JPH02500355A - improved packaging - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] improved packaging 4 Anal Powder Wataru The present invention provides an improved bag, particularly, but not limited to fresh meat and/or other Skin-wraps similar products and provides gas that helps maintain the quality of the packed products. The present invention relates to an improved filled bag.

Riho J” 6 columns 1 power Skin wrapping/backing is used to back products such as meat and It is a technology that bleeds out almost all of the air and/or gas surrounding the

The figure shows the form of puncture of plastic materials as described in PCT/AU86100339. vinegar. In this puncture, products 3 such as fresh meat, fish, poultry and/or vegetables are A base 1 of punctured plastic material is provided. This base 1 has a peripheral lip 5, and the top surface of product 3 is shown to be at a position lower than the lip 50 level. ing. A skin wrap plastic material 7 is placed on top of the product 3 and welded or otherwise to the peripheral lip 5 by a similar technique. Skin wrap 7 is below lip 5 The space between the base 1 and the skin 7 Eliminate substantially all air and/or gas from the plastic material lid 9 It is placed on the skin 7 and joins this lid to the Vegas 1 along the peripheral lip 5. Lid 9 A space 11 is created between the skin 7 and the skin 7. This space 11 contains the packed product 3. Fill with gas that promotes quality maintenance. In this regard, gas packs such as red meat For example, any one of 0□, N2, Cot that promotes product color and quality maintenance. or a combination thereof.

The plastic material of the base 1 and skin 7 may be transparent plastic material. can. Typically, press base 1 for PvC, skin 7 for PE/EVA, etc. at the same time. The outlet plastic and the lid 9 are made of a plastic material such as PVC/PR. base 1. The skin 7 and/or the lid 9 are multilayer webs, for example heat banks or It is also possible to perform suitable bonding such as thermal bonding by RF welding. and in particular selectively block and/or permeate gases through the skin web 7 You can choose to use plastic materials.

Packs of the type shown in Figures 1 and 2 are not entirely preferred. That is, The skin wrap 7 can be continuously maintained under tension to ensure that the product 3 is retained. This is because it cannot be done. Skin 7 of PE/EVA material will be removed from product 3 after a period of time. The problem is that the gas penetrates below the skin 7 after a period of time, and the This is exacerbated by the phenomenon that the differential pressures above and below the kin 7 become equal. Product in transit 3 This movement loosens the skin 7 and makes the pack look unsightly.

Matasatogo Mjo It is therefore an object of the present invention to provide an improved method of keeping the skin material in constant contact with the product under tension. You can get the pack you want.

The invention relates to plastic material packs for meat or other products. A base of plastic material, the meat or other product to be placed on this base, and said base. overlapping the meat or other product on the base and along the periphery of the base. a skin of plastic material bonded to the plastic bonded to the base along the periphery of said base to create a space between A lid made of packing material and a gas filling said space to enhance the quality maintenance of the packed product. compressing said meat or other product by said skin below said skin; holding the skin, and bonding the skin so that tension is applied to the skin; A nearly continuous tension is applied to the skin and the meat or other product is applied closely to the skin. It is characterized by keeping it in a wrapping relationship.

Furthermore, the present invention provides a method for manufacturing a pack, comprising: providing a base of plastic material; Place meat or other products on said base and place plastic on said meat or other products. Place the skin of the material, the meat or other product by placing the skin under tension over the meat or other product; compresses the other product and maintains the tension relationship with the skin along the periphery of the base. holding and bonding to said base; Above the skin, a lid of plastic material is coupled to the base to secure the lid. and the skin, forming a space between the skin and the skin; The space is filled with a gas that enhances quality maintenance of the packed product. , The skin is bonded and compressed by the skin against the meat or other product. This is achieved by maintaining the state of tension almost continuously by means of an outwardly directed force. It is characterized by.

In this method, meat or other products are added in the area where the bond is made between the skin and the base. This inwardly directed force forces meat or other similar products onto the bonding surface. It is best to move it away from the Furthermore, these inwardly directed forces A means of applying force inward to the pack by engaging the outermost surface of the skin against the product. It is better to make it occur more frequently.

Furthermore, according to the invention, a base part for skinning back the product for packing the product is provided. Skin wrapping material that can be skin wrapped and bonded to materials. In the heated platen of the wrapping machine, the platen is used to bond the skin wrapping material. a first part defining an area to be treated and a second part to perform skin wrapping; , move the platen towards the skin wrapping material to remove the skin wrapping material. This heats the area to be bonded to the bonding temperature and the area to be bonded is heated. Heat the area to skin wrapping temperature to perform thermal bonding and skin wrapping. and each area of the platen can be heated individually. , each part is equipped with automatic temperature control means, which can control the selected temperature of each area. make it possible to do so.

"lj" 11η scolding skin The invention will be explained in more detail with reference to the accompanying drawings, in which: FIG.

