Lacquers by Lewin Hong https://padlet.com/lewinyeowhong/lacquer Beh Yeow Hong, 120106 en-us 2016-11-12 12:27:19 UTC 2025-09-26 02:17:23 UTC hello@padlet.com https://padlet-assets.s3.amazonaws.com/icons/Lovecoffee.png Lacquers - Definition lewinyeowhong https://padlet.com/lewinyeowhong/lacquer/wish/137129470
Lacquers are inert organic coatings used to give additional protection to tinplate. It will applied in liquid form and ‘cured’ at high temperatures. 
]]> 2016-11-12 12:40:13 UTC https://padlet.com/lewinyeowhong/lacquer/wish/137129470 Disadvantages of lacquer in general lewinyeowhong https://padlet.com/lewinyeowhong/lacquer/wish/137131183 In lacquered cans, white fruit tends to darken which is unacceptably dark colour after 18 to 24 months. This darkening is caused by oxidation reactions.]]> 2016-11-12 13:24:32 UTC https://padlet.com/lewinyeowhong/lacquer/wish/137131183 Lacquers - Protective Coating lewinyeowhong https://padlet.com/lewinyeowhong/lacquer/wish/137131538 Cans may be unlacquered under certain condition. However, most of the food products are reactive and corrosive. Hence, internal lacquers were needed to:
  • Protect the food from can
  • Protect the can from food

The lacquers can be applied on external food can or internal food can.

The link provided showing the canning process and why the lacquers were added during this process.
]]> 2016-11-12 13:31:48 UTC https://padlet.com/lewinyeowhong/lacquer/wish/137131538 Advantages of lacquer in general lewinyeowhong https://padlet.com/lewinyeowhong/lacquer/wish/137131784
  • Masking sulphide staining.
  • Extend the shelf-life of product.
  • Prevent adhesion of can with product.
  • Reduce bleaching action of tin on colour.
  • Reduce the rate of dissolution of tin by corrosive product.
    • ]]>     2016-11-12 13:37:46 UTC https://padlet.com/lewinyeowhong/lacquer/wish/137131784     Characteristics of Internal Food Can Lacquers lewinyeowhong https://padlet.com/lewinyeowhong/lacquer/wish/137131966
  • Non-toxic
  • Economical
  • Easy to apply on tinplate
  • Do not affect colour of food
  • Do not affect flavour of food
  • Effective barrier between food and container
  • Have mechanical resistance to can manufacturing operation.
  • Do not peel off during sterilization and storage of canned food.
    • ]]>     2016-11-12 13:41:49 UTC https://padlet.com/lewinyeowhong/lacquer/wish/137131966     Type of Internal Lacquers For Food lewinyeowhong https://padlet.com/lewinyeowhong/lacquer/wish/137133740
  • Vinyl lacquer
  • Organosol lacquer
  • Epoxy-phenolic lacquer (Epoxy Resin)
  • Acrylic lacquer
  • Oleoresinous lacquer (Natural Resin)
    • ]]>     2016-11-12 14:22:48 UTC https://padlet.com/lewinyeowhong/lacquer/wish/137133740     Vinyl Lacquers lewinyeowhong https://padlet.com/lewinyeowhong/lacquer/wish/137134747 Advantages 
    • Very flexible
    • Good adhesion
    • Free from odour and flavour
    • Air-drying

    Disadvantages
    • Decompose at about 170'C - 185'C when contact with steel
    • Not suitable for products processed in steam and water above 100'C (will take up water and undergo blushing)
    • Cannot resists sterilizaion at high temperatures

    Application second lacquer for 
    • Beer, wine, carbonated beverages
    • Cakes, sweets and dry foods
    ]]>     2016-11-12 14:43:53 UTC https://padlet.com/lewinyeowhong/lacquer/wish/137134747     Organosol Lacquer lewinyeowhong https://padlet.com/lewinyeowhong/lacquer/wish/137135335 Advantages 
    • Very flexible
    • High temperature process resistant (better than vinyl lacquer)
    • Good coverage
    • Can be pigmented with aluminium

    Disadvantages
    • Cannot mixed with zinc

    Application
    • Full aperture tinplate easy-opening ends and on drawn cans
    ]]>     2016-11-12 14:55:21 UTC https://padlet.com/lewinyeowhong/lacquer/wish/137135335     Epoxy-phenolic lacquer lewinyeowhong https://padlet.com/lewinyeowhong/lacquer/wish/137135772
  • They are epoxy resins based on epichlorohydrin and bisphenol. 
  • Component is synthetic resin.
  • Vary additive may be incorporated.

    • Advantages
    • Gold lacquer
    • Goof flexibility
    • Good adhesion
    • Good chemical resistance (acid)
    • High heat stability
    • Minimum environment impact

    Disadvantage
    • Migration of bisphenol A into food content

    Application
    • Meat
    • Fruits
    • Fruit juices
    • Vegetables
    • Soup
    • Marinated fish

    For more information, you can click this link to read. Enjoy
    ]]>     2016-11-12 15:02:13 UTC https://padlet.com/lewinyeowhong/lacquer/wish/137135772     Oleoresinous lewinyeowhong https://padlet.com/lewinyeowhong/lacquer/wish/137136725
  • Modified with the addition of zinc oxide (prevent blackening)
  • Component is natural resin.

    • Subdivided to two groups :
    1. “R” enamels - protect the natural pigment of highly colored fruits. Examples:  Dark berries, red beats and red cabbage. 
    2. “C” enamels - prevent the discoloration of foods containing proteins. Examples : corn, peas, poultry and seafoods.

    The non-BPA coating are baked-on oleoresinous enamel and PET (polyethylene terepthalate) laminate technology. It can be used for non-aggressive food product such as dried beans. However, it is not available for food and beverage due to the limited use coating technology.
    ]]>     2016-11-12 15:18:19 UTC https://padlet.com/lewinyeowhong/lacquer/wish/137136725     General Types of Can Coatings lewinyeowhong https://padlet.com/lewinyeowhong/lacquer/wish/137147648 These are general types of can coating which obtained from a book. Here are the details of the book:

    Title: Food Science
    Authors: Norman N Potter
    Publisher: Springer
    Publish Place: New York
    Edition: 4th
    Chapter: 21 Food Packaging
    Page: 591]]>     2016-11-12 18:31:03 UTC https://padlet.com/lewinyeowhong/lacquer/wish/137147648     Acrylic lewinyeowhong https://padlet.com/lewinyeowhong/lacquer/wish/137148051
  • Good color retention
  • High resistance to heat 
  • Used only for exteriors
  • Provide internal protection as hard white coatings with an attractive ceramic and stain-free appearance.
    • ]]>     2016-11-12 18:38:30 UTC https://padlet.com/lewinyeowhong/lacquer/wish/137148051     Resin lewinyeowhong https://padlet.com/lewinyeowhong/lacquer/wish/141810265 No resin is compatible to all kind of food, Hence, it was normally used my mixing different type of resin.]]> 2016-12-05 17:09:12 UTC https://padlet.com/lewinyeowhong/lacquer/wish/141810265