JP2010064289A - Resin molding, method of molding resin molding, resin molding manufactured by the method, and packaging vessel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a resin molding capable of improving the adhesion of resin without complicating a manufacturing process, and to provide a method of molding the resin molding. <P>SOLUTION: When the resin molding having an adhesive surface is molded, the molding is molded of the resin mixed with an inorganic filler to make the surface roughness of the adhesive surface rougher than the surface of the molding molded of only the resin. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a resin molded product having an adhesive surface.

Conventionally, the technique of patent document 1 is known as a technique of the resin molding which has an adhesive surface. According to this publication, when heat sealing is performed using a hot-melt type adhesive, the upper surface of the flange serving as the bonding surface is subjected to a roughening process to form fine irregularities to obtain a sealing strength.
JP 2006-327650 A

  However, in the technique described in Patent Document 1, although a slight improvement in adhesiveness can be expected, it is necessary to separately perform a thermal crystallization treatment using a porous metal material after forming the container. There has been a problem of complication.

  In view of the above-described problems of the prior art, the present invention provides a resin molded product capable of improving adhesion without complicating the production process for the resin and a method for molding the resin molded product. With the goal.

  The resin molded product according to the first invention is a resin molded product having an adhesive surface to which a member to be bonded is attached via an adhesive, and the surface roughness of the adhesive surface is a resin. Inorganic fillers having an average particle diameter of 10 to 100 μm are kneaded so as to be coarser than when formed only by the above method.

  The resin molded product according to the second invention is a resin molded product having an adhesive surface to which a member to be bonded is attached via an adhesive, and is bonded to the resin rather than the resin. An inorganic filler having a high average particle diameter of 10 to 100 μm is kneaded to expose the inorganic filler on the surface of the adhesive surface.

  In the resin molded product according to the third aspect of the invention, an inorganic filler having an average particle size of 10 to 100 μm having a higher adhesive force to the adhesive than the resin is used, and the surface roughness of the adhesive surface is the resin. It knead | mixes so that it may become coarse rather than the time of shape | molding only, and the said inorganic filler was exposed to the surface of the said adhesive surface, It is characterized by the above-mentioned.

  In the method for molding a resin molded product according to the fourth aspect of the present invention, an adhesive surface molding means capable of raising the temperature to the first predetermined temperature and molding the adhesive surface, and a first temperature higher than the first predetermined temperature. When molding by using a molding means that can be heated to a predetermined temperature of 2 and molding other than the adhesive surface, and interposing the molten resin kneaded with the inorganic filler between the adhesive surface molding means and the molding means, The first predetermined temperature and the second predetermined temperature are characterized in that the bonding surface is made rougher than other than the bonding surface.

  In the method for molding a resin molded product according to the fifth aspect of the present invention, an adhesive surface molding means capable of raising the temperature to the first predetermined temperature and molding the adhesive surface, and a first temperature higher than the first predetermined temperature. And a molding means that molds a portion other than the adhesive surface, and is capable of raising the temperature to a predetermined temperature of 2. The adhesive surface molding means and the molding means are mixed with an inorganic filler having a higher adhesion to the adhesive than the resin. The first predetermined temperature and the second predetermined temperature are the temperatures at which the inorganic filler is exposed on the surface of the adhesive surface.

  In the molding method of the resin molded product according to the sixth aspect of the present invention, an adhesive surface molding means that can raise the temperature to the first predetermined temperature and molds the adhesive surface, and a first one that is higher than the first predetermined temperature. And a molding means that molds a portion other than the adhesive surface, and is capable of raising the temperature to a predetermined temperature of 2. The adhesive surface molding means and the molding means are mixed with an inorganic filler having a higher adhesion to the adhesive than the resin. The first predetermined temperature and the second predetermined temperature are such that the inorganic filler is exposed on the surface of the bonding surface, and the bonding surface is rougher than other than the bonding surface. It is the temperature which becomes.

  In the resin molded product according to the first invention, it is possible to form irregularities on the adhesive surface simply by kneading the inorganic filler, and easily improve the adhesiveness without complicating the manufacturing process. be able to.

  In the resin molded product according to the second invention, since the inorganic filler having a higher adhesive force to the adhesive than the resin is exposed on the surface of the adhesive surface, the adhesiveness can be improved.

  In the resin molded product according to the third invention, it is possible to improve a plurality of factors that improve the adhesive force without complicating the manufacturing process, and further improve the adhesive force. .

  In the method for molding a resin molded product according to the fourth invention, the temperature of the adhesive surface molding means is made lower than the temperature of the molding means when molding the resin kneaded with the inorganic filler. That is, it is known that if the kneading amount of the inorganic filler is increased, the mechanical properties are lowered although roughening can be expected. Now, since the purpose is to roughen the bonding surface, it is desirable that only the bonding surface contains a large amount of inorganic filler, and other than that, the amount of inorganic filler is small.

  Here, in general, the temperature of the molding means at the time of molding is raised to a temperature that can relatively ensure the fluidity of the resin, so there is no anisotropy in the fluidity of the inorganic filler between the molding means, and the unit volume The dispersion density, which is the number of inorganic fillers contained in, is also uniformly distributed. On the other hand, in the second invention, the temperature of the molding means is increased to ensure the fluidity of the resin, while the temperature of the adhesive surface molding means is lowered to decrease the fluidity of the resin. Once the inorganic filler kneaded in the molten resin comes into contact with the surface in contact with the adhesive surface forming means having a low temperature, the inorganic filler becomes difficult to flow. When this phenomenon is repeated, the dispersion density of the inorganic filler decreases on the side of the molding means with high fluidity, whereas the dispersion density of the inorganic filler increases on the side of the adhesive surface molding means with low fluidity.

  By the above action, it becomes possible to have a distribution of dispersion density between the adhesive surface and the other surface. The adhesive surface is roughened, and the adhesive is applied to the concave portion formed by the roughening. The adhesive strength can be improved by applying, and the mechanical properties of the container can be ensured by lowering the density of the inorganic filler except on the adhesive surface. Moreover, since the anisotropy of the density distribution can be obtained only by raising the temperature of the forming means and the adhesive surface forming means to different temperatures, the manufacturing cost can be suppressed without going through a plurality of manufacturing steps.

  In the molding method of the resin molded product according to the fifth invention, the temperature of the adhesive surface molding means is made lower than the temperature of the molding means, as in the third invention. At this time, the inorganic filler is exposed on the surface of the adhesive surface, not the roughened surface. Therefore, the first predetermined temperature and the second predetermined temperature are set within a range where the inorganic filler is exposed. That is, even if the surface is not necessarily roughened, the inorganic filler only needs to be exposed.

  Thus, as explained in the fourth invention, it is possible to have a distribution of dispersion density between the adhesive surface and the other surface, and by exposing the inorganic filler on the adhesive surface. On the other hand, the mechanical properties of the container can be ensured by lowering the density of the inorganic filler except on the adhesive surface. Moreover, since the anisotropy of the density distribution can be obtained only by raising the temperature of the forming means and the adhesive surface forming means to different temperatures, the manufacturing cost can be suppressed without going through a plurality of manufacturing steps.

  In the method for molding a resin molded product according to the sixth invention, it is possible to obtain both the effect according to the fourth invention and the effect according to the fifth invention, and complicate the manufacturing process. Therefore, it is possible to improve a plurality of factors that improve the adhesive strength, and further improve the adhesive strength.

  When the resin molded product according to the first to sixth inventions is a resin container, and the resin molded product is applied to a packaging container in which the opening of the resin container is sealed with a laminated film, While adhering an adhesive surface and a laminated film through an adhesive, and sealing with the adhesive, a packaging container that secures both adhesiveness and sealing performance can be provided. Note that the term “sealing” means that an air passage such as air inside or outside the container is blocked. Therefore, in the present invention, the state in which the adhesive is applied so as to fill the portion that can serve as the ventilation path is shown regardless of the state of the surface of the adhesive surface and the state of the adhesive surface on the laminated film side. Moreover, since the adhesiveness is ensured, the state in which the ventilation path is filled is easily maintained, and the airtightness can be secured against the pressure fluctuation accompanying the temperature change and the force acting on the laminated film unexpectedly. .