Figure 1 is a perspective view of a known plastic material bag, Figure 2 is the pack of Figure 1. The longitudinal sectional view of FIG. 3 is similar to FIG. 2 of a preferred example of the improved pack according to the present invention. A cross-sectional view of FIG. 4 is a detailed enlarged view of the side edge of the base of the embodiment shown in FIG. 3; Figure 5 is a similar enlargement to Figure 4 showing how to place the skin in tension. cross section, FIG. 6 shows the state of the base forming station during the stages of the preferred embodiment of the method of the invention. cross-sectional view, FIG. 7 is a cross-section of a skin wrapping station used in a preferred embodiment of the method of the invention. figure, FIG. 8 is a partially cutaway perspective view of a pack according to a different embodiment of the present invention; FIG. 9 is a longitudinal section of a skin wrapping station used in another embodiment of the present invention. side view, Figure 10 shows an enlargement of a part of the skin wrapping station at a different stage than in Figure 9. Large longitudinal section, FIG. 11 is a perspective view of a portion of the skin wrapping station of FIGS. 9 and 10; , Figure 12 is produced at the skin wrapping station in Figures 9, 10 and 11. FIG. 13 is a partially cutaway perspective view of the skin wrapping step shown in FIG. 9. Longitudinal section showing the simultaneous formation of three different packs with different orientations of the side view, FIG. 14 is a sectional view taken along line 14-14 in FIG. 13, and FIG. 15 is a sectional view of another embodiment. Longitudinal cross-sectional view of the Blue Steel Silane skin wrapping station, FIG. 16 is a diagram showing the heating platen of different embodiments, and FIG. 17 is a diagram showing the heating platen of different embodiments. A schematic cross-sectional view of the example platen, FIG. 18, is an enlarged view similar to FIG. 9 of the different embodiment. FIG.

Oka 1 Kansei nri FIG. 3 shows packs with the same reference numerals as the packs shown in FIGS. 1 and 2. In the embodiment of the invention shown in FIG. A second lip 13 is provided adjacent to and below the bottom portion 15. Preferably, the second Lip 13 is angled downward and inwardly as shown, but parallel to lip 5. You can also do that. The angle of inclination is preferably 45°. Skin 7 is the second lip 13. It is coupled to the innermost and lowermost sides indicated by reference numeral 17. This connection is a heat bank tie. Heat bonding, or thermal bonding, can be carried out using The lid 9 may be joined completely along the periphery of the lip 5 in the area 19. . This bonding is also performed for the skin 7 that overlaps the lip 5.

Base 1 is made of PVC/PE, skin 7 is made of LLDPE, and lid 9 is made of PVC/PE. Typically, it is manufactured by Base 1 should be 200-600 microns thick be able to. Skin 7 should be 10-100 microns thick and M9 should be 50-10 microns thick. It can be 0 microns thick. Product 3 is compressed by skin 7 and directed outward forces 21 are generated on the skin 7 and these forces 21 are to be retained on the skin 7. The skin 7 is brought into tension against the product so as to create a substantially continuous tension 23. this The tension changes slightly after a certain period of time, but more or less continuous tension is applied to the skin 7. The relationship shall be such that This tension acts to pull the skin 7 on the product 3 . A vacuum or subatmospheric pressure is created under the skin, and this pressure This helps keep the skin 7 in contact with the top surface of the product 3. Skin 7 on the underside of lid 9 The space 11 above accommodates gas that promotes quality maintenance of the packed product 3. Can be done. This gas may be Ot-Nt, or CO□, or a combination thereof. is common.

Other gases or combinations thereof can be used as required.

Figure 4 shows an enlarged detail of the pack lid area of Figure 3, as is clear from Figure 0. In addition, the lip 5 extends substantially horizontally and parallel to the bottom of the base 1. Lip 13 is It is inclined with respect to the bottom part 15. This angle of inclination is approximately 45°. lip 13.15 The upper side wall 27 in between slopes downwardly towards the bottom 15 of the base 1. lip 13 The lower side wall 28 below is similarly inclined downwardly. In a preferred embodiment, the lip The depth of the pack below the base 13 is changed at the time of forming the base 1, and to compensate for the different thicknesses of the products 3 to be packaged.

Therefore, the depth 29 is fixed and the depth 31 is variable.

The condition imposed on the base 1 is that the top surface of the product 3 meets the bottom of the lip 13 and the lip 15. In other words, it exists in the region between the two, that is, within the depth 29. In this way, When welding the kin 7 to the bottom of the lip 13, the necessary compressive force is applied to the product 3, causing tension. A force and stretching force 23 is created on the skin 7.

Figure 5 shows how the skin 7 moves when carrying out the pack manufacturing method. Show in detail. In this embodiment, the top surface of the product 3 is the bottom of the lip 13 and the lip The product 3 is loaded onto the base 1 so as to be located in the area between the base 1 and the base 1. Then plastic A skin 7 of locking material is placed in the opening at the top of the base 1 and held by retaining means (not shown). Hold it in the opening.

The air pressure in the chamber surrounding the base 1 (not shown in FIG. 5) is reduced. biased outward The elastic pressing presses the platen 33 having the member 35 onto the top of the base 1. , pushing the skin 7 downward into the base 1. The opening at the top of the base 1 is rectangular. In the case of a shape, a total of 4 pressing members 35 are provided, one on each side. . For pressing, a bead 37 is provided at the lowermost end of the member 35. Clamped platen 33 When pressed against the skin 7, the flexible and extensible skin 7 engages with the bead 37. and descends downward along the upper side wall 27. After this, the bead 37 is at the top of the lip 13. lip 1 on the side edge of the product 3 when moving downward past this part. This creates an inward force on the part that is above the bottom of the 3. In this way, product 3 is It is pushed inwardly against the lower side wall 28. When the platen 33 descends, the elastic For pressing, the member 35 is internally moved by sliding movement along the upper side wall 27 and the second lip 13. move towards The skin 7 is cut into the lowermost region of the lip 13 by a heated die member. The die member is pressed between the member 35 and the side wall 27. It can be pushed into the space 1. This point will be explained later. Do it like this Thus, air at a pressure lower than atmospheric pressure is sealed below the skin 7.

