JPH0395075A - Core for winding of sheet of synthetic resin - Google Patents

Abstract

PURPOSE:To carry out winding what sort of synthetic resin sheet without causing a step trace by providing a step in approx. the same size as the thickness of the sheet to be wound, and forming the other areas on the outside circumferential surface than the step in a smooth arc of circle substantially. CONSTITUTION:At the outside circumferential surface a core 1 is provided with a step 2 approx. in the same side as the thickness of a synthetic resin sheet to be wound. The other areas of this surface than the step 2 are formed in a gradual arc of circle substantially, and thus the desired core material 1 is obtained.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a core material for winding up a synthetic resin sheet using a synthetic resin such as a floor material or a vinyl chloride resin sheet, and a synthetic resin sheet for the core material. When sheets are rolled together *Related to a resin sheet roll body. [Prior art] A disadvantage peculiar to long flooring materials is that they are distributed in the form of rolls wrapped around core materials such as paper tubes, but when made into rolls in this way, A step in the thickness of the long floor material occurs at the starting end of the shaku floor material, and step marks due to this step are periodically generated on the long floor material, and the rolled floor material is unraveled and installed on the floor. In some cases, the long flooring material is wavy due to the step marks, making it difficult to install it uniformly and smoothly.

On the other hand, in recent years, flooring materials have become more diverse and diversified. Many flooring materials with only a thick synthetic resin layer have been produced, but as the thickness of the synthetic resin layer increases, the defects caused by the step marks mentioned above become more noticeable, especially in the winter when the temperature is low. There was no way to make the uneven undulations of the wood blend into the floor surface, and there was a long-awaited solution to the unevenness in the industry. As a method to eliminate this level difference mark, ■ Wrap a synthetic resin sheet around a core material such as a paper tube. 1) As a core material, as shown in Japanese Utility Model Application Publication No. 17007/1983, the core material consists of an inner tube and an outer paper tube, and the outer periphery of the edge of the inner tube is A double paper tube is made by attaching a spacer to form a certain distance between the inner tube and the outer paper tube, and attaching an outer paper tube with a wall thickness of 0.5 to 1.5 m through the spacer. How to use it and ■ As a core material,
As seen in the above publication, a long article consisting of a main body and a foam sheet wrapped around the outer circumferential surface of the main body one or more times, the foam sheet having edges gradually thinned toward the leading edge. One method was to use a winding paper tube.

[Problem that the invention seeks to solve]

The method of (2) above, in which a band-shaped barber or a band-shaped foamed synthetic resin sheet is interposed between the winding start end of the synthetic resin sheet and the overlapped part of the rolled resin sheet, is a method of interposing a band-shaped barber or a band-shaped foamed synthetic resin sheet between the winding start end of the synthetic resin sheet and the overlapped part of the same rolled resin sheet. Due to the winding pressure when the sheet is rolled, the band-shaped paper or the band-shaped foamed synthetic resin sheet is bent and deformed to match the shape of the winding start end of the resin sheet, resulting in step marks. This could not be effectively prevented.

In addition, the method using a double paper tube described in (■) deforms the outer paper tube by the thickness of the long synthetic resin sheet due to the winding pressure when winding a long synthetic resin sheet such as a long flooring material. This is to eliminate step marks, but when heavy items such as flooring materials are rolled up, the entire outer paper tube is crushed unevenly, and this crushing causes wrinkles on the outer paper tube, leaving only step marks. However, wrinkle marks caused by these wrinkles also appeared, and favorable results could not be obtained. Furthermore, in the above-mentioned method (2) using a paper tube for winding long objects, the steps of long objects are absorbed by the foam, but when heavy objects such as flooring are wound up, the entire foam is damaged. The material was crushed and could not absorb the level difference at all, and level difference marks continued to be formed on the long synthetic resin sheet. A common drawback of these methods of using core materials is that although the synthetic resin sheet must be wound smoothly along the arc shape of the outer periphery of the core material, as shown in FIG. There is a change in the smooth arc shape at the starting end of the synthetic resin sheet, and improvement in this area (elimination of the level difference due to the thickness of the starting end of the synthetic resin sheet) is insufficient.

