JPH1035620A - Preforming method and device of tube container bottom - Google Patents

Abstract

PROBLEM TO BE SOLVED: To retain the widened state aligned until the tube container has been completely squashed by a clamp tool in the state that the height of the projection to be welded and sealed is accurately set and achieve the highly accurate dimension setting in the projection and the preliminary flat forming in the state accurately aligned. SOLUTION: A projection T2 is set by butting the upper end edge of the bottom T1 penetrated in a clamp tool 28. A state widened flat is achieved in the condition that the projection T2 is aligned by the separating displacement to the flat direction of a pair of aligning pins penetrated in only the projection T2. The accurate size setting of the projection T2 is achieved and the preliminary flat forming is achieved in the condition that the bottom T1 is accurately aligned, by squashing flat the bottom T1 by the clamp tool 28 while the condition is kept.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of preforming a bottom portion of a synthetic resin tube container including an aluminum laminated tube container which is to be hermetically sealed prior to sealing and sealing. It relates to the device to be implemented.

[0002]

2. Description of the Related Art In a tube container made of synthetic resin, contents are injected and filled from an open bottom in an upright posture, and then the open bottom is crushed flat and welded and sealed to form a container. This completes the form and achieves storage of the contents.

[0003] Therefore, the synthetic resin tube container is conveyed to the filling and filling device for the contents in an upright posture, and then is conveyed to the sealing device as it is, and the open bottom is flattened by the sealing device. The molding process of crushing and sealing by welding is followed.

When the bottom portion of the tube container is welded and sealed by the sealing device, the tube container is first flattened and crushed by a pair of clamp jigs, and then a projection portion projecting above the clamp jig is welded by the welding jig. Although the sealing is performed by welding, the flattened squeezed portion has a certain thickness and shape. And the mold surface of the shape.

[0005] Therefore, it is necessary that the projections squashed flatly and projecting on the pair of clamp jigs are positioned exactly in conformity with the mold surface of the welding jig.

In the technique disclosed in Japanese Patent Publication No. 5-20290, which is a typical example of the prior art satisfying this requirement, the bottom of the tube container is completely crushed flat by a pair of clamp jigs of a sealing device. Previously, a flat wedge having the center axis aligned with the center axis of the sealing device was intruded into the bottom, and the position of the bottom with respect to the sealing device was regulated in a centered state. Immediately before the bottom is completely crushed by the tool, the wedge is released from the bottom.

In the above-mentioned prior art, the bottom of the tube container is forcibly centered with respect to the sealing device, so that the tube container is slightly deformed or the tube container is displaced with respect to the holder. Irrespective of this, the present invention has the advantage that the tube container can be easily squashed flat in a state where the bottom of the tube container is accurately centered with respect to the sealing device.

[0008]

However, in the above-mentioned prior art, prior to the flattening of the bottom portion by a pair of clamp jigs, the wedge which had been flattened and expanded at the bottom portion was removed from the inside of the bottom portion. Need to be
For a short time between the wedge disengagement and the achievement of the crushing by the pair of clamp jigs, the mechanical restraining force on the bottom which is crushed almost flat by the pair of clamp jigs is weakened, and this mechanical There has been a problem that a slight displacement may occur at the position of the bottom of the tube container centered due to the weakened regulating force.

Also, since the wedge which achieves the centering of the bottom of the tube container expands the bottom by forcible pushing into the bottom, the wedge is pushed into the bottom in the case of a soft tube container. At times, there has been a problem that the bottom may be sagged or deformed.

Further, since the wedge is displaced along the height direction of the tube container, the wedge is formed on a centering function part having the wedge as a main part. It is difficult to combine functional parts that set and regulate the height and width dimensions of the bottom and upper parts protruding above the clamp jig. Therefore, the dimension setting of the sill can only be set by the amount of the tube container pushed up. For this reason, it is not always possible to accurately set the height of the sill portion due to bending deformation of the tube container or a molding dimensional error, and the weld strength of the formed welding seal portion may be uneven. There was a problem.

In view of the above, the present invention has been made to solve the above-mentioned problems in the prior art, and uses a pair of clamp jigs of a sealing device in a state where the height dimension of an output sill is accurately set. Until complete crushing is achieved
The technical task is to maintain the spread of the bottom in the centered state, so that the sill can be set with high dimensional accuracy and the preforming of the bottom can be achieved with the centered state very accurately. Aim.

