TW201739597A - Method for manufacturing molded article having grain pattern, and molded article having grain pattern - Google Patents

Abstract

The present invention addresses the problem of providing a method for manufacturing a molded article having a grain pattern without performing a grain processing step. The problem can be solved by a method for manufacturing a molded article having a grain pattern, the method comprising: a melting step for preparing a melt-kneaded product containing at least a thermoplastic resin and/or a thermoplastic elastomer and glass wool; an extrusion step for extruding the melt-kneaded product from a discharge port of an extrusion die by an extrusion molding method to produce a molded article; and a cooling step for cooling the molded article extruded in the extrusion step.

Description

Method for producing a molded article having a concave-convex pattern and a molded article having a concave-convex pattern

The present invention relates to a method for producing a molded article having a concavo-convex pattern and a molded article having a concavo-convex pattern formed thereon.

A molded article obtained by extruding a material such as a thermoplastic resin or a thermoplastic elastomer in a sheet or film form is used for various purposes such as construction, civil engineering, daily necessities, and agricultural use. Further, the molded article extruded in a cylindrical body is used for a garbage bag or a tube filled with cosmetics, food, or the like. These molded articles can be produced by extruding a material such as a molten thermoplastic resin or a thermoplastic elastomer from a discharge port of an extrusion die.

However, materials such as thermoplastic resins and thermoplastic elastomers have a problem of adhesion depending on the type, and the adhesion phenomenon adheres to each other when they overlap, and cannot be easily peeled off. Therefore, a method of containing, in a material such as a thermoplastic resin or a thermoplastic elastomer, from 1% by weight to 40% by weight, selected from the group consisting of silk powder, wool powder, and chitin powder, and having an average particle diameter of 30 μm or less and containing moisture, is known. A natural organic fine powder of 10% by weight or less and containing 5 wt% or less of a heat stabilizer (refer to the patent literature) 1).

In addition, it is also known that the appearance of the film is formed by forming a concave-convex (wrinkle) pattern on the molded article, and in the case of a film-like molded article such as a garbage bag, the film is easily peeled off from each other. In the formation of the uneven pattern of the molded article, a method of extruding the extruded thermoplastic resin film by a pair of rolls having irregular rolls is known (refer to Patent Document 2).

[Previous Technical Literature]

[Patent Literature]

Patent Document 1: Japanese Patent No. 3014585.

Patent Document 2: Japanese Laid-Open Patent Publication No. Hei 5-309730.

The method of pressing by the roll with irregularities described in Patent Document 2 can be suitably used for a flat molded product extruded by a T-die method. However, in the case where a molded article is produced by the expansion method, the molded article is extruded in a cylindrical shape. Therefore, when the molded article extruded in a cylindrical shape is pressed by a roller having irregularities, there is a problem that the molded article is subsequently attached. At present, there is no known method for forming a concave-convex pattern on a molded article extruded by an expansion method.

On the other hand, in the T-die method, when the thickness of the extruded molded article is different, it is necessary to adjust the unevenness between the rolls according to the thickness. Separate. In addition, the entire roller must be replaced in the case where one of the irregularities of the uneven roller is worn or missing. In the production of a molded article having a concave-convex pattern formed by a T-die method, a simpler manufacturing method is also sought.

The present invention has been developed in order to solve the above problems, and it has been found through research results that if glass wool is added to the melt kneading for extrusion molding, it is surprisingly carried out without using a roller having irregularities. In the case of the step of extrusion (hereinafter, the step of forming the uneven pattern is described as "concavo-convex processing"), it is easy to form a concave-convex pattern on the surface of the molded article which is extrusion-molded.

In other words, an object of the present invention is to provide a method for producing a molded article in which a concavo-convex pattern is formed without performing uneven processing, and a molded article in which a concavo-convex pattern is formed.

The present invention relates to a method for producing a molded article having a concavo-convex pattern and a molded article having a concavo-convex pattern formed as described below.

(1) A method for producing a molded article having a concave-convex pattern, comprising: a melting step of preparing a melt-kneaded product, wherein the melt-kneaded product contains at least a thermoplastic resin and/or a thermoplastic elastomer and glass wool; and an extrusion step Extrusion of the melt-kneaded product from the discharge port of the extrusion die by extrusion molding to form a molded article; and a cooling step in which the foregoing extrusion step is performed The extruded molded article is cooled.

(2) The method for producing a molded article having a concavo-convex shape as described in the above (1), wherein the content of the glass wool is from 1% by weight to 20% by weight.

(3) The method for producing a molded article having a textured pattern according to the above (1) or (2), wherein the extrusion molding method is an expansion method or a T-die method, and the molded article is a film or a sheet. Or a cylindrical body.

