JP4975859B2 - Method for manufacturing roll-on container - Google Patents

Description

  The present invention is a method for manufacturing a roll-on container in which an inner stopper that rotatably fits and holds a ball is disposed at a container mouth, and contents such as cosmetics are distributed on the surface of the ball and applied to a desired site. In particular, the present invention relates to a method for assembling a roll-on container to a ball stopper.

  Conventionally, a roll-on container that has a ball stopper that fits and holds the ball at the mouth of the container, distributes the contents to the surface of the ball, and applies it to the desired site. It is widely used as a container that can easily apply an object. When using a roll-on container, bring the ball into contact with the skin that will be the application site, lift the container body upwards, bring the contents into contact with the ball, and roll the ball on the skin. Distribute things.

  Thus, the contents are applied onto the skin through the gap between the ball and the inner peripheral surface of the inner plug, but the gap between the ball and the inner peripheral surface of the inner plug is used to reduce the rolling friction of the ball. The container side is widened, and the mouth end of the inner plug is narrowed. Therefore, the amount of the content applied is almost determined by the gap between the ball and the end of the inner end of the inner stopper opening. It is necessary to design carefully so that it does not fall.

  However, when the ball and the inner plug are actually mass-produced, variations occur in the molding. Therefore, when the ball is assembled to the inner plug, the gap between the ball and the inner plug mouth end is large. In addition, such a variation in dimensions due to mass production is not only a problem of usability such as the contents being difficult to get out or coming out too much, but also a problem such as the contents dripping or flowing out when the gap is large. May lead to

  The amount of content applied by the roll-on container can be adjusted to some extent by adjusting the viscosity by adding a thickener or the like to the content and changing the ease of flow of the content, but as described above It was difficult to cope with variations in the coating amount of individual products generated by mass production.

JP 2004-222860 A JP 2002-240847 A

  The present invention adjusts the gap between the ball and the inner end of the inner end of the inner end of the roll-on container in the roll-on container manufacturing process by adjusting the variation in the application amount of the roll-on container due to the variation in the dimensions of the ball and the inner plug generated in the mass production process. It is an object of the present invention to provide a method for producing a roll-on container that can be eliminated by making the coating amount constant.

  As a result of studies by the present inventor in order to solve the above-mentioned problems, the ball is temporarily fitted to the front end of the mouth of the inner plug, and in this state, in an atmosphere at a temperature higher than the softening point of the synthetic resin constituting the inner plug Hold and expand the tip of the inner plug to match the size of the ball, stabilize it, and then push the ball further into the inner plug so that the ball is completely fitted into the inner plug and assembled. It is found that the gap between the front end of the stopper opening can be made constant, thereby eliminating the variation in the amount of application of the roll-on container caused by the variation between the inner stopper and the ball, and making the amount of application constant. It came to complete.

That is, the present invention is a method for manufacturing a roll-on container having an inner plug that rotatably fits and holds a ball at the container mouth portion, the first fitting step of fitting the ball into the mouth end of the inner plug, An expansion stabilization process that expands and stabilizes the inner diameter of the mouth end of the inner end of the stopper in the atmosphere at a temperature higher than the softening point of the synthetic resin constituting the ball, and then stabilizes the ball. pushing the stopper, the second fitting process and, by fitting engagement of the ball on the inside cap through the roll container manufacturing method characterized by assembling the inner plug a ball entering completely fitted to the inner plug of the ball is there.

  Furthermore, the present invention is such that the ball is made of a synthetic resin, and the ball is fitted into the tip of the mouth end of the inner plug, and between the softening point of the synthetic resin constituting the ball and the softening point of the synthetic resin constituting the inner plug. The inner diameter of the mouth end of the inner end of the inner stopper is expanded and stabilized in the atmosphere at the temperature of the inner stopper, and then the ball is pushed into the inner stopper to fully fit the ball into the inner stopper. A method for manufacturing a roll-on container, wherein the ball is assembled to the inner stopper by

  Furthermore, the present invention provides the method for producing a roll-on container, wherein the synthetic resin constituting the inner plug is low-density polyethylene.

  Furthermore, the present invention provides the method for producing a roll-on container, wherein the synthetic resin constituting the ball is polypropylene.

  Furthermore, the present invention is the method for producing a roll-on container, wherein the softening point of the low density polyethylene constituting the inner plug is 75 to 90 ° C.

  Furthermore, the present invention is the method for producing a roll-on container, wherein the softening point of polypropylene constituting the ball is 95 to 130 ° C.

The present invention, in the second fitting process, after cooling, push the inner plug a ball is a method for producing a roll-on container, characterized in Rukoto to be input completely fitted to the inner plug of the ball.

  Moreover, this invention is manufactured by the manufacturing method of the said roll-on container, It is a roll-on container characterized by the above-mentioned.

