JP2006001575A - Pet bottle capable of keeping longitudinally reduced condition and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing a PET bottle which can be substantially reduced in its longitudinal width (height) compared with the time when a PET bottle body is filled with contents. <P>SOLUTION: The PET bottle body has a part or the whole of its height direction formed as horizontal bellows except a spout at the upper end, a width in the height direction of the spout and a width of the height direction of a bottom. When the molded PET bottle body is longitudinally compressed and the bellows-like portion of the bottle body is pressurized in the center direction of the bottle body from one or both sides of the longitudinal direction, the bellows-like portion can keep overlapped and collapsed. In addition, valleys constituting the bellows are formed in approximately annular recesses toward the axial direction of the bottle body. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

The present invention mainly uses a preform to form a juice or mineral water container by using a blow molding method generally called a stretch blow or an index blow or a pet resin blow. In particular, the present invention relates to a plastic bottle having a different height when the contents are filled and when empty, and a method of manufacturing the same.

The production amount of synthetic resin bottles has become enormous in recent years.

However, when the plastic bottle body is drunk up and discarded, when the plastic bottle body is discarded, it is a bottle with the shape before it is drunk up. When discarding this in a so-called trash box, the air is thrown into the trash box. In such a situation, it fills up quickly, it is discarded on the street and has the biggest drawback of worsening the living environment. In addition, the cost of collecting the drunk PET bottle body and the labor cost for cleaning are public works It is a big burden.

  This type of synthetic resin bottle can be manufactured by simple means such as blow molding, but it is still strong enough to withstand vibration during automobiles and other transport means that are subject to severe vibrations, as well as in stores that are stacked. Some were not enough.

  This also means that when transporting from a container manufacturer to a company that fills juice, mineral water, etc., the PET bottle itself is bulky and air is being transported. The proportion of the cost was considerable.

Therefore, the inventor of the present application has provided a liquid container devised so that the container can be easily reduced when collecting the waste of the liquid container.

This is because the peripheral wall of the liquid plastic bottle body made of a relatively soft synthetic resin and having a mouth portion at the upper end has a bellows shape. (See Patent Document 1)

In addition to this, by applying a load in the vertical direction and / or torsional direction of the PET bottle main body, the volume is substantially reduced, and the means for holding the reduced shape and the pet The invention of the bottle body (see Patent Document 2) was proposed.

As a result, all of the above-mentioned purposes, that is, when the plastic bottle body was crushed, could sufficiently cope with the height and the container being further reduced and kept in that state. Such a bottle that can be expanded and contracted in the height direction is convenient for transporting a large amount at one time by shrinking from the molding factory to the content filling factory, and dramatically increases the capacity in the trash bin after drinking and drinking. There is an advantage that the absolute amount to be improved and conveyed to the processing plant can be increased as much as possible.

However, not only this, but when drinking contents such as juice lying on the beach, for example, it is convenient if the vertical axis of the plastic bottle itself can be bent, and while drinking In the case of quitting, if it is possible to reduce only the part that has been drunk, unlike the case where the height capacity could not be changed in the past, it can be easily accommodated in a handbag or the like.

At first glance, these bottles seem to have been solved by making their external shape bellows-like, but they are actually relatively thin synthetic resin materials that are recently "inexpensive" and relatively strong materials. In some so-called pet resins, repeated expansion and contraction operations result in the original state without breaking, tearing, scratching, or shrinking, particularly the peaks and valleys constituting the bellows. As a result of the resilience to try, it was even said that it was impossible to make a bellows-shaped container with a so-called PET bottle resin.

JP2001-213418 (abstract) JP2002-68156 (Abstract)

In general, an object of the present invention is to propose a method of manufacturing a plastic bottle whose vertical width (height) can be substantially reduced as compared with the case where the contents are filled in the plastic bottle body.

Another purpose is to reduce the height (volume) when transporting from this plastic bottle body factory to a factory filled with mineral water or juice. It is to propose a plastic bottle and a manufacturing method for the plastic bottle body.

