Hot pressing device for knitted fabric

Abstract

The utility model provides a hot-pressing device for knitted fabric, which comprises a hot-pressing preshrinking mechanism, the hot-pressing preshrinking mechanism comprises a shrinking mechanism, and the shrinking mechanism comprises a hot-pressing roller, a shrinking fabric belt, a cloth feeding and guiding roller, a tension adjusting roller and a cloth discharging and guiding roller. The cloth feeding and guiding roller and the cloth discharging and guiding roller are fixedly installed on the two sides of the hot-pressing roller and are close to the hot-pressing roller, the tension adjusting roller is fixedly installed on one side of the hot-pressing roller and is far away from the hot-pressing roller, and the shrinking fabric belt is annularly wound on the cloth feeding and guiding roller, the tension adjusting roller and the cloth discharging and guiding roller. Knitted fabric passes through the space between the shrinking fabric belt and the hot pressing roller and is pressed to the hot pressing roller by the shrinking fabric belt, and the diameter of the cloth feeding and guiding roller is smaller than that of the cloth discharging and guiding roller. According to the hot-pressing device for the knitted fabric, the tension of the shrinking fabric belt is adjusted through the tension adjusting roller, so that the hot-pressing preshrinking value of the knitted fabric is adjusted.

Description

Technical Field

[0001] The utility model belongs to the technical field of knitted fabric production equipment, in particular to a hot pressing device for knitted fabrics. Background Art

[0002] The quality requirements for knitted fabrics, such as volume, feel, surface, residual shrinkage, wear resistance and moisture permeability, are constantly increasing. This not only applies to pure cotton, but also includes blended fabrics of cotton with elastic fibers, polyamide, acetate, etc. Using a hot press pre-shrinking calender at the end of the finishing process before garment processing is a significant and effective means to improve fabric quality.

[0003] The pressurized heat shrinking is based on two elements driven at different speeds, between which the fabric passes and is thus mechanically compressed in the longitudinal direction. The change in speed around the shrinking fabric and the rollers on both sides of the fabric cause the coils to be pressed against each other, which means that the coil structure is compacted in the longitudinal direction.

[0004] For example, the patent document with the announcement number CN111575975B discloses a fabric hot-pressing separate calendering process, including a heating system and a rolling point system. The heating system is synchronized with the rolling point speed of the rolling point system to heat the fabric before entering the rolling point; a fabric surface temperature maintaining device is provided between the heating system and the rolling point system to ensure the maintenance of the fabric surface temperature. The above technical solution has the following shortcomings: if the tension applied to the fabric is too small, the coil may deviate or shift, which will cause longitudinal convex and concave creases; if the tension applied to the fabric is too large, the use of a steel hot-pressing pre-shrinking machine will result in a bad surface highlight phenomenon, resulting in a calendered compressed knitted fabric. Therefore, the hot-pressing pre-shrinkage value of the knitted fabric in the above technical solution cannot be adjusted. Utility Model Content

[0005] The utility model aims to solve the above technical problems and provides a heat pressing device for knitted fabrics, which can adjust the heat pressing pre-shrinkage value of the knitted fabrics.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A hot pressing device for knitted fabrics, comprising a hot pressing pre-shrinking mechanism, the hot pressing pre-shrinking mechanism comprising a shrinking mechanism, the shrinking mechanism comprising: a hot pressing roller, a shrinking fabric belt, a cloth-in-feed guide roller, a tension-adjusting roller, and a cloth-out-feed guide roller, the cloth-in-feed guide roller and the cloth-out-feed guide roller being fixedly mounted on both sides of the hot pressing roller and close to the hot pressing roller, the tension-adjusting roller being fixedly mounted on one side of the hot pressing roller and away from the hot pressing roller, the shrinking fabric belt being annularly wound around the cloth-in-feed guide roller, the tension-adjusting roller, and the cloth-out-feed guide roller, the knitted fabric passes between the shrinking fabric belt and the hot pressing roller and is pressed toward the hot pressing roller by the shrinking fabric belt, and the diameter of the cloth-in-feed guide roller is smaller than the diameter of the cloth-out-feed guide roller.

[0008] As a preferred technical solution, the hot pressing pre-shrinking mechanism includes two groups of shrinking mechanisms, and the two hot pressing rollers of the two groups of shrinking mechanisms run in opposite directions.

[0009] As a preferred technical solution, the hot pressing device for knitted fabrics also includes a cloth feeding mechanism, which includes a cloth tightening rack and a cloth storage box. The knitted fabric enters the cloth storage box after being tightened by the cloth tightening rack, and the cloth storage box includes a slide.

[0010] As a preferred technical solution, the hot pressing device for knitted fabrics further includes an expander, and the expander is arranged in front of the hot pressing pre-shrinking mechanism.

[0011] As a preferred technical solution, the hot pressing device for knitted fabrics also includes a steamer, which is arranged in front of the hot pressing pre-shrinking mechanism. The steamer includes an upper box body and a lower box body, and the knitted fabric passes between the upper box body and the lower box body.

