APPLICATION TERMINOLOGY
PLASTIC TERMINOLOGY
PRINTING TERMINOLOGY
CONVERSION CHARTS
STOCK BAG SUGGESTIONS
METRIC CONVERSION CHART
FILM THICKNESS CONVERSION CHART

Email Us:
Info@Robar.com

 
 
 APPLICATION TERMINOLOGY
 

DIE CUTTING

 
  One of the more trendy uses of die cutting is often applied to the bag’s handle. By using the same, continuous substrate for both the handle and the bag, the design element makes a very modern, seamless fashion statement. The handles are oftentimes reinforced making it what is known in the industry as a “patch handle”. Die cutting can also be used for creating a window in the bag. This is often used in the packaging of food products.  
  EMBOSSING  
  The following are the types of embossing that we can specify:  
  Blind Embossing: Stamping done over a non-printed or foiled area in which the image is raised. This process calls for a die.  
  Blind Debossing: Stamping done over a non-printed or foiled area In which the image is lowered. This process calls for a die.  
  Embossed Hot Stamping: The process takes place during the foiling stage. The dimensional image is registered so that it matches up to the foil. This process also deems a die.  
  GLOSS and MATTE LAMINATES  
  Another highly popular application we offer are laminates. This process adds a thin layer of film over the bag which can give it either an extremely shiny appearance or a matte effect.  
  GROMMETS (EYELETS)  
 

In order to ensure the durability of the shopping bag and give it a more finished look, designers often choose to use grommets to attach the handles to the bag. We offer a variety of colored grommets to complement your design.

 
  HOT STAMPING  
 

Of the many applications we offer, one of the more popular is Hot Stamping. This process offers an excellent way to create a very upscale look at a minimum cost. We have a stunning palette of hot stamping foil colors to choose from including different golds, silvers, coppers and other assorted colors. This process can be applied to both paper and plastic substrates.

 
 

RIVETS

 
  In addition to grommets, we can also attached bag handles and augment your design with the use of rivets.  
>> Back to Top

 PLASTIC BAG TERMINOLOGY
  Cast Coated (Frosted) -   A process whereby a wet coating is press against a hot or warm metal drum giving it (in this case a plastic bag) an enhanced finish.  
 

HDPE

  (High Density Polyethylene) Most common use is for produce bags in grocery stores.  
  HDPE Frosted -   Bag tends to be more rigid due to it being a blend. It does not look like the above bag.  
  LDPE -   Low Density Polyethylene  
  Micron -   A measure of length; the thousandth part of one millimeter; the millionth part of a meter. This is a common measurement for width of plastics. If you want to convert from the American form of measurement of mil(s) to microns, you can multiply the mil by 25 to get to the number of microns.  
  PET   Polyethylene Terephthalate is a plastic resin used to make items like soft drink bottles, “custom” bottles and other consumer products. It is also used for film, oven trays, sheeting for cups, food trays and other uses.  
 

PP -

  (Polypropylene)  
  PVC   (Poly Vinyl Chloride) Often used for flexible see-through cosmetic bags.  
>> Back to Top

 PRINTING TERMINOLOGY
 

COLOR KEY

 
 

A color key is the proof that consists of four or more layers of film (yellow, magenta, cyan, black, and some custom colors perhaps) one color per film. The dot pattern on each is consistent with the dot pattern produced during the printing process. It is also viable for printing two color jobs. This process comes in handy for checking fit, registration, color breaks or adding 5 th and 6 th colors over matchprint proofs.

 
  FLEXO PRINTING  
 

Frequently used for printing on plastic, foil, acetate film, brown paper, and other materials used in packaging, flexography uses flexible printing plates made of rubber or plastic. The inked plates with a slightly raised image are rotated on a cylinder which transfers the image to the substrate. Flexography uses fast-drying inks, is a high-speed print process, can print on many types of absorbent and non- absorbent materials, and can print  continuous patterns such as gift wrap.

 
  4- COLOR PROCESS  
 

The subtractive primaries: yellow, magenta and cyan, plus black in four-color process printing. These four inks can combine to reproduce full-color artwork and designs.

 
 

HALFTONES OR SCREENINGS

 
 

This refers to the dot pattern that gives the art dimension- t he gray-colored tones halfway between shadows and highlights in a reproduced image.

 
  MATCHPRINT  
  A matchprint is a full color copy made from the actual negatives your file will be printed from. It is a good way to verify the color information.  
 

It is important to note that when you transfer colors from your screen to paper, some important things happen. First, your image is going from a backlit RGB (Red, Green, Blue) to a flat CMYK (cyan, magenta, yellow and black) with layer on layer of color on top of each other creating a more opaque look. So, colors that can be produced on the screen cannot be reproduced on paper or when printed.

 
  OFFSET PRINTING  
 

Any form of printing in which the ink transfer is not made directly from the plate to the paper. The offset is supplied by the use of a blanket (a large rubber roller). The plate transfers the ink to the blanket which, in turn, transfers the ink to the paper. The most common form is offset lithography (also the most common method of commercial printing overall). Letterpress and gravure are two other printing methods that can be offset. Offset lithography is distinguished from these two by the fact that there is no etched or raised surface on the plate; the separation of printing and non-printing areas is made chemically, rather than physically.