The present invention has been made against the background of such conventional technology, and provides a core material for winding a synthetic resin sheet that can almost completely eliminate step marks, and also provides a resin sheet winding assembly that eliminates step marks. It is something.

[Means for solving problems]

That is, the present invention provides (11) a core material having a step approximately the same size as the thickness of the synthetic resin sheet to be wound, and whose outer circumferential surface other than the step portion forms a gentle, generally arc-shaped surface;

(2) Over almost the entire width of the outer peripheral surface of the cylindrical core member, one end has approximately the same thickness as the synthetic resin sheet to be wound, and the thickness is gradually thinned toward the other end, and from one end to the other end. It is made by fixing a generally wedge-shaped member whose length is less than one circumference of a cylindrical core member, and has a step approximately the same size as the thickness of the synthetic resin sheet to be wound, except for the step portion. A core material whose outer peripheral surface forms a gentle, approximately arc-shaped surface.

(3) The core material according to claim 2, wherein the length of the substantially wedge-shaped member is R/6 to R/3 with respect to the outer circumferential length R of the cylindrical core member.

(4) The core material according to any one of claims 2 to 3, wherein the wedge-shaped member has a hardness substantially equal to or higher than the hardness of the synthetic resin sheet to be wound. (5) The hardness of the wedge-shaped member is 80 on Shore A hardness.
The core material according to claim 4, which has an angle of ˜95 degrees.

(6) The starting end of a synthetic resin sheet is joined to the step part of the core material according to any one of claims 1 to 5, and the resin sheet is wound around the core material to eliminate the step mark. Rotating body. The main points are as follows.

The core material of the present invention has a stepped portion (3) as shown in FIG.
may be formed integrally with the core material (1), or the second
As shown in the figure, the stepped portion (3) has one end approximately the same thickness as the synthetic resin sheet to be wound, and is formed into a shape that gradually becomes thinner in the direction of the other end, and has a length from one end to the other end. Alternatively, a substantially wedge-shaped member (4) having a length less than one circumference of the cylindrical core member (2) may be fixed to the cylindrical core member (2) by adhesive or other means.

The size of the step in the core material of the present invention must be approximately the same as the thickness of the resin sheet wound around the core material. If the level difference is larger or smaller than the thickness of the combined resin sheet to be wound, the level difference will be visible and the intended purpose cannot be achieved. In addition, the outer circumferential surface other than the stepped portion must form a gentle, approximately arc-shaped surface, and if this is not done, step marks may be formed on the synthetic resin sheet at the portion other than the stepped portion. This is not desirable.

When forming a stepped part with a substantially wedge-shaped member (4),
This approximately wedge-shaped member (4) is a cylindrical core member (2).
), and one end has a thickness that is approximately the same as the thickness of the resin sheet to be wound.
It must be formed in a shape that gradually becomes thinner toward the other end edge, and the length from one end to the other end must be one circumference or less around the outer circumference of the cylindrical core member. Even if the length is longer than one circumference, not only will the effect of preventing step marks not be improved, but it will also be difficult to uniformly attach the substantially wedge-shaped member to the cylindrical core member, which is not preferable. If the length from one end to the other end becomes too short, it tends to be impossible to prevent step marks, and if it becomes too long, it becomes difficult to attach uniformly to the cylindrical core member, so the circumference of the cylindrical core member When the length is R, the length from one end of the approximately wedge-shaped member to the other end is R/6 ~
Preferably, it is R/3.

