TWI696831B - Cold shrinkable film tensile shrinkage performance testing method - Google Patents

Abstract

A method for testing the shrinkage performance of cold shrinkable film. It is a cold shrinkable film to be tested. First, two or more test samples with the same length and width dimensions are cut out with a standard cut size. The two or more test samples are grouped. And perform a segmented stretch test and a segmented shrinkage test on a stretch and shrinkage detector with a tensile displacement detector and a tension value detector respectively; a contraction test that passes the segmented shrinkage test The data and the stretch detection data of the segmented stretch detection are compared with each other. It is only necessary to determine whether the cold shrinkage is based on whether the shrinkage force value data of the shrinkage ratio data is the same or greater than the stretch value data of the stretch ratio data The film's tensile shrinkage performance and/or quality.

Description

Cold shrinkable film tensile shrinkage performance testing method

The invention relates to a cold shrinkable film tensile shrinkage performance detection method capable of easily determining the cold shrinkable film tensile shrinkage performance and quality.

Press, the goods or goods are packed on the pallet, the traditional stretch film is time-consuming and labor-intensive, and the packaging is completed in five to ten minutes, such as the use of cold shrink film packaging takes only one to two minutes to achieve Fully covered moisture-proof compact packaging effect. Heat-shrinkable film packaging consumes a large amount of heat energy, has a lot of consumable waste, and is easy to stick to the outside of the product. It takes five to ten minutes. If you use cold shrink packaging, you can avoid heat energy consumption, reduce electricity costs, and increase packaging speed. Cold shrink film means that the PE film bag can be stretched from the top to the bottom of the product by the cold shrink film machine without heating, using the high resilience of the film and the high clamping force to tightly wrap the entire product To form transparent packaging.

Although the cold shrink film has the above advantages compared to the stretch film or the heat shrink film, however, the cold shrink film produced by various manufacturers on the market has differences in cold shrink performance or quality due to different materials, manufacturing technology or equipment, which is only practical The cold shrink film machine is used to apply the cold shrink film samples to the wrapping packaging of goods or goods on the pallet, and the cold shrink performance of the cold shrink film or Whether the quality meets the requirements, only these project experiments are very labor-intensive and material-intensive quality inspection work, and the performance adjustment during the production of cold shrink film. These large-scale experimental work are lack of timeliness to adjust the data source, and even the experimental method There are uncertainties of human factors, it is difficult to get the quality of the standard recognition in the cold shrink film market.

The main purpose of the present invention is to provide a method for testing the shrinkage performance of a cold-shrinkable film. It is a cold-shrinkable film to be inspected. It first cuts out two or more test samples with the same length and width dimensions according to a cutting size standard. Group the two or more inspection samples, and perform a segmented tensile test and a segmented contraction test on a tensile contraction detector with a tensile displacement detector and a tension value detector, respectively; Sectional stretch detection is to use the sectioned stretch of the original length of the test sample in the form of increments of the stretch magnification for each step, and to detect the stretch produced when the test sample is subjected to different stretch magnification data. Tension value data; the segmented shrinkage test is to stretch the original length of the test sample to a verification magnification length at a time, and obtain a verification length tensile value data, then, the segmental release tension and tensile recovery length, and In the form of increasing shrinkage ratio (that is, decreasing stretch length) once for each period, the data of the contraction tension value reflected when different shrinkage ratio data is detected segment by segment; the contraction detection data and the segment tension that are detected by the segmental contraction detection The tensile test data of the tensile test are compared with each other. It is only necessary to determine the tensile shrinkage performance of the cold-shrinkable film based on whether the shrinkage data of the shrinkage ratio data is the same or greater than the tensile data of the data And or the pros and cons of quality.

The second object of the present invention is to provide a method for testing the shrinkage performance of a cold-shrinkable film, wherein the cold-shrinkable film to be inspected is cut out of the two or more test samples, and the thickness of the film body of the cold-shrinkable film is combined. Listed are the dimensional conditions of the test sample when performing the segmented stretch test and the segmented shrinkage test, then the tensile test data and the contraction test data content obtained by the segmented stretch test and the segmented shrinkage test Taking into account the conditions of the thickness of the film body, in order to determine the tensile shrinkage performance of the cold-shrinkable film, the thickness of the film body can be adjusted when other cold-shrinkable film new products are produced, and the change of the tensile shrinkage performance or quality can be easily achieved or improve.

