1、NSF Protocol PI48 Cloth Towel Dispenser Systems NSF International January 30, 1995 NSF International, an independent, not-for-profit organization, is dedicated to public health safety and protection of the environment by developing standards, by providing education and by providing superior third-pa
2、rty conformity assessment services while representing the interest of all stake ho Ide rs. This Protocol is subject to revision. Contact NSF to confirm this revision is current. Users of this Protocol may request clarifications and interpretations, or propose revisions by contacting: NSF Internation
3、al Engineering & Research Services 789 Dixboro Road Ann Arbor, MI 48105 Phone: (734)769-8010 Telex: 75321 5 NSF INTL FAX: (734)769-O1 O9 E-mail: Web: January 30, 1995 Copyright O 1995 NSF International Page i NSF PROTOCOL PI49 CLOTH TOWEL DISPENSER SYSTEMS January 30,1995 Prepared By: NSF Internatio
4、nal Engineering & Research Services 789 Dixboro Road Ann Arbor, MI 48105 8 Copyright 1995 All Rights Reserved January 30, 1995 Copyright O 1995 NSF International Page ii TABLE OF CONTENTS PAGE SECTION 1 . INTRODUCTION 3 1 .O Background 3 1 . 1 Scope 3 1.2 Purpose . 3 1.3 Limitations . 3 SECTION 2 .
5、DEFINITIONS 3 SECTION 3 . REQUIREMENTS . 4 3.0 General 4 3.1 Cleaning 4 3.2 Corrosion Resistance 4 3.3 Sanitary Operation . 4 3.4 Power Source . 4 3.5 Activation of Unit 4 3.6 Operation and Installation Instructions . 5 3.7 Data Plate . 5 SECTION 4 . EVALUATION METHOD . 5 4.0 Inspection of Equipment
6、 . 5 4.1 Cleaning Evaluation Procedures . 5 4.2 Corrosion Resistance Procedures 5 4.3 Sanitary Operation . 7 4.4 Battery Operation . 8 4.5 Durability of Operation 8 APPENDIX A . REVIEW COMMITTEE COMMENTS NOT ADDRESSED IN PROTOCOL January 30. 1995 Copyright O 1995 NSF International Page iii 1 .o 1 .I
7、 1.2 1.3 2.0 2.1 NSF PROTOCOL PI48 CLOTH TOWEL DISPENSER SYSTEMS SECTION 1. INTRODUCTION Background: NSF International (NSF) is a not-for-profit independent third party testing and certification organization. The mission of NSF is to provide clients and the general public with objective, timely, thi
8、rd-party services at reasonable costs. NSF is best known for its role in developing standards and criteria for equipment, products, and services that pertain to the environment and public health. Scope: This protocol specifies the design and performance requirements for cloth towel dispensers. This
9、protocol is not an NSF or third-party consensus standard and it does not endorse the products or technology described herein. Purpose: NSF will use the data generated by this protocol to evaluate the test product and substantiate the following protocol certification: NSF Protocol P148 Cloth Towel Di
10、spenser Systems Limitations: The draft protocol shall be sent to a panel of experts for review, comment and suggestions. The protocol addresses the corrosion resistance, cleaning, and sanitary operation of the equipment. The use of the data and report generated from work completed under this protoco
11、l shall conform with the contract between the Client and NSF. SECTION 2. DEFINITIONS Accessible: Fabricated to be exposed for cleaning and inspection using simple tools (screwdriver, pliers, wrench, etc.). 2.0.1 Readily Accessible: Fabricated to be exposed for cleaning and inspect ion wit ho ut u si
12、ng too Is. Cleaning : Physical removal of accumulated substances. January 30, 1995 Copyright O 1995 NSF International Page 1 of 8 2.2 Corrosion Resistant: Capable of maintaining original surface characteristics under prolonged contact with the intended end use environment, and the normal use of clea
13、ning compounds and sanitizing solutions. 2.3 Contaminant: Undesirable organic and inorganic, soluble and insoluble substances in water including microbiological organisms. 2.4 Use Area: The area of the towel which is easily available to the user. SECTION 3. REQUIREMENTS 3.0 General: The unit shall b
14、e fabricated to withstand normal use, wear, nonabsorbent, and shall be easily maintained and serviced 3.1 Cleaning: The unit shall be designed to minimize the retention of moisture, dust, dirt and facilitate the inspection, servicing, maintenance, and cleaning. All surfaces in the towel path shall b
15、e constructed of smooth and durable surfaces without inclusions, pitting, or cracks and shall be accessible for cleaning. All joints and seams in contact with the unused towel shall be sealed. There shall be no exposed threads, studs, or external tooth washers in the unused towel path and all surfac
16、es in the unused towel path will be readily accessible for cleaning. 3.2 Corrosion Resistance: All materials used in the unit shall be corrosion resistant. 3.3 Sanitary Operation: The unit shall be designed to prevent contamination of the clean towel by the used towel and user contact with the previ
17、ously used towel. 3.3.1 3.3.2 3.3.3 3.3.4 3.3.5 The unit shall be designed so that a clean towel portion can be obtained by touching only clean unused towel and only a clean and unused towel is provided for each user. At the end of the drying operation, the used towel will be automatically withdrawn
