1、- - STD-SMPTE RP ILL-ENGL 1999 O 8357401i 0003603 449 SMPTE RECOMMENDED PRACTICE RP 111-1999 Revision of RP 11 1-1994 Dimensions for 70-, 65- and 35-mm Motion-Picture Film Splices 1 Scope 1.1 This practice specifies the significant dimen- sions of splices for 70- , 65, and 35-mm motion- picture film
2、 intended for projection and exhibition or for laboratory printing. 1.2 There are a number of methods for splicing triacetate or polyester motion-picture film that have found practical and commercial acceptance and that meet the operational requirements for the physical strength of the bond. This pr
3、actice is not intended to recom- mend one method over another, but rather to emphasize the requirements common to all splices. 2 Applications 2.1 Within the motion-picture technology, splices are employed in two different contexts with correspondingly different permissible toler- ances: 2.1.1 Projec
4、tion applications The film is usually a print and the primary objective is for the splice to be unobtrusive in the projected image and the reproduced sound. Film guiding and position- ing are usually achieved through the film seeking an equilibrium position within a system that introduces high toler
5、ance edge guiding for lateral positioning, and perforation reference against a loose-fitting tooth or claw for vertical positioning. The splice used in projec- tion applicaiions will have slightly broader dimen- sional tolerances than the splice used in laboratory applications. 1 Page 1 of 5 pages 2
6、.1.2 Laboratory applications The film may be negative or positive, camera original or intermediate, etc. The primary objective is for the splice to be unobtrusive in the end product achieved through contact or optical printing, special effects, etc. The dimensional tolerances on splices are more rea
7、dily controlled and the permissible tolerances are tighter than for the projection application in 2.1.1. 3 Dimensions 3.1 The dimensions shall be as given in the figures and tables and apply to processed films and leaders which contain nominal shrinkage up to 0.2%. 3.2 The film width at the splice s
8、hall not exceed 1.379 in (35.03 mm) for 35-mm films 2.561 in (65.05 mm) for 65-mm films 2.758 in (70.05 mm) for 70-mm films 3.3 The angle between the respective edges of the spliced films shall be 180“ f 3. Thus, the spliced film shall be aligned to the extent that when one portion of the film is pl
9、aced against a straightedge, the other portion will not deviate more than 0.004 in (0.10 mm) in 5 in (127 mm). 3.4 Dimensions of the butt splices shall conform to dimensions B, E, G, and H, as specified in the tables. 3.5 Butt splices shall be made centrally on the frameline. Copyright O 1999 by the
10、 SOCIETY OF MOTION PICTURE AND TELEVISION ENGINEERS 595 W. Hartsdale Ave., White Plains, NY 10607 Approved April 22, 1999 (914) 761-1100 STD-SMPTE RP III-ENGL mq m ,9357403 00031i04 385 m RP 111-1999 Figure 1 - Splices on 70-, 65- and 35-mm films Table 1 - Dimensions of cement overlap splices for 35
11、-mm motion-picture film I Laboratory Projection nonanamorphic prints Projection anamoprphic prints) 1 I Dim ens i on s in rnm in mm in mm 1 A* 0.049 nom 1.24 nom 0.073 nom 1.85 nom 0.048 nom 1.22 nom IB 0.560 10.002 14.22 f 0.05 0.561 10.002 14.25 I 0.05 0.561 I 0.002 14.25 10.05 1 C 0.268 10.002 6.
12、81 I0.05 0.278 10.004 7.06 IO.10 0.268 10.002 6.81 10.05 ID 0.341 + 0.002 8.66 10.05 0.356 I 0.004 9.04 IO.10 0.341 10.002 8.66 f 0.05 ) Notice that the splices on anamorphic films will fall within the projected area, and extra care must be *) To minimize projection of splices, the width of the labo
13、ratory splice should be no greater than 0.040 in taken in making a clean splice. (1.02 mm). Table 2 - Dimensions of cement overlap splices for 70- and 65-mm motion-picture films for laboratory and projection I Dimensions Inches Mi I i i mete rs A 0.067 ref 1.70 ref I B C D 0.561 10.002 14.25 I 0.05
14、0.275 I 0.002 6.98 10.05 0.353 f 0.002 8.97 I 0.05 Table 3 - Dimensions of weld overlap splices on 35-mm polyester motion-picture film KS perforation CS perforation Dimensions in mm in mm A 0.020 nom 0.51 nom 0.020 nom 0.51 nom B 0.561 I 0.002 14.25 I 0.05 0.561 10.002 14.25 10.05 C 0.252 I 0.002 6.