Still another object of the present invention is to provide a method for testing the shrinkage performance of a cold shrinkable film, wherein the cold shrinkable film to be inspected is longitudinally and horizontally according to the direction when the film body is co-extruded. /Horizontal cutting, distinguish between two or more longitudinal inspection samples and two or more horizontal inspection samples, and group them on the stretch-shrinkage tester to perform longitudinal section stretch detection one by one, longitudinal section shrink detection, Lateral segmental stretch detection and transverse contraction detection; so that the results of the longitudinal contraction detection data can be compared with the longitudinal contraction detection data, and the transverse contraction detection data can be compared with the lateral direction contraction detection data As a result of this, the longitudinal stretch shrinkage performance and transverse stretch shrinkage performance of the cold-shrinkable film were determined.

Another object of the present invention is to provide a method for testing the shrinkage performance of a cold-shrinkable film, wherein the segmented tensile test is to segment two or more of the test samples one by one on the tensile-shrinkage tester Stretching to obtain more than two stretch detection data; the segmented shrinkage test is to stretch two or more of the test samples one by one on the stretch shrinkage detector to reach the verification magnification length, and then release through the segmentation Sectional shrinkage during tension and stretch recovery length to obtain more than two pieces of shrinkage detection data; by averaging the comparison data of the two or more pieces of stretch detection data content and the comparison of the two or more pieces of shrinkage detection data content The data is averaged for comparison, so that the data of the tensile shrinkage of the cold-shrinkable film can be more objective and accurate.

Another object of the present invention is to provide a method for testing the shrinkage performance of a cold-shrinkable film, wherein the segmented shrinkage test is the original length of the test sample by the stretch-shrinkage tester to reach the verification magnification in one stretch The stretching action is stopped during the length, and the tension and recovery length are released in sections after a period of stretching stop time, and the shrinkage force value data corresponding to the incremental shrinkage ratio data is detected step by step. It can simulate the actual use of the cold shrink film, which requires stretching and holding for a period of bagging, so that the number of shrinkage detections measured by the segmented shrinkage detection According to the data, the tensile shrinkage performance of the cold-shrinkable film can be more realistically presented; and the above-mentioned stretching stop time is preset to 30 seconds, and the stretching can be increased or decreased according to the thickness or difference of the film body of the test sample Number of seconds to park.

A further object of the present invention is to provide a method for detecting stretch shrinkage performance of a cold shrinkable film, wherein the shrinkage detection data of the segmented shrinkage detection is greater than the stretch detection data of the segmented stretch detection in terms of shrinkage recovery length In the case where the stretched length is equal, when the shrinkage value data of the shrinkage ratio data is less than the stretched value data of the stretch ratio data, it can be determined that the stretch rate of the cold shrinkable film does not reach the verification standard, otherwise, When the shrinkage tensile force value data is equal to or greater than the tensile tension value data, it can be determined that the stretch rate of the cold shrinkable film reaches the verification standard; The test samples are subjected to segmental shrinkage detection with different verification magnification lengths, that is, the actual stretch rate or the maximum stretch rate of the cold-shrinkable film can be detected.

Another object of the present invention is to provide a method for testing the shrinkage performance of a cold shrinkable film, wherein the cold shrinkable film to be inspected is actually used for cold shrinkage packaging of goods or goods, and has been tested to meet the For the cold shrinkable film required by the stretch rate and clamping force, the tensile test data and the shrinkage test data content obtained by the segmented stretch test and the segmented shrinkage test are used to establish the data as the cold shrink film stretch and shrink performance The verification standard can be used for the quality inspection of other cold-shrinkable films, which can quickly determine whether the tensile shrinkage performance of the other cold-shrinkable films meets the standards or requirements; The tensile test data and contraction test data content obtained by the segment shrinkage test is to establish a graph of the cold shrinkable film's tensile shrinkage performance verification graph, which can be conveniently used in the production of cold shrinkable film as the basis for quality management.

