Benefits of PVDC over PVC as a pharma packaging material
Pharmaceutical PVC hard sheet has a very important role in pharmaceutical packaging, many pharmaceutical manufacturers will choose this material as pharmaceutical packaging. With the development of technology, people have improved the pharma PVC hard sheet, upgraded to the medicine PVDC hard sheet, the improved drug packaging material has a lot of improvement than before, today I will share with you the latter than the former what highlights.
PVC molded film is called rigid PVC because it contains almost no softeners and plasticizers. Free of plasticizers, PVC blister can provide structural rigidity and physical protection for pharmaceutical dosage forms. The blister cavity must be kept accessible by the push-through effect, and the formed mesh does not collapse when pressed. This is why the thickness of the PVC sheet is usually chosen between 200μ and 300μ, depending on the cavity size and shape.
Most PVC sheets used for medicinal blister covers are 250µ or 0.250 mm thick. Oxygen transmittance (OTR) is typically about 20 cc/m2/ day. In order to overcome the problem of insufficient barrier performance of PVC film, PVDC can be coated or combined with PCTFE or COC to increase the protection performance. Pvc-based multilayer blister films are commonly used for pharmaceutical blister packaging, in which PVC acts as the thermoforming skeleton of the structure. PVC layers can be tinted with pigments and/or UV filters.
Polyvinylidene chloride (PVDC) coated PVC. PVDC plays a key role in blister packaging as a laminating or coating on PVC. PVDC can reduce the gas and water permeability of PVC blister packaging by 5-10 times. The thickness of PVC film is 8-10 mil; The PVDC coating is 1-2 mil thick. The coating is applied on one side, usually facing the product and capping material.
While PVDC is excellent at blocking both oxygen and water vapor, most other blocking polymers provide only one or the other. Gas barrier properties are not affected by relative humidity and can depend on a wide range of packaging and environmental conditions.
Virtually all PVDC products on the market are copolymers of vinylidene chloride (VDC) and other comonomers. The relative amount of VDCS in copolymers determines some key properties. The larger the VDC, the better the barrier performance is generally, and the less the VDC, the more flexibility is generally improved. However, the number and type of comonomer, as well as other additives and processing techniques used, can affect other properties, such as sealability, surface properties, transparency, gloss coefficient of friction.
ST common duplex (PVDC/PVC) and triplex (PVDC/PE/PVC) configurations have been used for PVDC coatings. Approximately 67% of the barrier bubble pack market uses these PVDC coated films. Typical coating weights used include 40, 60, 90, and 120g/m2, and a typical 120g/m2 PVDC coated PVC film has a WVTR of about 0.16 g/m2 at 40 oC and 75% RH.
With the maturity and development of production technology, the production requirements of PVC PVDC will become more and more stringent. As a manufacturer of medicinal packaging materials, Huawei Aluminum will definitely standardize the production process and provide better quality medicinal packaging aluminum foil.