  Hereinafter, the best embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a perspective view of a resin container 1 according to the first embodiment, and FIG. 2 is a partially enlarged sectional view of a region A of the resin container 1. The resin container 1 has a cylindrical portion 10 whose upper side is expanded compared to the lower side, a bottom portion 15 that closes the lower end of the cylindrical portion 10, and a drinking mouth portion 14 that is expanded from the upper end of the cylindrical portion 10. The cylindrical portion 10, the bottom portion 15, and the drinking mouth portion 14 are each formed with a uniform thickness of 1.0 mm. The cylindrical portion 10, the bottom portion 15, and the drinking mouth portion 14 have a container inner surface 12 that comes into contact with the contents, and a container outer surface 11 that is the back surface of the container inner surface 12. For example, in order to pour a hot beverage or the like into the resin container 1 and hold an appropriate place on the container outer surface 11 of the cylindrical portion 10, it is important to ensure the heat insulation of the resin container 1.

  In addition, a flat annular adhesive surface 142 is formed on the upper surface of the mouthpiece 14 of the resin container 1, an inorganic filler having an average particle size of 10 to 100 μm is exposed on the surface of the adhesive surface 142, and the adhesive surface An adhesive is applied to the concave portion of 142 to flatten the outermost surface of the bonding.

  Thereafter, the laminated film 3 is placed on the annular adhesive surface 142 of the resin container 1, and a predetermined pressing force is applied by a hot plate (not shown) heated to a temperature equal to or higher than the heat seal temperature from above the laminated film 3. Is added to thermally bond the annular bonding surface and the laminated film 3 to each other. The flattened annular adhesive surface 142 is adhered to the laminated film 3 via this adhesive (hot melt 4) to form a packaging container.

  Instead of previously applying an adhesive to the concave portion of the annular bonding surface 142 of the resin container 1, an adhesive (in advance) is applied to the to-be-bonded portion of the laminated film 3 bonded to the bonding surface 142. The hot melt 4) is applied, and the laminated film 3 is placed on the resin container 1 so that the annular adhesive application portion of the laminated film 3 faces the annular adhesive surface 142 of the resin container 1. Then, by placing a hot plate heated to a temperature equal to or higher than the heat seal temperature on the laminated film 3 and applying a pressing force, the adhesive applied to the laminated film 3 is melted and the annular bonding surface 142 is formed. You may make it adhere | attach with the adhesive surface 142 while filling a recessed part.

  The laminated film 3 is configured to be openable by sealing the inside of the resin container 1 and peeling it off from the grip portion 3a with a predetermined force (hereinafter, peeling) by a consumer. That is, the adhesive force between the laminated film 3 and the adhesive surface 142 is such that it does not peel off even when a load such as contents is applied due to vibration during transportation, etc., and due to the peeling operation of the customer Adhesive strength (hereinafter, desired adhesive strength) that can easily peel the laminated film 3 is required.

(About resin materials)
The resin container 1 employs a liquid crystal polymer (hereinafter referred to as LCP) having chemical resistance as a thermoplastic resin. Other thermoplastic resins include polyolefin resin, polyvinyl chloride resin, polyamide resin, polyester resin, vinyl acetate resin, styrene resin, acrylate resin, biodegradable resin polylactic acid, etc. Is mentioned. Moreover, the said thermoplastic resin can be mixed suitably.

(About hot melt)
As the hot melt 4 of Example 1, a hot melt mainly composed of ethylene vinyl acetate copolymer (EVA) is employed. In general, as a typical hot melt used for bonding to thermoplastic resins such as LCP with high chemical resistance, in addition to EVA, BR series also used for packaging made by Nissin Chemical Industry Co., Ltd., Hydrogenated hot melts such as polyethylene / propylene (EP) are known. When these are used, all have low adhesiveness to the thermoplastic resin. This is also known, for example, from the descriptions of JP-A-11-240074, JP-A-2002-249754, JP-A-3326480, JP-A-4-135750, and the like. In addition, as hot melts suitable for inorganic fillers of glass materials such as glass beads 13, resins added with tackifiers such as rosin and terpenes (for example, ethylene vinyl acetate copolymer (EVA), ethylene-methacrylic acid copolymer resin) (EMAA), an ethylene-acrylic acid copolymer resin (EAA), a modified polyolefin resin, a polyester resin, or an ionomer), but it is difficult to say that all have sufficient adhesiveness. As described above, it is important to secure a desired adhesive force even in a combination with low adhesiveness.

(About inorganic fillers)
In this LCP, hollow glass beads 13 (hereinafter referred to as glass beads 13) as inorganic fillers are kneaded by 15% by weight. The average particle diameter of the glass beads 13 is appropriately selected within the range of 10 to 100 μm. The glass beads 13 are made of soda-lime borosilicate glass, and the main components are silicon dioxide (SiO ₂ ), calcium oxide (CaO), sodium oxide (Na ₂ O), and boron oxide (B ₂ O ₃ ). The heat insulating property is improved by kneading this inorganic filler. Basically, the higher the kneading amount is, the higher the adhesiveness and heat insulating properties described later are. However, since the mechanical properties tend to deteriorate, the amount considering these tradeoffs is kneaded.

  In addition to the glass beads 13, the inorganic filler having an average particle size of 10 to 100 μm includes calcium carbonate, calcium sulfate, barium sulfate, kaolin, mica, zinc oxide, dolomite, silica, chalk, talc, pigment, titanium dioxide. And inorganic mineral powder selected from the group consisting of silicon dioxide, bentonite, clay, diatomaceous earth and the like.

However, each inorganic mineral powder has a higher specific gravity than the glass beads 13. For reference, the specific gravity of glass beads, talc, calcium carbonate, glass fibers, and titanium dioxide will be described below.
Glass beads 0.6
Talc 2.9
Calcium carbonate 2.7
Glass fiber 2.5
Titanium dioxide 4.1

  As described above, the specific gravity of the glass beads 13 is very small. In other words, the other inorganic fillers have high specific gravity. In this case, there is a concern of an increase in the weight of the resin container 1 itself and brittle fracture against impact. In addition, an increase in weight causes an increase in transportation cost, and there is also a concern that an environmental load increases with an increase in incineration energy. For this reason, by adopting the hollow glass beads 13 as the inorganic filler, it is possible to reduce the weight of the resin container 1, improve the durability against impact, reduce the conveyance cost, and reduce the environmental load.

(About density distribution)
As shown in the enlarged sectional view of FIG. 2, in the resin container 1 of Example 1, the thickness of the resin container 1 is larger than the dispersion density of the glass beads 13 on the container inner surface 12 side of the cylindrical portion 10 and the bottom portion 15. The dispersion density of the glass beads 13 on the container outer surface 11 side in the vertical direction is high. Here, the dispersion density represents the number of inorganic fillers per unit volume of the resin containing the inorganic filler. Therefore, if the dispersion density is high, the number of inorganic fillers per unit volume of the resin containing the inorganic filler is large, and if the dispersion density is low, the number of inorganic fillers per unit volume of the resin containing the inorganic filler is small.

  In addition, the mouthpiece 14 has a mouthpiece lower surface 141, an adhesive surface 142, and a mouthpiece end surface 143. These are collectively referred to as the drinking mouth surface 140. The dispersion density of the glass beads 13 on the bonding surface 142 side is higher than the dispersion density of the glass beads 13 on the lower surface 141 side of the mouthpiece. Then, the glass beads 13 themselves are directly or indirectly exposed to the drinking mouth surface 140, and in particular, a large number of glass beads 13 are exposed at the bonding surface 142. The exposure of the glass beads 13 on the bonding surface 142 is intended to ensure adhesion and heat insulation. The causal relationship between the dispersion density and the adhesive force will be described later.

(Dispersion density measurement method)
Regarding the above-described measurement of the dispersion density, for example, in the case of a resin container 1 having a thickness of 1.0 mm, a cube having a piece of 0.3 mm is cut from the inner surface 12 of the container (hereinafter referred to as the first cube), and the volume V of the first cube is cut. And measure the weight W. Similarly, a cube having a piece of 0.3 mm is cut from the outer surface 11 of the container (hereinafter referred to as a second cube), and the volume V ′ and weight W ′ of the second cube are measured.

