Microcavity for monofilament heat setting

Abstract

The utility model provides a microcavity for monofilament heat setting, and relates to the field of monofilaments. The microcavity comprises an upper cavity and a lower cavity; a monofilament inlet is formed in the top of the upper chamber; a monofilament outlet is formed in the bottom of the lower cavity; the upper chamber is communicated with the lower chamber; a gap is formed between the upper chamber and the lower chamber; an air inlet channel is arranged between the upper chamber and the lower chamber; the cross section of the air inlet channel is in a circular ring shape. The cross section of the air inlet channel is gradually reduced from the top to the bottom; a bottom opening of the air inlet channel is communicated with the gap; the microcavity is also provided with a plurality of air inlets; the air inlet is communicated with the air inlet channel and the outside of the microcavity; all the air inlets are arranged in a circumferential array mode with the circle center of the cross section of the air inlet channel as the center. And heating coils are uniformly distributed on the side wall of the lower cavity. The monofilament heat setting device can solve the problem that monofilament quality is uneven due to uneven heating when monofilaments are subjected to heat setting in the prior art, and enables the monofilaments to be heated evenly, thereby enabling the monofilament quality to be even.

Description

TECHNICAL FIELD

[0001] The utility model relates to monofilament field especially relates to a microcavity for monofilament heat setting. BACKGROUND

[0002] Monofilament heat setting refers to eliminating the internal stress of monofilament generated in the stretching process by using heat; the monofilament is usually heat set by heating roller in the prior art, such as the patent with the patent application number 202421205435.5, which discloses a polypropylene monofilament stretching heat setting device, comprising an oven shell, an inlet and an outlet are formed on the oven shell, and a stretching shell is arranged below the oven shell, a plurality of rotating connecting deflection rollers are arranged on the inner periphery of the oven shell, and a monofilament is arranged around the outer periphery of the deflection roller, a surrounding frame for containing water is installed at the inner bottom of the deflection roller, a heating rod is arranged at the inner lower part of the surrounding frame, a water pipe is connected to one side of the surrounding frame, and the other end of the water pipe penetrates through the oven shell and is provided with an expanded port, a plurality of heating rollers are arranged on the inner periphery of the stretching shell, and a heat insulation cavity is arranged at the center of the heating roller, a plurality of heating elements are installed in the outer side cavity of the heating roller, and an edge arc cover is installed in the outer side cavity of the heating roller; the monofilament stretching heat setting device provided by the above patent moves the monofilament by rotating the heating roller, and the heating roller heats the monofilament.

[0003] When using the monofilament stretching heat setting device provided by the above patent, the heating roller intermittently heats the monofilament, and the heating area of the heating roller is small when heating the monofilament, which easily causes uneven heating of the monofilament, and the expansion degree of different parts of the monofilament is different after thermal expansion and cold contraction, resulting in uneven quality of the monofilament. UTILITY MODEL CONTENTS

[0004] In view of the above problems, the microcavity for monofilament heat setting provided by the utility model can solve the problem of uneven monofilament quality caused by uneven heating in the prior art, achieve uniform heating of the monofilament, and be beneficial to the consistency of crystallization and orientation of the monofilament, so that the internal structure of the monofilament is more stable, the shape of the monofilament is more round, and the quality of the monofilament is uniform.

[0005] To achieve the above purpose, the utility model adopts the technical scheme of:

[0006] The microcavity for monofilament heat setting provided by the utility model is a closed cavity; the microcavity is provided with a monofilament inlet and a monofilament outlet;

[0007] The microcavity comprises an upper chamber and a lower chamber; the monofilament inlet is located at the top of the upper chamber; the monofilament outlet is located at the bottom of the lower chamber; the upper chamber and the lower chamber are connected;

[0008] A gap is arranged between the upper chamber and the lower chamber; an air inlet channel is arranged between the upper chamber and the lower chamber; the cross section of the air inlet channel is annular; the cross section of the air inlet channel gradually decreases from the top to the bottom; the bottom opening of the air inlet channel is in communication with the gap;

[0009] The microcavity is also provided with a plurality of air inlets; the air inlets are in communication with the top opening of the air inlet channel; the air inlets are in communication with the outside of the microcavity; all the air inlets are arranged in a circular peripheral array with the center of the cross section of the air inlet channel as the center;

[0010] The sidewall of the lower chamber is uniformly distributed with heating coils.