10: cold shrink film

10A, 10B: inspection samples

10PA: longitudinal inspection sample

10PB: horizontal inspection sample

20: stretch shrinkage detector

21: Tension displacement detector

22: Rally value detector

23A, 23B: fixture

J ₁ : crop

J ₂ : vertical/horizontal cropping

T ₁ : Cutting size standard

T ₂ : film thickness

T ₃ : Stretching time

SDD: Segmented stretch detection

PSDD: longitudinal segmental stretch detection

LSDD: horizontal segmented stretch detection

SSD: Segment shrinkage detection

PSSD: longitudinal segmental shrinkage detection

LSSD: horizontal segmental shrinkage detection

S ₁ ~S _N : Stretch ratio data

P ₁ ~P _N : Tensile value data

S _X : verification magnification length

P _X : verify the data of length and tension

SM ₁ ~SM _N : shrinkage ratio data

PX ₁ ~PX _N : shrinkage tension value data

SD: shrinkage detection data

DD: tensile inspection data

FIG. 1 is a schematic flowchart of the detection method of the present invention

FIG. 2 is a schematic diagram of the structure of the stretching and shrinking detector of the detection method of the present invention

FIG. 3 is a schematic diagram of another embodiment of cutting samples for inspection by the detection method of the present invention

Fig. 4 is a schematic diagram of the process of judging the longitudinal performance of the cold shrinkable film of the detection method of the present invention

FIG. 5 is a schematic diagram of the process of determining the lateral performance of the cold shrinkable film of the detection method of the present invention

6 is a graph showing the verification of tensile shrinkage performance obtained by the detection method of the present invention

In order to achieve the above-mentioned object, the present invention cites preferred embodiments, and in conjunction with the attached drawings, detailed descriptions are as follows:

A test method for tensile shrinkage of cold-shrinkable film, as shown in Figure 1, is a cold-shrinkable film 10 to be inspected. Firstly, a cutting size standard T ₁ cuts J _{1 to} produce more than two test samples with the same length and width dimensions. 10A, 10B, as shown in FIGS. 1, 2, the two or more test samples 10A, 10B are grouped, and performed on a tensile shrinkage detector 20 having a tensile displacement detector 21 and a tensile value detector 22, respectively One segmented stretch test SDD and one segmented shrink test SSD; the segmented stretch test SDD, as shown in Figure 1 and Table 1, is the segmented stretch of the original length of the test sample 10A, with the stretch ratio The increment is in the form of a step by step, and the tensile tensile force data P ₁ ~P _N generated when the test sample is subjected to different tensile magnification data S ₁ ~S _{N are} detected step by step; as shown in Figure 1 and Table 2, the points The segment shrinkage detection SSD is to stretch the original length of the test sample 10B to a verification magnification length S _X at a time, and obtain a verification length tensile value data P _X , then, the segment releases the tensile force and the tensile recovery length, and In the form of increasing shrinkage ratio (that is, decreasing stretching length) once for each stage, the shrinkage force value data PX ₁ ~PX _N reflected when different shrinkage ratio data SM ₁ ~SM _{N are} detected stage by stage; as shown in Figure 1, through The shrinkage detection data SD of the segmented shrinkage detection SSD (as shown in Table 2) and the stretch detection data DD of the sectioned stretch detection SDD (as shown in Table 1) are compared with each other (as shown in Table 3), as shown in Figure 1 and Table 3 , It is only necessary to determine whether the shrinkage data PX ₁ ~PX _{N of} the shrinkage ratio data SM ₁ ~SM _N are the same or larger than the stretch data data P _N-1 ~ of the stretch ratio data S _N-1 ~S _NN P _{NN is a} simple judgment of whether the cold-shrinkable film 10 has good or bad tensile and shrinkage properties.

According to the above detection method, taking the cold shrink film used in the market as an example, as shown in Figures 1 and 2, the cold shrink film 10 to be inspected is first cut with the cutting size standard T ₁ to cut two sheets of length 100mm and width 50mm Test samples 10A, 10B; group the test samples 10A, 10B, respectively clamped on both ends of the clamps 23A, 23B on the stretch shrinkage detector 20, to perform the segmented stretch detection SDD and the segmented shrinkage detection SSD ; Among them, as shown in Figure 1 and Table 4, the incremental stretch magnification value of the segmented stretch detection SDD is 10%, that is, the method of incrementing the original length of the test sample 10A by 10% in each segment is adopted from segment to segment. Stretching 10% to 150% to detect the tensile strength value; where, as shown in Figure 1 and Table 5, the segmented shrinkage detection SSD, the length of the test sample 10B is stretched 100% at a time as the verification magnification length (100mm ), and measured the verification length tensile value (5.21kgf), followed by, adopting four steps of increasing shrinkage ratio (10%~40%), that is, from the verification ratio length of 100mm, stepwise reduction of the stretch length of 10mm, four The shrinkage tensile force values are measured separately in sections; by comparing the data in Table 4 and Table 5, such as Table 6, it can be easily detected that the stretch rate of the shrink film 10 meets the requirement of 100% (and may be greater than 100%), in addition It can also be known from Table 4 that the stretching force of the cold-shrinkable film 10 ranges from 0 to 100%, and the clamping force generated per 50 cm square unit area; Extension and contraction performance and quality.