Another purpose is to easily reduce the volume (height) of the plastic bottle body even when an infant or the elderly easily discards the plastic bottle body after drinking and drinking juice or mineral water in the plastic bottle body. The idea is to propose a plastic bottle that can be made and a method of manufacturing the same.

Another object of the present invention is to propose a method for manufacturing a PET bottle having a shape that is easy to hold the PET bottle body and does not slide down even if condensation occurs on the surface thereof. An object of the present invention is to reduce the vertical width of an empty portion in the middle of drinking the contents of the plastic bottle body.

Another object of the present invention is that empty containers that have been drunk up in the past are thrown away in the state of the vertical width (height) as they are, and compared to the fact that the trash can becomes full and can no longer be accommodated. This is an increase in the number of products compared to conventional products. This means that a large amount of empty plastic bottles can be transported at the same time, so the transport amount, collection costs, and labor costs for cleaning and collection Is to be able to mitigate.

In addition, such a PET bottle body is suitable for manufacturing a large amount at a low cost, and the formation of the bellows portion and each ridge constituting each bellows is ensured. As a result, when the PET bottle body is crushed, the plastic bottle body is crushed. It was possible to propose a plastic bottle and a method for manufacturing the same so that the state can be maintained.

  Thus, the present invention is characterized in that there is a plastic bottle body in which a part or all of the vertical direction is a horizontal bellows shape, excluding the vertical width of the drinking mouth part at the upper end, and there is a manufacturing process. Is a PET bottle molded in a state substantially lower than the vertical width (height, volume) when the contents are filled, and such PET bottles are transferred from the manufacturing factory to the factory filling the contents. Since the vertical width (height and volume) is substantially reduced when transported, the amount can be increased more than the conventional transport amount.

  Moreover, the PET bottle of the present invention has a bellows-like outer periphery, so that it is easy to hold and there is no possibility of slipping even if so-called condensation occurs on the outer surface.

In addition, as a feature of the present invention, when a blank portion is formed in the main body of the PET bottle by an operation such as drinking the contents, the state is substantially smaller in volume and lower than the height when the contents are filled It is to be able to.

  As a result, even if a so-called “leftover” occurs in this plastic bottle, it can be carried in a bag such as a handbag. Since it is thrown away into a trash can after being reduced in height, the trash can no longer fills up as in the past, and transportation and collection operations that carry air are dramatically improved.

  Generally, the PET bottle of the present invention and the method for producing the same are characterized in that the top of the drinking mouth part, the width of the drinking mouth part in the height direction, and the width of the bottom part in the height direction are the same. The process of molding the plastic bottle body that is partly or entirely horizontal bellows-shaped, and compressing the molded plastic bottle body in the vertical direction, the bellows-shaped part of the plastic bottle body in the longitudinal direction When pressed in the center direction of the plastic bottle body from one or both, the bellows-like portion can be kept in a crushed state, and the valleys forming the bellows-like shape are formed on the plastic bottle body. That is, it was formed into a substantially annular depression facing the axial direction.

When the bottle body is now transported from the molding factory to the filling factory, or when the contents are drunk up and crushed, the thin ridges are pushed first and the top surface of the bowl is pressed. Move in the direction where the bottom faces overlap.

  Furthermore, as a result of continuously applying a force from the height direction, the force gradually shifts and relaxes in the direction of the valley, and at this time, in the present invention, the above-mentioned valley where the load burden due to bending is the most is annular. Since the annular depression shape has a structure in which the load stress is dispersed on average, the bottle body can sufficiently withstand the bending action of the bottle body. It was possible to prevent the occurrence of scandals that caused the contents to overflow due to tearing or damage.

  Further, in this case, each of the bellows-like portions is also characterized by having a cross section “>” having a curved upper surface and a straight lower surface.

  Thus, the force for crushing the plastic bottle body is transmitted to the upper surface of the bellows-like portion, and since the upper surface is curved, it is naturally longer than the straight shape of the upper surface, and is crushed by that amount. The upper surface of the upper surface presses above the annular recess. As a result, the center position of such an annular recess rotates (moves) downward, which acts as an action force that easily superimposes the upper and lower surfaces of each bellows. The PET bottle main body of the present invention was able to be folded very easily even with a relatively small force such as an elderly person.