The approximately wedge-shaped member may be made of any material such as paper, rubber, or synthetic resin, but synthetic resin is preferable from the viewpoint of shapeability. As the synthetic resin, any resin such as vinyl chloride resin, polyolefin resin, urethane resin, etc. can be used, but vinyl chloride resin is preferable from the viewpoint of shapeability and adhesion to the cylindrical core member. In addition, if the hardness of this approximately wedge-shaped member is too low, the approximately wedge-shaped member will be crushed by the winding pressure when winding a long synthetic resin sheet such as a long flooring material, and the step mark will become effective. On the other hand, if it is too hard, there is a tendency for step marks to be formed, so it is preferable that the hardness of the approximately wedge-shaped member be approximately the same as the hardness of the synthetic resin sheet to be wound. The Shore A hardness is preferably 80 to 95 degrees.

In order to form the material into a substantially wedge shape, extrusion molding is preferably performed using a substantially wedge-shaped die.

As shown in Fig. 3, the approximately wedge shape is an arcuate surface so that the surface fixed to the cylindrical core member and the surface in contact with the wound synthetic resin sheet follow the outer peripheral surface of the cylindrical core member. However, as shown in FIG. 4, the surface fixed to the cylindrical core member and the surface in contact with the wound synthetic resin sheet may be formed flat. In addition, as shown in Fig. 5, in order to facilitate the adhesion work to the surface of the cylindrical core member, the end opposite to the end having approximately the same thickness as the resin sheet to be wound is perpendicularly Alternatively, it may be cut obliquely to form the cut end (5). In this case, it is preferable to make the thickness of the cut end (5) as thin as possible. Furthermore, as shown in FIG. 6, an extension part (6 ) may also be provided. To attach such a substantially wedge-shaped member to the cylindrical core member, any commonly used fixing means may be used. For example, adhesive may be used to fix the member. You may attach it using double-sided adhesive tape. The fastening does not necessarily mean that the entire surface of the substantially wedge-shaped member is fastened to the cylindrical core member, but may be fixed partially. When partially attached, fix at two points: one end side that has approximately the same thickness as the resin sheet and the other end side that gradually becomes thinner. It is preferable to do so. The resin sheet to be wound around the core material of the present invention is as follows:
There are those that have a synthetic resin layer formed on a base layer of woven, knitted, or non-woven fabric, and those that consist only of a synthetic resin layer. [Example] Example 1 A cylindrical core member made of a cylindrical tube with an outer diameter of 110 au and a cylindrical core member made of vinyl chloride resin with a hardness of 80 degrees and having a thickness of 2 mm at one end and a thickness of 0.09 mm at the other end. A length 9 in which the surface that attaches to the core member and the surface that contacts the resin sheet are flat.
5) (The synthetic resin sheet thickness is 2n++a, the outer diameter of the core member is 110mm, draw a circle with a diameter of 110mm, move the center of this circle 2III in the circumferential direction,
Centered on this point with a diameter of 110 IIlm and a central angle of 906
The length from the arc of The length is 95 years old. ) was glued together with an adhesive to obtain a core material. Floor material (7) consisting only of this core material and a 2m thick vinyl chloride resin layer.
Two 25 m rolls of the same one-size-fits-all rolls were stored, one at room temperature and the other at 10°C for about a month. When this volume was later unraveled, there were almost no step marks on any of the flooring materials, and when I applied acrylic emulsion adhesive to the floor surface, there was no lifting of the flooring material at all, even when I applied it immediately after unraveling. The construction was smooth and smooth, which was desirable. Example 2 In place of the approximately wedge-shaped member used in Example 1, a hardness of 80
Made of polyvinyl chloride resin, one end has a thickness of 2 mm, the other end has a thickness of 0.09 mm, and the surface that attaches to the cylindrical core member and the surface that contacts the synthetic resin sheet are flat. Length 45M When a floor material roll was made under the same conditions as in Example 1 except that a substantially wedge-shaped member was used, uneven, wavy step marks appeared over a distance of about 5 m from the start of the roll, although they were not clear. When this area was applied to the floor using an acrylic emulsion adhesive in the same manner as in Example 1, the floor material was slightly raised, but this raised area could be corrected using a construction roller, etc., and the installation could be done smoothly. Met. Comparative Example i The same core material with an outer diameter of 110 am used in Example 1 was used as a core material, and a 25 m roll of flooring material consisting only of a vinyl chloride resin layer with a thickness of 2 m was wrapped around this core material. It was stored at room temperature for a month. When this roll was then unwound, a step mark with uneven waves extending approximately 15 m from the start of the roll was clearly visible, and this part was fixed on the floor using an acrylic emulsion adhesive in the same manner as in Example 1. As a result, the floor material was noticeably lifted up, and even if these raised areas were corrected using a construction roller, they immediately rose again, making it impossible to install the flooring smoothly. The raised parts were not adhered to the floor surface, so it was impossible to install them immediately after unraveling. It was impossible to perform smooth construction without lifting unless one or more portions were left unraveled and spread out.

