The composite substrate is divided into printing base material, barrier material and heat sealing material.
The printing substrates should choose good mechanical strength, surface tension, printing
Adaptable, heat-resistant film material. Such as biaxial stretching
Acrylic Film (BOPP), Biaxially Stretched Polyester Film (BOPET), Double
To stretch nylon film (BOPA) and so on. Printed substrate mechanical properties
Reinforce heat seal strength, heat resistance flat against heat seal appearance
Whole action. The mechanical properties of the printing substrate are as follows: BO-
PA, BOPET, BOPP, so they are based on the same heat seal material
After the secondary compounding and bagging, the heat seal strength will decrease in turn. Printed substrate
The better the heat resistance, the better the flatness of the bag.
The barrier material has barrier properties, air tightness, moisture resistance, shading,
Anti-aromatic, excellent air permeability, etc.
Store contents. Such as biaxially oriented nylon film (BOPA), two-way
Stretched polyester film (VMALPET), aluminum foil, vinyl one
Vinyl alcohol copolymer film (EVAL), silicon coated film, polyvinylidene chloride
(PVDC) and so on.
Heat sealing material should have good heat sealing performance, chemical stability, and compliance
Health requirements, and have a certain degree of barrier. There are mainly polyethylene, polyethylene
Ep-coextruded film, polyethylene copolymer, polypropylene, and the like. Evaluation of heat seal material
Material performance indicators generally have tensile strength, elongation at break, right angle tear
Crack strength, surface roughness, haze, impact strength, friction factor, resistance
Puncture performance. Evaluate the heat sealing properties of the heat seal material
Warm seal, hot tack, heat seal strength, heat seal tensile state, anti-pollution
Heat sealing and so on. In order to meet the requirements of various packaging, meet the packaging machine
Machinery requirements, to meet the requirements for the production and storage of contents, need to be selected
Different heat seal materials. Cast polypropylene film (CPP) transparent
Degree, rigidity, oil resistance, moisture resistance, gas barrier, high temperature resistance than polyethylene
Efficient films are widely used in transparent food packaging and cooking bags.
For the continuous automatic filling of liquids, it is necessary to consider the use of heat
Good adhesion, anti-pollution heat sealable metallocene polyethylene (mPE) from
Sub-type resin (Surlyn). Because of the low temperature resistance of polyethylene film
Better than CPP, so it is widely used in frozen food packaging.