(4) The method for producing a molded article having a concavo-convex pattern as described in the above (1) or (2), wherein the extrusion molding method is a co-extrusion method; and the molded article is in the form of a laminated multi-layer product. At least one layer of the outer layer of the multilayered product is a layer formed by extruding the melt-kneaded product, and the melt-kneaded product contains at least the thermoplastic resin and/or thermoplastic elastomer and glass wool.

(5) The method for producing a molded article having a concavo-convex shape as described in the above (3), wherein the extrusion molding method is coextrusion by an expansion method or coextrusion by a T-die method; The product is formed in the form of a multi-layered product; at least one layer of the outer layer of the multilayered product is a layer formed by extruding the melt-kneaded product, and the melt-kneaded product contains at least the thermoplastic resin and/or thermoplastic elastomer and glass. velvet.

(6) A molded article having a concave-convex pattern formed of at least a thermoplastic resin and/or a thermoplastic elastomer and glass wool.

(7) The molded article in which the uneven pattern is formed as described in the above (6), wherein the glass wool content is from 1% by weight to 20% by weight.

(8) The molded article in which the uneven pattern is formed as described in the above (6) or (7), wherein the molded article is a film, a sheet or a tubular body.

(9) The molded article in which the uneven shape is formed according to any one of the above aspects, wherein the molded article is a multilayered product; and at least one of the outer layer of the multilayered product contains at least the thermoplastic resin. And/or a layer of thermoplastic elastomer and glass wool.

(10) The molded article in which the uneven pattern is formed as described in the above (8) or (9), wherein the molded article has a thickness of from 3 μm to 300 μm.

In the present invention, only the glass wool is added to the melt-kneaded material for extrusion molding to form a concave-convex pattern on the surface of the molded article which is easily extruded. Therefore, since it is not necessary to carry out the uneven processing, the molded article in which the uneven pattern is formed can be produced by various extrusion methods including the expansion method.

Fig. 1 is a photograph in place of the figure, (A) in Fig. 1 is a photograph of glass wool, and (B) in Fig. 1 is a photograph of glass fiber.

Fig. 2 is a photograph in place of the drawing, (A) in Fig. 2 is a photograph of a bag produced in Example 1, and (B) in Fig. 2 is a photograph of a bag produced in Comparative Example 1.

Fig. 3 is a photograph replacing the drawings, and is a photograph of the bag produced in Example 2.

4 is a photograph in place of the drawing, and FIG. 4(A) is a photograph of the layer side of the two-layer film produced in Example 3 including the glass wool, and (B) in FIG. 4 is a layer containing no glass wool. Side photo.

Fig. 5 is a photograph in place of the drawing, and Fig. 5 (A) is a photograph of the side of the layer containing the glass wool of the two-layer film produced in Example 4, and (B) of Fig. 5 is a layer containing no glass wool. Side photo.

Fig. 6 is a photograph in place of the drawing, (A) in Fig. 6 is a photograph of a film produced in Example 5, and (B) in Fig. 6 is a photograph of a film produced in Comparative Example 2.

Fig. 7 is a photograph in place of the figure, (A) in Fig. 7 is a photograph of the cylindrical body produced in Example 6, and (B) in Fig. 7 is a photograph of the cylindrical body after printing, in Fig. 7 (C) is a photograph of the cylindrical body having a spiral formed to tighten the cover.

Figure 8 is a photograph in place of the figure, (A) in Figure 8 is an X-ray transmission image of the film produced in Example 1, and (B) in Figure 8 is an X-ray transmission of the film produced in Example 5. image.

In the following, a method for producing a molded article having a concavo-convex pattern (hereinafter sometimes referred to as "manufacturing method") and a molded article having a concavo-convex pattern (hereinafter sometimes referred to as "molded article") will be described in detail. .

The production method of the present invention includes at least a melting step of producing a melt kneaded material containing at least a thermoplastic resin and/or a thermoplastic elastomer (hereinafter sometimes referred to as "resin or the like") and glass wool; and an extrusion step by extrusion molding a method of extruding the melt-kneaded product from a discharge port of an extrusion die to prepare a molded article; and a cooling step of extruding the molded article in the extrusion step cool down. The molded article can be formed into a concave-convex shape by a melting step, an extrusion step, and a cooling step. Further, the manufacturing method may include other steps including a printing step of printing the surface of the molded article or the like after the cooling step as needed. Other steps such as a printing step may be carried out by a known method.