  Then, the number of glass beads 13 included in the first and second cubes is estimated from the specific gravity a of the glass beads 13 and the specific gravity b of the LCP. Hereinafter, a method for estimating the number of glass beads 13 included in the first cube will be described.

The specific gravity of the glass beads 13 is a, the specific gravity of the LCP is b, the volume of the first cube is V, the weight is W, the volume of the glass beads 13 contained in the first cube is V1, the weight is W1, and the first cube is included. When the volume of polylactic acid is V2 and the weight is W2, the relationship shown below is obtained.
V = V1 + V2
W = W1 + W2
V1 ＝ a ・ W1
V2 ＝ b ・ W2
Therefore,
V = a · W1 + b (W-W1)
Since V, W, a, and b are known values, the volume W1 of the glass beads 13 is
W1 = (V−b · W) / (ab)
It becomes.

  From the average particle diameter of the glass beads 13, the volume per one glass bead 13 (hereinafter, bead volume) W11 is calculated. A value obtained by dividing the volume W1 of the glass beads 13 by the bead volume W11 is estimated as the number N1 of the glass beads 13 included in the cut first cube. By the same method, the number N2 of glass beads 13 included in the second cube is estimated. When the estimated number is large, the variance density is high, and when the estimated number is small, the variance density is low. Therefore, in the resin container 1 of Example 1, the estimated number N2 included in the second cube is larger than the estimated number N1 included in the first cube (N1 <N2).

Using a similar method, a cube having a piece of 0.3 mm is cut from the bonding surface 142 side (hereinafter referred to as a third cube), and the number N3 of glass beads 13 included in the third cube is estimated. The relationship is shown as follows:
N1 <N2 <N3

(Causal relationship between dispersion density and adhesive strength)
Next, the causal relationship between the dispersion density and the adhesive force will be described. First, the definition of adhesion will be described. Adhesion refers to a state in which a liquid adhesive is applied between two adherends, the two are bonded together, and the adherends are fixed by solidifying or curing the liquid adhesive. This bonding is roughly divided into mechanical bonding, chemical bonding, and physical bonding.

  The mechanical adhesion is also called a throwing effect or a fastener effect, and represents a state in which a large number of small nails are driven by entering into a recess formed by roughening the surface of the adherend.

  The chemical bonding represents a bonded state as a result of a primary bond between atoms generated between the adhesive and the adherend or a bridge between the adherends due to an interatomic attractive force.

  Physical adhesion refers to a state in which the van der Waals force acts when the distance between the adhesive molecule and the adherend molecule approaches 5 angstroms or less, and the van der Waals force is combined. Here, in order for van der Waals force to act, the distance between the adhesive molecule and the adherend molecule needs to be close, so the affinity and solubility factors between the adhesive and the adherend ( Hereinafter, there is a causal relationship with wettability). If the wettability is high, the adhesive strength becomes strong, and if the wettability is low, the adhesive strength becomes weak.

  In actual bonding, adhesive is applied to the concave portion of the bonding surface in a state where a plurality of the above-mentioned bonding principles are combined, and the final bonding force and sealing performance are ensured by flattening the bonding outermost surface. . Here, as described above, the wettability is low between the LCP and the hot melt, and a sufficient adhesive force cannot be ensured. Therefore, the glass beads 13 that are inorganic fillers are kneaded into the LCP, and the anchoring surface 142 is roughened to improve anchoring hardening, and the wettability is improved as the surface becomes rough. It is intended to improve van der Waals force due to its high wettability. These points will be discussed below.

  FIG. 4 is a tensile tester for measuring the adhesive force. This tensile testing machine has a movable clamp 31, a piston 32 and a cylinder 33 that can pull the movable clamp 31 upward at a predetermined speed in FIG. Then, the tensile force required to pull up at a predetermined speed is measured. A 180 degree peeling test according to JISK6854-2 was performed using this tensile tester. As test pieces, a resin piece 30a corresponding to the resin container 1 (LCP: Zenite 6330, manufactured by DuPont) and a film piece 30b corresponding to the laminated film 3 were prepared.

  The resin piece 30a has a plate shape of 50 mm × 15 mm and has a thickness of 1.5 mm. As this resin piece 30a, a resin piece 30a was prepared by kneading 0%, 5%, 10%, 15%, and 30% of the kneading amount of glass beads (Glass Bubble: S60HS manufactured by Sumitomo 3M Co., Ltd.) in LCP. . Here, the kneaded glass beads had a particle size of 50% at 30 μm, 10% at 15 μm, and 40% at 50 μm.

  The film piece 30b was a sheet of 70 mm × 10 mm and had a thickness of 47 μm (gas barrier film made of PET 12 μm / aluminum 15 μm / PE 20 μm). PET is polyethylene terephthalate, and PE is polyethylene. The adhesive surface on the film piece 30b side is the PE side.

Hot melt mainly composed of EVA same as hot melt 4 is applied between resin piece 30a and film piece 30b at a coating amount of 20 g / m ² (thickness 50 μm), and temperature is 140 ° C. and pressure is 2 kgf / m by iron. ^2. Heat sealing was performed in 1 second.

  The resin piece 30a was fixed to the fixed clamp 34, and the end of the film piece 30b that was not bonded was fixed to the movable clamp 31, and was pulled at a test temperature of 23 ° C. with a peeling speed of 150 mm / min and a peeling distance of 40 mm. The tensile strength and fracture morphology at this time were observed.

  Furthermore, a Charpy impact test was performed on the resin piece 30a, and the relative strength of each resin piece 30a when the strength of the resin piece 30a in which no glass beads were kneaded was defined as 100 (hereinafter referred to as base material strength: resin strength mixed with inorganic filler). / Base material resin strength). A base material strength of 60% or more was marked as “good”, and a base material strength of less than 60% was marked as “non-compliant”.

  Adhesive strength of 950g or more was marked as compliant, ◯ was 900g or more and less than 950g, and Δ was marked as acceptable, and less than 900g was marked as unfit. As the failure mode, the case where the interface peeling was hardly observed by visual observation and the adhesive cohesive failure was observed was marked as “good”, and the case where partial interface peeling was observed was marked as “incompatible”. . This fracture mode was observed according to JISK6866.

  Further, before the hot melt application, the surface roughness of the surface of each resin piece 30a on which the hot melt is applied was measured. The surface roughness is “ten-point surface roughness” in the definition of surface roughness. The surface roughness was measured with a laser displacement sensor (LT9030) manufactured by Keyence Corporation.

(180 degree peeling test result)
FIG. 5 is a table summarizing the test results of the 180 degree peeling test results, and the solid line in FIG. 6 is a table plotting the test results of the 180 degree peeling test results. In the test results shown in FIG. 6, the horizontal axis represents the amount of glass beads kneaded (% by weight), the surface roughness is plotted with ▲, the adhesive strength is plotted with ◆, and the base material strength is plotted with ■. Since each parameter has a different unit system of parameters, it is displayed as reference data for the purpose of grasping the tendency representing the causal relationship.

  Specifically, for surface roughness ▲, the surface roughness of a resin piece with the most rough kneading amount of 30% is converted into standard data, and for adhesive strength, the resin piece with 30% kneading amount with the strongest bonding strength is used. The base material strength (1) was converted to standard data with a base material strength of 1 (%) as the base material strength of 1%.

(Causal relationship between kneading amount and adhesive strength)
From the table of FIG. 6, it can be seen that there is a relationship in which the surface roughness increases when the kneading amount is increased. It can also be seen that there is a relationship in which the adhesive strength increases when the kneading amount is increased. In particular, it can be seen that when the kneading amount is increased from 5% to 10%, the surface roughness is greatly increased, and the adhesive strength is greatly increased accordingly. Therefore, there is a strong causal relationship between the surface roughness and the adhesive strength, and it can be said that increasing the surface roughness increases the adhesive strength. However, the increase rate of the adhesive strength when the kneading amount is increased from 5% to 10% is significantly larger than the increase rate of the adhesive strength when the kneading amount is increased from 10% to 15%. It can be said that the relationship with the adhesive strength has an inflection point.

(Causal relationship between kneading amount and base material strength)
From the table in FIG. 6, it can be seen that the base material strength greatly decreases when the kneading amount is increased. It can also be seen that this strength drop is in a linear proportional relationship with the kneading amount.

