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Soft packaging plant to do these 6 points, no longer afraid of peeling strength is low!

Browsing times:253Release time:2016-07-20

Appeared in low peel strength is usually caused by the following aspects: material slippery agent and opening agent ratio is too high, corona treatment failure, poor adhesion of the oil ink, ink consumption of curing agent and aluminized film aluminized layer transfer. For these reasons, the soft plant should pay attention to the following matters.
1, surface tension test
Film surface tension test is very necessary, for pet or BOPA polar materials due to the film surface itself has a higher surface tension, so even if no corona treatment can also achieve better strength of the composite, but such as BOPP film itself is a non-polar materials, surface tension is not up to the requirements of the composite, and therefore must be on the composite surface corona treatment, also with the time and environment variation in surface tension will gradually decay, so for non-polar materials before use must be to detect the surface tension, especially stored for longer periods of time in the materials used should be particularly noted.
2, reasonable control on the plastic set
Glue content control is important in the process of composite, for the general production costs to consider actual production process glue would control in theory require numerical partial index, but on the formulation of the sizing process is not able to static, need to make appropriate adjustments based on thin film type and thickness, the ordinary composite control in 2.0g/m2 2.5g/m2, for composite thin aluminum products, glue quantity to control in more than 3.5g/m2, for heat sealing layer thickness in more than 60 mu of materials, especially in open smooth agent to add higher amounts to an appropriate increase in the quantity of cement, usually to control in the 3.0g/m2. Above, in addition to the need to cook the material, due to the peeling strength required to reach more than 5N/15mm, so the amount of glue on the need to control in 4.5g/m2. Above。
3, choose a stable supplier
Both the film substrate and ink, adhesives, should choose some domestic and foreign well-known supplier, because these manufacturers with advanced production equipment, testing equipment, stable production technology and strong technical support, product quality is part of the small manufacturers more reliable.
4, aluminum composite products process control
(1) control of the amount of glue
Under the precondition of ensuring the effect of composite appearance, glue quantity should not be too high, general control between the 2.0g/m2 2.5g/m2, because excessive amount of coating will lead to hard composite film, making the aluminized layer transfer.
(2) choose special aluminum composite adhesive
Adhesive manufacturer for aluminized film characteristics of specialized research and development of specific adhesive, smaller molecular weight of this kind of adhesive can be through pinholes in the aluminized layer the aluminized coating and film between higher binding force.
5, curing temperature and time control
Aluminum composite materials in the formulation of curing process due to the inner layer material shrinkage damage factors of aluminum layer, curing temperature than the average product to low, aging time need to strictly control and general curing temperature is controlled at about 40 DEG C, ripening time control in 36 hours, under the environment of high temperature, curing at room temperature can be considered.
6, control the amount of curing agent
After fully test the premise may be appropriate to reduce the glue percentage of curing agent added, is generally less 5%, but this method for the full version of polyurethane printing ink film is not recommended to use, due to the hydroxyl in the ink curing agent consumption, so will produce glue curing phenomenon, cutting will produce end not neat or glue extrusion phenomenon, serious impact on product quality.

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