18、 into the cabinet and any soiled towel outside of the cabinet shall be positioned outside of the use area. When the clean towel is exhausted, all towel shall be withdrawn into the cabinet to prevent re-use. Every user shall be provided a complete length of unused towel even if the previous user has
19、not extracted the towel to the stop. The dispenser shall be so designed to prevent contact between the clean and soiled portions of the towel and to prevent contamination, directly or indirectly, of the clean portion of the towel from the soiled portion of the towel. January 30, 1995 Copyright O 199
20、5 NSF International Page 2 of 8 3.4 Power Source (if applicable): Battery operated units must provide a means to assure adequate battery life for each loading of the dispenser. 3.5 Activation of Unit: Less than 5 Ibs force shall be required to activate the dispenser. 3.6 Operation and Installation I
21、nstructions: The manufacturer shall include with each unit a statement of guarantee, instructions on proper installation, recommended configurations for proper cleaning, operation, and maintenance. Drawings and parts list for identification and ordering of replacement parts shall be included with th
22、e equipment. The instructions for loading, maintenance, and cleaning shall be permanently posted inside each dispenser. 3.7 Data Plate: Data plates shall be permanent and securely attached to each production unit. The data plate shall be easy to read in English or the language of the intended user,
23、located on the equipment where it is readily accessible, and contain at least the following information: a. Equipment Name b. Model # c. Manufacturers name and address d. Electrical requirements - volts, amps, and Hertz (if any) e. serial number SECTION 4. EVALUATION METHOD 4.0 4.1 C C C C C C Inspe
24、ction of Equipment: Samples of equipment shall be inspected prior to, throughout and after testing to assure that the equipment meets the design, material and other requirements of this protocol. Two units shall be installed and operated in accordance with manufacturers instructions and shall be eva
25、luated using procedures 4.0 through 4.3.6. Cleaning Evaluation Procedures: The unit shall be evaluated by physical inspection. The technician shall perform the following procedures by sight and touch: Inspect the towel path for any surfaces which are rough, pitted, cracked, or contain defects which
26、would allow the retention of soil. Verify the ability to reach all areas of the towel path for cleaning without the use of special tools. Inspect the unused towel path for exposed threads, studs, external tooth washers or other protrusions which would harbor dirt and make cleaning difficult. Inspect
27、 the unused towel path for unsealed or rough seams. Verify that all surfaces in the unused towel path are readily accessible. Inspect the interior of unit for areas which would retain cleaning solution and prevent proper drying of the unit. January 30, 1995 Copyright O 1995 NSF International Page 3
28、of 8 4.2 Corrosion Resistance Procedures: Prior to beginning the evaluation, the manufacturer shall supply a complete set of blueprints, materialdparts list, “blow- apart“ drawing, and a sample unit for review. The review shall identify the materials and design issues (e.g. contact of dissimilar met
29、als) of concern. 4.2.1 Galvanic corrosion: All metals in electrical contact will be of the same composition and treatment, or the junctions will be tested for corrosion resistance in the presence of an electrolyte for 30 days. 4.2.2 Crevice corrosion: All seams shall be sealed or be subjected to cor
30、rosion testing in the presence of oxygen and an electrolyte for 100 days. 4.2.3 Materials Acceptance: Acceptance is based on either the use of materials given in Table 1, or satisfactory testing under 4.2.4. Table 1 Materials Considered to Have Satisfactory Corrosion Resistance For Use in Cloth Towe
31、l Dispensers Plastics Metals Acrylic-PVC alloys Stainless Steel, 18-8 Butadiene-acrylonitrile Stainless Steel, 31 6 Chlorinated poly(viny1 chloride) Chlorinated polyethylene Chloroprene Coated metal* Ch lorosu Ifonated polyethylene Ethylene propylene Fluoroelastomers FI uoroplastics Glass fiber rein
32、forced epoxy resins Isobutylene-isoprene Phenylene oxides Polyarylsulfone Polysu Ifone Poly(viny1 chloride) Vinyl chloride copolymers Stainless Steel, 12-1 7% Cr 14% Silicon I ron *Coatinas Vinyl U ret hane Chlorinated Rub ber 4.2.4 Corrosion Testing: Testing consists of a 3-day exposure to air and
33、each of the environments given in Table 2. The test material must meet the appropriate acceptance criteria as presented in sections 4.2.2.1 through 4.2.2.5. January 30, 1995 Copyright O 1995 NSF International Page 4 of 8 4.2.4.1 The acceptance criteria for metals is that the sample shall exhibit no
