1、 1 Scope This standard specifies the cutting and perforating dimensions for 16-mm motion-picture film with two rows of 8-mm type R perforations and a perforation pitch of either 0.1500 in or 0.1497 in (3.810 mm or 3.802 mm). The width of the 8-mm strip after processing and slitting is also specified
2、 2 Dimensions 2.1 The dimensions shall be as given in figure 1 and table 1. 2.2 The dimensions pertain to a safety film as defined in SMPTE 223M. 2.3 Except for dimension A, the dimensions apply at the time of cutting and perforating for film adjusted to a temperature of 23C 1C (nominally converted
3、 to 72F 2F) and a relative humidity of 50% 2%. The manufacturer may indicate other nominal temperature and humidity conditions under which the dimensions apply. Dimension A applies immediately after slitting. NOTE The title of this standard was established by the application of a nomenclature system
4、 developed for all film dimension standards. Each title provides an indication of the film width, a code designation for the perforation shape (BH, KS, DH, or CS), or the number of rows of perforations (1R, 2R, etc.), depending upon which is the significant factor, or the perforation pitch without t
5、he decimal point. Figure 1 Single- and double-width film Page 1 of 2 pagesSMPTE 239-2004 Revision of SMPTE 239-1999 Copyright 2004 by THE SOCIETY OF MOTION PICTURE AND TELEVISION ENGINEERS 595 W. Hartsdale Ave., White Plains, NY 10607 (914) 761-1100 ApprovedNovember 8, 2004SMPTE STANDARD for Motion-
6、Picture Film (16-mm) Perforated 8-mm Type R, 2R SMPTE 239-2004 Page 2 of 2 pages Table 1 Specifications Dimensions Inches Millimeters A A B B C D E G L L M R Film width Film width after slitting Perforation pitch (long) Perforation pitch (short) Perforation width Perforation height Edge to perforati
7、on Perforation misalignment 100 consecutive perforation pitches 100 consecutive perforation pitches Lateral perforation displacement Radius of perforation fillet 0.628 0.001 0.314 0.002 0.1500 0.0005 0.1497 0.0005 0.0720 0.0004 0.0500 0.0004 0.0355 0.0020 0.001 max 15.000 0.015 14.970 0.015 0.485 0.
8、001 0.010 0.001 15.95 0.03 7.98 0.05 3.810 0.013 3.802 0.013 1.829 0.010 1.270 0.010 0.902 0.051 0.03 max 381.00 0.38 380.24 0.38 12.32 0.03 0.25 0.03 Annex A (informative) Additional data A.1 The user is reminded that, as a plastic, film can change dimensions temporarily due to moisture or temperat
9、ure, or permanently due to solvent loss or strain effect. A.2 The uniformity of pitch, hole size, and margin (dimensions B, C, D, and E) is an important variable affecting steadiness. Variations in these dimensions, from roll to roll, are of little significance compared to variations from one perfor
10、ation to the next within any small group of consecutive perforations. As an example, the uniformity of the margin is uniquely critical for optical printing. During the printing process, the placement of the image on the film is usually with respect to successive lateral pairs of perforations at one-
11、frame intervals. During subsequent projection, however, the portion of the image projected is usually located, not by these perforations, but by the edge of the film. The lateral steadiness of the projected image is, therefore, directly related to the frame-to-frame uniformity of the margin. A.3 For historical background on the development of this standard, refer to Miller, A. J. and Robertson, A. C. Motion-picture film Its size and dimensional characteristics. Journal of the SMPTE 74:3-11; January 1965. Annex B (informative) Bibliography SMPTE 223M-2001, Motion-Picture Film Safety Film