According to the above embodiment, wherein, as shown in FIG. 1, the cold shrinkable film 10 to be inspected is cut out of the two or more inspection samples 10A, 10B, and the thickness T ₂ of the film body of the cold shrinkable film 10 is listed as the inspection Samples 10A and 10B are subject to the dimensional conditions of the segmented stretch detection SDD and the segmented shrinkage detection SSD. If they are combined with Tables 1 and 2, the segmented stretch detection SDD and the segmental shrinkage detection SSD The content of the tensile test data DD and the shrinkage test data SD take into consideration the condition of the film body thickness T ₂ in order to determine the tensile shrinkage performance of the cold-shrinkable film 10 and adjust the film when new cold-shrinkable film is produced The thickness of the body simply changes or improves the tensile shrinkage performance or quality.

According to the above embodiment, wherein, as shown in FIG. 3, the cold shrinkable film 10 to be inspected is longitudinally/horizontally/horizontally J ₂ according to the direction when the film body is co-extruded to distinguish between two More than one longitudinal inspection sample 10PA and more than two horizontal inspection samples 10PB, as shown in Figures 4 and 5, and each group is grouped on the stretch shrinkage detector 20 to perform longitudinal segmental stretch detection PSDD one by one, longitudinal segmental contraction PSSD detection, horizontal segmental stretch detection LSDD, and lateral shrinkage detection LSSD; so that the results of the longitudinal stretch detection data SD can be compared with the longitudinal stretch detection data DD, and the transverse shrinkage detection data DD can be compared Based on the results of the tensile test data SD in the transverse direction (equivalent to Table 3), the longitudinal stretch shrinkage performance and the transverse stretch shrinkage performance of the cold-shrinkable film 10 were determined.

According to the above embodiment, wherein, as shown in FIG. 1, the segmented stretch detection SDD is to stretch two or more test samples 10A one by one on the stretch shrinkage detector 20 to obtain two or more stretches Extensive testing data DD; the segmented shrinkage detection SSD, which is to stretch two or more of the test samples 10B one by one on the stretching and shrinking detector 20 to reach the verification magnification Sx length, and then release the tension and tension by segment The segmented contraction when stretched back to length, to obtain more than two parts of the shrinkage detection data SD; by comparing the average of the two or more parts of the DD content of the stretch detection data and the comparison of the SD content of the two or more parts of the contraction detection data The data is averaged for comparison, so that the tensile shrinkage performance judgment data of the cold shrinkable film 10 can be more objective and accurate.

According to the above embodiment, wherein, as shown in FIG. 1, the segmented shrinkage detection SSD is the original length of the test sample 10B by the stretch shrinkage detector 20, and the stretching is stopped when the stretch reaches the verification magnification length S _X Action, and release tension and stretch recovery length in sections after a period of stretch stop time T ₃ , and detect the shrinkage tension value data PX ₁ ~PX _N corresponding to the incremental shrinkage ratio data SM ₁ ~SM _{N step} by step. The stretching stop time T ₃ can simulate that the cold shrinkable film 10 actually needs to be stretched and maintained for a period of bagging operation, so that the shrinkage detection data SD measured by the segmented shrinkage detection SSD can be more The tensile shrinkage performance of the cold-shrinkable film 10 is truly represented; and the above-mentioned tensile stop time T _{3 is} preset to 30 seconds, and the tensile stop can be increased or decreased according to the thickness or difference of the film body of the test sample 10B Set time T ₃ seconds.

