JP2006016064A - Pillow packaging machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pillow packaging machine for center sealing even when a film width is not larger than the total of a merchandise peripheral length and 40 mm, which can stably realize good package finishing. <P>SOLUTION: This pillow packaging machine is provided with a transfer means 12 for transferring an item 11 to be packaged, a packaging film supplying means for supplying a packaging film 13 from the upper side of the item, a film end guide means 15 for holding both ends of the film supplied to guide them to the underneath of both sides of the transfer means, a triangle guide plate 16 for moving the item whose top is covered with the film, a pair of bag making belts 17 positioned on both sides of the guide plate, a center seal roll 18 for mutually pressure bonding the belts in front of the guide plate, and a guide roll 19 for holding in the two ends 13a of the film 13 sticking out underneath from the belts 17 in a stretched state. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a pillow packaging machine, and more particularly to a horizontal pillow packaging machine that continuously wraps an object to be packaged such as food with a packaging film (including a packaging sheet).

  Traditionally, in-stores such as supermarkets, food processors, vendors, etc., put fruits, meat, fresh fish, prepared vegetables, cooked rice in lightweight trays or containers with lids, and wrap the whole with a stretch film (wrapping film). Prepackaged packaging forms are widely used. These packaging methods include a manual method using a dedicated workbench-type packaging machine called a handler upper, and food is automatically packaged by setting a film and placing a tray, and depending on the model, weighing is possible. It can be roughly divided into packaging methods using automatic packaging machines that automatically perform labeling and labeling.

  Furthermore, automatic packaging machines are classified into a type called a pillow method and a type called a push-up type. Among these, the pillow type packaging capacity is higher than the push-up type, and because it can wrap a large number of products of the same size at a high speed, it is suitable for use in processing distribution centers such as supermarkets. Although it does not reach the push-up type, the quantity of one unit is much higher than the push-up type. At present, in order to reduce production costs, it is possible to obtain a good packaging state with a narrower film width and packaging stability in a pillow-type automatic packaging machine at a packaging center. It is an extremely important quality requirement for both films.

  In general, the pillow type automatic packaging machine includes a conveying means for placing and conveying an article to be packaged, a packaging film supply means for continuously supplying a packaging film from above the article to be packaged, and a supplied packaging film. A film end guide means for gripping both ends of the film and guiding it downward on both sides of the conveying means, and an object to be packaged which is conveyed by the conveying means and whose upper portion is covered with the packaging film is placed and moved. A triangular guide plate whose front end side in the traveling direction is narrowed; a pair of bag-making belts arranged on both sides of the triangular guide plate to guide both end sides of the packaging film along the lower surface of the package; and the triangular guide plate A center seal roll that press-bonds the pair of bag making belts in front is provided (for example, see Patent Document 1).

In addition, as a stretch film used in a pillow packaging machine, conventionally, a film made of polyvinyl chloride has been mainly used. This is because the packaging efficiency is good, the packaging finish is beautiful, etc., the bottom sealability after packaging and the state change such as peeling during transportation and display are few and the product value does not deteriorate This is because it has an advantage.
JP-A-8-91307

  However, in recent years, elution of hydrogen chloride gas generated during incineration and contained plasticizers has been regarded as a problem for polyvinyl chloride stretch films. Furthermore, new food hygiene issues such as the detection of trace amounts of chemical substances corresponding to environmental hormones are increasingly being taken up. On the other hand, various material configurations for replacing the stretch film made of polyvinyl chloride have been studied, and in particular, many configurations of stretch films using polyolefin resins have been proposed and put on the market. This polyolefin-based stretch film has improved in quality over the past few years compared to its initial market, and various improvements have been made so that a good packaging finish can be obtained with both automatic packaging machines and polyolefin-based films. It has been added. As a result, over the past few years, polyolefin films have greatly expanded their market share as a whole.

  However, when viewed individually, the quality of polyolefin film is close to that of polyvinyl chloride film due to problems such as the balance with manufacturing costs, but the combination of film, packaging machine, and product (package) In some cases, the required quality cannot be clearly satisfied. As an example of the required quality that cannot be satisfied, it is said that a pillow packaging machine is generally unable to wrap without being able to perform center sealing of a polyolefin film unless there is a film effective width of 40 mm or more in product circumference. Moreover, even if the center seal can be performed, there is a problem that the center seal is not stable in a temporary state and the center seal cannot be performed during the work.