The thermoplastic resin is not particularly limited as long as it can be mixed with the glass wool. For example, thermoplastic resins such as general-purpose plastics, engineering plastics, and super engineering plastics have been used. Specifically, as a general-purpose plastic, polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), polyvinylidene chloride, polystyrene (PS), polyvinyl acetate (PVAc) may be mentioned. Polytetrafluoroethylene (PTFE), acrylonitrile butadiene styrene resin (ABS resin), styrene acrylonitrile copolymer (AS resin), acrylic resin (PMMA), and the like. As the engineering plastics, polyamine (PA), polyacetal (POM), polycarbonate (PC), modified polyphenylene ether (m-PPE), modified by polystyrene, modified PPE, PPO (Polyphenylene Oxide; polyphenylene ether), polybutylene terephthalate (PBT), polyethylene terephthalate (PET), syndiotactic polystyrene (SPS), cyclic polyolefin (COP), etc. As super engineering plastics, polyphenylene sulfide (PPS), polytetrafluoroethylene (PTFE), polyfluorene (PSF), polyether oxime (PES), amorphous polyarylate (PAR), polyetheretherketone (PEEK), thermoplastic polyimine (PI), polyamidimide (PAI), and the like. These resins may be used alone or in combination of two or more.

The thermoplastic elastomer is not particularly limited as long as it can be mixed with glass wool. For example, an ethylene-propylene copolymer, an ethylene-propylene-diene copolymer, a styrene-diene block copolymer, a styrene-diene-styrene block copolymer, and a hydride of the copolymers may be used. These thermoplastic elastomers may also be used in combination. Further, the above thermoplastic resin may be used in combination with a thermoplastic elastomer.

In the present invention, the glass wool refers to a glass fiber having a fiber diameter of about 1 μm to 7 μm. (A) in Fig. 1 is a photograph of glass wool. On the other hand, a glass fiber (glass long fiber) having a fiber diameter of 10 μm to 18 μm is also known as a reinforcing material added to a thermoplastic resin or the like (see (B) in Fig. 1). The glass fiber is usually used in the form of a chopped stand in which 50 to 200 fibers are gathered and cut into a predetermined length. As shown in (A) of FIG. 1 and (B) of FIG. 1, the glass wool and the glass fiber are completely different in the manufacturing method and the purpose of use. In addition, when glass fiber is added to a resin or the like, it cannot be extruded by an expansion method, and even if it is extruded by a T-die method, the glass fiber protrudes from the surface of a molded article such as a sheet, which is liable to be easily broken. . On the other hand, in the case where glass wool is added, a concave-convex pattern can be formed on the surface of the molded article as shown in the later-described embodiment.

The glass wool is produced by ejecting molten glass by rotating a rotator having a plurality of small holes of about 1 mm around it at a high speed. This manufacturing process is generally referred to as centrifugation. By adjusting the viscosity and rotational speed of the molten glass, it is economical to manufacture fine glass wool of about 1 μm to 7 μm. again Although glass wool can be manufactured by the above method, a commercially available product can also be used.

In the melting step, glass wool may be added to the molten resin or the like to prepare a melt kneaded product, or a large amount of masterbatch particles containing glass wool may be prepared in advance, and the master batch particles may be mixed with the glass wool-free particles. .

The masterbatch particles containing glass wool may be produced by a known method. In addition, the glass wool is an inorganic material, and the resin or the like is an organic material. Therefore, if only the glass wool is simply filled in a resin or the like, the adhesion between the glass wool and the resin is weak. Therefore, the glass wool may be surface-treated with a decane coupling agent, and then added to a resin or the like.

The decane coupling agent is not particularly limited as long as it is a decane coupling agent used in the prior art, and may be determined in consideration of reactivity with a resin or the like, thermal stability, and the like. For example, a decane coupling agent such as an amine decane type, an epoxy decane type, an acrylic decane type, or a vinyl decane type can be mentioned. As the decane coupling agent, a Z series manufactured by Toray-Dow Corning Co., Ltd., a KBM series manufactured by Shin-Etsu Chemical Co., Ltd., a KBE series, and a product manufactured by JNC Co., Ltd. may be used.

The above decane coupling agent can be subjected to surface treatment of glass wool by dissolving in a solvent and spraying and drying the glass wool. The weight percentage of the decane coupling agent relative to the aforementioned glass wool is from 0.1% by weight to 2.0% by weight, preferably from 0.15% by weight to 0.4% by weight, and more preferably from 0.24% by weight.

Glass wool can also be surface treated with a lubricant. When the glass wool is kneaded into a resin or the like, the lubricant can be easily filled into a resin or the like, and it is not particularly limited. For example, an lubricant such as an oxime oil can be used. Jia is a cup of aromatic hydrocarbons. Since anthrone is an oil, it lacks affinity with a resin, etc., but a calixarene is a phenol resin, and it improves the slip of glass wool, and is excellent in affinity with resin, etc., and can maintain the fiber length of glass wool. In the state, it is filled in a resin or the like.

