be cut between a plane and the cutting die so that the two cutting grooves are opposite to the area inside the edge of the film to be cut;
and S13, inserting a blade into the cutting groove, and moving the blade along the cutting groove, so as to form two cutting lines on the film to be cut, thereby preparing the film sample.
3. The method for testing thermal deformation of a thin film material according to claim 2, wherein the thin film sample is square, the side length thereof is not less than 100mm, and the distance between the end point of the cutting line and the edge of the thin film sample is 3mm to 7 mm.
4. The method for testing thermal deformation of a film material according to any one of claims 1 to 3, wherein in step S2, T is 60 ℃ to 230 ℃, and T is 5min to 15 min.
5. A method for testing thermal deformation of a thin film material according to any one of claims 1 to 3, wherein said step S3 comprises the steps of:
s31, providing a pressing plate in a shape of a Chinese character 'hui', wherein an inner frame of the pressing plate is square, the side length of the inner frame of the pressing plate is smaller than that of the film sample, and the length of a diagonal line of the inner frame of the pressing plate is not smaller than that of the cutting line of the film sample;
s32, placing the film sample taken in the step S2 between the horizontal plane and the pressing plate, so that the edge of the film sample is pressed between the pressing plate and the horizontal plane, and the cutting line of the film sample is in the inner frame of the pressing plate;
and S33, measuring the vertical distance between the vertex of each top angle and the horizontal plane.
6. A method for heat distortion testing of thin film materials as set forth in claim 5, wherein in step S33, the vertical distance between the apex of each of said apex angles and said horizontal plane is measured using a portable measuring ruler.
7. A method for hot deformation testing of thin film materials according to claim 5, wherein the inner frame side of the pressing plate is 1-10% smaller than the side of the thin film sample.
8. A film material thermal deformation testing apparatus based on the testing method of any one of claims 1 to 7, the testing apparatus being used for positioning the positions of two cutting lines on the film to be cut, characterized in that the testing apparatus comprises:
the cutting die is provided with two mutually perpendicular cutting grooves in the edge, the cutting grooves penetrate through the cutting die, and the distances from the intersection point of the two cutting grooves to the end points of each cutting groove are equal; and
the pressure strip, the pressure strip is back the font, the inside casing of pressure strip is the square, cut the length in groove and do not exceed the length of pressure strip inside casing diagonal.
9. A thin film material thermal deformation testing device as set forth in claim 8, wherein said cutting die is square with a side length of 95mm to 105mm, a thickness of 0.5mm to 10mm, and a width of 0.3mm to 0.8 mm.
10. A thin film material thermal deformation testing apparatus as set forth in claim 9, wherein the inner frame of the pressing plate has a side length smaller than that of the cutting die.
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