34、more corrosion than the control. The control shall be 304 stainless steel. The evaluation is based on visual inspection of the control and the test sample. 4.2.4.2 Plastics shall be evaluated in terms of chemical resistance rather than specifically corrosion resistance. Chemical resistance for plast
35、ics shall include factors such as swelling, weight change, color change, loss of mechanical strength, as well as observable surface attack. Swelling, color change, and surface attack are based on visual inspection in comparison with the control sample. WgtrJe shall not exceed I 0.1 Yo after exposure
36、, and mechanical properties of the test samples shall be at least 95% of the control values. 4.2.4.3 Coatings shall be tested after exposure to 1000 abrasion cycles under 1000 gram loads with CS-IO abrasion wheels. The evaluation is based on visual inspection of the control and the test sample. Tabl
37、e 2 Environmental Exposure Conditions - steam (1 hr exposure)/water (tap) - bleach (5 +1/-0% sodium hypochlorite solution) - 50“ 5% potassium hydroxide solution - 5 +1/-0% hand-use dishwashing detergent (e.g. Ivory Liquid) - 50“ 5% ethyl alcohol - 2 +0.5/-0.0% trisodium phosphate dodechydrate - 25“
38、5% acetic acid - 25“ 5% citric acid - 5“ 1 Yo ammonia 4.3 Sanitary Operation: The unit shall be tested with a full and 3/4 used towel for procedures 4.3.1 through 4.3.7. 4.3.1 Open the unit and inspect the path of the unused towel and the used towel to determine if the unused towel is protected from
39、 contamination by the used towel or areas contacted by the used towel. (This determines if the unused towel is protected from contamination from the used towel, Section 3.3.5). 4.3.2 Install a clean towel and operate the unit two cycles. 4.3.3 Mark the beginning of the exposed clean towel with perma
40、nent marker and cycle the unit. Observe the location of the marks to determine if they January 30, 1995 Copyright O 1995 NSF International Page 5 of 8 fall within the use area. (This determines if the previous used towel is within the unused towel use area, Section 3.3) 4.3.4 Before the unit retract
41、s, mark the beginning and end of the use area. After the unit retracts, observe if the area for extracting the clean towel is within the marked use area. Observe if the used towel area is withdrawn in a manner which reduces the possibility of contact with the next user. (This determines if the next
42、user can extract with reasonable ease, a clean towel without contacting used towel, Section 3.3.1 and 3.3.2) 4.3.5 Cycle the unit and measure the length of towel extracted. Allow the unit to complete the cycle. Extract approximately 2 of the normal extraction length and allow the unit to complete cy
43、cle. Then perform procedures 4.3.2 and 4.3.3. (This determines if the unit functions properly even if the previous user has not extracted the full length of towel, Section 3.3.4) 4.3.6 Measure the force required to initiate the extraction of clean towel with a spring scale. Repeat in triplicate. (De
44、termine activation force, Section 3.5) 4.3.7 Cycle the unit until all of the clean towel is extracted and note if all of the towel is withdrawn into the cabinet. (Determine if used towel is available to users when all unused towel is exhausted, Section 3.3.3) 4.4 Battery Operation (if required): Dra
45、in the batteries in the test unit until the batteries are at the failure point in the manufacturers battery life test and perform procedure 4.3.2 through 4.3.7. (This determines if the battery power source is adequate to properly operate the unit with minimal power, Section 3.4). 4.5 Durability of O
46、peration: Two units which have been field installed for at least a year shall be selected by the laboratory from a list of candidate units provided by the manufacturer. These units shall be submitted to verify the durability of the units by completing evaluation procedures 4.0 through 4.4 on each un
47、it. (This determines the durability of the design, Section 3.0). January 30, 1995 Copyright O 1995 NSF International Page 6 of 8 APPENDIX A REVIEW COMMITTEE COMMENTS NOT ADDRESSED IN PROTOCOL January 30, 1995 Copyright O 1995 NSF International Page 7 of 8 Responses to Reviewer Comments Not Addressed
48、 in the Protocol Comment Section 1.1 Scope, If NSF does not endorse the product and the product has the NSF seal this will cause significant confusion to regulators, industry, and cons u mers. Section 2.0 Accessible definition should be eliminated since it is the manufacturers intent to be able to c
49、lean without tools. Remove all reference to electrical operation or requirements since some of the units do not incorporate electrical or power requirements. Response The scope refers to the protocol itself. The protocol or NSF does not endorse any of the products or technology in the protocol. It is strictly a document which will be used to evaluate the products. If the products meet the requirements of the protocol then the products have met some of the requirements of NSF to endorse the product. The scope statement refers only to the protocol document. The protocol is written to cover th