Further, in this case, when the volume is made of a normal PET bottle resin having a volume of about 500 milliliters, the height (width) of the bottom surface of each bellows portion excluding its lowermost step is about 5 to 7 mm, and the height of the top surface thereof. It is also a feature of the present invention that the (width) is wider (higher) than the height (width) of the lower surface, and the diameter of the annular recess is approximately 0.5 to 3.0 mm. It is also a feature.

In addition, the substantially annular recess has a feature that an inner end portion is connected to the recess and bay-shaped recesses are provided in the upper side and lower side inward of the bellows. .

  Thus, the presence of the bay-shaped dent further increases the action of the annular dent, and when the PET bottle body of the present invention is expanded and contracted, the force of the accordion-shaped portion is ensured with a slight force. The height of the plastic bottle body can be reduced to about 1/3 to 1/8.

  In this case, it has been proved by repeated experiments that the generally bay-shaped dent described above has a length of 2 to 5 mm and is preferably a bay shape of 8 to 15R. In addition, as a result of the experiment, it has been known that the upper surface of each bellows-shaped portion constituting the plastic bottle body is suitable to have a curved shape of 16 to 20R except for the uppermost stage.

Thus, the plastic bottle main body obtained by the method for manufacturing a plastic bottle capable of maintaining the reduced length direction of the present invention and having the accordion-like portions overlapped with each other has its In this state, the plastic bottle body is transported to a filling factory for the contents to be filled in the plastic bottle body, and air is blown in before the above contents are filled or inflated, or the plastic bottle body is moved at a pressure to fill the contents. It is designed so that it can be restored to the original state before being crushed. At this time, the process of compressing the plastic bottle main body is performed while sucking the air in the plastic bottle main body.

In carrying out the present invention, as a means for compressing the bottle body if necessary, a mechanical mechanism for compressing the plastic bottle body in the vertical direction may be used.

In the process of molding the plastic bottle body, the preform is automatically supplied into the mold and the bellows-shaped plastic bottle body is molded with high-pressure air of about 40 kg. By doing so, when the present PET bottle body is transported from the molding factory to the filling factory of the contents, it is stretched again at the filling factory, the work of expanding the volume, the contents are drunk, and the volume is increased by that amount. Even in the operation of shrinking and the expansion and contraction of the operation of completely crushing and discarding, the PET bottle could be manufactured without the possibility of wrinkles, tearing or bending.

The present invention has a drinking part at the upper end, a small width in the bottom part, and a flat part provided in the middle part, and the drinking part, the width in the height direction, and the flat part. Except for all plastic bottle bodies that have all or part of the longitudinal shape of the bellows in the horizontal direction, of course, the entire shape of the plastic bottle body is a cylinder or rectangle including an ellipse. The horizontal cross-sectional shape of the plastic bottle body includes a round shape and an oblong shape including an ellipse. The horizontal shape of the plastic bottle body is appropriately selected from including a prism, a cone and a pyramid including a wharf, a drum (HOURGLASS DREAM-SHAPED), and a barrel shape. Appropriately selected from the square shape, it can be applied to the manufacturing means of the container that can be wrapped around the outer periphery of the PET bottle body with a label printed with a guide or trademark of the container contents Is also a technical category of the present invention. Think of things.

  The main effect of the plastic bottle main body (1) described above is that the volume of the plastic bottle main body can be reduced when the plastic bottle main body is discarded, and the number that can be accommodated in the trash can is increased. That is.

  In addition, since the reduced PET bottle main body can achieve a large amount of conveyance at the same time, the recovery cost and the labor cost for cleaning and recovery can be greatly reduced.

  Furthermore, the plastic bottle main body of the present invention has a good appearance, which has given great interest to the user, and the shape of the bellows of the plastic bottle main body serves as a friction stopper, and the plastic bottle main body slips during use. The possibility of dropping or overflowing contents can also be prevented.

  It is also known that the shape of a plastic bottle body crushed according to the present invention is good in design and can be used as an external container as it is.

