CN111138759A

CN111138759A - Hard wire sling and production process thereof

Info

Publication number: CN111138759A
Application number: CN202010029336.6A
Authority: CN
Inventors: 韩则国
Original assignee: Hebei Hesheng Plastic Products Co Ltd
Current assignee: Hebei Hesheng Plastic Products Co Ltd
Priority date: 2020-01-13
Filing date: 2020-01-13
Publication date: 2020-05-12

Abstract

The invention relates to the technical field of novel functional polymer materials, in particular to a hard-wire sling and a production process thereof, wherein the hard-wire sling can improve the tensile strength of the sling, reduce the elongation and improve the anti-aging capability of the sling, thereby saving energy and improving the service life and market application rate of the sling; the production process can improve the defects of the prior art and improve the production efficiency; the production process of the hard wire sling comprises the following steps: s1, mixing the materials; s2, extruding and drawing wires; s3, cooling treatment: the material extruded by the extruder enters a cooling box for cooling treatment; s4, heating and softening: guiding the cooled material into a hot water tank by adopting a first traction device, and heating and softening the material; s5, heating and shaping: guiding the heated and softened material into a hot air box by adopting a second traction device for heating and shaping; s6, shaping and embossing; and S7, winding the yarn into a coil.

Description

Hard wire sling and production process thereof

Technical Field

The invention relates to the technical field of novel functional polymer materials, in particular to a hard wire sling and a production process thereof.

Background

The weaving sling is a part applied to a lifting part of a flexible freight bag, is a key part of the flexible freight bag, bears the carrying quality of a flexible freight bag body, and has higher safety factor, the existing weaving sling is generally a soft wire sling when in use, a flat wire used in the weaving sling is formed by mixing polypropylene and master batch according to the proportion of 3:2, the mixture is melted at high temperature, drawn into a wire by a wire drawing machine, cooled, then drawn by a drawing device, heated and softened by an oil plate, and finally shaped and embossed by an embossing device into a flat soft wire.

Disclosure of Invention

In order to solve the above technical problems, an object of the present invention is to provide a hard wire sling that can improve the tensile strength of the sling, reduce the elongation, and improve the anti-aging capability thereof, thereby saving energy, and improving the service life and market application rate of the sling;

another object of the present invention is to provide a process for manufacturing a hard-wire sling, which can improve the defects of the prior art and improve the production efficiency.

The invention relates to a hard wire sling which is composed of polypropylene, polyethylene, master batch and an anti-ultraviolet agent.

Further, the hard wire sling comprises the following raw materials in the following adding proportion:

furthermore, the mesh number of the master batch is more than or equal to 1200 meshes, and calcium carbonate contained in the master batch is in a nanometer level.

Further, the ultraviolet resistant agent is a special ultraviolet resistant agent 770 uv.

The invention relates to a production process of a hard wire sling, which comprises the following steps:

s1, mixing materials: adding polypropylene, polyethylene, master batch and anti-ultraviolet agent into a mixer, heating, and mixing and plasticizing;

s2, extrusion and wire drawing: extruding the plasticized material by using an 8-shaped die head of an extruder of a special hard wire drawing unit;

s3, cooling treatment: the material extruded by the extruder enters a cooling box for cooling treatment;

s4, heating and softening: guiding the cooled material into a hot water tank by adopting a first traction device, and heating and softening the material;

s5, heating and shaping: guiding the heated and softened material into a hot air box by adopting a second traction device for heating and shaping;

s6, shaping and embossing: a third traction device, namely a shaping device, is adopted to carry out shaping and embossing treatment on the heated and shaped material to obtain a hard wire sling;

s7, winding the yarn into a coil: and winding the shaped hard wire sling into a coil through a winding machine.

Further, the heating and softening temperature in the S4 is 96-100 ℃.

Further, the temperature for heating and setting in the S5 is 120-130 ℃.

