JP3362926B2 - Molded product with reused ears of adhesive tape - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to various molded products obtained by finely pulverizing waste materials, mainly ears, which are discharged during the production of adhesive tapes, and forming and processing them, and in particular, the production of kraft adhesive tapes. This is to reuse the ears that are sometimes discharged in large quantities.

[0002]

2. Description of the Related Art Reuse of ears discharged at the time of manufacturing adhesive tapes currently produced in large quantities has been basically considered impossible due to the complexity of its composition components. Therefore, there is no report on reuse. When the adhesive tape is used for packaging, the tape is the biggest obstacle in recycling cardboard paper. Therefore,
Most of the tape's ears are incinerated and only part is used as a heat source. Even when using incineration,
Various plastics that compose adhesive tape (PE, P
(P, PS, PET, etc.) generate high heat during incineration, damage the incinerator, and cause ash content generated by incineration to generate new dust.

[0003]

The most mass-produced adhesive tape is kraft adhesive tape, and the ejected ears are enormous in quantity. Kraft adhesive tape is made of poly-laminated paper, which is made by melt-laminating polyethylene on Clupack raw paper made of pulp material, and silicone or polyurethane release agent and natural rubber or synthetic rubber are used as tackifiers, softeners, fillers, etc. Is coated with an adhesive or the like, and the adhesive tape is multi-layered on a paper core. In the past, there have been no reports on the reuse of such adhesive tapes, and the only disposal method was incineration and the residual ash content was filled up. In recent years, from the viewpoint of conservation of the global environment, it has been demanded to make effective use of resources as much as possible and reduce industrial waste as much as possible.

The present invention effectively reuses the ears of an adhesive tape, which has not been used in the past, and produces various molded articles formed by a dry method in which secondary pollution does not occur at the reprocessing stage. The purpose is to provide.

[0005]

The present invention is a molded product obtained by finely crushing the ears of an adhesive tape and compressing or heating the same at the same time as compression. If the pressure-sensitive adhesive component is an adhesive tape waste material that does not hinder the crushing process, the presence of the pressure-sensitive adhesive can exert an appropriate binder effect at the stage of compression molding. In order to obtain a harder molded product, it is possible to increase the adhesive function by heating and melting the contained polyethylene component, the pressure-sensitive adhesive and the adhesive by a special internal heating method. In the present invention, various types of molded products can be obtained by a dry method, which has not been conventionally used for recycling, but which is advantageous in terms of cost.

In order to uniformly crush the ears of the adhesive tape, it is preferable to carry out the treatment in two steps. In the first stage,
The ears of the tape are roughly crushed to a size of several centimeters with a rotary cutter, and in the second step, this is finely crushed to a size of about 3 mm with a swing type fine crusher. At this stage, most of it becomes cotton-like and can be used for molding. At this time, the content ratio of the adhesive is preferably 30% or less. In some cases, when the adhesive adheres to the blade of the crusher or the filter and makes continuous processing difficult, a necessary amount of paper-like component may be added in the step of fine pulverization to prevent this.

[0007] This product is molded only by compressing the adhesive functioning as a binder. If further strength is required, the polyethylene contained therein functions as a hot-melt adhesive and a stronger molded product can be obtained by internally heating by microwave or electromagnetic induction simultaneously with compression molding.

Further, in the case of molding by using this internal heating system together, various plastics and fillers may be added before molding depending on the characteristics of the molded product to be obtained. Examples of plastics to be added include polyethylene, polypropylene, polystyrene, and various biodegradable plastics. Examples of the filler include talc, calcium carbonate, titanium dioxide, clay, gypsum and the like. This method makes it possible to improve the compression strength, bending strength, tensile strength, flexibility, water resistance and the like of the molded body.

[0009]

EXAMPLES Examples of the present invention are shown below. The present invention is not limited to these examples. Example 1 Since the kraft pressure-sensitive adhesive tape has an ideal ratio of pressure-sensitive adhesive to paper quality, it could be pulverized to about 3 mm without additives. At this stage, most of the paper quality components became cotton-like, and as a result of molding with a compression molding machine, a molded product could be obtained without heating at all. At this time, the apparent density of the molded body changed in proportion to the pressure applied. The measurement results are shown in Table 1.

[0010]

[Table 1]

This molded product has suitable cushioning properties, shock absorbing properties, heat insulating properties, and sound absorbing properties, and has few dents due to the addition of weight, and is suitable as a flooring material or a cushioning material.

Example 2 The cotton-like finely pulverized product obtained in Example 1 was heated by irradiation with microwaves simultaneously with compression molding. The pressure at this time is 10-50
The range of kg / cm ² is desirable. Also, the internal heat generation temperature is 100
Control the amount of irradiation energy so that it becomes ~ 150 ° C,
A molded body that was stronger than that obtained in Example 1 was obtained. This is excellent in heat insulation, sound absorption, and bending strength, and is suitable for plywood such as wall materials.

Example 3 To 100 parts by weight of the cotton-like finely pulverized product obtained in Example 1, 100 parts by weight of biodegradable plastic (NOBON RO351: manufactured by Warner-Lambert) was added, heated and mixed, and extruded.
It cooled and obtained the board material. This plate material is strong, can be nailed, and has excellent biodegradability. This is suitable as a substitute for formwork plywood for construction work and construction material plywood.

Example 4 100 parts by weight of the cotton-like finely pulverized product obtained in Example 1 was mixed with 1 part of talc.
300 kg / c including 0 parts by weight and 5 parts by weight of titanium dioxide
A flowerpot was obtained by compression molding with m ² . This one has moderate biodegradability, and as a planting pot for reforestation or gardening,
It can be used as it is by burying it in the soil.

[0015]

INDUSTRIAL APPLICABILITY The molded product of the present invention can effectively utilize forest resources by utilizing waste materials and can reduce the emission of industrial waste.

Further, the obtained molded product can be widely used as a cushioning material having an appropriate shock absorbing property, and as a plywood for building materials having excellent strength and various molded products.

[Brief description of drawings]

FIG. 1 is a side view of an ear portion of a kraft pressure-sensitive adhesive tape used in the present invention.

FIG. 2 is a tape cross-sectional view of an ear portion of the kraft pressure-sensitive adhesive tape used in the present invention.

[Explanation of symbols]

1 core 2 Ears of craft adhesive tape 3 Adhesive coated part 4 adhesive 5 Clupak base paper 6 polyethylene laminate 7 Release agent

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tomoyuki Ishiguro 2-4, Kudanminami 2-chome, Chiyoda-ku, Tokyo Nichiban Co., Ltd. (56) References JP-A-5-245408 (JP, A) JP-A-5 -228935 (JP, A) JP-A 5-178529 (JP, A) Actual development 5-77230 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) B09B 3/00- 5/00 B29B 17/00-17/02 C09J 7/00-7/04

Claims (4)

(57) [Claims] 1. A molded product obtained by finely crushing the ears of an adhesive tape and compressing or heating the same at the same time as compression. 2. The molded product according to claim 1, wherein the adhesive tape is a kraft adhesive tape. 3. The molded article according to claim 1, wherein the adhesive tape is a mixture of Kraft adhesive tape and other adhesive tapes. 4. The molded product according to claim 1, wherein the heating is internally heated by a microwave or an electromagnetic induction method.