A production device for carton ventable high-stiffness heat-shrinkable film

Abstract

The utility model provides a production device for carton exhaustible high stiffness heat shrinkable film, it has solved heat shrinkable film punching exhaust and so on, it includes contact guide roller, the surface of contact guide roller has a plurality of along the axial extension movable slot, movable slot is relatively contact guide roller central axis and presents central symmetry arrangement, is installed with punching assembly respectively in movable slot, and the axial adjusting assembly is arranged between movable slot and punching assembly. The utility model has good punching effect, stable structure and the like advantages.

Description

Technical Field

[0001] This utility model belongs to the field of film production technology, specifically relating to a production device for a high-stiffness heat shrinkable film with air venting for cardboard boxes. Background Technology

[0002] In cardboard packaging, heat shrink film is often used to reinforce the box structure and prevent damage during transportation. By tightly wrapping the PE shrink film around the outside of the box using cuff-type heat shrink packaging, a protective layer is formed, enhancing the box's compression resistance and impact resistance. It also prevents the box from getting damp or contaminated, ensuring the safety and quality of the products inside. However, existing heat shrink films on the market often lack stiffness after forming. When the film comes out of the drying tunnel, the air between the film and the box cannot escape instantly, causing bulges that affect subsequent stacking and transportation.

[0003] To address the shortcomings of existing technologies, people have conducted long-term explorations and proposed various solutions. For example, Chinese patent literature discloses a guide roller assembly for POF heat shrink film [202020772850.4], which includes a base, a heat shrink film production machine fixedly connected to the upper surface of the base, a support leg fixedly connected to the upper surface of the base, a heat shrink film conveyor platform fixedly connected to the upper surface of the support leg, a conveying groove formed on the upper surface of the heat shrink film conveyor platform, a conveying guide rail provided on the inner wall of the conveying groove, a conveying guide roller provided on the inner wall of the conveying guide rail, anti-slip protrusions fixedly connected to the surface of the conveying guide roller, and a synchronous rotation belt provided on the surface of the conveying guide roller shaft.

[0004] The above solution has solved the problem of heat shrink film production and transmission to a certain extent, but it still has many shortcomings, such as poor exhaust effect. Summary of the Invention

[0005] The purpose of this invention is to address the above-mentioned problems by providing a reasonably designed production device for high-stiffness heat shrinkable film for cardboard boxes with good venting effect.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a production device for a heat shrinkable film with high stiffness and air-venting capability for cardboard boxes, comprising a contact guide roller, wherein a plurality of axially extending movable grooves are opened on the surface of the contact guide roller, the movable grooves are centrally symmetrically arranged relative to the central axis of the contact guide roller, a punching component is installed in each of the movable grooves, and an axial adjustment component is provided between the movable grooves and the punching component.

[0007] In the above-mentioned production apparatus for a high-stiffness heat shrinkable film for cardboard boxes with air venting, the contact guide roller includes a central rotating shaft and a contact sleeve installed outside the central rotating shaft. There are several independently arranged movable cavities between the central rotating shaft and the contact sleeve, which correspond one-to-one with the movable grooves.

[0008] In the above-mentioned production apparatus for a high-stiffness heat shrinkable film for cardboard boxes with air venting, the axial adjustment assembly includes an adjustment shaft movably installed in the movable cavity with its central axis parallel to the central axis of the contact guide roller. An adjustment block is slidably installed on the adjustment shaft. The adjustment block has an adjustment groove for the adjustment shaft to pass through and for the adjustment shaft to slide radially. An adjustment motor is installed in the movable cavity, and the output end of the adjustment motor is connected to an adjustment screw that meshes with and drives the adjustment block.

[0009] In the above-mentioned production apparatus for a high-stiffness heat shrinkable film for cardboard boxes with air venting, the punching assembly includes a punching needle that is telescopically mounted on an adjusting block and opposite to a movable groove, an elastic reset component is installed between the adjusting shaft and the adjusting block, and a shrinkage linkage assembly is provided between the punching needle and the adjusting shaft and the contact guide roller.

[0010] In the above-mentioned production device for high stiffness heat shrink film with air venting for cardboard boxes, the shrink linkage assembly includes a linkage roller rotatably mounted at the end of the adjusting shaft, a central rotating shaft rotatably connected in the linkage base, the linkage base having a linkage guide rail with the inner side fitting against the linkage roller, the linkage guide rail having a shrinking part and an extending part connected end to end in a loop, and the junction of the shrinking part and the extending part is smoothly transitioned.