(Optimum kneading amount based on the relationship between adhesive strength and base material strength)
Summarizing based on the above relationship, when only the adhesive strength is focused, it is preferable that the amount of kneading is larger. On the other hand, when attention is paid only to the strength which is a mechanical property, it is preferable that the kneading amount is small. Here, since the relationship between the kneading amount and the adhesive strength has an inflection point, when the kneading amount is less than 10%, the effect of improving the adhesive strength (inclination gradient) is not sufficiently obtained. Therefore, the kneading amount is preferably 10% or more, and when the kneading amount is 20% or more, the strength decreases greatly. Therefore, the preferable kneading amount is 10% or more and less than 20%, and the more preferable kneading amount is about 15%. I understand. In other words, it is effective to knead the kneading amount more than the inflection point of the increasing gradient of the adhesive force.

(Causal relationship between kneading amount and fracture mode)
7 and 8 are schematic views showing the results of observing the fracture mode. When the kneading amount exceeds 10%, as shown in FIG. 7, it can be visually judged that cracks have occurred in the hot melt (the hot melt itself is broken and peeling at the interface is not observed). The extent of destruction occupied a lot. This tendency has a relation that the range of cohesive failure increases as the kneading amount increases. On the other hand, when the kneading amount was less than 10%, as shown in FIG. 8, interfacial debonding was observed which was partially separated at the interface between the hot melt and the resin piece 30a. In particular, in the resin piece 30a having a kneading amount of 0%, there were many areas of interfacial peeling. From the above experimental results, as the amount of kneading increases, interfacial debonding is not observed and the adhesive strength is improved, so the improvement in the adhesive strength between LCP and hot melt ensures stable and sufficient adhesive strength. It has become clear that this has a causal relationship.

(Causal relationship between wettability and adhesive strength)
From the observation of the fracture mode, the adhesion between the hot melt and the LCP is important. Here, as described in the physical bonding, there is a causal relationship between the bonding strength and the wettability. In general, the wettability between glass beads and hot melt is better than the wettability between LCP and hot melt. Therefore, kneading glass beads in LCP not only improves the adhesion area based on roughening and secures the anchoring effect based on roughening, but also improves the physical adhesive force associated with improved wettability. Can do. For this reason, what has wettability higher than the wettability of a thermoplastic resin is suitable as an inorganic filler. At this time, the inorganic filler is required to be directly exposed on the surface of the adhesive surface. The inorganic filler is mechanically trapped in the thermoplastic resin, and the adhesive strength between the inorganic filler and the thermoplastic resin is not so important.

(Improvement of mechanical properties: Perspective as functionally graded material)
As described above, the higher the kneading rate of the inorganic filler, the higher the adhesion, while the deterioration of the mechanical properties becomes a problem. Therefore, the adhesive strength is ensured by increasing the dispersion density of the inorganic filler only on the adhesive surface, and deterioration of the mechanical properties is avoided by lowering the dispersion density of the inorganic filler in other portions. That is, it has a side as a functionally gradient material.

  Functionally graded materials are materials that have completely different properties as the material gradually changes from front to back. Unlike composite materials that combine multiple materials, there is no seam, the two materials are mixed inside the material, and the ratio of the materials changes from front to back without any boundary (gradient composition). In an easy-to-understand example, the surface is hard, the inside is supple and hard to break, and the blade tip has the characteristics of a Japanese sword that does not spill by leaving a large compressive stress on the blade edge.

(Drop test)
In order to verify the effect as the functionally gradient material, a drop test was performed. In this drop test, the same material (LCP, laminated film, hot melt) as that used in the 180-degree peeling test was used, using a container having the same shape as the resin container 1 shown in Example 1.

  The test container PLA molded only with LCP, the test container PLAGB1 molded with LCP having a kneading amount of glass beads 13 of 30% by weight, and the kneading amount of glass beads 13 with LCP of 30% by weight, Further, a test container PLAGB2 was prepared in which the dispersion density on the bonding surface 142 side of the drinking mouth portion 14 was increased and the dispersion density on the lower surface 141 of the drinking mouth portion was lowered.

The test container has a thickness of 1.0 mm, a height of 70 mm, a diameter of the cylindrical portion 10 on the bottom 15 side of 50 mm, a diameter of the cylindrical portion 10 on the drinking mouth 14 side of 60 mm, and an expansion of the drinking mouth 14. The diameter of the outermost diameter was set to 70 mm. The volume is about 170 cm ³ . Each of these test containers was filled with 50 g of PLA (polylactic acid) granular resin pellets, and heat sealed with a laminated film and hot melt used in the 180 ° peeling test and sealed.

  FIG. 9 is a schematic diagram showing an outline of a drop test. As shown in FIG. 9 (a), a test container filled with resin pellets was held sideways at a position of a predetermined height L from the floor (falling surface), and dropped freely from there (hereinafter referred to as a drop test). 1). Similarly, as shown in FIG. 9 (b), the test container filled with the resin pellet is held at the position of the predetermined height L from the floor so that the drinking mouth portion 14 is on the lower side, and free from there. It was dropped (hereinafter referred to as drop test 2).

The floor used for the drop test is made of concrete, and details are as follows.
1) The mass of the concrete members that make up the floor is 50 times that of the material (multilayer polyester resin).
2) The horizontal difference is 2 mm or less at any two points on the floor.
3) The floor will not deform more than 0.1mm at any point with a static load of 98N per 100mm2.
4) The floor is made of concrete and has a smooth surface that does not wrinkle the sample.

  The drop tests 1 and 2 were carried out from three different heights of 50 cm, 80 cm and 120 cm as the predetermined height L, respectively. In addition, the drop test was performed five times for each test container, and different test containers were used for the drop test 1 and the drop test 2.

  After the five drop tests, the presence or absence of cracks, chips, and deformations (hereinafter referred to as defects) in the mouthpiece 14 were observed. After performing the drop tests 1 and 2, a circle was marked when no defect was found, and a circle was marked when any one of the defects was found.

  FIG. 10 is a table summarizing the test results of the drop tests 1 and 2. From this table, no defects were observed in the test containers PLA in which the glass beads 13 were not kneaded in all drop tests. Next, defects were observed in the test container PLAGB1 when the predetermined height L was 80 cm or more. From this, it can be seen that the strength is reduced by kneading the glass beads 13.

  Next, in the test container PLAGB2, defects were observed only when the predetermined height L was 120 cm or more. In other words, no defect was observed when the predetermined height L was 80 cm. That is, it was found that the strength was improved by imparting a dispersion density, although the decrease in strength could not be denied due to the kneading of the glass beads 13.

  That is, the characteristic as a functionally gradient material can be obtained by giving the dispersion density to the glass beads kneaded with the resin. In other words, even with the same kneading amount of the glass beads, it is possible to improve the strength in addition to the improvement of the adhesion accompanying the efficient roughening of the bonding surface.

(Reflect to 180 degree peeling test result)
The dotted line in FIG. 6 is a table in which the test results are plotted when the density distribution is given with the same kneading amount. The test results shown in FIG. 6 were plotted with the horizontal axis as the kneading amount (% by weight) of the glass beads, the surface roughness as Δ, the adhesive strength as ◇, and the base material strength as □. Since each parameter has a different unit system of parameters, it is displayed as reference data for the purpose of grasping the tendency representing the causal relationship.

  With respect to the surface roughness Δ, the surface roughness of a resin piece having a kneading amount of 30%, which has the most rough surface without density distribution, was set to 1 as reference data. The adhesive strength ◇ was converted into standard data with the adhesive strength of a resin piece having a kneading amount of 30% having the highest adhesive strength without density distribution as 1. The base material strength □ was converted into standard data with a resin piece having a kneading amount of 0% having the highest base material strength (high strength) without density distribution as 1.

  From this result, even if the kneading amount of the glass beads is the same, by increasing the density distribution on the bonding surface side, the surface roughness can be improved, the accompanying adhesive strength can be improved, and the base material strength can be improved. I understand. In other words, from the viewpoint of obtaining the same adhesive force, it can be said that it can be achieved with a small glass bead kneading amount, and from the viewpoint of obtaining the same strength, it can be said that a large amount of glass bead kneading is acceptable.