[0011] The microcavity for hot setting of monofilaments provided by the utility model, preferably, the cross section of the upper chamber is smaller than the cross section of the lower chamber.

[0012] The microcavity for hot setting of monofilaments provided by the utility model, preferably, the microcavity further comprises an annular buffer cavity; the annular buffer cavity is arranged outside the upper chamber and the lower chamber; the top opening of the air inlet channel is in communication with the bottom of the annular buffer cavity; the air inlets are in communication with the top of the annular buffer cavity.

[0013] The above technical solution has the following advantages or beneficial effects:

[0014] The microcavity for hot setting of monofilaments provided by the utility model, the microcavity comprises an upper chamber and a lower chamber, an air inlet channel is arranged between the upper chamber and the lower chamber, the bottom opening of the air inlet channel is in communication with a gap, nitrogen is introduced into the microcavity through the air inlet channel, and oxygen can be isolated by using nitrogen, so that oxidative degradation during hot setting of monofilaments is avoided;

[0015] Further, the cross section of the air inlet channel is annular, and the cross section of the air inlet channel gradually decreases from the top to the bottom, so that nitrogen can enter the lower chamber in a surrounding manner, so that the monofilament can be uniformly swept by nitrogen; the air inlet channel is inclined to the upper chamber at an acute angle, so that the air inlet channel can have a converging effect on nitrogen, and the air inlet is directed towards the lower chamber, so that nitrogen has stable flow and pressure to uniformly sweep the monofilament; the sidewall of the lower chamber is uniformly distributed with heating coils, a stable voltage source is provided for the heating coils, so that the heating coils maintain a constant temperature, the monofilament is heated at a constant temperature, the temperature of nitrogen is increased by heating of the heating coils, and uniform and uniform nitrogen sweeping can avoid local overheating or uneven cooling of the monofilament, avoid shrinkage or expansion difference caused by temperature difference, and be beneficial to consistency of crystallization and orientation of the monofilament, so as to promote the internal structure of the monofilament to be more stable, the shape of the monofilament to be more round, and the quality of the monofilament to be uniform;

[0016] Further, in order to realize the nitrogen uniform filling into the air inlet channel, avoid the uneven distribution of nitrogen in the air inlet channel, a plurality of air inlets are connected with the air inlet channel, all the air inlets are arranged in a circumferential array with the center of the cross section of the air inlet channel as the center, so that when the nitrogen is transported from the air inlets to the air inlet channel, the nitrogen in the air inlet channel is uniformly distributed, and the nitrogen has more stable flow and pressure when being sprayed into the lower chamber.

[0017] The prior art uses a heating roller to intermittently heat the monofilament, and the heating roller has a small contact area with the monofilament, so that the monofilament is easily unevenly heated, and after thermal expansion and contraction, different parts of the monofilament have different expansion degrees, resulting in uneven monofilament quality. The microcavity for monofilament heat setting provided by the utility model can uniformly and uniformly blow the heated nitrogen to the monofilament, thereby avoiding local overheating or uneven cooling of the monofilament, and making the monofilament uniform in quality. BRIEF DESCRIPTION OF DRAWINGS

[0018] The utility model and its features, shape and advantages will become more apparent by reading the detailed description of the non-limiting embodiments with reference to the following drawings. The same reference signs indicate the same parts throughout the drawings. The drawings are not necessarily drawn to scale, and the emphasis is on showing the main idea of the utility model.

[0019] Figure 1 is the cross-sectional structure schematic diagram of the microcavity for monofilament heat setting provided by the utility model embodiment 1. DETAILED DESCRIPTION

[0020] The utility model will be further described below in combination with the drawings and specific embodiments, but not as the limitation of the utility model.