[0011] In the aforementioned production apparatus for a high-stiffness heat-shrinkable film for cardboard boxes, the end of the punching needle is a cone with a bottom diameter of 3mm and a height of 4mm.

[0012] In the aforementioned production apparatus for a high-stiffness heat shrinkable film with venting capability for cardboard boxes, the width of the movable groove is 6-11 mm.

[0013] In the aforementioned production apparatus for a high-stiffness heat-shrinkable film for cardboard boxes, a piezoelectric sensor is installed on the contact guide roller.

[0014] In the aforementioned production apparatus for a high-stiffness heat-shrinkable film for cardboard boxes, the contact guide rollers are made of stainless steel.

[0015] In the aforementioned production apparatus for a high-stiffness heat-shrinkable film for cardboard boxes with venting capability, an encoder is installed at the end of the contact guide roller.

[0016] Compared with existing technologies, the advantages of this utility model are as follows: the perforation component and the axial adjustment component work together to achieve flexible adjustment of the hole position of the heat shrink film, thereby ensuring its air permeability during packaging; the perforation component is controlled by the shrink linkage component to open the heat shrink film, which does not affect the continuity of heat shrink film transmission and ensures its stable winding and storage; the piezoelectric sensor detects the surface pressure of the contact guide roller in real time to prevent the heat shrink film from tearing due to excessive tension. Attached Figure Description

[0017] Figure 1This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 This is a structural schematic diagram from another perspective of the present invention;

[0019] Figure 3 This is a structural cross-sectional view of the present invention;

[0020] Figure 4 This is a partial schematic diagram of the present invention;

[0021] In the figure, there are contact guide roller 1, central rotating shaft 11, contact sleeve 12, movable cavity 13, movable groove 2, punching assembly 3, punching needle 31, elastic reset component 32, axial adjustment assembly 4, adjustment shaft 41, adjustment block 42, adjustment groove 43, adjustment motor 44, adjustment screw 45, retraction linkage assembly 5, linkage roller 51, linkage base 52, linkage guide rail 53, retraction part 54, and extension part 55. Detailed Implementation

[0022] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0023] like Figure 1-4 As shown, a production apparatus for high-stiffness heat shrinkable film with venting capability for cardboard boxes includes a contact guide roller 1. The contact guide roller 1 is the core load-bearing component for film conveying, positioning, and perforation operations. Its surface must possess good wear resistance and moderate friction to ensure stable film conveying and prevent slippage or scratches. The surface of the contact guide roller 1 has several axially extending movable grooves 2, which are centrally symmetrically arranged relative to the central axis of the contact guide roller 1. Perforation components 3 are installed within each movable groove 2. An axial adjustment component 4 is provided between the movable grooves 2 and the perforation components 3, allowing the perforation position to be flexibly and precisely adjusted laterally according to the film width or specific packaging box venting requirements, without needing to replace the entire contact guide roller 1 or the perforation components 3, significantly improving the adaptability and production efficiency of the equipment.

[0024] Specifically, the contact guide roller 1 includes a central rotating shaft 11 and a contact sleeve 12 mounted outside the central rotating shaft 11. Several independently arranged movable cavities 13, each corresponding to a movable groove 2, are provided between the central rotating shaft 11 and the contact sleeve 12. The movable cavities 13 provide the necessary installation and movement space for the internal axial adjustment components 4, while maintaining the structural strength and rigidity of the contact guide roller 1 to withstand film tension and the reaction force of the perforation components 3. The independence of the movable cavities 13 ensures that the adjustment of each perforation component 3 does not interfere with each other.

[0025] Specifically, the axial adjustment assembly 4 includes an adjustment shaft 41 movably mounted within the movable cavity 13, with its central axis parallel to the central axis of the contact guide roller 1. An adjustment block 42 is slidably mounted on the adjustment shaft 41. The adjustment block 42 has an adjustment groove 43 for the adjustment shaft 41 to pass through and for radial sliding. This adjustment groove 43 is typically designed as an elongated hole structure, allowing the adjustment block 42 to slide axially along the adjustment shaft 41 while providing a certain amount of floating space in the radial direction to accommodate minor deformations or assembly tolerances that may occur during the operation of the guide roller, ensuring smooth movement. An adjustment motor 44 is installed within the movable cavity 13, and the output end of the adjustment motor 44 is connected to an adjustment screw 45 that meshes with the adjustment block 42. The adjustment motor 44 receives commands from the control system and drives the adjustment screw 45 to rotate. The adjustment screw 45 meshes with a nut fixed on the adjustment block 42, thereby precisely converting the rotational motion of the screw into linear displacement of the adjustment block 42 along the adjustment shaft 41.