Compared with the prior art, the invention has the beneficial effects that:

1. compared with the original soft wire sling, the hard wire sling disclosed by the invention has the advantages that as the polyethylene is added into the raw materials, the polyethylene has an anti-aging effect, and under the irradiation test of an ultraviolet irradiation instrument for 144h, the hard wire is reduced by 69.5%, the soft wire is reduced by 76% under the same condition, so that the anti-aging capability of the hard wire is better than that of the soft wire;

2. the tensile strength of the hard silk and the soft silk is detected, the tensile strength of the hard silk monofilament can reach 6.7g/D, and the tensile strength of the common soft silk monofilament is 5.3 g/D;

3. the sling is not calculated on the flexible freight bag by weight, but is calculated by the tensile strength according to the formula, wherein [ (6.7-5.3)/5.3] x 100% is 26.4%, the tensile strength of the hard wire is 26.4% higher than that of the soft wire, and the sling can save about 25% of raw materials by using the hard wire every year by calculating according to 25%, so that the raw materials can be effectively saved by using the hard wire, and the cost is reduced;

4. the power consumption of each ton of produced soft wire hanging strip is about 780 KW-1028 KW, and the power consumption of each ton of produced hard wire hanging strip is about 750 KW-1000 KW, so that the power consumption of the hard wire hanging strip is reduced in the production process.

In conclusion, the hard wire sling can improve the tensile strength of the sling, reduce the elongation and improve the anti-aging capability of the sling, thereby saving energy and improving the service life and market application rate of the sling.

When the hard wire sling is used for transferring goods, 1900-2150 kg of goods can be pulled by 40g of the hard wire sling, 1750-1900 kg of goods can be pulled by 50g of the soft wire sling when the common soft wire sling is used for transferring the goods, the gram weight can be reduced by 10g/m when the hard wire sling is used under the condition that the tension is not changed compared with that when the soft wire sling is used, the tension is improved, and the manufacturing cost is effectively reduced.

Detailed Description

The following examples are given to further illustrate the embodiments of the present invention. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.

Example 1

The invention relates to a hard wire sling which is composed of polypropylene, polyethylene, a master batch and an anti-ultraviolet agent, wherein the addition ratio of the raw materials is as follows:

wherein the mesh number of the master batch is more than or equal to 1200 meshes, and the calcium carbonate contained in the master batch is in a nanometer grade.

s4, heating and softening: introducing the cooled material into a hot water tank by using a first traction device, and heating and softening at 96 ℃;

s5, heating and shaping: guiding the heated and softened material into a hot air box by using a second traction device for heating and shaping, wherein the heating and shaping temperature is 120 ℃;

In the process of preparing the hard-wire sling, a stable traction device and a large-torque specially-designed winding device are required, and through years of tests, five rubber rollers are adopted for stretching, gear transmission is selected to be more stable than chain transmission and more accurate than belt transmission, so that approximately-fiberized monofilaments can be pulled out, and the abrasion to sewing threads is reduced.

Example 2

s4, heating and softening: guiding the cooled material into a hot water tank by using a first traction device, and heating and softening the material at the temperature of 98 ℃;

s5, heating and shaping: guiding the heated and softened material into a hot air box by using a second traction device for heating and shaping, wherein the heating and shaping temperature is 123 ℃;

Example 3

s4, heating and softening: guiding the cooled material into a hot water tank by using a first traction device, and heating and softening the material at the temperature of 97 ℃;

s5, heating and shaping: guiding the heated and softened material into a hot air box by using a second traction device for heating and shaping, wherein the heating and shaping temperature is 130 ℃;

Example 4

s4, heating and softening: guiding the cooled material into a hot water tank by using a first traction device, and heating and softening the material at the temperature of 100 ℃;

s5, heating and shaping: guiding the heated and softened material into a hot air box by using a second traction device for heating and shaping, wherein the heating and shaping temperature is 128 ℃;

Example 5

s4, heating and softening: guiding the cooled material into a hot water tank by using a first traction device, and heating and softening the material at the temperature of 99 ℃;

s5, heating and shaping: guiding the heated and softened material into a hot air box by using a second traction device for heating and shaping, wherein the heating and shaping temperature is 125 ℃;

Comparative example

Mixing polypropylene and master batch according to the proportion of 3:2, melting at high temperature, drawing into filaments by a wire drawing machine, cooling, drawing by a drawing device, heating and softening an oil plate, shaping by a shaping and embossing device, and embossing into flat soft filaments to obtain the soft filament sling.