  In general, the effect of the present invention is that all or part of the longitudinal direction is the horizontal direction except for the mouth portion at the upper end, the width in the small height direction at the bottom, and the width in the mouth portion and the height direction. When the plastic bottle body is discarded, the volume of the plastic bottle body is reduced by a simple operation and a small force, even for infants and the elderly. It was to be able to easily produce a large quantity of containers that can be.

  The present invention has other excellent objects, features, and effects, which will be clarified in the description of the following examples.

That is, in FIG. 1, (1) is a plastic bottle main body, and the outer periphery and inner periphery of the height (length) direction except the drinking mouth part of an upper end part are bellows-like (2).

FIG. 2 shows a state in which the inside of the plastic bottle body (1) is crushed from one or both in the height (length) direction when it is not yet filled with mineral water, or after drinking up. .

In other words, the present invention has an excellent configuration for bringing such a PET bottle body (1) into a crushed state and maintaining the crushed state, and exhibits an excellent action.

As an example of the configuration of the plastic bottle body (1), as can be seen in FIG. 1 (500 milliliter plastic bottle), (3) shows the diameter of the plastic bottle body (1) with a male screw engraved on its outer circumference, about 28 mm in diameter, high A drinking mouth portion having a length of about 23 mm is directly connected to the inner end portion of the bellows-like shape (2) at the first stage (uppermost stage). Thus, the outer diameter (2A) of the first step bellows is 66.4 mmφ, which is smaller than the maximum outer diameter 70.8 mmφ (2n) of the bellows shape of the plastic bottle body (1).

In this case, the second-stage bellows-shaped outer diameter (2B) is larger than the first-stage bellows-shaped outer diameter (2A) with respect to the first-stage bellows-shaped outer diameter (2A). It is smaller than the maximum outer diameter (2N) of 1).

Further, it is larger than the second step bellows-like outer diameter (2B), and the third step bellows-like outer diameter (2C) of the plastic bottle main body (1), so that it can be stepped as viewed from the side. Of course, this is not limited to the three-stage as described above, but may be an appropriate plurality of stages outside the four-stage outer diameter (2D).

Specifically, the container of FIG. 1 is in a plastic bottle body (1) having a height of 195 mm × maximum diameter of 71.5 mm and a capacity of 500 ml, and has a shape having eleven ridges 2A to 2N.

The outer diameter of the second step bellows-like outer diameter (2B) was 67.9 mm.

Similarly, the outer diameter (2C) of the third step bellows was 69.7 mm.

In addition, the outer diameters of the following fourth to eleventh stages of the bellows are the same as the maximum outer diameter (2N) of the bellows, and the inner diameter between them is also the same as that of the third stage of bellows (2C). It is the same as that between the four-stage bellows (2D).

In this case, each of the kites has a shape like an unidentified flying object (UFO) called an Adamski type, and thus has a shape that is divided into two parts in the horizontal direction.

At this time, the height (h2) below the first step bellows-like outer diameter (2A) in FIG. 1 is 5.5 mm, and the height (h1) above the second step bellows-like outer diameter (2B) is 7 mm. The lower part (h2) was 5 mm, and the third step bellows-shaped outer diameter (2C) was 8.5 mm on the top and 6.5 mm on the bottom.

More specifically, the bellows shape is an important point of the cross-sectional shape, particularly the thickness, which is shown in FIG.

That is, the thickness of the valley portion (P) constituting the bellows shape (2) is thicker than the thickness of the mountain portion (Q). As a specific example, The thickness of the valley (P) is 0.49 mm, the thickness of the peak (P) is 0.27 mm, and the thickness of the approximate middle between the valley (P) and the peak (Q). Was 0.39 mm.

The shape shown in FIG. 3 is the one previously proposed by the inventor of the present invention and applied for a patent in Japan on April 14, 2004 (Japanese Patent Application No. 2004-118549). It is a thing.
That is, an annular recess (R) is provided by projecting in the axial direction of the PET bottle body (1) from the valley (P), and the recess (R) has a diameter of 0.5 to 3. 1.0 mm, especially 1.0 mm has been found to be optimal for the plastic bottle body (1) of FIG.

