Activa JavaScript para disfrutar de los vídeos de la Mediateca.
From tree to paper
Ajuste de pantallaEl ajuste de pantalla se aprecia al ver el vídeo en pantalla completa. Elige la presentación que más te guste:
The process of getting paper
The basic raw material for making paper is wood. To begin, pulpwood logs are
00:00:01
passed through a debarking drum in which they collide and rub together, removing
00:00:09
the bark. The bark is collected and burned as fuel in the power boilers. The
00:00:13
debarked logs are then conveyed to a chipper which reduces them to small
00:00:19
pieces. The chips are loaded into large vessels called digesters where they're
00:00:23
is steamed under pressure until the mixture is reduced to a wet, oatmeal-like pulp.
00:00:28
The cooking removes unwanted substances and frees the wood fibers
00:00:34
so they can be suspended in a ratio of 200 parts water to 1 part fiber.
00:00:37
This furnish, as it's called, is run onto a fast-moving mesh screen loop.
00:00:43
As the water is extracted, the fibers form a mat of paper.
00:00:49
The paper is pressed and passed through steam-heated drying cylinders
00:00:53
where the last of the water is removed.
00:00:57
A starch solution seals the paper surface
00:01:00
to prevent excessive ink absorption during printing.
00:01:03
Calendaring provides a smooth finish
00:01:07
by ironing the sheet between heavy, polished rollers.
00:01:09
The paper is wound onto a great spool to form a machine reel
00:01:13
and then rewound and cut into smaller rolls.
00:01:17
Some of these rolls are wrapped for shipment.
00:01:20
Others are sent for sheeting and packing.
00:01:23
- Valoración:
- 5 sobre 5 basada en 1 votos. Inicia sesión para valorar el vídeo.
- 1
- 2
- 3
- 4
- 5
- Idioma/s:
- Etiquetas:
- EducaMadrid
- Autor/es:
- SupermarketOnlineUK
- Subido por:
- Samuel E.
- Licencia:
- Reconocimiento - No comercial - Compartir igual
- Visualizaciones:
- 78
- Fecha:
- 22 de octubre de 2013 - 11:09
- Visibilidad:
- Público
- Centro:
- IES JOAQUIN ARAUJO
- Duración:
- 01′ 36″
- Relación de aspecto:
- 1.78:1
- Resolución:
- 640x360 píxeles
- Tamaño:
- 7.03 MBytes