(About resin container manufacturing method)
Next, the manufacturing method of the resin container 1 of Example 1 will be described. FIG. 3 is a schematic explanatory diagram showing an apparatus for manufacturing the resin container 1. As shown in FIG. 3A, the inner surface side mold 22 for molding the inner surface 12 of the container, which can raise the mold surface temperature to a value set based on a command signal from the temperature setting means 201. Have The injection mold 2 is a divided mold and has an opening / closing means (not shown).

  In the inner surface 22 of the container, a linear heating element 206 arranged to raise the temperature of the inner surface of the die, and a temperature sensor 205 capable of detecting the die surface temperature are provided. . The current control unit 202 also performs feedback control on the current value supplied from the power source 204 to the heating element 206 based on the temperature set by the temperature setting unit 201 and the mold surface temperature detected by the temperature sensor 205. In addition, a switching element 203 that connects and disconnects the electrical connection state between the power source 204 and the heating element 206 based on a control signal from the current control unit 202 is provided.

  When the target temperature is set by the temperature setting means 201, a target current value is set based on the deviation between the mold surface temperature detected by the temperature sensor 205 and the target temperature, and current is supplied to the heating element 206. Then, the heating element 206 generates heat, and the container inner surface side mold 22 is heated. Then, the current value is appropriately controlled so that the mold surface temperature becomes the target temperature.

  Further, it has a container outer surface side mold 21 that can raise the mold surface temperature to a set value based on a command signal from the temperature setting means 201 and molds the surface of the container. Similarly to the container inner surface side mold 22, the container outer surface side mold 21 is also provided with a temperature setting means 201, a current value control unit 202, a switching element 203, a power source 204, a temperature sensor 205, and a heating element 206. . The details of the control have been described above and will not be described.

  Further, it has a mouthpiece mold 25 that can raise the mold surface temperature to a value set based on a command signal from the temperature setting means 201 and molds the adhesive surface 141 that is the upper surface of the mouthpiece. A heat insulating material 26 is provided between the mouthpiece mold 25 and the container inner surface side mold 22. The mouthpiece mold 25 is also provided with a temperature setting means 201, a current value control unit 202, a switching element 203, a power source 204, a temperature sensor 205, and a heating element 206, similarly to the container inner surface mold 22. . Note that the control configuration is omitted because it has been described above.

  The thermoplastic resin can be maintained in a heated and melted state, and the molten resin kneaded with glass beads 13 that are inorganic fillers having an average particle diameter of 10 to 100 μm is used as the container inner surface side mold 22 and the container outer surface side mold 21. Injection means 23 for filling between the two.

  In the manufacturing apparatus of Example 1, the mold that forms the inner surface of the container, the mold that forms the surface of the container, and the mold that molds the drinking mouth are different molds, and the three molds are combined. The shape of the resin container 1 is formed. Moreover, it is comprised so that the temperature of each metal mold | die can be set uniquely.

  Next, the injection mold 2 opened up and down (or left and right) as shown in FIG. 3A is replaced with the container inner side mold 22 and the mouthpiece mold 25 as shown in FIG. 3B. And the container inner surface side mold 22 and the container outer surface side mold 21 are combined to close the injection mold 2 to form a space 24 in the shape of the resin container 1. The temperature setting means 201 sets the container inner surface side mold 22 to 110 ° C. (first predetermined temperature), and sets the container outer surface side mold 21 to 50 ° C. (second predetermined temperature lower than the first predetermined temperature). ) And the mouthpiece mold 25 is set to 35 ° C. (a third predetermined temperature lower than the second predetermined temperature). Then, the surface temperature of the container inner surface side mold 22 is increased to 110 ° C., the surface temperature of the container outer surface side mold 21 is increased to 50 ° C., and the surface temperature of the mouthpiece mold 25 is increased to 35 ° C. Then, after the temperature is raised, the molten resin is filled into the space 24 by the injection means 23 in a state where the temperature is maintained, and the container is molded into a container having a predetermined shape. When the injection mold 2 is opened after the injection molding as described above and the hollow container is cooled, the resin container 1 molded into a predetermined shape is taken out.

  As a result, the spout part 14 has a higher dispersion density than the container inner surface 12 side and the container outer surface 11 side of the cylindrical part 10 and the bottom part 15, roughens the bonding surface 142, and the spout part lower surface 141 and the spout part end face Glass beads are exposed on the surface of 143. Thereby, the improvement of adhesive force and the improvement of an intensity | strength can be aimed at. In addition, even when the consumer drinks the contents by bringing the lips into contact with the lower surface 141 and the end surface 143 of the drinking mouth, the heat insulating property of the drinking mouth 14 is ensured. In addition, the contact area between the lips and the outer surface 11 of the container, the lower surface 141 of the drinking mouth, and the end surface 143 of the drinking mouth is reduced, or much between the lip and the outer surface 11 of the container, the lower surface 141 of the drinking mouth, and the end surface 143 of the drinking mouth. An air layer is provided so that the heat of the contents of the container is less likely to be transmitted.

(Contrast with general injection molding technology)
Generally, the temperature of both molds at the time of injection molding is raised to a temperature that can ensure the fluidity of the resin in order to make the density distribution uniform. For example, the temperature of both the container inner surface side mold 22 and the container outer surface side mold 21 is raised to 110 ° C. For this reason, there is no anisotropy in the fluidity | liquidity of the inorganic filler in a metal mold | die, and an inorganic filler density is distributed equally.

  Here, the resin container 1 of Example 1 is compared with a resin container containing a normal inorganic filler (average particle diameter of 10 to 100 μm) whose both mold temperatures are raised to the same level. FIG. 11 is an enlarged cross-sectional view of a normal inorganic filler-containing resin container (hereinafter, comparative example). For comparison, the same wall thickness of 1.0 mm as in Example 1 was used, the same glass beads 13 as in Example 1 were used as the inorganic filler, and the content was kneaded by 15% at the same weight ratio as in Example 1.

  As shown in FIG. 11, in the comparative example, the dispersion density of the glass beads 13 on the container inner surface 12 side of the resin container 1 and the dispersion density of the glass beads 13 on the container outer surface 11 side are almost uniformly distributed. In other words, in the fluidity of the glass beads 13, there is no particular anisotropy between the container inner surface 12 side and the container outer surface 11 side.

The surface roughness of the comparative example is
External surface roughness (Rz): 10.20μm
Inner surface roughness (Rz): 10.20μm
Both surfaces have the same surface roughness, and are equal to or slightly smoothed to the inner surface side surface roughness of Example 1.

  In this case, since the dispersion density of the adhesive surface 142 is not so high, a sufficient adhesive force cannot be ensured. In addition, since the roughness on the adhesive surface 141 and the container outer surface 11 is low, when the consumer grips or drinks the contents by bringing the lip into contact with the drinking mouth part 14, the contact area with the skin surface is large and heat is applied. Easy to convey.

  On the other hand, in the manufacturing method of Example 1, the temperature of the container inner surface side mold 22 is increased to ensure the fluidity of the resin, while the temperature of the container outer surface side mold 21 is decreased to reduce the resin. Reduce the fluidity of Then, the temperature of the mouthpiece mold 25 is further lowered to further reduce the fluidity of the resin. Once the glass beads 13 kneaded in the molten resin are brought into contact with the surfaces of the container outer surface mold 21 and the mouthpiece mold 25 having a low temperature, the glass beads 13 are difficult to flow. When this phenomenon is repeated, the dispersion density of the glass beads 13 becomes low in the container inner surface side mold 22 having high fluidity, whereas the dispersion density of the glass beads 13 is increased in the container outer surface side mold 21 having low fluidity. . In this tendency, the lower the temperature, the more remarkable the decrease in fluidity, and the more the improvement in dispersion density becomes.

  By the above action, it becomes possible to have density distributions with different dispersion densities among the inner surface 12, the outer surface 11, and the bonding surface 141, and the bonding surface 141 is bonded by roughening and exposing the glass beads 13. Ensuring the improvement of force and ensuring sufficient heat insulation in places where the customer directly touches like the outer surface 11 of the container, while reducing the density of the glass beads 13 on the inner surface side of the container, The physical properties can be secured.