The surface treatment of the glass wool is carried out by spraying a solution in which the calixarene is dissolved in the glass wool and drying it. The above solution in which the calixarene is dissolved can be produced by a known method, and for example, a plastic modifier NanodaX manufactured by Nanodax Co., Ltd. can also be used. The weight percentage of the plastic modifier NanodaX relative to the glass wool is preferably from 0.001% by weight to 0.5% by weight, more preferably from 0.01% by weight to 0.3% by weight.

The glass wool may be treated with the above-described decane coupling agent or lubricant, or may be treated with a decane coupling agent and a lubricant.

Further, in addition to the surface treatment of the above-described decane coupling agent and/or lubricant, the glass wool may be made of an epoxy resin, a vinyl acetate resin, a vinyl acetate copolymer resin, a urethane resin, or an acrylic resin. A known film forming agent such as a resin is subjected to surface treatment. These film forming agents may be used singly or in combination of two or more kinds, and the weight of the film forming agent may be The fraction is preferably from 5 to 15 times the decane coupling agent.

In the melting step, a known melt-kneading machine such as a uniaxial or multi-axis extruder, a kneader, a kneading roll, a Banbury mixer, or the like, a resin, a glass wool, and various additives added as needed are used in 200. Melt and knead at a temperature of from °C to 400 °C.

The content of the glass wool is preferably from 1% by weight to 20% by weight, more preferably from 1% by weight to 10% by weight, even more preferably from 2% by weight to 5% by weight. If the content of the glass wool is less than 1% by weight, it is difficult to form a concave-convex pattern. On the other hand, when the content of the glass wool exceeds 20% by weight, the strength of the molded article is lowered, which is not preferable. In the present invention, the term "glass wool content" means the weight of the glass wool / (the weight of the thermoplastic resin and/or the thermoplastic elastomer).

Further, in the melting step, a known ultraviolet absorber, a stabilizer, an antioxidant, a plasticizer, a colorant, a toner, a flame retardant, and an antistatic agent may be formulated within a range not impairing the object of the present invention. Additives such as agents, fluorescent whitening agents, matting agents, and impact strength improvers.

The extrusion step is not particularly limited as long as it is a method of producing a molded article by extruding the melt kneaded product produced in the melting step from the discharge port of the extrusion die by an extrusion molding method. For example, by extruding the melt kneaded material from the annular discharge port, a slightly thick tubular molded article can be extruded. This manufacturing method is useful for filling a tube or the like of cosmetics, foods, and the like.

Further, the melt-kneaded product may be extruded from the annular discharge port by an expansion method to produce a molded article. The molded article produced by the expansion method may be cut into a flat film before being wound up, or may be formed into a cylindrical body. When the cylindrical body is pressed by the roller having the unevenness, the film constituting the cylindrical body is next, and thus the cylindrical body having the unevenness cannot be produced by the expansion method. However, in the present invention, by adding glass wool to a resin or the like, it is particularly useful for the production of a tubular body by the expansion method without performing uneven processing on the molded article to form a concave-convex pattern. In the case where a garbage bag or the like is produced from a cylindrical body, since the surface is formed with a concavo-convex shape, the bag can be easily opened.

Further, in the extrusion step, the following method (T-die method) may be used: a mold having a linear discharge port called a T-die is provided at the front end of the extruder to extrude a flat material. The molded article is continuously produced. In the T-die method, the film is cooled by a mirror-treated chill roll, and the width of the film is adjusted by cutting the end portion until the final winding. Previously, a concave-convex pattern was formed by setting one of the rolls to a roll having irregularities. However, in the present invention, by adding glass wool to a resin or the like to form a concave-convex pattern on the surface of the film, it is not necessary to use a roller having irregularities. Further, in the case where deeper unevenness (wrinkles) is to be formed, the film having the uneven pattern may be further pressed by the roller having the unevenness.

The molded article may be a single layer or a plurality of layers. In the case of forming a plurality of layers, as long as the co-extrusion is performed at the extrusion step, the above-mentioned co-extrusion system will be various A method in which raw materials are extruded and overlapped at one time. For example, in the case of the expansion method, a pre-die lamination method in which each molten resin is brought into contact in a feed block before the mold; a laminating method in the die which is in contact with the inside of the mold; a plurality of self-concentric circles The outer lamination method of the die which is discharged and contacted in the discharge port.