  According to the roll-on-container manufacturing method of the present invention, the mouth end of the inner plug is expanded according to the size of the ball, and the gap between the ball and the inner plug mouth end is adjusted to a predetermined interval. The variation in coating amount caused by the variation in molding between the ball and the inner stopper is eliminated, and a roll-on container having a constant coating amount can be manufactured.

  In addition, when it is necessary to increase the amount of application, the clearance between the ball and the inner end of the inner end is simply widened to a predetermined interval while eliminating the variation between the ball and the inner end, and the application amount can be increased stably. Is possible.

Perspective view (partial cross section) of roll-on container Cross section of roll-on container Expanded cross-sectional view of roll-on container ball and stopper A-A line sectional view The figure which shows the manufacturing method of the roll-on container concerning this invention

  FIG. 2 shows a cross-sectional view of the roll-on container. An inner stopper (3) is placed at the mouth of the container body (1). The inner plug (3) holds the ball rotatably on the inner peripheral surface (7).

  When using the roll-on container, the container (1) is lifted upward while bringing the ball (2) into contact with the skin to be applied, and the contents contained in the container body (1) are transferred to the flow path (8). The ball (2) is brought into contact with the ball (2) and the ball (2) is rolled on the skin to distribute the contents to the surface of the ball and apply it onto the skin through the gap between the ball surface and the inner peripheral surface of the inner plug. To.

  The diameter of the ball (2) is designed to be a size suitable for application to a desired site as a roll-on container. The width to be applied at one time depends on the size of the ball, and the diameter of the ball (2) is preferably 5 to 40 mm, more preferably 7 to 35 mm in consideration of the width of the application surface when applied to the human skin.

  In order to bring the contents contained in the container body (1) into uniform contact with the ball surface regardless of the rotation direction of the ball (2), the cross-section of the flow path (8) of the inner plug is usually circular, but the shape of the container It is possible to make various shapes corresponding to the above, and the shape is not limited to this as long as the basic shape is a circle, an ellipse, and a similar shape.

  After use, the cap (4) is screwed onto the container body (1) and attached. On the inner surface of the cap (4), a pressing rib (6) is vertically suspended. When the cap (4) is screwed into the container body (1), the ball (2) is sealed by the pressing rib (6). 5) and the flow path (8) is closed. Thereby, the contents in the container body (1) can be blocked from contact with the outside air, and the quality can be maintained (FIG. 2).

  FIG. 4 is a cross-sectional view taken along line AA. R represents the radius of the mouth of the inner end (10) of the inner plug (3), and r represents the radius of the cross section of the ball (2). In general, when the inner plug (3) and the ball (2) are obtained by injection molding using a synthetic resin, R due to mass production is about ± 0.05 mm for R and about ± 0.05 mm for r. . The clearance (9) between the inner plug (3) and the ball (2) needs to be at least 0.05 mm so that the ball (2) rotates smoothly and feeds out the contents. Therefore, the gap (9) is set to 0 so that the gap (9) can be maintained at 0.05 mm even when the inner plug having the smallest mouth radius R and the rotating ball having the largest cross-sectional radius r are combined due to variation in molding. Designed as 15 mm, conversely, when the smallest ball and the largest inner plug are combined, the gap (9) is 0.25 mm.

  Thus, since the variation of the gap (9) is large, the variation of the coating amount is large in each roll-on container.

  The roll-on container manufacturing method of the present invention solves the problem of unstable coating amount caused by variation in mass production of the ball (2) and the inner plug (3) by the manufacturing process of the roll-on container.

  FIG. 5 is a schematic view showing a method for producing a roll-on container according to the present invention. The ball (2) is inserted into the mouth end (10) of the inner plug (3) (step (a)) to be in a temporarily fitted state (step (b)). In this state, it is held in an atmosphere at a temperature higher than the softening point of the synthetic resin constituting the inner plug (step (c)). By holding in an atmosphere at a temperature higher than the softening point of the synthetic resin, the mouth end (10) of the inner end of the inner plug is expanded and stabilized to the size of each ball to be set. Next, after cooling to a temperature lower than the softening point, the ball is further pushed into the inner plug (step (d)), and the ball is completely fitted into the inner plug (step (e)). Finally, the set product of the ball and the inner stopper is fitted into a container filled with the contents (step (e)) to obtain a finished product (step (f)). By passing through such a process, the tip end portion (10) of the inner end of the inner plug is expanded in accordance with the size of each ball, so that the gap between the ball and the inner plug can be made constant. And it becomes possible to eliminate the dimensional variation in mass production of the inner plug. Hereinafter, each step will be described in detail.

