1、 MIL-DTL-32235/1A 15 September 2010 SUPERSEDING MIL-DTL-32235/1 12 February 2007 INCH-POUND DETAIL SPECIFICATION SHEET HEATER MODULE, TYPE I: HEATER, ASSEMBLY REQUIRED This specification is approved for use by all Departments and Agencies of the Department of Defense. The requirements for acquiring
2、the product described herein shall consist of this specification sheet and MIL-DTL-32235. CLASSIFICATION Heater modules are of the following styles: Style A - Three sub-units plus Boil-In-Bag (BIB) module Style B - Four sub-units REQUIREMENTS I. Heater module. The Type I heater module shall consist
3、of a heater module box containing three or four heating trays, activation fluid units, heaters, polymeric food trays or Institutional Size Pouches (ISP) and the activation mechanism/pull tab. Sub-assemblies are allowed. When applicable, there shall also be a Boil-In-Bag (BIB) module. The components
4、and sub-units, except the heaters, and the BIB module (when applicable) shall be assembled and placed in the heater module box and the activation mechanism/pull tab shall be connected to the three or four activation fluid units. A barrier pouch containing the heaters shall be placed on top of the ot
5、her components in the heater module box. AMSC N/A FSC 8970 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-32235/1A 2A. Heater. The heater shall be constructed of materials that, when activated by a fluid, shall initiate and propagate an exot
6、hermic reaction suitable for use with food. This reaction shall generate adequate heat to heat the food to a safe food serving temperature. No toxic gas, liquid or solid by-products are desirable. If toxic by-products are produced, they shall be of the least severity and smallest amount possible whi
7、le allowing for adequate heating and ensuring operator and consumer safety. The heater material shall be evenly distributed and completely sealed within the scrim matrix of the heater to minimize the release of materials, and facilitate direct in-place activation of the heater materials. The heating
8、 rate shall be optimized to minimize the time required to heat the food, yet not cause excessive foaming or uncontrolled release of reaction by-products. The heater and barrier material shall not melt, deform or degrade during heating. The heater is activated by the addition of a fluid that shall fu
9、lly activate the heater material. The non-woven porous polymeric scrim shall be sealed and sized to accommodate proper fit and function of the heater module. Each heater (heater elements in a matrix) shall be correctly and legibly labeled in accordance with MIL-DTL-32235. Three or four heaters shall
10、 be packaged in a barrier pouch constructed from laminated material, with one lamina a minimum of 0.00035 inch thick aluminum foil. The pouch shall be heat sealed on all four edges. A tear nick, notch or serrations shall be provided to facilitate opening of the filled and sealed pouch. The barrier p
11、ouch shall have maximum outer dimensions of 11 by 15 inches. Each pouch with heaters shall be correctly and legibly labeled in accordance with MIL-DTL-32235. B. Activation fluid unit. The unit consisting of the pouch containing the activation fluid shall be made of material equivalent to Class 1 of
12、MIL-PRF-131. Alternate activation fluid pouch materials and design shall be permitted with approval from Natick Soldier Research, Development and Engineering Center. The pouch shall be manufactured in accordance with the dimensions and design shown in Figure 1. Tolerances for the pouch dimensions sh
13、all be + 1/8 inches. Sufficient length for the center strip and careful assembly is critical to ensuring that the pouch is not inadvertently torn open during assembly and subsequent transport and storage. The solid lines shown at 1 inch off center at the base of the strip are cut lines. The 1 inch c
14、enter strip section of the pouch shall be constructed with additional material for reinforcement. The center section of the pouch shall be scored (laser or mechanical) to provide easy tear properties without degrading the strength and barrier properties of the pouch. The pouch shall be filled with 1
15、.5 percent saline (water and sodium chloride) solution, or as specified by the heater manufacturer with approval from Natick Soldier Research, Development and Engineering Center. The volume of fluid in the pouch, when combined with the heater, shall be adequate to initiate and propagate the exotherm
16、ic reaction. Each activation fluid unit shall be correctly and legibly labeled in accordance with MIL-DTL-32235. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-32235/1A 3FIGURE 1. Activation fluid unit C. Heating tray. The heating tray shall