Further, in the case of the T-die method, a single manifold method or a multi-manifold method in which a plurality of extruders are connected to a feed block via a socket to a feed block immediately before entering the die is exemplified. The single manifold method molds a film by passing a resin or the like into a feed block through a die. The number of layers can be set by replacing the socket, so that a multilayer film can be obtained relatively simply. The multi-manifold method uses a T-die having a plurality of manifolds inside to allow the resin supplied from a plurality of extruders to contact before coming to the discharge port to be laminated. It is possible to coextrude a material having a poor physical property such as a difference in viscosity, and it is also easy to adjust the thickness of each layer.

In addition, although the above-mentioned expansion method and the T-die method are representative examples of the production method of the co-extruded laminated molded article, other manufacturing methods such as a lamination method may be used as long as a laminated molded article is finally obtained. Further, in general, when a molded article is produced by an extrusion molding method, the physical properties of the molded article are often different from the vertical direction in the extrusion direction. However, as shown in the later-described embodiment, the molded article of the present invention has an effect of reducing the physical properties of the extrusion direction and the vertical direction by adding glass wool.

In the case where the molded article is a laminated multi-layer product, it is preferably a multi-layer product At least one layer of the outer layer is a layer obtained by extruding a melt kneaded material such as a resin or glass wool. By adding the glass wool, the uneven pattern is formed on the outer layer, so that a high-grade feeling is imparted, and the molded article can be prevented from being in close contact with each other. Further, in the case of a multilayer product, a layer obtained by extruding a melt kneaded material such as a resin or a glass wool may be formed as an inner layer of a multilayer product. In the case of forming the inner layer, the specific surface area is increased by the uneven pattern, so that the adhesion to the upper and lower layers is improved.

In the cooling step, the extruded melt kneaded material may be cooled by a known method, and for example, it may be cooled by air cooling or the like.

The shape of the molded article is preferably a film, a sheet or a cylindrical body. Further, in the present invention, according to JIS (Japanese Industrial Standards), "film" means "film of plastic having a thickness of less than 250 μm", and "sheet" means "thin sheet of plastic having a thickness of 250 μm or more". Shaped. The thickness of the molded article (film, sheet, or cylindrical body) is not particularly limited as long as it is thicker than the diameter of the glass wool to be added, and can be formed by an extrusion molding method, and is preferably about 3 μm. It is about 300 μm, more preferably about 5 μm to 275 μm, and still more preferably about 8 μm to 250 μm. When it is about 3 μm or less, the molded article is too thin and is easily broken. In addition, when it is about 300 μm or more, the uneven pattern is formed, and the film is less likely to be in close contact with each other, and the advantage of being inferior in physical properties in the extrusion direction and the vertical direction of the molded article is reduced.

Further, in the present invention, the "molded article" is not related to a single layer or a plurality of layers. It refers to an article obtained by extruding a melt-kneaded product by extrusion molding and cooling it. Therefore, the thickness of the molded article is about 3 μm to 300 μm, which means the thickness of the sheet, the film or the tubular body itself produced by the extrusion molding method, and does not mean that the articles are attached to a board or the like. The thickness of the finished product.

Furthermore, the present inventors have made a patent application for a composite material in which a glass wool is filled with a thermoplastic resin (refer to Japanese Patent No. 5220934). However, the composite forming material described in Japanese Patent No. 5220934 is an invention for extending the fiber length of the glass wool filled in the thermoplastic resin and increasing the filling amount of the glass wool, and only the injection molding is described as the form of the article. Particles and injection molded articles. On the other hand, the molded article of the present invention is formed by extrusion from the discharge port of the extrusion die. In the case of injection molding, since the composite forming material is emitted from the mold, the uneven shape is not formed in the molded article. Therefore, the method for producing a molded article having the uneven pattern of the present invention and the molded article having the uneven pattern formed are different from the production method and the injection molded article described in Japanese Patent No. 5220934.

Examples of the use of the molded article of the present invention include a waterproof sheet, a concrete-formed waterproof material, a roofing substrate, a decorative board decorative material, and an underfloor waterproofing material; and a waterproof sheet, a pipe protective material, and the like; Decorative materials, interior materials, and other vehicles; waterproof sheets, interior materials, etc.; cosmetics bottles, merchandise bottles, shopping tote bags, plastic bags, garbage bags, etc.; multi-layer film, plastic shed, fertilizer bag, rice bag , food bags and other agricultural uses. The molded article may be processed into various uses by cutting, heat sealing or the like as needed.

The invention is specifically described by the following examples, which are merely illustrative of the invention and are provided as a reference to the specific aspects of the invention. The illustrations are intended to illustrate specific aspects of the invention, but are not intended to limit or limit the scope of the invention disclosed herein.

[Examples]

[Production of masterbatch pellets]

Polypropylene (PP, AZ564 manufactured by Sumitomo Chemical Co., Ltd.) was used as the thermoplastic resin. Glass wool is produced by centrifugation and has an average fiber diameter of about 3.6 μm.

