JPH08217338A - Core for adhesive tape - Google Patents

Abstract

PURPOSE: To surely hold a winding condition, to prevent natural decomposition in a natural environment from making a cause of contamination even when a core is discarded after use, and to decrease a heating value when burned, with also incineration made easily capable. CONSTITUTION: A plastic foaming material layer 2 is provided in a peripheral surface of a paper tube 1 in width corresponding to the width of an adhesive tape. This plastic foaming material layer is formed of raw decomposition plastic, to obtain a core for the adhesive tape. The plastic foaming material layer 2 can be formed in an intermediate part of a thickness of the paper tube 1, and the core for the adhesive tape is prepared by molding work by using raw decomposition plastic.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a core for an adhesive tape.

[0002]

2. Description of the Related Art Most adhesive tapes are sold in a rolled state in which a paper tube, which is a cylindrical body made of paper, is wound around a core. Since these adhesive tapes are wound around the core in a constant tension state during the production, there is internal stress strain in the wound ones, which causes the so-called bamboo shoot phenomenon. It may occur or cause deformation such as partial collapse of the winding core. In addition, depending on the type of the adhesive tape, new internal stress may be generated due to the influence of humidity, temperature, etc. during storage of the wound adhesive tape to cause deformation. Such various deformations are prevented by winding a polyethylene foam sheet around the core and absorbing and relaxing internal stress by the foam sheet.

Such a core is discarded after the adhesive tape is completely rewound, and the paper part constituting the core is decomposed in a natural environment, but a polyethylene foam sheet is used. Since it is not decomposed, it will cause environmental pollution if left unattended. In addition, when incinerating a large amount at the same time, there is a problem that high combustion heat is generated and the incinerator is damaged.

Further, depending on the type of adhesive tape, a plastic core may be used because of its good appearance, suitability for mass production, and low cost. Such plastics include propylene resin, styrene resin, acrylic resin, ABS resin, polyester resin, and glass fiber reinforced resins thereof, which are molded and manufactured. These cores are also discarded after the adhesive tape is rewound, but if left unattended in the same manner as described above, it may cause environmental pollution, and when incinerated, its high combustion heat is required. There is a problem that it damages the incinerator because of.

[0005]

Therefore, even if the core of the adhesive tape is left after being discarded, it is naturally biodegraded,
Moreover, even if incinerated, only low combustion heat is generated, and it is intended to obtain an environmentally friendly product that can be easily incinerated.

[0006]

According to the present invention, a biodegradable plastic is used as the plastic used for the winding core, and a plastic foam is formed on the outer peripheral surface of the paper tube or the middle portion of its thickness. A layer is provided such that the plastic foam is formed of biodegradable plastic. Also,
Use biodegradable plastic for the plastic used to form the core.

This biodegradable plastic is a plastic which is decomposed by the action of microorganisms, and when it is generally buried in soil, it is eventually decomposed into water, carbon dioxide and the like. These biodegradable plastics include gluco-
Microbial polyester produced by fermentative production of copolyester from propylene and propionic acid.
And polyhydroxy valerate copolymer (e.g. Biopol, manufactured by Zeneca Ltd. in England), starch and modified polyvinyl alcohol (PVA) blend polymer (e.g. (Mater-Bi), made in Novamont, Italy),
Blend polymers of starch and vegetable oils (eg Novon (Nov
on), manufactured by Warner Lambert Co., Ltd. in the United States).

An aliphatic polyester chemically synthesized from diol and an aliphatic dicarboxylic acid is 1.4-butanedio-
Polymer of ethylene glycol and succinic acid, polymer of ethylene glycol and succinic acid (for example, Bionole, Showa Highpolymer Co., Ltd.)
Manufactured), polylactic acid (for example, Lacty, manufactured by Shimadzu Corporation),
Examples include polycaprolactone (for example, Tone, manufactured by Union Carbide Co., USA) (Placcel, manufactured by Daicel Chemical Industries). These biodegradable plastics
These may be used alone or in combination of two or more as appropriate.

In the case of using the plastics as described above, particularly when forming the core by molding or the like, talc, calcium carbonate, titanium oxide, clay and other fillers, ultraviolet absorbers, antioxidants, coloring In addition to agents, various materials that do not adversely affect the environment can be used as needed to obtain various properties.

[0010]

EXAMPLE 1 The present invention will be described in more detail with reference to the following examples. Polytetramethylene succinate (a polymer of 1.4 butanediol and succinic acid), which is an aliphatic polyester obtained by chemical synthesis, is used to foam. A 1 mm thick foam sheet with a magnification of 14 is prepared. This foam sheet is wound around the surface of a paper tube 1 having an inner diameter of 3 inches and an inner thickness of 2.5 mm, and is adhered with a water-soluble adhesive to form a foam layer 2. This was cut into a width of 18 mm to obtain a core 3 of an adhesive tape. Further, as shown in FIG. 3, a paper layer 4 of a paper tube may be further provided on the foam layer 2.

(Test) The foaming sheet was tested for its cushioning action and biodegradability on a rolled adhesive tape. (Cushioning action test) Inventive product 1: The same 18 mm wide cellophane adhesive tape 5 was applied to the core of Example 1 shown in FIGS. 1 and 2 described above.
Wrapped around m. Control product 1: A product similar to the product 1 of the invention except that a conventional polyethylene foam sheet was used in the foam sheet portion. (Test content) Five of each of the present invention product 1 and the control product 1 were stored under the same condition for 2 months and examined for changes. (Results) The bamboo shoot phenomenon did not appear in the product 1 of the present invention or the control product 1, and both had a sufficient buffering effect on the wound tape.