According to the above embodiment, wherein, as shown in FIG. 1, the contraction detection data SD of the segmented contraction detection SSD is compared with the tensile test data DD of the segmented contraction detection SDD, as shown in Table 3, the contraction recovery length and the contraction length In the case of equality, when the shrinkage ratio data SM ₁ ~SM _N shrinkage value data PX ₁ ~PX _{N is} less than the stretch ratio data S ₁ ~S _N , the tensile strength value P ₁ ~P _N (eg less than 1000 (3/3) data, it can be judged that the stretch rate of the cold-shrinkable film 10 (because part of the molecular segment of the film body) does not reach the verification standard, otherwise, the shrinkage tensile force data PX ₁ ~PX _N is equal to or greater than the tensile When the tensile force data P ₁ ~P _N , it can be determined that the stretch rate of the cold shrinkable film 10 reaches the verification standard; as shown in FIG. 1, and the above stretch rate verification standard of the cold shrinkable film 10 is determined, another piece can be selected The above test samples 10A and 10B are respectively subjected to segmental shrinkage detection SSD with different verification magnification lengths S _X , which can detect the actual stretch rate or maximum stretch rate of the cold shrinkable film 10; for example, it can be increased when it meets the standard Verify the length of the magnification and detect the maximum stretch rate of the cold-shrinkable film; conversely, if it is not up to standard, the verification magnification length can be shortened to detect the sub-standard rate of the cold-shrinkable film.

According to the above embodiment, wherein, as shown in FIG. 1, the cold shrinkable film 10 to be inspected is a cold shrinkage which is actually used for cold shrink packaging of goods or goods, and has been tested to meet the requirements of elongation and clamping force Film, the content of the tensile test data DD and the shrinkage test data SD obtained by the segmented tensile test SDD and the segmented contraction test SSD is the establishment of data as a verification standard for the cold shrinkable film tensile shrinkage performance, as shown in Table 4 5, 5 and 6. This verification standard can be used for the quality inspection of other cold-shrinkable films, which can quickly determine whether the tensile shrinkage performance of the other cold-shrinkable films meets the standards or requirements; Extension detection SDD and the segmental contraction detection SS The tensile test data DD and shrinkage test data SD content obtained by D, such as the test data content of Tables 4, 5, and 6, as shown in Figure 6, is a graph to establish a tensile shrinkage performance verification curve of the cold shrink film, which can be easily applied to cold As a basis for quality management during shrink film production.

The above description is only illustrative rather than restrictive for the present invention. Those of ordinary skill in the art understand that many modifications, changes, or equivalents can be made without departing from the spirit and scope defined by the accompanying description , But all will fall within the protection scope of the present invention.

10: cold shrink film

10A, 10B: inspection samples

20: stretch shrinkage detector

J ₁ : crop

T ₁ : Cutting size standard

T ₂ : film thickness

T ₃ : Stretching time

SDD: Segmented stretch detection

SSD: Segment shrinkage detection

S ₁ ~S _N : Stretch ratio data

P ₁ ~P _N : Tensile value data

S _X : verification magnification length

P _X : verify the data of length and tension

SM ₁ ~SM _N : shrinkage ratio data

PX ₁ ~PX _N : shrinkage tension value data

SD: shrinkage detection data

DD: tensile inspection data

Claims (9)