The surface treatment of the glass wool is carried out by spraying a solution containing a decane coupling agent to a glass wool which is fibrillated by a spinner from a spinner. As the decane coupling agent, an amino decane coupling agent S330 (manufactured by JNC Corporation) was used. The weight percentage of the decane coupling agent relative to the glass wool was 0.24% by weight.

Then, the glass wool was dried at 150 ° C for 1 hour, and then subjected to a pulverization treatment with an average fiber length of 850 μm by a cutter mill. A co-axial twin-shaft kneading extruder ZE40A ((φ43 L/D=40), manufactured by Bellstorf Co., Ltd.) was used as an extrusion molding machine, and a weight screw feeder S210 (manufactured by K-Tron Co., Ltd.) was used as a metering device. Glass wool in molten polypropylene The glass wool was added and kneaded in such a manner that the content was 40% by weight. The kneading conditions were kneaded under the conditions of a screw rotation speed of 150 rpm, a resin pressure of 0.6 MPa, a current of 26 A to 27 A, and a feed amount of 12 kg/hr. Further, the temperature of the resin of the polypropylene during the kneading was 190 ° C to 280 ° C, and the glass wool was heated to 100 ° C and added. After the mixing, the masterbatch pellets are prepared.

[Production of bag using expansion method]

<Example 1>

The CO-MP manufactured by Sumitomo Heavy Industries Modern Co., Ltd. was used as an expansion device. First, a masterbatch pellet and a high-density polyethylene (HDPE; HI-ZEX7000F by PRIME POLYMER) were blended to form a resin mixture so that the content of the glass wool was 4.5% by weight. Then, the resin mixture was melted and kneaded at 180 ° C to 230 ° C to prepare a melt kneaded product. Then, the melt kneaded material was extruded from the annular discharge port to produce a cylindrical body (molded article). Then, the cylindrical body is cut into an appropriate size, and a part of the cut cylindrical body is heat-sealed, thereby producing a pouch. The thickness of the bag is about 35 μm. (A) in Fig. 2 is a photograph of a bag produced in Example 1.

<Comparative Example 1>

A bag was prepared in the same manner as in Example 1 except that the masterbatch particles were not added. The thickness of the bag was about 28 μm. (B) in Fig. 2 is a photograph of a bag produced in Comparative Example 1.

As shown in (A) of FIG. 2 and (B) of FIG. 2, in Embodiment 1 The bag produced is formed with a concave-convex pattern on the entire surface. On the other hand, the surface of the bag produced in Comparative Example 1 was smooth.

<Example 2>

The low-density polyethylene (LDPE; Sumikasen F200-0 manufactured by Sumitomo Chemical Co., Ltd.) was used instead of the high-density polyethylene of Example 1, and the content of the glass wool was 2% by weight, and the amount of the blown air was adjusted during expansion. A bag was produced in the same manner as in Example 1 except that the thickness was set to about 9 μm. Figure 3 is a photograph of a bag made in Example 2. As shown in Fig. 3, the bag produced in Example 2 was formed with a concavo-convex pattern on the entire surface. In addition, the opening of the bag can be easily opened.

<Example 3>

Then, a two-layer film was produced by co-extrusion using an expansion method. The masterbatch pellets and low-density polyethylene (LDPE; Sumikasen F200-0, manufactured by Sumitomo Chemical Co., Ltd.) were blended in such a manner that the content of the glass wool was 10% by weight, and the resin mixture was melted and kneaded at 210 ° C to prepare a melt kneading. Things. The other layer was made into a melt kneaded product in the same order as the one layer except that the masterbatch particles were not added. Then, using the CO-RD die rotary type manufactured by Sumitomo Heavy Industries Modern Co., Ltd. (the method of laminating in the mold in the path inside the mold), the molten kneaded material is coextruded from the annular discharge port, and This produced a two-layer cylindrical laminated film. The thickness of each layer was 75 μm.

(A) in Fig. 4 is a photograph of the layer side containing glass wool, in Fig. 4 (B) is a photograph of the side of the layer containing no glass wool. As shown by (A) in FIG. 4 and (B) in FIG. 4, the layer to which the glass wool is added is formed with a concavo-convex pattern on the entire surface. On the other hand, the surface of the layer to which the glass wool is not added is smooth. In addition, the layers were not peeled off and firmly followed.

<Example 4>

A butyl rubber (Butyl 065 manufactured by JSR Co., Ltd.) as a thermoplastic elastomer was used instead of the low density polyethylene of Example 3, and the content of the glass wool of one layer was set to 2% by weight, and Example 3 was used. A two-layer laminated film was produced in the same manner. The thickness of each layer was 75 μm.

