PE Printing Polybag is the best material for contact with food, it's nontoxic, tasteless, odorless and within the hygienic standard of food packaging. PE Printing Polybag is the most frequently-used and important material of polybag.
We are a qualified packaging service supplier to companies like Apple, Samsung,and Kindle,for their product-related accessories such as Power Bank, Charger, Cable, Networking, Speaker, Keyboard, Mouse, Earphone, Headphone, Surge Protector, Cases, Screen Overlay, Handbag, LSG and MSG etc.
End products are distributed to North America, Europe, Australia and Asia, with US and UK as our primary end markets.
Negatives Before we start printing, we need positive negatives. What are the requirements for a good negative?
* The film base and polyester film of the film should be highly transparent.
* The film side should be on the front side of the film. We often find that some users use the film side is the negative side of the film, used for offset printing positive film, the use of this negative film printing quality will not be guaranteed. Because the silk screen printing plate requires the image of the film side of the film should be in close contact with the photosensitive layer of the film.
* Density (density = darkness) needs to be greater than D3. Offset printing uses less than D3 positive film, so the densitometer should be used to measure the density of the positive film.
* The density of images and texts on the negatives needs higher values. Hand carved masks should not be used as screen printing plates. The film should be made of a high hardness photographic film.
* Use a cleaner or dust-removal roller to clean the negatives before using them.
Wire Mesh Screen printing is not an ordinary fabric but a high-strength material with very tight tolerances. For example, we may all know that in a screen of 120 mesh/cm, there are 24,000 meters of wire per square meter, or 14400 holes per square centimeter, but in fact there is much more to this knowledge about screens.
SEFARPET1000 mesh has:
1. High tension 2. Lower tension loss High tension stability Good anti-wear properties 5. Lower water absorption 6. Good resistance to acid etching The screen weaving structure is also very important for screen printers. You can find the technical specifications you need in the technical documentation. What is the benefit of knowing all these data?
Let us look at the relevant data:
1. Wire diameter: It is the index that determines the final imaging capability.
2. Mesh/CM: The strength and possible tension of the screen can be determined because the effective cross-section and wire diameter of the screen per cm determine the relative stability of the screen. Both of these factors also determine all other parameters. Such as the thickness of the screen, the size of the opening of the screen, the open area ratio of the screen.
3. The thickness of the screen and the area of ​​the opening determine the amount of ink, and theoretical ink penetration volume.
Frame We all know very well that only a solid frame can control the entire printing process.
For example, the magnitude of tension loss and the degree of tension stability.
Stretching is as explained before. According to the average effective cross-section of the screen, each different screen has its maximum tension. Only use a well-maintained stretching machine to reach this maximum tension. Sometimes it is regrettable that some stretching machines are covered with a layer of dry adhesive mesh, rubber pads are harder than stones and cannot be closed horizontally.
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ShenZhen YaoLong Colour Printing Co., LTD. , https://www.ylprinting.com