  Step (a) is a step of fitting the ball (2) into the mouth end (10) of the inner plug (3). The material of the ball (2) is not particularly limited, but generally, an inorganic compound such as synthetic resin, metal, or ceramic can be used. On the other hand, since the material of the inner plug (3) needs to be expanded in accordance with the size of the ball, a synthetic resin is used. The synthetic resin used for the inner plug is not particularly limited, but if the synthetic resin has a relatively low softening point, the step of expanding the inner plug in accordance with the size of the ball (step (c)) is efficient. For example, it is preferable to use low density polyethylene (softening point: 75 to 90 ° C.).

  Step (b) is a step in which the ball (2) is inserted into the front end portion (10) of the inner plug (3) to be in a temporarily fitted state. In order to make the gap between the expanded inner plug and the ball constant without variation, it is preferable to use a jig or the like to make the positions of the ball and the inner plug constant. Moreover, the coating amount of the finished product can be adjusted by the positional relationship between the ball and the inner stopper. That is, the width of the ball in contact with the mouth tip end portion (10) of the inner plug changes depending on the degree of pushing of the ball, and the degree of expansion of the mouth tip end portion of the inner plug can be adjusted. For example, if the ball is fixed at a position where it is half-pressed, the portion corresponding to the diameter of the ball is located at the tip of the mouth end of the inner plug, so the tip of the inner plug is pushed most widely, and the amount of application in the finished product is reduced. You can do the most.

  When the part corresponding to the diameter of the ball is fixed so that it is located at the mouth tip of the inner plug as described above, the mouth tip of the inner plug is in the most expanded state. However, when cooled to a temperature lower than the softening point, the internal structure of the synthetic resin that forms the inner plug is slightly restored to the state before expansion, and the mouth tip of the inner plug slightly shrinks There is no problem with the ball falling off. In addition, since the degree of shrinkage is the same under the same conditions, there is no variation in the coating amount.

  In step (c), the ball (2) is inserted into the front end (10) of the inner plug (3), and in a temporarily fitted state, in an atmosphere at a temperature higher than the softening point of the synthetic resin constituting the inner plug. It is a step (heat treatment step) of holding at. By setting the temperature higher than the softening point of the synthetic resin, the tip of the inner plug can be expanded and stabilized to the size of the ball. Further, when the ball material is a synthetic resin, it is preferably held in a temperature atmosphere between the ball and the softening point of the inner plug. At such a temperature, since the temperature is lower than the softening point of the ball, the tip end portion of the mouth of the inner plug can be expanded while preventing deformation of the ball. In addition, when using a synthetic resin as the material of the ball, there is no particular limitation as long as it is higher than the softening point of the synthetic resin of the inner stopper, but polypropylene (softening point) generally used as a container material : 95-130 ° C).

  The time for maintaining the temporary fitting state (temporary fitting product) at a predetermined temperature should be appropriately set as the time required to stably expand the inner plug according to the material and shape of the inner plug. is there. If the holding time is too short, the inner plug may not be sufficiently expanded and deformed. On the other hand, if the holding time is too long, there is little adverse effect on expanding and stabilizing the inner plug, but it should be kept longer than 3 minutes. However, there is no change in the effect of expanding and deforming the inner plug, and there is a possibility that the work efficiency may be adversely affected if held for too long. Therefore, the holding time is usually preferably about 1 to 3 minutes.

  The heat treatment of the temporary fitting product is not particularly limited as long as the temperature can be kept constant, but it is preferable to use general means such as blowing warm air or immersing in hot water.

  Step (d) is a step of further pushing the ball (2) into the inner plug (3). It is preferable to push the ball after cooling to a temperature lower than the softening point. This is because by cooling to a temperature lower than the softening point, the shape of the mouth end of the expanded inner plug can be maintained. Cooling can be performed by air cooling, water cooling, ice cooling, or the like.

  Step (e) is a step of completely fitting the ball (2) to the inner plug (3). Since the mouth tip end portion (10) of the inner stopper is expanded by a predetermined size in accordance with the size of each ball, the gap between the ball and the inner stopper mouth end portion is constant. Thereby, the dispersion | variation in the coating amount in each roll-on container can be eliminated.

  Step (f) is a step of fitting a set product (fitting product) of a ball and an inner stopper into a container filled with contents. A method for fitting the set product and the container is not particularly limited. Generally, the set product and the container are fixed by press-fitting using the stretchability of the synthetic resin or by providing an undercut.

  A process (g) shows the state completed through the manufacturing method of the roll-on container of this invention. In addition, the conventional manufacturing process consists of a process (a), a process (e), a process (f), and a process (g), and the heat treatment in the temporary fitting state of the process (b) to the process (d). It does not include a process.

