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A scrim used in an art installation
A scrim used in an art installation

A scrim is a woven material, either finely woven lightweight fabric widely used in theatre, or a heavy, coarse woven material used for reinforcement in both building and canvasmaking.

Light gauzy material

A scrim or gauze is a very light textile made from cotton, or sometimes flax or other materials. It is lightweight and translucent, which means it is often used for making curtains. The fabric can also be used for bookbinding and upholstery.

Scrims have seen extensive use in theatre. There are several types used for special effects. The most common types are called sharkstooth scrim and Chameleon™ scrim. The effects of the two are similar with the major differences that Chameleon™ is possible to hang in panels and is better for front and rear projection. However, in theater a scrim can refer to any such thin screen, and is made out of a wide variety of materials. Sharkstooth Scrim is woven and earns its name because the weave resembles a set of triangles that resemble a shark's teeth with openings similar in size to a window screen's. Chameleon™ is a newer type of scrim which has been around since the 1990's. It is non-woven synthetic material, with irregular smaller sized holes.

The most common effects that sharkstooth and Chameleon™ are used for is the 'reveal effect', in which an actor or scene is made to appear or disappear by using the scrim and appropriate lighting. The other effects are projection, silhouettes (lifesize and sharp), shadow effects (shrink and grow the shadow) or lighting effects like skies.

The bobbinet/bobbinette is a type of scrim that has a hexagonal hole shape and comes in a variety of hole sizes. It is used for a number of lighting effects in the film and theatre industries.

Scrim is also used in clothing, usually covering the face or head. This allows the wearer to see out, while preventing others from seeing in. This may also be combined with camouflage to completely hide a person, such as a sniper.

A scrim was also an integral part of the Beijing Olympic Stadium in Beijing. It was the screen running around the top of the stadium during the opening ceremonies on which all kinds of scenes were projected. Li Ning also ran around it just before the cauldron lighting for 2008 Summer Olympics.

A scrim (also called a screen) is used as an acoustically transparent covering for a loudspeaker to protect the diaphragm and dust cap, or as an air filter element to protect the voice coil and other components of the transducer.

Applications to stage lighting

Scrims both reflect and transmit light. This means that if a light from a front-of-house position is shone at a scrim, then both the scrim and everything behind it will be lit. This can lead to a variety of interesting effects:

In general, anything that is lit will be seen on both sides of a scrim: scrims do not absorb light. Scrim can also be used in theatre in combination with a cyclorama or backdrop. The idea is similar to the other uses. When the drop is lit (or images or video are rear-projected onto the back of the drop), the images or colours projected are visible. However, when the drop is not lit, the images or colors will disappear. A scrim can also help dull the image, creating a greater sense of depth.

Another effect is caused by layering two scrims, or even by placing a mirror behind a scrim and lighting it: the familiar moire effect. This can often cause audience disorientation.

Reinforcement material

Shop windows in the United Kingdom extensively covered with scrim during the 1940-1941  Blitz
Shop windows in the United Kingdom extensively covered with scrim during the 1940-1941 Blitz
Scrim and sarking
Scrim and sarking

The technique of using scrim as a reinforcement occurs commonly in the manufacture of glass-fiber or carbon-fiber composites: scrim layers may cover the exterior surface of the carbon-fiber laminate for an improved protective surface. Jute scrim can reinforce plaster in sculpture, when casting or working directly in plaster.

A similar usage of the term is found in sailcloth manufacture, where scrim is a strong loose weave of fibres laminated into the cloth to provide extra strength and stability to sails.

In carpentry, scrim is a very heavy, coarsely-woven fabric (similar to hessian or to coarse canvas) which is stretched over interior boards to provide support for wallpaper and to add an extra rigidity. This method of construction, widely used in older houses, is often referred to as "scrim and sarking", the sarking being the board.

Scrim is also an item that utilizes plies of tissue reinforced with a layer of nylon (much like fishing line or heavy duty monofilament) or cotton thread. 2-ply tissue 1-ply scrim[sentence fragment] the layer of scrim is not counted in the ply count. 2/1 would be a 2-ply scrim.

Scrim is a glass fibre (previously burlap) open-mesh tape used to cover joints in plasterboard/wall board prior to plastering. It prevents a crack appearing in the plaster finish at a later date. The roll of tape may be plain or adhesive-coated to facilitate its installation.

Scrim was handed out during World War II to tape windows, so that they should not cause hazardous shrapnel in case of bomb blasts.[1]

References

  1. ^ Molly Cutpurse: "Miriam's Family Blitz", Lilith Books, 2015, page 151.