FIG. 6 shows the apparatus used to form the pair of bases 1. In this example and place the plastic material FEP into the pair of female die cavities 39. . Plastic material 1 may be PvC or PVC/PH or other similar material be able to. Typically the thickness can be on the order of 400 microns. Ru. This allows a relatively rigid structure of the base 1 to be formed. female die The cavity 39 includes the lip 5, the upper side wall 27, the second lip 13 and the lower side wall 28. Shape the upper side to form. Distance 29 is a fixed distance, and distance 31 is a variable distance. , manufacturing a base 1 with the required depth to accommodate products 3 of different height dimensions. I can do it. The distance 31 is for raising and lowering the bottom 41 of the female die cavity 39. It can be adjusted by As shown in FIG. It can be done more easily. For use, heat the web l to thermoforming temperature. , and clamped above the female die cavity 39 by a clamp 45. Konoto A vacuum is generated below the web 1 in the die cavity 39, and the female die cavity It can be vacuum formed into the shape of 39.

FIG. 7 shows the preformed base 1 formed at the thermoforming station shown in FIG. transfer to wrap station.

The skin wrap station has a lower portion 47 defining a cavity 49. Then, the base 1 is accommodated in this cavity 49. The cavity 49 has at least The upper part of the bottom of the lip 13 has a shape similar to the upper part of the base. this thing In conjunction with the lower portion 47 is provided with a rubber seal and pressure anvil surface 51. . The skin wrap station is covered by a movable upper chamber section 52, which 52 can be moved up and down relative to the lower portion 47 for sealing. At this time I like it The air pressure inside the wrap station is reduced to below atmospheric pressure, and the platen 33 is lowered. This causes the LLDPEE skin material 7 to touch the top of the product 3 in the pack. to the skin 7 as described with respect to FIGS. 5 and 3. The heating heat bank 53 having a downwardly protruding skirt 55 is lowered. Scar The lowermost end of the lip 55 is inclined at the same angle as the lip 130 angle. In this way, When lowering the base 1 of the skin 7, the skirt 55 lowers the base 1 of the skin 7. This results in a bond at the bottom of the second lip 13. Following the joining by the skirt 55, the other lower the heat bank 57 of the Bonding of the bonding material 7 can be carried out.

In the embodiments described above, the platen 33 and the pressure carried by it are The material 35 is cooled and pressed, for example, by water passing through the hollow interior of the platen 33. The attachment means that the member 35 and this pressing means that the bead 37 of the member bases the skin material 7 during its descent. Do not connect to base 1.

The skin-wrapped product in base 1 is sent to another station (not shown), e.g. For example, attach a lid 9 made of PVC/pH, and apply a suitable gas to the skin 7 with N9. Fill in the spaces between.

How to provide N9 and appropriate gases is described in our PCT patent application no. It is described in PCT/At184100131.

Therefore, this is recognized as common knowledge. Details of this method are provided herein. Include.

FIG. 8 shows a partially lined tray similar to FIG. 1 but with a corrugated bottom 61. 59 shows a pack provided with a corrugated bottom 61 whose corrugations are based on meat or other products 3 1 a small distance upward from the bottom. A large number of openings 63 are provided in the troughs of the waveform. A portion of this opening is shown in FIG. The lining tray 59 is, for example, Pv The opening 63, which is preferably made of a transparent plastic material such as C. It can be easily inserted into the base 1, and the liquid oozing from the meat can be collected in the tray 59. These openings can flow downwards and when the pack is inverted, these openings have a corrugated shape. Since it is located in a mountain rather than a valley, no liquid can pass through the opening 63. I can't stand it anymore. According to this opening 63, the gas packed in the bank can be circulated. I can do it. This will be explained in detail later. The height of the lining tray 59 is the second level. 13.

The pack has a joint 19 along the peripheral lip 5 and a joint 19 at the second lip 13. There are four joints along each side of the pack. along each side as shown in Figure 8. The joints 17 are not continuous with each other, creating unjoined parts 65 at each corner of the pack.

Gas flows from below the skin wrapping 7 to the space 11 and vice versa through the uncoupled portion 65. can pass. Facilitates the passage of gas from the space 11 through the uncoupled portion 65. In order to An opening 67 is provided. The opening 67 is pressed by a fillet protruding from the outer surface of the member 35. It can be formed by a finger-shaped roller 8, and the pressing is performed when the member 35 descends. pierce the skin material. The rod 68 is connected to the heated scar of the heat bank 53. When the tip 55 is lowered, the pusher can swing toward the outer surface of the member 35. . This means that when the skirt 55 engages the rod 68 during movement of the skirt 55, 2, joining the skin 7 to the lower lip 13.

g19 can be a PVC/PE material approximately 100 microns thick.