[0012]

Means for Solving the Problems According to the first aspect of the present invention which solves the above technical problem, prior to hermetically sealing the bottom of the synthetic resin tube container, the bottom of the tube container is sealed. It is a preforming method in which the upper end is crushed flat, the bottom of the tube container is pushed up between a pair of clamp jigs of the sealing device, and the bottom is formed into a seal portion on the clamp jig by abutting. The projecting white part is projected, and a pair of centering pins are inserted into the white part within the height dimension range of the white part, and then the pair of centering pins are connected to a pair of clamp jigs. By displacing and displacing in a flat direction perpendicular to the crushing direction of the tube container, the upper end of the bottom of the tube container including the spillout portion is flattened and spread, and the sealing device at the bottom of the tube container is used. In this state, after the bottom of the tube container is squashed and held flat by a clamp jig from this state, the centering pin is closed and returned, and the centering pin is lifted and separated from the inside of the bottom of the bottom. .

According to a second aspect of the present invention, in the configuration of the first aspect, the centering of the bottom of the tube container by the pair of centering pins is performed by projecting the pair of centering pins from between the clamp jigs. The center axis of the sealing device is located at an interval smaller than the flat inner diameter width of the bottom sill, and at the bisecting point between the centering pins, and the bottom sill is pushed. Spreading is achieved by synchronously moving the pair of centering pins apart at a constant speed.

According to a third aspect of the present invention, there is provided the first or second aspect.
In the configuration of the invention described in the description, when the bottom is pushed up between the pair of clamp jigs, the interval between the pair of clamp jigs is made smaller than the outer diameter of the bottom, and the cross-sectional shape of the bottom is substantially elliptical. The method is to crush it into a shape.

According to a fourth aspect of the present invention, which solves the above technical problem, the present invention is arranged such that the sealing jig projects upwardly into and between the clamp jigs immediately above the pair of clamp jigs. A bottom plate having a flat bottom surface against which the upper end edge of the bottom of the tube container abuts is positioned. The distance between the bottom surface of the bottom plate and the top surface of the clamp jig has a value equal to the height and width of the sill. The center of the sealing device located at the center of the pair of clamp jigs, having an output shiro setting function part disposed at a position, at an interval smaller than the inner diameter width in the flat direction of the output shiro part protruding from between the clamp jigs A pair is arranged along the flat direction with the shaft center as the bisecting point, and from the lower surface of the abutting plate, smaller than the height width of the bottom sill, but at the height that is hooked on the upper edge of the sill. Protrude The out pin, have a centering function unit for constant velocity away synchronously moved along the flat direction,
The present invention has an assembling function section for assembling and holding the output white setting function section and the centering function section so as to be vertically movable.

According to a fifth aspect of the present invention, in the configuration of the fourth aspect of the present invention, the abutment plate of the output white setting function section is provided.
A fixed end plate fixedly attached to the assembling function unit and a moving end plate that is mounted with the centering pin of the centering function unit protruding from the lower surface and moves integrally with the centering pin. Means.

According to a sixth aspect of the present invention, in the fifth aspect of the present invention, a plurality of locations where the centering pins of the centering function section are attached to the moving side abutment plate of the whiteout setting function section along the flat direction. Means are provided.

[0018]

According to the first aspect of the present invention, the height width of the projecting shiro is set by the abutment of the upper end edge of the bottom of the tube container which has been pushed up between the clamping jigs, and thus the sealing portion forming function of the sealing device is provided. With reference to the upper surface of the clamp jig, which is one of the components, the height and width dimensions of the projection portion are set directly.

Also, the flat push-out operation while centering the upper end portion of the bottom of the tube container by the pair of centering pins is achieved by pulling the pair of centering pins in the flat direction with respect to the upper end portion of the bottom. However, during the operation of spreading the upper end of the bottom, the pressing force in the height direction does not act on the tube container, so that the upper end of the bottom is flattened without any risk of illegal bending or deformation. It will be centered.

The flattening and holding of the bottom portion by the pair of clamp jigs is achieved while maintaining the state in which the projecting white portion, which is the upper end portion of the bottom portion, is centered by the pair of centering pins and is spread flat. An accurate centering set by the pair of centering pins is accurately held.