[0012] As a preferred technical solution, the hot pressing device for knitted fabrics also includes a cooling mechanism, which includes a cooling conveyor belt, an exhaust fan and a water storage tank, the exhaust fan is arranged below the knitted fabric, and the water storage tank is arranged below the knitted fabric.

[0013] As a preferred technical solution, the hot pressing device for knitted fabrics further includes a cloth collecting mechanism, which is a cloth folding device or a cloth rolling device.

[0014] As a preferred technical solution, the cloth stacking device includes two clamping rollers and a cloth stacking plate. The cloth stacking plate is arranged below the two clamping rollers, and the cloth stacking plate is driven by a translation mechanism to translate back and forth laterally.

[0015] After adopting the above technical solution, the utility model has the following advantages:

[0016] The utility model discloses a heat pressing device for knitted fabrics, which adjusts the tension of the shrinking fabric belt by means of a tension adjusting roller, thereby adjusting the heat pressing pre-shrinkage value of the knitted fabrics; when the heat pressing device is stopped, the tension adjusting roller can also automatically release the tension of the shrinking fabric belt, thereby preventing the knitted fabrics and the shrinking fabric belts from being damaged; the heat pressing pressure of the knitted fabrics can be adjusted by adjusting the relative distance between the cloth-in guide roller and the heat pressing roller, and the relative distance between the cloth-out guide roller and the heat pressing roller; and the curvature of the knitted fabrics entering the shrinking mechanism can be adjusted by replacing cloth-in guide rollers of different diameters, thereby changing the surface gloss, hand feel, volume and heat pressing pre-shrinkage value of the knitted fabrics. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The figure is a schematic diagram of the structure of a heat pressing device for knitted fabrics. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] like Figure 1 As shown, a hot pressing device for knitted fabrics includes a cloth feeding mechanism, an expander 5, a steam box 6, a hot pressing pre-shrinking mechanism, a cooling mechanism, and a cloth collecting mechanism which are arranged in sequence.

[0020] The cloth feeding mechanism includes a cloth tightening frame 1 and a cloth storage box 2. The knitted fabric 3 enters the cloth storage box 2 after being tightened by the cloth tightening frame 1. The cloth storage box 2 includes a slide 4, and the knitted fabric 3 passing through the cloth tightening frame 1 falls onto the slide 4 due to its own gravity and enters the cloth storage box 2.

[0021] The knitted fabric 3 is expanded by passing through the expander 5. The expander 5 is a threaded expansion plate or a threaded expansion roller. The threaded expansion plate is a steel or copper plate surface, which is divided from the center and has oblique grooves (threads) engraved on the left and right. The oblique grooves are at an angle of 10° to 15° with the axis of the plate. The threaded expansion plate is fixed on the frame, and when the knitted fabric 3 slides over it, the threaded expansion plate has an expansion effect on the knitted fabric 3. The threaded expansion roller is a straight roller with a serrated axial cross-section and left-right spiral threads from the middle of the roller surface to both ends, and is generally made of hard rubber, copper or stainless steel.

[0022] The steam box 6 includes an upper box body and a lower box body, and the knitted fabric 3 is steamed between the upper box body and the lower box body. When entering the hot pressing preshrinking mechanism, the moisture content of the knitted fabric 3 will affect the shrinkage degree and dimensional stability of the knitted fabric 3. Insufficient or excessive humidity will directly affect the preshrinking effect. The steam box 6 makes the moisture content of the knitted fabric 3 at least 10%.

[0023] The hot pressing pre-shrinking mechanism comprises two groups of shrinking mechanisms, each group of shrinking mechanisms comprises: a hot pressing roller 7, a shrinking fabric belt 8, a cloth inlet guide roller 9, a tension adjustment roller 10, and a cloth outlet guide roller 11.

[0024] The inlet guide roller 9 and the outlet guide roller 11 are fixedly installed on both sides of the hot pressing roller 7 and close to the hot pressing roller 7, and the tension adjustment roller 10 is fixedly installed on one side of the hot pressing roller 7 and away from the hot pressing roller 7. The shrink fabric belt 8 is annularly wound around the inlet guide roller 9, the tension adjustment roller 10 and the outlet guide roller 11. The knitted fabric 3 passes between the shrink fabric belt 8 and the hot pressing roller 7 and is pressed toward the hot pressing roller 7 by the shrink fabric belt 8. The diameter of the inlet guide roller 9 is smaller than the diameter of the outlet guide roller 11, so that the speed of the knitted fabric 3 at the inlet end is higher than the speed of the hot pressing zone where the knitted fabric 3 contacts the hot pressing roller 7, so that the knitted fabric 3 adjusts itself with the change of the surface speed of the shrink fabric belt 8 without changing the structure or damaging the surface, so as to achieve longitudinal compression. The shrink fabric belt 8 is preferably a felt blanket with double-sided Teflon coating.