FIG. 9 shows a longitudinal sectional view of a skin wrapping station 69 of a different embodiment. vinegar. As shown in FIG. 9, the product 3 is placed on the preformed base 1, and The base is preferably formed as a web of plastic material that is integral with the other bases. Common. In other words, a strip of plastic material with a preformed base 1 be. The base 1 is formed by thermoforming as in the above embodiment. Figure 9 shows the above Same as described in PCT Patent Application No. PCT/^U34100131 The gas injection plate means 71 of FIG. The contents of this patent specification are as described above. The skin wrapping station 69, as incorporated herein, is located in the upper chamber portion 73. and a lower chamber portion 75. Each of the upper chamber portion 73 and the lower chamber portion 75 is When the upper chamber portion 73 and the lower chamber portion 75 are combined, the sealing means 77 is provided. A step engages opposite surfaces of the plate means 71 and includes an upper chamber portion 73 and a lower chamber portion 75. Forms a gas seal inside.

In this connection, gas injection plate means 71 (hereinafter referred to as "plate means 71") ) has a center-to-center lower portion 9 corresponding to the shape of the base 10 periphery. This is mentioned above This is clearly stated in PCT Patent Application No. PCT/AU84100131. Ru. The skin wrapping material 7 passes over the upper surface of the plate means 71 on the left side in FIG. ), reaching the lower surface of the plate means perpendicularly to the open lower 9 (see the right side of FIG. 9); The plate means 71 has gas passage means 81 communicating with the open lower lower part 9. like this , the upper chamber portion 73 and the lower chamber portion 75 close around the center-to-center lower portion 9; After reducing the air pressure to below atmospheric pressure, for example, 0□, N2, or CO□. Which gas or a mixture thereof is ejected from the gas passage means 81. skinra When the skin 7 is connected to the base 1, the gas pressure inside the bag is lower than atmospheric pressure. low.

As is clear from FIG. 9, the meat or product 3 is higher than the lower end surface of the second lip 13. It is in a bad position.

In use, place the base 1 on the skin wrapping station 69 at the required degree. When the lower chamber portion 75 is closed to the lower surface of the plate means 71, the upper chamber portion 75 is closed to the lower surface of the plate means 71. 73 can be closed on the top surface of the plate means 71. Reduce air pressure and gas At the same time, a part of the platen 83 is lowered.

This six platen 83 has a two-part structure consisting of an upper heating part 85 and a lower cooling part 87. platen, and these two parts can move independently of each other.

Necessary connections for heating heating portion 85 and cooling cooling portion 87 of platen 83 The following parts are not shown in order to make the explanation of other parts easier to understand.The platen 83 is shown in the upper part. It can move up and down within the side chamber portion 73. The cooling part 87 is pressed by member 3. Carrying 5.

Details of the platen 83 are clearly shown in FIG. As is clear from the drawing, the platen 83 is a two-part platen consisting of an upper heating part 85 and a lower cooling part 87. be. The pressing member 35 has a single peripheral scarf around the lower edge of the lower cooling portion 87. The surface 105 is pressed at the same angle as the inclination angle of the second lip 13. tilt it. A series of apertures 107 are formed in the peripheral skirt 87 and the top surface of the skirt is The push from 109 to surface 105 passes through this opening. Web 110 is opening 1 07 remaining to hold the peripheral skirt against the lower cooling portion 87. This configuration As a result, the pressing surface 105 is cooled. The upper heating section 85 has a series of welding fins. The fingers 113 are provided protrudingly, and these fingers are aligned with the opening 107. When using the The finger 113 is heated from the upper heating section 85, and when the upper section 85 is lowered, this occurs. The fingers pass through opening 107 to weld the skin material.

The lower end 115 of the finger is inclined by the same angle as the angle of inclination of the lower lip 113. Ru. In this way, the lower end of the finger engages the web 7 through the opening 107. Apply pressure to the anvil surface 51 and press the web 7 against the lower lip 13 by the length of the finger 35. Weld across the length and width. This creates a joint 17 similar to that shown in FIG. However, these bonded portions are separated from each other by unbonded portions 117 (12th (see figure).

When the lower cooling section 87 is lowered, the pressing first occurs as the member 35 engages the skin material. , this skin material is pressed against the lower lip 13 and stretched. For pressing, use member 35 If the product 3 protrudes upward into the lower lip 13 due to the slope of the inner surface of the Push the product 3 inward through the lower lip 13, thus compressing the product 3 slightly. Skin 7 gets nervous when he is attacked. Next, when the upper heating portion 85 is lowered, the fin The gas 113 passes through the opening 107 and welds the skin 7 to the lower lip 13, with no pressing Even if member 35 and fingers 113 are removed, skin 7 remains taut.

Atmospheric air is exhausted from a closed chamber defined by an upper chamber portion 73 and a lower chamber portion 75. However, because the gas was replaced with a gas with a pressure slightly lower than atmospheric pressure, skin 7 was replaced with a base gas. 1 and skin back product 3.

In FIG. The details of the finger 113 are shown.

passing through the passageway 81 to facilitate the spreading of the skin 7 against the product 3; Gas is used to expand the skin 7 relative to the base 1, and the skin 7 is attached to the lower cooling part. 87 or the corresponding cavity of the embodiments described above. be able to do so. For this purpose, the underside of the cooling part 87 is designed to cover the skin 7 with the product 3. The height of the level of the underside of plate 71 until it is necessary to engage the 0 surface. Position them so that they are aligned. The web 7 is heated to an appropriate molding temperature and the skin layer is Assist with skin wrapping prior to sending to the wrapping station. cabi Tee 116 can be shaped to meet this purpose. Expansion pressure is atmospheric pressure for example 0.1 bar.