FIG. 7 is a further improvement over the configuration of FIG. 4, and is in the valley (P), is connected to the inner end of the recess (R), and has a bellows shape (2). A bay-shaped dent (T) (U) is provided in the upper and lower sides of the ridge.

In this case, the bay-shaped dent (T) (U) is about 2 to 5 mm, and a bay shape of 8 to 15 mmR is preferable. In particular, the length of the dent (R) is about 3.5 mm and 12 mmR is added. Best.
These figures are for a 500 ml volume that is generally available on the market, with 11 steps of bellows (2), 350 ml, 1 liter, 2 liters, and its bellows (2) These numbers are appropriately changed depending on the number of stages.

In FIG. 12, (W) is a preform that is inserted into a mold (not shown) before molding the plastic bottle body (1) of the present invention.
The illustrated preform (W) is for molding the 500 ml plastic bottle body (1) shown in the above-mentioned embodiment, and has a height of about 147 mm and a maximum diameter of 27.97 mm.

Thus, the preform (W) has a screw part (b) for covering a cap (not shown) of the plastic bottle body (1) at the lowermost stage, and the preform (W) ) To the top (a) (a ') (a' '), the thickness of each peripheral wall is 1.85 mm at the bottom (a), 2.00 mm at the second (a'), It is important that the third stage (a ″) is 1.9 mm.

Further, although not shown or described in detail here, when the preform (W) is heated for molding, the first stage (a) portion is heated (strong) and the second stage ( It is important that a ′) is heated in the middle and the third stage (a ″) is heated at a relatively low temperature.

Thus, when forming the plastic bottle body (1), the preform (W) is guided into the mold, the mold and the preform (W) are heated, and hot air is sent into the preform (W) at the same time. . At that time, the temperature of the outer side of the preform (W) in the mold is generally higher than that of the inner side. This is because the preform (W) is overheated by a heater installed outside the preform (W).

Here, the heating means for the preform (W) will be described. In FIG. 12, the preform (W) is preheated before being introduced into the mold and then introduced into the mold. The preheating of the preform (W) is to soften to a predetermined temperature by passing through a plurality of opposed heater panels (4) for a predetermined time. In this case, the heater panel (4) Several stages of heaters (5) are arranged in the vertical direction, that is, in the height direction of the preform (W) to irradiate the preform (W) with heat.

At this time, the heater (5) is high in the first stage (a) (lowermost stage) of the preform (W), and the second stage (a ') is in the middle and third stage compared to this. It is important to adjust the temperature so that (a ″) (uppermost) is lower.

The thickness of the preform (W) itself is 1.85 mm, which is the smallest in the first stage (a), and the second stage (a ′) is 2.00 mm, which is the thickest. It has been found that the upper stage (a ″) (the lowest stage when the bottle body is actually (1)) should have a thickness of about 1.9 mm.

The preform (W) that actually swelled during blow molding first comes into contact with the point where the mold valley (P) is formed, so that its wall thickness is increased (increased) and conversely the peak ( Since Q) is relatively far away, it is also an important factor in this embodiment to enable molding so that the thickness is reduced.

Further, as shown in FIG. 4, it is an example of the dimensions of the first to third stage ridges (2 A to 2 C), but the shape of the upper surface of the wide abacus sphere is protruded outward. In the embodiment, it is a bay shape of 120 to 20 mmR. On the other hand, it is also important that the lower surface is linear through a peak (Q) of 0.8 mmR.

This configuration of the present embodiment will be described together with its action. In FIG. 1, the plastic bottle main body (1) is divided into two parts, a middle part (A) including an intermediate part (B) and a lower part, and an upper shoulder part (C). The body part (A) is formed with a heel having the same inner and outer diameters, and the shoulder part (C) is curved in a convex shape with a gentle inclination in the direction of the drinking mouth part (3). C) gradually reduces the inner diameter of the valley (P) forming the ridge between the middle part (B) and the drinking mouth part (3), and the inclination angle is also different from that of the trunk part (A). Since the central part is stretched, the inner diameter and the inclined surface of the peak (Q) and valley (P) forming the ridges are stretched and stretched by the strength and elasticity of the material. You can keep it.