[0025] The shrink fabric belt 8 is bent into an arc shape when passing through the cloth-feeding guide roller 9. At this time, the outer surface of the shrink fabric belt with a certain thickness and elasticity is stretched due to the bending. When the cloth is fed, the surface of the shrink fabric belt 8 that the knitted fabric 3 contacts is the stretched part. When the shrink fabric belt 8 continues to move forward, it leaves the cloth-feeding guide roller 9, and its curvature changes. After entering the relatively straight hot pressing zone, the surface of the shrink fabric belt 8 returns to straightness and longitudinal shrinkage occurs. At this time, the knitted fabric 3 covered on the shrink fabric belt 8 is also retracted together, that is, the so-called longitudinal shrinkage of the knitted fabric 3 occurs. Since the shrink fabric belt 8 is coated on the hot pressing roller 7, the knitted fabric 3 is heat-set at the same time during the operation, thus completing the hot pressing pre-shrinkage process.

[0026] The two hot pressing rollers 7 of the two sets of shrinking mechanisms run in opposite directions. After the knitted fabric 3 is sorted by the two sets of shrinking mechanisms, its shrinkage rate can reach 25%-30%, and the shrinkage effect on both sides of the knitted fabric 3 is basically the same.

[0027] The cooling mechanism includes a cooling conveyor belt 12, an exhaust fan (not shown) and a water storage tank 13. The cooling conveyor belt 12 is horizontally arranged to convey the knitted fabric. The exhaust fan is arranged below the knitted fabric 3 to exhaust air from the top to the bottom of the knitted fabric 3. The water storage tank 13 is arranged below the knitted fabric 3 to collect water after the steam condenses.

[0028] The cloth collecting mechanism is a cloth folding device or a cloth rolling device. The cloth folding device includes two clamping rollers 14 and a cloth folding plate 15, and the cloth folding plate 15 is arranged below the two clamping rollers 14. The cloth folding plate 15 is driven by a translation mechanism to translate back and forth horizontally, so that the knitted fabric 3 passing through the two clamping rollers 14 is folded. The winding device includes a winding roller, and the winding roller is driven to rotate by a winding motor, so that the knitted fabric 3 is wound onto the winding roller.

[0029] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0030] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A hot pressing device for knitted fabrics, characterized in that: It includes a hot pressing pre-shrinking mechanism, which includes a shrinking mechanism. The shrinking mechanism includes: a hot pressing roller, a shrinking fabric belt, a cloth-in-feed guide roller, a tension-adjusting roller, and a cloth-out-feed guide roller. The cloth-in-feed guide roller and the cloth-out-feed guide roller are fixedly installed on both sides of the hot pressing roller and are close to the hot pressing roller. The tension-adjusting roller is fixedly installed on one side of the hot pressing roller and is away from the hot pressing roller. The shrinking fabric belt is annularly wound around the cloth-in-feed guide roller, the tension-adjusting roller, and the cloth-out-feed guide roller. The knitted fabric passes between the shrinking fabric belt and the hot pressing roller and is pressed toward the hot pressing roller by the shrinking fabric belt. The diameter of the cloth-in-feed guide roller is smaller than the diameter of the cloth-out-feed guide roller.

2. A hot pressing device for knitted fabrics according to claim 1, characterized in that: The hot pressing pre-shrinking mechanism comprises two groups of shrinking mechanisms, and the running directions of the two hot pressing rollers of the two groups of shrinking mechanisms are opposite.

3. A hot pressing device for knitted fabrics according to claim 1, characterized in that: The hot pressing device for knitted fabrics also includes a fabric feeding mechanism, which includes a fabric tightening rack and a fabric storage box. The knitted fabric enters the fabric storage box after being tightened by the fabric tightening rack, and the fabric storage box includes a slide.

4. A hot pressing device for knitted fabrics according to claim 1, characterized in that: The hot pressing device for knitted fabrics also includes an expander, which is arranged in front of the hot pressing pre-shrinking mechanism.

5. The hot pressing device for knitted fabrics according to claim 1, characterized in that: The hot pressing device for knitted fabrics also includes a steamer, which is arranged in front of the hot pressing pre-shrinking mechanism. The steamer includes an upper box and a lower box, and the knitted fabrics pass between the upper box and the lower box.

6. A hot pressing device for knitted fabrics according to claim 1, characterized in that: The hot pressing device for knitted fabrics also includes a cooling mechanism, which includes a cooling conveyor belt, an exhaust fan and a water storage tank. The exhaust fan is arranged below the knitted fabric, and the water storage tank is arranged below the knitted fabric.

7. A hot pressing device for knitted fabrics according to claim 1, characterized in that: The heat pressing device for knitted fabrics also includes a cloth collecting mechanism, which is a cloth folding device or a cloth rolling device.

8. A hot pressing device for knitted fabrics according to claim 7, characterized in that: The cloth stacking device comprises two clamping rollers and a cloth stacking plate. The cloth stacking plate is arranged below the two clamping rollers, and the cloth stacking plate is driven by a translation mechanism to translate back and forth laterally.

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