[0026] Furthermore, the punching assembly 3 includes a punching needle 31 that is telescopically mounted on the adjusting block 42 and opposite to the movable groove 2. An elastic reset member 32 is installed between the adjusting shaft 41 and the adjusting block 42. The elastic reset member 32 continuously applies a radially outward force to the punching needle 31, causing the punching needle 31 to pop out in the punching state. A retraction linkage assembly 5 is provided between the punching needle 31 and the adjusting shaft 41 and the contact guide roller 1. The extension of the punching needle 31 is driven by the elastic reset member 32, and the retraction linkage assembly 5 retracts the punching needle 31.

[0027] Furthermore, the retraction linkage assembly 5 includes a linkage roller 51 rotatably mounted at the end of the adjusting shaft 41. A central rotating shaft 11 is rotatably connected within a linkage base 52. The linkage base 52 has a linkage guide rail 53 whose inner side is in contact with the linkage roller 51. The linkage base 52 is fixed, while the linkage roller 51 and the linkage guide rail 53 engage in transmission. The linkage guide rail 53 has a retractable portion 54 and an extended portion 55 connected end-to-end, with a smooth transition at the junction of the retractable portion 54 and the extended portion 55. When the linkage roller 51 drives the adjusting shaft 41, the adjusting shaft 41 slides radially relative to the contact guide roller 1. The linkage guide rail 53 is a fixed spatial cam track. When the linkage roller 51 rotates, it is constrained by the profile of the linkage guide rail 53.

[0028] The aforementioned shrinkage linkage component 5 works in conjunction with the punching component 3, converting the continuous rotational motion of the guide roller into precise periodic radial extension and retraction motion of the punching needle 31, with the punching phase determined by the linkage guide rail 53. Each punching needle 31 completes one punching and resetting cycle for every rotation of the contact guide roller 1.

[0029] In addition, the tip of the punching needle 31 is a cone with a bottom diameter of 3mm and a height of 4mm, balancing piercing ability and hole size. The sharp cone tip easily pierces the film, while the bottom diameter controls the size of the resulting micropore, effectively venting air to prevent the carton from bulging without significantly weakening the film strength or causing tearing. The smooth conical surface facilitates the smooth withdrawal of the punching needle 31 from the film hole, reducing adhesion or material carryover.

[0030] Meanwhile, the width of the movable groove 2 is 6-11mm. This width range needs to be larger than the bottom diameter of the perforating needle 31 to provide sufficient clearance for the extension and retraction of the perforating needle 31 and avoid jamming. At the same time, the width does not exceed 11mm to ensure the effective support area on the surface of the contact guide roller 1 and maintain the stability of film conveying.

[0031] As can be seen, a piezoelectric sensor is installed on the contact guide roller 1. It is usually installed inside the contact guide roller 1 or at the key force point of the linkage base 52 to monitor in real time the impact force of the punching needle 31 piercing the film or the vibration signal during the operation of the contact guide roller 1.

[0032] Clearly, the stainless steel material used for the contact guide roller 1 balances strength, hardness, wear resistance, and corrosion resistance, ensuring a long service life and dimensional stability of the contact guide roller 1, and reducing the decrease in precision caused by wear.

[0033] Preferably, an encoder is installed at the end of the contact guide roller 1, which is coaxially mounted with the central rotating shaft 11, and is used to accurately measure the rotation angle and speed of the contact guide roller 1.

[0034] In summary, the principle of this embodiment is as follows: the heat-shrinkable film is conveyed by rotating the contact guide roller 1, and precise perforation is completed simultaneously. When the linkage roller 51 installed at the end of the adjusting shaft 41 rotates with the guide roller to the extension part 55, it forces the adjusting shaft 41 to move radially outward under the elastic force of the elastic reset member 32, pushing the perforating needle 31 to extend from the movable groove 2 to pierce the film and meet the air venting requirements; when the roller runs to the shrinking part 54, under the action of another elastic reset member 32, the adjusting shaft 41 and the perforating needle 31 quickly retract and detach from the film surface. This process precisely converts the continuous rotation of the contact guide roller 1 into the periodic radial extension and retraction perforation action of the perforating needle 31.