A method for testing the shrinkage performance of cold shrinkable film. It is a cold shrinkable film to be tested. First, two or more test samples with the same length and width dimensions are cut out with a standard cut size. The two or more test samples are grouped. , And perform a segmented tensile test and a segmented contraction test on a tensile contraction detector with a tensile displacement detector and a tension value detector respectively; the segmented tensile test is adopted The segmented stretching of the original length of the test sample is in the form of increments of the stretch magnification, and the tensile tensile force data generated when the test sample is subjected to data of different stretch magnifications are inspected segment by segment; the segment contraction The test is to stretch the original length of the test sample to a verification magnification length at a time, and obtain a verification length tensile value data. Then, the tensile force and the tensile recovery length are released in sections, and the contraction magnification is increased (that is, the tensile (Length decreasing) once in the form of one step, the data of the contraction tension value reflected when the data of different shrinkage magnifications are detected step by step; the contraction detection data by the segmented contraction detection and the segmentation stretch detection of the tensile test data are mutually For comparison, it is only necessary to simply determine whether the tensile shrinkage performance and quality of the cold shrinkable film are based on whether the shrinkage tensile force data of the shrinkage magnification data is the same or greater than the tensile strength data of the stretch magnification data. According to the test method for tensile shrinkage performance of the cold shrinkable film according to item 1 of the patent application scope, wherein the cold shrinkable film to be inspected is cut out of the two or more test samples, and the thickness of the film body of the cold shrinkable film is combined Listed are the dimensional conditions of the test sample when performing the segmented stretch test and the segmented shrinkage test, then the tensile test data and the contraction test data content obtained by the segmented stretch test and the segmented shrinkage test Taking into account the conditions of the thickness of the film body, in order to determine the tensile shrinkage performance of the cold-shrinkable film, the thickness of the film body can be adjusted when other cold-shrinkable film new products are produced, and the change of the tensile shrinkage performance or quality can be easily achieved or improve. According to the test method for tensile shrinkage performance of cold shrinkable film as described in item 1 of the patent application scope, the cold shrinkable film to be inspected is longitudinally and horizontally according to the direction when the film body is co-extruded /Horizontal cutting, distinguish between two or more longitudinal inspection samples and two or more horizontal inspection samples, and group them on the stretch-shrinkage tester to perform longitudinal section stretch detection one by one, longitudinal section shrink detection, Lateral segmental stretch detection and transverse contraction detection; so that the results of the longitudinal contraction detection data can be compared with the longitudinal contraction detection data, and the transverse contraction detection data can be compared with the lateral direction contraction detection data As a result of this, the longitudinal stretch shrinkage performance and transverse stretch shrinkage performance of the cold-shrinkable film were determined. According to the test method for stretch shrinkage of cold-shrinkable film described in item 1 of the patent application scope, wherein the segmented stretch test is to segment two or more of the test samples on the stretch-shrink tester one by one Stretching to obtain more than two stretch detection data; the segmented shrinkage test is to stretch two or more of the test samples one by one on the stretch shrinkage detector to reach the verification magnification length, and then release through the segmentation Sectional shrinkage during tension and stretch recovery length to obtain more than two pieces of shrinkage detection data; by averaging the comparison data of the two or more pieces of stretch detection data content and the comparison of the two or more pieces of shrinkage detection data content The data is averaged for comparison, so that the data of the tensile shrinkage of the cold-shrinkable film can be more objective and accurate. According to the test method for stretch shrinkage performance of cold shrinkable film according to item 1 of the patent application scope, the segmented shrinkage test is the original length of the test sample by the stretch shrinkage tester in one stretch to reach the verification magnification The stretching action is stopped during the length, and the tension and recovery length are released in sections after a period of stretching stop time, and the shrinkage force value data corresponding to the incremental shrinkage ratio data is detected step by step. It can simulate the actual use of the cold-shrinkable film, which requires stretching and holding for a period of bagging, so that the shrinkage detection data measured by the segmented shrinkage detection can be It is more realistic to show the tensile shrinkage performance of the cold shrinkable film; and the above-mentioned stretching stop time is preset to 30 seconds, and the stretching stop can be increased or decreased according to the thickness or difference of the film body of the test sample Time in seconds. According to the cold shrinkable film tensile shrinkage performance detection method described in item 1 of the patent application scope, wherein the shrinkage detection data of the segmented shrinkage detection is compared with the tensile detection data of the segmented stretch detection, in the shrinkage recovery length and In the case where the stretching lengths are equal, when the shrinkage force value data of the shrinkage ratio data is less than the stretching force value data of the stretching ratio data, it can be determined that the stretch rate of the cold shrinkable film does not reach the verification standard, otherwise, the When the shrinkage tensile force value data is equal to or greater than the tensile tension value data, it can be determined that the stretch rate of the cold shrinkable film reaches the verification standard. According to the test method for tensile shrinkage performance of cold shrinkable film described in item 6 of the patent application range, where the cold shrinkable film stretch rate verification standard is judged, more than one other test sample can be selected, with different verification magnifications The length of the shrinkage is detected in sections, that is, the actual stretch rate or the maximum stretch rate of the cold shrink film can be detected. According to the test method for tensile shrinkage performance of cold shrinkable film described in item 1 of the patent application scope, the cold shrinkable film to be inspected is actually used for cold shrinkage packaging of goods or goods, and has been tested in accordance with For the cold shrinkable film required by elongation and clamping force, the tensile test data and shrinkage test data content obtained by the segmented stretch test and the segmented shrinkage test establish the data as the cold shrinkable film's tensile shrinkage performance Verification standard, so that the verification standard can be used for the quality inspection of other cold shrinkable films, and it can quickly determine whether the tensile shrinkage performance of the other cold shrinkable films meets the standards or requirements. The cold shrinkable film tensile shrinkage performance testing method described in item 8 of the patent scope, wherein the content of the tensile test data and shrinkage test data obtained by the segmented stretch test and the segmented shrinkage test are graphical Establishing a verification curve of tensile shrinkage performance of cold shrinkable film, which can be easily applied to cold As a basis for quality management during shrink film production.

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