17、 be molded from 0.090 inch high density polyethylene. Injection molded and thermoformed designs have performed adequately; other acceptable processes and materials are allowed. The heating tray shall consist of two compartments. The smaller compartment serves as a retaining reservoir for the activat
18、or fluid unit and includes two buttons to which the two short tabs of the activation fluid unit pouch are secured. A fold-over flap shall be included on the heating tray to retain and protect the activation fluid unit. A slot shall be cut into the cover to allow the center strip of the activation fl
19、uid unit pouch to slide through, which later is attached to an activation mechanism/pull tab. The larger compartment shall be configured to hold the heater, one polymeric food tray or ISP, and accommodate the activation fluid. The compartment shall be configured with a raised and rounded edge that s
20、upports the polymeric food tray securely above the heater. Dimensions of the heating tray shall be as specified in Figure 2. The tolerance for the angle measurements shall be + 1 degree. The tolerance for the linear measurements shall be + 1/8 inch. Provided by IHSNot for ResaleNo reproduction or ne
21、tworking permitted without license from IHS-,-,-MIL-DTL-32235/1A 4FIGURE 2. Heating tray D. Pull tab. The pull tab shall be constructed of a blend of low to medium density polyethylene or equivalent material and shall provide high strength characteristics under a wide range of environmental conditio
22、ns. The material shall withstand temperatures ranging from -20F to 160F without fracture or failure. Dimensions of the pull tab shall be as specified in Figures 3 or 4. The pull tab shall be configured with loading stations to support the three or four tray activation method intended for the heater
23、module. Each station shall be configured to retain the assembled activator strip and withstand a minimum pull force of 75 pounds. For a tab configured like the R16-4WCSHCERDG tab (Figure 3), the center strip of the activation fluid unit shall be inserted through the back opening of the tooth and eac
24、h of the two holes on the extending end of the activator strip are pressed onto this tooth until the edge of the strip is secured under both retaining teeth. For a tab configured like the RND-PT tab (Figure 4), the end of the center strip of the activating fluid unit shall be folded between the reta
25、ining holes and the tab inserted through the retaining station(s). Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-32235/1A 5Upon completion of the heater module assembly, the three or four center strips of the activation fluid units securely
26、 connect to a pull tab. At the time of use, the operator of the heater module pulls the pull tab to tear the activation fluid unit pouches which open and release the saline solution and activate the heaters. FIGURE 3. Pull tab, Rear loading design Provided by IHSNot for ResaleNo reproduction or netw
27、orking permitted without license from IHS-,-,-MIL-DTL-32235/1A 6FIGURE 4. Pull tab, Center loading design E. Assembly of heater module. The components or sub-units shall be assembled. The Type I heater module shall consist of a box containing three sub-units and a BIB module or four sub-units, with
28、activation mechanism/pull tab, and a barrier pouch containing three or four heaters. The sub-unit shall consist of the heating tray, the activation fluid unit, and the polymeric food tray. Sub-assemblies of components may be used. The three or four sub-units shall be stacked and the activation mecha
29、nism/pull tab shall be connected to the three or four activation fluid unit pull strips. The sub-units shall be placed into the heater module box. The entre polymeric food tray shall be on the bottom and the dessert polymeric food tray shall be on the top. When there is a BIB module, it shall be pla
30、ce on top of the three sub-units. A corrugated fiberboard pad measuring approximately 10-3/4 by 16-1/4 inches shall be placed on the top of the fourth tray sub-unit or the BIB module. The barrier pouch containing the heaters shall then be placed on the fiberboard pad inside the heater module box. Th
31、e heater module box shall be closed and instructions sheets applied. Design and dimensions of the heater module box shall be as specified in Figure 5. Each heater module shall be correctly and legibly labeled in accordance with MIL-DTL-32235. Provided by IHSNot for ResaleNo reproduction or networkin
32、g permitted without license from IHS-,-,-MIL-DTL-32235/1A 7FIGURE 5. Heater module box EXAMINATION AND TESTS A. Type I heater module examination. In addition to the heater module examination specified in MIL-DTL-32235, the finished product shall be examined for conformance to the requirements specif
33、ied in this specification sheet. The Type I heater module shall be examined for the defects listed in Table I. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-32235/1A 8TABLE I. Type I heater module defects 1/ 2/ 3/ 4/ 5/ 6/ Category Defect M
