JPS5822347B2 - Container manufacturing equipment - Google Patents

Description

Detailed Description of the Invention This invention provides a method for manufacturing paper can containers, paper cups, etc., in which the inner cutting opening of the joined and overlapping part of the main body structure made of base paper whose surface has been treated to make it moisture resistant is exposed to the inside of the container. The present invention relates to an apparatus for producing containers that can be folded back to prevent them from being damaged.

Conventionally, in a paper container, if the cut opening of the base paper in the main body of the container is exposed inside the container, even if the surface of the base paper has been treated with a synthetic resin film or aluminum foil to resist liquids, etc., the liquid inside the container may leak. There is a drawback that the container may be damaged or the contents may leak by seeping through the cut opening of the base paper.

On the other hand, for example, the first and second
As shown in the figure, one is known in which one side end of the joint part a of the main body structure is folded back to the outside so that the paper cut opening is not exposed inside the container A.

However, in this configuration, the productivity of the container is extremely troublesome because the side end part of the joint part is folded back to the outside, and in the conventional example, the joint part a is sealed between the joint part a and the counter mandrel using a seam clamp. In addition to the steps involved, there were also a number of cumbersome steps involved.

In view of the above, the present invention relates to a container manufacturing apparatus in which the folding process C can be simultaneously performed via the seam clamp mechanism in response to the body joining by seam clamps, and the folding part is Container base paper is used which is provided with folds in advance so that it can be folded outward.

This will be explained below with reference to the illustrated embodiment. Reference numeral 1 denotes a mandrel for forming the container A;
The base paper 2 forming the seam can be fed with the opening 2' toward the seam clamp 3.

4.4 is a container molding holder which corresponds to the mandrel 1 and can be brought into contact with the outer periphery of the mandrel in a mutually openable/closable manner, and both holders are in a relationship such that the mandrel 1 can be held around the support shaft 5.

As shown in FIGS. 3 and 4, the seam clamp 3 has a seam surface 3b of a clamp main body 3a having a pressure contact surface corresponding to the container wall surface, and has a plurality of pin-shaped protruding rods 6 arranged in the vertical center. , each of these protruding rods is always protruded forward by a spring 7 built into the seam clamp 3.

The mandrel 1 fixed to the frame 8 and the opposite seam clamp 3 are connected to an operating rod 11 via an arm 9, a rod 10, etc., and the operating rod 11 is connected to the frame 8'.
The seam clamp 3 faces the cam 13 by means of a spring 12 mounted between the seam clamp 3 and the cam 13 so that the seam clamp 3 can press against the mandrel 1 in opposition to the cam 13.

Note that the above contact pressure is applied when the tip of the protruding rod 6 is placed on the mandrel 1.
After contacting the surface, the protruding rod 6 is pushed into the seam clamp main body 3a against the spring 7, and the seam surface 3b of the seam clamp main body presses against the mandrel 1 surface, pressing the joint part a of the base paper 2.

Next, referring to the manufacturing apparatus of the present invention, the base paper 2 is in the form of a container body in advance, and is fed to the mandrel 1 as shown in FIG. Wrap the base paper 2 around the mandrel 1 using a holder 4°4.

In this state, the protruding rod 6 of the seam clamp 3 is parked at a position slightly away from the mandrel 1 as shown in the same figure.
The base paper 2, which is sequentially formed into a container shape by the holders 4, 4, has both end portions b and b' brought into contact with the protruding rod 6 while being guided by the protruding rod 6, and is stopped by one of the holders in relation to the position of the supplied base paper. The side edges of the base paper pressed by the chrysanthemum are guided so as to be folded outward along the creases, so that the folding process C is easily performed.

Therefore, this folding process C is performed as shown in FIG. 6 by the guidance of the protruding rod 6 due to the proximity of the seam clamp in response to the mutual approach of the overlapping parts b and b' of both side ends of the base paper 2 due to the interlocking action of the holders 4 and 4. As shown in CL, as the molding of the holders 4 and 4 progresses, the folding process C
In the process where the part comes off the tip of the protruding rod 6 and reaches the mandrel 1 side, it is not reversed in the folding direction by engagement with the tip of the protruding rod 6 as shown in c2 in FIG. and the other side end b' of the container slides on the surface of the protruding rod 6 and overlaps the thin soil at the folded side end as shown by the chain line 2a.

To explain the operation of this process in more detail, see Figures 3 and 7.
As is clear from the drawings, both ends of the container base paper forming the overlapping joint at the side end of the container are not of the same length and close to the protruding rod 6 of the seam clamp 3, but rather at one end. The cutting edge, which is the end where the folded portion C is to be formed, extends longer than the other cutting edge b', so even if the holders 4 and 40 are engaged at the same time, the other edge The cut end at one end, which is longer than the other end, contacts the protruding rod 6 of the seam clamp 3 earlier than the other end, and because of its length, it contacts the protruding rod more strongly.

Therefore, by the guidance of the protruding rod 6, one end is bent outward to form a folded portion C and reaches the mandrel side first, as shown in FIGS. 6 and 7.

Since the cut end b' of the other end that comes into contact with the protruding rod 6 later is short, it makes a light contact and is inserted between the protruding rod 6 of the seam clamp 3 and the mandrel 1 without folding. Then, the folded portion C is overlapped to form a bonded portion of the container.