(Biodegradability test) Inventive product 1: Only the core of the inventive product 1 used in the above-mentioned buffer action test was used. Control product 1: Only the core of the control product 1, which was also used for the buffer action test, was used. (Test content) The product 1 of the present invention and the control product 1 were buried in soil, and the states after 6 months and 1 year were compared and observed. (Result) In the product 1 of the present invention, after about 6 months, about 2 of the foamed sheet was obtained.
0% was corroded and missing. Also, one year later, about 50% was also corroded and missing. In the control product 1, no corrosion or loss was observed in the foamed sheet after 6 months and 1 year. Further, the paper tube portions of the product 1 of the present invention and the control product 1 are
In each case, about 80% remained even after one year. (Discussion) The product 1 of the present invention can reliably hold the cellophane adhesive tape in a wound state without causing the bamboo shoot phenomenon, and is also considered to be useful because it is excellent in biodegradability.

[0013]

Example 2 The same polytetramethylene succinate as in Example 1 (polymer of 1.4 butanediol and succinic acid) was added,
Using plastic pellets mixed with 15% by weight of talc and using an extruder, the inner diameter 26 shown in FIG. 4 and FIG.
A core 6 having a diameter of 32 mm, an outer diameter of 32 mm and a width of 18 mm was obtained. This was a core having a white color as a whole.

Example 3 Using plastic pellets of polylactic acid (Lacti, manufactured by Shimadzu Corporation), extrusion molding was carried out in the same manner as in Example 2 to obtain a core 6 shown in FIGS. 4 and 5. This was a core having a good transparency and an excellent appearance as a whole.

(Test) The wound adhesive tape was tested for its buffering action, biodegradability and burning state. (Cushioning action test) Inventive product 2: A pressure-sensitive adhesive tape having a core of acetate and an acrylic pressure-sensitive adhesive layer formed on one surface of the core of Example 2
An 8 mm wide film wrapped around 35 m. Inventive product 3: The same as in the above-mentioned inventive product 2 but wrapped around the core of Example 3 with an adhesive tape. Control product 2: Polystyrene was used, and the same adhesive tape was wound around the core formed in the same manner as in Examples 2 and 3. (Test content) Five of each of the present invention product 2, the present invention product 3, and the control product 2 were stored under the same condition for 2 months, and the change was examined. (Results) The bamboo shoot phenomenon did not appear in any of the present invention product 2, the present invention product 3, and the control product 2, and it was a good core.

(Biodegradability test) Inventive product 2: The core of Example 2 was used. Inventive product 3: The core of Example 3 was used. Control product 2: Polystyrene was used, and a core formed in the same manner as in Examples 2 and 3 was used. (Test content) The present invention product 2, the present invention product 3, and the control product 2 were buried in soil, and the states after 6 months and 1 year were compared and observed. (Result) In the product 2 of the present invention, considerable corrosion was observed in the surface layer portion after 6 months. After one year, holes were partially opened, and cracks and colony-adhered parts, which are considered to be the growth of microorganisms, were scattered. The product 3 of the present invention was decomposed to the extent that there was almost no trace after 6 months. In contrast product 2,
No change was observed even after 6 months or 1 year, and there was no sign that decomposition was progressing.

(Combustion test) Inventive product 2: The core of Example 2 was used. Inventive product 3: The core of Example 3 was used. Control product 2: Polystyrene was used, and a core formed in the same manner as in Examples 2 and 3 was used. (Test content) The product 2, the product 3, and the control product 2 of the present invention were placed in crucibles and burned by a burner. (Result) The product 2 of the present invention burned quickly as in the case of the paper core, and the generation of soot was slight. After burning, only talc remained as a residue. The product 3 of the present invention burned promptly as in the case of the paper core, and generated little soot. No residue was seen after burning. Control product 2 raised a large flame during combustion and generated violent soot. Soot adhered to the entire inner surface and surrounding area of the crucible after combustion. The burning time required about 2-3 times as long as that in Examples 2 and 3. (Discussion) The products of the present invention 2 and the product 3 of the present invention can surely hold the adhesive tape in a wound state, do not cause the bamboo shoot phenomenon, and have good biodegradability. You can gradually collapse into the natural world. Further, the combustion is gentler than that of the control product 2, and the heat of combustion is less generated. Furthermore, the product 3 of the present invention can be decomposed in a short period of time, and is considered to be more useful.

[0017]

As described above, according to the present invention, the adhesive tape can be surely held in the wound state, and even if the core is discarded, it is naturally decomposed in the natural environment. As it goes, it does not cause environmental pollution, and since the calorific value at the time of combustion is small, it does not adversely affect the incinerator and it can be used effectively.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view of FIG.

FIG. 3 is a front view of another example of the present invention.

FIG. 4 is a front view of still another example of the present invention.

FIG. 5 is a sectional view of FIG. 4;

[Explanation of symbols]

 1 Paper Tube 2 Foam Layer 3, 6 Adhesive Tape Core 5 Adhesive Tape

Claims (3)

[Claims] 1. A core for winding an adhesive tape, comprising a paper tube having a width corresponding to the width of the adhesive tape and an appropriate thickness, the outer peripheral surface of the paper tube. Alternatively, a core for an adhesive tape in which a plastic foam layer is provided in the middle portion of its thickness and the plastic foam layer is formed of biodegradable plastic. 2. A core for winding an adhesive tape, wherein the core is formed by plastic molding and the plastic is a biodegradable plastic. 3. The biodegradable plastic is a microorganism-derived polyester, plastic derived from starch, chemically synthesized aliphatic polyester, natural polymer, natural polymer modified product, or polyurethane containing sugar chain polyol as a component.
The core for an adhesive tape according to claim 1 or 2, which is one kind or a mixture of two or more kinds.