Fig. 5 (A) is a photograph of the layer side of the glass wool, and (B) of Fig. 5 is a photograph of the layer side of the glass wool. As shown by (A) in FIG. 5 and (B) in FIG. 5, the layer to which the glass wool is added is formed with a concavo-convex pattern on the entire surface. On the other hand, the surface of the layer to which the glass wool is not added is smooth. In addition, the layers were not peeled off and firmly followed.

As a result of the above, when a molded article is produced by the expansion method, by adding glass wool to the thermoplastic resin and/or the thermoplastic elastomer, a molded article having a concave-convex pattern formed on the surface can be produced without adding a special step.

[Production of film using T-die method]

<Example 5>

T-type die device is used by Sumitomo Heavy Industries Modern Co., Ltd. Manufactured SPS7000. First, masterbatch pellets and high-density polyethylene (HDPE; HI-ZEX7000F by PRIME POLYMER) were blended to form a resin mixture so that the content of the glass wool was 4% by weight. Then, the resin mixture was melted and kneaded at 230 ° C to prepare a melt kneaded product. Then, the melt kneaded product was extruded from a T-die to thereby produce a film. The thickness of the film was 30 μm. (A) of Fig. 6 is a photograph of the film produced in Example 5.

<Comparative Example 2>

Films were produced in the same manner as in Example 5 except that the masterbatch particles were not added. The thickness of the film was about 23 μm. (B) in Fig. 6 is a photograph of a film produced in Comparative Example 2.

As shown in (A) of FIG. 6 and (B) of FIG. 6, the surface of the film produced in Example 5 was formed with a concavo-convex pattern. On the other hand, the surface of the film produced in Comparative Example 2 was smooth. From the above results, by adding glass wool to the thermoplastic resin and/or the thermoplastic elastomer, it is possible to produce a molded article having a concave-convex pattern on the surface without adding a special step even in the T-die method. Therefore, in the T-die apparatus in which the roller having the unevenness is not disposed, a molded article in which the uneven pattern is formed can be produced.

[Production of a cylindrical body by extrusion method]

<Example 6>

The extrusion device is a tube manufactured by Marth Seiki Co., Ltd. Cartridge device P-50. First, masterbatch pellets and high-density polyethylene (HDPE; HI-ZEX5000SF manufactured by PRIME POLYMER) were blended to form a resin mixture so that the content of the glass wool was 2.5% by weight. Then, the resin mixture was melted and kneaded at 235 ° C to prepare a melt kneaded product. Then, the melt kneaded product was extruded from an extrusion circular die to thereby produce a cylindrical body. Further, the method of Example 6 differs from the expansion method in that no press air is supplied when the melt kneaded material is extruded. Further, the thickness of the cylindrical body was 60 μm. (A) in Fig. 7 is a photograph of a cylindrical body extruded. As is clear from (A) of Fig. 7, a concave-convex pattern was formed on the surface of the cylindrical body to be produced.

(B) in Fig. 7 is a photograph of a cylindrical body after printing. In the prior art, since the surface of the cylindrical body produced by the extrusion method has a mirror-like shape, it is difficult to directly print the extruded tubular body, so that the printed paper is attached to the tubular body. By adding glass wool to a resin or the like, a concave-convex pattern is formed on the surface of the cylindrical body, so that the cylindrical body can be directly printed.

(C) in Fig. 7 is a photograph of a spiral which is used to tighten the lid in the cylindrical body by heat pressing. A molded article of a tubular body can be produced by heat-sealing after filling a content such as a cosmetic.

[Tensile properties of film produced by expansion method]

<Example 7>

a masterbatch pellet, butyl rubber (Butyl 065, manufactured by JSR Corporation), and a glass wool content of 2% by weight, and HDPE (HI-ZEX7000F manufactured by PRIME POLYMER) was mixed, and the other layer was mixed with masterbatch pellets and high-density polyethylene (HDPE; HI-ZEX7000F manufactured by PRIME POLYMER) in such a manner that the content of the glass wool was 2% by weight. A two-layer laminated film was produced in the same manner as in Example 3 except for the same procedure as in Example 3. The thickness of each layer was 75 μm.

<Comparative Example 3>

The first layer is only made of high-density polyethylene (HDPE; HI-ZEX7000F manufactured by PRIME POLYMER), and the other layer is high-density polyethylene (HDPE; HI-ZEX7000F manufactured by PRIME POLYMER) and LDPE (NEO-ZEX2006H manufactured by PRIME POLYMER) A two-layer laminated film was produced in the same manner as in Example 3 except that mixing was carried out. The thickness of each layer was 75 μm.

