MIL-DTL-22020E
3.4.2 Seam widths. Seam widths and tolerances shall be as specified in Table II, except that:
Seams fabricated by the dielectric, impulse, or ultra-sonic process shall have a minimum
1
/32 inch wide heat seal. Seams fabricated from unsupported plastic sheet such as
polyethylene or polyolefin shall meet the seam (seal) strength requirement specified in
3.7 with no minimum seal width required.
TABLE II. Dimensions and tolerances for seam widths.
Bag area
Seam width
Tolerance
(one side)
(inches)
(inches)
⅜
-1/16, +1/8
25 sq. in. or less
-1/16, +¼
26 thru 200 sq. in.
½
-1/16, +⅜
5
201 thru 500 sq. in.
/8
-1/16, +⅜
5
501 sq. in. or over
/8
3.5 Identification. Each bag shall be marked or printed in capital letters, using 10-point
type, with the following information: This specification number and revision letter; type
designation; bag manufacturer's name and bag designation; month and year of bag fabrication.
Each bag shall contain this printing on at least one surface with the color and position of the
printing being optional. When the marking is interrupted or incomplete due to the size of the
bags, the individual bag need not be marked as specified, but shall be accompanied within the
shipping container by an identification sheet marked or printed with the same information. When
specified (see 6.2), a pressure sensitive label shall be applied to the outer surface of each bag in
lieu of marking the bag.
3.6 Sealing recommendations.
3.6.1 Heat sealing (Type I only). Each unit package of bags shall include a sheet legibly
marked with the following heat-sealing information.
a. Jaw type sealer (temperature, pressure, and dwell time).
b. Band type sealer (temperature, pressure, and dwell time).
c. Rotary type sealer (preheat, pressure, and speed).
3.6.2 Cold sealing ( Type II only). Each unit package of bags shall include a sheet
describing the speed of the rollers and the pressure (psi) used in making the seals.
3.7 Seam (seal) strength. Seals shall exhibit no separation for the duration of the 5 minute
test when tested as specified in 4.4.
4
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