JPH05330743A - Paper tube for winding yarn material - Google Patents

Abstract

PURPOSE:To provide a paper tube which can unreel a wound yarn material smoothly and whose inside diameter is changed only a little after the yarn material is wound up. CONSTITUTION:This paper tube 1 for winding yarn material, which is formed by sticking paper sheets together with an adhesive agent, is 5-12mm in thickness, provided with at least three layers of an inner layer 2, an intermediate layer 3, and an outer layer 4, and the density of the inner layer 2 and the outer layer 4 is 0.73g/cm<3> or more, and that of the intermediate layer is 0.72g/cm<3> or less. Besides, a difference between the density of the inner layer 2, the outer layer 4 and that of the intermediate layer 3 is 0.03g/cm<3> or more, and the thickness of the intermediate layer 3 occupies 50-80% of the thickness of three layers of the inner layer 2, the intermediate layer 3, and the outer layer 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper tube for winding a yarn, and more particularly to an improvement of a paper tube for winding a spun yarn.

[0002]

2. Description of the Related Art As a conventional yarn winding paper tube, a high-density paper tube in which paper is bonded with an adhesive, or a high-density layer whose inner layer has a density of 0.73 g / cm ³ or more and whose outer layer is Density 0.70
There is known a paper tube (see Japanese Patent Laid-Open No. 52-40616) formed of two low-density layers of g / cm ³ or less.

[0003]

However, in these conventional paper tubes, that is, the former high-density paper tubes, when the yarn is wound at a high speed, the paper pipe is deformed inward by contraction stress of the yarn. Therefore, it may be difficult to pull out the paper tube from the spindle of the winder.

In the latter two-layer paper tube having a high inner layer density and a low outer layer density, when the thread is wound, the shrinking stress of the thread on the paper tube causes the outer low-density layer to dent. The inner layer is prevented from deforming inward. However, in the innermost layer of the winding yarn, the portion of the winding yarn having a high overlapping density has deep dents in the outer layer of the paper core due to the yarn, and the portion of the winding yarn having a low overlapping density has shallow dents in the outer layer of the paper core. Therefore, due to the difference in the depressions, the innermost layer of the winding yarn has a entangled portion between the lower yarn and the upper yarn, which impairs the unwindability of the yarn.

The present invention solves the above-mentioned drawbacks of the conventional paper tube, and provides a paper tube having a good unwinding property of the yarn and having a small change in inner diameter after winding the yarn.

[0006]

Means for Solving the Problems The present invention which achieves the above objects includes (1) a yarn winding paper tube in which paper is adhered with an adhesive, The paper tube has a thickness of 5 to 12 mm, an inner layer, an intermediate layer,
B. having at least three outer layers; The inner layer and the outer layer have a density of 0.73 g / cm ³ or more, the intermediate layer has a density of 0.72 g / cm ³ or less, and the density difference between the inner layer and the outer layer and the intermediate layer is 0.03 g / cm ³ or more. Then, C.I. Of the three layers, the inner layer, the intermediate layer and the outer layer, the thickness ratio of the intermediate layer is 50 to 80%, and (2) the paper tube is the outer periphery of the outer layer. The gist of the yarn winding paper tube according to the above (1) is characterized in that an epithelial layer covering the outer layer is provided on the surface.

[0007]

In the paper tube of the present invention having the structure of the above (1), when the shrinkage stress of the winding yarn acts, the low-density intermediate layer is dented through the high-density outer layer, so that the inner diameter of the inner layer That is, there is little change in the inner diameter of the paper tube, and the shrinkage stress is alleviated by the depression, so that no difference in shrinkage occurs in the wound layer.

In the innermost layer of the winding yarn, even if there is a portion where the yarns have a high overlapping density or a portion where the yarns have a low overlapping density, the outer layer has a high density so that they are uniformly depressed. There is no entanglement between the upper and lower yarns in the inner layer, so
The unwinding tension does not fluctuate, and the unwinding property is not impaired. Further, since it has the outer layer, the rupture of the paper tube is also prevented.

[0009]

1 is a sectional view showing an embodiment of the paper tube of the present invention, and FIG. 2 is a sectional view showing another embodiment of the paper tube of the present invention. Paper tube, 2 is inner layer, 3
Is an intermediate layer, 4 is an outer layer, and 5 is an epithelial layer.