Then, the tensile strength of the film produced in Example 7 and Comparative Example 3 was examined. The tensile tester was carried out using KS D 3001:2001 manufactured by Galdavini Co., Ltd. under the experimental conditions of KSM4394. The test results are shown in Table 1.

As shown in Table 1, the film-added glass wool film of Example 7 had substantially the same extrusion direction as the vertical direction. On the other hand, Comparative Example 3 The film without the glass wool is different in the extrusion direction from the vertical direction. The expansion method is a method in which a film or a sheet can be formed inexpensively and in a large amount, but the difference in strength between the longitudinal direction and the transverse direction of the produced film or sheet is exemplified as a problem. However, it is known from the above that this problem can be solved by adding glass wool to a resin or the like.

[X-ray transmission image of the film produced]

The X-ray transmission image was taken for the film produced by the expansion method in the above Example 1 and the film produced by the T-die method in Example 5. The X-ray transmission image was taken using a HITACHI CS-SEMCS 4800 at 30 kV and 180 μA. In Fig. 8, (A) is an X-ray transmission image of the film produced in Example 1, and (B) in Fig. 8 is an X-ray transmission image of the film produced in Example 5. As indicated by (A) in Fig. 8, it was confirmed that the glass wool was dispersed in the film in a random direction. It was confirmed in the above-mentioned Example 7 that by adding glass wool to a resin or the like, the difference in strength between the longitudinal direction and the transverse direction of the produced film or sheet can be reduced, and as a reason for the above, it is considered that the glass wool is considered to be the reason. Disperse in the film in a random direction. Further, as shown by (B) in Fig. 8, even in the film produced by the T-die method, the glass wool is dispersed in a random direction. Therefore, the molded article produced by the T-die method can also reduce the difference in strength between the longitudinal direction and the transverse direction.

(industry availability)

According to the method for producing a molded article having a concave-convex pattern of the present invention, even if the device used in the prior art is used, the unevenness is not applied. It is also possible to manufacture a molded article having a concave-convex pattern. Therefore, it is useful for the manufacture of a film, a sheet, a cylindrical body, etc.

Claims (13)

A method for producing a molded article having a concave-convex pattern, comprising: a melting step of preparing a melt-kneaded product, the melt-kneaded product comprising at least a thermoplastic resin and/or a thermoplastic elastomer and glass wool; and an extrusion step by extrusion The molding method extrudes the melt-kneaded product from the discharge port of the extrusion die to prepare a molded article, and a cooling step of cooling the molded article extruded in the extrusion step. The method for producing a molded article having a concavo-convex shape as described in claim 1, wherein the glass wool content is from 1% by weight to 20% by weight. The method for producing a molded article having a concavo-convex shape as described in claim 1 or 2, wherein the extrusion molding method is an expansion method or a T-die method, and the molded article is a film, a sheet or a cylindrical body. The method for producing a molded article having a textured shape according to claim 1 or 2, wherein the extrusion molding method is a co-extrusion method; and the molded article is formed as a multilayered product; At least one layer of the outer layer is a layer formed by extruding the melt kneaded material, and the melt kneaded material contains at least the thermoplastic resin/thermoplastic elastomer and glass wool. The method for producing a molded article having a concavo-convex shape as described in claim 3, wherein the extrusion molding method is coextrusion by an expansion method or coextrusion by a T-die method; The form of the product is formed; At least one layer of the outer layer of the multilayered product is a layer formed by extruding the melt-kneaded product, and the melt-kneaded product contains at least the thermoplastic resin/thermoplastic elastomer and glass wool. A molded article formed with a concave-convex pattern contains at least a thermoplastic resin and/or a thermoplastic elastomer and glass wool. The molded article in which the uneven pattern is formed as described in claim 6, wherein the glass wool is contained in an amount of from 1% by weight to 20% by weight. The molded article in which a concave-convex pattern is formed as described in claim 6 or 7, wherein the molded article is a film, a sheet or a cylindrical body. The molded article according to claim 6 or 7, wherein the molded article is a multilayered product; and at least one of the outer layer of the multilayered product comprises at least the thermoplastic resin and/or thermoplastic elastomer and glass wool. Floor. The molded article having a concave-convex pattern formed according to claim 8, wherein the molded article is a multilayered product, and at least one of the outer layer of the multilayered product is a layer containing at least the thermoplastic resin and/or the thermoplastic elastomer and the glass wool. The molded article having a concavo-convex shape as described in claim 8, wherein the molded article has a thickness of from 3 μm to 300 μm. The molded article having a concavo-convex shape as described in claim 9, wherein the molded article has a thickness of from 3 μm to 300 μm. The molded article having a concavo-convex shape as described in claim 10, wherein the molded article has a thickness of from 3 μm to 300 μm.