At this time, since the centering pin has penetrated into the output sill with an amount of penetration within the height and width dimensions of the output sill,
Even if the flattening and holding operation of the bottom portion is performed by the pair of clamp jigs in a state where the centering pins center the output white portions, the pair of clamp jigs and the pair of centering pins mechanically interfere. Never.

According to a second aspect of the present invention, the pair of centering pins according to the first aspect of the present invention are prevented from entering the output white portion.
Achieved at the same time as the setting of the exit shiro part by pushing up the bottom of the tube container between the pair of clamp jigs,
Further, the flat upper end portion of the pair of centering pins is flattened and spread and centering is achieved by a simple and simple operation called a constant-speed separating operation of the pair of centering pins.

The invention according to claim 3 is the invention according to claim 1 or 2
The width of the bottom opening along the flat direction is increased by squeezing the upper end of the bottom that has been pushed up and into a substantially elliptical shape by a pair of clamp jigs to intrude the pair of centering pins into the output white portion in the described invention. In this way, it is possible to reliably and stably achieve the above, and it is possible to reduce the amount of displacement for flattening and spreading the pair of centering pins.

According to the fourth aspect of the present invention, the sizing of the exit shiro portion is achieved by a simple operation of abutting the upper end edge of the bottom of the tube container against the bottom surface of the abutment plate of the exit shiro setting function portion. Since the dimensions of the spill-out portion are directly based on the clamp jig, they are set stably and with high accuracy.

The pair of centering pins of the centering function portion are arranged so as to protrude from the bottom surface of the plate at a distance smaller than the inner diameter width in the flat direction of the projecting white portion protruding from between the clamp jigs. As long as there is no illegal deformation outside the allowable range, the bottom end of the tube container abuts against the lower surface of the plate, and at the same time, it is securely positioned to enter the set out portion.

When a pair of centering pins located within the projecting white portion are synchronously moved away from each other in synchronization with each other in the flattening direction, the pair of centering pins make the center axis of the sealing device a bisecting point. Due to the arrangement, the upper end of the bottom portion including the projecting white portion that has been forcibly pushed out by the pair of centering pins that move away from each other is centered at the same time when the centering pin achieves the flattening and spreading. The centering is achieved by aligning the axis with the center axis of the sealing device.

The bottom preform is completed by squeezing the bottom of the tube container flat with the clamp jig of the sealing device in a state where the centering pin has flattened the spread out portion and centered. At this time, since the projecting width of the centering pin is smaller than the height width of the projecting sill, the centering pin and the clamp jig that have entered the projecting sill will not interfere with each other.

When the preforming of the bottom portion by the clamp jig is completed, a pair of centering pins are returned close to each other so that the catch with the output white portion is eliminated, and the output white portion is set by the operation of the assembly function portion. The function part and the centering function part are lifted and separated from the output white part, so that the sealing of the output white part by the sealing device can be performed.

According to a fifth aspect of the present invention, in the fourth aspect of the present invention, the abutment plate of the output white setting function section is divided into a fixed-side abutment plate and a movable-side abutment plate, and the centering function is provided on the movable-side abutment plate. Since both centering pins are attached, the positional relationship between the end plate and the centering pin, especially the amount of centering pin protruding from the bottom surface of the plate, is always maintained at a constant value and pressed against the end plate. Then, since the flattened ends of the projecting shiro which are pushed and spread by the centering pins are not rubbed against the abutting plate and displaced, the flat pushing and spreading deformation of the projecting shiro is suitably achieved.

According to a sixth aspect of the present invention, the spread width dimension can be reduced even if the displacement stroke of the centering pin is the same by simply switching and changing the mounting position of the centering pin with respect to the moving side end plate in the fifth aspect of the invention. Since it can be increased or decreased, it can be used as it is for tube containers having different diameters.

[0031]

An embodiment of the present invention will be described below with reference to the drawings. 1 and 2 show the entire bottom preforming apparatus 1 according to the present invention.
A top table 18 which is immovably fixed and serves as a base body of the entire apparatus, and a base block 1 which is attached to a front end of an upper surface of the top table 18 so as to be adjustable in front, rear, left and right.
9, an elevating cylinder 20 attached to the front surface of the base block 19 so as to be vertically movable, and an elevating cylinder 2
And a slide plate 22 fixed to the tip of the piston rod 0 via a connecting plate 21 so as to be displaceable up and down, and an output white setting function unit 2 detachably attached to a front surface of the slide plate 22 by a detachable handle 25, and a centering function. And a mounting plate 23 for mounting the part 5.