[0021] Embodiment 1:

[0022] As shown in the drawings, Figure 1 The utility model embodiment 1 provides a microcavity for monofilament heat setting, and the microcavity 20 is a closed cavity; the microcavity 20 is provided with a monofilament inlet 21 and a monofilament outlet 22;

[0023] The microcavity 20 includes an upper chamber 23 and a lower chamber 24; the monofilament inlet 21 is located at the top of the upper chamber 23; the monofilament outlet 22 is located at the bottom of the lower chamber 24; the upper chamber 23 and the lower chamber 24 are communicated;

[0024] The upper chamber 23 and the lower chamber 24 are provided with a gap; the upper chamber 23 and the lower chamber 24 are provided with an air inlet channel 25; the cross section of the air inlet channel 25 is annular; the cross section of the air inlet channel 25 gradually decreases from the top to the bottom; the bottom opening of the air inlet channel 25 is communicated with the gap;

[0025] The microcavity 20 is also provided with a plurality of gas inlets 26; the gas inlets 26 are connected with the top opening of the gas inlet channel 25; the gas inlets 26 are connected with the outside of the microcavity 20; all the gas inlets 26 are arranged in a circular array with the center of the cross section of the gas inlet channel 25 as the center;

[0026] The side wall of the lower chamber 24 is uniformly distributed with heating coils.

[0027] In the preparation process of the monofilament, the melt is extruded from the screw extruder, shaped by the spinneret, cooled to form the monofilament, the monofilament is stretched by multiple stages of rollers, then heat setting treatment is performed, and finally the monofilament is wound; when the microcavity for heat setting of monofilament provided by the embodiment 1 of the utility model is used, rollers are arranged at the upper and lower ends of the microcavity 20, and the stretched monofilament passes through the microcavity 20 by roller transmission; the monofilament enters the upper chamber 23 from the monofilament inlet 21 and leaves from the monofilament outlet 22 by passing through the lower chamber 24; when the monofilament moves in the microcavity 20, nitrogen is injected into the gas inlet channel 25 from the gas inlet 26, collected by the gas inlet channel 25 and uniformly blown to the monofilament in the lower chamber 24; at the same time, a stable power supply is provided for the heating coils in the lower chamber 24, so that the lower chamber 24 maintains a constant temperature and the monofilament is heated at a constant temperature.

[0028] The microcavity for heat setting of monofilament provided by the embodiment 1 of the utility model, the microcavity 20 includes the upper chamber 23 and the lower chamber 24, the gas inlet channel 25 is arranged between the upper chamber 23 and the lower chamber 24, the bottom opening of the gas inlet channel 25 is connected with the gap, nitrogen is introduced into the microcavity 20 through the gas inlet channel 25, and nitrogen can be used to isolate oxygen to avoid oxidative degradation of the monofilament during heat setting;

[0029] Further, the cross section of the gas inlet channel 25 is in the shape of a ring, the cross section of the gas inlet channel 25 gradually decreases from the top to the bottom, so that the nitrogen can enter the lower chamber 24 in a ring shape, so that the monofilament can be uniformly blown by the nitrogen; the gas inlet channel 25 which is inclined at an acute angle with the upper chamber 23 can have a collection effect on the nitrogen, and the nitrogen is introduced towards the lower chamber 24, so that the nitrogen has a stable flow rate and pressure to uniformly blow the monofilament; the side wall of the lower chamber 24 is uniformly distributed with heating coils, a stable power supply is provided for the heating coils, so that the heating coils maintain a constant temperature and heat the monofilament at a constant temperature; the nitrogen is heated by the heating coils to increase the temperature, and the uniform and uniform nitrogen blowing can avoid local overheating or uneven cooling of the monofilament, avoid shrinkage or expansion difference caused by temperature difference, and be beneficial to the consistency of crystallization and orientation of the monofilament, so as to promote the internal structure of the monofilament to be more stable, the shape of the monofilament to be more round, and the quality of the monofilament to be uniform;

[0030] Further, in order to realize the nitrogen uniform filling into the air inlet channel 25, avoid the nitrogen uneven distribution in the air inlet channel 25, a plurality of air inlets 26 are connected with the air inlet channel 25, all the air inlets 26 are arranged in a circular array with the center of the cross section of the air inlet channel 25 as the center, so that when the nitrogen is transported from the air inlets 26 to the air inlet channel 25, the nitrogen in the air inlet channel 25 is uniformly distributed, and the nitrogen has more stable flow and pressure when being sprayed into the lower chamber 24.

