Papel de Transferência Térmica A4: Um Guia do Comprador

A4 thermal transfer paper is often used to refer to a number of materials which function in entirely different ways. Direct thermal A4 sheets, ribbon-based thermal transfer labels, garment transfer paper, tattoo stencil sheets and PCB toner-transfer paper are virtually the same product name that the buyer is likely to come across.

The desired image life, correct paper feeding and no paper jams would therefore not be guaranteed if only ordered by keyword. The starting points for procurement should be based on the printer mechanism, the final application and not only the A4 dimensions.

A4 direct thermal paper is a popular choice for businesses when it comes to portable printing and logistics records. A ribbon type thermal transfer material is typically more suitable for use in durable barcodes and industrial identification.

Explain the meaning of What A4 Thermal Transfer Paper.

A4 is a sheet of paper sized 210 × 297 mm but it does not specify how the paper makes an image.

Thermal paper is used directly, which means that it has a heat-sensitive coating. Thermal head in the printer activates this coating to form an image without the use of ink, toner or ribbon. It's popular for on-the-go documents, delivery logs, field service reports and mobile office printing.

Thermal transfer printing is the true thermal transfer method using a ribbon. The heat of the printhead is used to transfer wax, wax-resin or resin ink from the ribbon to a paper or synthetic surface. This approach is typically used when the image needs to withstand handling, abrasão, moisture or storage over a long period of time.

These materials are not the same and cannot be substituted for each other. Before requesting a quotation, buyers shall state the following information: Printer Model, Media Path, Printing Method and Application.

Print the first page: Printer Mechanism

The main issue of compatibility is the type of printer: direct thermal imaging, thermal transfer ribbon, laser toners or inkjet inks.

Standard copy paper will not produce a picture with a direct thermal printer because there is no heat reacting substance in the paper. This may increase the cost but not provide the added durability desired, as a ribbon-based printer may be able to feed direct thermal media.

Jinbao's explanation of direct thermal vs thermal transfer paper is a good place to start to differentiate the two types of printing mechanisms.

Assess Coating Uniformity & Image Formation

Print performance for direct thermal A4 paper is as a result of the interaction between the base paper, pre-coat, thermal layer and printer setting.

If the coating is not even, it may result in uncolored areas, uneven edges on the bar code or high energy use. Loose fibers and coating residue can build up on the print path and can be a factor in printhead wear.

In this technical discussion on Papel de Cópia Térmica A4, Jinbao elaborates on the relationship between surface roughness, coating coverage and distribution of coating particles and contact between the printhead and the media, as well as the imaging consistency.

Buyer's actual printer settings should be used in a production trial. A sample that prints well at low speed might not print like that during continuous field or logistics operation.

Make sure that Match Image Life is set to the Application.

Not all documents need to be as hard wearing. A delivery confirmation that is used for a few days does not have the same requirements as a medical record or warehouse label that will have to be read for months.

If long term abrasion resistance, moisture or chemical resistance is required, a Etiqueta térmica de transferência using an appropriate ribbon could be more appropriate than direct thermal A4 paper.

The choice of the appropriate decision depends on the needed service life and the environment in which the document is to be used and not upon the idea that one thermal material is suitable for all documents.

Confere Feeding, Flatness and Cutting Accuracy

The printing isn't the only area that A4 paper excels in. Sheets need to also go in, roll through and come out of the printer constantly.

Some parts of the material might not be cut straight and this causes material to be misaligned during feeding, or curled edges could get into contact with the printhead. Paper that is too soft will buckle when in the compact printer, while too stiff paper may not conform to a media path curve.

The bulk evaluation should consist of:

• Actual sheet dimensions
• Diagonal squareness
• Edge cleanliness
• The direction of curl and the intensity of the curl
• Sheet flatness
• Thickness consistency
• Static buildup
• Success with feedings across several packs.

For a high volume order, Testes 5 ou 10 sheets is not enough. Buyers need to monitor a larger sample through a number of printers and note jamming, skewing, density variations and residue.

Provides review of Safety and Market Compliance

For the target market and the application, thermal paper chemistry should be considered. If the documents that the business uses frequently are used by employees or customers, the buyers can ask for BPA or BPA/BPS free documents along with test documentation.

Relevant supplier documents could include:

• Product specification sheet
• Segurança / Chemical compliance declaration
• BPA/BPS test report (if necessary)
• Documentation of RoHS / CHEGAR.
• FSC chain-of-custody information
• ISO quality-system certification
• Batch inspection records

Jinbao issues the paper certifications it has available and the global standards, such as ISO, FSC, Livre de BPA, RoHS, SGS and TUV related paper. Buyers should still check the actual A4 thermal paper specification they are purchasing with which certificate they are covered.

Before and After Printing Control Storage

Thermal media should be kept in a closed system until use, and protected from heat, direct sunlight, moisture and aggressive chemicals. Printed images can be affected by PVC folders, oils and solvent-based cleaners although the paper might have passed inspection.

Some warehouse controls are recommended, como:

• Storing cartons in a dry inside space.
• Avoiding direct contact with floors and exterior walls (walls or walls and floors combined)
• Implementing the policy of "primeiro em, primeiro a sair" (FIFO) with respect to inventory rotations.
• Keeping the original protective packaging.
• Differentiation between thermal media and chemicals/plasticizers
• Taking note of batch number during receiving inspection

Records should also be kept based on the retention period required for a given record, and should be printed. For documents intended to have a long shelf life, the buyer should confirm archival performance or choose an alternative printing technique.

Final Buying Decision

The first step to selecting A4 thermal transfer paper is to clear up the confusion over the product name. As a first step, it is up to the buyer to decide whether the application will use direct thermal paper, ribbon-based thermal transfer media (TTM) or other transfer media.

Então, as a single system, Compatibilidade com impressoras, Uniformidade do revestimento, Vida da Imagem, Estabilidade de alimentação, compliance and packaging should be tested. If a material were to be used which created a dark image and jam often or which faded in the target environment, it would not be a successful specification.

Jin Bao Brother could look into the information of printer, application conditions and packaging requirements prior to making samples for compatibility testing for bulk sourcing of thermal paper A4.

Perguntas Freqüentes

Q1. Are A4 thermal transfer paper and A4 direct thermal paper the same?

Not always. There are two types of thermal paper printing – direct thermal paper (which creates an image by using a heat-sensitive coating) and true thermal transfer paper (which prints by using a ribbon that transfers a pattern of ink to the media).

Q2. Does it need any ink or ton? A4 thermal paper.

Direct Thermal A4 paper doesn't need ink or toners. Ribbon based thermal transfer media will need a compatible thermal transfer ribbon.

Q3. Is it possible to use A4 thermal paper in normal laser printer?

Unless it is stated that the supplier and printer manufacturer are compatible, it should not be used. The thermal conditions used in laser printers are different and their suitability for various media.

Q4. What testing should be done prior to bulk ordering?

Check image density, alimentação, sheet flatness, cutting accuracy, printhead residue and durability of the image. The actual printer model and production settings are recommended for use in trials.

Q5. Is it possible for A4 thermal paper packaging to be customized by Can Jin Bao Brother?

Jin Bao Brother is able to supply bulk and OEM packaging. Final availability to be confirmed subject to the paper specification, order quantity and order destination market.