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Reinforcement Scrims (Grilles)

This product line is a Porcher Group specialty, and in Brazil has been in production since 1985.
They are constructed through the perfect combination of three fundamental components:

The raw material (type of yarn)
The construction (type and density)
The chemical impregnation (glue)

The raw material can be:

High tenacity polyester filament with a wide range of yarn number between 80 and 1100 dtex.
Glass filament also in different yarn numbers, being that the most used are those filaments with numbers 34 and 68 tex.
Other fibers can be used, such as Modal and Polyamide, but they are rarely used; they are indicated for very particular applications.
There is also the possibility of attaching to the scrim a Polyester non-woven, to a glass veil or to a film. In this case, the attached material will be glued to the scrim.


The process of producing these scrims consists of the insertion of weft yarn between two groups of warp lines, in an offset warp (I) or superposed (S), in special machines developed by the head office in France. The warp yarns are distributed transversally to the set of warp yarns.

The clamping between the warp and weft yarns is done by gluing at the crossings points (chemical bonding), and not by interlacing as in conventional weaving.  The set is immersed in a glue bath and then dried in a oven, forming in this manner a net in the shape of a square (or rectangle) or in tri-directional design (forming diamond shape).

The density or contexture of the reinforcement scrim is the quantity of yarn per centimeter, in the directions of warp and weft yarns, and can change according to the desired product. In the figure below there is an example.

The width of the roll of the reinforcement scrim can be chosen by the client, within the following limits: 400 and 2500 mm, with selvage cut or uncut.

The choice of the chemical product (glue) used in the impregnation of the yarn depends on the final use intended for the scrim. The products can be soluble in water or in solvent.

The two types most commonly used are:
Polyvinyl chloride (PVC)
lue with a Polyvinyl Acetate (PVA or PVAc) base

Other types that are also used:
EVA (ethylene vinyl acetate),
PUR (Polyurethane),
PVOH (Polyvinyl alcohol)


The reinforcement scrims are products meant for industrial use that provide better resistance and/or stability to the final product. Examples:
Technical adhesives (tapes)
Plastic films
Truck tarpaulins
Material for insulation (Kraft paper + scrim + aluminum)
Waterproofing membranes
Paper (envelopes, packages)
Plaster boards
Swimming pools (covers and bodies for children’s pools)
Reinforcement for PVC and textile flooring
Reinforcement for non-woven fabrics, etc.
   
Meaning of the letters in the description of this product’s code:
I = Single warp construction
S = Double warp construction
T = Tri-directional (diagonal) construction
ANC = Uncut selvage
They are 20% to 40% thinner than similar products made in conventional looms;
Better penetration of adhesives;
Improves the dimensional stability and breaking strength.


List of articles in standard production line in Brazil:

Product Code

Density lines/cm

Warp Yarn

Woof Yarn

Composition

I010

4 x 3

PES 153 dtex

PES 280 dtex

100% PES

I018

2 x 2

EC9 34 tex

EC9 34 tex

100% Glass

I019

3 x 3

PES 550 dtex

PES 550 dtex

100% PES

I020

3 x 3

PES 110 dtex

PES 110 dtex

100% PES

I030

3 x 2,5

PES 550 dtex

PES 550 dtex

100%PES

I034

1 x 1

PES 1100 dtex

PES 110 dtex

100% PES

I038

8 x2

PES 83 dtex

PES 80 dtex

100%PES

I059

4 x 4

PES 153 dtex

PES 140 dtex

100% PES

I070

2 x 2

PES 1100 dtex

PES 110 dtex

100% PES

I076

3 x 3

PES 550 dtex

PES 550 dtex

100% PES

I084

2 x 2

EC9 110 tex

EC9 110 tex

100% Glass

I085

1 x 1

PES 550 dtex

PES 550 dtex

100% PES

T063

3 x 3

PES 280 dtex

PES 280 detx

100% PES

T064

3 x 3

PES 550 dtex

PES 550 dtex

100% PES

T065

3 x 4

PES 1100 dtex

PES 110 dtex

100% PES

S001

0,8 x 0,8

PES 153 dtex

PES 280 dtex

100% PES

S087

2 x 2

EC9 68 tex

EC9 110 tex

100% Glass

Orientations about the use and handling of reinforcement scrims:
 
  Av. Caetano Ruggieri, 4153 - Itu - São Paulo - fone 55 11 4023-1966