In addition, it is natural that the so-called “sit” is improved by making the bottom of the plastic bottle main body (1) a steeply concave shape.

What is important here is the sectional shape of the shoulder (C) of the plastic bottle body (1), which is shown in FIG.
That is, the thickness (a1) of the drinking mouth part (3) in the plastic bottle body (1) is 1.740 mm, and the part (6) reaching the middle of the upper surface in the first stage of the bellows shape (2) In comparison with this, the thickness (c1) between the middle and the first ridge (Q) is 0.194 mm, and the ridge ( The thickness (d1) of Q) is 0.137 mm in this embodiment, and the thickness (e1) of the intermediate part from the peak (Q) to the valley (P) is 0.191 mm, which is thin. It is.

  Now, when the molding of the plastic bottle main body (1) is completed and transported to the filling factory or the contents are drunk up, the plastic bottle main body (1) is flattened with both hands (G) and (H) as shown in FIG. When placed vertically between the palms and pressed with both hands (G) and (H) in the middle direction of the plastic bottle main body (1), the plastic bottle main body (1) is crushed as shown in the figure.

  At this time, the upper surface of the first step bellows-like shape (2) is thicker than the other portion (6) from the drinking mouth portion (3) to the middle, and the second step is compared with this. Since the following is thin, the soft body (A) is crushed with a hard disc-like shape, so that a large force is not required for the crushing operation, and the outer diameter of the first stage ( Since 2A) is smaller than the outer diameter (2B) of the second stage as described above, each bellows (2) portion of the bottle body (1) is folded in order, so that it is easy for both infants and the elderly. The bulk (height) can be reduced.

Furthermore, in the embodiment of the present invention, there are many ideas for more easily crushing. That is, when the heel of the shoulder (C) is first pressed from the state shown in FIGS. 3 and 5, the end face of the trough (P) is compressed on the end face of the adjacent trough in the vertical relationship. At this point, when viewed from the top of the mountain peak (Q), it corresponds to the fact that the valleys (P) on both sides are pushed toward the peak side of the mountain (Q). On the other hand, since the compression component force on the gentle inclination side is less inclined and is larger than the compression component force on the steep inclination side of the lower surface, the valley portion (P) on the steep inclination side is on the apex side of the peak portion (Q). It has moved.

  In the embodiment shown in FIGS. 4 and 5, there are two major changes in the plastic bottle body (1).

That is, the first is that the inner diameter of the peak (Q) that constitutes the ridge increases with the expansion pressure, or the inner diameter of the valley (P) decreases with the compression pressure, and the second is the lower surface that constitutes the ridge. The steeply inclined surface is bent.

Subsequently, the steeply inclined side passes directly below the peak (Q), and further sinks into the inside of the gently inclined side of the upper surface as seen in the figure, thereby moving the height of the plastic bottle body (1) to the shortened state. Then, the force that restores the inner diameter of the peak (Q) and the inner diameter of the valley (P) works, or the lower surface is bent by the above operation to be restored to the extended state, and it becomes a safe state. . Therefore, even if the compression force is not always applied, this shortened state can be maintained.

Thus, the force for crushing the plastic bottle main body (1) is transmitted to the upper surface of the bellows (2) portion as described above. The upper surface, which is longer than the straight line and is crushed by that amount, presses the upper end of the annular recess (R). As a result, the center position (X) of the annular recess (R) as shown in FIGS. 5 and 6 has an action (X ′) of rotating (moving) downward, which is in the shape of each bellows (2). Therefore, the plastic bottle main body of the present invention can be folded into a folded state very easily with a relatively small force.

The presence of the bay-shaped recesses (U) and (T) shown in FIGS. 7 and 8 further increases the action of the annular recess (R), and accordingly, the PET bottle main body (1 ) Can be expanded and contracted, even with a slight force, each bellows-shaped part (2) can be surely overlapped, and the height of the plastic bottle body can be reduced to about 1/3 to 1/8. It is.

