ARMY MIL-DTL-32235 2 A-2010 HEATER MODULE TYPE II HEATER ASSEMBLED.pdf

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1、 MIL-DTL-32235/2 15 September 2010 INCH-POUND DETAIL SPECIFICATION SHEET HEATER MODULE, TYPE II: HEATER, ASSEMBLED This specification is approved for use by all Departments and Agencies of the Department of Defense. The requirements for acquiring the product described herein shall consist of this sp

2、ecification sheet and MIL-DTL-32235. CLASSIFICATION Heater modules are of the following styles: Style A - Three sub-units plus a Boil-In-Bag (BIB) module Style B - Four sub-units REQUIREMENTS I. Heater module. The Type II heater module shall consist of a heater module box containing three or four he

3、ating trays, activation fluid units, heaters, polymeric food trays or Institutional Size Pouches (ISP) and the activation mechanisms/pull tabs. Sub-assemblies are allowed. When applicable, there shall also be a Boil-In-Bag (BIB) module. The components and sub-units shall be assembled and the activat

4、ion mechanisms/pull tabs shall be connected to the three or four activation fluid units and to the three or four heaters. The sub-units and the BIB module (when applicable) shall be placed into the heater module box. AMSC N/A FSC 8970 Provided by IHSNot for ResaleNo reproduction or networking permit

5、ted without license from IHS-,-,-MIL-DTL-32235/2 2A. Heater. The heater shall be constructed of materials that, when activated by a fluid, shall initiate and propagate an exothermic reaction suitable for use with food. This reaction shall generate adequate heat to heat the food to a safe food servin

6、g 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 while allowing for adequate heating and ensuring operator and consumer safety. The heater material shall be evenly distributed a

7、nd 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 rate shall be optimized to minimize the time required to heat the food, yet not cause excessive foaming or uncontrolled rele

8、ase 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 fully activate the heater material. The non-woven porous polymeric scrim shall be sealed and sized to accommodate proper fit an

9、d function of the heater module. Each heater (heater elements in a matrix) shall be correctly and legibly labeled in accordance with MIL-DTL-32235. The heater shall be placed in the bottom of the heating tray, covered and hermetically sealed in place with a layer of barrier material to the bottom of

10、 the tray with a peelable seal. The barrier material shall be scored (laser or mechanical) and shall be attached to a pull strip to enable activation. B. Activation fluid unit. The unit consisting of the pouch containing the activation fluid shall be made of material equivalent to Class 1 of MIL-PRF

11、-131. Alternate activation fluid pouch materials and designs 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 shall be

12、 + 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 center

13、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 1.5 per

14、cent 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 exothermic rea

15、ction. 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-32235/2 3FIGURE 1. Activation fluid unit C. Heating tray. The heating tray shall be mol

16、ded 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 activation flu

17、id 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 fluid un

18、it 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 support

19、s the polymeric food tray securely above the heater. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-32235/2 4Dimensions of the heating tray shall be as specified in Figure 2. The tolerance for the angle measurements shall be + 1 degree. The

20、tolerance for the linear measurements shall be + 1/8 inch. FIGURE 2. Heating tray D. Pull tabs. The pull tabs 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 conditions. T

21、he material shall withstand temperatures ranging from -20F to 160F without fracture or failure. Dimensions of the pull tabs shall be as specified in Figures 3 or 4. The pull tabs shall be configured with loading stations to support the three or four tray two-step activation method intended for the h

22、eater 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 a

23、nd each of the two holes on the extending end of the activator tab are pressed onto this tooth until the edge of the strip is secured Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-32235/2 5under both retaining teeth. For a tab configured li

24、ke the RND-PT tab (Figure 4), the end of the center strip of the activating fluid unit shall be folded between the retaining holes and the tab inserted through the retaining station(s). The second pull tab shall be assembled to the heater pull strips in a similar configuration. Upon completion of th

25、e heater module, the three or four center strips of the activation fluid units securely connect to a pull tab, and the three or four pull strips of the packaged heater securely connect to another pull tab. At the time of use, the operator of the heater module pulls the pull tabs to expose the heater

26、s and 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 networking permitted without license from IHS-,-,-MIL-DTL-32235/2 6FIGURE 4. Pull tab, Center l

27、oading design E. Assembly of heater module. The components or sub-units shall be assembled. The Type II heater module shall consist of a box containing three sub-units and a BIB module or four sub-units, with activation mechanisms/pull tabs. The sub-unit shall consist of the heating tray with sealed