(About superiority of manufacturing cost)
Next, the superiority of the manufacturing cost will be described. Conventionally, a technique described in Japanese Patent Application Laid-Open No. 2006-327650 is known as a technique of a resin molded product having an adhesive surface. According to this publication, when heat sealing is performed using a hot-melt type adhesive, the upper surface of the flange serving as the bonding surface is subjected to a roughening process to form fine irregularities to obtain a sealing strength. However, with the above technique, although a slight improvement in adhesion can be expected, after forming the container, a thermal crystallization treatment must be performed separately using a porous metal material, which complicates the manufacturing process. was there. Furthermore, it only has unevenness on the resin to the last, and although the throwing effect and slight wettability improvement associated with the unevenness can be expected, it essentially solves the wettability between LCP and hot melt. It is not a thing.

  On the other hand, in the manufacturing method described in Example 1, the adhesion surface can be roughened only by kneading the inorganic filler in the molten resin. In addition, by simply changing the set temperature of the mold, the glass beads can be efficiently exposed on the adhesive surface, and the glass beads have good wettability with respect to hot melt. In addition, the physical adhesive force accompanying the further improvement of wettability can be improved. At the same time, by increasing the dispersion density of the adhesive surface and decreasing the dispersion density of the other portions, a gradient composition can be obtained and the strength can be improved.

  Next, it compares with a prior art from a heat insulating viewpoint. As a container having heat insulation properties, for example, a technique described in Japanese Patent Application Laid-Open No. 2004-26227 is known. In this publication, a foamable resin layer is formed on the outer surface of the container to provide a heat insulating effect. However, when such a resin is used in a resin container, in order to obtain a sufficient heat insulating effect, a process of adding hollow fine particles to the resin and a process of using a resin film are necessary, and the manufacturing cost Is lacking in practicality.

  A technique described in JP-A-2001-270571 is also known. In this publication, a tuning ink that synchronizes with foaming is applied to the outer surface of a resin container, the component composition of the tuning ink is specified, and the thickness of each member constituting the container body member is specified to determine the container weight. It has heat insulation while suppressing However, the process of applying the foamed ink is necessary, and the manufacturing cost increases, so that it is not practical.

  In addition, as shown in Utility Model Registration No. 3119185, JP-A-6-321265, JP-A-2007-176504, JP-A-2000-168853, a technology for providing ribs and uneven embossing on the outer surface of the body, Etc. are disclosed. However, when a resin container is formed using these techniques, there is a problem that the amount of resin increases and the container cannot be thinned, a problem that the molding defect rate increases because a fine shape is processed, and the container In addition, it is necessary to manufacture a mold for having a complicated and fine shape, and there is a problem that the manufacturing cost increases, both of which lack practicality.

  On the other hand, in the manufacturing method of Example 1, since anisotropy of the distribution density distribution can be obtained only by maintaining the two mold temperatures at the time of injection molding at different temperatures, a plurality of manufacturing steps are performed. In this way, the manufacturing cost can be reduced.

(Superior surface roughness)
Moreover, when the temperature of the container inner surface side mold 22 is set to 110 ° C. and the temperature of the container outer surface side mold 21 is maintained at 50 ° C. as in the first embodiment, as illustrated in the enlarged sectional view of FIG. The surface roughness of itself can be made rougher than the inner surface 12 of the container. As described above, the container outer surface 11 is a portion that is directly touched by a consumer, and reduces the contact area between the skin surface and the container outer surface 11, or provides many air layers between the skin surface and the container outer surface 11. Thus, it is possible to make it difficult to transmit the heat of the container contents.

  The temperature difference when the container outer surface side mold 21 is made lower than the container inner surface side mold 22 may be set as appropriate depending on the characteristics of the thermoplastic resin material and the characteristics of the inorganic filler to be kneaded. It is considered that the higher the density, the stronger the anisotropy of the density distribution and the rougher the surface roughness of the outer surface 11 of the container.

  In Example 1, the inner surface 12 of the container has a low density of the glass beads 13 and the smoothness of the inner surface 12 of the container is increased. Thereby, it becomes difficult for the container contents to adhere to the container inner surface 12, and a good state can be maintained in terms of hygiene and design.

  As described above, the effects listed below can be obtained in the first embodiment.

(1) A resin molded product (resin container 1) having an adhesive surface (142) to which a member to be bonded (laminated film 3) is attached via an adhesive (hot melt 4), which is made of resin (LCP) The inorganic filler (glass beads 13) having an average particle size of 10 to 100 μm was kneaded in an amount of 10 to 20% by weight so that the surface roughness of the adhesive surface (142) was rougher than when the adhesive surface (142) was molded with resin alone. In other words, it is possible to form irregularities on the bonding surface simply by kneading the inorganic filler, and apply 20 to 40 g / m ² (thickness 50 to 100 μm) of adhesive in the concave portion to flatten the outermost surface of the bonding. A lid (a member to be bonded) is attached.
Therefore, the adhesiveness can be easily improved without complicating the manufacturing process. Further, when the opening is sealed with a laminated film as a packaging container, the sealing property can be secured.

  (2) The inorganic filler has a higher adhesion to the adhesive than the resin and is exposed on the surface of the adhesive surface. Therefore, kneading the inorganic filler in the resin can improve the adhesion area based on the roughening, the anchoring effect based on the roughening, and also improve the physical adhesive force accompanying the improvement of wettability. .

  (3) The inorganic filler is a hollow glass bead. Therefore, it is possible to reduce the weight of the resin molded product, improve the durability against impact, reduce the transportation cost, and reduce the environmental load. Moreover, since glass beads are excellent in heat insulation properties, they are more suitable when applied to places where heat insulation is necessary.

  (4) The dispersion density, which is the number of inorganic fillers (glass beads 13) contained in the unit volume of the resin molded product (resin container 1), has a density distribution that increases as it approaches the bonding surface (142). did. That is, if the kneading amount of the inorganic filler is increased to ensure the roughness of the adhesive surface, the mechanical properties are deteriorated. Therefore, by increasing the density distribution of the bonding surface and improving the bonding strength, and reducing the density distribution at other locations, it is possible to achieve both the securing of the backing force and the strength.

  (5) The resin molded product (resin container 1) has a density distribution in the thickness direction of the bonding surface (142). Now, when considering a plate-like material, if the density distribution is increased only in the area corresponding to the bonding surface and the density distribution in the other areas is decreased, stress concentration is likely to occur in the bonding surface area, and it tends to break. End up. On the other hand, a gradient composition can be obtained by having a density distribution in the thickness direction of the bonding surface portion, and strength can be ensured without stress concentration.

  (6) A resin molded product is an integrally molded container having a main body portion (cylindrical portion 10, bottom portion 15) and an opening portion (a mouthpiece portion 14) filled with contents, and an opening portion (a mouthpiece). The part 14) has an adhesive surface. The container filled with the contents closes the opening with a film having a high gas barrier property in consideration of hygiene and transportability. At this time, when the bonding surface becomes the drinking mouth part 14 or the like, it is common to use a chemically inert hot melt as an adhesive and bond the film to the bonding surface. At this time, if the distribution density of the inorganic filler is increased on the bonding surface of the opening, in addition to improving the adhesive force, the heat insulation can be increased. For example, when the hot contents are directly taken with the lips attached to the mouth portion 14, the lower surface 141 of the mouth portion, the end surface 143 of the mouth portion, and the outer surface 11 of the container are roughened, so that the contact area with the lips is increased. Or a lot of air layers can be provided between the lip surface and the lower surface 141 of the mouthpiece, the end surface 143 of the mouthpiece, and the outer surface 11 of the container, thereby making it difficult to transfer the heat of the contents of the container. it can.

  (7) The dispersion density, which is the number of inorganic fillers contained in the unit volume of the main body part (cylindrical part 10), is closer to the main body part outer surface side (container outer surface 11 side) than the main body part inner surface side (container inner surface 12 side). It was decided to have a density distribution that became higher. That is, the container outer surface 11 is a portion that is directly touched by a customer, and reduces the contact area between the skin surface and the container outer surface 11 or by providing a large air layer between the skin surface and the container outer surface 11. This can make it difficult to convey the heat of the contents of the container.