Output white setting function unit 2 for mounting plate 23
The structure for mounting the centering function unit 5 is as follows.
3, a support table 24 extending forward from the lower front end,
It is composed of a supporting back plate 26 in which the mounting plate 23 is extended downward as it is, and a pair of supporting frame columns 27 which are suspended from the front edge of the supporting table 24.

(Hereinafter, refer to FIG. 3 to FIG. 6 in particular.) The output sill setting function section 2 is divided into front and rear parts, and a pair of fixed side end plates 3 a fixed to the lower ends of the support back plate 26 and the support frame column 27. And a pair of moving-side end plates 3b fixed to the slide piece 7 of the centering function unit 5 with the front end portion divided into right and left and having a reduced front-rear width positioned between the two fixed-side end plates 3a. It is provided on the base block 19 of the functional unit 17, and by adjusting the assembling height position of the elevating cylinder 20 with respect to the base block 19,
And a height position adjustment handle 4 (see FIG. 2) for adjusting and setting the height position of the lower surface of the end plate 3.

The centering function unit 5 is provided with the moving-side end plate 3
b, a pair of centering pins 6 projecting and fixed to the lower surface, and a guide rail 9 fixedly supported between the supporting back plate 26 and the supporting frame column 27 in a posture extending horizontally to the left and right as a flat direction.
A pair of slide pieces 7 slidably attached to the guide rail 9 in a suspended manner; and a pair of slide pieces 7
And a moving function part for moving the same synchronously along the guide rail 9 at a constant speed.

The moving function portion of the centering function portion 5 includes an opening / closing cylinder 13 fixed on a support table 24 and a support back plate 26 supporting a central portion bent in a U-shape by a fulcrum pin 12.
And a pair of opening / closing links 10 disposed back and forth with a guide rail 9 interposed therebetween. Transmission pin 1 provided on pin block 14 fixed to the tip (lower end in the figure) of piston rod 13
5 is slidably engaged, and a connecting pin 8 fixed to the slide piece 7 is slidably engaged with a vertically long slot 11 provided at the lower end.

When the open / close cylinder 13 is operated from the state shown in FIG. 3 to lower its piston rod, the open / close links 10 are pushed down at their upper ends by the transmission pins 15, and
As shown in a two-dot chain line in FIG. 3, the lower end portions are simultaneously displaced away from each other at a constant speed by using the fulcrum pin 12 as a fulcrum. The slide piece 7 separates at a constant speed synchronously along the guide rail 9, so that the combination of the moving-side butting plate 3 b fixed to the slide piece 7 and the centering pin 6 synchronously separates at a constant speed. Will move.

Reference numeral 16 denotes a stroke amount adjustment of the piston rod of the opening / closing cylinder 13, that is, both open / close links 1
The opening / closing amount adjusting nut, which is set by adjusting the opening / closing amount of 0, finely adjusts the amount by which the centering pin 6 pushes out the expanding white portion T2 by the opening / closing amount adjusting nut 16.

As shown in FIG. 6, a plurality of (four in the illustrated embodiment) mounting holes 3c are provided in the lower surface of the moving-side end plate 3b along the flattening direction. Then, a mounting hole 3c suitable for the diameter dimension is selected and the centering pin 6 is mounted.

Furthermore, it goes without saying that the lower surfaces of the fixed-side butting plate 3a and the moving-side butting plate 3b are located on a single imaginary horizontal plane. The bisecting points of the centering pins 6 are set so as to be located on the center axis M of the sealing device set by the clamp jig 28 of the sealing device.

The preforming of the bottom portion T1 according to the present invention includes a descending standby step A, a pushing step B, a pushing step C,
Push-out step D, crushing step E, and closing return step F
And the ascending / leaving step G are sequentially performed.

In the descent standby step A in which the end plate 3 of the output white setting function unit 2 is positioned at the lower limit by the lifting cylinder 20 of the assembly function unit 17, as shown in FIGS. The lower surface thereof is positioned on the clamp shaft 28 at a distance equal to the height and width of the set white portion T2, and the both end plates 3b are located close to each other.