In the paper tube 1 shown in FIG. 1, an inner layer 2, an intermediate layer 3 and an outer layer 4 are laminated. Each of the layers 2, 3 and 4 is made of a material mainly composed of liner paper, kraft paper or the like, which is attached with an adhesive. It is formed together. In addition, an inexpensive yellow paperboard can be used for the mid layer 3.

The thickness of the paper tube 1 is 5 to 12 mm, preferably 6 to 9 mm. Below this dimension, when the fully wound paper tube is removed, the paper tube extruding plate applied to the end surface of the paper tube is When it comes off from the end of the paper tube and directly hits the end of the yarn layer, stains and collapse of the yarn layer easily occur.
The winding amount of the thread is reduced accordingly, and the cost of the paper tube becomes high.

The inner layer 2 and the outer layer 4 have a density of 0.73 g / cm.
^If the density is ³ or more, preferably 0.75 g / cm ³ or more and the density is lower than this, the yarn speed is 4000 m / min or more, and further 6
When a paper tube rotating at a speed of 000 m / min is brought into contact with the touch roll, the paper tube may burst due to the impact of the contact.
The upper limit of the density of the layers 2 and 4 is not particularly limited, but is preferably about 0.90 g / cm ³ .

The intermediate layer 3 has a density of 0.72 g / cm ³ or less,
It is preferably 0.70 g / cm ³ or less, and the density difference between the inner layer 2 and the outer layer 4 and the intermediate layer 3 is 0.03 g / cm ³ or more,
The density of the intermediate layer 3 is preferably 0.05 g / cm ³ or more, and when the density difference between the inner layer 2 and the outer layer 4 is smaller than this, the shrinkage stress of the yarn on the paper tube is sufficient. Since it cannot be absorbed, the paper tube itself may be deformed inward.

The intermediate layer may be divided into a plurality of layers with a high-density layer interposed in the layer. In this case, the thickness of the intermediate layer is the thickness excluding the high-density layer, and In calculating the thickness of the high-density layer, the thickness of the interposed high-density layer is divided into half and the divided thickness is added to the inner layer and the outer layer, respectively. The lower limit of the density of the layer 3 is not particularly limited, but is preferably about 0.50 g / cm ³ . Further, the density of each layer can be changed by selecting the density of the paper itself used.

The ratio of the thickness occupied by the intermediate layer to the inner layer, the intermediate layer and the outer layer of the paper tube is 50 to 80%. Also, paper tube 1
The ratio of the thickness occupied by each layer is not particularly limited, but the inner layer 2 is 30 to 10%, the intermediate layer 3 is 50 to 80%,
The outer layer 4 is preferably 20 to 10%. When the proportion of the intermediate layer is less than 50%, the shrinkage stress of the yarn is not sufficiently absorbed and the inner diameter is greatly deformed. Also, 80
If it exceeds%, the resistance of the high-density layer to the shrinkage stress of the yarn becomes small and the deformation of the inner layer of the paper tube becomes large.

The yarn wound around the paper tube is not particularly limited, and may be synthetic fibers, for example, undrawn yarn or drawn yarn such as polyamide or polyester. When the wound yarn is a drawn yarn, the density difference between the inner layer and outer layer of the paper tube and the intermediate layer is preferably 0.05 g / cm ³ or more.

The paper tube 6 shown in FIG. 2 is similar to the paper tube 1 shown in FIG.
It covers the epithelial layer 5. The material of the epithelial layer 5 is not particularly limited, but a colored or non-colored wrapping paper for distinguishing the paper tubes, parchment paper for preventing discoloration as an overlaid paper, adjusting surface roughness, or the like, or Liner paper can be used for thickness adjustment and substrate protection. The thickness of the epithelial layer 5 is not particularly limited, but is preferably 0.1 to 1 mm.

Examples 1 to 6 and Comparative Examples 1 to 9 Nylon 6 was melted at a temperature of 255 degrees Celsius and extruded into a thread form from a spinneret, and the extruded yarn was cooled with low temperature air, and after applying an oil agent. , Peripheral speed 5000m / min roll and peripheral speed 5
Stretching between rolls at 600 m / min, surface temperature 1
After heat-fixing with a hot roll of 80 degrees (Celsius), winding with a spindle drive type winder, birefringence 38 × 10 ⁻⁶ ,
A yarn of 70 denier and 24 filament was obtained. In this winder, the paper tube was gripped in such a manner that two rubber rings were held per paper tube in the axial direction of the spindle. As for the paper tube having a thickness of 9 mm, the density and thickness ratio of each layer were changed as shown in Table 1, and the results shown in the same table were obtained.