The presence of atmospheric pressure above the skin 7 and within the cavity 116 causes the skin 7 to react. Turn around. Next, the lower cooling part 35 is lowered and the skin is welded to the lower lip 13. . The tension and expansion forces applied to the skin 7 are similar to those described above, but inverted as described above. The process facilitates the skin 7 to assume the required skin wrap condition.

An opening 67 is inserted into the skin 7 between the lower lip 13 and the lip 15 as required. can be achieved. By the fingers 68 of the lower cooling part 87 (see FIG. 10) , is stretched between the lower lip 13 and the upper lip 15, and between these positions the base 1 The skin 70 is inserted into a portion of the skin 70 that cannot directly contact the side wall of the skin. Next base 1 The lid seal described in the above-mentioned patent application No. PCT/AL184100131 station, M9 is installed, and if necessary, the lower part of the lid 9 and the skin 7 The space 11 above is filled with gas.

This pack is then sent to the guillotine station where all bases 1 are set up. Separate the pack from the web material it contains.

In the embodiment of FIGS. 9-12, cooling platen 87 and heating platen 85 are Showing the skin wrap station set up.

In this embodiment plate means 71 are provided to supply a suitable gas to the skin wrap material 7. to allow filling below. In this regard, Figure 9 shows the skin wrap stay. Only the central one of the three packs in the section is shown. Figures 13 and 14 show , which shows three packs being formed simultaneously at the skin wrap station. cooling Although means for moving the platen 87 and the heating platen 85 are not shown, an air bar It is convenient to provide a means of transportation. As is clear from Figure 12, the pack is It has a lower lip 15 and a lower lip 13. Apply skin wrap material 7 to lower lip 13 join to. The required gas is kept above the skin 7 by the lid 9. This results in The gas circulates freely and passes through the opening 67 and the unbonded portion 117 and comes into contact with the surface of the product 30. can be touched. In this way, the entire free volume within the pack is filled with the required gas. distribution and maintain the quality of products such as meat. Product 3 is heated to the required gas by skin 7. This means that there is no risk of undesirable gases being trapped. Taste.

Further, the passageway between adjacent joint parts 17, that is, the unjoined part 117 and the skin 7 are penetrated. Due to the holes formed, the atmospheric pressure above the skin 7 causes a suction to occur before sealing with the lid 9. The skin is attached to the product 3, which allows excess gas below the skin 7 to be removed. . Therefore, the skin 7 can be tightly engaged with the upper surface of the product 3.

Referring now to Figures 13 and 14, the skin wrap station is The upper chamber portion 73 seals as shown in FIG.

In the space below the upper chamber part 73, for example, 0□, N8, Alternatively, fill it with a suitable gas such as CO□ or a mixture thereof, and wrap it with skin wrap. Contain the required gas in the station environment. Heating section 85 and cooling section 8 7 shows the heating bar 163 as an integral block 143 on a skin wrap station. provided on both sides of the section. In use, heat the bar before moving part 85.87. lower the skin wrap material 7 (not shown in Figures 13 and 14) onto the base 1. Welded to the side edges of the material forming the Another heating bar 165 is also provided in the upper cavity. 73 and the lower cavity, the skin wrap material 7 is applied prior to opening the ear 5. After properly joining the bar 165 to the lip 13, the bar 165 is lowered to form the base 1. thermally bond across the web. Bars 163 and 165 form the base 1 Bond the skin wrap material 7 to the web of material and wrap the skin wrap material to the base 1. or keep it stretched out almost uniformly. Above the lower cavity 75 When closing the cavity 73, the skin wrap material 7 is placed against the skin wrap 71. Retained by closing. The downstream side of the skin wrap material is connected to the base 1 bonding action described above. It is held in place by the bond created by the industrial heating bar 165.

According to the embodiment shown in FIGS. 9 to 14, the lid 9 is provided on the pack, and the required amount is placed below the lid 9. type of gas can be held in the hole formed by the finger 68. and below the skin wrap material 7 formed by the bonding surface 115 of the finger 113. It can be seen that the liquid can be circulated through the non-bonded portions 117 between the welded bonded portions 17. This way In this way, the product 3 is firmly held in the pack, and the packed products such as red meat are The required gaskets can be selected to maintain the quality and/or color retention properties of the can be exposed to

The plastic material used for the pack should be the same as in the example above. Can be done.

If desired, bars 163/165 run around the perimeter of the skin wrap station. It is also possible to form welds continuously so that there are no gaps between the welds on the bar. Ru.