  Many of the causes of the quality difference due to the material of the stretch film are due to the difference in physical properties such as the elongation characteristics and the restoring behavior of the film due to the difference in the raw material resin used. As a specific example, in order to widen the effective width of the film to wrap goods, the film is stretched in the lateral direction by grasping both sides of the film to apply a tensile stress, and then the film is center-sealed. In addition, the restoration behavior when the grip of the film is released is generally instantaneous for polyolefin-based films.

  Therefore, the film is released from the film gripping jig (film end guide means) for winding the film, and returned to its original state before being center-sealed, and the effective width of the film was widened in advance before center sealing. The effect will be lost and the center seal will no longer be possible.

  In order to improve the center seal failure, the effective width of the first film must be wide. In the processing and distribution center, since several kinds of products are packaged with one kind of film width, a film width of about maximum product circumference +90 mm to minimum product circumference +40 mm must be used. However, if the product is packaged using a film that is 90 mm wider than the product circumference, the excess film at the center seal will form a string, causing the packaging finish to deteriorate, and a wide film. The problem is that the cost increases.

  Accordingly, an object of the present invention is to provide a pillow packaging machine that can perform center sealing even when the film width is equal to or less than the product circumference +40 mm and can stably obtain a good packaging finish.

  In order to achieve the above object, the pillow packaging machine of the present invention is supplied with conveying means for placing and conveying an article to be packaged, and packaging film supply means for continuously supplying the packaging film from above the article to be packaged. A film end guide means for gripping both ends of the packaged film and guiding it downward on both sides of the transport means, and an object to be packaged that is transported by the transport means and whose upper portion is covered with the packaging film is placed. A triangular guide plate whose leading end side in the traveling direction is narrowed, a pair of bag making belts arranged on both sides of the triangular guide plate to guide both end sides of the packaging film along the lower surface of the package, and the triangle In a pillow packaging machine provided with a center seal roll for crimping the pair of bag making belts in front of a guide plate, both ends of the packaging film protruding below the bag making belt are held. A pair of guide rolls are provided, and the guide rolls are provided at a position less than 200 mm from the center point of the center seal toward the upstream side in the packaging film traveling direction, and the axis of the guide rolls is in the traveling direction of the bag making belt. On the other hand, it is characterized by being arranged in a range of 70 to 90 degrees in the horizontal direction and 30 to 70 degrees with respect to the vertical direction.

  Further, the guide roll is a free-rotating adhesive roll having an adhesive layer on the outer peripheral surface to which the packaging film adheres.

  According to the pillow wrapping machine of the present invention, the film can be stretched in the width direction until the center seal is performed by the guide roll, and a tensile stress can be applied to the film. However, the center seal can be reliably performed, and a good packaging finish can be obtained at low cost. Further, by using an adhesive roll as the guide roll, it is possible to easily reduce production costs and cope with existing machines. Furthermore, a more reliable center seal can be performed by arranging the guide roll as close as possible to the center seal roll. Further, by setting the rotation axis of the guide roll to the angle range, a tensile stress can be automatically applied to the film as the packaging film moves.

  1 is a plan view of a pillow packaging machine showing an embodiment of the present invention, FIG. 2 is a side view of the same, FIG. 3 is a partial cross-sectional plan view of the main part, and FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 5 is a cross-sectional view taken along line VV in FIG. 1, FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. 1, and FIG. 7 is a cross-sectional view taken along line VII-VII in FIG.

  This pillow wrapping machine is a center seal device that includes a transport means 12 for placing and transporting a product (packaged article) 11 and a packaging film supply means 14 for continuously feeding a packaging film 13 from above the packaged article 11. A pair of film end guide means 15 and 15 for holding the both ends 13a of the supplied packaging film 13 and guiding them downward on both sides of the conveying means 12; A triangular guide plate 16 having a narrowed front end side in the advancing direction in which the article 11 covered with the film 13 is placed and moved, and a triangular guide plate 16 disposed on both sides of the triangular guide plate 16 so as to cover both ends of the packaging film 13 are covered. A pair of bag making belts 17 and 17 for guiding along the lower surface of the package 11, and a pair of bag making belts 17 and 17 that are crimped to each other in front of the triangular guide plate 16. A pair of center seal rolls 18, 18 and a pair of holding both ends 13 a, 13 a of the packaging film 13 that protrudes downward from the bag making belts 17, 17 below the bag making belts 17, 17. Guide rolls 19 and 19 are provided.

