In Modern time of manufacturing of BOPP film,
Mostly 3 Layer and 5 Layer Extruded layer Films used.
Lets understand one by one and also difference between both.
1) 3 Layer extruded film -
in three layer extruded film, there are total three layer. Main layer is called core layer which is thick, extruded by main extruder, and bounded by two skin layer both side of it to enhance its property. Lets understand by picture given below
2) Five Layer extruded Film Plant-
In Five layer extruded film, there are total five layer. Main layer is called core layer which is thick, extruded by main extruder, and bounded by two skin layer extreme outside of it and two intermediate layers adjacent to it both side to enhance its property. Lets understand by picture given below
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ReplyDeleteHola a todos. Quisiera consultar si alguien ha trabajado con **laminación por extrusión de BOPP impreso sobre manta de polipropileno tejido (woven PP)**, ya que estamos observando diferencias de adhesión bastante marcadas según el tipo de BOPP utilizado.
ReplyDeleteNuestra estructura final es:
**Manta de PP / capa de extrusión / primer / tinta / BOPP**
El proceso actual es el siguiente:
1. Se imprime el BOPP.
2. Sobre el lado de la tinta se aplica una capa de primer.
3. Luego ese BOPP impreso se lamina por extrusión contra una manta de polipropileno.
El problema es que, en algunos BOPP, al realizar la prueba de adhesión o **peel test**, el film transparente se despega de la tinta y la tinta queda adherida del lado de la manta.
Esto nos hace pensar que la falla principal está en la interfaz **BOPP–tinta**, más que en la unión de la extrusión con la manta.
Lo interesante es que:
* con un BOPP de otro proveedor, usando la misma impresión, el mismo primer, la misma extrusión, la misma manta y la misma máquina, el sistema sí funciona bien;
* con otros BOPP, el desempeño baja bastante;
* la única variable que hemos cambiado ha sido el **film BOPP**.
Primers evaluados:
* **50% alcohol / 50% mica**
* **66.7% agua desionizada / 33.3% mica**
Con algunos BOPP, la fórmula con agua desionizada mejora un poco, pero con otros empeora.
Esto nos hace pensar que existe una diferencia importante en la superficie del BOPP, posiblemente relacionada con:
* anclaje de tinta
* tratamiento superficial real
* componente polar de la superficie
* compatibilidad con sistemas acuosos
* migración de aditivos superficiales
Dato importante:
medimos el tratamiento superficial con marcadores de **38 dinas**, y tanto los films que trabajan mejor como los que trabajan peor aparentemente pasan esa prueba.
Por eso sospechamos que el valor de **38 dinas** no está mostrando toda la diferencia real entre un BOPP y otro.
Quisiera consultar a quienes tengan experiencia en este tipo de proceso:
1. ¿Qué parámetros del BOPP consideran más críticos cuando ocurre una falla donde la tinta queda en la manta y el BOPP sale limpio?
2. ¿Han visto casos donde dos BOPP “pasan” 38 dinas, pero uno presenta mucho mejor anclaje de tinta que otro?
3. ¿Qué recomiendan evaluar además de dinas? Por ejemplo:
* ángulo de contacto
* componente polar/dispersiva
* slip / antiblock
* tipo de skin layer
* tratamiento corona o flame
4. ¿Qué tipo de primer les ha funcionado mejor en estructuras de **BOPP impreso + extrusion lamination + woven PP**?
5. ¿Han trabajado con primers base agua o con mica en este tipo de aplicación?
6. ¿Creen que el factor más crítico aquí sea la química superficial del BOPP, el anclaje de la tinta, o la compatibilidad entre tinta / primer / resina extruida?
Cualquier experiencia o recomendación técnica será de mucha ayuda, especialmente de quienes hayan trabajado con:
* reverse printing sobre BOPP
* extrusion lamination sobre woven polypropylene
* problemas de delaminación entre BOPP y tinta
Gracias de antemano.
Hello everyone. I would like to ask if anyone here has worked with **extrusion lamination of printed BOPP onto woven polypropylene fabric**, because we are seeing significant adhesion differences depending on the type of BOPP used.
ReplyDeleteOur final structure is:
**Woven PP fabric / extrusion layer / primer / ink / BOPP**
Our current process is:
1. The BOPP is printed.
2. A primer coat is applied on the ink side.
3. The printed BOPP is then extrusion laminated onto a woven polypropylene fabric.
The issue is that, with some BOPP films, during the adhesion or **peel test**, the transparent film separates from the ink, while the ink remains adhered on the woven PP side.
This leads us to believe that the main failure is occurring at the **BOPP–ink interface**, rather than at the extrusion-to-fabric interface.
What is interesting is that:
* with one BOPP from another supplier, using the same printing, the same primer, the same extrusion, the same woven fabric, and the same machine, the system performs well;
* with other BOPP films, performance drops considerably;
* the only variable we changed was the **BOPP film** itself.
Primers tested:
* **50% alcohol / 50% mica**
* **66.7% deionized water / 33.3% mica**
With some BOPP films, the deionized water formula improves the result slightly, while with others it makes the result worse.
This makes us think there may be an important difference in the BOPP surface, possibly related to:
* ink anchorage
* actual surface treatment level
* surface polar component
* compatibility with water-based systems
* migration of surface additives
Important note:
we measure surface treatment using **38 dynes markers**, and both the films that perform better and the films that perform worse seem to pass that test.
Because of this, we suspect that **38 dynes alone may not be showing the full real difference** between one BOPP and another.
I would like to ask those with experience in this type of process:
1. Which BOPP parameters do you consider most critical when the failure mode is that the ink stays on the woven side and the BOPP comes off clean?
2. Have you seen cases where two BOPP films both “pass” 38 dynes, but one shows much better ink anchorage than the other?
3. What would you recommend evaluating in addition to dynes? For example:
* contact angle
* polar/dispersive surface energy components
* slip / antiblock additives
* skin layer type
* corona or flame treatment
4. What type of primer has worked best for you in structures like **printed BOPP + extrusion lamination + woven PP**?
5. Have you worked with water-based primers or mica-based primers in this type of application?
6. In your opinion, is the most critical factor here the surface chemistry of the BOPP, the ink anchorage, or the compatibility between ink / primer / extruded resin?
Any technical experience or recommendations would be greatly appreciated, especially from those who have worked with:
* reverse printing on BOPP
* extrusion lamination onto woven polypropylene
* delamination problems between BOPP and ink
Thank you in advance.