  (8) Adhesive surface on which the surface temperature of the contact surface in contact with the object to be molded (resin container 1) can be raised to the first predetermined temperature (35 ° C.) and the member to be bonded is attached via an adhesive The surface temperature of the contact surface molding means (tapping part mold 25) that molds and the contact surface in contact with the molding object is set to a second predetermined temperature (110 ° C. or 50 ° C.) higher than the first predetermined temperature. Using the molding means (the container outer surface side mold 21 and the container inner surface side mold 22) that can raise the temperature and molds other than the bonding surface, the molten resin kneaded with the inorganic filler is bonded to the bonding surface molding means (a mouthpiece). Part mold 25) and a molding means (a container outer surface side mold 21 and a container inner surface side mold 22). The second predetermined temperature was set to a temperature at which the adhesive surface becomes rougher than other than the adhesive surface.

  Therefore, the adhesiveness can be ensured by roughening the adhesive surface, while the mechanical properties of the container can be ensured by reducing the density of the inorganic filler other than the adhesive surface. Further, since the density distribution anisotropy (gradient composition) can be obtained simply by raising the molding means and the adhesive surface molding means to different temperatures, the manufacturing cost is suppressed without going through a plurality of manufacturing steps. be able to.

  Further, the first predetermined temperature (35 ° C.) and the second predetermined temperature (110 ° C. or 50 ° C.) are raised to a temperature at which the bonding surface 142 becomes rougher than the inner surface 12 or the outer surface 11 of the container. Therefore, the bonding surface 142 can be reliably roughened.

  In addition, like Example 1, the container outer surface side mold 21, the container inner surface side mold 22, and the drinking mouth part mold 25 are provided, and these temperatures can be raised independently, so The required dispersion density can be freely adjusted. Therefore, the inner surface 12 of the container maintains smoothness, the outer surface 11 of the container increases the dispersion density from the viewpoint of heat insulation, and the outer surface of the drinking mouth part 14 from the viewpoint of improving the adhesive strength. The dispersion density can be increased to 11 or more. Thereby, the improvement of adhesive force, the improvement of heat insulation, and the improvement of intensity | strength can all be achieved.

  (9) The first predetermined temperature and the second predetermined temperature are temperatures at which an inorganic filler having high adhesive strength is exposed on the surface of the bonding surface. Thereby, in the adhesive surface, the adhesive force is improved by the exposure of the inorganic filler, and on the other hand, the mechanical properties of the container can be ensured by lowering the density of the inorganic filler in other than the adhesive surface. Moreover, since the anisotropy of the density distribution can be obtained only by raising the temperature of the forming means and the adhesive surface forming means to different temperatures, the manufacturing cost can be suppressed without going through a plurality of manufacturing steps.

  As described above, the first embodiment has been described. However, the present invention is not limited to the above configuration, and the design may be changed as appropriate without departing from the scope of the present invention. For example, in Example 1, LCP was used as the thermoplastic resin, but other exemplified thermoplastic resins and combinations thereof may be used.

  Moreover, although the hollow glass bead 13 was used as an inorganic filler, it is good also as a structure which gives a density distribution using another inorganic filler, and it is good also as a structure which gives a density distribution combining several inorganic fillers.

  In the first embodiment, the container inner surface side mold 22 and the container outer surface side mold 21 are configured as separate molds. However, a configuration in which one container includes the container inner surface side and the container surface side may be employed. In this case, it should be noted that even a single mold needs to be a mold capable of raising the temperature to a value set with a different temperature distribution.

  Moreover, in Example 1, although the temperature of the container inner surface side mold | type 22 and the drinking mouth part mold | type 25 was set to 110 degreeC and 35 degreeC, respectively, it is not restricted to this, The temperature difference from which required density distribution is obtained Should be set.

  Moreover, in Example 1, since the temperature of the container outer surface side mold 21 was raised to a low value, the anisotropy of the density distribution was given to all the container outer surfaces 11, but, for example, a cylindrical part that becomes a gripping part of the container Alternatively, the temperature may be lowered only in a part of the cylindrical part, and the density distribution may be anisotropic only in this part.

  In Example 1, the temperature of the mouthpiece mold 25 is raised to 35 ° C. and the container outer surface side mold 21 is raised to 50 ° C. For example, the temperature of the mouthpiece mold 25 is further increased. The temperature of the bonding surface 142 may be further increased by raising the temperature to a low temperature (for example, 25 ° C.).

  Alternatively, the temperature of the mouthpiece mold 25 is raised to, for example, about 50 ° C., which is higher than the temperature rise temperature of the container outer surface side mold 21, and the dispersion density of the glass beads 13 in the mouthpiece 14 is increased. May be appropriately adjusted so as not to be excessively high. Thereby, the mechanical property of the drinking mouth part 14 can be improved.

  In the first embodiment, the mouthpiece mold 25 is configured to come into contact with the adhesive surface 142. For example, the mouthpiece mold 25 may be configured to cover the entire mouth section surface 140. In this case, it becomes possible to raise only the drinking part 14 to an independent temperature, and the dispersion density and surface roughness in the drinking part 14 can be freely set.

  In addition, in Example 1, although the example applied to the resin container was shown, for example, in the case of a resin container lid having a drinking mouth portion, the present invention is applied to the container lid and the adhesiveness or It is good also as a structure which ensures heat insulation.

  Further, in Example 1, the dispersion density was made anisotropic by raising the temperature of the mold during injection molding to two different temperatures. For example, an electric field or magnetic field was applied around the mold during injection molding. It is also possible to use a method of applying an anisotropy to the dispersion density by using this field force.

  Specifically, a paramagnetic material or a ferromagnetic material is employed as the inorganic filler, and by applying a magnetic field between the mouthpiece mold 25 and the container inner surface side mold 22 and the container outer surface side mold 21, You may make it make it easy for inorganic fillers to gather on the mouthpiece mold 25 side.

  Alternatively, ionized particles having a specific gravity different from that of the inorganic filler are mixed in the molten resin, and an electric field is applied between the mouthpiece mold 25 and the container inner surface mold 22 and the container outer surface mold 21. Thus, the ionized particles are easily collected in the mouthpiece mold 25. Thereby, you may make it easy to gather the inorganic filler from which specific gravity differs on the drinking mouth part metal mold | die 25 side.

  Moreover, in Example 1, although the adhesive surface was shape | molded in the drinking mouth part of the container, not only a drinking mouth part but an adhesion surface is shape | molded in the outer periphery of a cylindrical part, or the lower surface of a bottom part, and adhesives, such as a hot melt, are used. A film or a product tag on which a product name or the like is written may be bonded. Alternatively, an adhesive surface may be formed on the inner surface of the container, and a film or the like may be bonded to the inner surface of the container.

  In this case, the injection molding of the molten resin is not limited as in the first embodiment, and the resin container may be made by other molding means. That is, in Example 1, the container inner surface side mold is used as the container inner surface side molding means, and the container outer surface side mold is used as the container outer surface side molding means. However, the present invention is not limited to the mold, and an extrusion molding roller is molded. It may be used as

  For example, when a resin is processed into a sheet shape by extrusion molding, and this sheet-shaped resin is processed into a container shape by vacuum forming or blow molding, the sheet-shaped resin has a surface that becomes the container inner surface and a back surface that becomes the container outer surface. Will have. Extrusion molding is a process in which a molten resin is extruded between two rollers to form a sheet having a desired thickness. At this time, the roller for forming the surface of the sheet-like resin is heated to the first predetermined temperature, and the roller for forming the back surface of the sheet-like resin is raised to the second predetermined temperature lower than the first predetermined temperature. In the heated state, a molten resin kneaded with an inorganic filler is interposed.

  Then, distribution can be given so that the dispersion density differs in the thickness direction between the front surface and the back surface of the sheet-like resin formed by extrusion molding. When this sheet-like resin is bulged from the front surface to the back surface side by vacuum molding or blow molding and processed into a container shape, the front surface becomes the inner surface of the container and the rear surface becomes the outer surface of the container (the reverse relationship may be used).

  Thereby, it goes without saying that even in this manufacturing method, the same effects can be obtained by combining with the components described in the first embodiment.