  The bag making belt 17 is stretched over the first center seal roll 18 and the pulley 20 so as to move along the outer edge of the bag making plate 21, and the upper surfaces of the bag making belt 17 and the bag making plate 21. Is set substantially flush with the upper surface of the triangular guide plate 16. A second center seal roll 22 is provided next to the first center seal roll 18. In addition, since the conventional end seal device provided downstream from the center seal device can be applied as it is, its illustration and detailed description are omitted.

  The guide roll 19 is installed so as to freely rotate with the movement of the packaging film 13, and an adhesive layer having adhesiveness to the packaging film 13 is provided on the outer peripheral surface thereof. The pressure-sensitive adhesive layer is formed to have an appropriate pressure-sensitive adhesive strength that does not hinder the progress of the packaging film 13, and is subjected to surface processing according to the type of the packaging film 13, or a means such as attaching another material. Can be formed as appropriate. By using such an adhesive roll, the end 13a of the packaging film 13 can be expanded in the lateral direction with one adhesive roll, and the lateral direction with the end 13a of the packaging film 13 sandwiched between the two rolls. The production cost can be reduced compared to the ones that are spread over.

  The rotation axis of the guide roll 19 is installed so as to be inclined such that the horizontal angle α with respect to the traveling direction of the bag making belt 17 is in the range of 70 to 90 degrees and the angle β with respect to the vertical direction is in the range of 30 to 70 degrees. ing. If the angle α in the horizontal direction is less than 70 degrees or exceeds 90 degrees, the end portion 13a of the packaging film 13 cannot be sufficiently spread in the lateral direction by the guide roll 19. Similarly, even if the angle β with respect to the vertical direction is less than 30 degrees or exceeds 70 degrees, the end portion 13a of the packaging film 13 cannot be sufficiently spread in the lateral direction by the guide roll 19. . In addition, when the adhesive roll is used as the guide roll 19 outside the both angle ranges, the packaging film 13 may not be reliably adhered to the guide roll 19.

  The length and diameter of the guide roll 19 are arbitrary and can be selected according to the conditions of the installation location in the pillow packaging machine. However, if the length is too short or the diameter is too small, the packaging film 13 The end portion 13a cannot be sufficiently expanded in the lateral direction. If the end portion 13a is too long or too large, the cost is increased. Therefore, the length of about 70 mm and the diameter of about 20 mm are usually appropriate.

  Moreover, the guide roll 19 is provided in the position where the distance L becomes less than 200 mm from the center point of the said 1st center seal roll 18 toward the upstream of a packaging film advancing direction. If the distance L between the guide roll 19 and the first center seal roll 18 is too long, the packaging film 13 will rebound and return to its original position when the end 13a of the packaging film 13 is separated from the guide roll 19. The effect of installing the roll 19 cannot be sufficiently obtained. Moreover, since installation will become difficult if it is too close to the 1st center seal roll 18, the range of 50-15 mm is suitable normally.

  Furthermore, during actual packaging, since the passing angle of the end portion 13a of the packaging film 13 is slightly different between when the article 11 is passed and when it is not passed, the end portion 13a of the packaging film 13 is reliably adhered to the guide roll 19. Therefore, it is preferable that the lower portion of the guide roll 19 is not fixed, and the guide roll 19 is formed so as to be able to follow an angle change when the film end portion 13a passes. Further, the upper portion of the guide roll 19 is preferably formed in a conical shape or a shell shape in order to make the contact with the packaging film 13 smooth.

  Further, since the interval of the bag making plate 21 is adjusted by the width of the article 11 to be packaged, the guide roll 19 is fixed to the lower portion of the bag making plate 21 and the interval of the guide roll 19 is adjusted simultaneously with the adjustment of the interval of the bag making plate 21. It is preferable to form it so as to be adjusted to an appropriate position.

  Thus, the guide roll 19 which consists of the small adhesion roll which has an adhesion layer in an outer peripheral surface is arrange | positioned under the bag making belt 17 and the bag making plate 21, and both ends of the packaging film 13 protruded below from the bag making belt 17 By forming 13a so that it is adhered to and held by the guide roll 19, the end 13a of the packaging film 13 that moves away from the upstream film end guide means 15 toward the first center seal roll 18 instantaneously returns. This can be prevented, and the stretched state of the packaging film 13 can be maintained until just before sealing.

  Thereby, even if it uses the packaging film 13 of the width | variety of the to-be-packaged object 11 +40 mm or less, for example, the width of a circumference +20 mm or less, a center seal defect does not arise and it can package stably.

