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Method of preparing a barrier film for blister packs

A technology for barrier films and substrates, which is applied to devices for coating liquids on surfaces, coatings, pre-treatment surfaces, etc., to achieve the effect of reducing cost and price

Inactive Publication Date: 2015-09-16
AGFA GEVAERT AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such a method results in a significant cost price reduction because fewer coating and drying steps must be performed to produce the film

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0088] Table 1

[0089] Coating Weight (g / m2) Wet layer thickness (μm) PVDC latex 20 38 50% dilution 30 38 Undiluted 30 58 50% dilution 40 51 Undiluted

[0090] Different drying conditions were used for each coat weight. The main drying parameters are drying temperature (Td), wet bulb temperature (T 湿球 ), relative humidity (RH) and air drying rate (α). The first three are related to each other according to the Mollier diagram.

[0091] Since the latex film forming temperature (Tf) of Diofan A736 is ±17°C, the drying temperature must be at least this temperature to ensure good film formation. The experimental drying equipment used in these experiments imposed some limitations on the operable window that could be investigated: a maximum drying temperature of 55 °C and a maximum relative humidity of 85%. The air drying speed was set at 6-8m / s.

[0092] The quality of the coatings was assessed by visually determining the number of...

Embodiment 2

[0109] Coating step 1 Coating Step 2 Coating Step 3 Coating Step 4 total coating [PVDC] g / m 2 [PVDC] g / m 2 [PVDC] g / m 2 [PVDC] g / m 2 Total [PVDC] g / m 2 INV-12 20 20 - - 40 INV-13 30 30 - - 60 INV-14 30 30 20 - 80 INV-15 25 25 20 20 90

[0110] The barrier properties, more specifically the water vapor transmission rate (WVTR), of the mud crack free PVDC coatings of the present invention have been determined. Standard WVTR measurements were performed according to ASTM F 1249 at "Xios Hogeschool Limburg" and "Permlabs" in Wiesbaden. The results are shown in Table 3. In Table 4, the WVTR values ​​of commercially available barrier films (PVC / PVDC films from Bilcare) are shown (taken from the parameter tables of these films).

[0111] Table 4

[0112] Substrate PVDC latex PVDC (g / m 2 ) WVTR INV-12 pvc Diofan A736 40 0.70 INV-13 pvc Diofan A736 60 0.48 ...

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PUM

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Abstract

A method for preparing a barrier film comprising the steps of: (i) providing a substrate; (ii) applying in a single coating step an polymer latex on the substrate to form a single layer of the polymer on the substrate; (iii) drying the single layer of the polymer; characterized in that the single layer has a dry coating weight (DCW) of at least 20 g / m 2 of polymer and is dried at a dry temperature (Td) of at least the film formation temperature (Tf) of the polymer latex at a relative humidity (RH) according to the following formula: RH = 15 + 1.25 * DCW .

Description

field of invention [0001] The invention relates to a method for producing a barrier film and the use of said barrier film in blister packs. Background of the invention [0002] Blister packaging is a term for several types of preformed plastic packaging used for consumer goods, food and pharmaceuticals. The main component of a blister pack is the cavity that holds the product, often referred to as a "pocket" or "blister". The blisters are usually obtained by thermoforming a flat, preferably transparent, plastic film. The blister holding the product is then sealed by the lidding foil. [0003] When used for pharmaceuticals, blister packs are designed to protect the product from the environment (moisture, O 2 , light) to ensure the physical and chemical stability of the product. The type of thermoformable plastic film and lidding foil used to make the blister pack determines the "barrier" properties of the blister pack against water vapor and oxygen. The cover foil is us...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J7/00C08J7/043C08J7/048
CPCC08J2327/16C08J7/047C08J2421/02C08J2323/06C08J2323/10C08J2367/02C08J2327/06C08J2427/08C08J7/0427C08J7/048C08J7/043B05D3/007
Inventor A.德普拉W.穆伊斯P.布里伊斯D.奎恩坦斯
Owner AGFA GEVAERT AG