## Manufacturing technology of plastic woven bag

Manufacturing technology of plastic woven bag
1、 Linear density, linear density deviation
Relative tensile strength, elongation and linear density are the measures of the mass of fiber per unit length. The linear density of polyolefin flat filament is defined as the mass of 1km long flat filament (g). The unit is: tex (Tex), referred to as "Te". The greater the linear density, the greater the width or thickness of the flat wire. The calculation method of linear density deviation is: linear density deviation (%)_ Measured linear density - standard linear density standard linear density X100%. For example, the measured linear density is 1050 (Tex), the standard linear density is 1000 (Tex), and the linear density deviation is 1050-1000. 1000 X100% = 5%. Tensile strength is an important index of flat filament. The braid requires that the flat wire can withstand a certain load without damage and fracture, which requires that the flat wire has high strength. The force on polypropylene flat wire when it is pulled apart is called the breaking strength of flat wire. The relative tensile strength is expressed by the force (n) borne by each extra flat wire when it is broken, and the unit is n / tex. During the test, it can be calculated according to the following formula: 32 phase woven bag processing Po = D, where: Po - relative strength, N / texp - force required for flat wire breaking, n d - linear density of flat wire, Tex if the linear density of a flat wire is 800tex and the force required for breaking is 3200n, the relative tensile strength of the flat wire: Po = = 3300 = 4 (n / Tex). Film coating production line www.handern.com com
The elongation of flat filament is also called elongation. The elongation of flat filament was measured at the same time as the breaking degree. It refers to the percentage of the increase of the length of the flat wire in tensile fracture compared with the original length. It can be expressed by the following formula: elongation = X100%, where: l -- the original length of the flat wire, MML -- the length when the flat wire is stretched to break, and when the elongation of MM flat wire is controlled within 10% ~ 30%, it is more suitable for the production of woven fabrics. If it is too small, the flat filament feels stiff, the filament is easy to crack, which affects the weaving process, and makes the woven fabric prone to brittle fracture when encountering impact load; If it is too large, the strength of the flat wire is low, and the braid is not straight, which is easy to deform when in use.
2、 Flat filament coating production line www.handern.com com
The width and thickness of flat filament directly affect the tightness and softness of woven fabric. Under the condition of use license, it should be as thin as possible. On the one hand, the width of flat filament should be based on the size, on the other hand, the warp and weft density of the fabric should be considered. For example, when the warp and weft density of the fabric is (10x10) / in2, the width of the wire is 2.5mm, which is more reasonable, because the total width of the 10 wires is 25mm, so the woven fabric is compact, suitable, flat and beautiful. The relationship between the width of flat wire and the drawing multiple during wire making and the width of cut wire blank 33 the following approximate formula can be used for the introduction of new plastic packaging and processing technology:
B = (B + 0.6) (0.535-0.023r), where: 6 -- flat wire width, mm (mm) Bo -- wire blank width, mm (mm) r -- Tensile multiple
For example, if it is known that the width of the cut wire blank is 6.0mm and the drawing multiple is 5.5 times, the width of the flat wire is: B = (Bo + 0.6) (0.535-0.023r) = (6 + 0.6) (0.535-0.023x5.5) ~ 2.7 (mm). The thickness of the flat wire, the drawing multiple during wire making and the thickness of the wire blank can be calculated by the following formula: D -- the thickness of the flat wire, mmdo -- the thickness of the wire blank, mm R -- the drawing multiple
For example, given that the thickness of the wire blank is 0.12mm and the drawing multiple is 5.5 times, the thickness of the flat wire is D -- 0-0.051 (mm)
The following approximate formula can be used for the relationship between the weight of woven fabric and the thickness of flat wire: M = 2 (0.9d · L · 6), in which: m -- the mass of woven fabric, Gd -- the thickness of flat wire, um L -- the length of woven fabric, M6 -- the width of woven fabric, m, for example: if the thickness of flat wire is 45um, the length of woven fabric is 0.98M, and the width is 1m (folding diameter is 0.5m), the mass of woven fabric is: M = 2 (0.9d · L · 6) = 2 (0.9x45x0.98x1) ≈ 79.4 (g) 34 film coating production line www.handern com
Another example of plastic woven bag processing is that if the mass of woven cloth is 79.4g, the length of woven cloth is 0.98M and the width is 1m, the thickness of flat wire is: according to M = 2 (0.9d · L · 6) m, d = 2 (0.9l · b) = 2 (0.9x0.98x1) = 45 (UM) 79.4
In short, when making woven cloth, the linear density, width and thickness of flat wire must be designed according to the use requirements.
3、 Weaving performance coating production line www.handern.com com
(1) Warp density: the total number of warp threads can vary with the needs of the fabric. The warp density is indicated by every or every 1m, and the line perimeter and warp density are calculated.
(2) Weaving width: the weaving width depends on the size of the inner and outer spacing ring, that is, the inner diameter of the outer spacing ring is equivalent to the diameter of the woven cylindrical cloth, and the width of the cylindrical cloth is expressed by the folding diameter.
(3) Linear density: the weaving density depends on the size of the traction roller, the traction speed and the speed of the shuttle per minute. Since there are four shuttles, four weft threads are inserted into the shuttle every revolution. The traction speed of the traction roller can be arbitrarily selected by replacing the variable speed gear.
The speed of each shuttle is usually 100 ~ 150 times / min. the speed of the shuttle can be changed by changing the pulley. Weaving speed is determined by the number of turns of shuttle per minute and weft density: weaving speed (M / min)_ Shuttle speed (density / M (piece / revolution) or: weaving speed (mm / min) = shuttle speed (R / min) x4x flat wire width (mm). For example, four shuttle circular loom produces woven cloth with weft density of 4 (piece / cm), shuttle speed is 100 times / min, and daily output is estimated by the following formula: introduction to packaging bag processing technology of new and old plastic materials
Daily output (m)= four hundred When producing polyolefin woven bags on a 100x4x60x24x85% (efficiency) = 1224 (m) circular loom, see table 1-11 for the spacer ring, variable speed gear, warp and weft width, number of warp ends and distribution number of brown frame warp threads.

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