34、ajor Minor 101 Heater module not type or not style specified. 102 Heater does not contain materials that will initiate and propagate an exothermic reaction. 103 Heater causes excessive foaming or uncontrolled release of reaction by-products. 104 Three or four heaters, as applicable, not packaged in
35、a barrier pouch. 105 Center strip of activation fluid units not reinforced. 201 Packaged heaters not located in top area of the heater module box. 202 The corrugated fiberboard pad on top of the fourth sub-unit or BIB module missing. 203 Tear nick, notch or serrations on heater barrier pouch missing
36、 or does not facilitate opening. 106 Score lines on activation fluid units missing or damaged. 107 Fold-over flap on heating tray to retain the activation fluid unit missing or damaged. 108 Heating tray design or dimensions incorrect. 109 Activation mechanism/pull tab missing or damaged. 204 Activat
37、ion fluid unit center strip not attached to activation mechanism/pull tab. 205 Activation mechanism/pull tab not assembled properly. 206 Polymeric trays or ISPs or BIB, if applicable, of food not placed in module in correct order. 1/ Heater material construction shall be verified by Certificate of C
38、onformance (CoC). Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-32235/1A 92/ Use of MIL-PRF-131 material for the activation fluid unit shall be verified by CoC. 3/ The activation fluid solution shall be identified and verified by CoC. 4/ Th
39、e use of 0.090 inch high density polyethylene for the heating tray shall be verified by CoC. 5/ The pull tab material shall be verified by CoC. 6/ The pull tab pull strength shall be verified by CoC. B. Test methods. 1. Single heater capacity test. The objective of the heating capacity test is to ve
40、rify that a single heater increases the temperature of the water in the polymeric tray by 85F (from 40F to 125F) in 30 minutes or less. In this test, one sub-unit (polymeric tray of water in the heating tray with the heater and the activation fluid unit) is tested. The following procedures are recom
41、mended: Pre-condition 96 oz. water-filled test tray to 35F to 40F. Align matching bi-metallic (copper-constantan) pegs of C-10 Locking Connector to bi-metallic holes in C-9 Locking Receptacle. Thread C-10 Locking Receptacle and C-9 together until seated. Connect Thermocouple wire installed on Lockin
42、g Receptacle to data acquisition or computer terminal calibrated to the copper-constantan thermocouple. Assemble heater and food tray within the heating tray. Add activation fluid or use activator pouch to activate heater. The test shall be conducted at an ambient temperature of 72F + 2F in an explo
43、sion-proof exhaust fume hood or sufficiently ventilated environment, away from open flame or potential ignition sources. Place sub-unit into a representative heater module box with a 10-3/4 by 16-1/4 inch corrugated insert placed over the tray (weather grade corrugated or plastic materials may be us
44、ed for repeated testing). Activate the sub-unit. Record temperature for at least 30 minutes at 1 minute intervals or more frequently. II. Notes. A. Part identifiers and sources of supply. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-32235/
45、1A 101. Heater. The heater is available from: Truetech Inc. 680 Elton Ave. Riverhead, NY 11901-2585 (631) 727-8600 2. Heater barrier pouch. The barrier pouch material is available from: Winter-Wolff International 131 Jericho Turnpike Jericho, NY 11753 (516) 997-3300 3. Activation fluid unit. The act
46、ivator pouch is identified as Part # HP-AP-003. The material CADPACK N for the construction of the activation fluid unit pouch is available from: Cadillac Products 5800 Crooks Road Troy, Michigan 48098-2830 (248) 813-8200 The filled and sealed activation fluid units are available from: Heritage Pack
47、aging 625 Fishers Run Victor, NY 14564 (585) 742-3310 4. Heating tray. The heating tray is available from: Transform Plastics 45 Prince St. Danvers, MA 01923 (978) 777-1440 Ecomass Technologies 4101 Parkstone Heights Drive Austin, TX 78746-7482 (512) 306-0020 Provided by IHSNot for ResaleNo reproduc
48、tion or networking permitted without license from IHS-,-,-MIL-DTL-32235/1A 115. Pull tab. The pull tab is identified as Part # R16-4-WCSHCE-4. The pull tab is available from: Southern Imperial 1400 Eddy Avenue P.O. Box 2308 Rockford, IL 61103 (800) 747-4665 x203 6. Thermocoupled polymeric trays. Filled thermocoupled polymeric trays or instructions on how to construct them are available from: US Army Research, Development and Engineering Command Natick Soldier Research, Development and Engineering Center RDNS-CEG 15 Kansas Street Natick, MA 01760-5056 (508) 233-4939 7. Assemb