FIG. 15 shows an embodiment of a skin wrap station having two stations. shows. This station is the first station 171 and the second station 17. 3. The skin lamp station is of the type described above, in particular the PCT feature described above. of a type similar to that described in patent application no. PCT/AU84100131. A gas injection plate 71 may be provided. Base 1 becomes a skin wrap station When sent, it is first sent to the first station. Plate the upper chamber part 73. Closed to the step 71 and the lower chamber part 75 also closed to the plate means 71. Next, bleed air . Fill the required gas at a pressure lower than atmospheric pressure, for example, 10% of atmospheric pressure. . The first station 171 is provided with a heating platen 175, for example, at a temperature of 90°C. heating the web 7 of skin material to the desired skin wrap temperature. It can be so. Lower the platen 175 towards the skin wrap material 7 and Perform the necessary heating. The required gas is supplied from the opening 81 of the plate means 71 at atmospheric pressure of 1 0%, for example at a pressure of 0.1 bar. At this time, air flows into the upper chamber. Or, the same gas but at a higher pressure is provided below the web 7. the web 7 into the base 1 and the product 3 in the base. be able to upload. Already from platen 175 when introducing gas The heated web 7 joins into the cavity 178 of another heated butylene 177 or move upward without sticking. At this time, lower the lower chamber and base 1 to the second stage generator 173. is introduced into the upper chamber 73, the moved part of the web 7 is reversed, and the product 3 is placed on the base 1. Skin wrap. Lower the other heating platen 177 and apply the skin wrap material 7. It is coupled to the lower lip 13 of the base 1. Processed at the second station at base 1 In the meantime, other base 1 processing can be performed at the first station. heating platen The temperature at 177 is preferably 115°C, which is the temperature at which the skin wrap material 7 is It is sufficient to weld the lip 13. In this way, the implementation shown in FIG. For example, different temperatures may be provided for (a) skin wrap and (b) weld bonding. be able to. The heated platen 177 has a completely continuous weld around the lip 13. or, as in the embodiments described above, to produce a series of welds spaced apart from each other. can be configured.

Figure 16 shows both heating to the skin wrap temperature and heating to the bonding temperature. In this example, which shows a completely different type of platen used to perform A platen base 181 is provided. On this base 181, continuous or intermittent A first platen area 183 and a second platen area 185 are provided. 1st platen The region 183 is made into a continuous shape, and when heated to the required temperature, a continuous joint is formed by thermal welding. Heat to produce. If necessary, the first platen region 183 is made into an intermittent shape, A series of joints separated from each other are formed to provide gas passage means in the same manner as in the embodiments described above. You can also do this. Second platen area 185 is heated to skin wrap temperature. As a result, the plastic web 7 is heated to the required skin wrap temperature. Ru.

The first platen area 183 is independent of the heating means that heats the second platen area 185. Heated by other heating means that operate automatically. Preferably the first platen area 183 is heated by an electric coil 187, and the second platen area is heated by an electric coil 189. Heat it up. Coil 187 is connected to an input energy source, such as an AC energy source; The temperature is controlled by thermostat means 191. The electric coil 189 is also It is connected to a power source and controlled by thermostatic means it3. In this way 18 Required temperature in the selected area of skin lamp material 7 by the platen shown in Figure 18 can be heated to temperatures suitable for bonding by heat welding or skin wrapping. Ru.

Heating in the first platen area 183 and second platen area 185 is not necessarily electrical. It does not have to be a physical heating means, but any other suitable heating means that can control the temperature automatically. Thermal means can also be used.

The platen means shown in Figure 16 can also be used in other environments, such as blow molding. Blow molding involves heating selected areas of plastic material to different temperatures. , facilitates blow molding of plasti-7. The platen shown in FIG. It can be used in place of the platen in the embodiment, and in this case it can be used for thermal welding to the lower lip 13. and skin wrapping of the web 7 to the product 3.

Figure 17 shows another type of printer consisting of two parts that move independently and relative to each other. Indicates Latin. Each platen section controls the area of the plastic material to be heated according to the process. Heat to appropriate temperature. The platen has a central portion 195 and an outer peripheral portion 197. and has. In use, both the center portion 195 and the peripheral portion 197 are the web of skin wrap material 7 so as to interlock with or near the upper surface of the web of skin wrap material 7. Then the peripheral portion 197 is lowered and pressure is applied to form a bond around the upper lip 5. Add force. Bleed air from the skin wrap station to a large area below web 7. Introduce the required gas at a pressure lower than atmospheric pressure. of web 7 than below web 7. Since the air pressure is lower in the upper part, the web 7 moves upward towards the central part 195. It moves and is heated by this central part. This allows the cavity in the central portion 195 to Matches the shape of 199. Next, the center portion 195 is lowered and placed on the bottom surface 201. The skin wrap material 7 is bonded to the lower lip 13 by heat welding. This is above This results in a complete gas-tight seal around the lower lip 15, but not on the lower lip 13. This is because it is not necessary to create a perfect gas-tight seal, such as Ru. The peripheral portion 197 is heated to a desired temperature and the central portion 195 is heated to a different desired temperature. The temperature of the web material to be bonded can be controlled because the web material is heated at a constant temperature. periphery Temperature control in combination with mutually independent pressure control by section 197 and central section 195 Temperature control can also be used in the embodiments described above, and can also be used to It can also be used when it is necessary to selectively heat to a certain temperature.

FIG. 18 shows a modification of the embodiment shown in FIGS. 9 to 11. In this example, 3 movable platens are provided. Lower platen 87 is a cooling platen. intermediate plastic Ten 85 is a heating platen, and upper platen 88 is a cooling platen.

In use, first lower the platen 87 and place the skin 7 on the lower edge of the lip 13. Hold. Next, the upper platen 88 is lowered to remove the skin 7 from the upper edge of the lip 13. hold it. The temperature of both the lower platen 87 and the upper platen 88 is controlled. maintained at approximately the same temperature, which thermally welds or bonds the skin 7 to the web 1. The temperature shall be lower than the temperature.

The lower platen 87 and upper platen 88 are lowered to wrap the web 7 onto the lip 13. When holding the skin 7 on the anvil 51, the intermediate heating platen 85 is lowered and the skin 7 is held on the anvil 51. It can be heat welded or bonded to the web 1. After this, platen 87, 88 and and 85.