Comparative Example 2 The 110 ms outer diameter giraffe used in Example 1 was used as a core material, and a flooring material made of only a 2m thick vinyl chloride resin layer was wrapped around the core material once around the starting end. A polyvinyl chloride resin foam sheet with a thickness of 2 cm and a width of 30 cm was interposed between the sheets and the same 25 m roll was stored at room temperature for about 1 month. When this rolled body was then unwound, uneven and wavy step marks were clearly seen extending approximately 10 m from the beginning of the winding, and this area was fixed on the floor using acrylic emulsion adhesive in the same manner as in Example 1. As a result, the floor material was noticeably lifted up, and even if the raised portion was corrected using a construction roller, it immediately rose again, making it impossible to install the flooring smoothly. The raised parts were not adhered to the floor surface, so it was impossible to install them immediately after unraveling. Unless one part or more of the material is left unraveled and spread out, smooth construction without any lifting could be achieved. Compared to Comparative Example 1, it had the effect of shortening the length of the floor material where step marks occur, but it cannot be said to be an effective method for preventing step marks since the step marks amounted to 40% of the same flooring material. It is. [Effects of the Invention] If the core material of the present invention is used, any synthetic resin sheet, such as a thick single-layer synthetic resin layer flooring material, can be recycled without creating step marks. can be done, and
In the case of flooring materials, etc., it can be applied immediately after unraveling, and there is no need for special measures to smooth out the step marks after unraveling, and it is widely effective in the field of winding resin sheets into rolls. It can be used.

[Brief explanation of drawings]

1 to 2 are sectional views each showing an example of the core material of the present invention, FIGS. 3 to 6 are sectional views each showing an example of a substantially wedge-shaped member, and FIG. 8 are cross-sectional views showing the wound bodies of Example 1 and Comparative Example 1, respectively.

Claims (6)

[Claims] (1) A core material having a step approximately the same size as the thickness of the synthetic resin sheet to be wound, and whose outer peripheral surface other than the step portion forms a gentle, generally arc-shaped surface. (2) Over almost the entire width of the outer peripheral surface of the cylindrical core member, one end has approximately the same thickness as the synthetic resin sheet to be wound, and the thickness is gradually thinned toward the other end, and from one end to the other end. It is made by fixing a generally wedge-shaped member whose length is less than one circumference of a cylindrical core member, and has a step approximately the same size as the thickness of the synthetic resin sheet to be wound, except for the step portion. A core material whose outer peripheral surface forms a gentle, approximately arc-shaped surface. (3) The core material according to claim 2, wherein the length of the substantially wedge-shaped member is R/6 to R/3 with respect to the outer circumferential length R of the cylindrical core member. (4) The core material according to any one of claims 2 to 3, wherein the wedge-shaped member has a hardness substantially equal to or higher than the hardness of the synthetic resin sheet to be wound. (5) The hardness of the wedge-shaped member is 80 on Shore A hardness.
The core material according to claim 4, which has an angle of ˜95 degrees. (6) Synthetic resin sheet winding that eliminates step marks by joining the starting end of a synthetic resin sheet to the stepped portion of the core material according to any one of claims 1 to 5, and winding the synthetic resin sheet around the core material. body.