WO2019214530A1 - 一体式袋多层组合体的生产方法 - Google Patents
一体式袋多层组合体的生产方法 Download PDFInfo
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- WO2019214530A1 WO2019214530A1 PCT/CN2019/085412 CN2019085412W WO2019214530A1 WO 2019214530 A1 WO2019214530 A1 WO 2019214530A1 CN 2019085412 W CN2019085412 W CN 2019085412W WO 2019214530 A1 WO2019214530 A1 WO 2019214530A1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
- B29C51/10—Forming by pressure difference, e.g. vacuum
Definitions
- the invention relates to the technical field of a bag body production method.
- An integral bag refers to a bag in which the body is a one-piece structure; it is not obtained by crimp bonding of a flat or tubular plastic film.
- the integrated bag assembly refers to a combined bag body which is formed by lining up a multi-layered integrated bag layer.
- the unitary bag forming the unitary bag assembly can be removed from the inner to outer layer.
- the multi-layer integrated bag constituting the integrated bag assembly is incrementally increased from inner to outer diameters, and is incrementally increased so that each adjacent two-layer integrated bag can be relatively neatly fitted.
- a filler is added between each adjacent two-layer integral bag, and the filler can prevent each adjacent two-layer integrated bag from being bonded.
- a convenient multi-layer disposable environmentally-friendly garbage bag disclosed in Chinese Utility Model No. 201720791280.1 adopts a technical scheme of a layered garbage bag, and the garbage bag is used from the innermost layer, and each used up One layer can be taken out, and the remaining garbage bags continue to be used in the trash can. It is not necessary to repeatedly bag and it is very convenient to use.
- the garbage bag of "a convenient multi-layer structure disposable environmental garbage bag” is still a traditional bonded garbage bag, not a one-piece structure, and is still produced by the traditional bag making process.
- the traditional bag making method is formed by crimping a flat or tubular plastic film, and the bag body manufactured is not a unitary structure, the crimping edge is not smooth, and wrinkles and gaps are likely to occur when the multi-layer is knotted; on the other hand, The bag made by the traditional bag making line is fixed in size.
- the traditional bag making method produces
- the bag needs to be assembled in layers to obtain a multi-layer bag body.
- the assembly process is not only complicated but also prone to wrinkles and gaps.
- the accumulation of the pleated layers reduces the regularity of the shape of the inner surface after being placed in the trash can, on the one hand, the volume of use of the trash can is reduced, and on the other hand, the wrinkles are prone to breakage.
- the integrated bag itself has no bonding edge and the whole body is smooth, when the multi-layer is knotted, the layers of the bag body can be closely adhered to each other without wrinkles, so when the integrated bag assembly is used as a garbage bag Compared with traditional multi-layer plastic bags, it has great advantages.
- the integrated bag assembly is not an existing technical product, and it is only present in the technical specifications mentioned in the background art. Moreover, the integrated bag assembly cannot be produced by a conventional bag making process such as blown film, calendering, casting, and crimping. At present, there is no corresponding production method in the prior art to produce an integrated bag assembly.
- the technical problem to be solved by the present invention is to provide a method for producing an integrated bag multi-layer assembly in view of the above-mentioned technical deficiencies.
- the technical scheme adopted by the invention is: using a thermoplastic sheet as a raw material, stacking a plurality of layers of thermoplastic sheets to eliminate air between the layers of the plastic sheets; and then laminating the sheets of the multilayer thermoplastic sheets
- the assembly is subjected to synchronous portable thermoforming, and the planar sheet assembly is formed into an integrated bag multi-layer assembly having a pocket cavity;
- Synchronous portable thermoforming comprises: pressing the sheet assembly and the elastic carrying pad by fluid pressure; heating the sheet assembly to a softened state; and elastically expanding the elastic carrying mat in the molding cavity by fluid pressure; By setting the elastic coefficient of each position of the elastic carrying pad, the elastic ratio of each position after stopping the expansion in the molding cavity is controlled; the sheet assembly is passively followed by the elastic carrying pad deformation, so that each of the sheet assemblies is made The position is one-to-one corresponding to each position of the elastic carrying pad to produce the same thinning rate; the thinning and stretching amount of each position of the sheet assembly is accumulated, and finally the integrated body with the pocket cavity is formed in the forming cavity. Multi-layer combination of bags.
