Methods of stretching films and such films
A stretching film and biaxial stretching technology, applied in chemical instruments and methods, synthetic resin layered products, layered products, etc., can solve the problems of inflexibility of stretching ratio and high production cost
Inactive Publication Date: 2005-05-18
3M CO
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- Application Information
AI Technical Summary
Problems solved by technology
Simultaneous tenter-stretched films currently occupy a small portion of the film backing market because, while this method is capable of continuously stretching films in both machine and transverse directions, they have historically proven to be expensive and slow to No flexibility in stretch ratio
Method used
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Examples
Experimental program
Comparison scheme
Effect test
Embodiment C1
[0105] Example C1: MD Unbiased Stretch
[0106] Stretching was performed at an oven temperature of 160°C. Figure 6 A stretched plot illustrating the time-dependent components of the global MDR and TDR of Example C1 as a function of time is shown, Figure 7 A stretched graph is shown. The parameter values of the tensile diagram and the tensile uniformity and tensile test results are shown in Table 1. This is the case for MD unbiased stretching.
Embodiment C2
[0107] Example C2: Approximate Proportional Stretch
[0108] Stretching was performed at an oven temperature of 160°C. Figure 8 A stretched plot illustrating the time-dependent components of the global MDR and TDR of Example C2 as a function of time is shown, Figure 9 A stretched graph is shown.
Embodiment 3
[0109] Example 3: MD over-biased stretching
[0110] Stretching was performed at an oven temperature of 160°C. Figure 10 Tensile plots illustrating the full range MDR and TDR of Example 3 are shown.
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Abstract
The present invention relates to a method of biaxially stretching polymeric films to achieve final stretch parameters in first and second directions based on an overstretched stretch profile. The method comprises the steps of: a) imparting to the film a temperature sufficiently high to enable substantial biaxial stretching; b) biaxially tenterstretching the film to at least 1.2 of the final stretch parameter (14) in the first direction times the maximum value (48) of the stretch parameter in the first direction, wherein the final stretch parameter in the first direction is no greater than the final stretch parameter in the second direction; and c) after step b), retracting the film in the first direction to First direction final stretch parameter.
Description
technical background [0001] In general, the present invention relates to a method of biaxially stretching a film and a film thereof, and more specifically, the present invention relates to a method of stretching a film simultaneously in two directions and a film thereof. background of the invention [0002] Biaxially stretched films are known in the industry. Furthermore, several methods and apparatuses for biaxially stretching films in two directions simultaneously have also been described, see U.S. Pat. Tensile diagrams of the changes obtained using some of the methods and apparatus described above have been described. [0003] For example, US Patent No. 3,890,421 in its figure 1 Its content is illustrated in: Curve I represents normal sequential stretching, longitudinal stretching followed by transverse stretching; Curve II corresponds to reverse sequential stretching, transverse stretching followed by longitudinal stretching; diagonal curve II ( Originally, curve III)...
Claims
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IPC IPC(8): B29C55/16B32B27/08B29C55/12B29K23/00
CPCB29C55/16
Inventor 黄超平T·P·汉申A·P·弗格森W·W·梅里尔F·J·罗什卡J·N·杰克逊
Owner 3M CO