A Professional Supplier for One-Stop Purchasing of Star Hotel Linens Supplies.
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A Professional Supplier for One-Stop Purchasing of Star Hotel Linens Supplies.
WHY DO FABRICS SHRINK?
Shrinkage is a phenomenon in which the length or width of textiles changes in a certain state after washing, dehydration,
drying and other processes. Shrinkage degree involves different kinds of fibers, fabric structure, fabric processing by different
external forces, etc., have different performance.
The shrinkage rate of synthetic fiber and mixed textiles is the smallest, followed by wool, linen, cotton, silk shrinkage is larger,
and the largest is viscose fiber, rayon cotton, artificial wool fabrics. Objectively speaking, there are many problems of shrinkage
and fading of cotton fabrics, and the key is the finishing behind. Therefore, the general home textile fabrics are pre-shrunk. It is
worth noting that the pre-shrinkage treatment does not mean that there is no shrinkage, but means that the shrinkage rate is
controlled within the national standard 3%-4%. Therefore, in the purchase of hotel linen, in addition to the quality of the fabric,
color, pattern selection, the shrinkage rate of the fabric should also be understood.
一, THE CAUSE OF FABRIC SHRINLAGE PHENOMENON
1, when the fiber is spinning, or the yarn is weaving and dyeing and finishing, the yarn fiber in the fabric is stretched or deformed
by external force, and the yarn fiber and fabric structure produce internal stress, in the static dry relaxation state, or static wet relaxation
state, or in the dynamic wet relaxation state, full relaxation state, different degrees of internal stress release, so that the yarn fiber and
fabric return to the initial state.
2, different fibers and fabrics, their shrinkage degree is different, mainly depends on the characteristics of their fibers - hydrophilic fibers
shrinkage degree is larger, such as cotton, hemp, viscose and other fibers; Hydrophobic fibers shrink less, such as synthetic fibers.
3. When the fiber is in the wet state, it is puffed under the action of the infusion, which makes the diameter of the fiber larger, such as on
the fabric, forcing the fiber curvature radius of the interweaving point of the fabric to increase, resulting in the shortening of the fabric length.
For example, cotton fibers are puffed under the action of water, the cross-sectional area is increased by 40 to 50%, the length is increased
by 1 to 2%, 6, and synthetic fibers are shrinkable to heat, such as boiling water shrinkage, generally about 5%.
4, the textile fiber under heat conditions, the shape and size of the fiber change and shrink, after cooling can not return to the initial state,
called fiber heat contraction. The percentage of length before and after thermal shrinkage is called thermal shrinkage rate, which is generally
measured by boiling water shrinkage test. In boiling water at 100℃, the percentage of fiber length shrinkage is expressed. It is also useful to
measure the percentage of shrinkage in hot air at more than 100 ° C, and it is also useful to measure the percentage of shrinkage in steam at
more than 100 ° C. Fiber performance is also different due to internal structure and heating temperature, time and other conditions, such as
processing polyester staple fiber boiling water shrinkage rate of 1%, Vinylon boiling water shrinkage rate of 5%, chlorylon hot air shrinkage rate
of 50%. There is a close relationship between fiber in textile processing and dimensional stability of fabric, which provides some basis for the
design of post-process.
二, FABRIC SHRINKAGE FACTORS
1, the raw materials of the fabric are different, and the shrinkage rate is different. In general, the hygroscopic fiber, after soaking the fiber expansion,
the diameter increases, the length decreases, and the shrinkage rate is large. If the water absorption of some viscose fibers is as high as 13%, and
the synthetic fiber fabric has poor moisture absorption, its shrinkage rate is small.
2, yarn (line) is composed of fiber by twisting yarn axis arrangement, its size change in water, in addition to the nature of the fiber, but also its structure
such as twist, tightness and so on. In general, fabric yarn thickness is different, shrinkage rate is also different. The shrinkage rate of the cloth with
thick yarn is large, and the shrinkage rate of the fabric with fine yarn is small.
3, the density of the fabric is different, the shrinkage rate is also different. If the warp and latitude densities are similar, the warp and latitude shrinkage
rates are also similar. Fabric with high warp density will have a large warp shrinkage, and conversely, fabric with greater weft density than warp
density will have a large weft shrinkage. In general, the dimensional stability of high density fabrics is better than that of low density fabrics.
4, fabric production process is different, shrinkage rate is also different. In general, the fabric in the weaving and dyeing process, the fiber should
be stretched many times, the processing time is long, the shrinkage of the fabric with larger tension is large, and the reverse is small. In order to
control the width of the cloth door, in the actual process, we generally use pre-shrinkage to solve this problem (the previous article after finishing).