  As a pillow packaging machine, an ST-7000 type automatic packaging machine manufactured by Omori Machinery Co., Ltd. was used. As the packaging film, a commercially available stretch film made of polyvinyl chloride (PVC) and a stretch film made of commercially available polyolefin (PO) were used. As a package, a tray made of polystyrene paper having a length, width and height of 200 mm × 200 mm × 20 mm and a circumference of 430 mm was used. In the end seal device, the tray length was cut by 160 mm.

Example 1
A guide roll having a length of 70 mm, a diameter of 20 mm, and a smooth outer peripheral surface plated with chrome to form an adhesive layer, the center point of which is 160 mm from the center point of the first center seal roll toward the upstream side in the packaging film traveling direction. At the position, the angle α was set to 80 degrees and the angle β was set to 50 degrees, and attached to the lower surface of the bag making plate. A wrapping film having a film width of 450 mm (tray peripheral length + 20 mm) was used.

Example 2
The mounting position of the guide roll was the same as in Example 1 except that the center point was 190 mm from the center point of the first center seal roll toward the upstream side in the packaging film traveling direction.

Example 3
The same as Example 1 except that the guide roll mounting angle α was set to 70 degrees.

Example 4
The same as Example 1 except that the guide roll attachment angle β was 30 degrees.

Comparative Example 1
The mounting position of the guide roll was the same as Example 1 except that the center point was 230 mm from the center point of the first center seal roll toward the upstream side in the packaging film traveling direction.

Comparative Example 2
It was the same as Example 1 except that the mounting angle α of the guide roll was set to 60 degrees.

Comparative Example 3
It was the same as Example 1 except that the mounting angle α of the guide roll was set to 100 degrees.

Comparative Example 4
The same as Example 1 except that the guide roll mounting angle β was 20 degrees.

Comparative Example 5
The same as Example 1 except that the guide roll attachment angle β was set to 80 degrees.

Comparative Example 6
Without providing a guide roll, one having a film width of 480 mm (tray peripheral length + 50 mm) and one having a film width of 530 mm (tray peripheral length + 100 mm) were used.

Table 1 summarizes the conditions and results in each example and each comparative example. From these results, a stable center seal is performed even when the film width is the product circumferential length +20 mm by installing a guide roll having an axis inclined to a specific angle range on the upstream side 200 mm of the first center seal roll. It can be seen that a good packaging finish is obtained.

It is a top view of the pillow packaging machine which shows one example of this invention. It is a side view similarly. It is a partial cross section top view of the principal part. It is the IV-IV sectional view taken on the line of FIG. It is the VV sectional view taken on the line of FIG. It is the VI-VI sectional view taken on the line of FIG. It is the VII-VII sectional view taken on the line of FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 ... Merchandise (to-be packaged object), 12 ... Conveyance means, 13 ... Packaging film, 13a ... Both ends of packaging film 13, 14 ... Packaging film supply means, 15 ... Film edge guide means, 16 ... Triangular guide plate, 17 DESCRIPTION OF SYMBOLS ... Bag making belt, 18 ... 1st center seal roll, 19 ... Guide roll, 20 ... Pulley, 21 ... Bag making plate, 22 ... 2nd center seal roll

Claims (2)

  Conveying means for placing and conveying the article to be packaged, packaging film supplying means for continuously supplying the packaging film from above the article to be packaged, and both sides below the conveying means by gripping both ends of the supplied packaging film A film end guide means that guides the film, a triangular guide plate that narrows the leading end side in the advancing direction for placing and moving the article to be packaged that is conveyed by the conveying means and whose upper portion is covered with the packaging film, A pair of bag making belts arranged on both sides of the triangular guide plate to guide both end sides of the packaging film along the lower surface of the package, and the pair of bag making belts are pressure-bonded to each other in front of the triangular guide plate. In a pillow packaging machine provided with a center seal roll, a pair of guide rolls are provided to hold both ends of the packaging film that protrudes below the bag-making belt. While being provided at a position less than 200 mm from the center point of the center seal toward the upstream side in the direction of travel of the packaging film, the axis of the guide roll is 70 to 90 degrees in the horizontal direction with respect to the direction of travel of the bag-making belt, and in the vertical direction. A pillow wrapping machine, wherein the pillow wrapping machine is disposed at an angle of 30 to 70 degrees.   The pillow packaging machine according to claim 1, wherein the guide roll is a free-rotating adhesive roll having an adhesive layer on the outer peripheral surface to which the packaging film adheres.

Images