  Moreover, in Example 1, although the film was adhere | attached on the adhesive surface of the thermoplastic resin via hot melt, it is effective also when bonding thermoplastic resins. Further, the present invention is not limited to containers, but is effective when an inorganic filler is kneaded in a thermoplastic resin for packaging electronic components and the like, and a product tag or the like is adhered to the electronic components. In this case, the heat resistance can be improved and the weight can be reduced by using glass beads at the same time.

  Moreover, in Example 1, although the surface of the adhesive surface was roughened and the inorganic filler with high adhesive force was exposed and the adhesive force was improved by both, the desired adhesive force was obtained. If it is a range, it is good also as a structure which achieves only either one. That is, the inorganic filler is exposed on the surface of the adhesive surface, but the surface is not roughened and may be in a smoothed state. This smoothing may be achieved by the mold temperature or the shape of the inorganic filler to be kneaded, or after molding, only the adhesive surface may be polished to smooth the surface.

1 is a perspective view of a resin container of Example 1. FIG. 3 is a partially enlarged cross-sectional view of a region A of a resin container of Example 1. FIG. 2 is a schematic explanatory diagram illustrating a resin container manufacturing apparatus according to Embodiment 1. FIG. It is the schematic of the tension test machine which measures adhesive force. It is the table | surface which put together the test result of the 180 degree | times peeling test result. It is the table | surface which plotted the 180 degree peeling test result. It is a schematic diagram showing the result of having observed the fracture form after a 180 degree | times peeling test. It is a schematic diagram showing the result of having observed the fracture form after a 180 degree | times peeling test. It is a schematic diagram showing the outline | summary of a drop test. It is the table | surface which put together the test result of the drop test. It is an expanded sectional view of a comparative example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Resin container 2 Injection mold 10 Cylindrical part 11 Container outer surface 12 Container inner surface 13 Glass bead (inorganic filler)
14 Drinking mouth part 15 Bottom part 21 Container outer surface side mold 22 Container inner surface side mold 23 Injection means 24 Space 25 Drinking part mold 26 Thermal insulation
201 Temperature setting means
202 Current control unit
203 Switching element
204 power supply
205 Temperature sensor
206 Heating element

Claims (19)

A resin molded product having an adhesive surface to which a member to be bonded is attached via an adhesive,
A resin molded product, wherein an inorganic filler having an average particle size of 10 to 100 μm is kneaded into a resin so that the surface roughness of the adhesive surface is rougher than when the surface of the adhesive surface is molded only with the resin. A resin molded product having an adhesive surface to which a member to be bonded is attached via an adhesive,
A resin molded product obtained by kneading an inorganic filler having an average particle size of 10 to 100 μm, which has a higher adhesion to the adhesive than the resin, and exposing the inorganic filler on the surface of the adhesive surface . A resin molded product having an adhesive surface to which a member to be bonded is attached via an adhesive,
Kneading the resin with an inorganic filler having an average particle size of 10 to 100 μm, which has a higher adhesion to the adhesive than the resin, such that the surface roughness of the adhesive surface is rougher than that formed by the resin alone, and A resin molded product, wherein the inorganic filler is exposed on the surface of the adhesive surface. In the resin molded product according to any one of claims 1 to 3,
The resin-molded product, wherein the inorganic filler is a hollow glass bead. In the resin molded product according to any one of claims 1 to 4,
A resin molded product having a density distribution in which a dispersion density, which is the number of the inorganic fillers contained in a unit volume of the resin molded product, is higher as it is closer to the adhesive surface. In the resin molded product according to claim 5,
The resin molded product, wherein the resin molded product has the density distribution in a thickness direction of the bonding surface portion. In the resin molded product according to any one of claims 1 to 6,
The resin molded product is an integrally molded container having a main body and an opening filled with contents,
A resin molded product having an adhesive surface in the opening. In the resin molded product according to claim 7,
The resin molded product having a density distribution in which a dispersion density, which is the number of the inorganic fillers contained in a unit volume of the main body, is higher as it is closer to the outer surface of the main body than to the inner surface of the main body. . An adhesive surface forming means for forming an adhesive surface to which a member to be bonded can be attached via an adhesive, wherein the surface temperature of the contact surface in contact with the object to be molded can be increased to a first predetermined temperature;
A molding means capable of raising the surface temperature of the contact surface in contact with the molding object to a second predetermined temperature higher than the first predetermined temperature, and molding other than the adhesive surface;
Use
A method for molding a resin molded product in which a molten resin kneaded with an inorganic filler is interposed between the adhesive surface molding means and the molding means,
The first predetermined temperature and the second predetermined temperature are temperatures at which the bonding surface becomes rougher than other than the bonding surface. An adhesive surface forming means for forming an adhesive surface to which a member to be bonded can be attached via an adhesive, wherein the surface temperature of the contact surface in contact with the object to be molded can be increased to a first predetermined temperature;
A molding means capable of raising the surface temperature of the contact surface in contact with the molding object to a second predetermined temperature higher than the first predetermined temperature, and molding other than the adhesive surface;
Use
A molding method for a resin molded product, in which a molten resin kneaded with an inorganic filler having a higher adhesive force than the resin is interposed between the adhesive surface molding means and the molding means,
The method for molding a resin molded product, wherein the first predetermined temperature and the second predetermined temperature are temperatures at which the inorganic filler is exposed on a surface of the adhesive surface. An adhesive surface forming means for forming an adhesive surface to which a member to be bonded can be attached via an adhesive, wherein the surface temperature of the contact surface in contact with the object to be molded can be increased to a first predetermined temperature;
A molding means capable of raising the surface temperature of the contact surface in contact with the molding object to a second predetermined temperature higher than the first predetermined temperature, and molding other than the adhesive surface;
Use
A molding method for a resin molded product, in which a molten resin kneaded with an inorganic filler having a higher adhesive force than the resin is interposed between the adhesive surface molding means and the molding means,
The first predetermined temperature and the second predetermined temperature are temperatures at which the inorganic filler is exposed on the surface of the bonding surface, and the bonding surface becomes rougher than other than the bonding surface. Molding method for resin molding. In the molding method of the resin molded product according to any one of claims 9 to 11,
The method for molding a resin molded product, wherein the inorganic filler is a hollow glass bead. In the molding method of the resin molded product according to any one of claims 9 to 13,
A method for molding a resin molded product, wherein the dispersion density, which is the number of the inorganic fillers contained in a unit volume of the resin molded product, has a density distribution that becomes higher as it is closer to the adhesive surface. In the molding method of the resin molded product according to claim 13,
The method for molding a resin molded product, wherein the resin molded product has the density distribution in a thickness direction of the bonding surface portion. In the molding method of the resin molded product according to any one of claims 9 to 14,
The resin molded product is an integrally molded container having a main body and an opening filled with contents,
A method for molding a resin molded product, wherein the opening has an adhesive surface. In the molding method of the resin molded product according to claim 15,
The resin molded product having a density distribution in which a dispersion density, which is the number of the inorganic fillers contained in a unit volume of the main body, is higher as it is closer to the outer surface of the main body than to the inner surface of the main body. Molding method. A resin container made of resin, having an adhesive surface in the opening, and kneaded with an inorganic filler having an average particle size of 10 to 100 μm so that the surface roughness of the adhesive surface becomes rougher than that formed by the resin alone When,
A laminated film that seals the opening;
With
A packaging container, wherein the adhesive surface and the laminated film are bonded together with an adhesive and sealed with the adhesive. An inorganic filler having an average particle size of 10 to 100 μm, which is made of a resin and has an adhesive surface in the opening and has higher adhesive strength to the adhesive than the resin, exposes the inorganic filler on the surface of the adhesive surface. A plastic container,
A laminated film that seals the opening;
With
A packaging container, wherein the adhesive surface and the laminated film are bonded together with an adhesive and sealed with the adhesive. Kneaded inorganic filler having an average particle size of 10 to 100 μm so as to be made of resin, having an adhesive surface in the opening, and having a surface roughness of the adhesive surface that is rougher than that formed by the resin alone; A resin container in which the inorganic filler is exposed on the surface of the adhesive surface;
A laminated film that seals the opening;
With
A packaging container, wherein the adhesive surface and the laminated film are bonded together with an adhesive and sealed with the adhesive.

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