JPH04288218A - High strength binding band made of polypropylene resin - Google Patents

Abstract

PURPOSE:To obtain a resin-made binding band for heavy packaging with a raw material strength of 500-2,000kg which can be substituted for a hoop. CONSTITUTION:A polypropylene resin-made belt-like product with a draw ratio of 15-30-fold and a width of 10-35mm is prepd. by means of roll multi-stage draw-molding. As the physical properties thereof, it has a tensile strength of 50-65kg/mm<2>, a breaking elongation of 4-10% and a Young's modulus of 1,000-1,300kg/mm<2>.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-strength binding band made of polypropylene resin for heavy packaging that can replace strap iron.

0002

[Prior Art] Conventionally, synthetic resin binding bands for heavy packaging can replace steel bands with a material strength of 500 kg or less, and are mainly used for binding heavy packages that require even higher strength. Banded iron was used.

0003

[Problems to be Solved by the Invention] However, while band iron has high tensile strength, low elongation, and low creep property,
It is easy to rust, and there is a risk that the rust may adhere to the packaged items, damage the packaged items, or cause the items to splash when unpacked and cause injury. In addition, they are heavy and difficult to handle. For this reason, there was a demand for a high-strength synthetic resin cable tie to replace band iron, but because conventional synthetic resin cable ties have a high elongation and creep property, the material strength is 500K.
It was not possible to replace the iron band with a weight of more than g.

[0004] In view of the current situation, the present invention has been developed to improve the material strength of 50
The purpose of the present invention is to provide a high-strength binding band made of polypropylene resin for heavy packaging that can replace a band iron of 0 to 2000 kg.

[0005]

[Means for Solving the Problems] In order to solve the above problems, the high-strength cable ties made of polypropylene resin of the present invention are as follows:
It is made into a strip shape with a width of 10 to 35 mm by multi-stage stretching in the length direction with a stretching ratio of 15 to 30 times, a tensile strength of 50 to 65 kg/mm2, an elongation at break of 4 to 10%, and a Young's modulus of 1000 to 1300 kg/mm2. It has been done.

[0006]

[Example] The present invention will be explained below. The binding band of the present invention is made of polypropylene resin and has a width of 10 to 3 mm.
It is made into a 5mm strip. The polypropylene resin may be produced by appropriately blending fillers such as pigments, calcium carbonate, and talc. The above-mentioned width is set to 10 to 35 mm in order to replace the band iron and to suit the packaging machine. Note that the thickness is generally 1 to 2 mm, but is not necessarily limited to this.

Furthermore, the binding band of the present invention is formed to have high strength and low elongation by being stretched in multiple rolls in the length direction at a stretching ratio of 15 to 30 times. If the above-mentioned stretching ratio is less than 15 times, the strength will be insufficient, and if it is more than 30 times, it is difficult with the current stretching technology, so it is set at 15 to 30 times. In production, the extruded original fabric is stretched in multiple stages using heated rolls, minimizing stretch breakage of the band element, and stretched to a high magnification while being heated uniformly.
Tensile strength 50-65 kg/mm2, elongation at break 4-10%
, and a Young's modulus of 1000 to 1300 kg/mm2.

[0008] A method for producing the binding band of the present invention that provides the above-mentioned physical properties will be explained. First, polypropylene resin is melt-extruded from a mold of an extruder, and the extrudate is cooled with water and taken as a raw fabric. Subsequently, the original fabric is heated with rolls heated to 100 to 190°C, introduced between a large number of closely spaced heating rolls at different speeds, and stretched in multiple stages 15 to 30 times in the length direction. At this time, the original fabric is preheated and stretched, and is uniformly heated and stretched without any unevenness. Further, the raw fabric is stretched in multiple stages by passing between adjacent rolls, so that there is no difference in the degree of orientation between the center and both sides of the raw fabric, and the raw fabric is stretched at a high magnification and has high strength. Subsequently, after the stretched original fabric is embossed, the original fabric is introduced into a dry heating tank at 250 to 300°C for heat treatment, and after cooling, it is taken off and a binding band is obtained.

[0009] Binding band manufactured by the above manufacturing method (
Width 19mm, apparent thickness 1.2mm, stretching ratio 17x)
Polypropylene resin band (PP band) (width 22 mm, apparent thickness 1
．． 0mm), polyethylene terephthalate resin band (PET band) (width 16mm, apparent thickness 0.6mm)
) and the physical properties of the iron band (width 19 mm, thickness 0.6 mm) are as follows.

0010
Tensile strength Elongation at break Young's modulus (kg
/mm2) (%) (kg/mm2)
Cable band of the present invention 58
7.0 1150
PP band 38
18.5 750 PE
T band 49 1
2.8 930 Obi Iron
75
2.5 3400 Also, stress strain diagrams of the present invention binding band, conventional PP band, PET band, and steel band (
SS curve) is shown in FIG.

As can be seen from the above physical properties and FIG.
Compared to bands, it has superior tensile strength, elongation at break, and Young's modulus.
It has a quality closer to that of banded iron.

0012

Effects of the Invention As detailed above, the binding band of the present invention is stretched in multiple rolls in the length direction to achieve a stretching ratio of 15 to 30.
It is made into a strip with a width of 10 to 35 mm and has a tensile strength of 50 to 65 kg/mm2, an elongation at break of 4 to 10%, and a Young's modulus of 1000 to 1300 kg/mm2. Can be replaced.

Moreover, since it is made of resin and can be used as a replacement for steel bands, it solves the various problems that conventional steel bands have, such as rust, low durability, damage to packages, danger when unpacking, and poor handling workability. be able to.

[Brief explanation of the drawing]

[Figure 1] Binding band of the present invention and conventional PP band, PET
It is a stress strain diagram of a band and a band iron.

Claims (1)

[Claims] [Claim 1] A strip having a width of 10 to 35 mm, which is stretched in multiple rolls in the length direction at a stretching ratio of 15 to 30 times, and has a tensile strength of 50 to 65 kg/mm2 and an elongation at break of 4.
A high-strength binding band made of polypropylene resin with a Young's modulus of 1000 to 1300 kg/mm2.