[0031] The prior art uses a heating roller to intermittently heat the monofilament, and the heating roller has a small contact area when heating the monofilament, so that the monofilament is easily unevenly heated, and after thermal expansion and contraction, different parts of the monofilament have different expansion degrees, resulting in uneven monofilament quality; the microcavity for monofilament heat setting provided by the embodiment 1 of the utility model is used, the air inlet channel 25 with a circular cross section is arranged, the cross section of the air inlet channel 25 is gradually reduced from the top to the bottom, and the heated nitrogen can uniformly and uniformly blow the monofilament, so that the monofilament is not locally overheated or unevenly cooled, and the monofilament quality is uniform.

[0032] The microcavity for monofilament heat setting provided by the embodiment 1 of the utility model is preferably that the cross section of the upper chamber 23 is smaller than the cross section of the lower chamber 24, so that the nitrogen is more easily introduced into the lower chamber 24, and the nitrogen is prevented from flowing in the upper chamber 23 and the lower chamber 24.

[0033] The microcavity for monofilament heat setting provided by the embodiment 1 of the utility model is preferably that the microcavity 20 further comprises an annular buffer cavity 27; the annular buffer cavity 27 is arranged on the outer side of the upper chamber 23 and the lower chamber 24; the top opening of the air inlet channel 25 is connected with the bottom of the annular buffer cavity 27; and the air inlet 26 is connected with the top of the annular buffer cavity 27.

[0034] The nitrogen enters the annular buffer cavity 27 from the air inlet 26, the plurality of air inlets 26 can quickly and uniformly fill the annular buffer cavity 27, the annular buffer cavity 27 can store nitrogen, the entering nitrogen is buffered and stabilized in the annular buffer cavity 27 first, the influence of airflow fluctuation is reduced, the stable flow and pressure of the nitrogen during transportation are maintained, and the nitrogen is more stable during transportation to the air inlet channel 25.

[0035] In summary, the microcavity for monofilament heat setting provided by the utility model can solve the problem that the monofilament quality is uneven due to uneven heating when the monofilament is heat set in the prior art, realize uniform heating of the monofilament, and be beneficial to the consistency of crystallization and orientation of the monofilament, so that the internal structure of the monofilament is more stable, the appearance of the monofilament is more round, and the monofilament quality is uniform.

[0036] Those skilled in the art should understand that the skilled in the art can realize the changes in combination with the prior art and the above-mentioned embodiments, which are not described here. Such changes do not affect the essential content of the utility model, which are not described here.

[0037] The preferred embodiments of the utility model are described above. It should be understood that the utility model is not limited to the above specific embodiments, and the devices and structures not fully described should be understood as being implemented in the ordinary way in the art; any person skilled in the art can make many possible changes and modifications, or modify equivalent embodiments without departing from the technical scheme of the utility model, which does not affect the essential content of the utility model. Therefore, any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the utility model, which does not depart from the technical scheme of the utility model, still belongs to the protection range of the technical scheme of the utility model.

Claims

1. A microcavity for monofilament heat setting, characterized by, The micro-cavity is a closed cavity; the micro-cavity is provided with a monofilament inlet and a monofilament outlet; The micro-cavity comprises an upper chamber and a lower chamber; the monofilament inlet is located at the top of the upper chamber; the monofilament outlet is located at the bottom of the lower chamber; the upper chamber and the lower chamber are in communication; A gap is provided between the upper chamber and the lower chamber; an air inlet channel is provided between the upper chamber and the lower chamber; the cross section of the air inlet channel is in the shape of a ring; the cross section of the air inlet channel gradually decreases from the top to the bottom; the bottom opening of the air inlet channel is in communication with the gap; The micro-cavity is further provided with a plurality of air inlets; the air inlets are in communication with the top opening of the air inlet channel; the air inlets are in communication with the outside of the micro-cavity; all the air inlets are arranged in a circular array with the center of the cross section of the air inlet channel as the center; The sidewall of the lower chamber is uniformly provided with heating coils.

2. The microcavity for hot setting of monofilaments according to claim 1, characterized in that, The cross section of the upper chamber is smaller than that of the lower chamber.

3. The microcavity for hot setting of monofilaments according to claim 1, wherein, The micro-cavity further comprises an annular buffer cavity; the annular buffer cavity is arranged outside the upper chamber and the lower chamber; the top opening of the air inlet channel is in communication with the bottom of the annular buffer cavity; the air inlets are in communication with the top of the annular buffer cavity.

Images