The hard wire slings prepared in examples 1-5 were tested against the soft wire slings prepared in comparative examples as follows to compare their performance:

(1) functional comparison test:

under the same conditions, the hard wire sling and the soft wire sling were subjected to an irradiation test for 144h under an ultraviolet irradiation instrument, and the following results were obtained:

example 1	The reduction is 69.8 percent
		Example 2	The reduction is 69.9 percent
Example 3	The reduction is 69.5 percent
		Example 4	The reduction is 70.1 percent
Example 5	The reduction is 69.6 percent
		Comparative example	The reduction is 76 percent

From this, it can be seen that the aging resistance of the hard yarn is superior to that of the soft yarn;

(2) tensile strength test

The tensile strength of the hard filaments and the soft filaments is detected, and the following results are obtained:

example 1	6.6g/D
		Example 2	6.7g/D
Example 3	6.7g/D
		Example 4	6.6g/D
Example 5	6.7g/D
		Comparative example	5.3g/D

From this, it can be seen that the monofilament tensile strength of the hard yarn is higher than that of the soft yarn monofilament, and calculated according to the formula [ (6.7-5.3)/5.3] × 100%: 26.4%, [ (6.6-5.3)/5.3] × 100%: 24.5%, and the tensile strength of the hard yarn is 24.5% to 26.4% higher than that of the soft yarn;

and the manufacturing costs of the hard wire slings prepared in examples 1-5 were compared to the soft wire slings prepared in comparative examples:

according to the common knowledge, the braces on the flexible freight bag are not calculated by weight, but calculated by tensile strength, calculated by 3500 tons of flexible freight bag output per year, the braces account for about 30 percent of the weight of the flexible freight bag, the weight is about 1050 tons, the weft in the braces is about 7 to 10 percent, calculated by 1050 tons of total weight of the braces, because the braces bear force mainly on the warp yarns, the weight of the normally used soft wire braces is 945 tons, because the tensile strength of the hard wires is 24.5 to 26.4 percent greater than that of the soft wires, and calculated by 25 percent, the use of the hard wire braces can save raw materials by 945 multiplied by 25 percent and approximately 236 tons per year, so the use of the hard wires can effectively save raw materials and reduce the cost;

and the production energy consumption of the hard wire slings prepared in examples 1 to 5 was compared with that of the soft wire slings prepared in comparative example:

the soft wire sling produced in the comparative example consumes about 780-1028 KW per ton of power, and when the hard wire sling of examples 1-5 was prepared, about 750-1000 KW per ton of power was consumed, from which it was found that the amount of power consumption can be effectively reduced when the hard wire sling was used.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims

1. The hard wire sling is characterized by consisting of polypropylene, polyethylene, master batch and an anti-ultraviolet agent.

2. The hard wire sling according to claim 1 wherein the hard wire sling is made from the following raw materials in the following proportions:

60-70% of polypropylene;

20-25% of polyethylene;

8-12% of master batch;

1-3% of an anti-ultraviolet agent.

3. The hard wire sling according to claim 2 wherein the hard wire sling is preferably made from the following raw materials in the following proportions:

66% of polypropylene;

22% of polyethylene;

10% of master batch;

2 percent of uvioresistant agent.

4. The hard wire harness according to any one of claims 1 to 3, wherein the master batch has a mesh size of 1200 mesh or more, and calcium carbonate is contained in the master batch in a nano-scale.

5. The hard-wire sling according to any one of claims 1 to 3 wherein said anti-UV agent is a proprietary anti-UV agent 770 uv.

6. A process for manufacturing a hard-wire harness as claimed in claims 1 to 5, comprising the steps of:

7. The process for manufacturing a hard-wire sling according to claim 6, wherein the heat softening temperature in the step S4 is 96-100 ℃.

8. The process for manufacturing a hard-wire sling according to claim 6, wherein the heat setting temperature in the step S5 is 120-130 ℃.