Basic Thinking And Technological Process For Processing Cattle Soft Upper Leather
Abstract: Based on the production practice, the process control conditions in the wet processing of yellow cattle soft upper leather were introduced in detail.
Key words: yellow cattle hide; soft upper leather; Technology
Chinese map classification number:
TS543
Document identification code:
A
Article number:
1671-1602
(
Two thousand and nine
)
01-0003-02
One
Introduction
Yellow cattle soft upper leather is an important part of the leather market. The casual shoes and tube boots designed and made are fashionable and comfortable, and are very popular with consumers.
In the market, the requirements for cattle soft upper leather are characterized by full body, good bone, soft, elastic, extensibility and plasticity. The leather surface is smooth and meticulous, without cracks, wrinkles and loose surfaces. The leather is clean and greasy, with uniform color and bright color. The thickness is uniform and smooth.
This article will introduce the processing technology of yellow cattle soft upper leather.
Two
Basic thinking and technological process for processing cattle soft upper leather
The basic idea is to start from the word "soft" and achieve "soft but not loose".
Technological process: wet blue sorting
-
Horizontal extrusion
-
Soft throw
-
Shaving
-
Trimming
-
Weigh
-
Degreasing
-
washing
-
Retanning
-
neutralization
-
Two Retanning
-
dyeing
-
Fatliquoring
-
washing
-
Water stretch
-
vacuum drying
-
Hanging drying
-
Sprinkler regain
-
Oscillating stretch
-
toggling
-
Selection classification
-
Trimming
-
Finishing
Three
Technical points and process implementation of processing cattle soft upper leather
Three point one
Sorting of wet blue skin
Wet blue sorting is to better control the production and ensure the quality of products, and is also the basis of "looking at the skin to make leather".
Choose the same way, the quality is better, the size of the sheet is large, the grain is less damaged, the wrinkle is less, the location is small, the handle is soft, the plump is good, the grain is smooth and meticulous, the color is uniform is the shallow lake blue wet leather.
Three point two
Preparation before wet processing
After selecting wet blue leather, the horizontal expansion is carried out through a through water extruder.
Then, through the soft tumbling effect of the drum, the wrinkle of the leather surface is eliminated, and the leather is soft, and the water content of each part is uniform.
Cutting thickness control
One point one
~
1.2mm
The thickness is uniform.
Then fix useless corners and cut them into round ends.
Finally, the wet blue leather is accurately weighed as the basis of material in the later process.
Three point three
Returning humidity
Before the retanning, the wet blue leather must be fully wetted, so that the leather fibers can be restored to the naturally stretched knitting state, laying a good foundation for the infiltration and combination of the chemical materials in the subsequent process.
Technology:
Two hundred
% water (
Thirty-five
~
Forty
Temperature)
Two
Oxalic acid,
Zero point five
%
AD
Turn
60min
。
measure
PH
=
Three point five
~
Three point eight
Wash it.
Oxalic acid is added to the process to strengthen the rinsing of wet blue leather, remove the surface of the blue leather with too much chromium salt, and soften the grain and improve the handle.
AD
It is a non-ionic surfactant, which can help blue leather degrease and get wet.
Three point four
Retanning
In order to further improve the shrinkage temperature of leather, reduce the loose face, split surface and rough surface of blue leather, give leather soft handle and good fullness.
Technology:
One hundred
% water (
Thirty-five
Temperature)
One
%
AF135
Turn
10min
,
Three
%
Ter
-
GotanTSP
,
Two
%
TergotanPR
Turn
60min
,
Zero point three
% formic acid, turn
30min
Measure
PH
=
Three point eight
,
Two
%
TanicorCSD
,
Six
% chromium powder.
B
=
Thirty-three
%)
One
%
CatalixU
Turn
90min
,
One
Sodium formate, turn
30min
,
Zero point eight
% sodium bicarbonate, added in two times, each interval.
30min
。
measure
PH
=
Four point one
Stop the drum for the night and turn the next morning.
30min
Wash it.
among
AF135