In the case of the illustrated embodiment, as is apparent from FIG. 8, the distance between the centering pins 6 is different from the bottom T1 of the tube container.
Has a value substantially equal to the diameter of the opening.

FIGS. 10 to 12 show the pushing step B and the pushing-up step C.
The bottom T1 is opened by pushing up the bottom T1 while being guided by the guide plate 29 attached to the clamp jig 28 between a pair of clamp jigs 28 set at an interval smaller than the diameter dimension. As shown in FIG. 11, the end is deformed into a substantially elliptical shape elongated in the flattening direction, and the upper end edge of the bottom portion T1 abuts against the lower surface of the plate 3 in the push-up process C, thereby setting the output white portion T2. A pair of centering pins 6 are located in the whiteout portion T2.

That is, by deforming the opening end of the bottom portion T1 into a substantially elliptical shape elongated in the flat direction by using the clamp jig 28, the centering pin 6 is inserted into the formed whiteout portion T2. In addition to increasing the certainty of intrusion, the position of the clamp jig 28 relative to the upper end (opening end) of the bottom T1 suppresses the occurrence of unauthorized displacement when the bottom T1 is pushed up, and furthermore, the opening of the bottom T1. Is deformed into a substantially elliptical shape, thereby increasing the mechanical strength against the pushing force of both ends (ends in the flat direction side) having a small radius of curvature, and thereby, at the time of the pushing-up process C, defective deformation occurs at the upper end of the bottom portion T1. Effectively prevent it from occurring.

When the setting of the output white portion T2 is completed in the pushing-up process C, the opening / closing cylinder 13 of the centering function portion 5 is opened.
Is operated to synchronously move the pair of centering pins 6 away from each other at a constant speed, thereby performing a step D for expanding the whiteout part T2 shown in FIGS. 13 to 15 to center the whiteout part T2. In a state where it is spread flat.

When the spreading step D is completed, the pair of clamp jigs 28 as shown in FIG. 16 to FIG. Crushing step E of the bottom portion T1 is performed.

In the squeezing step E of the bottom portion T1 by the clamp jig 28 of the sealing device, the projecting white portion T2, that is, the bottom portion T1 which has been flattened and expanded in the state of being centered by the expanding step D, is directly viewed from the front and rear. Since it is only squashed, the projecting white portion T2 squashed and held flat by the clamp jig 28 is centered with respect to the sealing device.

When the exit white portion T2 is held on the sealing device side in the crushing step E, the opening / closing cylinder 13 of the centering function portion 5 is reversely operated, and as shown in FIGS. A closing / returning step F for bringing the centering pins 6 closer to each other is performed to release the centering pins 6 from being caught on both ends of the flattening side T2 of the projecting white portion T2.

When the catch between the centering pin 6 and the projecting white portion T2 is released in the closing / returning step F, the lifting cylinder 20 of the assembling function unit 17 is reversely operated, as shown in FIGS. 21 and 22. Then, an ascending / leaving step G for raising and displacing the centering pin 6 and the butting plate 3 is performed, thereby achieving complete separation of the centering pin 6 and the butting plate 3 from the exit white portion T2.

[0050]

Since the present invention has the above-described structure, the following effects can be obtained. According to the invention of claim 1 of the present invention, since the exit sill formed in the seal portion is set by the mechanical abutting operation of the opening edge of the bottom of the tube container, the setting and formation of the exit sill is simple and easy. Since the push-up operation for setting the output white portion directly uses the push-up operation of the centering operation, a significant simplification of the bottom preforming processing operation can be achieved.

Since the flattening and spreading of the projection white portion by the pair of centering pins is achieved by pulling the both ends of the projection white portion by the centering pins in the lateral direction, the height of the projection white portion is adjusted. There is no danger of a vertical force being disturbed, and flattening and spreading processing can be achieved while maintaining high dimensional accuracy of the sill.

Since the pair of centering pins penetrates into the projecting white portion at a projecting height within the height dimension range of the projecting white portion,
Even when it is positioned inside the output white part, there is no mechanical interference with the clamp jig of the sealing device. It can be crushed and held, and the flat preform of the bottom can be achieved in a state where it is centered with high precision.