 
  PAPER QUALITY  
  This is a big factor in determining screen frequency. If the paper is porous, dot gain will obviate any detail that could be gained from using a high screen frequency. Papers come in a large variety of types and are intended for many different purposes. The basic types of paper we use and how they affect dot gain are as follows:  

  • Uncoated Paper - Any number of different paper types that are unvarnished. Dot gain for uncoated paper is roughly 12%.  
 

• Coated Paper - Paper that has been given a varnish coat. This helps to seal the paper and reduce dot gain (which runs at about 8%   on average). High quality grayscale and four-color images are printed on coated stock.

 
 

VARNISHES

 
 

After the printing is laid down on the sheet of paper, a varnish can then be put down over the printing. The options are an aqueous- or very shiny, ultra violet or UV which is exceptionally shiny or matte which gives the surface a smooth, non-reflective finish.

 
>> Back to Top

CONVERSION CHARTS
 STOCK BAG SUGGESTIONS
 SHOPPING BAGS - STOCK SIZES  MATERIAL/PRINTING OPTIONS

STYLE

WIDTH

DEPTH

HEIGHT

GEM

5 1/4”

3 1/4”

8 1/2”

VENO

5 1/4”

3 1/4”

13”

CUB / CHIMP

7 3/4”

4 3/4”

9 3/4”

DEBBIE / ANTELOPE

10”

5”

13”

ESCORT / GAZELLE

13”

6”

15 1/4”

SENIOR /IMPALA/

13”

7”

17”

LION

15”

9 1/2”

16 1/4”

VOGUE / JAGUAR

16”

6”

12”

CLASSIC / TIGER

16”

6”

15 3/4”

QUEEN / ZEBRA/

16”

6”

18 1/2”

JUMBO / HIPPO

18”

7”

18 1/2”

Medium:   Metallic, Art Paper, Art Board, Kraft, Kraft Groove, PVC, PET, PP, HDPE, LDPE, Corrugated, Canvas
Printing:   8-Color Capacity
Lamination:   Glossy, Matt or Other
Varnish:   UV (ultra-violet), Aqueous, Matt
Additional Processes:   Embossed (this will add a die charge), Hot Stamping
Bag Handles:   Cotton, Ribbon, Poly-Prop (Nylon), and Jute, Paper
Handle Attachment Options:   4-Knots (Standard), Grommets/Eyelets, Rivets
Bag Shape Options:   Square, Rectangular, and Trapezoid
>> Back to Top

 COVER BOARD STOCK  
 METRIC COVERSION CHART STOCK BAG SUGGESTIONS
GSM

 

Lbs.

Pt.

  190 gsm  

70 lb.

 

8 pt.

 

210 gsm

 

78 lb.

 

9 pt.

 

230 gsm

 

85 lb.

 

10 pt.

 

260 gsm

 

96 lb.

 

12 pt.

 

310 gsm

 

115 lb.

 

14 pt.

 

360 gsm

 

133 lb.

 

16 pt.

GSM lbs. Reccomendation

120 gsm

81 lb.

Best for medium size bags

150 gsm

106 lb.

Best for medium size bags

180 gsm

122 lb.

Best for large and oversize bags

>> Back to Top

  FILM THICKNESS CONVERSION CHART
MIL - INCHES - MICRON CONVERSION CHART

CHOOSING FILM THICKNESSES - Your decision regard the thickness of film is dependent on how much weight your bag will be holding. The following are some rules of thumb regarding this issue:

  • EXTRA HEAVY – Consider using a 6 mil for supporting the heaviest of content usage.
  • HEAVY - A 3 or 4mil bag is suggested for supporting heavy and rough objects.
  • MEDIUM - Everyday usage can be accommodated with a 1.5 or 2mil bag.
  • LIGHT - Lightweight objects such as t-shirts can be safely packaged using a 1 or 1.25mil bag. These are also most often what are used for produce in grocery stores.

FILM THICKNESS CONVERSION CHART
INCH MIL MICRON   INCH MIL MICRON
0.0003 0.30 7.26   0.001 0.95 24.13
0.00035 0.35 8.89   0.001 1.00 25.40
0.0004 0.40 10.16   0.0015 1.50 38.10
0.00045 0.45 11.43   0.002 2.00 50.80
0.0005 0.50 12.70   0.0025 2.50 63.50
0.00055 0.55 13.97   0.003 3.00 76.20
0.0006 0.60 15.24   0.0035 3.50 88.90
0.00065 0.65 16.51   0.004 4.00 101.60
0.0007 0.70 17.78   0.0045 4.50 114.30
0.00075 0.75 19.05   0.005 5.00 127.00
0.0008 0.80 20.32   0.0055 5.50 139.70
0.00085 0.85 21.59   0.006 6.00 152.40
0.0009 0.90 22.86   0.007 7.00 177.80

>> Back to Top