Heat Transfers and its application pp

Heat_Transfer_Application_Guide.pdf

Heat Transfers and its applications

It is designed to provide manufacturers with the necessary framework and tools tothe necessary framework and tools to successfully apply heat transfers on a variety of fabrics and surfacesof fabrics and surfaces

Manufactures who implement, maintain and improve on these requirements will realizeimprove on these requirements will realize best-in-class performance

Timer

This must be clearly visible.

This must trigger the release of pressure onrelease of pressure on the press.

The time must be accurate to +/-0.5 secondsseconds.

Pneumatic Pressure

The pressure The pressure gauge should be clearly visiblevisible.

The pressureThe pressure gauge must be in recognizable units e gunits, e.g. Bars/PSI/Kg cm²/N cm².

Digital Temperature Control

This must be clearly i iblvisible.

The temperature diff bdifference between display and heater plate must not exceed +/-5°Cexceed +/-5 C.

This must be linked to warning lights orto warning lights or sounds.

Machine bed (Platen) and pad material

The heat transfer press must have a silicone or rubber mat to provide a slightly deformable surface to ensureslightly deformable surface to ensure that pressure is distributed across the entire transfer.

All surfaces must be clean, undistorted and undamagedand undamaged.

Please replace or repair these surfaces when they become dirty, distorted or damaged.

To prolong the life of these materials, place cotton or Teflon over the base plate that can easily be replaced.

Inform the heat transfer supplier of the types of pad (e.g.: raised) and materials (e.g.: silicon) being used to help establish application parameters. .

Positioning

Where possible, the use of laser positioning is recommended to aid accurate registration duringaccurate registration during the heat transfer application.

Note: the use of chalk or Note: the use of chalk or baby powder is not recommended as this can interfere with the adhesioninterfere with the adhesion of the transfers

Heat Transfer Storage

Stored in packaging and not looseloose.

HT inventory should be used on a first in, first out ,basis (FIFO).

Stored with packing labels i t t If b t h t bintact. If batches are to be split, a copy of the packing label must be made and kept with each set of ptransfers from that batch. This will aid traceability of any problems if they should arise.arise.

Heat Transfer Storage

The heat transfer “Use by date” should be written ondate should be written on the label attached to each batch/lot of transfers. This should be used by the factory for stock rotationfactory for stock rotation and enabling transfers to be used within specified dates (if not provided, consult heat t f li ditransfer supplier regarding typical shelf life).

Stored at a temperature and Stored at a temperature and humidity specified by heat transfer vendor.

Heat Transfer Application

Th i f ti b l id The information below provides an overview of the necessary steps to prepare machinery verify the desiredprepare machinery, verify the desired settings, apply the heat transfers, and monitor the quality of the finishedmonitor the quality of the finished product

General Application instructions

Thi i f ti t i l d This information must include temperature, time, pressure, peel type (hot or cold) storage conditionstype (hot or cold), storage conditions and any other relevant information that will assist in the use of the heatthat will assist in the use of the heat transfer

Fabric/Heat Transfers “Specific” Application

instructions

An approved sample must also be supplied by heat t f d l ith th ifi li titransfer vendor along with the specific application instruction; this should be used as an application standard. The garment factory can reproduce reference samples to meet the needs of morereference samples to meet the needs of more operators working on same style.

Some minor adjustments to these specifications Some minor adjustments to these specifications maybe necessary due to different machinery, climate etc.

If adjustments are required and these exceed +/-5°C for temperature and +/-5 seconds for time, factories should consult with the heat transfer vendor.

Machinery

Ensure that the heat transfer press is sufficiently l h f th h t t f l t llarge enough for the heat transfer you plan to apply.

Regular maintenance of the heat transfer press is i d ll f h i i lrequired to ensure all of the critical parameters are

met. Recommendation is to calibrate every year externally and at start of each shift internally. Heat transfer machinery suppliers can provide specificationtransfer machinery suppliers can provide specification calibration requirements for your equipment.

Heat transfer operators must be adequately trained Heat transfer operators must be adequately trained on how to operate and set up the heat transfer press correctly.

Time, Temperature, Pressure, and Peel Type

Before starting, ensure that the time, temperature and pressure settings match the specific application instructions.

Ensure that heat transfer machine has fully reached the desired temperature setting.

After a break in production, the machine must be allowed to reach proper temperature; producing a few „blank‟ application cycles without a transfer will allow the heater plate to reach optimal temperature.

The temperature of the heater plate must be checked regularly (every 2 hours) throughout production. A digital thermometer and probe is recommended to give accurate reading.

The probe should be flat so as not to damage or be damaged by the pads.