5, washing care, including washing, drying, ironing, each of these three steps will affect the shrinkage of the fabric. For example, the dimensional
stability of hand washing is better than that of machine washing, and the temperature of washing will also affect its dimensional stability. In general,
the higher the temperature, the worse the stability.
Choosing an appropriate ironing temperature according to the composition of the fabric can also improve the shrinkage
of the fabric. For example, cotton and linen fabrics can improve their dimensional shrinkage by ironing at high temperatures.
But not the higher the temperature, the better for synthetic fibers, high temperature ironing not only can not improve its
shrinkage, but will damage its performance, such as hard and brittle fabrics.
SHRINKAGE RATE OF GENERAL FABRIC
"Shrinkage rate" is formally referred to as "washing size change rate ", which refers to the percentage of textile shrinkage after washing or soaking.
Shrinkage rate =(size before washing - size after washing)/ size before washing ×100%
In general
Cotton 4%-10%; Cotton silk plain cloth: shrinkage rate 3.5% warp, 3.5% weft;
Twill is 4%;
Cotton satin twill: shrinkage 4% warp, 3% weft;
Cotton plain cloth: shrinkage of 6% warp, 2.5% weft;
Cotton polyester 3.5%-- 5%;
Chemical fiber 4%-8%;
Shrinkage rate of hotel textiles
Hotel textile shrinkage rate can refer to
GB/T 8628 Preparation, marking and measurement of fabric samples and garments in tests for the determination of dimensional changes in textiles
(GB/T 8628-2001, eqvlSO3759:1994)
GB/T 8629 Domestic washing and drying procedures for textile testing (GB/T 8629-2201, EQVLSO633:2000)
GB/T 8630 Textiles - Determination of dimensional changes after washing and drying (GB/T 8630-2002, ISO 5077:1984, MOD)
There are also IWS TM31, BS 4923, EN25077/26330, JIS L1909 and so on. There is also a single line of textile standards, such as
GB/T 22864-2009 "wool", GB/T 22797-2009 "bed sheet" can be used as a reference.
The shrinkage rate of the fabric is also a condition for measuring the quality of the product. The size of the shrinkage rate directly
affects the coding, plate making, cutting, sewing and washing water in the later stage of production, and also affects the production cost and
production difficulty, which is an important standard for measuring the quality of clothing (home textiles).
In response to the shrinkage rate, the national standard for textile products has made clear provisions as early as 2004: the washing size
change rate of textile products can not exceed "2%-3%", first-class products can not exceed "2%-4% ", qualified products can not exceed" 2%-5% ".
In fact, the "shrinkage rate" has always been not up to standard, is a common problem in the textile industry, whether it is in the home textile
industry or in the clothing industry. To control the shrinkage rate of textiles, it is necessary to go through a pre-shrinkage process, and add a
pre-shrinkage process, the cost may increase by 7% to 8%, so many enterprises will eliminate this process in order to reduce expenses.
In the home textile industry and the hotel linen industry, in order to reduce costs, the size of the bedding is added to the "shrink" size, so
the size of the purchased finished products is too large.
Hanbi linen brand has strict requirements in terms of quality. These brands not only use high-quality raw materials, but also through
advanced production processes and strict quality control to ensure that the quality of each linen product is reliable, compared with ordinary linen brands,
Hanbi cloth brand in the product density, water absorption, wrinkle resistance, washable performance is more excellent, to meet the hotel guests for quality pursuit.
Hanbi fabric brand in product design, not only pay attention to the appearance and durability of the product, but also pay more attention to the
comfort of the product. Some brands use soft fabrics, scientific weaving, exquisite craftsmanship, so that the fabric products are more comfortable,
soft, personal, to provide hotel guests with quality sleep experience.
The Haupi linen brand not only provides universal linen products, but also provides customized services according to the needs of the hotel. These
brands have a professional design team and production team, according to the requirements of the hotel, design in line with the hotel style and guest
needs of linen products.
Hanbi cloth brand has strict safeguard measures in after-sales service. These brands not only provide quality pre-sales service, but also can provide
perfect after-sales service. If there are any problems during the use of the hotel, these brands can provide timely solutions to ensure the normal
operation of the hotel,
We manufacture an extensive range of Premium and Luxury Bed linen, Bath linen, towels, Bed Sheets, mattress, pillows, and Hospital Linen products that are perfectly designed for the hospitality and hospital industry.
