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Process for applying polymeric coating on cork stoppers

A polymer coating, cork technology, applied in the direction of coating, liquid coating device on the surface, closure plug, etc., can solve the problem of no effect, achieve the effect of low barrier effect and migration reduction

Inactive Publication Date: 2014-01-22
AMORIM & IRMAOS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] Therefore, prior art methods for reducing the migration of colored substances from cork to beverages are essentially aimed at extracting TCA from the cork or limiting its migration into the beverage
The fact that cork has not yet successfully entered the market for white alcoholic beverages demonstrates that these approaches are not effective in addressing the migration of phenolic or polyphenolic compounds into these beverages

Method used

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  • Process for applying polymeric coating on cork stoppers
  • Process for applying polymeric coating on cork stoppers
  • Process for applying polymeric coating on cork stoppers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0083] Example 1 - Preparation of Polymer Formulation

[0084] Prior to step 1 of the invention, the polymer formulation for application on the cork was prepared. A preferred formulation is prepared using polydimethylsiloxane (PDMS) with vinyl groups, a crosslinker and a catalyst. The amount of catalyst added to the formulation was about 1% to make the final PDMS formulation compatible with human food (food grade).

[0085] In Tables 1 and 2 below, the main characteristics of the polymer formulation are described, respectively, as well as the percentage of each component based on the total weight of the formulation.

[0086] Table 1 - Polymer Formulations

[0087]

[0088] Table 2 - Weight Percentage of Formulation Components

[0089] components

Embodiment 2

[0090] Example 2 - Use of a PDMS coating on cork stoppers according to the method of the invention. Evaluation of the extraction of colored compounds after immersion treatment of treated plugs (Accelerated Regimen)

[0091] This example concerns the use of a PDMS coating of the type defined in example 1 on cork stoppers by the method of the invention. PDMS polymer suspensions were prepared by adding crosslinkers and catalysts to PDMS according to Example 1.

[0092]Film deposition has been done on 100 corks by immersion in a mixing rotating drum for about 15 minutes at room temperature of about 20° C. (by the method of the invention). The plugs were washed and exhibited a moisture content of about 15% prior to tumble mixing.

[0093] After this first step, the cork is placed in a hollow perforated rotating drum to cure the film. The temperature of the rotating drum was 60°C and the temperature transition rate was set at 3°C / min until the temperature reached 90°C. Next, the...

Embodiment 3

[0098] Example 3 - Use of a PDMS coating on cork stoppers according to the method of the invention. Evaluation of the extraction of colored compounds from treated conventional plugs (Normal Regimen)

[0099] The conditions for using the method of the present invention are the same as those for the aforementioned assays.

[0100] After using the method as in Example 2, the resulting coated stoppers were stoppered to seal bottles containing different white alcoholic beverages.

[0101] A bottle containing agave, vodka, gin and a hydroalcoholic solution similar to Example 2 was used. The evaluation was carried out under the normal protocol, ie the evaluation of treated and untreated corks in bottles. In this way, non-accelerated conditions are used to extract those undesired compounds of the beverage.

[0102] Figure 2 to Figure 5 Several graphs are shown of the absorbance at 420 nm as a function of time for several beverages in contact with treated plugs (PDMS) and untreate...

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Abstract

The present invention discloses a process for applying a polymeric coating that provides an efficient barrier effect to the migration of coloured compounds, namely polyphenols, from the cork stopper into a white alcoholic beverage. For this effect the process of the invention comprises the steps of: 1) depositing a polymeric film on cork stoppers to provide a non-cured polymeric coating on the stoppers; 2) gradual curing of the polymeric coating by applying a temperature variation rate in the range of about 3 DEG C / min to about 6 DEG C / min, in order to gradually raise the temperature from about 40 DEG C to about 110 DEG C; and 3) final curing of the polymeric coating at constant temperature in the range of about 70 DEG C to 120 DEG C for at least 5 minutes. The efficacy of this coating will make possible the implementation at industrial level of cork stoppers in the market of white alcoholic beverages.

Description

technical field [0001] The present invention relates to a method for applying a polymer coating on cork stoppers, said polymer coating being based on cross-linked silicone resin (PDMS), to retard the migration of colored compounds from the stopper to alcoholic beverages. In particular, the methods of the present invention provide polymeric coatings that significantly retard the migration of phenolic / polyphenolic compounds from plugs to white alcoholic beverages. Background technique [0002] One of the most important uses of cork is sealing, namely natural cork, agglomerated cork, technical cork, champagne cork and cork with cap. These corks are widely used to seal alcoholic beverages. However, corks have not been successful in entering the market for white beverages with high alcohol content due to the yellowish color they impart to these beverages over time. [0003] Phenolic compounds (such as ellagic acid, gallic acid, and vanillin) and polyphenolic compounds (such as ...

Claims

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Application Information

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IPC IPC(8): B05D3/02B05D7/06B65D39/00
CPCB05D3/0209B05D3/0254B05D7/06B65D39/0058
Inventor A·M·马加良斯门德斯M·F·巴斯多斯奥利韦拉S·L·里贝罗庞泰斯
Owner AMORIM & IRMAOS
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