However, the density of each layer of the prototype paper tube was measured by the following method. A. Preparation of sample to be measured a. Cut the paper tube vertically and divide it into two parts. b. Cut one end of the paper tube with one end cut into a semi-circular shape,
Next, the scraped surface is colored with a commercially available oil-based writing instrument, and the colored surface is slightly scraped again to separate the inner layer, the intermediate layer, and the outer layer into layers according to the difference in permeation of the coloring liquid. c. The paper tube divided into layers is sandwiched between iron plates, and the paper tube having a thickness of about 1 mm is sampled from each layer by pressurizing the paper tube in a direction in which the semicircular paper tube extends linearly. d. From each of the collected paperboards, five 50 mm square samples to be measured are cut out per layer. B. Density measurement a. The thickness of each sample to be measured is measured with a micrometer at three locations in the vertical direction and at three locations in the horizontal direction to obtain an average value, and the average value is multiplied by the measured values of the vertical and horizontal lengths. Obtain the volume V. b. The weight G of the sample for which the volume is obtained is measured, and the apparent specific gravity G
/ V was determined and this was used as the density.

In the evaluation items of Table 1, the change in inner diameter means
It refers to the dimensional change of the inner diameter of the central part of the paper tube, and the difference in yarn stress is the yarn speed of 20 m / min for the yarns of the innermost layer and the intermediate layer of the wound yarn.
Indicates a difference in stretching stress when continuously cold-stretching at a stretching ratio of 1.045 times.

[0021]

[Table 1]

[0022]

As described above, the paper tube of the present invention according to claim 1 is: The paper tube has a thickness of 5 to 12 mm, an inner layer, an intermediate layer,
B. having at least three outer layers; The inner layer and the outer layer have a density of 0.73 g / cm ³ or more, the intermediate layer has a density of 0.72 g / cm ³ or less, and the density difference between the inner layer and the outer layer and the intermediate layer is 0.03 g / cm ³ or more. Then, C.I. Of the three layers of the inner layer, the intermediate layer and the outer layer, the thickness ratio of the intermediate layer is 50 to 80%, so that the unwinding property of the yarn is good and the change in the inner diameter of the paper tube after winding the yarn is small. Moreover, it has an excellent effect of not impairing the quality of the yarn, and when an inexpensive yellow board is used for the intermediate layer, it has an excellent effect of significantly reducing the cost of the paper tube. The paper tube of the present invention according to claim 2 has an epithelial layer for covering the outer peripheral surface of the paper tube according to claim 1, in addition to the effect of claim 1, the paper tube surface It has an excellent effect that the roughness can be adjusted, the outer diameter of the paper tube can be finely adjusted, and the color of the paper tube can be distinguished.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an example of a paper tube according to the present invention.

FIG. 2 is a cross-sectional view showing another example of the paper tube according to the present invention.

[Explanation of symbols]

 1, 6: Paper tube 2: Inner layer 3: Middle layer 4: Outer layer 5: Epithelial layer

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kaji Katsuji, No. 1, Kita-shi, Tatsunokuchi, Nomi-gun, Ishikawa Prefecture Toray Industries, Inc. Ishikawa Plant

Claims (2)

[Claims] 1. A yarn winding paper tube in which paper is bonded with an adhesive, the method comprising: The paper tube has a thickness of 5 to 12 mm, an inner layer, an intermediate layer,
B. having at least three outer layers; The inner layer and the outer layer have a density of 0.73 g / cm ³ or more, the intermediate layer has a density of 0.72 g / cm ³ or less, and the density difference between the inner layer and the outer layer and the intermediate layer is 0.03 g / cm ³ or more. Then, C.I. A yarn winding paper tube, wherein the thickness ratio of the intermediate layer among the three layers of the inner layer, the intermediate layer and the outer layer is 50 to 80%. 2. The yarn winding paper tube according to claim 1, wherein the paper tube is provided with an epithelial layer covering the outer layer on an outer peripheral surface of the outer layer.