  In addition, the PET bottle main body (1) of the present invention has a height (volume) of 1/3 to 1/4 or less in repeated experiments, and when the PET bottle main body is transported from a molding factory to a filling factory, its capacity The contents can be filled to the original volume at the filling factory, and when drinking, the body of the plastic bottle can be bent or shrunk according to the amount of drink, and the volume when discarded It has a structure that can withstand frequent expansion and contraction actions such as shrinking to a state close to “0” and a bending action.

This extends to the shape of the preform (W) itself and the means for preheating it. In other words, the conventional PET bottle always requires that the entire container below the mouthpiece has the same thickness, and for that purpose, the portion slightly below the mouthpiece of the preform has its diameter. Means to reduce was taken. That is, the drinking port portion of the PET bottle has a small diameter and is formed thick, and prevents the thickness from being reduced as it goes toward the outer diameter of the PET bottle body.

In this regard, in the present invention, the plastic bottle body (1) can be reduced with a small force by thickening the space from the drinking mouth (3) to the middle thereof. Even in the process of reheating (W) itself, the temperature of the plastic bottle body (1) in the height direction is changed in the upper, middle, and lower directions. Even if it was easily reduced or returned to its original height, it was possible to prevent damage.

As described above, the bottle of the plastic bottle body (1) has a shape like a wide Adamski type UFO, and is thus divided into two parts in the horizontal direction.

  In the figure, the front surface of the ridges forming the bellows shape is a wide Adamski-type UFO shape, and the upper surface (n) of the wide Adamski-type UFO shape protrudes outward from both the inner surface and the lower surface shape. In this embodiment, it is an important point that the upper surface has a bay shape of 20 mmR, whereas the lower surface has a straight shape through a peak (Q) of 0.8 mmR.

  And the trough part (P) with a small internal diameter receives the compression pressure, and the pressure stress has generate | occur | produced.

When the compression pressure disappears, the stress is released, and when the contents such as juice are filled, the state is restored to the stretched state.

  Moreover, this embodiment is a case where the diameter of the ridge of the shoulder portion (C) of the plastic bottle body (1) is increased in diameter as described above, and as a result, each crushed ridge is the outer periphery thereof. Are superimposed on a slope that is above the inner periphery.

  As a result, the height (volume) of the PET bottle main body (1) becomes 1/5 to 1/8 or less in repeated experiments, and even if it is abandoned in a trash can, the space can be remarkably reduced. It was.

  In addition, since the product that is usually in circulation as a drinking container is 500 milliliters, it is rarely “drinked down” at once.

Therefore, you must carry a container that has an empty part with the same volume even if you have left over.

In that respect, the container of the present invention can be easily carried even in a handbag because the empty portion after being drunk is shrunk so that it can be carried.

Further, the PET bottles used in many beverage containers are provided with a flat posted portion indicating the trademark or content or indicating the source in the middle of the PET bottle body (1). Has the effect of

Front view of the entire plastic bottle body of the present invention Front explanatory drawing of the entire plastic bottle body in a crushed state Cross-sectional enlarged view of the buttocks that make up the bellows shape Expanded cross-sectional action explanatory diagram Explanatory drawing of the crushing stage Explanatory drawing of action section in the crushed state Explanatory drawing of enlarged cross-sectional action of a bag of another embodiment Cross-sectional view of the operation description Action explanatory diagram of the collapsed state Expansive action explanatory diagram of the collapsed state Cross-sectional enlarged explanatory drawing from the mouth part of the bottle body to the shoulder Cross-sectional illustration of preform

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Plastic bottle 2 Bellows shape 3 Drinking mouth part 4 Heater panel 5 Heater 6 From 1st stage mouth part to 2A 1st stage outer diameter 2B 2nd stage outer diameter 2C 3rd stage outer diameter 2D 4th stage outer diameter 2N Nth stage outer diameter h1 Upper h2 Lower a Bottom stage a 'Second stage a''Third stage b Screw part A Body part B Middle part C Shoulder part G Both hands H Both hands P Valley part Q Mountain part R Recess S Thickness T dent U dent V middle thickness W preform X center position