[0035] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

[0036] Although this document frequently uses terms such as contact guide roller 1, central rotating shaft 11, contact sleeve 12, movable cavity 13, movable groove 2, punching assembly 3, punching needle 31, elastic reset component 32, axial adjustment assembly 4, adjusting shaft 41, adjusting block 42, adjusting groove 43, adjusting motor 44, adjusting screw 45, retraction linkage assembly 5, linkage roller 51, linkage base 52, linkage guide rail 53, retraction part 54, and extension part 55, the possibility of using other terms is not excluded. The use of these terms is merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any additional limitation would contradict the spirit of this utility model.

Claims

1. A production apparatus for a high-stiffness heat-shrinkable film for cardboard boxes, comprising a contact guide roller (1), characterized in that, The contact guide roller (1) has several axially extending movable grooves (2) on its surface. The movable grooves (2) are arranged in a centrally symmetrical manner with respect to the central axis of the contact guide roller (1). A punching assembly (3) is installed in each of the movable grooves (2). An axial adjustment assembly (4) is provided between the movable grooves (2) and the punching assembly (3).

2. The production apparatus for a high-stiffness heat-shrinkable film for cardboard boxes according to claim 1, characterized in that, The contact guide roller (1) includes a central rotating shaft (11) and a contact sleeve (12) installed outside the central rotating shaft (11). There are several independently arranged movable cavities (13) between the central rotating shaft (11) and the contact sleeve (12) that correspond one-to-one with the movable groove (2).

3. The production apparatus for a high-stiffness heat-shrinkable film for cardboard boxes according to claim 2, characterized in that, The axial adjustment assembly (4) includes an adjustment shaft (41) movably installed in the movable cavity (13) with its central axis parallel to the central axis of the contact guide roller (1). An adjustment block (42) is slidably installed on the adjustment shaft (41). An adjustment groove (43) is opened on the adjustment block (42) for the adjustment shaft (41) to pass through and for the adjustment shaft (41) to slide radially. An adjustment motor (44) is installed in the movable cavity (13). The output end of the adjustment motor (44) is connected to an adjustment screw (45) that meshes with the adjustment block (42).

4. The production apparatus for a high-stiffness heat-shrinkable film for cardboard boxes according to claim 3, characterized in that, The punching assembly (3) includes a punching needle (31) that is telescopically mounted on the adjusting block (42) and opposite to the movable groove (2). An elastic reset member (32) is installed between the adjusting shaft (41) and the adjusting block (42). A shrinkage linkage assembly (5) is provided between the punching needle (31) and the adjusting shaft (41) and the contact guide roller (1).

5. The production apparatus for a high-stiffness heat-shrinkable film for cardboard boxes according to claim 4, characterized in that, The retraction linkage assembly (5) includes a linkage roller (51) rotatably mounted at the end of the adjusting shaft (41), the central rotating shaft (11) is rotatably connected in the linkage base (52), the linkage base (52) has a linkage guide rail (53) with its inner side in contact with the linkage roller (51), the linkage guide rail (53) has a retraction part (54) and an extension part (55) connected end to end, and the retraction part (54) and the extension part (55) are smoothly transitioned at the junction.

6. The production apparatus for a high-stiffness heat-shrinkable film for cardboard boxes according to claim 4, characterized in that, The end of the punching needle (31) is a cone with a bottom diameter of 3mm and a height of 4mm.

7. The production apparatus for a high-stiffness heat-shrinkable film for cardboard boxes according to claim 1, characterized in that, The width of the movable groove (2) is 6-11mm.

8. The production apparatus for a high-stiffness heat-shrinkable film for cardboard boxes according to claim 1, characterized in that, A piezoelectric sensor is installed on the contact guide roller (1).

9. The production apparatus for a high-stiffness heat-shrinkable film for cardboard boxes according to claim 1, characterized in that, The contact guide roller (1) is made of stainless steel.

10. The production apparatus for a high-stiffness heat-shrinkable film for cardboard boxes according to claim 1, characterized in that, An encoder is installed at the end of the contact guide roller (1).

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