15、40 I 0.05 0.254 10.002 6.45 10.05 D 0.329 f 0.002 8.36 f 0.05 0.327 I 0.002 8.31 I 0.05 L Page 2 of 5 pages STD-SMPTE RP 112-ENGL 2777 II 8357401 0003605 211 = RP 111-1999 Figure 2 - Full projection cement splices on 35-mm projection prints Table 4 - Dimensions of full-perforation overlap splices on
16、 35-mm motion-picture projection prints Millimeters -4 Dimensions Inches A 0.156 nom 3.96 nom B 0.561 * 0.002 14.25 k 0.05 C 0.241 k 0.002 6.12 f 0.05 1 D 0.476 10.002 12.09 +_ 0.05 1 - 1 J t 1- I J E G I H Figure 3 - Dimensions for all film widths Table 5 - Dimensions for ali splices Laboratory Pro
17、jection I Dimensions E (see A.4) in rnm in 0.013 max 0.33 max 0.019 max G (see A.3) 0.002 max 0.05 max 0.002 max 0.05 max I I H (see A.2) 0.002 max 0.05 max 0.002 max 0.05 max i Page 3 of 5 pages STD.SMPTE RP 111-ENGL 1999 6357401 0003606 158 E RP 111-1999 3.6 The dimensions of the tape applied to s
18、ecure a butt splice shall not interfere with the film dimensions specified for the particular film type. 3.7 The tape shall be wide enough to cover at least half a frame on each side of the splice. 3.8 Tape splices shall be made with an optically clear, transparent tape resulting in a splice capable
19、 of withstanding tension at least 50% greater than projector gate tension for that film width. 3.9 The tape shall adhere uniformly to the film without corrugations or entrapped air bubbles. Annex A (informative) Additional data A.l Maintaining continuity of pitch across the splice requires that the
20、perforation interval within which the splice lies be equal to the perforation intervals in the unspliced portions. This may be difficult to measure, however, inasmuch as the act of forming the bond may slightly distort perforation walls in those perforations nearest the bond (because of solvent, the
21、rmal, or mechanical action) and, therefore, introduce uncertainty into the measurement. Consequently, it is not customary to measure the primary dimension, but to measure over two or more perforation intervals. A.2 The lateral alignment that is most significant for the projection and exhibition mode
22、 of film use is the avoidance of any large offset of the film edges before and after the splice, dimension H. Therefore, for projection applications, this is the most convenient control parameter. A.3 The lateral alignment that is most significant for the printing mode of film use is the maintenance
23、 of perforation alignment across the splice. Therefore, for laboratory appli- cations, the most convenient control parameter is dimension G. A.4 The splice joint for triacetate film may be made as an overlap splice using either film cement, thermal fusion, or transparent pressure-sensitive (adhesive
24、) tape applied to both sides. In some cases, the tape is applied for reinforce- ment during projection to either one or both sides of a cement splice. A butt splice may also be made using thermal fusion or tape. The splice joint for polyester films is usually made as an overlap splice that is physic
25、ally molecularly welded together by an ultrasonic splicer. Either an overlap splice or a butt splice may be made by applying transparent pressure-sensitive (adhesive) tape to both sides of the poly- ester film. There are several methods of forming the film overlap or joint for splices used by labora
26、tories and film exchanges. The most common methods are usually referred to as nega- tive splices, positive splices, full-hole positive splices, L 3.10 The width of the tape used shall encom- pass the full width of the film on one side, and exclude the perforation area and the area of the magnetic re
27、cords and balance stripes on the opposite side. Splices with tape on one side only are not functional in projection and wrapped around the film interfere with guiding and are unacceptable. - are unacceptable. Splices made with tape r 3.11 Butt splices shall be made so that the film ends are touching
28、 as closely as possible to prevent white light from showing through. and butt splices. In addition, transparent pressure-sensi- tive (adhesive) tape splices are currently employed on 35- mm films for theatrical projection applications utilizing automated equipment with large reels or horizontal plat
29、ters. Cinemascope splices can be made with an overlap of as little as 0.030 in (0.76 mm). If moisture is used to remove the emulsion on triacetate film, the film ends must be dry before applying cement and making the splice. A.5 Tape used to reinforce a cement splice on any film size should preferab
30、ly be placed on the base side, except that for the reinforcement of a cement splice on magnetic striped film, the tape should be applied in the emulsion side of the film to avoid masking the magnetic sound tracks. If a splice consists of tape material only, however, the tape should be applied to bot
31、h sides of the film to prevent collapse or hinging during projection, but must not cover magnetic stripes if present. For optimum results, the reinforcing material (splicing tape) should extend to both edges of the film to include the perforation area, except in the case of magnetic striped prints a
32、s noted above. Although tape width is not considered critical, it has been determined that tape 0.750 in (19.05 mm) wide, which includes two perforations on each side of the splice, may adequately reinforce splices. Consideration should be given to the sudden changes in apparent film stiffness at th
33、e edges of the splicing tape if tapes on the two sides of the film are exactly superimposed, and to the possible visibility of the tape edges if they appear in the projected image. When a butt splice is made with tape only, care should be taken to tightly butt the two pieces of film with minimal sep
34、aration with the tape placed on both sides of the film. The spliced film should flex evenly, with no tendency to collapse or hinge. Page 4 of 5 pages STD-SMPTE RP LLL-ENGL 1999 W 8357403 0003b07 094 IICI RP 111-1999 A.6 When overlap splices are made on film which will travel over magnetic heads, the
35、 splice should be made so that the trailing film drops onto the scanning head rather than bumps up onto it A.7 When tape splices are used, care should be taken to keep perforations clear of foreign matter This requires careful alignment of preperforated tape, or clean, precise perforating of the tap
36、e by the splicer A.8 Splices should be inspected frequently for defects including dirt, discoloration, edge lifting, etc With tape splices, it is important to inspect for stretching, hinging, oozing of adhesive, and width-wise expansion which can cause a hang-up in projection A.9 If the splice consi
37、sts of a tape material or if tape material IS used to reinforce cement splices, it is recommended that consideration be given to the trans- parency characteristics All air bubbles should be removed and the edges of the tape should make firm contact Currently available pre- or post-perforated transparent polyester tape with pressure-sensitive adhesive is recom- mended Page 5 of 5 pages