  Since the roll-on container manufacturing method according to the present invention expands and stabilizes the mouth end of the inner plug according to the size of the ball, the diameter of the inner plug becomes larger, and the contents tend to be easily produced as a whole. However, it is possible to adjust the coating amount by a method such as adding a thickener to the contents and increasing the viscosity.

  In general, the gap between the ball of the roll-on container and the inner peripheral surface of the inner plug is made wider on the container side and the mouth end of the inner plug is made narrower in order to reduce the rolling friction of the ball. For this reason, the application amount of the contents is almost determined by the gap between the ball and the mouth end of the inner plug, and the roll-on container manufacturing method according to the present invention adjusts the gap of this part, The effect of making the content application amount constant is great.

  Hereinafter, the result evaluated about the roll-on container manufactured with the manufacturing method of this invention is demonstrated as an Example.

"Evaluation test"
For the following test products, the gap between the ball and the front end of the inner end of the plug was measured.
The test products 1 to 6 are containers manufactured by the manufacturing method according to the present invention (the above steps (a) to (g)).
The ball material was polypropylene (softening point: about 84 ° C.), and the inner plug material was low-density polyethylene (softening point: about 115 ° C.).
In the heat treatment step, the temporarily fitted product is immersed for 1 to 40 minutes in hot water of 90 ° C. corresponding to the temperature between the softening point of polypropylene and the softening point of low density polyethylene (step (c)), and then in ice water. It was immersed and cooled, and the ball was further pushed into the inner plug (step (d)).
The test products 7 to 9 are containers manufactured by a conventional manufacturing method (the above steps (a), (e), (f), and (g)).

  As shown in Table 1, in the test products 1 to 6 (Examples 1 to 6), the ball diameter is 18.67 to 18.92 mm, and there is a variation of about 0.13 mm as the radius of the ball. Through the heat treatment process, the gap (R-r) between the mouth end of the inner plug and the ball is 0.41 to 0.48 mm, and the variation in the gap (Rr) is as small as 0.07 mm. We were able to. This is due to the effect of expanding and stabilizing the mouth end of the inner plug according to the size of the ball.

  On the other hand, in the test products 7 to 9 (Comparative Examples 1 to 3), the ball diameter is 18.72 to 18.92 mm, and the radius of the ball has a variation of about 0.1 mm. The clearance (Rr) between the front end of the inner plug opening and the ball is 0.05 to 0.19 mm, and the variation in the clearance (Rr) is about 0.14 mm, which is even larger. This is due to the variation in the mouth end of the inner plug added to the variation in ball size.

DESCRIPTION OF SYMBOLS 1 Container body 2 Ball | bowl 3 Inner plug 4 Cap 5 Sealing step part 6 Pressing rib 7 Inner peripheral surface 8 Flow path 9 The clearance gap between a ball | bowl and the inner plug port front end 10 Open end

Claims (8)

A method for manufacturing a roll-on container having an inner plug that rotatably fits and holds a ball at a container mouth, the first fitting step of fitting the ball into the front end of the mouth of the inner plug, and a synthetic resin constituting the inner plug An expansion stabilization process that expands and stabilizes the inner diameter of the mouth end of the inner end of the stopper in the atmosphere at a temperature higher than the softening point of the ball, and then stabilizes the ball into the inner stopper. second fitting step and, by fitting engagement of the ball on the inside cap through the roll-on container manufacturing method characterized by assembling the inner plug a ball entering completely fitted to the inner plug to.   The ball is made of synthetic resin, and the ball is inserted into the tip of the mouth end of the inner plug. In an atmosphere at a temperature between the softening point of the synthetic resin constituting the ball and the softening point of the synthetic resin constituting the inner plug. The inner diameter of the mouth end of the inner end of the stopper is expanded and stabilized to the diameter of the abutted part of the inserted ball, and then the ball is pushed into the inner stopper, and the ball is completely fitted into the inner stopper to make the ball into the inner stopper. The method for producing a roll-on container according to claim 1, wherein the roll-on container is assembled.   The method for producing a roll-on container according to claim 1 or 2, wherein the synthetic resin constituting the inner plug is low-density polyethylene.   The method for producing a roll-on container according to any one of claims 1 to 3, wherein the synthetic resin constituting the ball is polypropylene.   The method for producing a roll-on container according to any one of claims 1 to 4, wherein the softening point of the low-density polyethylene constituting the inner plug is 75 to 90 ° C.   The method for producing a roll-on container according to any one of claims 1 to 5, wherein the softening point of polypropylene constituting the ball is 95 to 130 ° C. In a second fitting step, after cooling, push the inner plug of the ball, the production method of the roll-on container according to any one of claims 1 to 6, wherein Rukoto to be input completely fitted to the inner plug of the ball.   A roll-on container produced by the method for producing a roll-on container according to claim 1.

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