- thermoforming Prior to thermoforming, a filler that prevents interlayer adhesion of the thermoplastic sheet is added between adjacent thermoplastic sheets.
- the present invention can: 1. Produce an integrated bag multi-layer assembly. 2. The process of producing the bag is accompanied by the layering of the multi-layer bag. 3. The production of integrated bag multi-layer assembly has high efficiency and good quality.
- Figure 1 is a schematic view of the synchronous portable thermoforming of the present invention
- Figure 2 is a schematic view showing the structure of a sheet winding device
- the synchronizing assembly 6 refers to a combination of the elastic carrying mat 3 and the sheet assembly 1 which are press-fitted.
- the invention relates to a method for producing a one-piece bag multi-layer assembly, which uses a thermoplastic sheet as a raw material to stack a plurality of layers of thermoplastic sheets to eliminate air between the layers of the plastic sheets; and then stacks the layers of the thermoplastic sheets.
- the formed sheet assembly 1 is subjected to synchronous portable thermoforming, and the planar sheet assembly 1 is formed into an integrated bag multi-layer assembly 7 having a pocket cavity;
- Synchronous portable thermoforming comprises: pressing and bonding the sheet assembly 1 and the elastic carrying mat 3 by fluid pressure; heating the sheet assembly 1 to a softened state; and molding the elastic carrying mat 3 by fluid pressure Elastic expansion in the cavity 2; by setting the elastic coefficient of each position of the elastic carrying pad 3, controlling the thinning rate of each position of the elastic carrying point 3 after stopping the expansion in the molding cavity 2; using the sheet assembly 1 passive Following the deformation of the elastic carrying pad 3, each position of the sheet assembly 1 corresponds to each position of the elastic carrying pad 3 to produce the same thinning rate; the thinning of each position by the sheet assembly 1 is stretched. Accumulating amount, finally forming an integrated bag multi-layer assembly 7 having a pocket cavity in the molding cavity 2;
- thermoplastic sheet A filler for preventing interlayer adhesion of the thermoplastic sheet is added between adjacent thermoplastic sheets.
- the pocket cavity refers to a three-dimensional cavity for holding an article in the structure of the bag.
- Fluid pressure means air pressure or hydraulic pressure.
- the molding cavity means that the sheet assembly forms an integrated bag multi-layer assembly in the molding cavity according to the shape of the integrated bag multi-layer assembly.
- the thinning rate refers to the thickness change and the decrease speed.
- the thinning stretch means that the sheet assembly is stretched by the elastic carrying pad, the total volume of each position is not changed, the thickness is thinned, and the surface area is increased; the thinning amount is referred to as thinning The resulting increase in surface area.
- the setting of the elastic modulus of each position of the elastic carrying pad can be achieved by the following two methods.
- the elastic carrying mat itself should have the following properties:
- the shape variable of the sheet assembly is within the elastic deformation capability of the elastic carrying pad.
- the elastic carrying pad can be selected from silica gel, modified high elastic temperature resistant rubber and the like.
- the product parameters must be set before the two productions, and the thinning of each position in the process of forming the sheet assembly into an integrated bag multi-layer assembly can be mathematically calculated.
- the elastic modulus of each position of the elastic carrying pad can be roughly or accurately calculated through prior art knowledge such as elastic mechanics, calculus or computer simulation software.
- the molding method of the embodiment has a similar structure to the conventional vacuum blistering process, but the conventional vacuum blistering process is difficult to precisely control the thickness uniformity of the molded case; this embodiment has the elastic carrying pad and is active. By controlling the thinning rate of each position of the sheet assembly during the molding process, it is possible to accurately control the thickness uniformity of the integrated bag multi-layer assembly.
- the filler between adjacent thermoplastic sheets prevents the thermoplastic sheet from being bonded by heat and softening, and on the other hand, it occupies a space between the thermoplastic sheets. Eliminate air between thermoplastic sheets as much as possible.
- thermoplastic sheet itself is planar, and the thermoplastic sheet can be obtained by a blown film method or a calendering process. Before the stacking of the thermoplastic sheet or during the stacking process, a filler is added to prevent the filler from being bonded. Solids such as fluororesin powder, talc powder, liquid powder, etc., may also be liquid or paste-like release agents, and those skilled in the art can select according to the material and use scene of the integrated plastic bag itself. In the absence of fillers, the softening temperature of the thermoplastic sheet is strictly controlled to soften it without sticking to the layers; the choice of temperature can be obtained by multiple measurements.