28、-in heater, the activation fluid unit and the polymeric food tray or (ISP). Sub-assemblies of components may be used. The three or four sub-units shall be stacked and one activation mechanism/pull tab shall be connected to the three or four activation fluid unit center strips and the other activatio

29、n mechanism/pull tab shall be connected to the three or four heater pull strips. The sub-units and the BIB module (when applicable) 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

30、a BIB module, it shall be placed on top of the three sub-units. Corrugated fiberboard pads or cushioning shall be packed as necessary to fill excess headspace. The heater module box shall be closed and instruction sheets applied. Design and dimensions of the heater module box shall be as specified i

31、n Figure 5. Each heater module 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-32235/2 7FIGURE 5. Heater module box EXAMINATION AND TESTS: A. Type II heater module exami

32、nation. In addition to the heater module examination specified in MIL-DTL-32235, the finished product shall be examined for conformance to the requirements specified in this specification sheet. The Type II heater module shall be examined for the defects listed in Table I. Provided by IHSNot for Res

33、aleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-32235/2 8TABLE I. Type II heater module defects 1/ 2/ 3/ 4/ 5/ 6/ Category Defect Major Minor 101 Heater module not type or not style specified. 102 Heater does not contain materials that will initiate and propagate an e

34、xothermic reaction. 103 Heater causes excessive foaming or uncontrolled release of reaction by-products. 104 Heater not hermetically sealed in tray with barrier material. 105 Center strip of activation fluid units not reinforced. 106 Score lines on activation fluid units missing or damaged. 201 Scor

35、e line on heater barrier material not provided. 202 Heater barrier material not connected to pull strip. 203 Heater pull strip not attached to activation mechanism/pull tab. 107 Activation mechanism/pull tab missing or damaged. 204 Activation fluid unit pull strip not attached to activation mechanis

36、m/pull tab. 205 Activation mechanism/pull tab not assembled properly. 108 Fold-over flap on heating tray to retain the activation fluid unit missing or damaged. 109 Heating tray design or dimensions not correct. 206 Polymeric trays or ISPs or BIB, if applicable, of food not placed in module in corre

37、ct order. 110 Excess headspace in module allowing movement of components. 1/ Heater material construction shall be verified by Certificate of Conformance (CoC). Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-32235/2 92/ Material in accordanc

38、e with MIL-PRF-131 for the activation fluid unit shall be verified by CoC. 3/ The activation fluid solution shall be identified and verified by CoC. 4/ The 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/

39、 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 verify 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 te

40、st, 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 recommended: Pre-condition 96 oz. water-filled test tray to 35F to 40F. Align matching bi-metallic (copper-constantan) pegs of C-10 Locking Connector t

41、o bi-metallic holes in C-9 Locking Receptacle. Thread C-10 Locking Receptacle and C-9 together until seated. Connect Thermocouple wire installed on Locking Receptacle to data acquisition or computer terminal calibrated to the copper-constantan thermocouple. Assemble heater and food tray within the h

42、eating 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 explosion-proof exhaust fume hood or sufficiently ventilated environment, away from open flame or potential ignition sources. Place sub-unit into a rep

43、resentative heater module box with 10-3/4 by 16-1/4 inch corrugated insert placed over the tray (weather grade corrugated or plastic materials may be used for repeated testing). Activate the sub-unit. Record temperature for at least 30 minutes at 1 minute intervals or more frequently. II. Notes. A.

44、Part identifiers and sources of supply. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-32235/2 101. Heater. The heater is available from: Truetech Inc. 680 Elton Ave. Riverhead, NY 11901-2585 (631) 727-8600 2. Heater barrier pouch. The barri

45、er pouch material is available from: Winter-Wolff International 131 Jericho Turnpike Jericho, NY 11753 (516) 997-3300 3. Activation fluid unit. The activator pouch is identified as Part # HP-AP-003. The material CADPACK N for the construction of the activation fluid unit pouch is available from: Cad

46、illac Products 5800 Crooks Road Troy, Michigan 48098-2830 (248) 813-8200 The filled and sealed activation fluid units are available from: Heritage Packaging 625 Fishers Run Victor, NY 14564 (585) 742-3310 4. Heating tray. The heating tray is available from: Transform Plastics 45 Prince St. Danvers,

47、MA 01923 (978) 777-1440 Ecomass Technologies 4101 Parkstone Heights Drive Austin, TX 78746-7482 (512) 306-0020 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-32235/2 115. Pull tab. The pull tab is identified as Part # R16-4-WCSHCE-4. The pul

48、l 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. Heating Tray with Heater. The heater sealed into a heating tray is available from: Ecomass Technologies 4101 Parkstone Heights Drive Austin, TX 78746-7482