As described in the above-mentioned PCT patent application no. PCT/AU86100339 The skin wrapping technique is a stretch technique according to the present invention described herein. A thicker skin web 7 is required. Stretch for skin 7 of the invention The technology allows the skin to be thinner than traditional packs, and Retention characteristics can be improved. Furthermore, since the skin 7 can be made thinner, the skin 7 can be made thinner. The gas permeability in the skin material 7 is improved and therefore from the top to the bottom of the skin 7 as well as On the contrary, it is not necessary to provide a non-coupled portion 65 or an opening 67 to promote gas flow. It becomes unnecessary.

Furthermore, if required, the skin 7 can be made non-gas permeable depending on the product. Wear.

In the embodiments described above, the skin 7 is a co-extruded laminate of PE/EVA or can be a similar laminate.

EVA can be about 5 microns thick and PE can be about 20 microns thick. Ru. EVA laminate is PvC or PVC/PE coextrusion laminate or or with a base made of PVC/PVA coextrusion laminate, with EVA laminate contacts the base or a laminate of this base at a similar melting temperature. E VA has a melting temperature of approximately 80"C, lower than the melting temperature of PE (approximately 115"C). one layer of skin 7 by heating to the low melting temperature of the plastic. It is possible to bond the skin to base 1 while leaving the laminate unmolten. This allows the tension and stretch forces to be maintained and the stress The material will not be damaged.

In another variant of the invention, the skin 7 is attached to the base 1 along the periphery of the base 1. It is also possible to connect it to the bottom part 15 and not provide the second lip 13. child In an embodiment, the base 1 may have the shape shown in FIGS. 1 and 2. . In this case, when the skin 7 is connected to the base 1, tension is generated in the skin 7. It is to do so.

In yet another modification, the top surface of the product 3 is above the upper lip 15 of the base 1. so that the tension in the skin 7 as a result of the bonding of the skin 7 to the lip 15 It is also possible to maintain the . In this embodiment, the second lip 13 is Not provided. Therefore, this pack somewhat resembles the shape shown in Figure 1, but the lid 9 has a convex shape. The shape of the product 3 and the required gas are stored in the convex portion of the lid 9.

The foregoing merely describes the preferred embodiments of the invention and does not fall within the scope of the claims. Of course, various changes can be made.

(Correction) Copy and translation of amendment) Submission (Article 184-8 of the Patent Law) 1989 February 28th Director General of the Patent Office Yoshi 1) Takeshi Moon 1. Display of patent application PCT/AU87100297 2. Name of the invention Improved pancaging 3. Patent applicant Name: Garwood Limited Representative: Garwood Anthony James Murray Country: Australia Country 4. Deputy manager August 15, 1988 6. List of attached documents (Copy and translation of the 11th written amendment) 1. Scope of claims 1. In packs made of plastic material for meat or other products, plus a base of tick material and said base with meat or other products to be placed on this base said base along the periphery of the base as well as overlapping the meat or other product on top. between the skin of the bonded plastic material and the skin that abuts this skin. a plastic material bonded to the base along the periphery of said base to create a space in the base; and a gas filling the said space to enhance the quality maintenance of the packed product. retaining said meat or other product compressed by said skin beneath said skin; Then, the skins are bonded so that tension is applied to the skin, and the skin is approximately Almost continuous tension is applied to hold the skin and meat or other product in a tight skin wrap. A pack characterized by keeping you in a ping relationship.

2. The base has an upper peripheral lip, and the upper lip and the bottom of the base. and a lower lip between the skin and the lower lip. A pack according to claim 1, which is combined.

3. The bonding is not continuous along the lower lip and the gas in the pack is The gas above the skin is circulated by 3. A bank according to claim 2, further comprising passage means for contacting the surface of the article.

4. coupling said skin also to said peripheral lip, said lower lip and front of said skin; The gas in the pack is passed through the area between the circumferential lip and the skin. an opening that allows gas to circulate under the skin and contact the surface of the meat or other product 4. A pack according to claim 3, further comprising means.

5. In the pack manufacturing method, Provided with a base of plastic material, Place meat or other products on said base and place plastic on said meat or other products. Place the skin of the material, the meat or other product by placing the skin under tension over the meat or other product; compresses the other product and maintains the tension relationship with the skin along the periphery of the base. holding and bonding to said base; A lid of plastic material is coupled to the base above the skin and connected to the lid. forming a space between the skin and the skin; The space is filled with a gas that enhances quality maintenance of the packed product. , The skin is bonded and compressed by the skin against the meat or other product. The resulting outward directed force maintains the state of tension almost continuously. A bank manufacturing method characterized by the following.

6. The pack has an upper peripheral lip, the upper lip and the bottom of the base. and a lower lip between the skin and the lower lip. The bag manufacturing method according to claim 5, wherein the bag manufacturing method is combined.

7. The bonding is not continuous along the lower lip and the gas in the pack is The gas above the skin is circulated by The method for producing a pack according to claim 6, wherein the pack is configured to form a passage means that is brought into contact with the surface of the product. .

8. coupling said skin also to said peripheral lip, said lower lip and front surface of said skin; The gas in the pack is passed through the part between the skin and the peripheral lip. An opening that circulates the gas above and contacts the meat or other product surface below the skin. 8. The method of manufacturing a pack according to claim 7, further comprising a mouth means.