According to the second aspect of the present invention, the pair of centering pins can be reliably inserted into the output white portion only by pushing up the bottom portion, whereby the processing can be simplified and the pair of centering pins can be simplified. The centering operation of the output white part by the movement of the centering pin can be easily, accurately and promptly achieved.

According to the third aspect of the present invention, when the bottom is pushed up, the clamping jig exerts a regulating force on the bottom, so that unnecessary displacement in the front-back, left-right, and right-hand directions is generated at the pushed-up bottom. Is effectively suppressed, thereby making it possible to obtain a suitable and stable lifting operation with respect to the bottom end abutting plate and the centering pin, and to set a large interval between the pair of centering pins. The flat push-out operation in which the projecting white portion is centered by the projecting pin can be achieved more quickly.

According to the fourth aspect of the present invention, since the bottom of the upper edge of the bottom is brought into contact with an abutment plate provided with a predetermined distance from the clamp jig immediately above the clamp jig, the projection is set. The shiro part can be directly set with reference to the clamp jig of the sealing device, so that accurate dimension setting of the shiro part can be easily achieved.

The centering mechanism for flattening and expanding the output white part in a state where it is centered has a structure in which a pair of centering pins are synchronously moved away from each other at a constant speed. Therefore, it is not necessary to confirm the positions of the centering pins, and the structure of the functional configuration for moving the centering pins for centering can be simplified.

[0057] Since the output white setting function unit and the centering function unit are assembled to the assembling function unit so as to be vertically movable, the sealing can be performed without changing the combination positional relationship between the output white setting function unit and the centering function unit. Both the functional units can be attached to and detached from the apparatus, so that the detachment from the output white part and the return to the standby state can be achieved quickly and stably.

According to the fifth aspect of the present invention, since the centering pins of the centering function section are mounted and fixed on the moving side abutting plate of the whitening setting function section, both the centering pin and the centering pin contacting the whiteout section. Can be integrally displaced without changing the mutual positional relationship, thereby achieving a significant simplification of the combination configuration of the abutment plate and the centering pin, as well as the improper displacement of the output white portion at the time of flattening and expanding deformation. The occurrence can be completely eliminated.

According to the sixth aspect of the present invention, only by changing the mounting position of the centering pin with respect to the moving side end plate,
It is possible to respond to the change in the diameter of the tube container easily and properly without changing the other device parts, so that it is possible to respond quickly, easily and accurately to the change in the diameter of the tube container. it can.

[Brief description of the drawings]

FIG. 1 is an overall front view showing an embodiment of a bottom preforming apparatus according to the present invention.

FIG. 2 is an overall side view of the embodiment shown in FIG. 1;

FIG. 3 is a front view of a main part in the embodiment shown in FIG. 1;

FIG. 4 is a side view of a main part in the embodiment shown in FIG. 1;

FIG. 5 is a bottom view of a main part in the embodiment shown in FIG. 1;

FIG. 6 is a perspective view showing a configuration example of a moving-side end plate in the embodiment shown in FIG. 1;

FIG. 7 is a front view of an essential part showing a descent standby step according to the present invention.

FIG. 8 is a plan view showing the positional relationship of the main parts during a descent standby step.

FIG. 9 is a side view of the main part showing the same during a descent standby step.

FIG. 10 is a front view of a main part showing a pushing step and a pushing step of the present invention.

FIG. 11 is a plan view showing the positional relationship of the main parts during the pushing step and the pushing-up step.

FIG. 12 is an essential part side view showing a pushing step and a pushing-up step.

FIG. 13 is a front view of an essential part showing the step of expanding the sheet according to the present invention.

FIG. 14 is an enlarged front view of a main part during the push-out step.

FIG. 15 is a plan view showing a positional relationship of a main part in the pushing and spreading step.

FIG. 16 is a front view of an essential part showing a crushing step of the present invention.

FIG. 17 is a plan view showing the positional relationship of the main parts during the crushing step.

FIG. 18 is a side view of a main part showing a crushing step.

FIG. 19 is a front view of an essential part showing a closing return step of the present invention.

FIG. 20 is a plan view showing the positional relationship of the main parts during the closing return step.

FIG. 21 is a front view of an essential part showing the ascent / detach step of the present invention.

FIG. 22 is a plan view showing the positional relationship of the main parts during the ascent / descent process.