Claims (14)

A part or all of the height direction is a horizontal bellows shape, except for the upper end drinking part, the width in the height direction of the drinking part, and the width in the height direction of the bottom part. When the plastic bottle body is compressed in the longitudinal direction, and the bellows-shaped part of the plastic bottle body is pressed from one or both of the longitudinal directions toward the center of the plastic bottle body, The accordion-shaped portion is formed so as to be able to maintain a collapsed state, and the valley portion forming the accordion-shape is formed into a substantially annular depression facing the axial direction of the plastic bottle body. A plastic bottle that can keep its length reduced. Each of the bellows-like portions described in claim 1 can maintain a state in which the length direction is reduced, characterized in that the upper surface is curved and the lower surface is configured by a straight section “>”. Plastic bottle. The height (width) of the lower surface excluding the lowermost step of each bellows-shaped portion shown in claim 2 is about 5 to 7 mm, and the height (width) of the upper surface is higher than the height (width) of the lower surface. A plastic bottle that is characterized by a wide (high) width and can maintain a reduced length. 2. The plastic bottle according to claim 1, wherein the diameter of the substantially annular recess is 0.5 to 3.0 mm, and the length direction can be kept reduced. The length direction is characterized in that the inner end portion is connected to the substantially annular depression in claim 1 and claim 4 and bay-shaped depressions are provided in the upper side and lower side inward of the bellows. A plastic bottle that can be kept in a reduced state. The substantially bay-shaped dent according to claim 5 has a length of 2 to 5 mm and has a bay shape of 8 to 15R, and is a PET bottle capable of maintaining a reduced length direction. . The upper surface of each bellows-shaped portion according to claim 2 is a PET bottle capable of maintaining a reduced state in the length direction, characterized in that it has a curved shape of 16 to 20R except for its lowest step. . A part or all of the height direction is a horizontal bellows shape, except for the upper end drinking part, the width in the height direction of the drinking part, and the width in the height direction of the bottom part. The step of molding the plastic bottle main body and the molded plastic bottle main body are compressed in the vertical direction, and the bellows-shaped portion of the plastic bottle main body is pressed from one or both of the longitudinal directions to the central direction of the plastic bottle main body. In the PET bottle manufacturing means, the bellows-like portion can be kept in a collapsed state where the bellows-like portions overlap each other, and the troughs constituting the bellows-like shape are substantially directed to the axial direction of the PET bottle body. A method for producing a PET bottle, characterized by having a step of forming a ring-shaped recess, and capable of maintaining a reduced length direction. Each of the bellows-like portions described in claim 8 has a process in which the upper surface is curved and the lower surface has a straight section “>”, and the lengthwise direction is kept in a reduced state. Possible manufacturing method of plastic bottles. The height (width) of the lower surface is about 5 to 7 mm, excluding the lowermost step of each bellows-shaped portion shown in claim 9, and the height (width) of the upper surface is higher than the height (width) of the lower surface. A method for producing a PET bottle, characterized by having a stroke having a configuration that is often wide (high), and capable of maintaining a reduced length direction. 9. The method for manufacturing a PET bottle according to claim 8, wherein the diameter of the substantially annular recess has a stroke of 0.5 to 3.0 mm, and the lengthwise direction can be kept reduced.
The substantially annular recess according to claim 8 and claim 11 has a process in which an inner end is connected to the recess and a bay-shaped recess is provided at the upper side and the lower side inner end of the corrugated shape. The manufacturing method of the plastic bottle which can keep the state where the length direction was reduced characterized by. The substantially annular recess according to claim 8 and claim 11 has a length of 2 to 5 mm and has a process of forming a bay shape of 8 to 15R, and maintains a reduced state in the length direction. A method for producing plastic bottles. The upper surface of each bellows-like portion shown in claim 8 is characterized in that it has a curved shape of 16 to 20R except the lowermost step, and the PET bottle capable of keeping the length direction reduced. Manufacturing method.

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