9. Base made of plastic material and this for packaging meat or other products. Meat or other products to be placed on the base and overlapping meat or other products on said base. of plastic material mating together and bonded to said base along the periphery of said base. the base so as to abut the skin and create a space between the skin and the skin; A lid of plastic material bonded to the base along the periphery of the Made of plastic material with gas filled in the space to enhance quality maintenance. In the pack manufacturing equipment of a lower chamber capable of accommodating said base; and a meat or closing the lower chamber with another product and the skin placed on the base; an upper chamber, and an air bleed means for bleeding air pressure between the upper chamber and the lower chamber; interlocking the skin with the meat or other product between the skin and the base; pressing the skin to apply a compressive force to the meat or other product of a member that couples the skin to the base and applies substantially continuous tension to the skin; force maintains the skin and the meat and other products in a tight skin-wrapping relationship; a coupling means for attaching a lid to the base and as required between the skin and the lid; A pack manufacturing device characterized by comprising: a lid attachment means for filling the gas.

10. The pack has an upper peripheral lip, the upper lip and the bottom of the base. and a lower lip between the two, and the pressing is performed by a member to the skin against the lower lip and the coupling means press the skin against the lower lip. 10. The pack according to claim 9, wherein the pack is configured to be coupled to a side lip.

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Claims (12)

[Claims] 1. In packs made of plastic material for meat or other products, plastic a base of meat or other products to be placed on this base, and on said base overlapping the meat or other product and tying to said base along the periphery of the base. between a skin of plastic material that is mated to the skin and abutting this skin. a plastic material bonded to the base along the periphery of said base to create a space; lid and a gas filled in the space to strengthen the quality maintenance of the packed product. and holding the meat or other product compressed by the skin below the skin. , the skin is bonded so that tension is applied to the skin, and the skin is approximately Continuous tension applies skin and meat or other products to tightly wrap the skin A pack characterized by maintaining the relationship between 2. The base has an upper peripheral lip and a bottom portion of the base. a lower lip in between, and the skin is connected to the lower lip. 2. The pack according to claim 1. 3. The continuously applied tension is compressed by the skin and the base. Pack according to claim 1 or 2, characterized in that it is produced by meat or other products. 4. The bonding is not continuous along the lower lip, and the gas within the pack is The gas above the skin is circulated by The pack according to claim 2 or 3, wherein the pack forms a passage means for contacting the surface of the product. . 5. the skin is also coupled to the peripheral lip, and the lower lip and front of the skin The gas in the pack is passed through the area between the circumferential lip and the skin. an opening that allows gas to circulate under the skin and contact the surface of the meat or other product 5. A pack according to claim 4, further comprising means. 6. In the pack manufacturing method, Provide a base of plastic material, Place meat or other products on said base and place plastic on said meat or other products. Place the skin of the material, the meat or other product by placing the skin under tension over the meat or other product; compresses the other product and maintains the tension relationship with the skin along the periphery of the base. holding and bonding to said base; A lid of plastic material is coupled to the base above the skin and connected to the lid. forming a space between the skin and the skin; The space is filled with a gas that enhances quality maintenance of the packed product. , The skin is bonded and compressed by the skin against the meat or other product. The resulting outward directed force maintains the state of tension almost continuously. A pack manufacturing method characterized by the following. 7. The pack has an upper peripheral lip and a bottom of the base. a lower lip in between, and the skin is connected to the lower lip. 7. The pack manufacturing method according to claim 6. 8. The continuously applied tension is compressed by the skin and the base. Claim 6 or 7, configured as generated by meat or other products. Pack manufacturing method. 9. The bonding is not continuous along the lower lip, and the gas within the pack is The gas above the skin is circulated by The pack according to claim 7 or 8, wherein the pack is configured to form a passage means for contacting the surface of the product. Production method. 10. the skin is also coupled to the peripheral lip; and the skin is coupled to the lower lip of the skin. The gas in the pack is passed through the skin to the part between the peripheral lip and the peripheral lip. Circulate the gas above and contact the meat or other product surface below the skin 10. The pack manufacturing method according to claim 9, further comprising an opening means. 11. For packaging meat or other products, a base made of plastic material and this Meat or other products to be placed on the base and overlapping meat or other products on said base. of plastic material mating together and bonded to said base along the periphery of said base. the base so as to abut the skin and create a space between the skin and the skin; A lid of plastic material bonded to the base along the periphery of the Made of plastic material with gas filled in the space to maintain quality In the pack manufacturing equipment of a lower chamber capable of accommodating said base; and a meat or closing the lower chamber with another product and the skin placed on the base; an upper chamber, and an air bleed means for bleeding air pressure between the upper chamber and the lower chamber; interlocking the skin with the meat or other product between the skin and the base; pressing the skin to apply a compressive force to the meat or other product of a member that couples the skin to the base and applies substantially continuous tension to the skin; force maintains the skin and the meat and other products in a tight skin-wrapping relationship; a coupling means for attaching a lid to the base and as required between the skin and the lid; A pack manufacturing device characterized by comprising: a lid attachment means for filling the gas. 12. The pack has an upper peripheral lip, the upper lip and a bottom of the base. and a lower lip between the pressing member and the sliding member. the skin against the lower lip and the coupling means press the skin against the lower lip. 12. The pack manufacturing device according to claim 11, wherein the pack manufacturing device is coupled to a side lip.