Time, Temperature, Pressure, and Peel Type

The heat transfer press should reach the application temperature pp pin the allotted time for application (i.e.: it should not take 60s to reach temperature when the application time is 15s).

Heat transfer operators must wait the specified amount of time before peeling off the heat transfer backer.

Heat transfer operators must follow the peel type instructions provided by the heat transfer

d ( ld /t idvendor (e.g.: cold, warm/tepid, hot).

Record Keeping

A record should be kept of the required and actual application instructions (time, temperature, pressure and peel) for eachinstructions (time, temperature, pressure and peel) for each unique transfer application.

This should be kept next to the machine and should be filled in whenever the heat transfer press is checked as laid outwhenever the heat transfer press is checked, as laid out above.

The time, temperature, pressure and pad conditions should be ifi d t th t t f d ti t t i t l th h tverified at the start of production, at set interval throughout

production (2 hours), a change over of styles/design and after any stoppage in work over 5 minutes.

Using the digital thermometer, it is important to record the actual heater plate temperature, not the dial temperature.

Application

The heat transfers should always be placed in the centre of the base plate to ensure even pressure is givenof the base plate to ensure even pressure is given.

Fabric or material can be placed over the heater plate to protect the fabric/garment. This may change the heat p g y gplate face temperature.

Verify the temperature with a digital thermometer. If a diff i f d dj t th di l t t t t hdifference is found, adjust the dial temperature to match the required application instruction.

A raised pad (block) can be used to eliminate the A raised pad (block) can be used to eliminate the impression marks left by the heat transfers paper. Again this must be placed in the centre of the heat press to give the best and most even pressure.

Auditing and inspection

A standard operating procedure for the evaluation of applied heat transfers allows for:

The use of a common quality standard (accept / reject criteria) between heat transfer vendors, garment factories and Nike;factories, and Nike;

Standardized training of inspectors and auditors;

Standardized classification of defects to monitor trends and enable continuous improvement activities.

Work Area

Clean and well organized;

Minimal variation in temperature and humidity;

Use overhead cool white fluorescent (CWF) lighting with an illumination of at least 1075 lux (100 foot candles);

Provide for a viewing angle of 45 degrees (optional);

If possible provide back-lighting to assist with evaluating If possible, provide back lighting to assist with evaluating glue lines and other registration details (optional).

Work Area

Auditing and Inspection

Inspector Requirement

1.Have adequate unaided or corrected vision to evaluate fine detail;

2. Achieve a score of average or above using the Farnsworth Munsell 100 hue color acuity test;

3. Be able to correctly identify and assign defects using the codes described in this guide.

4. Have refresher training to re-evaluate items 1-3 at least every two (2) years.

Auditing and Inspection

Inspection Tools 1 A copy of this guide;1. A copy of this guide;

2. A copy of the defect code list (can be modified for translation purposes only);

3. A color copy of the approved production transfer artwork;

4. A copy of the transfer specifications indicating size and other py p gfeatures;

5. An approved sample of the heat transfer applied to a production representative garment or fabric swatch;production representative garment or fabric swatch;

6. The “Nike Heat Transfer Stretch” template;

7. Paper or electronic means of capturing inspection data.

Auditing and Inspection

Inspection Method

1. Placing the garment on the inspection surface with the heat transfer facing towards the observer at a distance of arm's length (approximately 45 – 60cm); ( pp y );

2. Visually inspect the transfer and surrounding fabric, comparing the heat transfer features against the approved reference sample and artwork;and artwork;

3. Record any defects*;

4. Use back-lighting if available to assist with inspection of glue lines and other details;

5 Repeat steps 2-4 for each heat transfer on the garment5. Repeat steps 2-4 for each heat transfer on the garment.

Auditing and Inspection

Inspection Method for Evaluation HT stretchstretch

1. Allow the applied transfer to condition for a period of time specified by the heat transfer vendor (usually between 8-36 hours) before performing the stretch test.

2. Grip the garment or panel approximately 1cm from the left and right outer edges of the transfer; this should be conducted at multiple points along the outer edges of the transfer if it is a tall transfer (see example b l )below).

3. Use the heat transfer stretch template to determine the amount of stretch to apply*.

4. Apply stretch and hold for 3-5 seconds.

5. Release the stretch and visually inspect the heat transfer for defects due to stretching (cracking, peeling, etc.)

Auditing and Inspection

Inspection Method for Evaluation HT stretchstretch

Evaluating heat transfer stretch at multiple locations:

Auditing and Inspection

Reporting and Record keeping � Supplier name

� Inspector name

� Inspection date

� Internal and external item / reference numbers (e.g. Nike Item #)

� Purchase order number

� Lot and/or batch numbers

� Production line information, if applicable

� Section for recording defects

Inspection reports should be kept for two (2) years.