JPH01303277A - Core - Google Patents

Abstract

PURPOSE:To facilitate the attachment of a core to a spindle by forming this core in use for winding a plastic film or the like with a cylinder with a paper layer and a ringlike waterproof covering member being tightly attached to both ends of the cylinder and covering both these end faces. CONSTITUTION:A core consists of a cylinder 1 and a ringlike waterproof covering member 2 being tightly attached to both ends of this cylinder 1 and covering both these end faces. The cylinder 1 consists of a paper core layer 3 (paper layer), plain paper 5 covering an inner surface of this core layer 3, and an external waterproof layer 6 covering an outer surface of the core layer 3. This core layer 3 is one that makes the core have its strength and is laminated in pile, that is, it consists of plural pieces of paperboard bonded with one another by a bonding agent. The waterproof covering member 2 is ultrasonic- welded to both end faces of the cylinder 1. In this connection, this covering member 2 is one that is stamped out of band steel material.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention is applicable to plastic films or sheets, paper,
It relates to a winding core used for winding up metal foil, filament, etc. (hereinafter referred to as film, etc.).

Conventional technology Conventionally, as the above-mentioned winding core, a water-resistant closing body for closing the end face and opening of the paper tube is fixed to both ends of the core body, which has a water-resistant layer formed on the outer peripheral surface of the paper tube. is known (see Japanese Utility Model Publication No. 62-7652).

Problems to be Solved by the Invention However, when using the conventional winding core, it is necessary to tear the center part of the closure in order to attach it to the spindle, which is cumbersome. In addition, since the torn closure remains fixed to the cylinder at its peripheral edge, there is a risk that the closure will get tangled with the spindle or be rolled up together with the film when winding a film, etc. onto the core. There is a problem that the winding form adheres to the film etc.

An object of the present invention is to provide a winding core that solves the above problems.

Means for Solving the Problems The winding core according to the present invention consists of a cylindrical body having a paper layer and a ring-shaped waterproof covering member that is fixed to both ends of the cylindrical body and covers both end faces thereof.

In the above, the paper layer is for providing strength to the winding core, and is made of multiple layers of paperboard. Adjacent pieces of paperboard are glued together. It is preferable that a water-resistant layer is provided on at least one of the inner and outer sides of the paper layer.

However, the water-resistant layer does not need to be present in the innermost layer or the outermost layer, and the inside or outside thereof may be covered with paper or the like. The water-resistant layer consists of a plastic layer, a metal layer, etc.

The plastic layer consists of an adhered film, coating film, or the like. The metal layer consists of a pasted foil, a vapor deposited film, or the like. Moreover, the adhesive that adheres the innermost layer and outermost layer of paperboard in the paper layer and the adjacent paperboard may serve as a water-resistant layer.

As the water-resistant covering member, it is preferable to use one made of polystyrene, polyethylene, polyester, polyvinyl chloride, etc., or a laminated composite material mainly composed of these materials.

The water-resistant covering member is fixed to the cylindrical body by, for example, adhesion using an adhesive, welding using ultrasonic waves, high frequency waves, electric heat, or the like.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings. The same members and parts are denoted by the same reference numerals throughout the drawings, and their explanation will be omitted.

Example 1 This example is shown in FIGS. 1 and 2. In FIGS. 1 and 2, the winding core consists of a cylindrical body (1) and a ring-shaped water-resistant covering member (2) that is fixed to both ends of the cylindrical body (1) and covers both end surfaces thereof.