- the thickness uniformity of the integrated bag multi-layer assembly 7 can be adjusted by adjusting the elastic modulus of each position of the elastic carrying pad.
- the sheet assembly can be obtained by co-wound a single roll 8 into a multi-layer roll 9; the filling can be added after passing through the filling liquid pool 10.
- the sheet assembly can be rolled to press the air between the thermoplastic sheets and maintain the sealed state between the thermoplastic sheets.
- the filler is a liquid
- the air between the layered thermoplastic sheets is almost exhausted, so that during the vacuum blistering process, the interlayer displacement is not caused by the expansion of the bubbles, and the thickness is not uniform.
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Abstract
一种一体式袋多层组合体(7)的生产方法，涉及袋体生产工艺方法技术领域。它以热塑性塑料片材为原材料，将多层热塑性塑料片材层层堆积，在相邻热塑性塑料片材之间，加入防止热塑性塑料片材发生层间粘接的填充物；消除塑料片材层间的空气；然后对多层热塑性塑料片材层叠而成的片材组合体(1)进行同步携带式热成型，使面状的片材组合体(1)成型为具有袋腔体的一体式袋多层组合体(7)。该方法能够生产出一体式袋多层组合体(7)，并且生产袋的过程中同时实现了多层袋的层层套结，生产一体式袋多层组合体(7)的效率高，质量好。
Description
本发明涉及袋体生产方法技术领域。
一体式袋，是指通体为一体式结构的袋；其不是由平面状或者管状塑料膜经过压接粘合获得的。一体式袋组合体，是指由多层一体式袋层层套结而成的组合袋体。在使用时，构成一体式袋组合体的一体式袋体可以由内到外层层取出。构成一体式袋组合体的多层一体式袋，由内到外直径逐层递增，且递增量使得每相邻的两层一体式袋能够相对整齐的贴合。每相邻的两层一体式袋之间加有填充物，填充物能够防止每相邻的两层一体式袋粘接。
现有技术中，比如中国实用新型专201720791280.1公开的一种方便使用的多层结构一次性环保垃圾袋，采用了套层垃圾袋的技术方案，其垃圾袋从最内层开始使用，每用完一层取出即可，剩余的垃圾袋继续在垃圾桶内接着使用，不必反复套袋，使用非常方便。但是其使用上也存在一定的问题，而这些问题采用一体式袋组合体结构则能够解决。
201720791280.1-《一种方便使用的多层结构一次性环保垃圾袋》的垃圾袋仍然为传统的粘接垃圾袋，不是一体式结构，仍然是由传统的制袋工艺生产的。传统制袋方法，均是通过平面或管状塑料膜的压接构成，其制造的袋体不是一体结构，压接边缘不平滑，在多层套结时，容易出现褶皱和间隙；另一方面，传统制袋流水线制造的袋子，尺寸是固定的，多层套结时，无法精准实现每层袋体的直径差，直径差也会造成褶皱和间隙的出现；再一方面，传统制袋方法生产的袋子，需要层层装配获取多层袋体，装配过程中不但复杂还容易产生褶皱和间隙。褶皱的层层累积使得放入垃圾桶后内表面形状规则度降低，一方面会减小垃圾桶的使用容积，另一方面在褶皱处容易出现破损。
由于一体式袋自身没有粘接边缘，通体平滑，故多层套结时，层层袋体之间，能够做到层层紧密贴合，没有褶皱，所以一体式袋组合体作为垃圾袋使用时，相比传统的多层塑料袋具有很大的优势。
目前一体式袋组合体还不是现有的技术产品，其仅存于本背景技术中所提到的技术指标上。而且一体式袋组合体无法通过吹膜、压延、流延、压接等传统制袋工艺生产。目前现有技术中还没有对应的生产方法生产一体式袋组合体。