[Description of Signs] 1; Bottom Preforming Device 2; Outlet White Setting Function Unit 3; End Plate 3a; Fixed End Plate 3b; Moving End Plate 3c; Mounting Hole 4; Height Position Adjusting Handle 5; Centering Function Portion 6; Centering pin 7; Slide piece 8; Connecting pin 9; Guide rail 10; Opening / closing link 11; Slot 12; Support pin 13; Opening / closing cylinder 14; Pin block 15; Transmission pin 16; Assembling function part 18; Top table 19; Base block 20; Lifting cylinder 21; Connecting plate 22; Slide plate 23; Mounting plate 24; Support table 25; Detachable handle 26; Support back plate 27; Support frame post 28; Tool 29; Guide plate M; Center axis T1; Bottom part T2; Spill-out part A; Lowering standby step B; Push-in step C; Push-up step D; Push-out step E; Crushing step F; Close-return step G;

Claims (6)

[Claims] 1. A preforming method in which an upper end of the bottom (T1) is crushed flat prior to sealingly sealing a bottom (T1) of the synthetic resin tube container, wherein the bottom (T1) comprises: By pushing up and intruding between a pair of clamp jigs (28) of the sealing device, an abutment part (T2) formed into a seal part is projected onto the clamp jig (18) by abutting, and In (T2), a pair of centering pins (6) enter the intruding position within the height dimension range of the projecting white portion (T2), and then the pair of centering pins (6) are attached to the pair of clamps. By displacing the jig (28) in a flattening direction perpendicular to the crushing direction, the upper end of the bottom (T1) including the projecting white portion (T2) is flattened and spread, and the bottom (T1) The centering of the sealing device is achieved, and from this state the clamp jig (28)
After flattening and holding the bottom portion (T1), the centering pin (6) is closed and returned, and the outgoing white portion (T2) is closed.
A method of preforming the bottom of a tube container that is lifted and removed from the inside. 2. A pair of centering pins (6) are fixed to a clamp jig.
(28) Insert the center axis (M) of the sealing device at an interval smaller than the flat inner diameter width of the projection white part (T2) protruding from the space, and at the bisecting point between both centering pins (6). 2. The method for preforming a bottom portion of a tube container according to claim 1, wherein the tube portion is positioned and arranged so that the spread-out portion (T2) is pushed and spread by synchronously separating the centering pins (6) at a constant velocity. 3. When the bottom (T1) is pushed up and intruded between a pair of clamp jigs (28), the pair of clamp jigs (2
3. The method for preforming a bottom portion of a tube container according to claim 1, wherein the interval of (8) is smaller than the outer diameter of the bottom portion (T1), and the flat cross-sectional shape of the bottom portion (T1) is crushed into a substantially elliptical shape. 4. A flat lower surface directly above a pair of clamp jigs (28) of the sealing device, against which an upper edge of a bottom (T1) of a tube container protruding and intruding between the clamp jigs (28) abuts. The distance between the lower surface of the abutment plate (3) and the upper surface of the clamp jig (28) is set to a value equal to the height and width of the forming sill (T2). At an interval smaller than the inner diameter width in the flat direction of the projecting white portion (T2) protruding from between the clamp jig (28) and the pair of clamp jigs. Tools (28)
The center axis (M) of the seal device located at the center of the pair is arranged along the flat direction with the bisecting point as the bisecting point, and the height and width of the projecting white portion (T2) from the lower surface of the end plate (3) A centering pin (7) projecting at a height that is smaller than, but protruding from, the height of the upper edge of the sill (T2). 5) and an assembling function section (17) that assembles and holds the output white setting function section (2) and the centering function section (5) so as to be vertically movable. . 5. A stop plate of an output white setting function section (2).
(3) is fixedly attached to the assembling function part (17) by the fixed end plate (3a) and the centering pin (6) of the centering function part (5).
5. A preform forming device for a bottom portion of a tube container according to claim 4, wherein the device is mounted in a position protruding from the lower surface, and comprises a centering pin (6) and a moving-side end plate (3b) which moves integrally. 6. A plurality of attachment points for the centering pins (6) of the centering function part (5) with respect to the moving-side end plate (3b) of the whiteout setting function part (2) are provided along the flat direction. Claim 5
A bottom preforming apparatus for a tube container as described in the above.