JPS6158589B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for finishing knitted fabrics, particularly tubular knitted fabrics.

The purpose of this is to remove tension, wrinkles, distortion, etc. from the knitted fabric being processed, as well as to stabilize the shrinkage ratio in the length and width directions, and therefore to improve the form stability of the product. It is something.

Conventionally, knitted knitted fabrics and the like are subjected to various external effects during knitting, bleaching, dyeing, dehydration, drying, and other processes, causing tension, wrinkles, distortion, etc. to occur in the fabric. Finishing is performed to remove these wrinkles and distortions.At this time, in order to remove wrinkles and distortions, it is necessary to spread the cloth in the width direction and press it to remove wrinkles and distortions and stabilize the form. is customary.

However, in this method, the effect of removing wrinkles and distortions is in a contradictory relationship with the shrinkage ratio in the width direction.Wrinkles and distortions are corrected by increasing the width ratio; however, by subsequent washing, etc. Shrinkage in the width direction becomes large, and especially when using modern household tumble dryers whose main mechanism is kneading and rotation, shrinkage not only in the width direction but also in the length direction occurs, and improvement of this problem is strongly desired. This is where I am.

The present invention eliminates such conventional drawbacks, and the method will be explained below based on the drawings illustrating the method. FIG. 1 is an overall view showing an example of an apparatus for carrying out the present invention; Its structure and operation will be explained in sequence.

Regarding (A), this is a width adjustment mechanism for knitted fabric, and the width expansion form 2 of the knitted fabric 1 is used to increase the width of the knitted fabric by 200% or more in the width direction. This width ratio is, for example, 60cm for a 30cm wide item.
This increases the width, which is significantly greater than the conventional method, and thereby completely eliminates wrinkles and distortions in the fabric, while also making it sag in the length direction. After being spread in this way, it is sent to rollers 3 for the next shrinking process.

(B) About the compressor mechanism When the knitted fabric 1 sent out from the pre-spreading process leaves the roller 3, it is rapidly contracted and relaxed and returns to its original width, where it is held between the endless belts 4 and 4' in a tension-free state. During the transfer, moist heat steam is injected by the moist heat injection nozzle 5 to perform shrinkage. In this process, the stitches are stabilized by shrinkage due to no tension. The wet heat injection nozzles 5 are provided on both sides of the endless belts 4, 4', and are used to spray the knitted fabric 1 as shown in the enlarged view of FIG.
It applies moist heat evenly to the fabric, adding moisture to the inside of the fabric.

(C) About the drying mechanism Next, the endless belt 6, which rotates at a slower speed than the endless belts 4 and 4', forms a loop in the fabric, and a comb-like pattern in a staggered arrangement that faces each other vertically forms a loop in the fabric. The hot air jetting nozzles 19 and 20 provided in the gaps between the hot air absorption ports 7 and 8 blow hot air onto the fabric to keep it almost hollow, and while giving vibrations from the hot air, the dryer is moved from the upper dryer to the lower dryer. Transfer to dryer. Comb-shaped hot air absorption ports 7 facing each other,
As shown in the enlarged view of Fig. 3, the hot air jet nozzles 19 and 20 installed in the gaps between the absorption ports are used to blow hot air alternately from top to bottom. is sprayed, and the blowing and absorption mechanism imparts vibrations due to wind pressure to the knitted fabric. This action utilizes the shrinkage characteristics of the applied moisture in the drying moisture range due to shrinking, and also adds a kneading effect to shrink the width and length, thereby reducing the length and width when washed. Prevent shrinkage.

That is, the stitch loop is made three-dimensional.

(D) About the vibration mechanism Next, the knitted fabric is further accumulated in a gutter-like shooter 10 having a large number of holes 9, and a compressed air blower 1
1 blows compressed air, and the rotation of the cam 12 gives mechanical vibration to the entire shooter.
The vibrations caused by the compressed air blowing and the vibrations caused by the rotation of the cam aim to balance the drying of the temporarily accumulated knitted fabric and to finally release the residual tension. Figure 4 shows an enlarged view of the mechanism.

Regarding the vibration mechanism, if high quality is not required in terms of product quality, it is possible to omit it and still achieve the initial purpose.

(E) Concerning the carrying out mechanism Next, the conveyor 13 carries out the carrying out from the processing tank. The conveyor speed is the same as the feeding speed of the first endless belts 4, 4'. By the above processing, the length shrinkage is maintained at the state immediately after the roller 3 is sent out due to width expansion, and only the width direction becomes narrower by 20% or more. Note that the inside of the processing tank maintains a constant temperature and humidity using a heat exchanger 14 and a fan 15.

(F) About the press mechanism The treated knitted fabric is heated by a rotating drum 16
Pressing is performed using a press device consisting of a combination of a felt band 17 and a felt band 17. At this time, using formwork 18, 150
% or less to reduce press passage resistance. In addition, if the fabric is expanded by more than 150% in such a treatment, the three-dimensional stitches will return to their original form and become flat, which is not preferable.

The above-mentioned series of conditions include excessive spreading, steaming without tension, drying with a kneading effect of hot air and vibration, and removal of abnormal tension in the fabric caused in the previous process by compressed air, mechanical vibration, and pressing. Furthermore, it is possible to process knitted fabrics without wrinkles or distortions, and without shrinkage in length or width due to washing.

In particular, this series of treatments creates the same condition as after kneading and drying in a tumbler, so there is no shrinkage as in the conventional method.

Therefore, it is not desirable for this purpose to deviate from the specified conditions.

Although the drying mechanism (C) is exemplified using two stages in parallel, it is also possible to use two or more stages in parallel depending on the purpose and necessity, or even to extend the process distance and use one stage. They may be used in series.

[Brief explanation of the drawing]

FIG. 1 is a side view showing an example of an apparatus for implementing the present invention. FIG. 2 is an explanatory diagram in which a part of the shrinking mechanism shown in FIG. 1 is enlarged, and FIG. 3 is an explanatory diagram in which a part of the drying mechanism in FIG. 1 is enlarged. FIG. 4 is an explanatory diagram in which a part of the vibration mechanism shown in FIG. 1 is enlarged. 1...Knitted fabric, 2...Extending formwork, 3...Roller, 4, 4'...Endless belt, 5...Moist heat injection nozzle, 7, 8...Hot air absorption port, 10...Perforated trough-like shooter, 11... compressed air injector,
12...Cam, 16...Rotating drum, 18...Formwork, 19, 20...Hot air injection nozzle.

Claims (1)

[Scope of Claims] 1. A knitted fabric that has been expanded by 200% or more in the width direction and width-lengthening treatment is returned to a non-tensioned state and conveyed while being subjected to a wet heat injection treatment to shrink the fabric, and then the fabric is made to have a loop. The fabric is dried by blowing hot air from opposing nozzles to keep it hollow and vibrating while forming the fabric, and then press processing is performed while expanding the fabric by 150% or less in the width direction. Finishing method for knitted fabric. 2. The knitted fabric that has been expanded by more than 200% in the width direction and subjected to width adjustment treatment is returned to a non-tensioned state and conveyed while being subjected to a moist heat injection treatment to shrink the fabric, and then a loop is formed in the fabric and the fabric is placed facing each other. The fabric is dried by blowing hot air from a nozzle to keep it hollow and vibrating. Next, the fabric is temporarily pooled and subjected to wind pressure and mechanical vibration to stabilize its shape. A finishing method for knitted fabric characterized by performing press treatment while expanding the fabric by 150% or less in the direction.