发明内容
本发明所要解决的技术问题，是针对上述存在的技术不足，提供一种一体式袋多层组合体的生产方法。
本发明采用的技术方案是：以热塑性塑料片材为原材料，将多层热塑性塑料片材层层堆积，消除塑料片材层间的空气；然后对多层热塑性塑料片材层叠而成的片材组合体进行同步携带式热成型，使面状的片材组合体成型为具有袋腔体的一体式袋多层组合体；
同步携带式热成型，包括：将片材组合体与弹性携带垫通过流体压力压紧贴合；将片材组合体加热至软化状态；通过流体压力，使弹性携带垫在成型腔体内弹性膨胀；通过设定弹性携带垫每处位置的弹性系数，控制弹性携带在成型腔体内停止膨胀后每处位置的变薄率；利用片材组合体被动跟随弹性携带垫形变，使片材组合体的每处位置一一对应着弹性携带垫的每处位置产生同样的减薄率；通过片材组合体每处位置的变薄拉伸量累积，最终在成型腔体内成型出具有袋腔体的一体式袋多层组合体。
在热成型之前，在相邻热塑性塑料片材之间，加入防止热塑性塑料片材发生层间粘接的填充物。
本发明与传统制袋方法相比：1、能够生产出一体式袋多层组合体。2、生产袋的过程中同时伴随了多层袋的层层套结。3、生产一体式袋多层组合体的效率高，质量好。
图1为本发明的同步携带式热成型的示意图；
图2为片材卷绕装置结构示意图
图中，1、片材组合体；2、成型腔体；3、弹性携带垫；4、流体加压装置；5、加热装置；6、同步组合体；7、一体式塑料袋多层组合体；8、单卷；9、多层卷；10、填充物液池。
下面结合附图和具体实施方式对本发明作进一步详细的说明。
图1中，同步组合体6，是指弹性携带垫3与片材组合体1压紧贴合后的一种组合。
一种一体式袋多层组合体的生产方法，以热塑性塑料片材为原材料，将多层热塑性塑料片材层层堆积，消除塑料片材层间的空气；然后对多层热塑性塑料片材层叠而成的片材组合体1进行同步携带式热成型，使面状的片材组合体1成型为具有袋腔体的一体式袋多层组合体7；
同步携带式热成型，包括：将片材组合体1与弹性携带垫3通过流体压力进行压紧贴合；将片材组合体1加热至软化状态；通过流体压力，使弹性携带垫3在成型腔体2内弹性膨胀；通过设定弹性携带垫3每处位置的弹性系数，控制弹性携带点3在成型腔体2内停止膨胀后每处位置的变薄率；利用片材组合体1被动跟随弹性携带垫3形变，使片材组合体1的每处位置一一对应着弹性携带垫3的每处位置产生同样的减薄率；通过片材组合体1每处位置的变薄拉伸量累积，最终在成型腔体2内成型出具有袋腔体的一体式袋多层组合体7；
在相邻热塑性塑料片材之间，加入防止热塑性塑料片材发生层间粘接的填充物。
袋腔体是指：袋子的结构中，用于盛放物品的立体的腔体。
流体压力是指：气压或液压。
成型腔体是指：依据一体式袋多层组合体的形状，对应设置的阴模，片材组合体在成型腔体内形成一体式袋多层组合体。
变薄率是指：厚度变化，减小的速度。
变薄拉伸量是指：片材组合体被弹性携带垫携带着拉伸形变，每处位置的总体积没有变，厚度减薄，而表面积增大；变薄拉伸量就是指因为变薄导致的表面积增大量。
弹性携带垫每个位置的弹性系数的设定，可以通过下述两种方式实现。
1、实现弹性携带垫每个位置的弹性系数的设定，通过每个位置的材质的弹性模量设定。
2、实现弹性携带垫每个位置的弹性系数的设定，通过每个位置的材质的厚度设定。
弹性携带垫，本身应该具有的性质：
1、耐热性，其能够承受组合体加热至软化状态的温度。
2、具有较强的弹性形变能力。片材组合体成型的形变量，在其弹性携带垫的弹性形变能力之内。
综上两条，弹性携带垫可以选择硅胶、经过改良的高弹性耐温橡胶等。
通过一体式袋多层组合体的形状和厚度均匀度这两个生产前要设定产品参数，可以数学计算出片材组合体成型为一体式袋多层组合体过程中每处位置的减薄拉伸量，根据此减薄拉伸量，就能通过弹性力学、微积分或者计算机仿真软件等现有技术知识，粗略或者精确计算出弹性携带垫每处位置的弹性系数。
对于传统的垃圾袋购物袋，以及本实施例中的一体式袋多层组合体而言，袋体的厚度均匀度越高，质量就越好，越节省材料。本实施例的成型方法，与传统的真空吸塑工艺有类似结构，但是传统的真空吸塑工艺很难精确控制成型后壳体的厚度均匀度；本实施例正是有了弹性携带垫，主动调控成型过程中片材组合体每处位置的减薄率，才实现了够精确控制一体式袋多层组合体成型厚度均匀度。