The cylinder (1) has a paper core layer (3) (paper layer) and a core layer (3).
An inner water-resistant layer (4) that covers the inner surface of the core layer (4), plain paper (5) that covers the inner surface of the inner water-resistant layer (4), and an outer water-resistant layer (6) that covers the outer surface of the core layer (3). The core layer (3) is for providing strength to the winding core, and consists of a plurality of paperboards (7) laminated and bonded to each other with adhesive. The water-resistant covering member (2) is ultrasonically welded to both end surfaces of the cylinder (1). The water-resistant covering member (2) is, as shown in FIG.
It is punched out from a strip material (10). Covering member (
Scraps generated from the inside of the cylinder (1) are used as water-resistant coating members (12) (13) that cover both end surfaces of the cylinder (1), which have an outer diameter smaller than the inner diameter of the cylinder (1), as shown by the chain line in Fig. 3. ) can be used to mold materials, allowing for effective use of materials.

Example 2 This example is shown in FIG. In FIG. 4, the core cylinder (21) has a tapered cylindrical shape, and the outer diameter of its small diameter portion is smaller than the inner diameter of its large diameter portion. In this winding core, the covering member (23) that covers the end face of the small diameter portion can be formed from scrap generated from inside the water-resistant covering member (22) of the large diameter portion.

Example 3 This example is shown in FIG. In FIG. 5, the ring-shaped water-resistant covering member (25) fixed to both ends of the cylinder (1) and covering both end faces thereof has a generally U-shaped concave cross section, and has a substantially U-shaped concave cross section. It is designed to cover the area from the outer surface to both ends of the outer surface. and,
Portions covering the inner and outer surfaces of the cylinder (1) are fixed to the cylinder (1). Cylindrical body (1) in covering member (25)
At least the cylindrical body (
The portion covering the outer surface of 1) is preferably flush with the outer surface of the cylinder (1). This is to prevent the winding form from adhering to the film or the like being wound around the winding core.

In this third embodiment, the cylindrical body may have a tapered cylindrical shape as in the second embodiment.

In the above three embodiments, both end surfaces of the cylinder are covered with a water-resistant coating member, and water-resistant layers are present on both the inner and outer sides of the core layer, so that moisture is absorbed from both the inner and outer surfaces of the cylinder and both end surfaces. can prevent the absorption of therefore,
The core has extremely high water resistance and can be stored for long periods in the natural environment. However, a water-resistant layer is not necessarily required.

・Effects of the Invention The winding core according to the present invention consists of a cylindrical body having a paper layer and a ring-shaped water-resistant covering member that is fixed to both ends of the cylindrical body and covers both end faces. There is no need to tear it when installing it. Moreover, since the cut ends are not wound up together with the film etc., it is possible to prevent the winding form from adhering to the film etc. In addition, if the cylinder is straight, scraps generated to form the inside of the covering member can be used to cover both end faces of the cylinder with an outer diameter smaller than the inner diameter of the cylinder. If the cylinder is in the shape of a Taber cylinder, the covering member covering the end face of the small diameter part is molded from the scrap produced to form the inside of the water-resistant covering member of the large diameter part. Therefore, it is possible to use materials effectively, and costs are reduced.

Furthermore, since both end faces of the cylinder are covered with a water-resistant covering member, it is possible to prevent moisture from being absorbed into the paper layer from the end face, where moisture is most likely to penetrate.

[Brief explanation of the drawing]

FIG. 1 and FIG. 2 show a first embodiment of the present invention.
The figure is a partial vertical sectional view, Figure 2 is an enlarged view of the main part of Figure 1, and Figure 3 is a partial longitudinal sectional view.
The figure is a plan view showing how to mold the covering member used for the winding core of Example 1, FIG. 4 is a longitudinal sectional view showing Example 2 of the present invention, and FIG. 5 is a view showing Example 3 of the present invention. This is a diagram equivalent to Figure 2. (1) (21)...Cylinder body, (2) (25)...Ring-shaped water-resistant covering member, (3)...Paper core layer (paper layer)
. Applicant for the above patent: Showa Products Co., Ltd. Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] A winding core consisting of a cylindrical body (1) (21) having a paper layer (3), and ring-shaped water-resistant covering members (2) (25) fixed to both ends of the cylindrical body and covering both end faces thereof.