This is as shown in FIG.

Then, after this, when the seam clamp 3 moves forward in the mandrel direction by the operation of the operating rod 11 side, the overlapping joint part a is pressed against the mandrel 1 with the tip of the protruding rod 6, and the retracting clamp body 3a of the protruding rod 6 is pressed. As it moves forward, the seam surface 3b comes into contact with the joint part a and seals the part by pressure (see FIG. 9).

In the above, it is assumed that an appropriate adhesive is applied in advance to one of the joint surfaces of the container joint part a during the process of making the base paper.

FIG. 10 is an explanatory diagram of the operation of the seam clamp 30 according to another embodiment. In this case, the operation of bringing the seam clamp 30 close to and crimping the mandrel 1 is carried out in three stages, such as a retreating stage 11, an approaching stage (2), and a crimp stage (2). One side edge of the overlapping joint part of the base paper 2 is pressed in a stepwise manner, and in the process of press-forming the base paper on the mandrel side with the holder as shown in the figure (■) using the side surface of the seam clamp 30, which has the same effect as the conventional example. This figure shows the relationship in which the folding process C can be formed on the side.

Even in this case, one end to be folded is kept longer than the other end in exactly the same way as when using the protruding rod 6, and the protruding rod 6 described above is kept longer than the other end.
The role of is performed by the side surface of the seam clamp 30 in the state of proximity stage (3), and produces exactly the same result.

In other words, the approach step (3) of the seam clamp 30, indicated by a solid line in FIG. 10, is no different from the function of the protruding rod 6.

Therefore, in this case, the seam clamp 30 is driven by the operation of the operating rod 11 by the cam 13 shown in FIG.
The step configuration is such that it can be performed in three stages as shown in I, n, and H in the figure.

In summary, in the present invention, in manufacturing a paper container, although the container body is formed by overlapping both ends of the base paper 2 in the depth direction of the container, the inner end portion of the joint part a is formed by the seam in the container forming process. Due to the movement relationship with the clamps 3 and 30, it is possible to fold back both ends of the container base paper and form the container part in one step, which simplifies the container manufacturing process and increases productivity. significantly enhanced.

Incidentally, in the above, a crease or the like that urges the folding is made in advance on the base paper before forming at the folded portion C position on the side of the base paper side.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway perspective view showing an example of a container molded by the present invention, Fig. 2 is an enlarged cross-sectional view of the same main part, and Fig. 3 is a plan explanatory view showing an embodiment of the container forming apparatus. , FIG. 4 is a perspective view of the same seam clamp as above, FIG. 5 is a side view of the outer path of FIG. It is the same explanatory view with a difference. 1... Mandrel, 2... Base paper, 3.
...Seam clamp, 3b...Sealing surface, 4...Holder, 6...Protruding rod, a
・・・・・・Overlapping part, b: End part on the container base paper side (for overlapping application), C: Folded part.

Claims (1)

[Scope of Claims] 1. A crease is formed in advance between the mandrel and a mutually openable/closable holder having an inner surface that matches the outer surface of the mandrel so that one of the overlapping joints at both ends of the container base paper can be bent outward. In the container manufacturing apparatus for supplying and overlapping the container base paper, there is provided a seam clamp having a pressure contact surface facing the mandrel and having a front surface corresponding to the container wall surface, at a position corresponding to the overlapping bonding part. A plurality of protruding rods are provided on the front surface of the seam clamp and can be stored in the seam clamp, and are protruded outward by a spring built into the seam clamp. One end, which has been creased so that it is longer than the other end and can be bent outward by bringing the ends closer together, hits the protruding rod of the seam clamp before the other end. and, guided by the protruding rod, forms a folded part that is bent outward through the fold line and reaches the mandrel side, and the other end is inserted between the protruding rod of the seam clamp and the mandrel. manufacturing a container, in which a bonded portion of the container is formed by stacking the above-mentioned folded portion on top of the folded portion, and then the bonded portion is crimped with a seam clamp to form a stacked bonded portion. Device. 2. Between a mandrel and a mutually openable/closable holder having an inner surface that matches the outer surface of the mandrel, the container base paper is provided with a crease in advance so that one of the overlapping joints at both ends of the container base paper can be bent outward. In an apparatus for producing containers that are supplied and laminated, a seam clamp is provided at a position corresponding to the laminated joint portion, facing the mandrel and having a pressure contact surface whose front surface corresponds to the container wall surface, and the seam clamp The actuating rod connecting the two is braked by a cam, and the seam clamp is equipped with a cam mechanism that approaches the mandrel in stages such as a retreat stage 11, an approach stage (■), and a crimping stage (■). By the stepwise advancement of the mandrel and the interlocking action of the holder on the outer surface of the mandrel, both ends of the container base paper are brought closer to each other, and in the approach step (3) of the seam clamp, the end is longer than the other end and bent outward. One end that is creased so as to abut the side of the seam clamp before the other end, forming a fold that is folded outward through the crease to the mandrel side. The other end is inserted between the seam clamp and the mandrel, and the container is stacked on top of the folded part, and the seam clamp is used to press the bonded part of the container to form an overlapping joint. Apparatus for manufacturing containers made as follows 0