对于片材组合体而言，相邻热塑性塑料片材之间的填充物，一方面要防止热塑性塑料片材受热软化后粘接，另一方面，还能占据热塑性塑料片材之间的空间，尽可能消除热塑性塑料片材之间的空气。
热塑性塑料片材本身为平面状，热塑性塑料片材可以由吹膜法或者压延法等工艺获得，热塑性塑料片材叠放前或者叠放过程中，加入填充物，防止粘接的填充物可以选择氟树 脂粉末、滑石粉、液体粉末等固体类，还可以是液体或膏状的离型剂类，本领域技术人员可以根据一体式塑料袋本身的材料以及使用场景去选定。对于没有填充物的情况，要严格控制热塑性塑料片材的软化温度，使之软化但不至于层间粘粘；温度的选择可以通过多次测量实验获得。通过降低加热温度的方式，可以防止片材层间粘附；值得注意的是，由于片材成型温度降低，导致片材在形变时，弹性携带垫的受到的反作用力就会增强，在计算弹性携带垫的每处位置的弹性系数时，需要将成型温度，片材材质，层数作为变量考虑进去。
在成型原则上，只要热塑性塑料片材的断裂拉伸率大于或等于弹性携带垫的成型后形变量，并且流体压力作用下，弹性携带垫对片材组合体的摩擦力能够使弹性携带垫和片材组合体保持相对静止，就能够成型出具有袋腔体的一体式袋多层组合体7。在能成型的基础上，调整弹性携带垫的每处位置的弹性系数，就能调整一体式袋多层组合体7的厚度均匀度。
如图2所示，片材组合体可以通过单卷8共同缠绕成多层卷9的方式获得；填充物可以通过填充物液池10后加入。加入填充物后，热塑性塑料片材叠放成片材组合体时，可以对片材组合体进行滚压，将热塑性塑料片材之间的空气压出，并保持热塑性塑料片材间的密封状态。在填充物为液体的情况下，也可以利用液体自行填充，将空气排出，不再需要滚压。最终形成的片材组合体，层层热塑性塑料片材之间空气近乎排尽，这样在真空吸塑过程中，不会因为气泡的膨胀而造成层间位移，使厚度不均匀。
Claims (2)
- 一体式袋多层组合体的生产方法，其特征在于：以热塑性塑料片材为原材料，将多层热塑性塑料片材层层堆积，消除塑料片材层间的空气；然后对多层热塑性塑料片材层叠而成的片材组合体进行同步携带式热成型，使面状的片材组合体成型为具有袋腔体的一体式袋多层组合体；同步携带式热成型，包括：将片材组合体与弹性携带垫通过流体压力压紧贴合；将片材组合体加热至软化状态；通过流体压力，使弹性携带垫在成型腔体内弹性膨胀；通过设定弹性携带垫每处位置的弹性系数，控制弹性携带在成型腔体内停止膨胀后每处位置的变薄率；利用片材组合体被动跟随弹性携带垫形变，使片材组合体的每处位置一一对应着弹性携带垫的每处位置产生同样的减薄率；通过片材组合体每处位置的变薄拉伸量累积，最终在成型腔体内成型出具有袋腔体的一体式袋多层组合体。
- 根据权利要求1所述的一体式袋多层组合体的生产方法，其特征在于：在热成型之前，在相邻热塑性塑料片材之间，加入防止热塑性塑料片材发生层间粘接的填充物。
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| CN201910129725.3A CN110450391A (zh) | 2018-05-07 | 2019-02-21 | 一体式袋多层组合体的生产方法 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010064083A1 (en) * | 2008-07-31 | 2010-06-10 | Mei S.R.L. | Procedure and equipment for making glass frames and glass frame obtained therewith |
| CN205257123U (zh) * | 2015-12-23 | 2016-05-25 | 莫迟 | 一种多层垃圾袋 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2010064083A1 (en) * | 2008-07-31 | 2010-06-10 | Mei S.R.L. | Procedure and equipment for making glass frames and glass frame obtained therewith |
| CN205257123U (zh) * | 2015-12-23 | 2016-05-25 | 莫迟 | 一种多层垃圾袋 |
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