JPS5926249A - Tearing film - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a synthetic Jk H film that has high tensile strength and can be torn in a fixed direction.

Generally, synthetic resin films have poor tearability due to their malleable ductility, and in many cases, when an attempt is made to tear the film, the film stretches to a certain extent and then breaks. Furthermore, even if the film has some good tearability, when the film is pulled, the part along the tear line stretches or plastically deforms, making the tear line messy, and furthermore, the direction of the tear line is inconsistent. It is. One way to make the film easier to tear is to stretch it in the -axial direction. That is, when a film is stretched, the molecules constituting the film fc are oriented in the stretching direction, so the film becomes easy to tear along a line parallel to the stretching direction, and the elongation rate of a sufficiently stretched film is significantly reduced. Therefore, the apparent tensile strength in that direction increases, but on the other hand,
The tensile strength in the direction 1α or more is significantly reduced.

In view of the above-mentioned points, the present invention provides a synthetic resin film which has high tensile strength and can be torn in a certain direction, for example, in the form of a cotton line. The point of J'a is that -ill+stretched filtration and C reinforced filtration are laminated.
The present invention will be explained below based on the illustrated embodiments.

In the figure, reference numeral 1 is a -+++b stretched film, and 2 is a reinforcing film, both of which are lamicted to form a single 7-1 Luno Tona. - The axially stretched film 1 is stretched in the direction of the arrow n, with molecules oriented in the direction of the arrow a, the elongation rate in the n direction is small, the tensile strength is large, and Tensile strength in the important b-direction 1 to 5 A small tear crevice is formed along a line parallel to the direction of the arrow. The reinforcing film 2 has an appropriate tensile strength in the 1) direction, and has -axis stretching 7 (Luno,
This is to compensate for the low tensile strength in the 1) direction. In addition, the properties of the reinforcing film 2 in the n direction are not particularly limited, but at least in the b direction, it is required that the elongation rate is not extremely large and that it is tearable. .

When the thus formed 2-laminated film is torn in the direction of arrow 1 as shown in FIG.
tends to tear along line c parallel to the stretching direction.

On the other hand, the reinforcing film 2 tends to tear in any direction.

Now, when the reinforcing film 2 is tossed to be torn along the line d, since the film 2 is laminated to the uniaxially stretched film 1, the uniaxially stretched film 1 must also be torn in order to be torn along the line d. It must be torn along line d at the same time.

However, since the axially stretched film 1 has great directionality and strong tensile strength in the stretching direction, it cannot be torn in the direction of the line d, so the reinforcing film 2 will also be torn along the line C. The film 1 is laminated with υ, and the film] is the most difficult to stretch in the direction of the arrow e, so in the end, the reinforcing film 2 is torn with almost no elongation.〇By the way, the reinforcing film 2 It is not necessarily limited to things with a small directionality, but things with an extremely large directionality,
For example, one method is to use a -axially stretched film. Of course, in this case, it is not necessary to laminate the uniaxially stretched film 2, which is the reinforcing film, with the stretching direction perpendicular to the uniaxially stretched film.

An example of using FttE tearable film as a lid for a pull-up container is shown below. Here, a pull-up container is a container that is airtight with the outside of the bottle or can, and the lid is tightly attached to the container, so that when taking out the contents, it is not necessary to remove the container, but rather to attach it to the cup in advance. This is a type of device in which an appropriate hole is made in the bottom by pulling it up, and it is impossible to hold the hole once it has been drilled.

In the figure, numeral 3 is a container, and 4 is a lid. Lid 4 has a thickness of 50μ
A tearable film laminated with an axially stretched nylon film having a thickness of 50 μm and a nylon axially stretched film having a thickness of 50 μm is punched and formed to fit the shape of the container 3. Extended 1111 line 5 passing through the center of the dimension
A grip 5 is integrally formed at the intersection of the rim and the periphery.

Here, M4 is attached to the container 3 by adhesive, but the adhesive force is greater than the tear strength of the lid 4 when the grip 5 is pulled up, and moreover, when the grip is pulled up with an appropriate force, the attachment part of the grip is It is important that the lid 4 be such that it can be peeled off from the container 3.

As detailed above, the present invention is a film obtained by laminating a uniaxially stretched film and a tearable film, and the film retains the tearability of the uniaxially stretched film and has high tensile strength in any direction. It is something.

[Brief explanation of the drawing]

Figure 1 is a perspective view showing the tearable film of the present invention;
The figure is a plan view showing a torn state, and FIG. 3 is a perspective view showing an embodiment of the tube.

Claims (1)

[Scope of Claims] / A 111Ql+ 415 stretched film l that can be torn along a direction parallel to the stretching direction, and - at least as appropriate in the direction directly perpendicular to the stretching direction of the above-mentioned -'Pill lnl stretched film. A tearable material (U) is formed by laminating a reinforcing film 2 having a tensile strength IK. , 2 The reinforcing film 2 is a stretched film whose stretching direction is directly parallel to the stretching direction of the stretched film 1. Tearable film as described. 3-: l'llll stretched film 1 and reinforcing film
2 is a nylon 414-axially stretched film.
The tearable film specified in Item 111 of Box 2 of W Requested.